LU506672B1 - Method and system for deep utilization of waste heat from gas turbine boilers - Google Patents
Method and system for deep utilization of waste heat from gas turbine boilers Download PDFInfo
- Publication number
- LU506672B1 LU506672B1 LU506672A LU506672A LU506672B1 LU 506672 B1 LU506672 B1 LU 506672B1 LU 506672 A LU506672 A LU 506672A LU 506672 A LU506672 A LU 506672A LU 506672 B1 LU506672 B1 LU 506672B1
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- steam
- heat
- heat exchange
- flue gas
- waste heat
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- 239000002918 waste heat Substances 0.000 title claims abstract description 66
- 239000007789 gas Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000003546 flue gas Substances 0.000 claims abstract description 82
- 230000005611 electricity Effects 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims description 28
- 238000011084 recovery Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000011282 treatment Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- 230000037361 pathway Effects 0.000 claims 1
- 238000003801 milling Methods 0.000 abstract description 6
- 239000003245 coal Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
-
- 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
-
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The present invention discloses a method and system for deep utilization of waste heat from gas turbine boilers. It includes installing a water distribution pipe at the output end of the deaerator and mounting a heat exchange furnace at the end of the water distribution pipe. The flue gas discharged from the boiler is introduced into the heat exchange furnace as its heat source. The residual heat from the flue gas is used to heat the deoxygenated water inside the heat exchange furnace, generating steam. A portion of the generated steam is introduced into the low-pressure cylinder of the steam turbine to perform work, while another portion is introduced into the screw expansion generator as a heat source to achieve low-temperature waste heat electricity generation. The electrical energy generated by the screw expansion generator is provided for use by electrical equipment. The method and system of the invention utilize high-temperature flue gas as a heat source to heat deoxygenated water. By using heat exchange equipment to simulate the steam generation of boilers, the produced steam is supplied to steam turbines for work and to screw expansion generators for electricity generation. The electricity generated is used for the boiler milling, flue gas systems, and other applications, reducing the power consumption of the unit and achieving deep utilization of the boiler flue gas waste heat.
Description
METHOD AND SYSTEM FOR DEEP UTILIZATION OF WASTE HEAT FROM
GAS TURBINE BOILERS
The present invention relates to the field of energy recovery technology, more specifically, it relates to a method and system for deep utilization of waste heat from gas turbine boilers.
Background Technology
Thermal power generation, simply put, involves the use of heat generated from the combustion of combustibles to heat water into saturated steam, which drives a steam turbine, in turn, driving a generator to produce electricity. In the current context of China's power generation system, thermal power generation refers to coal-fired power generation. Even with the accelerated development of nuclear, hydro, wind, and photovoltaic power generation, the electricity generated from thermal power remains mainstream and irreplaceable.
Boilers play a pivotal role in thermal power generation systems, including the milling system and the flue gas system. The milling system includes the original coal bunker, coal feeder, coal mill, ancillary pipelines, and the burners in the furnace, along with a primary air fan for conveying pulverized coal. The flue gas system includes the forced draft fan, induced draft fan, air preheater, electrostatic precipitator, and desulfurization system. Coal is pulverized in the milling system, mixed with the primary air sent to the burner and the combustion-supporting air from the forced draft fan, and burned in the furnace to produce flue gas. The induced draft fan draws the flue gas, overcoming resistance along the path, and after various treatments to meet standards, it is discharged into the atmosphere through the chimney.
Typically, flue gas is discharged directly after dust removal, wasting its heat.
Existing technologies use flue gas to provide heat to the air preheater for heating cold air delivered to the boiler for combustion. However, the exhaust temperature is usually between 155-165°C, which limits the extent to which it can raise air temperature and 7506672 thus fails to maximize the use of its thermal energy. Therefore, there is a need for a method and system for deep utilization of waste heat from gas turbine boilers in this technical field.
Content of the Invention
To solve the aforementioned problems, the invention provides the following technical solutions:
A method for deep utilization of waste heat from gas turbine boilers, including:
Step 1: Setting up a water distribution pipe at the output end of the deaerator, and installing a heat exchange furnace at the end of the water distribution pipe;
Step 2: Introducing flue gas discharged from the boiler into the heat exchange furnace as the heat source of the heat exchange furnace;
Step 3: Heating deoxygenated water in the heat exchange furnace with the residual heat of the flue gas to generate steam;
Step 4: Introducing part of the generated steam into the low-pressure cylinder of the steam turbine for work, and another part into the screw expansion generator as the heat source to achieve low-temperature waste heat power generation;
Step 5: Supplying the electrical energy generated by the screw expansion generator for use by electrical equipment.
