CN115199349A - Coal-fired power generation system with coupled steam energy storage and operation method - Google Patents
Coal-fired power generation system with coupled steam energy storage and operation method Download PDFInfo
- Publication number
- CN115199349A CN115199349A CN202210980571.0A CN202210980571A CN115199349A CN 115199349 A CN115199349 A CN 115199349A CN 202210980571 A CN202210980571 A CN 202210980571A CN 115199349 A CN115199349 A CN 115199349A
- Authority
- CN
- China
- Prior art keywords
- steam
- coal
- storage tank
- outlet
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 36
- 238000010248 power generation Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 238000000605 extraction Methods 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 229940123973 Oxygen scavenger Drugs 0.000 claims 1
- 230000008859 change Effects 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
Images
Classifications
-
- 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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a coal-fired power generation system for coupling steam energy storage and an operation method thereof, belonging to the technical field of coal-fired power generation, and the coal-fired power generation system for coupling steam energy storage comprises: coal-fired power generation subassembly, coal-fired power generation subassembly is including the intercommunication setting: the system comprises a coal-fired boiler, a high-pressure turbine, a medium-pressure turbine, a low-pressure turbine, a condenser, a deaerator and a high-pressure heater; a steam energy storage assembly, the steam energy storage assembly comprising: a gas storage tank; the coal-fired power generation system coupled with the steam energy storage improves the peak load and frequency modulation capability of the coal-fired unit.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation, in particular to a coal-fired power generation system coupled with steam energy storage and an operation method.
Background
With the global rapid increase of the utilization of renewable energy sources such as solar energy, wind energy and the like, the characteristics of volatility, intermittence, unpredictability and the like bring great challenges to the stable and safe operation of a power grid.
In the prior art, the minimum stable combustion load restricts the peak shaving capacity of a boiler system, and the large thermal inertia inside the boiler restricts the frequency modulation capacity of the boiler system, so that the peak shaving and frequency modulation capacities of a coal-fired unit cannot meet the requirements of a power grid.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the peak load regulation and frequency regulation capability of a coal-fired unit in the prior art cannot meet the requirement of a power grid, so that a coal-fired power generation system coupled with steam energy storage is provided.
The invention also provides an operation method of the coal-fired power generation system coupled with the steam energy storage.
In order to solve the technical problem, the invention provides a coal-fired power generation system with coupled steam energy storage, which comprises:
coal-fired power generation subassembly, coal-fired power generation subassembly is including the intercommunication setting: the system comprises a coal-fired boiler, a high-pressure turbine, a medium-pressure turbine, a low-pressure turbine, a condenser, a deaerator, a high-pressure heater and a low-pressure heater;
the steam inlet of the high-pressure steam turbine is communicated with the steam outlet of the coal-fired boiler; the steam outlet of the high-pressure turbine is communicated with the steam inlet of the medium-pressure turbine through a coal-fired boiler; a first-stage steam extraction outlet of the medium-pressure steam turbine is communicated with a steam inlet of the high-pressure heater; a second-stage steam outlet of the medium-pressure steam turbine is communicated with a steam inlet of the deaerator;
the steam outlet of the medium pressure turbine is communicated with the steam outlet of the low pressure turbine through a pipeline; the steam extraction outlet of the low-pressure turbine is communicated with the low-pressure heater; the steam outlet of the low-pressure turbine is communicated with the steam inlet of the condenser through a pipeline; a condensed water outlet of the condenser is communicated with a condensed water inlet of the low-pressure heater through a pipeline; a condensed water outlet of the low-pressure heater is connected with a condensed water inlet of the deaerator through a pipeline; the feed water outlet of the deaerator is communicated with the feed water inlet of the high-pressure heater through a pipeline; the feed water outlet of the high-pressure heater is communicated with the feed water inlet of the coal-fired boiler through a pipeline;
a steam energy storage assembly, the steam energy storage assembly comprising: a gas storage tank;
the steam inlet of the steam storage tank is communicated with the main steam outlet of the coal-fired boiler; a steam inlet of the steam storage tank is communicated with a reheat steam outlet of the coal-fired boiler; the water medium inlet of the steam storage tank is communicated with the water medium outlet of the deaerator; the steam outlet of the steam storage tank is communicated with the steam inlet of the high-pressure heater; the steam outlet of the steam storage tank is communicated with the steam inlet of the deaerator; the steam outlet of the steam storage tank is communicated with the steam inlet of the low-pressure turbine; the steam outlet of the steam storage tank is communicated with the steam inlet of the low-pressure heater.
