CN117803943A - Subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system - Google Patents
Subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system Download PDFInfo
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- CN117803943A CN117803943A CN202311862493.5A CN202311862493A CN117803943A CN 117803943 A CN117803943 A CN 117803943A CN 202311862493 A CN202311862493 A CN 202311862493A CN 117803943 A CN117803943 A CN 117803943A
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- 239000000843 powder Substances 0.000 title claims abstract description 33
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 180
- 238000004146 energy storage Methods 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims description 45
- 239000002817 coal dust Substances 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000009194 climbing Effects 0.000 abstract 1
- 230000004044 response Effects 0.000 description 14
- 238000005338 heat storage Methods 0.000 description 11
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- 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
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/005—Steam superheating characterised by heating method the heat being supplied by steam
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/007—Regulating fuel supply using mechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
- F23K2203/202—Feeding/conveying devices using screws
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention provides a subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system, which comprises: the control circulation loop is matched with the boiler and enables working medium to flow forcedly, and a steam drum is arranged on the control circulation loop; further comprises: the high-temperature water working medium energy storage device is provided with a high-temperature resistant and pressure-bearing structure; a steam charging branch which is provided with a valve II and is connected with a steam pipeline at the steam outlet of the steam drum and is used for introducing high-temperature and high-pressure steam at the steam outlet of the steam drum into the high-temperature water working medium energy storage device when the valve II is opened; a steam energy release branch which is provided with a valve III, is connected with a steam pipeline at the steam outlet of the steam drum and is used for leading high-temperature and high-pressure steam released in the energy release process of the high-temperature working medium energy storage device to the superheater when the valve III is opened; a pulverized coal-reinforcing supply line; the invention has the following beneficial effects: the invention can fundamentally and rapidly improve the quick load-changing capacity of the unit, and realizes that the climbing rate of the coal-fired boiler reaches 5%Pe/min or more.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation, in particular to a subcritical boiler high-temperature water working medium synergistic furnace internal rapid powder feeding and reinforcing energy supply system.
Background
Under the double-carbon target, the acceleration of constructing a novel power system with high new energy duty ratio is an important way for low carbonization transformation of an energy structure, along with the continuous increase of new energy installed capacity such as wind, light and the like in China, the novel power system regulation gap is greatly increased, the problem of insufficient traditional power regulation capacity is increasingly highlighted, and the load-changing response rate and load-changing tracking capacity of the traditional coal-fired generator set are improved, so that the threat of large-scale intermittent wind/light renewable energy intervention on the safety of a power grid is solved, and the safe and stable operation of the power grid is ensured.
The variable load rate of the existing coal-fired power generator set in China is usually 1.0% -2.0% of rated load/min, the requirement of a novel power system on the quick variable load capacity of the coal-fired power generator set (5.0% -8.0% of rated load/min) cannot be met, and the problems that the boiler steam yield response rate is insufficient due to the fact that the boiler has large thermal inertia and strong hysteresis in the processes of coal pulverizing and coal powder conveying processes, the combustion heat release and working medium heat absorption processes of the boiler, the heat storage of metal parts of a heating surface of the boiler and the like, and the boiler is insufficient in the process of changing the load response rate to more than 10 minutes, the energy supply of the boiler is obviously insufficient when the set climbs fast, the insufficient steam yield response rate of the boiler is the root cause for limiting the variable load rate of the coal-fired power generator set, and the boiler additionally arranged in the coal-fired power plant boiler is mainly used for realizing thermoelectric decoupling of the coal-fired power generator set at present.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a subcritical boiler high-temperature water working medium collaborative furnace internal fast powder feeding and reinforcing energy supply system which is used for solving the problem that the variable load response rate of a unit cannot be fast improved in the prior art.