Preferably, in the aforementioned method for deep utilization of waste heat from gas turbine boilers, setting up a water distribution pipe at the output end of the deaerator and installing a heat exchange furnace at the end of the water distribution pipe includes:
Positioning the water distribution pipe on the pipeline connecting the deaerator to the high-pressure heater, diverting a portion of the deoxygenated water from the boiler feed water system;
Setting up the heat exchange furnace, which includes a water medium chamber and a heat source chamber, connected through a heat exchange device; introducing that portion of deoxygenated water into the water medium chamber.
Preferably, in the aforementioned method for deep utilization of waste heat from 7506672 gas turbine boilers, introducing flue gas discharged from the boiler into the heat exchange furnace as the heat source includes:
Adding a primary induced draft device at the boiler flue gas outlet, conveying high-temperature flue gas into the heat source chamber through the primary induced draft device, and heating that portion of deoxygenated water through the heat exchange device;
After providing heat energy to the deoxygenated water, the high-temperature flue gas cools down to low-temperature flue gas, which is then introduced into the dust collector through a secondary induced draft device and discharged through the chimney after treatment.
Preferably, in the aforementioned method for deep utilization of waste heat from gas turbine boilers, introducing part of the generated steam into the low-pressure cylinder of the steam turbine for work includes:
Setting up steam pipe | at the low-pressure cylinder of the steam turbine, the other end of steam pipe | connected to the top of the water medium chamber of the heat exchange furnace; steam pipe | is equipped with electric valve |, for controlling the connectivity of steam pipe |;
Mixing the steam generated by the heat exchange furnace with the steam generated by the boiler in the low-pressure cylinder of the steam turbine to work together.
Preferably, in the aforementioned method for deep utilization of waste heat from gas turbine boilers, introducing another part of the generated steam into the screw expansion generator as the heat source for low-temperature waste heat power generation includes:
Setting up steam pipe Il at the input end of the screw expansion generator, the other end of steam pipe Il connected to the top of the water medium chamber of the heat exchange furnace; steam pipe Il is equipped with electric valve Il, for controlling the connectivity of steam pipe Il;
Introducing the steam generated by the heat exchange furnace into the screw expansion generator through steam pipe II for work, to achieve low-temperature waste 7506672 heat power generation.
Preferably, in the aforementioned method for deep utilization of waste heat from gas turbine boilers, supplying the electrical energy generated by the screw expansion generator for use by electrical equipment includes:
Providing the generated electrical energy to the primary induced draft device as well as the deaerator and feedwater pump for their power supply;
Providing the generated electrical energy to other electrical equipment in the boiler feedwater system and boiler combustion system for their power supply.
A system for deep utilization of waste heat from gas turbine boilers, including:
A recovery heat exchanger, connected respectively to the deaerator and the boiler flue gas outlet, used to heat deoxygenated water with the waste heat from flue gas, generating steam and reducing flue gas temperature;
A waste heat power generation device, connected to the recovery heat exchanger, used to receive steam and generate electrical energy with that steam;
An electrical energy transmission device, connected to the waste heat power generation device, used to transmit the generated electrical energy to electrical equipment for power supply.
Preferably, in the aforementioned system for deep utilization of waste heat from gas turbine boilers, the recovery heat exchanger includes:
A water distribution pipe, positioned on the pipeline connecting the deaerator to the high-pressure heater, used to divert a portion of deoxygenated water;
A heat exchange furnace, connected to the end of the water distribution pipe, equipped with a water medium chamber and a heat source chamber, both chambers connected through a heat exchange device; the end of the water distribution pipe is connected to the water medium chamber;
A flue gas pipe, one end connected to the boiler flue gas outlet, the other end connected to the heat source chamber of the heat exchange furnace, used to establish a path for high-temperature flue gas to enter the heat exchange furnace;
An induced draft fan |, positioned on the flue gas pipe, used to draw high-
temperature flue gas through the flue gas pipe into the heat exchange furnace; 7506672
An induced draft fan Il, connected to the outlet end of the heat source chamber of the heat exchange furnace, used to draw out the heat-exchanged low-temperature flue gas and convey it to the treatment end, eventually discharging it through the 5 chimney.