As a preferred scheme, a main steam flow dividing valve is arranged between a steam inlet of the gas storage tank and a main steam outlet of the coal-fired boiler; and a reheat steam shunt valve is arranged between a steam inlet of the gas storage tank and a reheat steam outlet of the coal-fired boiler.
Preferably, a water supply flow dividing valve and a water supply pump are arranged between the water medium inlet of the steam storage tank and the water medium outlet of the deaerator.
Preferably, an outlet regulating valve is arranged at the outlet of the steam storage tank.
Preferably, a first flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the high-pressure heater;
a second flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the deaerator;
a third flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the low-pressure turbine;
and a fourth flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the low-pressure heater.
As a preferred scheme, the steam storage tank is a pressure-bearing steam storage tank; the pressure of the compressed steam in the steam storage tank is more than or equal to 70 Pa.
Preferably, the steam temperature at the outlet of the reheating steam of the coal-fired boiler is higher than 520 ℃, and the pressure is higher than 20 Pa; the steam temperature at the steam outlet of the coal-fired boiler is higher than 520 ℃, and the pressure is higher than 100 Pa.
The invention also provides an operation method of the coal-fired power generation system by coupling steam energy storage, which comprises the following steps:
when the load of the coal-fired unit is reduced, the steam shunting part of the coal-fired boiler enters a gas storage tank;
when the load of the coal-fired unit is increased, high-pressure steam in the steam storage tank is released from the steam storage tank.
As a preferred scheme, when the load of the coal-fired unit needs to be reduced, the reheat steam shunt valve is opened firstly, and the shunt part of reheat steam enters the steam storage tank;
opening a feed water flow divider valve, starting a feed water pump, and enabling part of feed water to enter a steam storage tank after being boosted by the feed water pump to be mixed with superheated steam to form saturated water;
gradually closing the reheat steam shunt valve and gradually opening the main steam shunt valve according to the unit requirements; adjusting a feed water diverter valve;
when the pressure in the steam storage tank is close to the pressure of reheat steam, closing the reheat steam shunt valve, opening the main steam shunt valve, and enabling a part of main steam to enter the steam storage tank;
when the pressure in the steam storage tank is more than 70 Pa, closing the main steam shunt valve, the water supply pump and the water supply shunt valve;
when the unit is operated under a high load, the outlet regulating valve of the steam storage tank is opened to release high-pressure steam from the steam storage tank, the steam extraction throttle valve of the second medium-pressure steam turbine and the first steam outlet shunt valve are opened,
the high-pressure steam heats the feed water of the high-pressure heater, and the first flow dividing valve, the second flow dividing valve, the third flow dividing valve, the fourth flow dividing valve and the first medium-pressure turbine steam extraction throttle valve are gradually opened in sequence along with the reduction of the pressure in the steam storage tank.
The technical scheme of the invention has the following advantages:
1. the invention provides a coal-fired power generation system with coupled steam energy storage, which comprises a coal-fired power generation assembly and a steam energy storage assembly; the steam energy storage component and the coal-fired power generation component are coupled, so that the load change interval of the coal-fired unit is expanded; its minimum load can be maximally reduced from 30% tha to 21% tha, maximum load is maximally increased from 100% tha to 115% tha, the rate of load variation of the coal-fired unit can be increased from conventional 1-1.5pe0/min to 3.5pe0/min, greatly increasing the peak-shaving frequency modulation capability of the coal-fired unit;
furthermore, with coal-fired power generation subassembly and the coupling of steam energy storage subassembly, it is little to the coal-fired boiler influence, need not reform transform the boiler, can directly utilize steam, need not additionally to increase the heat exchanger.
