CN113756893A - Multi-unit combined operation flexibility adjusting system among multiple power plants - Google Patents
Multi-unit combined operation flexibility adjusting system among multiple power plants Download PDFInfo
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- CN113756893A CN113756893A CN202110992647.7A CN202110992647A CN113756893A CN 113756893 A CN113756893 A CN 113756893A CN 202110992647 A CN202110992647 A CN 202110992647A CN 113756893 A CN113756893 A CN 113756893A
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- 238000005338 heat storage Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005485 electric heating Methods 0.000 claims abstract description 11
- 238000010248 power generation Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000010977 unit operation Methods 0.000 claims abstract description 4
- 230000001172 regenerating effect Effects 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
- F01K3/186—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters using electric heat
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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
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/08—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being steam
Abstract
The invention discloses a multi-unit combined operation flexibility adjusting system for multiple power plants, which comprises an in-service coal-fired unit, a shutdown unit steam turbine generator unit and a heat storage system. When the unit operation meets the power grid load requirement, the in-service coal-fired unit normally works, and the steam turbine generator unit of the shutdown unit stops running; in the load reduction operation process, an electric heating switch of the heat storage system is closed, redundant generated energy is heated to a heat storage medium, and the unit network electric quantity is reduced; in the load increasing process, the heat storage system releases heat to the water supply in the steam turbine generator unit of the shutdown unit, and generates steam to push the steam turbine of the steam turbine generator unit of the shutdown unit to do work, so that the power generation power of the network is increased. The heat storage technology is utilized to regulate the peak of the coal-fired power plant and simultaneously shut down the power plant to generate electricity again, so that the method has higher economic benefit.
Description
Technical Field
The invention relates to a flexible operation system of a coal-fired unit, in particular to a multi-power-plant multi-unit combined operation flexibility adjusting system capable of realizing flexible operation among multiple power plants.
Background
A large number of small and medium-sized power plants are shut down, but equipment still exists, only a boiler system does not fire coal any more, and the boiler system cannot work continuously; the invention fully exploits the value of shutting down the power plant, stores the surplus electric quantity in the heat storage system when the load of the large coal-fired power plant is reduced and the peak load is regulated, and releases heat in the peak period of power utilization to heat the feed water of the shutting down power plant to generate steam, thereby realizing the purpose of pushing the steam turbine to do work and increasing the power generation. The invention can generate electricity again by shutting down the power plant while playing the role of peak regulation of the coal-fired power plant, and has good economic benefit.
Disclosure of Invention
The invention aims to provide a scheme for improving a multi-station multi-unit combined operation flexibility adjusting system. The surplus electric quantity is stored in the form of heat energy when the peak regulation is carried out in the large coal-fired power plant, the part of heat is used for heating the feedwater of the small power plant which is stopped to generate steam when the power supply peak is carried out, and the steam turbine is pushed to do work, so that the effect of increasing the power generation is achieved, the shutdown power plant can be used for generating power again when the peak regulation is carried out on the coal-fired power plant, and the high economical efficiency is achieved.
The technical solution of the invention is as follows:
a multi-station multi-unit combined operation flexibility adjusting system is characterized in that: the system comprises an in-service coal-fired unit 1, a shutdown unit turbo generator unit 2 and a heat storage system 3.
The in-service coal-fired unit 1 comprises: a boiler system 11, a first turbine system 12, a first generator system 13, a first condenser 14, a first feed water pump 15, and a regenerative heater system 16; the first boiler system 11 is connected with the first turbine system 12, the first condenser 14, the first feed pump 15 and the regenerative heater system 16 in sequence; the first turbine system 12 is connected to the first generator system 13; the first turbine system 12 is further connected with the first regenerative heater system 16 and the first condenser 14 in sequence; the first generator system 12 is also connected with the electric heating switch 37;
the shutdown unit turbo generator set 2 includes: a second turbine system 22, a second generator system 23, a second condenser 24, and a second feedwater pump 25; the second turbine system 22 is connected to the second condenser 24, the second feed water pump 25, the preheater 31, the evaporator 32, and the superheater 33 in sequence; the second turbine system 22 is connected to the second generator system 23;
the heat storage system 3 includes: a preheater 31, an evaporator 32, a superheater 33, a low-temperature storage tank 34, an electric heater 35, and a high-temperature storage tank 36; the high-temperature storage tank 36 is sequentially connected with the superheater 33, the evaporator 32, the preheater 31 and the low-temperature storage tank 34, and the low-temperature storage tank 34 is sequentially connected with the electric heater 35 and the high-temperature storage tank (36); the electric heater 35 is also connected to an electric heating switch 37.
The in-service coal-fired unit 1 can be selected from a 600 MW-level coal-fired unit, a 660 MW-level coal-fired unit and a 1000 MW-level coal-fired unit; the steam turbine generator unit 2 of the shutdown unit can be selected from a 25 MW-level coal-fired unit, a 35 MW-level coal-fired unit and a 100 MW-level coal-fired unit.
The heat storage medium selected in the high-temperature storage tank 36 is molten salt, and the working temperature range of the heat storage medium is 80-800 ℃.
The steam pressure at the inlet of the second turbine system 22 is between 5 and 15MPa, and the steam temperature is higher than 500 ℃.
A multi-power-plant multi-unit combined operation flexibility adjusting system is provided, and the using method comprises the following steps:
when the unit operation meets the load requirement of a power grid, the operation system of the coal-fired unit 1 in service works;
when the load of the unit is higher than the load of a power grid and the load reduction and peak shaving are needed, the coal-fired unit in service operates 1, and the generated surplus electric quantity is stored in the heat storage system 3 in an electric heating mode;
when the load of the unit is lower than the load demand of a power grid, the coal-fired unit 1 in service and the steam turbine generator unit 2 of the shutdown unit work simultaneously, the power generation power of the unit entering the grid is increased, and the heat source of the steam turbine generator unit 2 of the shutdown unit comes from the heat storage system 3.
The invention has the beneficial effects that:
under the condition that a small coal-fired power plant is shut down in a large quantity, the heat storage technology is adopted to store the surplus electric quantity when the load of the large power plant is reduced and the peak is regulated, the heat is used for heating the feed water of the shut-down power plant to generate steam in the peak period of power utilization, and a steam turbine is pushed to do work, so that the effect of increasing the power generation is achieved. The system has the following advantages: when the normal operation of a large coal-fired power plant is ensured, the shutdown power plant is reused, the network-entering electric quantity is increased on the premise of not starting a boiler system of the shutdown power plant, the peak regulation requirement of the coal-fired power plant is realized, the shutdown power plant is fully utilized, and the high economic value is realized.
Drawings
FIG. 1 is a schematic flow chart of a multi-plant multi-unit joint operation flexibility adjustment system according to the present invention;
FIG. 2 is a schematic view of the operation of the load-reducing heat storage system of the present invention;
fig. 3 is a schematic diagram of the network access power flow of the load-increasing unit of the invention.
Description of main original symbols:
the system comprises an in-service coal-fired unit 1, a shutdown unit turbo generator unit 2, a heat storage system 3, a boiler system 11, a first turbine system 12, a first generator system 13, a first condenser 14, a first water feed pump 15 and a regenerative heater system 16; the system comprises a second steam turbine system 22, a second generator system 23, a second condenser 24, a second feed water pump 25, a preheater 31, an evaporator 32, a superheater 33, a low-temperature storage tank 34, an electric heater 35, a high-temperature storage tank 36 and an electric heating switch 37.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a multi-plant multi-unit joint operation flexibility adjustment system.
A multi-station multi-unit combined operation flexibility adjusting system is characterized in that: the system comprises an in-service coal-fired unit 1, a shutdown unit turbo generator unit 2 and a heat storage system 3.
The in-service coal-fired unit 1 comprises: a boiler system 11, a first turbine system 12, a first generator system 13, a first condenser 14, a first feed water pump 15, and a regenerative heater system 16; the first boiler system 11 is connected with the first turbine system 12, the first condenser 14, the first feed pump 15 and the regenerative heater system 16 in sequence; the first turbine system 12 is connected to the first generator system 13; the first turbine system 12 is further connected with the first regenerative heater system 16 and the first condenser 14 in sequence; the first generator system 12 is also connected with the electric heating switch 37;
the shutdown unit turbo generator set 2 includes: a second turbine system 22, a second generator system 23, a second condenser 24, and a second feedwater pump 25; the second turbine system 22 is connected to the second condenser 24, the second feed water pump 25, the preheater 31, the evaporator 32, and the superheater 33 in sequence; the second turbine system 22 is connected to the second generator system 23;
the heat storage system 3 includes: a preheater 31, an evaporator 32, a superheater 33, a low-temperature storage tank 34, an electric heater 35, and a high-temperature storage tank 36; the high-temperature storage tank 36 is sequentially connected with the superheater 33, the evaporator 32, the preheater 31 and the low-temperature storage tank 34, and the low-temperature storage tank 34 is sequentially connected with the electric heater 35 and the high-temperature storage tank 36; the electric heater 35 is also connected to an electric heating switch 37.
The in-service coal-fired unit 1 is a 600 MW-level coal-fired unit, and the shutdown unit steam turbine generator unit 2 is a 25 MW-level coal-fired unit.
The heat storage medium selected in the high-temperature storage tank 36 is molten salt, and the working temperature range of the heat storage medium is 80-800 ℃.
The steam pressure at the inlet of the second turbine system 22 is between 5 and 15MPa, and the steam temperature is higher than 500 ℃.
When the unit operation meets the load requirement of the power grid, the electric quantity generated by the first generator system 13 of the coal-fired unit 1 in service is directly merged into the power grid.
FIG. 2 is a schematic view of the operation of the load-reducing heat storage system of the present invention;
when the load of the unit is higher than the load of the power grid and the load reduction and peak shaving are needed, the redundant electric quantity generated by the first generator system 13 of the coal-fired unit 1 in service heats the low-temperature molten salt from the low-temperature tank 34 into high temperature through the electric heater 35 in an electric heating mode, and the high-temperature molten salt is stored in the high-temperature molten salt tank 36.
FIG. 3 is a schematic diagram of the output flow of the load-increasing unit according to the present invention.
When the load of the unit is lower than the load demand of the power grid, the coal-fired unit 1 in service and the steam turbine power generation system 2 of the shutdown unit work to increase the power generation power of the unit entering the power grid. Molten salt in a high-temperature storage tank 36 from the heat storage system 3 is pumped out and flows through a superheater 33, an evaporator 32 and a preheater 31 in sequence, water is heated into superheated steam, the superheated steam flows through a second steam turbine system 22, and a second generator system 23 is driven to generate electricity; at the moment, the in-service unit normally generates power.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All the simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application belong to the protection scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (6)
1. A multi-station multi-unit combined operation flexibility adjusting system is characterized in that: the system comprises an in-service coal-fired unit (1), a shutdown unit steam turbine generator unit (2) and a heat storage system (3).
The in-service coal-fired unit (1) comprises: the system comprises a boiler system (11), a first turbine system (12), a first generator system (13), a first condenser (14), a first water feed pump (15) and a regenerative heater system (16); the first boiler system (11) is sequentially connected with the first turbine system (12), the first condenser (14), the first water feeding pump (15) and the regenerative heater system (16); the first turbine system (12) is connected to the first generator system (13) shaft; the first turbine system (12) is also connected with the first regenerative heater system (16) and the first condenser (14) in sequence; the first generator system (12) is also connected with the electric heating switch 37;
the shutdown unit steam turbine generator unit (2) comprises: a second turbine system (22), a second generator system (23), a second condenser (24) and a second feedwater pump (25); the second turbine system (22) is connected with the second condenser (24), the second feed water pump (25), the preheater (31), the evaporator (32) and the superheater (33) in sequence; the second turbine system (22) is connected with the second generator system (23) shaft;
the heat storage system (3) comprises: the system comprises a preheater (31), an evaporator (32), a superheater (33), a low-temperature storage tank (34), an electric heater (35) and a high-temperature storage tank (36); the high-temperature storage tank (36) is sequentially connected with the superheater (33), the evaporator (32), the preheater (31) and the low-temperature storage tank (34), and the low-temperature storage tank (34) is sequentially connected with the electric heater (35) and the high-temperature storage tank (36); the electric heater (35) is also connected with an electric heating switch (37).
2. The system for adjusting flexibility of multi-plant multi-unit combined operation according to claim 1, wherein: the in-service coal-fired unit (1) is a 600 MW-level coal-fired unit, a 660 MW-level coal-fired unit or a 1000 MW-level coal-fired unit.
3. The system for adjusting flexibility of multi-plant multi-unit combined operation according to claim 1, wherein: the shutdown unit steam turbine generator unit (2) is a 25 MW-level coal-fired unit, a 35 MW-level coal-fired unit or a 100 MW-level coal-fired unit.
4. The system for adjusting flexibility of multi-plant multi-unit combined operation according to claim 1, wherein: the heat storage medium selected in the high-temperature storage tank (36) is molten salt, and the working temperature range of the heat storage medium is 80-800 ℃.
5. The system for adjusting flexibility of multi-plant multi-unit combined operation according to claim 1, wherein: the steam pressure at the inlet of the second turbine system (22) is between 5 and 15MPa, and the steam temperature is higher than 500 ℃.
6. A multi-plant multi-unit combined operation flexibility regulation system according to claims 1-5, wherein the use method comprises the following steps:
when the unit operation meets the requirement of the power grid load, the operation system of the coal-fired unit (1) in service works;
when the load of the unit is higher than the load of a power grid and the load reduction and peak shaving are needed, the coal-fired unit in service operates 1, and the generated surplus electric quantity is stored in the heat storage system (3) in an electric heating mode;
when the load of the unit is lower than the load demand of a power grid, the coal-fired unit (1) in service and the steam turbine generator unit (2) of the shutdown unit work simultaneously, the power generation power of the unit entering the grid is increased, and the heat source of the steam turbine generator unit (2) of the shutdown unit comes from the heat storage system (3).
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| CN202110992647.7A CN113756893A (en) | 2021-08-27 | 2021-08-27 | Multi-unit combined operation flexibility adjusting system among multiple power plants |
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| CN202110992647.7A CN113756893A (en) | 2021-08-27 | 2021-08-27 | Multi-unit combined operation flexibility adjusting system among multiple power plants |
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| CN115854412A (en) * | 2023-02-03 | 2023-03-28 | 华能济南黄台发电有限公司 | Electric boiler system of heat supply unit of urban power plant |
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