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CN115324674B - System for thermal power generating unit variable-frequency condensate pump participates in power grid frequency adjustment - Google Patents

System for thermal power generating unit variable-frequency condensate pump participates in power grid frequency adjustment Download PDF

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Publication number
CN115324674B
CN115324674B CN202210884375.3A CN202210884375A CN115324674B CN 115324674 B CN115324674 B CN 115324674B CN 202210884375 A CN202210884375 A CN 202210884375A CN 115324674 B CN115324674 B CN 115324674B
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CN
China
Prior art keywords
condenser
deaerator
condensate
liquid level
pump
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Application number
CN202210884375.3A
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Chinese (zh)
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CN115324674A (en
Inventor
文立斌
胡弘
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Electric Power Research Institute of Guangxi Power Grid Co Ltd
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Priority to CN202210884375.3A priority Critical patent/CN115324674B/en
Publication of CN115324674A publication Critical patent/CN115324674A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18—Combinations of steam boilers with other apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/30—Automatic feed-control systems responsive to both water level and amount of steam withdrawn or steam pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/34—Applications of valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Supply & Treatment (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)

Abstract

The invention belongs to the technical field of power grid frequency modulation, and particularly relates to a system for a variable-frequency condensate pump of a thermal power generating unit to participate in power grid frequency regulation. According to the invention, the frequency of the power grid is tested in real time through the three-phase power parameter tester, the power of the thermal power unit and the frequency signal of the power grid are sent to the data acquisition and control device, the data acquisition and control device controls the frequency converter according to the power of the thermal power unit, the frequency signal of the power grid and the condensate flow rate which is measured by the condensate flow rate measuring device and enters the low-pressure heater to adjust the rotating speed of the condensate pump, and then the condensate flow rate which enters the low-pressure heater is adjusted, so that the pumping quantity of the low-pressure heater from the low-pressure cylinder is adjusted, and further the mechanical power output by the thermal power unit is changed, and the thermal power unit participates in the frequency adjustment of the power grid. The data acquisition and control device is connected with the frequency converter through a one-out-of-two switching switch; when the switching switch is arranged at 1, the frequency converter is put into operation; when the switching switch is set to 0, the frequency converter is switched out.

Description

System for thermal power generating unit variable-frequency condensate pump participates in power grid frequency adjustment
Technical Field
The invention belongs to the technical field of power grid frequency modulation, and particularly relates to a system for a variable-frequency condensate pump of a thermal power generating unit to participate in power grid frequency regulation.
Background
The electric monitoring bureau in each region of the country successively goes out of the rule of implementation of grid-connected operation management of the power plant and the rule of implementation of auxiliary service management of the grid-connected power plant (two rules for short) in 2008, and the thermal power unit plays the role of the frequency modulation main force of the power grid after being issued and implemented by the two rules. In recent years, new energy sources such as wind power, photovoltaic and the like are subjected to large-scale grid-connected power generation, due to the characteristics of fluctuation, intermittence and randomness of the new energy source power, the fluctuation of the power grid frequency is obvious, the high-pressure door regulating action of a steam turbine is frequent in the process of participating in the power grid frequency regulation of a thermal power unit, the main steam pressure of a boiler is fluctuated and changed in real time, the high-temperature and high-pressure steam turbine, a boiler body and related auxiliary equipment thereof are repeatedly subjected to alternate thermal stress, and the service life loss of the equipment is serious; meanwhile, the thermal power unit has frequency modulation power capacity limiting, so that the problems of lack of adjustable power capacity and the like which can be provided by the thermal power unit are caused under the condition that the frequency modulation capacity requirement is rapidly increased due to new energy grid connection. In order to solve the problem of lack of power capacity regulation of a thermal power generating unit, the published invention application No. CN114400681A discloses a system for participating in power grid frequency regulation of steam turbine extraction. In order to solve the technical problems, the invention provides a system for participating in power grid frequency adjustment of a variable-frequency condensate pump of a thermal power generating unit.
Disclosure of Invention
In order to solve the problems, the invention provides a system for participating in power grid frequency adjustment of a variable-frequency condensate pump of a thermal power generating unit, which comprises the following specific technical scheme:
A system for participating in power grid frequency regulation of a variable-frequency condensate pump of a thermal power generating unit comprises a boiler, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a condenser, a low-pressure heater, a deaerator, a generator stator and a generator rotor; the boiler, the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder are connected in sequence; the condenser is connected with the low-pressure cylinder, and the low-pressure heater is respectively connected with the low-pressure cylinder and the deaerator; the deaerator is connected with the boiler; the generator rotor is connected with the low-pressure cylinder, and the generator stator is connected with the generator rotor;
the system also comprises a data acquisition and control device, a current converter, a three-phase power parameter tester, a voltage converter, a frequency converter, a condensate pump motor, a condensate pump, a shaft seal heater and a condensate flow measuring device;
the condensate pump is connected with the water side of the condenser through a condensate pump water inlet main pipe; the condensate pump is connected with the shaft seal heater through a condensate pump water outlet main pipe, and the shaft seal heater is connected with the low-pressure heater through a low-pressure heater water inlet condensate main pipe; a condensate flow measuring device and a deaerator water level regulating valve are arranged on the low-pressure heater water inlet condensate main pipe; the condensate flow measuring device and the deaerator water level regulating valve are respectively connected with the data acquisition and control device;
The condensate pump boosts the pressure of the condensate in the condenser, then conveys the condensate to flow through the shaft seal heater and the low-pressure heater in sequence, and then enters the deaerator through the condensate main pipe of the oxygen inlet device;
the frequency converter is connected with the condensate pump motor through a cable, and the condensate pump motor is rigidly connected with the condensate pump through a concentric shaft; the frequency converter is connected with the data acquisition and control device;
the current converter and the voltage converter are respectively connected with the generator stator and the three-phase power parameter tester, and the three-phase power parameter tester is connected with the data acquisition and control device;
The current converter and the voltage converter convert the current and the voltage output by the generator stator and then transmit the converted current and the converted voltage to the three-phase power parameter tester, the three-phase power parameter tester converts the voltage and the current signals converted by the current converter and the voltage converter into power signals, the frequency of a power grid is tested in real time, finally the power signals and the frequency signals are transmitted to the data acquisition and control device, the data acquisition and control device controls the frequency converter to regulate the rotating speed of the condensate pump according to the power signals and the condensate flow which are transmitted by the three-phase power parameter tester and are measured by the condensate flow measuring device and enter the low-voltage heater, and then the condensate flow which enters the low-voltage heater is regulated to regulate the extraction amount of the low-voltage heater from the low-voltage cylinder, so that the mechanical power output by the thermal power unit is changed, and the thermal power unit participates in the frequency regulation of the power grid is realized;
The data acquisition and control device is connected with the frequency converter through a one-out-of-two switching switch; when the switching switch is arranged at 1, the frequency converter is put into operation; when the switching switch is set to 0, the frequency converter is switched out.
Preferably, the condensate flow measurement device comprises a nozzle, a flow tester, and a differential pressure sampling tube.
Preferably, the condenser is provided with a condenser liquid level meter; the condenser liquid level instrument is connected with the data acquisition and control device and is used for measuring liquid level signals of the condenser and transmitting the measured liquid level signals to the data acquisition and control device.
Preferably, the water level meter further comprises a normal-temperature water tank, the normal-temperature water tank is connected with the condenser through a condenser water supplementing bypass pipe, a condenser water supplementing bypass adjusting valve is arranged on the condenser water supplementing bypass pipe, the condenser water supplementing bypass adjusting valve is connected with the data acquisition and control device, when the liquid level of the condenser measured by the condenser liquid level meter is lower than a set condenser liquid level lower limit value L nd, the data acquisition and control device adjusts the opening of the condenser water supplementing bypass adjusting valve, normal-temperature working medium condensed water is supplemented to the condenser through the condenser water supplementing bypass pipe by the normal-temperature water tank until the test value of the condenser liquid level meter is higher than the condenser liquid level lower limit value L nd.