To achieve the above and other related objects, the present invention provides the following technical solutions:
the utility model provides a subcritical boiler high temperature working medium is quick to give powder reinforcement energy supply system in stove in cooperation with the stove, includes: the control circulation loop is matched with the boiler and enables working medium to flow forcedly, and a steam drum is arranged on the control circulation loop;
further comprises: the high-temperature water working medium energy storage device is provided with a high-temperature resistant and pressure-bearing structure; a steam charging branch which is provided with a valve II and is connected with a steam pipeline at the steam outlet of the steam drum and is used for introducing high-temperature and high-pressure steam (overheated or saturated) at the steam outlet of the steam drum into the high-temperature water working medium energy storage device when the valve II is opened; a steam energy release branch which is provided with a valve III, is connected with a steam pipeline at the steam outlet of the steam drum and is used for leading high-temperature and high-pressure steam released in the energy release process of the high-temperature working medium energy storage device to the superheater when the valve III is opened; the pulverized coal reinforced supply pipeline is sequentially provided with a coal mill, a separator, a pulverized coal bin, a screw feeder, a blower and a burner.
In an embodiment of the invention, the control circulation loop is further provided with a down pipe, an intermediate header, a circulation pump, a mixing header and a water cooling wall in sequence, the water outlet of the steam drum is connected with the water inlet side of the intermediate header through the down pipe, two ports of the circulation pump are respectively connected with the water outlet side of the intermediate header and the water inlet side of the mixing header, and the water outlet side of the mixing header is communicated with the water cooling wall.
In an embodiment of the present invention, the high temperature water working medium energy storage device is provided with a safety valve, a liquid level meter, a thermometer and a pressure gauge, and the safety valve, the liquid level meter, the thermometer and the pressure gauge are all connected with an automatic control system through wires or a network.
In an embodiment of the invention, the device further comprises a water feeding pipeline connected with the steam drum, the water feeding pipeline is sequentially provided with a water feeding pump and an economizer, the water outlet end of the water feeding pump is connected with the water inlet of the steam drum through the economizer, and the water feeding pump in the technical scheme can inject chemical water at a high adding position into the steam drum or the high-temperature water working medium heat storage device.
In an embodiment of the invention, the water supply system further comprises a water supply branch which is provided with a valve I and is connected with the water supply pipeline, and when the valve I is opened, boiler water is introduced into the high-temperature water working medium energy storage device, and the water inlet end of the water supply branch is connected with the water outlet end of the water supply pump.
In an embodiment of the invention, the energy storage device further comprises a water energy release branch which is provided with a valve IV and a check valve, is connected with the water inlet side of the mixing header on the control circulation loop, and is used for mixing high-temperature water in the high-temperature water working medium energy storage device with undersaturated water at the water outlet of the circulating pump through the mixing header when the valve IV is opened and then introducing the mixed water into the water wall.
In an embodiment of the invention, the superheater is arranged on the steam energy release branch, the steam inlet end of the steam energy charging branch is connected with a steam pipeline at the steam outlet of the steam drum through the superheater, and the steam outlet of the steam energy release branch is communicated with the steam turbine.
In one embodiment of the invention, the outlet of the coal mill is communicated with a first coal powder nozzle of a combustor through a first coal powder conveying pipeline, the combustor is positioned in a boiler furnace, and the outlet of the coal mill is communicated with the inlet of the separator; the exhaust gas outlet of the separator is communicated with the secondary air nozzle of the burner, the coal dust outlet of the separator is communicated with the inlet of the coal dust bin, the outlet of the coal dust bin is communicated with the inlet of the screw feeder, the outlet of the screw feeder is communicated with the second coal dust nozzle of the burner through a second coal dust conveying pipeline, and the screw feeder is also communicated with the air feeder.