2. The invention provides a coal-fired power generation system with coupled steam energy storage, wherein a water feeding pump is arranged between a steam storage tank and a deaerator; the water feeding pump is used for boosting the water fed into the steam storage tank, so that the water feeding and the superheated steam are mixed into saturated water, the heat storage density is greatly increased, and the floor area of the steam storage tank is reduced.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a coal-fired power generation system coupled with steam energy storage according to the present invention.
Description of reference numerals:
1. a coal-fired boiler; 2. a high pressure turbine; 3. a medium pressure turbine; 4. a low pressure turbine; 5. a condenser; 6. a low pressure turbine extraction throttle valve; 7. a low pressure heater; 8. a first intermediate pressure turbine extraction throttle valve; 9. a deaerator; 10. a second intermediate pressure turbine extraction throttle valve; 11. a high pressure heater; 12. a main steam diverter valve; 13. a reheat steam shunt valve; 14. a steam storage tank; 15. a feed water diverter valve; 16. a feed pump; 17. an outlet regulating valve; 18. a first diverter valve; 19. a second flow dividing valve; 20. a third diverter valve; 21. a fourth diverter valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The present embodiment provides a coal-fired power generation system coupled with steam energy storage, as shown in fig. 1, including: the coal-fired power generation assembly and the steam energy storage assembly;
the steam inlet of the high-pressure steam turbine 2 is communicated with the steam outlet of the coal-fired boiler 1; the steam outlet of the high-pressure turbine 2 is communicated with the steam inlet of the medium-pressure turbine 3 through the coal-fired boiler 1; a first-stage steam extraction outlet of the medium-pressure turbine 3 is communicated with a steam inlet of the high-pressure heater 11; a second-stage steam outlet of the medium-pressure steam turbine 3 is communicated with a steam inlet of the deaerator 9; the steam outlet of the medium pressure turbine 3 is communicated with the steam outlet of the low pressure turbine through a pipeline; the steam extraction outlet of the low-pressure turbine 4 is communicated with a low-pressure heater 7; a steam outlet of the low-pressure turbine is communicated with a steam inlet of the condenser 5 through a pipeline; a condensed water outlet of the condenser is communicated with a condensed water inlet of the low-pressure heater 7 through a pipeline; a condensed water outlet of the low-pressure heater 7 is connected with a condensed water inlet of the deaerator 9 through a pipeline; the feed water outlet of the deaerator 9 is communicated with the feed water inlet of the high-pressure heater 11 through a pipeline; the feed water outlet of the high-pressure heater 11 is communicated with the feed water inlet of the coal-fired boiler 1 through a pipeline.
The steam inlet of the steam storage tank 14 is communicated with the main steam outlet of the coal-fired boiler 1; the steam inlet of the steam storage tank 14 is communicated with the reheat steam outlet of the coal-fired boiler 1; the water working medium inlet of the steam storage tank 14 is communicated with the water working medium outlet of the deaerator 9; the steam outlet of the steam storage tank 14 is communicated with the steam inlet of the high-pressure heater 11; the steam outlet of the steam storage tank 14 is communicated with the steam inlet of the deaerator 9; the steam outlet of the steam storage tank 14 is communicated with the steam inlet of the low-pressure turbine; the steam outlet of the steam storage tank 14 is communicated with the steam inlet of the low-pressure heater 7.