Preferably, the normal temperature water tank is also connected with a condenser through a condenser water supplementing main pipe, and an outlet electric valve of the condenser water supplementing pump and the condenser water supplementing pump are arranged on the condenser water supplementing main pipe; the electric valve at the outlet of the condenser water supplementing pump and the condenser water supplementing pump are respectively connected with the data acquisition and control device;
When the liquid level of the condenser measured by the condenser liquid level meter is lower than a set lower limit value L nd of the liquid level of the condenser and the data acquisition and control device controls the condenser water supplementing bypass regulating valve to be fully opened and can not lift the liquid level of the condenser in a set time, the data acquisition and control device controls the opening of the condenser water supplementing pump outlet electric valve and the condenser water supplementing pump, and meanwhile, the condenser water supplementing bypass regulating valve is fully Guan Ningqi, the normal-temperature water tank supplements normal-temperature working medium condensed water to the condenser through the condenser water supplementing main pipe, the test value of the condenser liquid level meter is higher than the lower limit value L nd of the liquid level of the condenser, and the data acquisition and control device controls the stopping of the operation of the condenser water supplementing pump and the closing of the condenser water supplementing pump outlet electric valve.
Preferably, the low-pressure heater water inlet condensate mother pipe is connected with the normal-temperature water tank through a condenser condensate recovery pipe, a condenser condensate recovery regulating valve is arranged on the condenser condensate recovery pipe, the condenser condensate recovery regulating valve is connected with a data acquisition and control device, when the test value of the condenser liquid level meter is higher than the upper limit value L ng of the condenser liquid level, the data acquisition and control device opens the condenser condensate recovery regulating valve, condensed water of the condenser enters the normal-temperature water tank through the condenser condensate recovery pipe, and when the test value of the condenser liquid level meter is lower than the upper limit value L ng of the condenser liquid level, the data acquisition and control device controls the condenser condensate recovery regulating valve to be closed.
Preferably, the deaerator is provided with a deaerator liquid level meter, and the deaerator liquid level meter and the data acquisition and control device are used for measuring the liquid level of the deaerator and transmitting the measured liquid level of the deaerator to the data acquisition and control device;
The medium pressure cylinder is connected with the deaerator through a medium pressure cylinder steam exhaust and extraction pipe check valve and a deaerator steam inlet pipe, and a deaerator steam inlet regulating valve is arranged on the deaerator steam inlet pipe.
Preferably, the device also comprises a high-temperature water tank, wherein the medium-pressure cylinder is connected with the steam side of the high-temperature water tank through a medium-pressure cylinder steam-exhaust steam-extraction main pipe and a high-temperature water tank steam inlet pipe; the water side of the high-temperature water tank is connected with the water side of the deaerator through a deaerator water supplementing bypass pipe, and a deaerator water supplementing bypass regulating valve is arranged on the deaerator water supplementing bypass pipe; when the measured value of the deaerator liquid level meter is lower than the deaerator liquid level lower limit value L cd, the data acquisition and control device starts the deaerator water supplementing bypass regulating valve, the high-temperature water tank supplements high-temperature working medium water for the deaerator through the deaerator water supplementing bypass pipe until the measured value of the deaerator liquid level meter is higher than the deaerator liquid level lower limit value L cd, and then the data acquisition and control device controls the deaerator water supplementing bypass regulating valve to be closed.
Preferably, the high-temperature water tank is also connected with a deaerator through a deaerator water supplementing main pipe, and an electric stop valve at the outlet of the deaerator water supplementing pump is arranged on the deaerator water supplementing main pipe; the oxygen device water supplementing pump and the oxygen device water supplementing pump outlet electric stop valve are respectively connected with the data acquisition and control device, when the measured value of the oxygen device liquid level meter is lower than the oxygen device liquid level lower limit value L cd and the oxygen device water supplementing bypass regulating valve is fully opened to supplement high-temperature working medium water to the oxygen device, the data acquisition and control device controls to open the oxygen device water supplementing pump and the oxygen device water supplementing pump outlet electric stop valve within a set time, and simultaneously closes the oxygen device water supplementing bypass regulating valve, the high-temperature working medium water is supplemented to the oxygen device through the oxygen device water supplementing main pipe until the data acquisition and control device controls to stop the operation of the oxygen device water supplementing pump and close the oxygen device water supplementing pump outlet electric stop valve after the measured value of the oxygen device liquid level meter is higher than the oxygen device liquid level lower limit value L cd.
Preferably, the deaerator is connected with a water feed pump pre-pump through a water feed pump pre-pump inlet pipe, a water outlet of the water feed pump pre-pump is connected with a high-temperature water tank through a deaerator working medium recovery pipe, a deaerator working medium recovery regulating valve is arranged on the deaerator working medium recovery pipe, and the water feed pump pre-pump and the deaerator working medium recovery regulating valve are connected with a data acquisition and control device;
When the measured value of the deaerator liquid level meter is higher than the deaerator liquid level upper limit value L cg, the data acquisition and control device controls the feed pump pre-pump and the deaerator working medium recovery regulating valve to be opened, the working medium of the deaerator enters the high-temperature water tank through the deaerator working medium recovery pipe until the measured value of the deaerator liquid level meter is lower than the deaerator liquid level upper limit value L cg, and the data acquisition and control device controls the feed pump pre-pump and the deaerator working medium recovery regulating valve to be closed.
The beneficial effects of the invention are as follows: the invention provides a system for enabling a variable-frequency condensate pump of a thermal power unit to participate in power grid frequency adjustment, which is characterized in that the frequency of a power grid is tested in real time through a three-phase power parameter tester, power of the thermal power unit and frequency signals of the power grid are sent to a data acquisition and control device, the data acquisition and control device controls a frequency converter to adjust the rotating speed of the condensate pump according to the power of the thermal power unit, the frequency signals of the power grid and condensate flow entering a low-pressure heater, which are measured by a condensate flow measuring device, so as to adjust the condensate flow entering the low-pressure heater, thereby adjusting the extraction amount of the low-pressure heater from a low-pressure cylinder, further enabling the mechanical power output by the thermal power unit to change, and further realizing that the thermal power unit participates in power grid frequency adjustment.
The data acquisition and control device is connected with the frequency converter through a one-out-of-two switching switch; when the switching switch is arranged at 1, the frequency converter is put into operation; when the switching switch is arranged at 0, the frequency converter is switched out, so that the thermal power generating unit can participate in adjusting the frequency of the power grid according to the requirement.