Preferably, in the aforementioned system for deep utilization of waste heat from gas turbine boilers, the waste heat power generation device includes:
The screw expansion generator, connected to the steam outlet of the water medium chamber of the heat exchange furnace through steam pipe Il, used to obtain the steam produced by the heat exchange furnace and use that steam for power generation;
The electric valve Il, connected to steam pipe Il, used to control the connectivity of steam pipe Il.
Preferably, in the aforementioned system for deep utilization of waste heat from gas turbine boilers, the waste heat power generation device also includes:
The steam pipe |, one end connected to the steam outlet of the water medium chamber of the heat exchange furnace, the other end connected to the low-pressure cylinder of the steam turbine, used to mix the steam produced by the heat exchange furnace with the steam produced by the boiler in the low-pressure cylinder of the steam turbine to work together;
The electric valve |, connected to steam pipe |, used to control the connectivity of steam pipe |.
Based on the technical solutions provided above, compared with existing technologies, the beneficial effects of this application are as follows:
The method and system of the invention utilize high-temperature flue gas as a heat source to heat deoxygenated water. By using heat exchange equipment to simulate the steam generation of boilers, the produced steam is supplied to steam turbines for work and to screw expansion generators for electricity generation. The electricity generated is used for the boiler milling, flue gas systems, and other applications, reducing the power consumption of the unit and achieving deep utilization of the boiler flue gas waste heat. 7506672
To more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings needed for the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flowchart of the method of the invention;
FIG. 2 is a flowchart of the system of the invention.
In the drawings, 1, water distribution pipe; 2, deaerator; 3, high-pressure heater; 4, boiler; 5, feedwater pump; 6, heat exchange furnace; 7, water medium chamber; 8, heat source chamber; 9, heat exchange device; 10, flue gas pipe; 11, induced draft fan |, 12, induced draft fan Il; 13, chimney; 14, screw expansion generator; 15, steam pipe
Il; 16, steam pipe |; 17, low-pressure cylinder of the steam turbine; 18, electric valve |; 19, electric valve II.
Specific Embodiments
The following will describe the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The following will describe the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of 7506672 ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
In the present invention, terms such as "first," "second," "third" are used only for descriptive purposes and should not be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. Terms like "installed," "connected," "connection," "fixed" should be broadly understood. For example, "connected" can mean fixedly connected, detachably connected, or integrally connected; "connected" can mean directly connected or indirectly connected through an intermediary medium. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
In the description of the present invention, it should be understood that terms such as "upper," "lower," "left," "right," "front," "back," etc., indicate orientation or positional relationships based on the orientations or positional relationships shown in the drawings. They are for convenience of description of the present invention and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be considered as limiting the invention.
In the description of this specification, the terms "an embodiment," "some embodiments," "an example," "a specific example," etc., indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of such terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.
In an embodiment, please refer to FIGS. 1-2, a method for deep utilization of waste heat from gas turbine boilers includes:
Step 1: Setting up a water distribution pipe 1 at the output end of the deaerator
2, and installing a heat exchange furnace 6 at the end of the water distribution pipe 1; 7506672
Step 2: Introducing flue gas discharged from the boiler 4 into the heat exchange furnace 6, furnace as the heat source of the heat exchange furnace 6;
Step 3: Heating deoxygenated water in the heat exchange furnace 6 with the residual heat of the flue gas to generate steam;
Step 4: Introducing part of the generated steam into the low-pressure cylinder 17 of the steam turbine for work, and another part into the screw expansion generator 14 as the heat source to achieve low-temperature waste heat power generation;
Step 5: Supplying the electrical energy generated by the screw expansion generator 14 for use by electrical equipment.
The principle of the above embodiment is that the exhaust temperature mainly depends on the node temperature difference (ATp). Reducing ATp can lower the exhaust temperature, but at the cost of significantly increasing the evaporative heating surface, thus increasing manufacturing costs. ATp is usually set at 8-20°C; therefore, to fully realize deep energy-saving utilization of waste heat from gas turbine boilers, it is crucial to consider the impact of ATp on the utilization of flue gas waste heat and achieve cascading utilization of flue gas waste heat as much as possible.
The beneficial effect of the above embodiment is the realization of deep utilization of flue gas, thereby improving the economic efficiency of the unit.