Wherein the steam turbine is a supercritical straight condensing steam turbine; the steam inlet of the high-pressure steam turbine 2 is communicated with the main steam outlet of the coal-fired boiler 1 through a pipeline; the steam outlet of the high-pressure steam turbine 2 is communicated with the inlet of a reheating loop of the coal-fired boiler 1, and the outlet of the reheating loop of the coal-fired boiler 1 is communicated with the steam inlet of the medium-pressure steam turbine; the steam extraction outlet of the high pressure turbine 2 is communicated with the steam inlet of the high pressure heater 11 through a pipeline; a first-stage steam extraction outlet of the medium pressure turbine is communicated with a steam inlet of the high pressure heater 11, and a second medium pressure turbine steam extraction throttle valve 10 is arranged on a pipeline communicated between the medium pressure turbine and the high pressure heater 11; a second-stage steam extraction outlet of the medium-pressure turbine is communicated with a steam inlet of a deaerator 9 through a pipeline, and a first medium-pressure turbine steam extraction throttle valve 8 is arranged on the pipeline communicated between the medium-pressure turbine and the deaerator 9;
the extraction outlet of the low pressure turbine is communicated with the low pressure heater 7 through a pipeline, and a low pressure turbine extraction throttle valve 6 is arranged on the pipeline communicated between the low pressure turbine 4 and the low pressure heater 7; the steam outlet of the low-pressure turbine is communicated with the steam inlet of the condenser through a pipeline; a condensed water outlet of the condenser is communicated with a condensed water inlet of the low-pressure heater 7 through a pipeline; a condensed water outlet of the low-pressure heater 7 is connected with a condensed water inlet of the deaerator 9 through a pipeline; the feed water outlet of the deaerator 9 is communicated with the feed water inlet of the high-pressure heater 11 through a pipeline; the feed water outlet of the high-pressure heater 11 is communicated with the feed water inlet of the coal-fired boiler 1 through a pipeline.
A steam inlet of the steam storage tank 14 is communicated with a main steam outlet of the coal-fired boiler 1 through a pipeline, and a main steam flow dividing valve 12 is arranged between the gas storage tank and the main steam outlet of the coal-fired boiler 1;
a steam inlet of the gas storage tank is communicated with a reheat steam outlet of the coal-fired boiler 1 through a pipeline, and a reheat steam shunt valve 13 is arranged on the pipeline between the gas storage tank and the reheat steam outlet of the coal-fired boiler 1;
the water medium inlet of the steam storage tank 14 is communicated with the water medium outlet of the deaerator 9 through a pipeline; a feed water diverter valve 15 and a feed water pump 16 are arranged between the steam storage tank 14 and the deaerator 9; an outlet regulating valve 17 is arranged on the steam outlet of the steam storage tank 14;
further, a first flow dividing valve 18 is provided between the steam outlet of the steam storage tank 14 and the steam inlet of the high pressure heater 11; a second flow dividing valve 19 is arranged between the steam outlet of the steam storage tank 14 and the steam inlet of the deaerator 9; a third diverter valve 20 is provided between the steam outlet of the steam storage tank 14 and the steam inlet of the low pressure turbine; a fourth diverter valve 21 is provided between the steam outlet of the steam storage tank 14 and the steam inlet of the low pressure heater 7.
The steam storage tank 14 is a pressure-bearing steam storage tank 14, the number of the steam storage tanks 14 can be one or more, and the pressure of the compressed steam in the steam storage tank 14 is not lower than 70 Pa;
furthermore, the temperature of main steam in the coal-fired boiler 1 is higher than 520 ℃, the pressure is higher than 100 Pa, the temperature of reheat steam is higher than 520 ℃, and the pressure is higher than 20 Pa.
Further, the pressure of the feed water entering the steam storage tank 14 through the feed water diverter valve 15 and the feed water pump 16 is not lower than 70 Pa.
Example 2
The embodiment provides an operation method of a coal-fired power generation system for coupling steam energy storage, which comprises the following steps:
when the load of the coal-fired unit is reduced, the steam shunting part of the coal-fired boiler 1 enters the gas storage tank;
when the coal-fired unit is under increased load, the high pressure steam in the steam storage tank 14 is released from the steam storage tank 14.