The invention can promote the thermal power unit to participate in the frequency modulation working power capacity of the power grid, solve the hidden trouble of fatigue damage accident of the steam turbine, the boiler body and related auxiliary equipment caused by frequent action of the high-pressure valve of the steam turbine caused by the frequency modulation mode of the traditional thermal power unit, promote the stable operation of the power grid frequency after the large-scale power generation and grid connection of new energy power such as wind power, photovoltaic and the like, and assist the construction of a novel power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is a control schematic diagram of the present invention for regulating grid frequency;
Wherein, the condensate pump water inlet main pipe 1, the frequency converter 2, the condensate pump motor 3, the condensate pump 4, the condensate pump outlet check valve 5, the condensate pump water outlet main pipe 6, the shaft seal heater 7, the low pressure heater water inlet condensate main pipe 8, the nozzle 9, the flow tester 10, the differential pressure sampling pipe 11, the deaerator water level regulating valve 12, the IV low pressure heater steam inlet check valve 13, the IV low pressure heater steam inlet stop valve 14, the IV low pressure heater steam inlet regulating valve 15, the IV low pressure heater steam inlet pipe 16, the condensate main pipe 17 between III-IV low pressure heater, the IV low pressure heater 18, the III low pressure heater drain pipe 19, A third low-pressure heater steam inlet check valve 20, a third low-pressure heater steam inlet stop valve 21, a third low-pressure heater steam inlet regulating valve 22, a third low-pressure heater steam inlet pipe 23, a condensed water main pipe 24 between II-third low-pressure heaters, a third low-pressure heater 25, a second low-pressure heater drain pipe 26, a second low-pressure heater steam inlet check valve 27, a second low-pressure heater steam inlet stop valve 28, a condenser 29, a condenser liquid level meter 30, a second low-pressure heater steam inlet regulating valve 31, a second low-pressure heater steam inlet pipe 32, a condensed water main pipe 33 between I-II low-pressure heaters, a second low-pressure heater 34, The low pressure heater drain pipe 35, the low pressure heater steam inlet check valve 36, the low pressure heater steam inlet stop valve 37, the low pressure heater steam inlet regulating valve 38, the low pressure heater steam inlet pipe 39, the oxygen feeder condensate header 40, the low pressure heater 41, the deaerator working medium recovery regulating valve 42, the deaerator working medium recovery pipe 43, the high temperature water tank liquid level meter 44, the deaerator water supplementing pump 45, the deaerator water supplementing main pipe 46, the deaerator water supplementing pump outlet electric stop valve 47, the deaerator liquid level meter 48, the feed pump front pump inlet pipe 49, the medium pressure cylinder steam extraction header 50, the medium pressure cylinder steam extraction pipe check valve 51, High temperature water tank 52, high temperature water tank steam inlet pipe 53, high temperature water tank steam inlet regulating valve 54, deaerator water supplementing bypass pipe 55, deaerator water supplementing bypass regulating valve 56, deaerator steam inlet pipe 57, deaerator 58, deaerator steam inlet regulating valve 59, feed pump pre-pump 60, feed pump pre-pump outlet pipe 61, feed pump 62, feed pump outlet check valve 63, boiler feed water regulating valve 64, feed water main pipe 65, boiler 66, reheat main steam pipe 67, main steam pipe 68, high pressure cylinder steam exhaust pipe 69, high pressure cylinder steam exhaust check valve 70, high pressure regulating valve 71, high pressure cylinder 72, medium pressure regulating valve 73, medium pressure cylinder 74, The device comprises a medium-low pressure cylinder communication pipe 75, a low pressure cylinder 76, a current converter 77, a three-phase electric power parameter tester 78, a voltage converter 79, a generator stator 80, a generator rotor 81, a water conversion regulating valve 82, a condenser water supplementing bypass pipe 83, a condenser water supplementing bypass regulating valve 84, a condenser water supplementing pump outlet electric valve 85, a condenser water supplementing pump 86, a condenser water supplementing main pipe 87, a normal-temperature water tank 88, a normal-temperature water tank liquid level instrument 89, a condenser condensed water recovery pipe 90, a condenser condensed water recovery regulating valve 91, an IV low-pressure heater drain pipe 92 and a data acquisition and control module 93.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1, the embodiment of the invention provides a system for participating in power grid frequency adjustment of a variable-frequency condensate pump of a thermal power generating unit, wherein the thermal power generating unit comprises a boiler 66, a high-pressure cylinder 72, a medium-pressure cylinder 74, a low-pressure cylinder 76, a condenser 29, a low-pressure heater, a deaerator 58, a generator stator 80 and a generator rotor 81. The boiler 66 is connected to a high pressure cylinder 72 through a main steam pipe 68, the main steam pipe 68 is provided with a high pressure regulating valve 71, the high pressure cylinder 72 is connected to a medium pressure cylinder 74, the boiler 66 is connected to the medium pressure cylinder 74 through a reheat main steam pipe 67, the reheat main steam pipe 67 is provided with a medium pressure regulating valve 73, and the medium pressure cylinder 74 is connected to a low pressure cylinder 76 through a medium and low pressure cylinder communication pipe 75. The high-pressure cylinder 72 is connected to the boiler 66 through a high-pressure cylinder exhaust pipe 69, and a high-pressure cylinder exhaust check valve 70 is provided on the high-pressure cylinder exhaust pipe 69.
The low-pressure heater is respectively connected with the low-pressure cylinder 76 and the deaerator 58; the deaerator 58 is connected to a boiler 66; the generator rotor 81 is connected to the low pressure cylinder 76, and the generator stator 80 is connected to the generator rotor 81;
The system also comprises a data acquisition and control device 93, a current converter 77, a three-phase power parameter tester 78, a voltage converter 79, a frequency converter 2, a condensate pump motor 3, a condensate pump 4, a shaft seal heater 7 and a condensate flow measuring device;
The condensate pump 4 is connected with the water side of the condenser 29 through a condensate pump water inlet main pipe 1; the condensate pump 4 is connected with the shaft seal heater 7 through a condensate pump water outlet female pipe 6, and the condensate pump water outlet female pipe 6 is also provided with a condensate pump outlet check valve 5; the shaft seal heater 7 is connected with the low-pressure heater through a low-pressure heater water inlet condensation water mother pipe 8; a condensate flow measuring device and a deaerator water level regulating valve 12 are arranged on the low-pressure heater water inlet condensate header 8; the condensate flow measuring device and the deaerator water level regulating valve 12 are respectively connected with the data acquisition and control device 93;
the condensate pump 4 boosts the pressure of the condensate in the condenser 29, then conveys the condensate to flow through the shaft seal heater 7 and the low-pressure heater in sequence, and then enters the deaerator 58 through the condensate main pipe 40 of the oxygen inlet device;
The frequency converter 2 is connected with the condensate pump motor 3 through a cable, and the condensate pump motor 3 is rigidly connected with the condensate pump 4 through a concentric shaft; the frequency converter 2 is connected with a data acquisition and control device 93;
the current converter 77 and the voltage converter 79 are respectively connected with the generator stator 80 and the three-phase power parameter tester 78, and the three-phase power parameter tester 78 is connected with the data acquisition and control device 93;
The current converter 77 and the voltage converter 79 convert the current and the voltage output by the generator stator 80 and then transmit the converted current and the converted voltage to the three-phase power parameter tester 78, the three-phase power parameter tester 78 converts the voltage and the converted current signals converted by the current converter 77 and the converted voltage converter 79 into power signals, the frequency of a power grid is tested in real time, finally the power signals and the frequency signals are transmitted to the data acquisition and control device 93, the data acquisition and control device 93 controls the frequency converter 2 to regulate the rotating speed of the condensate pump 4 according to the power signals and the condensate flow which are transmitted by the three-phase power parameter tester 78 and enter the low-pressure heater, and then regulates the condensate flow which enters the low-pressure heater, so as to regulate the pumping quantity of the low-pressure heater from the low-pressure cylinder, and further enable the mechanical power output by the thermal power generating unit to change, and the thermal generating unit participates in the frequency regulation of the power grid; after the frequency converter 2 receives the instruction of the data acquisition and control module 93, the condensate pump motor 3 is controlled to run at the corresponding rotation speed, the rotation speed of the condensate pump 4 is synchronously changed, and the condensate flow at the outlet of the condensate pump 4 is changed due to different rotation speeds.
The data acquisition and control device 93 is connected with the frequency converter 2 through a one-out-of-two switching switch; when the switching switch is arranged at 1, the frequency converter 2 is put into operation; when the on-off switch is set to 0, the frequency converter 2 is turned off.