As described above, the subcritical boiler high-temperature water working medium cooperated with the in-furnace rapid powder feeding and reinforcing energy supply system has the following beneficial effects: according to the invention, part of high-temperature high-pressure steam heat energy in high-load operation of the boiler can be stored in the high-temperature water working medium energy storage device in the form of the high-temperature water working medium (the enthalpy value of the high-temperature water working medium energy storage device is higher than that of the inlet working medium of the water-cooled wall of the boiler in low-load operation of the boiler), saturated steam and high-temperature water under response pressure can be directly and rapidly provided for the boiler through the high-temperature water working medium energy storage device when the low-load section of the unit needs to climb rapidly, so that the steam yield response rate of the boiler can be directly and rapidly improved (without a heat exchange process, the high-enthalpy working medium in the high-temperature water working medium energy storage device can be directly and internally provided with a circulating water system of the boiler), and the problem that the response rate of the steam yield is slow due to heat transfer delay and heat accumulation of the metal of the heated surface of the boiler in a variable load period can be effectively solved.
Drawings
Fig. 1 is an overall schematic diagram of a subcritical boiler high-temperature water working medium collaborative furnace rapid powder feeding and reinforcing energy supply system disclosed in an embodiment of the invention.
Description of element reference numerals
1. A water feed pump; 2. a water supply line; 3. an economizer; 4. a steam energy release branch; 5. a steam charging branch; 6. a steam drum; 7. a superheater; 8. a valve I; 9. a water supply branch; 10. a high-temperature water working medium energy storage device; 11. a safety valve; 12. a third valve; 13. a second valve; 14. a down pipe; 15. an intermediate header; 16. a control circulation loop; 17. a circulation pump; 18. a valve IV; 19. a water energy release branch; 20. a check valve; 21. mixing a header; 22. a water cooling wall; 23. a burner; 24. a second pulverized coal conveying pipeline; 25. a separator; 26. a coal dust bin; 27. a screw feeder; 28. a coal mill; 29. a blower; 30. a pulverized coal-reinforcing supply line; 31. a first pulverized coal transport line; 32. a boiler.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Referring to fig. 1, the present invention provides a fast powder feeding and strengthening energy supply system in a subcritical boiler high temperature water working medium cooperation furnace, comprising: the control circulation loop 16 which is matched with the boiler 32 and enables working medium to forcedly flow is provided with a steam drum 6, the control circulation loop 16 is also provided with a down pipe 14, an intermediate header 15, a circulation pump 17, a mixing header 21 and a water cooling wall 22 in sequence, a water outlet of the steam drum 6 is connected with a water inlet side of the intermediate header 15 through the down pipe 14, two ports of the circulation pump 17 are respectively connected with a water outlet side of the intermediate header 15 and a water inlet side of the mixing header 21, a water outlet side of the mixing header 21 is communicated with the water cooling wall 22, and unsaturated water in the intermediate header 15 can be injected into the mixing header 21 through the circulation pump 17.
Further comprises: the high-temperature water working medium energy storage device 10 is provided with a high-temperature-resistant and pressure-bearing structure, the high-temperature water working medium energy storage device 10 is provided with a safety valve 11, a liquid level meter, a thermometer and a pressure meter, and the safety valve 11, the liquid level meter, the thermometer and the pressure meter are all connected with an automatic control system through wires or a network, wherein the automatic control system is an automatic control system installed at a terminal equipment manufacturer, and an operator can control a subcritical boiler high-temperature water working medium collaborative furnace through the automatic control system on the terminal equipment to supply powder to the powder strengthening energy supply system rapidly.
Further comprises: the water supply pipeline 2 of the steam drum 6 is connected, the water supply pipeline 2 is sequentially provided with a water supply pump 1 and an economizer 3, the water outlet end of the water supply pump 1 is connected with the water inlet of the steam drum 6 through the economizer 3, chemical water at a high-pressure position can be injected into the steam drum 6 or the high-temperature water working medium heat storage device 10 through the water supply pump 1, the water supply pipeline 2 further comprises a water supply branch 9 which is provided with a valve I8 and is connected with the water supply pipeline 2 and used for leading boiler water into the high-temperature water working medium heat storage device 10 when the valve I8 is opened, the water inlet end of the water supply branch 9 is connected with the water outlet end of the water supply pump 1, in the technical scheme, the valve I8 can control the water supply branch 9 to be conducted and not conducted, and the water release energy 19 which is provided with a valve IV 18 and a check valve 20 and is connected with the water inlet side of a mixing header 21 on a control circulation loop 16 and used for leading high-temperature water in the high-temperature water working medium storage device 10 to a water wall 22 after the mixing header 21 is mixed with saturated water at the water outlet of the circulation pump 17 when the valve IV 18 is opened;
a second valve 13 is arranged, is connected with a steam pipeline at the steam outlet of the steam drum 6, and when the second valve 13 is opened, high-temperature and high-pressure steam (superheated or saturated) at the steam outlet of the steam drum 6 is introduced into a steam charging branch 5 in the high-temperature water working medium energy storage device 10; the steam release energy branch 4 is provided with a valve III 12, is connected with a steam pipeline at the steam outlet of the steam drum 6, and when the valve III 12 is opened, high-temperature high-pressure steam released in the energy release process of the high-temperature water working medium energy storage device 10 is led into the superheater 7, the superheater 7 is arranged on the steam release energy branch 4, the steam inlet end of the steam charging branch 5 is connected with the steam pipeline at the steam outlet of the steam drum 6 through the superheater 7, the steam outlet of the steam release energy branch 4 is communicated with a steam turbine, and the high-temperature high-pressure steam released in the energy release process of the high-temperature water working medium energy storage device 10 and the high-temperature high-pressure steam released by the steam outlet of the steam drum 6 can be superheated through the superheater 7;
the coal dust strengthening supply pipeline 30, the coal dust strengthening supply pipeline 30 is sequentially provided with a coal mill 28, a separator 25, a coal dust bin 26, a screw feeder 27, a blower 29 and a combustor 23, the outlet of the coal mill 28 is communicated with a first coal dust nozzle of the combustor 23 through a first coal dust conveying pipeline 31, the combustor 23 is positioned in a boiler furnace, and the outlet of the coal mill 28 is communicated with the inlet of the separator 25; the exhaust gas outlet of the separator 25 is communicated with the secondary air nozzle of the burner 23, the pulverized coal outlet of the separator 25 is communicated with the inlet of the pulverized coal bin 26, the outlet of the pulverized coal bin 26 is communicated with the inlet of the screw feeder 27, the outlet of the screw feeder 27 is communicated with the second pulverized coal nozzle of the burner 23 through the second pulverized coal conveying pipeline 24, and the screw feeder 27 is also communicated with the blower 29.
In addition, the water supply branch 9 can also be connected with the down pipe 14 to introduce high-temperature and high-pressure undersaturated water under the high-load operation condition of the boiler 32 into the high-temperature water working medium heat storage device 10; the water supply branch 9 can also be connected with an outlet pipeline of the condensation water tank to introduce condensation water into the high-temperature water working medium heat storage device 10; the steam charging branch 5 can also be connected with an outlet pipeline of the random-stage superheater 7 to introduce superheated steam into the high-temperature water working medium heat storage device 10; the flow of the working medium additionally supplied by the high-temperature water working medium energy storage device 10 is controlled by the opening of a valve III 12 of the steam energy release branch 4 and the opening of a valve IV 18 of the water energy release branch 19, and the opening of the valve III 12 and the opening of the valve IV 18 are also automatically controlled by an automatic control system according to a preset curve; the flow rate of the pulverized coal additionally supplied by the pulverized coal bin 26 is controlled by the rotating speed of the screw feeder 27, the rotating speed of the screw feeder 27 is automatically controlled by an automatic control system according to a preset curve, the automatic control system can also automatically adjust the rotating speed of the water feeding pump 1 and the coal feeding amount of the coal mill 28 according to the supply amount of the additional working medium and the additional pulverized coal, matching coordination of unit fuel and the working medium is ensured in real time, the combustor 23 is a high pulverized coal density concentrated-phase pulverized coal combustor 23, and the combustion uniformity and stability of the boiler 32 under the working conditions of low load and rapid load change are realized.
Further, when the unit is in a high-load working condition, the subcritical boiler high-temperature water working medium cooperates with the powder supply and reinforcement energy supply system in the furnace to be in an energy charging stage: the valve II 13 is in a closed state, the valve I8 is opened, a certain amount of boiler feed water is filled into the high-temperature water working medium energy storage device 10 under the action of the feed water pump 1, when the boiler feed water reaches a set water level, the valve I8 is closed, the valve II 13 is opened, high-temperature and high-pressure steam in the steam drum 6 is overheated through the superheater 7 and enters the steam energy charging branch 5, then the high-temperature and high-pressure steam is stored into the high-temperature water working medium energy storage device 10 through the steam energy charging branch 5, at the moment, the temperature and the pressure of the high-temperature water working medium energy storage device 10 are increased, when the temperature of the high-temperature water working medium energy storage device 10 is increased to a set value, the valve II 13 is closed, at the moment, the charging of the high-temperature water working medium energy storage device 10 is completed, and the high-temperature water working medium energy storage device is in a standby state; when the powder bin 26 is in a powder-free state, if the unit is in a low-load or medium-low-load working condition (when the coal mill 28 supplies powder for the powder bin), the separator 25 separates the primary air powder at the outlet of the coal mill 28 from the coal dust and the exhaust gas (a small amount of fine coal dust), the coal dust enters the powder bin 26, and the exhaust gas enters the hearth of the boiler 32 through the secondary air nozzle on the combustor 23.
Further, when the unit is in the medium and high load working condition, the subcritical boiler high temperature working medium cooperates with the powder supply and reinforcement energy supply system in the furnace to be in the heat preservation stage: the automatic control system monitors the temperature of the working medium in the high-temperature water working medium energy storage device 10 on line, when the temperature of the working medium in the high-temperature water working medium energy storage device 10 is 10-15 ℃ lower than the saturation temperature corresponding to the set pressure value, the valve II 13 is opened to introduce high-temperature high-pressure steam for energy charging, and when the pressure of the working medium in the high-temperature water working medium energy storage device 10 reaches the set pressure value again, the valve II 13 is closed.
Furthermore, when the unit needs to be rapidly changed in load and started in an emergency cold state or a hot state, a subcritical boiler high-temperature working medium cooperates with a rapid powder feeding and reinforcing energy supply system in the furnace to be in an energy release stage: the blower 29 and the screw feeder 27 are respectively started to feed the pulverized coal in the pulverized coal bin 26 into a second pulverized coal nozzle of the combustor 23 through a second pulverized coal conveying pipeline 24; the valve III 12 and the valve IV 18 are in an open state, the high-temperature and high-pressure steam released in the energy release process of the high-temperature water working medium energy storage device 10 and the high-temperature and high-pressure steam at the outlet of the steam drum 6 are mixed and then are overheated by the superheater 7 and then are introduced into the steam turbine to do work, the high-enthalpy water released in the energy release process of the high-temperature water working medium energy storage device 10 is mixed with the undersaturated water at the outlet of the circulating pump 17 by the mixing header 21 and then is introduced into the water cooling wall 22, and meanwhile, the coal mill 28 always sends the coal dust into the first coal dust nozzle of the combustor 23 by the first coal dust conveying pipeline 31, so that the unit needs to be started in a rapid load changing and an emergency cold state or a hot state, and the blower 29 and the screw feeder 27 need to be additionally started.
Furthermore, aiming at a certain 600 MW-level subcritical unit, taking a constant 5% rated load/min load-lifting rate rapid load-changing working condition as a calculation case in a 20% -100% load interval, taking into consideration constraint conditions of the existing pulverizing system characteristic of the unit, the working medium circulation system characteristic, the matching of fuel quantity and working medium quantity and the like, wherein the volume of the high-temperature water working medium heat storage device 10 is about 50-150 m < 3 >, and the working medium parameters are 17MPa and 350 ℃; the volume of the pulverized coal bin 26 is about 80-120 m3, the coal storage capacity is about 55-83 t (according to different coal quality heat values, the powder bin reserves are different), because the high-enthalpy water working medium heat storage device 10 stores high-temperature water working medium (high temperature and high pressure), the energy charging and releasing processes of the high-temperature furnace water energy storage device are required to be carried out regularly according to the unit load operation condition, the high-temperature water working medium heat storage device 10 is ensured to be always in a usable state and a higher temperature level, the unit boiler 32 has quick load changing response capability at any time, and the energy supply new system is required to adjust parameters such as fuel flow, working medium flow, steam pressure, container liquid level and the like in a quick load changing period in real time, so that the response capability and response speed are required to be high, and the corresponding control system and control strategy are required to be matched, so that the real-time adjustment and control of the energy supply new system are realized.
According to the invention, part of high-temperature high-pressure steam heat energy in the high-temperature water energy storage device (10) can be stored in the high-temperature water energy storage device in a high-temperature water mode when the boiler (32) operates under high load (the enthalpy value of the high-temperature water energy storage device is higher than the enthalpy value of the water-cooled wall of the boiler under low load), saturated steam and high-temperature water under response pressure can be directly and rapidly provided for the boiler (32) through the high-temperature water energy storage device (10) when the unit is required to climb a slope rapidly, so that the steam yield response rate of the boiler (32) can be directly and rapidly improved (without a heat exchange process, the high-enthalpy value working medium in the high-temperature water energy storage device can be directly released into a boiler circulating water system) in a state of being released, and therefore, the problem that the heat transfer delay of the boiler (32) in a variable load period and the steam yield response rate of the heated surface metal heat storage are slow is effectively solved.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. It is intended that all equivalent modifications and variations of the invention be covered by the claims of this invention be accomplished by those of ordinary skill in the art without departing from the spirit and scope of the invention as disclosed herein.
Claims (8)
1. The utility model provides a subcritical boiler high temperature working medium is quick to give powder reinforcement energy supply system in stove in cooperation with the stove, includes:
a control circulation loop (16) which is matched with the boiler (32) and makes working medium forcedly flow, wherein a steam drum (6) is arranged on the control circulation loop (16);
characterized by further comprising:
the high-temperature working medium energy storage device (10) is provided with a high-temperature resistant and pressure-bearing structure;
a second valve (13) is arranged, is connected with a steam pipeline at the steam outlet of the steam drum (6), and when the second valve (13) is opened, high-temperature and high-pressure steam at the steam outlet of the steam drum (6) is introduced into a steam charging branch (5) in the high-temperature water working medium energy storage device (10);
a steam energy release branch (4) which is provided with a valve III (12), is connected with a steam pipeline at the steam outlet of the steam drum (6) and is used for leading high-temperature and high-pressure steam released in the energy release process of the high-temperature water working medium energy storage device (10) into the superheater (7) when the valve III (12) is opened;
the pulverized coal reinforced supply pipeline (30), wherein the pulverized coal reinforced supply pipeline (30) is sequentially provided with a coal mill (28), a separator (25), a pulverized coal bin (26), a screw feeder (27), a blower (29) and a combustor (23).
2. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the control circulation loop (16) is further provided with a down pipe (14), an intermediate header (15), a circulation pump (17), a mixing header (21) and a water cooling wall (22) in sequence, a water outlet of the steam drum (6) is connected with a water inlet side of the intermediate header (15) through the down pipe (14), two ports of the circulation pump (17) are respectively connected with a water outlet side of the intermediate header (15) and a water inlet side of the mixing header (21), and a water outlet side of the mixing header (21) is connected with the water cooling wall (22).
3. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the high-temperature water working medium energy storage device (10) is provided with a safety valve (11), a liquid level meter, a thermometer and a pressure meter, and the safety valve (11), the liquid level meter, the thermometer and the pressure meter are all connected with an automatic control system through wires or a network.
4. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the water supply device is characterized by further comprising a water supply pipeline (2) communicated with the steam drum (6), wherein the water supply pipeline (2) is sequentially provided with a water supply pump (1) and an economizer (3), and the water outlet end of the water supply pump (1) is communicated with the water inlet of the steam drum (6) through the economizer (3).
5. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the water supply system further comprises a water supply branch (9) which is provided with a valve I (8), is connected with the water supply pipeline (2) and is used for introducing boiler water into the high-temperature water working medium energy storage device (10) when the valve I (8) is opened, and the water inlet end of the water supply branch (9) is connected with the water outlet end of the water supply pump (1).
6. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the energy-saving device also comprises a water energy release branch (19) which is provided with a valve IV (18) and a check valve (20), is connected with the water inlet side of the mixing header (21) on the control circulation loop (16) and is used for mixing high-temperature water in the high-temperature water working medium energy storage device (10) with undersaturated water at the water outlet of the circulating pump (17) through the mixing header (21) when the valve IV (18) is opened and then introducing the undersaturated water into the water cooling wall (22).
7. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the superheater (7) is arranged on the steam energy release branch (4), the steam inlet end of the steam energy charging branch (5) is connected with a steam pipeline at the steam outlet of the steam drum (6) through the superheater (7), and the steam outlet of the steam energy release branch (4) is communicated with the steam turbine.
8. The subcritical boiler high-temperature water working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system is characterized in that: the outlet of the coal mill (28) is communicated with a first coal powder nozzle of the combustor (23) through a first coal powder conveying pipeline (31), the combustor (23) is positioned in a boiler furnace, the outlet of the coal mill (28) is communicated with the inlet of the separator (25), and the exhaust gas outlet of the separator (25) is communicated with a secondary air nozzle of the combustor (23);
the coal dust outlet of the separator (25) is communicated with the inlet of the coal dust bin (26), the outlet of the coal dust bin (26) is communicated with the inlet of the screw feeder (27), the outlet of the screw feeder (27) is communicated with a second coal dust nozzle of the combustor (23) through a second coal dust conveying pipeline (24), and the screw feeder (27) is also communicated with the air feeder (29).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311862493.5A CN117803943A (en) | 2023-12-29 | 2023-12-29 | Subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311862493.5A CN117803943A (en) | 2023-12-29 | 2023-12-29 | Subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system |
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| CN117803943A true CN117803943A (en) | 2024-04-02 |
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| CN202311862493.5A Pending CN117803943A (en) | 2023-12-29 | 2023-12-29 | Subcritical boiler high-temperature working medium cooperated in-furnace rapid powder feeding and reinforcing energy supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118463685A (en) * | 2024-07-11 | 2024-08-09 | 上海交通大学 | Heat storage device, energy supply system and method for rapidly increasing load of coal-fired power generation unit |
| CN118482381A (en) * | 2024-07-15 | 2024-08-13 | 上海交通大学 | Coal-fired unit peak regulation system based on fuel side and high enthalpy working medium energy storage and supply device |
-
2023
- 2023-12-29 CN CN202311862493.5A patent/CN117803943A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118463685A (en) * | 2024-07-11 | 2024-08-09 | 上海交通大学 | Heat storage device, energy supply system and method for rapidly increasing load of coal-fired power generation unit |
| CN118482381A (en) * | 2024-07-15 | 2024-08-13 | 上海交通大学 | Coal-fired unit peak regulation system based on fuel side and high enthalpy working medium energy storage and supply device |
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