Further, when the load of the coal-fired unit needs to be reduced, the reheat steam shunt valve 13 is opened firstly, and shunt part of the reheat steam enters the steam storage tank 14;
opening a feed water diverter valve 15, starting a feed water pump 16, boosting part of feed water by the feed water pump 16, and then entering a steam storage tank 14 to be mixed with superheated steam to form saturated water;
gradually closing the reheat steam shunt valve 13 and gradually opening the main steam shunt valve 12 according to the unit requirements; adjusting a feed water diverter valve 15;
when the pressure in the steam storage tank 14 is close to the pressure of the reheat steam, the reheat steam shunt valve 13 is closed, the main steam shunt valve 12 is opened, and a part of the main steam is shunted and enters the steam storage tank 14;
the flow rate of steam flowing into the steam storage tank 14 can be adjusted by adjusting the opening degrees of the main steam flow dividing valve 12 and the reheat steam and reheat steam flow dividing valve 13, so that the load reduction rate of the unit is adjusted and controlled;
the water supply flow entering the steam storage tank 14 is controlled by adjusting the opening of the water supply diverter valve 15, so that the water supply flow is matched with the steam flow, the superheated steam is guaranteed to be saturated water after being mixed with the water supply, and the heat storage density is improved.
When the pressure in the steam storage tank 14 is greater than 70 Pa, the main steam diverter valve 12, the feed pump 16 and the feed water diverter valve 15 are closed.
When the unit is operated under a high load, the outlet regulating valve 17 of the steam storage tank 14 is opened to release high-pressure steam from the steam storage tank 14, the second medium-pressure turbine steam extraction throttle valve 10, the first steam outlet diverter valve,
the high-pressure steam replaces the steam extraction of the steam turbine to heat the feed water of the high-pressure heater 11, and the first flow dividing valve 18, the second flow dividing valve 19, the third flow dividing valve 20, the fourth flow dividing valve 21 and the first medium-pressure steam turbine extraction throttle valve 8 are gradually opened along with the reduction of the pressure in the steam storage tank 14, so that the pressure of the steam at the outlet of the steam storage tank 14 is mainly matched with the steam pressure required by the release point of the steam turbine, and the steam utilization rate is improved.
Compared with the prior art, the scheme has the following advantages:
(1) Compared with the traditional coal-fired unit, the load change interval of the coal-fired unit is expanded by coupling the steam energy storage with the coal-fired unit. The minimum load can be reduced from 30% THA to 21% THA, the maximum load can be increased from 100% THA to 115% THA, the load change rate of the coal-fired unit can be increased from 1-1.5Pe0/min to 3.5Pe0/min, and the peak-load and frequency-modulation capacity of the coal-fired unit is greatly improved;
(2) The steam energy storage is coupled with the coal-fired unit, so that the coal-fired boiler is slightly influenced, the boiler is not required to be modified, the steam is directly utilized, and a heat exchanger is not required to be additionally arranged;
(3) The feed water entering the steam storage tank is pressurized by the feed water pump, so that the feed water and the superheated steam are mixed into saturated water, the heat storage density is greatly increased, and the floor area of the steam storage tank is reduced;
(4) When the unit is in load increase, high-pressure steam of the steam storage tank is released to the steam extraction of the steam turbine and the inlet of the low-pressure cylinder according to pressure gradient, the steam extraction of the steam turbine is replaced to heat feed water, the output power of the steam turbine is improved, meanwhile, the heat exchange irreversibility of a regenerative system is reduced, and the utilization efficiency of heat energy is further improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A coal-fired power generation system coupled with steam energy storage, comprising:
coal-fired power generation subassembly, coal-fired power generation subassembly is including the intercommunication setting: the system comprises a coal-fired boiler, a high-pressure turbine, a medium-pressure turbine, a low-pressure turbine, a condenser, a deaerator, a high-pressure heater and a low-pressure heater;
the steam inlet of the high-pressure steam turbine is communicated with the steam outlet of the coal-fired boiler; the steam outlet of the high-pressure turbine is communicated with the steam inlet of the medium-pressure turbine through a coal-fired boiler; a first-stage steam extraction outlet of the medium-pressure steam turbine is communicated with a steam inlet of the high-pressure heater; a second-stage steam outlet of the medium-pressure steam turbine is communicated with a steam inlet of the deaerator;
the steam outlet of the medium pressure turbine is communicated with the steam outlet of the low pressure turbine through a pipeline; the steam extraction outlet of the low-pressure turbine is communicated with the steam inlet of the low-pressure heater; the steam outlet of the low-pressure turbine is communicated with the steam inlet of the condenser through a pipeline; a condensed water outlet of the condenser is communicated with a condensed water inlet of the low-pressure heater through a pipeline; a condensed water outlet of the low-pressure heater is connected with a condensed water inlet of the deaerator through a pipeline; the feed water outlet of the deaerator is communicated with the feed water inlet of the high-pressure heater through a pipeline; the feed water outlet of the high-pressure heater is communicated with the feed water inlet of the coal-fired boiler through a pipeline;
a steam energy storage assembly, the steam energy storage assembly comprising: a steam storage tank;
the steam inlet of the steam storage tank is communicated with the main steam outlet of the coal-fired boiler; a steam inlet of the steam storage tank is communicated with a reheat steam outlet of the coal-fired boiler; the water medium inlet of the steam storage tank is communicated with the water medium outlet of the deaerator; the steam outlet of the steam storage tank is communicated with the steam inlet of the high-pressure heater; the steam outlet of the steam storage tank is communicated with the steam inlet of the deaerator; the steam outlet of the steam storage tank is communicated with the steam inlet of the low-pressure steam turbine; the steam outlet of the steam storage tank is communicated with the steam inlet of the low-pressure heater.