The condensate flow measuring device comprises a nozzle 9, a flow tester 10 and a differential pressure sampling tube 11. The nozzle 9 adopts an ASME long-diameter nozzle, the material is 1Cr13, and the adopted nozzle has the advantages of small throttling and high measurement precision, and the precision reaches 0.1%; the flow tester 10 adopts EJA or Rosemoun series flow differential pressure transmitters, and the accuracy is 0.1%; the differential pressure sampling tube 11 is horizontally arranged, so that the error caused by the height difference of the sampling tubes arranged on two sides of the flow tester 10 in the vertical direction is reduced.
The condenser 29 is provided with a condenser liquid level meter 30; the condenser liquid level meter 30 is connected with the data acquisition and control device 93, and is used for measuring a liquid level signal of the condenser 29 and transmitting the measured liquid level signal to the data acquisition and control device 93.
The system of the invention further comprises a normal temperature water tank 88, the normal temperature water tank 88 is connected with the condenser 29 through a condenser water supplementing bypass pipe 83, a condenser water supplementing bypass adjusting valve 84 is arranged on the condenser water supplementing bypass pipe 83, the condenser water supplementing bypass adjusting valve 84 is connected with a data acquisition and control device 93, when the liquid level of the condenser 29 measured by the condenser liquid level meter 30 is lower than a set condenser liquid level lower limit value L nd, the data acquisition and control device 93 adjusts the opening degree of the condenser water supplementing bypass adjusting valve 84, normal temperature working medium condensed water is supplemented to the condenser 29 through the condenser water supplementing bypass pipe 83 by the normal temperature water tank 88 until the test value of the condenser liquid level meter 30 is higher than the condenser liquid level lower limit value L nd.
The normal-temperature water tank 88 is also connected with the condenser 29 through a condenser water supplementing main pipe 87, and the condenser water supplementing main pipe 87 is provided with a condenser water supplementing pump outlet electric valve 85 and a condenser water supplementing pump 86; the condenser water supplementing pump outlet electric valve 85 and the condenser water supplementing pump 86 are respectively connected with the data acquisition and control device 93;
When the liquid level of the condenser 29 measured by the condenser liquid level meter 30 is lower than the set lower limit value L nd of the condenser liquid level and the data acquisition and control device 93 controls the condenser water supplementing bypass regulating valve 84 to be fully opened and can not lift the liquid level of the condenser 29 within the set time, the data acquisition and control device 93 controls the opening of the condenser water supplementing pump outlet electric valve 85 and the condenser water supplementing pump 86, and simultaneously the whole Guan Ningqi water supplementing bypass regulating valve 84, the normal temperature water tank 88 supplements normal temperature working medium condensed water for the condenser 29 through the condenser water supplementing main pipe 87, the test value of the condenser liquid level meter 30 is higher than the lower limit value L nd of the condenser liquid level, and the data acquisition and control device 93 controls the stopping of the operation of the condenser water supplementing pump 86 and the closing of the condenser water supplementing pump outlet electric valve 85.
The low-pressure heater water inlet condensate mother pipe 8 is connected with the normal-temperature water tank 88 through the condenser condensate recovery pipe 90, a condenser condensate recovery regulating valve 91 is arranged on the condenser condensate recovery pipe 90, the condenser condensate recovery regulating valve 91 is connected with a data acquisition and control device 93, when the test value of the condenser liquid level meter 30 is higher than the upper limit value L ng of the condenser liquid level, the data acquisition and control device 93 opens the condenser condensate recovery regulating valve 91, condensate of the condenser 29 enters the normal-temperature water tank 88 through the condenser condensate recovery pipe 90, and when the test value of the condenser liquid level meter 30 is lower than the upper limit value L ng of the condenser liquid level, the data acquisition and control device 93 controls the condenser condensate recovery regulating valve 91 to be closed. Wherein, condenser condensate recovery pipe 90 is connected with low pressure heater water inlet condensate main pipe 8 and is located between shaft seal heater 7 and flow measuring device to before deaerator water level regulating valve 12.
The normal temperature water tank 88 is provided with a normal temperature water tank level meter 89 and a water change regulating valve 82, condensed water of the normal temperature water tank 88 comes from the water change workshop, and when the liquid level value measured by the normal temperature water tank level meter 89 is lower than the lower limit value of the set normal temperature water tank liquid level, the water change regulating valve 82 is opened to supplement.
The deaerator 58 is provided with a deaerator liquid level meter 48, and the deaerator liquid level meter 48 and a data acquisition and control device 93 are used for measuring the liquid level of the deaerator 58 and transmitting the measured liquid level of the deaerator 58 to the data acquisition and control device 93;
the medium pressure cylinder 74 is connected with the deaerator 58 through the medium pressure cylinder exhaust steam extraction pipe check valve 51 and the deaerator steam inlet pipe 57, and the deaerator steam inlet pipe 57 is provided with a deaerator steam inlet regulating valve 59.
The system of the invention also comprises a high-temperature water tank 52, wherein the medium pressure cylinder 74 is connected with the steam side of the high-temperature water tank 52 through a medium pressure cylinder steam exhaust and extraction main pipe 50 and a high-temperature water tank steam inlet pipe 53; the water side of the high-temperature water tank 52 is connected with the water side of a deaerator 58 through a deaerator water supplementing bypass pipe 55, and a deaerator water supplementing bypass regulating valve 56 is arranged on the deaerator water supplementing bypass pipe 55; when the measured value of the deaerator liquid level meter 48 is lower than the deaerator liquid level lower limit value L cd, the data acquisition and control device 93 opens the deaerator water supplementing bypass regulating valve 56, and the high-temperature water tank 52 supplements high-temperature working medium water for the deaerator 58 through the deaerator water supplementing bypass pipe 55 until the measured value of the deaerator liquid level meter 48 is higher than the deaerator liquid level lower limit value L cd, and the data acquisition and control device 93 controls the deaerator water supplementing bypass regulating valve 56 to be closed. The working medium water of the high-temperature water tank 52 is mixed with steam flowing through the high-temperature water tank steam inlet pipe 53 by opening the high-temperature water tank steam inlet regulating valve 54 to heat and raise the temperature, the steam inlet end of the high-temperature water tank steam inlet pipe 53 is connected with the medium-pressure cylinder steam exhaust and extraction main pipe 50, the medium-pressure cylinder steam exhaust and extraction main pipe 50 is connected with the last stage blade steam exhaust and extraction port of the medium-pressure cylinder 74, and the medium-pressure cylinder steam exhaust and extraction main pipe 50 is provided with the medium-pressure cylinder steam exhaust and extraction main pipe check valve 51.
The high-temperature water tank 52 is also connected with a deaerator 58 through a deaerator water supplementing main pipe 46, and the deaerator water supplementing main pipe 46 is provided with a deaerator water supplementing pump 45 and an electric stop valve 47 at the outlet of the deaerator water supplementing pump; the oxygen device water supplementing pump 45 and the oxygen device water supplementing pump outlet electric stop valve 47 are respectively connected with the data acquisition and control device 93, when the measured value of the oxygen device liquid level meter 48 is lower than the oxygen device liquid level lower limit value L cd and the fully-opened oxygen device water supplementing bypass regulating valve 56 is used for supplementing high-temperature working medium water to the oxygen device 58, the data acquisition and control device 93 is used for controlling to start the oxygen device water supplementing pump 45 and the oxygen device water supplementing pump outlet electric stop valve 47 and simultaneously closing the oxygen device water supplementing bypass regulating valve 56, the high-temperature water tank 52 is used for supplementing high-temperature working medium water to the oxygen device 58 through the oxygen device water supplementing main pipe 46 until the data acquisition and control device 93 is used for controlling to stop the operation of the oxygen device water supplementing pump 45 and closing the oxygen device water supplementing pump outlet electric stop valve 47 after the measured value of the oxygen device liquid level meter 48 is higher than the oxygen device liquid level lower limit value L cd. The time set by the invention can be selected to be 30s.