Please refer to FIGS. 1-2, to further optimize the above scheme, a method for deep utilization of waste heat from gas turbine boilers includes setting up a water distribution pipe 1 at the output end of the deaerator 2, and installing a heat exchange furnace 6 at the end of the water distribution pipe 1 which includes:
Positioning the water distribution pipe 1 on the pipeline connecting the deaerator 2 and the high-pressure heater 3, diverting a portion of deoxygenated water from the boiler 4 feedwater system;
Setting up the heat exchange furnace 6, which includes a water medium chamber 7 and a heat source chamber 8, connected through a heat exchange device 9; introducing that portion of deoxygenated water into the water medium chamber 7.
It should be noted that the heat exchange device 9 can be selected from existing technologies, such as membrane structures or metal conduction structures. Using 7506672 deoxygenated water output from the rotating deaerator 2 as the medium can better simulate the boiler environment. The temperature of high-temperature flue gas is around 156.4°C, and through the heat exchange means of the embodiment, it can be reduced to below 90°C, greatly utilizing the heat of flue gas while also increasing the power generation efficiency of the unit.
Please refer to FIGS. 1-2, to further optimize the above scheme, a method for deep utilization of waste heat from gas turbine boilers includes introducing flue gas discharged from the boiler 4 into the heat exchange furnace 6 as the heat source for the heat exchange furnace 6, which includes:
Adding a primary induced draft device at the flue gas outlet of the boiler 4, conveying high-temperature flue gas into the heat source chamber 8 through the primary induced draft device, and heating that portion of deoxygenated water through the heat exchange device 9;
After providing heat energy to the deoxygenated water, the high-temperature flue gas cools down to low-temperature flue gas, which is then introduced into a dust collector through a secondary induced draft device and discharged through the chimney 13 after treatment.
It should be noted that the flue gas after heat exchange needs to be treated before discharge, and its treatment process is an existing technical means. This embodiment inserts the heat exchange process before flue gas discharge, maximizing the utilization of flue gas heat. However, since the flue gas is untreated, it is necessary to clean the interior of the heat exchange furnace chamber in a timely manner and ensure that flue gas does not leak. During the heat exchange process, the amount of deoxygenated water entering the chamber is fixed. When the water intake reaches a preset value, control the feedwater pump to stop supplying water, disconnecting the connection between the water distribution pipe and the chamber, and then conducting heat exchange to generate steam.
Please refer to FIGS. 1-2, to further optimize the above scheme, a method for deep utilization of waste heat from gas turbine boilers includes introducing part of the generated steam into the low-pressure cylinder 17 of the steam turbine for work, 7506672 which includes:
Setting up steam pipe | 16 at the low-pressure cylinder 17 of the steam turbine, the other end of steam pipe | 16 connected to the top of the water medium chamber 7 of the heat exchange furnace 6; steam pipe | 16 is equipped with electric valve | 18, for controlling the connectivity of steam pipe | 16;
Mixing the steam generated by the heat exchange furnace 6 with the steam generated by the boiler 4 in the low-pressure cylinder 17 of the steam turbine to work together.
It should be noted that by setting electric valve | 18, steam can be delivered to the steam turbine when it meets the standard. Preferably, a pressurization device is set at the steam outlet of the chamber to increase the steam pressure, better serving the steam turbine for work.
Please refer to FIGS. 1-2, to further optimize the above scheme, a method for deep utilization of waste heat from gas turbine boilers includes introducing another part of the generated steam into the screw expansion generator 14 as the heat source for low-temperature waste heat power generation, which includes:
Setting up steam pipe Il 15 at the input end of the screw expansion generator 14, the other end of steam pipe Il 15 connected to the top of the water medium chamber 7 of the heat exchange furnace 6; steam pipe Il 15 is equipped with electric valve Il 19, for controlling the connectivity of steam pipe II 15;
Introducing the steam generated by the heat exchange furnace 6 through steam pipe II 15 into the screw expansion generator 14 for work, to achieve low-temperature waste heat power generation.
Specifically, by setting electric valve Il 19, steam can be delivered to the screw expansion generator 14 when it meets the standard. Preferably, a pressurization device is set at the steam outlet of the chamber to increase the steam pressure, better serving the screw expansion generator 14 for work.
Please refer to FIGs. 1-2, to further optimize the aforementioned scheme, a method for deep utilization of waste heat from gas turbine boilers for providing the electrical energy generated by the screw expansion generator 14 for use by electrical 7506672 equipment includes:
Providing the generated electrical energy to the primary induced draft device as well as to the deaerator 2 and feedwater pump 5 for their power supply;
Providing the generated electrical energy to other electrical equipment within the boiler 4 feedwater system and the boiler 4 combustion system for their power supply.
It should be noted that the output electrical energy can not only supply power to devices necessary for its own operation, such as the deaerator 2, feedwater pump 5, and induced draft fans but can also power other devices required by the boiler system, such as dust collectors, coal mills, water pumps, etc. This achieves not only the ability to perform work for the steam turbine but also to supply electrical energy to the boiler system, thus deeply utilizing flue gas waste heat and reducing energy loss.
In an embodiment, please refer to FIG.2, a system for deep utilization of waste heat from gas turbine boilers includes:
A heat recovery device 9, connected to both the deaerator 2 and the boiler 4 flue gas outlet, utilized for heating deoxygenated water with the waste heat from flue gas, generating steam, and reducing flue gas temperature;
A waste heat power generation device, connected to the heat recovery device 9, for receiving steam and generating electrical energy with that steam;
An electrical energy transmission device, connected to the waste heat power generation device, for transporting the generated electrical energy to electrical equipment for their power supply.
Specifically, electrical energy generated by recovering flue gas thermal energy is used to power various electrical equipment in the boiler system, achieving deep utilization of flue gas waste heat.
Please refer to FIG.2, to further optimize the above scheme, a system for deep utilization of waste heat from gas turbine boilers, the heat recovery device 9 includes:
A water distribution pipe 1, set up between the deaerator 2 and the high-pressure heater 3, used to divert a portion of deoxygenated water;
A heat exchange furnace 6, connected to the end of the water distribution pipe 1,
equipped with a water medium chamber 7 and a heat source chamber 8, both 7506672 chambers connected through a heat exchange device 9; the end of the water distribution pipe 1 leads into the water medium chamber 7;
A flue gas pipe 10, one end connected to the boiler 4 flue gas outlet, the other end to the heat exchange furnace 6 heat source chamber 8, establishing a path for high-temperature flue gas into the heat exchange furnace 6;
An induced draft fan | 11, set on the flue gas pipe 10, to draw high-temperature flue gas through the flue gas pipe 10 into the heat exchange furnace 6;
An induced draft fan Il 12, connected to the heat source chamber 8 outlet end of the heat exchange furnace 6, to draw out heat-exchanged low-temperature flue gas and transport it to the treatment end, eventually discharging it through the chimney 13.
It should be noted that diverting a portion of deoxygenated water through the water distribution pipe 1 is an existing technical means, achievable with feedwater pump 5, while induced draft fan | 11 and induced draft fan Il 12 are commonly used devices in boiler discharge systems. This embodiment introduces an additional draft device to draw untreated flue gas for heat exchange, maximizing the utilization of thermal energy in the flue gas.
Please refer to FIG.2, to further optimize the above scheme, a system for deep utilization of waste heat from gas turbine boilers, the waste heat power generation device includes:
A screw expansion generator 14, connected to the steam outlet of the heat exchange furnace 6 water medium chamber 7 through steam pipe Il 15, used to capture steam produced by the heat exchange furnace 6 and use that steam for power generation;
An electric valve II 19, connected to steam pipe Il 15, used to control the connectivity of steam pipe Il 15.
Specifically, the screw expansion generator 14 utilizes steam, hot water, thermal fluids, or contaminated thermal energy as a power source, converting thermal energy into mechanical energy to drive generators, fans, pumps, compressors, mixers, coal mills, milling machines, and other mechanical equipment loads, replacing the original 7506672 electric motors for power recovery and can also directly generate electricity for the grid. Thus, it can supply electrical energy to various electrical equipment within the boiler system through output electrical energy, achieving deep utilization of flue gas.
Please refer to FIG.2, to further optimize the above scheme, a system for deep utilization of waste heat from gas turbine boilers also includes:
A steam pipe | 16, one end connected to the steam outlet of the heat exchange furnace 6 water medium chamber 7, the other end to the low-pressure cylinder 17 of the steam turbine, used to mix the steam produced by the heat exchange furnace 6 with the steam produced by the boiler 4 in the low-pressure cylinder 17 of the steam turbine to work together;
An electric valve | 18, connected to steam pipe | 16, used to control the connectivity of steam pipe | 16.
It should be noted that electric valve | 18 and electric valve II 19 are controlled manually according to needs, allowing for switching as required. When the amount of generated steam is large, the valves can also be opened simultaneously to utilize the steam in multiple ways, enhancing the versatility of usage and improving the economic efficiency of the power generation system.
It should be noted that the system provided in the above embodiments is merely for the purpose of illustrating the division of various functional modules, and in actual applications, these functions can be distributed as different functional modules to complete, i.e., the modules or steps in the embodiments of the present invention can be further decomposed or combined to complete all or some of the above-described functions. The names of the modules or steps involved in the embodiments of the present invention are merely for distinguishing between different modules or steps and should not be considered as an improper limitation of the invention.
The term "including" or any other variation thereof is intended to cover a non- exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not only include those elements but may also include other elements not expressly listed or inherent to such process, method, article, or 7506672 apparatus.
Thus far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the drawings. However, it will be readily understood by those skilled in the art that the protection scope of the present invention is not limited to the specific embodiments disclosed. Without departing from the principles of the present invention, modifications or substitutions of related technical features by those skilled in the art are considered to be within the scope of protection of the present invention.
Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the invention.
Thus, if these modifications and variations of the present invention fall within the scope of the invention's claims and their equivalents, the present invention also intends to include these changes and variations. The above description of the disclosed embodiments is intended to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for deep utilization of waste heat from gas turbine boilers, characterized by comprising: Step 1: Setting up a water distribution pipe (1) at the output end of the deaerator (2), and installing a heat exchange furnace 6 at the end of the water distribution pipe (1); Step 2: Introducing flue gas discharged from the boiler (4) into the heat exchange furnace (6), furnace as the heat source of the heat exchange furnace (6); Step 3: Heating deoxygenated water in the heat exchange furnace (6) with the residual heat of the flue gas to generate steam; Step 4: Introducing part of the generated steam into the low-pressure cylinder (17) of the steam turbine for work, and another part into the screw expansion generator (14) as the heat source to achieve low-temperature waste heat power generation; Step 5: Supplying the electrical energy generated by the screw expansion generator (14) for use by electrical equipment.
2. The method for deep utilization of waste heat from gas turbine boilers according to claim 1, characterized in that the setup of a water distribution pipe (1) at the output end of the deaerator (2) and the installation of a heat exchange furnace (6) atthe end of the water distribution pipe (1) comprises: Positioning the water distribution pipe (1) on the pipeline connecting the deaerator (2) and the high-pressure heater (3), diverting a portion of deoxygenated water from the boiler (4) feedwater system; Setting up the heat exchange furnace (6), which comprises a water medium chamber (7) and a heat source chamber (8), connected through a heat exchange device (9); introducing that portion of deoxygenated water into the water medium chamber (7).
3. The method for deep utilization of waste heat from gas turbine boilers according to claim 2, where introducing flue gas discharged from the boiler (4) into the heat exchange furnace (6) as its heat source comprises: 7506672 Adding a primary induced draft device at the flue gas outlet of the boiler (4), conveying high-temperature flue gas into the heat source chamber (8) through this device, and heating that portion of deoxygenated water through the heat exchange device (9); After providing heat energy to the deoxygenated water, the high-temperature flue gas cools down to low-temperature flue gas, which is then introduced into the dust collector through a secondary induced draft device and discharged through the chimney (13) after treatment.
4. The method for deep utilization of waste heat from gas turbine boilers according to claim 3, characterized by the introduction of part of the generated steam into the low-pressure cylinder (17) of the steam turbine for work comprises: Setting up steam pipe I (16) at the low-pressure cylinder (17), the other end of steam pipe | (16) connected to the top of the water medium chamber (7) of the heat exchange furnace (6); steam pipe | (16) is equipped with electric valve | (18), for controlling the connectivity of steam pipe | (16); Mixing the steam generated by the heat exchange furnace (6) with the steam generated by the boiler (4) in the low-pressure cylinder (17) of the steam turbine to work together.