2. The coal-fired power generation system with coupled steam energy storage according to claim 1, characterized in that a main steam flow dividing valve is arranged between the steam inlet of the steam storage tank and the main steam outlet of the coal-fired boiler; and a reheat steam shunt valve is arranged between the steam inlet of the steam storage tank and the reheat steam outlet of the coal-fired boiler.
3. The coal-fired power generation system with coupled steam energy storage of claim 1, wherein a feed water diverter valve and a feed water pump are provided between the water medium inlet of the steam storage tank and the water medium outlet of the oxygen scavenger.
4. The coal-fired power generation system with coupled steam energy storage according to claim 1, characterized in that the outlet of the steam storage tank is provided with an outlet regulating valve.
5. The coal-fired power generation system with coupled steam energy storage according to claim 4, characterized in that a first flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the high-pressure heater;
a second flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the deaerator;
a third flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the low-pressure turbine;
and a fourth flow dividing valve is arranged between the steam outlet of the steam storage tank and the steam inlet of the low-pressure heater.
6. The coal-fired power generation system coupling steam energy storage according to claim 1, wherein the steam storage tank is a pressure-bearing steam storage tank; the pressure of the compressed steam in the steam storage tank is more than or equal to 70 Pa.
7. The coal-fired power generation system with coupled steam energy storage according to claim 1, characterized in that the steam temperature at the outlet of the reheat steam of the coal-fired boiler is more than 520 ℃ and the pressure is more than 20 Pa; the steam temperature at the steam outlet of the coal-fired boiler is higher than 520 ℃, and the pressure is higher than 100 Pa.
8. An operation method of a coal-fired power generation system for coupling steam energy storage is characterized by comprising the following steps:
when the load of the coal-fired unit is reduced, the steam shunting part of the coal-fired boiler enters a steam storage tank;
when the load of the coal-fired unit is increased, high-pressure steam in the steam storage tank is released from the steam storage tank.