The deaerator 58 is connected with the feed pump pre-pump 60 through a feed pump pre-pump inlet pipe 49, a water outlet of the feed pump pre-pump 60 is connected with the high-temperature water tank 52 through a deaerator working medium recovery pipe 43, a deaerator working medium recovery regulating valve 42 is arranged on the deaerator working medium recovery pipe 43, and the feed pump pre-pump 60 and the deaerator working medium recovery regulating valve 42 are connected with a data acquisition and control device 93;
When the measured value of the deaerator liquid level meter 48 is higher than the deaerator liquid level upper limit value L cg, the data acquisition and control device 93 controls the feed pump pre-pump 60 and the deaerator working medium recovery regulating valve 42 to be opened, the working medium of the deaerator 58 enters the high-temperature water tank 52 through the deaerator working medium recovery pipe 43 until the measured value of the deaerator liquid level meter 48 is lower than the deaerator liquid level upper limit value L cg, and the data acquisition and control device 93 controls the feed pump pre-pump 60 and the deaerator working medium recovery regulating valve 42 to be closed.
Working medium water in the deaerator 58 is boosted by the water feed pump pre-pump inlet pipe 49 through the water feed pump pre-pump 60, then enters the water feed pump 62 for boosting again, water fed after boosting again enters the boiler 66 through the water feed main pipe 65, and the water feed pump outlet check valve 63 and the boiler water feed regulating valve 64 are sequentially arranged on the water feed main pipe 65 between the water feed pump 62 and the boiler 66.
The high-temperature water tank 52 is provided with a high-temperature water tank liquid level meter 44, when the measured value of the high-temperature water tank liquid level meter 44 is lower than a set lower limit value, the data acquisition and control device 93 controls the feed pump pre-pump 60 and the deaerator working medium recovery regulating valve 42 to be opened, and the working medium of the deaerator 58 enters the high-temperature water tank 52 through the deaerator working medium recovery pipe 43 until the measured value of the high-temperature water tank liquid level meter 44 is greater than the set lower limit value.
The number of the low-pressure heaters of the present invention is 4, i.e., the first low-pressure heater 41, the second low-pressure heater 34, the third low-pressure heater 25, and the fourth low-pressure heater 18.
The I low-pressure cylinder steam extraction port of the low-pressure cylinder 76 is connected with the steam side of the I low-pressure heater 41 through an I low-pressure heater steam inlet pipe 39, and the I low-pressure heater steam inlet check valve 36, the I low-pressure heater steam inlet stop valve 37 and the I low-pressure heater steam inlet regulating valve 38 are sequentially arranged on the I low-pressure heater steam inlet pipe 39. Steam from the steam inlet pipe 39 of the first low-pressure heater enters the steam side of the first low-pressure heater 41, condensed water is condensed to form drain water, and the drain water flows into the second low-pressure heater 34 through the drain pipe 35 of the first low-pressure heater; the condensate flowing through the i-th low-pressure heater 41 comes from the i-II inter-low-pressure heater condensate header 33 connecting between the i-th low-pressure heater 41 and the II-th low-pressure heater 34.
The II low-pressure cylinder steam extraction port of the low-pressure cylinder 76 is connected with the steam side of the II low-pressure heater 34 through a II low-pressure heater steam inlet pipe 32, and a II low-pressure heater steam inlet check valve 27, a II low-pressure heater steam inlet stop valve 28 and a II low-pressure heater steam inlet regulating valve 31 are sequentially arranged on the II low-pressure heater steam inlet pipe 32. Steam from the steam inlet pipe 32 of the II low-pressure heater enters the II low-pressure heater 34, condensed water is condensed to form drain water, and the drain water flows into the III low-pressure heater 25 through the drain pipe 26 of the II low-pressure heater; the condensate flowing through the II low pressure heater 34 comes from the II-iii inter-low pressure heater condensate header 24 connecting between the II low pressure heater 34 and the iii low pressure heater 25.
The third low-pressure cylinder steam extraction port of the low-pressure cylinder 76 is connected with the steam side of the third low-pressure heater 25 through a third low-pressure heater steam inlet pipe 23, and the third low-pressure heater steam inlet pipe 23 is sequentially provided with a third low-pressure heater steam inlet check valve 20, a third low-pressure heater steam inlet stop valve 21 and a third low-pressure heater steam inlet regulating valve 22. Steam from the steam inlet pipe 23 of the third low-pressure heater enters the third low-pressure heater 25, condensed water is condensed to form drain water, and the drain water flows into the IV low-pressure heater 18 through the drain pipe 19 of the third low-pressure heater; the condensate flowing through the iii low pressure heater 25 comes from the iii-IV inter-low pressure heater condensate header 17 connecting between the iii low pressure heater 25 and the IV low pressure heater 18.
The IV low pressure cylinder steam extraction port of the low pressure cylinder 76 is connected with the steam side of the IV low pressure heater 18 through an IV low pressure heater steam inlet pipe 16, and the IV low pressure heater steam inlet pipe 16 is sequentially provided with an IV low pressure heater steam inlet check valve 13, an IV low pressure heater steam inlet stop valve 14 and an IV low pressure heater steam inlet regulating valve 15. Steam from the IV low-pressure heater steam inlet pipe 16 enters the IV low-pressure heater 18, condensed water is condensed to form drain water, and the drain water flows into the condenser 29 through the IV low-pressure heater drain pipe 92; the condensate flowing through the IV low pressure heater 18 comes from the low pressure heater inlet condensate header 8 that connects between the IV low pressure heater 18 and the shaft seal heater 7.
The condensate flow measuring device tests condensate flow in real time, the water side of the shaft seal heater 7 is connected with the water side of the condenser 29 through the condensate pump water outlet main pipe 6, the condensate pump outlet check valve 5, the condensate pump 4 and the condensate pump water inlet main pipe 1, the condensate pump 4 boosts the condensate water in the condenser 29 and then sends the condensate water to sequentially flow through the shaft seal heater 7, the IV low-pressure heater 18, the III low-pressure heater 25, the II low-pressure heater 34 and the I low-pressure heater 41, and finally the condensate water flowing into the I low-pressure heater 41 enters the deaerator 5 through the oxygen inlet condensate water main pipe 40.
The IV low-pressure heater steam inlet check valve 13, the III low-pressure heater steam inlet check valve 20, the II low-pressure heater steam inlet check valve 27, the I low-pressure heater steam inlet check valve 36 and the high-pressure cylinder steam exhaust check valve 70 adopt pneumatic butterfly valves. The condensate pump outlet check valve 5 and the boiler water supply regulating valve 64 are heavy hammer check valves. The data acquisition and control module 93 employs OVATION distributed control systems. The high-pressure regulating valve 71 and the medium-pressure regulating valve 73 are hydraulic regulating valves.
The deaerator water level regulating valve 12, the deaerator working medium recovery regulating valve 42, the boiler water supply regulating valve 64 and the condenser condensed water recovery regulating valve 91 adopt electric regulating valves;
The IV low-pressure heater steam inlet regulating valve 15, the III low-pressure heater steam inlet regulating valve 22, the II low-pressure heater steam inlet regulating valve 31, the I low-pressure heater steam inlet regulating valve 38, the high-temperature water tank steam inlet regulating valve 54 and the deaerator steam inlet regulating valve 59 adopt pneumatic regulating valves;
the electric stop valve 47 at the outlet of the deaerator water supplementing pump and the electric stop valve 85 at the outlet of the condenser water supplementing pump are all-open and all-closed electric stop valves.
The IV low-pressure heater steam inlet stop valve 14, the III low-pressure heater steam inlet stop valve 21, the II low-pressure heater steam inlet stop valve 28 and the I low-pressure heater steam inlet stop valve 37 adopt corrugated pipe stop valves.
The invention further describes a 600MW pure condensing and steam extraction heat supply unit as a case, wherein main design parameters of the unit are shown in table 1, parameters of a frequency converter are shown in table 2, design parameters of a high-temperature water tank 52 are shown in table 3, and a normal-temperature water tank 88 is a closed hollow cylindrical shell and is made of stainless steel materials.
TABLE 1 Main design parameters of the units
Table 2 parameters of the frequency converter
TABLE 3 design parameters for high temperature Water tank
The detailed working principle of the invention is as follows:
All valves are fully closed before the thermal power generating unit is started, and equipment is not started; opening the water change regulating valve 82 to supplement condensed water in the water change workshop to the normal-temperature water tank 88, and automatically throwing the water change regulating valve 82, wherein the aim is to keep the water storage capacity of the normal-temperature water tank 88 to be one half of the volume of the water change regulating valve; after the normal temperature water tank 88 has working medium condensed water, the condenser water supplementing bypass regulating valve 84 can be opened to convey the condensed water to the condenser 29, and the water level target of the condenser 29 is still 0.5 (L nd+Lng); if the full Guan Ningqi condenser water replenishing bypass regulating valve 84 and the full-opening condenser water replenishing pump outlet electric valve 85 are used for accelerating the replenishing of the condensate water flow, the condenser water replenishing pump 86 is started to convey the condensate water to the condenser 29, and the water level of the target condenser 29 is 0.5 (L nd+Lng).
Starting the condensate pump 4, controlling the rotation speed of the condensate pump motor 3 driving the condensate pump 4 through the frequency converter 2, gradually fully opening the deaerator water level regulating valve 12, controlling the flow of condensate to be conveyed to the deaerator 58 through the frequency converter 2, and automatically throwing the frequency converter 2, wherein the water level of the target deaerator 58 is 0.5 (L cd+Lcg).
Starting a feed pump pre-pump 60, starting a feed pump 62, and condensing water on the boiler by opening a boiler feed water regulating valve 64; after the system is filled with condensed water, the unit is started according to a normal starting flow, the steam turbine is turned into grid-connected power generation after the boiler 66 ignites and raises the steam temperature, the deaerator working medium recovery regulating valve 42 is started to supplement the condensed water to the high-temperature water tank 52, the aim is that the water storage capacity of the high-temperature water tank 52 is half of the volume of the high-temperature water tank, and the deaerator working medium recovery regulating valve 42 is closed after the water level aim is achieved.
When the three-phase power parameter tester 78 shows that the power of the generator exceeds 0.3P N, in this embodiment, namely 180MW, the frequency modulation function of the variable-frequency condensate pump, namely the on-off switch is put into 1 by the data acquisition and control module 93, and at this time, the frequency converter 2 exits the target of automatically tracking the water level of the deaerator 58 to be 0.5 (L cd+Lcg).
The data acquisition and control module 93 inputs the condensate pump frequency modulation function, and the control schematic diagram is shown in fig. 2. In fig. 2: when the on-off switch is arranged at 1, the frequency modulation function of the condensate pump is put into operation; when the switching switch is set to 0, the frequency modulation function of the variable-frequency condensate pump is exited; f is a power grid frequency signal, and is tested in real time by a three-phase power parameter tester 78, wherein the unit is Hz; Δf is a signal frequency difference value, the unit is Hz, and is determined by the formula (1); k 0 is a conversion coefficient for converting the delta f signal frequency difference value into a power instruction; ps is the current operator power instruction of the unit MW; k 1 is a control feedforward coefficient, and is 1.0-1.5; pc is a frequency modulation power command signal, MW is unit, rc is a condensate pump rotating speed command signal, r/min is unit; k 2 is to convert the frequency modulation power command signal P C into a condensate pump rotating speed command signal Rc, K 2 is determined by a formula (3), and the unit is r/min/MW; rs is a rotating speed instruction signal of a variable-frequency condensate pump operator, and the unit is r/min; the rotation speed of the condensate pump is regulated in real time under the action of instructions Rc and Rs, so that the condensate flow rate passing through the first low-pressure heater 41, the second low-pressure heater 34, the third low-pressure heater 25 and the fourth low-pressure heater 18 is controlled; pe is the generator power real-time value, which is tested in real time by the three-phase power parameter tester 78; the filter line block module is a PID control model, kp is a proportional coefficient, K D is a differential coefficient, and K I is an integral coefficient.
Δf is calculated from the grid frequency signal f and 50Hz measured by the three-phase power parameter tester 78, and is obtained by:
Δf＝f-50； (1)
K 0 is a conversion coefficient for converting the Δf signal frequency difference value into a power command, and can be obtained by calculating the formula (2):
K0＝λPN/2.5＝λ600/2.5＝240λ； (2)
Lambda in the formula (2) is the frequency modulation power coefficient of the variable-frequency condensate pump, no unit exists, the value range is 0-0.5, and the setting is carried out according to the frequency modulation participation degree; p N is the rated power of the generator set, and the unit MW.
K 2 is defined by formula (3):
K2＝RTHA/PTHAC； (3)
Calculated according to data equation (3) of table 1:
K2＝RTHA/PTHAC＝1200/40＝30； (4)
The three-phase power parameter tester 78 calculates the power grid frequency signal f tested in real time and 50Hz to obtain a signal frequency difference value Δf, wherein Δf exceeds a dead zone + - Δe, in the embodiment, Δe=0.033 Hz, Δf converts the Δf signal frequency difference value into a power command through a conversion coefficient K 0, the current power command P S of the unit subtracts the power command to form a new power command P, the first path of P is immediately converted into P C through a control feedforward coefficient K 1, the power command signal P C is converted into a condensate pump rotating speed command signal R C through K 2, and a condensate pump operator rotating speed command signal R S is superimposed under the action of the command R C to regulate the rotating speed of the condensate pump in real time; after the rotation speed of the condensate pump is changed, the condensate flow passing through the I low-pressure heater 41, the II low-pressure heater 34, the III low-pressure heater 25 and the IV low-pressure heater 18 is correspondingly changed, and after the condensate flow is changed, the steam flow of the steam sides of the low-pressure heaters such as the I low-pressure heater 41, the II low-pressure heater 34, the III low-pressure heater 25 and the IV low-pressure heater 18 is changed, namely the steam extraction amount of the low-pressure cylinder 76 is changed, so that the mechanical power output by the thermal power generating unit is changed, the unit participates in the regulation of the frequency of a power grid, and plays a role in maintaining the stability of the frequency of the power grid;
The second new power command P is compared with the power real-time value Pe of the generator rotor 81, the deviation is input into a PID link, the output of the PID link is overlapped with the output signal converted by the control feedforward coefficient K 1 to form a new frequency modulation power command signal P C, the frequency modulation power command signal P C is converted into a new condensate pump rotating speed command signal R C through K 2, and the frequency converter 2 is controlled to readjust the rotating speed of the condensate pump 4 according to the new condensate pump rotating speed command signal R C until the deviation between the new power command P and the power real-time value Pe of the generator rotor 81 is zero; the operation is repeated again when a new signal frequency difference value deltaf occurs.
After frequency modulation is put into operation, the condensate flow rate of the first low-pressure heater 41, the second low-pressure heater 34, the third low-pressure heater 25 and the fourth low-pressure heater 18 is changed in real time, so that the condensate flow rate entering the deaerator 58 is correspondingly changed, at the moment, when the deaerator liquid level value monitored by the deaerator liquid level meter 48 in real time exceeds the deaerator liquid level upper limit value L cg, the deaerator working medium recovery regulating valve 42 is automatically opened to regulate, and the deaerator 58 working medium enters the high-temperature water tank 52 through the deaerator working medium recovery pipe 43 until the deaerator liquid level is lower than the deaerator liquid level upper limit value L cg and then is closed. When the test value of the deaerator liquid level meter 48 is lower than the deaerator liquid level lower limit value L cd, opening a deaerator water supplementing bypass regulating valve 56 to supplement high-temperature working medium water for the deaerator 58, and closing the deaerator water supplementing bypass regulating valve 56 after the deaerator liquid level is higher than the deaerator liquid level lower limit value L cd; if the full-open deaerator water supplementing bypass regulating valve 56 supplements high-temperature working medium water for the deaerator 58 and still can not lift the deaerator liquid level within 30 seconds, the deaerator water supplementing pump outlet electric stop valve 47 is automatically opened, the deaerator water supplementing pump 45 is started, meanwhile, the deaerator water supplementing bypass regulating valve 56 is closed, the deaerator 58 is supplemented with the high-temperature working medium water through the deaerator water supplementing main pipe 46, and after the deaerator liquid level is higher than the deaerator liquid level lower limit value L cd, the deaerator water supplementing pump 45 is stopped to operate, and the deaerator water supplementing pump outlet electric stop valve 47 is closed.
The flow rate of the condensate pumped from the condenser 29 changes in real time after the frequency modulation is put into operation, and the liquid level of the condenser 29 correspondingly occurs; when the test value of the condenser liquid level meter 30 is lower than the lower limit value L nd of the condenser liquid level, the condenser water supplementing bypass regulating valve 84 is automatically opened to supplement normal-temperature working medium condensed water to the condenser 29 until the test value of the condenser liquid level meter 30 is higher than the lower limit value L nd of the condenser liquid level, and the condenser water supplementing bypass regulating valve 84 is closed. If the full-open condenser water supplementing bypass regulating valve 84 supplements normal-temperature working medium condensed water to the condenser 29 and still cannot lift the condenser liquid level within 30 seconds, automatically starting the condenser water supplementing pump 86, starting the condenser water supplementing pump outlet electric valve 85, simultaneously, fully Guan Ningqi supplementing normal-temperature working medium condensed water to the condenser 29 through the condenser water supplementing main pipe 87 by the full-open condenser water supplementing bypass regulating valve 84 until the test value of the condenser liquid level meter 30 is higher than the condenser liquid level lower limit value L nd, stopping the operation of the condenser water supplementing pump 86 and closing the water supplementing pump outlet electric stop valve 85; when the test value of the condenser liquid level meter 30 exceeds the upper limit value L ng of the condenser liquid level, the condenser condensate recovery adjusting valve 91 is opened to adjust, the condenser condensate enters the normal-temperature water tank 88 through the condenser condensate recovery pipe 90, and when the test value of the condenser liquid level meter 30 is lower than the upper limit value L ng of the condenser liquid level, the condenser condensate recovery adjusting valve 91 is closed.
The frequency modulation function of the variable-frequency condensate pump is put into or withdrawn from the data acquisition and control module 93 in real time, and the withdrawn state corresponds to the setting of the frequency difference value delta f to be zero, and the operation is the same as the normal operation working condition of the unit.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the elements of the examples have been described generally in terms of functionality in the foregoing description to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present application, it should be understood that the division of the units is merely a logic function division, and there may be other division manners in actual implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims (10)

1. The system comprises a boiler (66), a high-pressure cylinder (72), a medium-pressure cylinder (74), a low-pressure cylinder (76), a condenser (29), a low-pressure heater, a deaerator (58), a generator stator (80) and a generator rotor (81); the boiler (66), the high-pressure cylinder (72), the medium-pressure cylinder (74) and the low-pressure cylinder (76) are connected in sequence; the condenser (29) is connected with the low-pressure cylinder (76), and the low-pressure heater is respectively connected with the low-pressure cylinder (76) and the deaerator (58); the deaerator (58) is connected with a boiler (66); the generator rotor (81) is connected with the low-pressure cylinder (76), and the generator stator (80) is connected with the generator rotor (81);
The method is characterized in that: the device also comprises a data acquisition and control device (93), a current converter (77), a three-phase power parameter tester (78), a voltage converter (79), a frequency converter (2), a condensate pump motor (3), a condensate pump (4), a shaft seal heater (7) and a condensate flow measuring device;
The condensate pump (4) is connected with the water side of the condenser (29) through a condensate pump water inlet main pipe (1); the condensate pump (4) is connected with the shaft seal heater (7) through a condensate pump water outlet main pipe (6), and the shaft seal heater (7) is connected with the low-pressure heater through a low-pressure heater water inlet condensate main pipe (8); a condensate flow measuring device and a deaerator water level regulating valve (12) are arranged on the low-pressure heater water inlet condensate header (8); the condensate flow measuring device and the deaerator water level regulating valve (12) are respectively connected with the data acquisition and control device (93);
The condensate pump (4) boosts the pressure of the condensate in the condenser (29) and then conveys the condensate to flow through the shaft seal heater (7) and the low-pressure heater in sequence, and then enters the deaerator (58) through the condensate main pipe (40) of the oxygen inlet device;
The frequency converter (2) is connected with the condensate pump motor (3) through a cable, and the condensate pump motor (3) is rigidly connected with the condensate pump (4) through a concentric shaft; the frequency converter (2) is connected with the data acquisition and control device (93);
the current converter (77) and the voltage converter (79) are respectively connected with the generator stator (80) and the three-phase power parameter tester (78), and the three-phase power parameter tester (78) is connected with the data acquisition and control device (93);
The system comprises a current converter (77) and a voltage converter (79), wherein the current and the voltage output by a generator stator (80) are converted and then are transmitted to a three-phase power parameter tester (78), the three-phase power parameter tester (78) converts the voltage and the current signals converted by the current converter (77) and the voltage converter (79) into power signals, the frequency of a power grid is tested in real time, finally the power signals and the frequency signals are transmitted to a data acquisition and control device (93), and the data acquisition and control device (93) controls a frequency converter (2) to regulate the rotating speed of a condensate pump (4) according to the power signals and the condensate flow measured by the condensate flow measuring device and entering a low-voltage heater, and then regulates the condensate flow entering the low-voltage heater to regulate the extract flow of the low-voltage heater from the low-voltage cylinder, so that the mechanical power output by a thermal power unit is changed, and the unit participates in the power grid frequency regulation;
The data acquisition and control device (93) is connected with the frequency converter (2) through a one-out-of-two switching switch; when the switching switch is arranged at 1, the frequency converter (2) is put into operation; when the switching switch is set to 0, the frequency converter (2) is switched out.
2. The system for participating in power grid frequency adjustment by using variable-frequency condensate pumps of thermal power generating units according to claim 1, wherein: the condensate flow measuring device comprises a nozzle (9), a flow tester (10) and a differential pressure sampling tube (11).
3. The system for participating in power grid frequency adjustment by using variable-frequency condensate pumps of thermal power generating units according to claim 1, wherein: the condenser (29) is provided with a condenser liquid level meter (30); the condenser liquid level meter (30) is connected with the data acquisition and control device (93) and is used for measuring a liquid level signal of the condenser (29) and transmitting the measured liquid level signal to the data acquisition and control device (93).
4. A system for participating in power grid frequency adjustment of a variable frequency condensate pump of a thermal power generating unit according to claim 3, wherein: still include normal atmospheric temperature water tank (88), normal atmospheric temperature water tank (88) are connected with condenser (29) through condenser moisturizing bypass pipe (83), be provided with condenser moisturizing bypass governing valve (84) on condenser moisturizing bypass pipe (83), condenser moisturizing bypass governing valve (84) are connected with data acquisition and controlling means (93), when the liquid level of condenser (29) of condenser liquid level meter (30) measurement is less than the condenser liquid level lower limit value L nd of settlement, the aperture of condenser moisturizing bypass governing valve (84) is adjusted by data acquisition and controlling means (93), is through condenser moisturizing bypass pipe (83) to condenser (29) by normal atmospheric temperature water tank (88), until the test value of condenser liquid level meter (30) is higher than condenser liquid level lower limit value L nd.
5. The system for participating in power grid frequency adjustment by using variable frequency condensate pumps of thermal power generating units according to claim 4, wherein: the normal temperature water tank (88) is also connected with the condenser (29) through a condenser water supplementing main pipe (87), and the condenser water supplementing main pipe (87) is provided with a condenser water supplementing pump outlet electric valve (85) and a condenser water supplementing pump (86); the condenser water supplementing pump outlet electric valve (85) and the condenser water supplementing pump (86) are respectively connected with the data acquisition and control device (93);
When the liquid level of the condenser (29) measured by the condenser liquid level meter (30) is lower than a set condenser liquid level lower limit value L nd, and the data acquisition and control device (93) controls the condenser water supplementing bypass regulating valve (84) to be fully opened, and the liquid level of the condenser (29) cannot be lifted in a set time, the data acquisition and control device (93) controls the condenser water supplementing pump outlet electric valve (85) and the condenser water supplementing pump (86) to be opened, and meanwhile, the condenser water supplementing bypass regulating valve (84) is fully Guan Ningqi, and the normal-temperature water tank (88) supplements normal-temperature working medium condensed water to the condenser (29) through the condenser water supplementing main pipe (87), so that the test value of the condenser liquid level meter (30) is higher than the condenser liquid level lower limit value L nd, and the data acquisition and control device (93) controls the condenser water supplementing pump (86) to be stopped and the condenser water supplementing pump outlet electric valve (85) to be closed.
6. A system for participating in power grid frequency adjustment of a variable frequency condensate pump of a thermal power generating unit according to claim 3, wherein: the low-pressure heater water inlet condensate mother pipe (8) is connected with the normal-temperature water tank (88) through the condenser condensate recovery pipe (90), a condenser condensate recovery regulating valve (91) is arranged on the condenser condensate recovery pipe (90), the condenser condensate recovery regulating valve (91) is connected with the data acquisition and control device (93), when the test value of the condenser liquid level meter (30) is higher than the upper limit value L ng of the condenser liquid level, the data acquisition and control device (93) opens the condenser condensate recovery regulating valve (91), condensate of the condenser (29) enters the normal-temperature water tank (88) through the condenser condensate recovery pipe (90), and when the test value of the condenser liquid level meter (30) is lower than the upper limit value L ng of the condenser liquid level, the data acquisition and control device (93) controls the condenser condensate recovery regulating valve (91) to be closed.
7. The system for participating in power grid frequency adjustment by using variable-frequency condensate pumps of thermal power generating units according to claim 1, wherein: the deaerator (58) is provided with a deaerator liquid level meter (48), and the deaerator liquid level meter (48) and a data acquisition and control device (93) are used for measuring the liquid level of the deaerator (58) and transmitting the measured liquid level of the deaerator (58) to the data acquisition and control device (93);
the middle pressure cylinder (74) is connected with the deaerator (58) through a middle pressure cylinder steam exhaust and extraction pipe check valve (51) and a deaerator steam inlet pipe (57), and a deaerator steam inlet regulating valve (59) is arranged on the deaerator steam inlet pipe (57).
8. The system for participating in power grid frequency adjustment by using variable-frequency condensate pumps of thermal power generating units according to claim 7, wherein: the high-temperature water tank (52) is further included, and the medium-pressure cylinder (74) is connected with the steam side of the high-temperature water tank (52) through a medium-pressure cylinder steam exhaust and extraction main pipe (50) and a high-temperature water tank steam inlet pipe (53); the water side of the high-temperature water tank (52) is connected with the water side of a deaerator (58) through a deaerator water supplementing bypass pipe (55), and a deaerator water supplementing bypass regulating valve (56) is arranged on the deaerator water supplementing bypass pipe (55); when the measured value of the deaerator liquid level meter (48) is lower than the deaerator liquid level lower limit value L cd, the data acquisition and control device (93) opens the deaerator water supplementing bypass regulating valve (56), the high-temperature water tank (52) supplements high-temperature working medium water for the deaerator (58) through the deaerator water supplementing bypass pipe (55) until the data acquisition and control device (93) controls the deaerator water supplementing bypass regulating valve (56) to be closed after the measured value of the deaerator liquid level meter (48) is higher than the deaerator liquid level lower limit value L cd.
9. The system for participating in power grid frequency adjustment by using variable frequency condensate pumps of thermal power generating units according to claim 8, wherein: the high-temperature water tank (52) is also connected with a deaerator (58) through a deaerator water supplementing main pipe (46), and a deaerator water supplementing pump (45) and an electric stop valve (47) at the outlet of the deaerator water supplementing pump are arranged on the deaerator water supplementing main pipe (46); the oxygen device water supplementing pump (45) and the oxygen device water supplementing pump outlet electric stop valve (47) are respectively connected with the data acquisition and control device (93), when the measured value of the oxygen device liquid level meter (48) is lower than the oxygen device liquid level lower limit value L cd and the oxygen device water supplementing bypass regulating valve (56) is fully opened, the oxygen device water supplementing pump (45) and the oxygen device water supplementing pump outlet electric stop valve (47) are controlled by the data acquisition and control device (93) to be opened, the oxygen device water supplementing bypass regulating valve (56) is closed, the high-temperature water tank (52) supplements high-temperature working medium water for the oxygen device (58) through the oxygen device water supplementing main pipe (46), and the data acquisition and control device (93) controls to stop the operation of the oxygen device water supplementing pump (45) and close the oxygen device water supplementing pump outlet electric stop valve (47) after the measured value of the oxygen device liquid level meter (48) is higher than the oxygen device liquid level lower limit value L cd.
10. The system for participating in power grid frequency adjustment by using variable frequency condensate pumps of thermal power generating units according to claim 8, wherein: the deaerator (58) is connected with a water feeding pump pre-pump (60) through a water feeding pump pre-pump inlet pipe (49), a water outlet of the water feeding pump pre-pump (60) is connected with a high-temperature water tank (52) through a deaerator working medium recovery pipe (43), a deaerator working medium recovery regulating valve (42) is arranged on the deaerator working medium recovery pipe (43), and the water feeding pump pre-pump (60) and the deaerator working medium recovery regulating valve (42) are connected with a data acquisition and control device (93);
When the measured value of the deaerator liquid level meter (48) is higher than the deaerator liquid level upper limit value L cg, the data acquisition and control device (93) controls the feed pump pre-pump (60) and the deaerator working medium recovery regulating valve (42) to be opened, the working medium of the deaerator (58) enters the high-temperature water tank (52) through the deaerator working medium recovery pipe (43) until the measured value of the deaerator liquid level meter (48) is lower than the deaerator liquid level upper limit value L cg, and the data acquisition and control device (93) controls the feed pump pre-pump (60) and the deaerator working medium recovery regulating valve (42) to be closed.
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