5. The method for deep utilization of waste heat from gas turbine boilers according to claim 4, characterized in that the introduction of another part of the generated steam into the screw expansion generator (14) as the heat source for low- temperature waste heat electricity generation comprises: Setting up steam pipe Il (15) at the input end of the screw expansion generator (14), the other end of steam pipe Il (15) connected to the top of the water medium chamber (7) of the heat exchange furnace (6); steam pipe Il (15) is equipped with electric valve II (19), for controlling the connectivity of steam pipe Il (15); Introducing the steam generated by the heat exchange furnace (6) through steam pipe Il (15) into the screw expansion generator (14) for work, to achieve low- temperature waste heat electricity generation.
6. The method for deep utilization of waste heat from gas turbine boilers 7506672 according to claim 2, characterized in that supplying the electrical energy generated by the screw expansion generator (14) for use by electrical equipment comprises: Providing the generated electrical energy to the primary induced draft device as well as the deaerator (2) and feedwater pump (5) for their power supply; Providing the generated electrical energy to other electrical equipment in the boiler (4) feedwater system and the boiler (4) combustion system for their power supply.
7. A system for deep utilization of waste heat from gas turbine boilers, based on the method for deep utilization of waste heat from gas turbine boilers described in claims 1-6, characterized by comprising: A heat recovery device (9), connected respectively to the deaerator (2) and the boiler (4) flue gas outlet, for heating deoxygenated water with the waste heat from flue gas, generating steam, and reducing flue gas temperature; A waste heat power generation device, connected to the heat recovery device (9), for receiving steam and using it to generate electrical energy; An electrical energy transmission device, connected to the waste heat power generation device, for delivering the generated electrical energy to electrical equipment for their power supply.
8. The system for deep utilization of waste heat from gas turbine boilers according to claim 7, characterized in that the heat recovery device (9) comprises: A water distribution pipe (1), set up between the deaerator (2) and the high- pressure heater (3) to divert a portion of deoxygenated water; A heat exchange furnace (6), connected to the end of the water distribution pipe (1), equipped with a water medium chamber (7) and a heat source chamber (8), both chambers connected through a heat exchange device (9); the end of the water distribution pipe (1) leads into the water medium chamber (7); A flue gas pipe (10), one end connected to the boiler (4) flue gas outlet, the other end to the heat source chamber (8) of the heat exchange furnace (6), establishing a pathway for high-temperature flue gas into the heat exchange furnace (6);
An induced draft fan | (11), set on the flue gas pipe (10), to draw high-temperature 7506672 flue gas through the flue gas pipe (10) into the heat exchange furnace (6); An induced draft fan II (12), connected to the heat source chamber (8) outlet end of the heat exchange furnace (6), to draw out heat-exchanged low-temperature flue gas and convey it to the treatment end, eventually discharging it through the chimney (13).
9. The system for deep utilization of waste heat from gas turbine boilers according to claim 8, characterized in that the waste heat power generation device comprises: The screw expansion generator (14), connected to the steam outlet of the heat exchange furnace (6) water medium chamber (7) through steam pipe Il (15), used to capture the steam produced by the heat exchange furnace (6) and use it for electricity generation; An electric valve Il (19), connected to steam pipe Il (15), for controlling the connectivity of steam pipe II (15).
10. The system for deep utilization of waste heat from gas turbine boilers according to claim 9, characterized in that the waste heat power generation device also comprises: Steam pipe | (16), one end connected to the steam outlet of the heat exchange furnace (6) water medium chamber (7), the other end connected to the low-pressure cylinder (17) of the steam turbine, for mixing the steam produced by the heat exchange furnace (6) with the steam produced by the boiler (4) in the low-pressure cylinder (17) of the steam turbine to work together; An electric valve | (18), connected to steam pipe | (16), for controlling the connectivity of steam pipe | (16).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311013700.XA CN117167710A (en) | 2023-08-11 | 2023-08-11 | Deep utilization method and system for waste heat of gas turbine boiler |
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| LU506672B1 true LU506672B1 (en) | 2024-09-25 |
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| LU506672A LU506672B1 (en) | 2023-08-11 | 2024-03-25 | Method and system for deep utilization of waste heat from gas turbine boilers |
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| Country | Link |
|---|---|
| CN (1) | CN117167710A (en) |
| LU (1) | LU506672B1 (en) |
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2023
- 2023-08-11 CN CN202311013700.XA patent/CN117167710A/en active Pending
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| CN117167710A (en) | 2023-12-05 |
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