9. The method for operating a coal-fired power generation system coupled with steam energy storage according to claim 8,
when the load of the coal-fired unit needs to be reduced, the reheat steam shunt valve is opened firstly, and the shunt part of reheat steam enters the steam storage tank;
opening a feed water flow divider valve, starting a feed water pump, and enabling part of feed water to enter a steam storage tank after being boosted by the feed water pump to be mixed with superheated steam to form saturated water;
gradually closing the reheat steam shunt valve and gradually opening the main steam shunt valve according to the unit requirement; adjusting a feed water diverter valve;
when the pressure in the steam storage tank is close to the pressure of the reheat steam, closing the reheat steam shunt valve, opening the main steam shunt valve, and enabling a part of the main steam to enter the steam storage tank;
when the pressure in the steam storage tank is more than 70 Pa, closing the main steam shunt valve, the water supply pump and the water supply shunt valve;
when the unit is operated with increased load, the outlet regulating valve of the steam storage tank is opened to release high-pressure steam from the steam storage tank, the steam extraction throttle valve of the second medium-pressure turbine and the first steam outlet shunt valve are opened,
the high-pressure steam heats the feed water of the high-pressure heater, and the first flow dividing valve, the second flow dividing valve, the third flow dividing valve, the fourth flow dividing valve and the first medium-pressure turbine steam extraction throttle valve are gradually opened in sequence along with the reduction of the pressure in the steam storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980571.0A CN115199349A (en) | 2022-08-16 | 2022-08-16 | Coal-fired power generation system with coupled steam energy storage and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980571.0A CN115199349A (en) | 2022-08-16 | 2022-08-16 | Coal-fired power generation system with coupled steam energy storage and operation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115199349A true CN115199349A (en) | 2022-10-18 |
Family
ID=83586304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210980571.0A Pending CN115199349A (en) | 2022-08-16 | 2022-08-16 | Coal-fired power generation system with coupled steam energy storage and operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115199349A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116734230A (en) * | 2023-08-14 | 2023-09-12 | 西安热工研究院有限公司 | Fused salt steam storage system for improving safety of high-temperature gas cooled reactor generator set |
-
2022
- 2022-08-16 CN CN202210980571.0A patent/CN115199349A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116734230A (en) * | 2023-08-14 | 2023-09-12 | 西安热工研究院有限公司 | Fused salt steam storage system for improving safety of high-temperature gas cooled reactor generator set |
| CN116734230B (en) * | 2023-08-14 | 2024-01-23 | 西安热工研究院有限公司 | Fused salt steam storage system for improving safety of high-temperature gas cooled reactor generator set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113586185B (en) | Coal-fired boiler flue gas and steam combined heat storage deep peak regulation system and operation method | |
| CN115234323B (en) | Coal-fired power generation system with heat storage and pressure storage functions and operation method | |
| CN113623032B (en) | Coal-fired boiler flue gas heat storage and power generation integrated system and operation method | |
| CN109084498A (en) | A kind of adiabatic compression air-high temperature difference pump coupled heat system | |
| US11721980B2 (en) | Power generation system employing power amplifying thermo-mechanical inverter technology | |
| CN114810249B (en) | Thermoelectric decoupling system and method for heat supply unit | |
| CN114704815A (en) | Vapor heat storage system | |
| CN115199349A (en) | Coal-fired power generation system with coupled steam energy storage and operation method | |
| CN112412561A (en) | Compressed air energy storage system and thermal power plant control system coupling control method | |
| CN216554042U (en) | Heat storage coupling thermal power unit system based on molten salt heat storage | |
| CN114233421B (en) | Thermoelectric cooperative system integrated with steam injector and operation method | |
| CN113153465B (en) | Heat supply and power generation decoupling method and system for improving peak regulation capacity of heat supply unit | |
| CN218467677U (en) | Coal-fired power generation system of coupling steam heat-retaining | |
| CN114991895B (en) | Coal-fired power generation unit capable of storing energy by coupling compressed air and operation method thereof | |
| CN217481348U (en) | Heat storage and capacity increase type thermal power generating unit and power grid | |
| CN114934825A (en) | Carbon dioxide energy storage system and method coupled with coal electric machine set | |
| CN115371027A (en) | Thermal power peak regulation system | |
| CN115263461A (en) | Coal-fired power generation system coupled with multistage steam energy storage and operation method | |
| CN218598246U (en) | Integrated pressure storage and heat storage power generation system | |
| CN114837763B (en) | Flexible regulation and control system of thermal power unit integrated with steam accumulator and working method | |
| CN218717026U (en) | Power generation system integrating heat storage | |
| CN219570167U (en) | Thermal power plant unit degree of depth peak shaving system | |
| CN116335786A (en) | Power generation system integrating compressed air energy storage and heat storage | |
| CN114017148B (en) | Large-scale coal-to-electricity steam heat storage power generation peak shaving method | |
| CN220434848U (en) | Combined heat and power system based on heat storage type nuclear power and air-steam combined cycle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |