CN114935137A - Solar-assisted coal-fired flexible power generation system and working method - Google Patents
Solar-assisted coal-fired flexible power generation system and working method Download PDFInfo
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- CN114935137A CN114935137A CN202210590710.9A CN202210590710A CN114935137A CN 114935137 A CN114935137 A CN 114935137A CN 202210590710 A CN202210590710 A CN 202210590710A CN 114935137 A CN114935137 A CN 114935137A
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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
- F22B1/006—Methods of steam generation characterised by form of heating method using solar heat
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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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
- F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
- F24S10/753—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations the conduits being parallel to each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Abstract
The invention discloses a solar-assisted coal-fired flexible power generation system and a working method thereof.
Description
Technical Field
The invention relates to the technical field of multi-energy complementary power generation, in particular to a solar-assisted coal-fired flexible power generation system and a working method.
Background
In recent years, the scale of renewable energy utilization is rapidly increasing, and the proportion of solar power generation to renewable energy power generation is increasing. However, due to the intermittency of solar energy, the fluctuation of a power grid is aggravated due to large-scale grid-connected power generation, and the consumption of renewable energy sources in partial regions is difficult; in order to meet the frequent peak-load and frequency-modulation requirements of the power grid, the flexibility and the economy of a solar thermal power generation system and a coal-fired power generation system need to be improved, the solar thermal power generation system and the coal-fired power generation system are required to be capable of responding to the peak-load and frequency-modulation requirements of the power grid while outputting electric power stably, and the solar thermal power generation system and the coal-fired power generation system are required to operate flexibly and economically and quickly in a load-variable manner. However, the coupling mode of the existing solar thermal power generation system and the coal-fired power generation system is not enough to cope with the power fluctuation caused by the frequent change of the solar radiation intensity, and no reasonable solution is provided to ensure that the flexibility of the solar thermal power generation and the coal-fired power generation unit meets the requirement of a power grid and the economical efficiency is improved, and the problems to be solved include:
1) when the power grid requires fast peak shaving and frequency modulation, the limit of stable combustion load of a boiler and large thermal inertia of a coal-fired generator set needs to be overcome, the requirements of fast load variation and deep load variation are difficult to meet, and a coupling scheme with higher potential needs to be found.
2) The method needs to cope with the change of external conditions such as solar radiation intensity and the like, maintains stable power generation power of the complementary system, and simultaneously searches a reasonable operation scheme to enable the complementary system to operate quickly and flexibly in a variable load mode, so that the requirement of a power grid on the flexibility of a generator set is met.
Disclosure of Invention
The invention aims to overcome the defects and provides a solar-assisted coal-fired flexible power generation system and a working method thereof, which can realize the power generation coupling of solar energy and coal firing, increase the steam generated by a solar heat collection evaporation device to do work, reduce the coal consumption, utilize a steam storage device to respond to the change of solar radiation intensity, and simultaneously adjust the flow of reheated steam to meet the performance requirement of quick deep variable load of the system.
In order to achieve the purpose, the solar-assisted coal-fired flexible power generation system comprises a solar heat collection evaporation device, wherein a steam outlet of the solar heat collection evaporation device is connected with a steam storage tank, a steam outlet of the steam storage tank is connected with a boiler and a medium pressure cylinder through pipelines, an overheated steam outlet of the boiler is connected with a high pressure cylinder through a pipeline, a reheated steam outlet of the boiler is connected with the steam storage tank through a pipeline, and a water outlet of the steam storage tank is connected with the solar heat collection evaporation device through a pipeline.
The solar heat collection evaporation device comprises a plurality of stages of heat collection evaporation tubes, each stage of heat collection evaporation tube is connected with a steam storage tank, and corresponding inlet adjusting valves are arranged on the upper streams of the second stage of heat collection evaporation tubes and the later stage of heat collection evaporation tubes.
And a steam outlet tank regulating valve is arranged on a connecting pipeline of the steam storage tank and the boiler and the medium pressure cylinder.
And a reheat steam inlet tank regulating valve is arranged on a connecting pipeline of the boiler and the steam storage tank.
A communicating vessel is arranged on a connecting pipeline between the water outlet of the steam storage tank and the solar heat collection and evaporation device.
The steam outlet of the medium-low pressure cylinder is connected with a condenser, the condenser is connected with a condensate pump, the condensate pump is connected with a low-pressure heater, the low-pressure heater is connected with a deaerator, the deaerator is connected with a water feeding pump, the water feeding pump is connected with a high-pressure heater, the high-pressure heater is connected with a water feeding inlet of a boiler, a first-stage steam extraction outlet of the high-pressure cylinder is communicated with a steam inlet of the high-pressure heater through a pipeline, a first-stage steam extraction outlet of the medium-low pressure cylinder is communicated with a steam inlet of the deaerator through a pipeline, and a second-stage steam extraction outlet is communicated with a steam inlet of the low-pressure heater through a pipeline.
The deaerator is connected with the solar heat collection evaporation device, and a water supply regulating valve is arranged on a connecting pipeline of the deaerator and the solar heat collection evaporation device.
A working method of a solar-assisted coal-fired flexible power generation system comprises the following steps:
when solar radiation intensity exists, steam generated by feeding water into the solar heat collection evaporation device enters the steam storage tank, the pressure in the steam storage tank is kept, and the steam in the steam storage tank flows out to be mixed with reheated steam of a boiler and enters the low-pressure cylinder of the steam turbine to do work;
when the generator set needs to be subjected to load increase, the steam quantity sent out by the steam storage tank is increased, and the flow of the reheat steam entering the low-pressure cylinder is adjusted, so that the speed of the increase of the flow of the reheat steam entering the low-pressure cylinder to do work meets the speed requirement of load increase;
when the generator set needs deep load reduction, the steam quantity sent out by the steam storage tank is reduced, the reheat steam flows back into the steam storage tank, the redundant reheat steam enters the steam storage tank, and the speed of reducing the flow of the reheat steam entering the middle-low pressure cylinder to do work meets the speed requirement of load reduction.
When the solar radiation intensity changes, the pressure safety of the steam storage tank is maintained and the stable operation parameters of the coal-fired generator set are ensured by adjusting the water supply adjusting valve, the inlet adjusting valves of all stages of heat collection evaporating pipes and the steam outlet adjusting valve.
Compared with the prior art, the solar energy heat collection and evaporation device is provided, the steam outlet of the solar energy heat collection and evaporation device is connected with the steam storage tank, and the steam outlet of the steam storage tank is connected with the boiler and the medium pressure cylinder through the pipeline.
Furthermore, the corresponding inlet regulating valves are arranged at the upstream of the second-stage heat collection evaporation pipe and each subsequent heat collection evaporation pipe, the solar energy and coal-fired power generation coupling system can control the water supply flow and the flow of reheated steam entering the solar energy heat collection evaporation device, realize the coupling of solar energy and coal-fired power generation, realize the rapid load change under the condition of stable combustion of a boiler, obviously improve the flexibility of a unit and meet the requirement of frequent peak regulation and frequency modulation of a power grid.
Drawings
FIG. 1 is a system diagram of the present invention;
the system comprises a boiler 1, a boiler 2, a high-pressure cylinder 3, a medium-low pressure cylinder 4, a condenser 5, a condensate pump 6, a low-pressure heater 7, a deaerator 8, a water feed pump 9, a high-pressure heater 10, a water feed regulating valve 11, a solar heat collection evaporation device 12, a steam storage tank 13, a communicating vessel 14, a reheated steam inlet tank regulating valve 15, a steam outlet tank regulating valve 111, a primary heat collection evaporation pipe 112, a secondary heat collection evaporation pipe 113, a tertiary heat collection evaporation pipe 114, a secondary heat collection evaporation pipe inlet regulating valve 115 and a tertiary heat collection evaporation pipe inlet regulating valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a solar-assisted coal-fired flexible power generation system comprises a solar heat collection evaporation device 11, a steam outlet of the solar heat collection evaporation device 11 is connected with a steam storage tank 12, a steam outlet of the steam storage tank 12 is connected with a boiler 1 and a medium pressure cylinder 3 through pipelines, an overheated steam outlet of the boiler 1 is connected with a high pressure cylinder 2 through a pipeline, a reheated steam outlet of the boiler 1 is connected with the steam storage tank 12 through a pipeline, and a water outlet of the steam storage tank 12 is connected with the solar heat collection evaporation device 11 through a pipeline. Steam outlet connection condenser 4 of well low pressure jar 3, condensate pump 5 is connected to condenser 4, low pressure heater 6 is connected to condensate pump 5, low pressure heater 6 connects oxygen-eliminating device 7, water-feeding pump 8 is connected to oxygen-eliminating device 7, water-feeding pump 8 connects high pressure feed water heater 9, boiler 1's feedwater entry is connected to high pressure feed water heater 9, the first order of high pressure jar 2 is taken out the steam outlet and is linked together through the pipeline with high pressure feed water heater 9's steam inlet, the first order of well low pressure jar 3 is taken out the steam outlet and is linked together through the pipeline with the steam inlet of oxygen-eliminating device 7, the second order is taken out the steam outlet and is linked together through the pipeline with low pressure feed water heater 6's steam inlet. The deaerator 7 is connected with the solar heat collection evaporation device 11, and a water supply regulating valve 10 is arranged on a connecting pipeline of the deaerator 7 and the solar heat collection evaporation device 11.
The solar heat collection evaporation device 11 comprises a plurality of stages of heat collection evaporation tubes, each stage of heat collection evaporation tube is connected with the steam storage tank 12, and corresponding inlet adjusting valves are arranged on the upper streams of the second stage of heat collection evaporation tubes and the later stage of heat collection evaporation tubes. A steam outlet regulating valve 15 is arranged on a connecting pipeline of the steam storage tank 12 and the boiler 1 as well as the intermediate pressure cylinder 3. A reheat steam inlet tank regulating valve 14 is arranged on a connecting pipeline between the boiler 1 and the steam storage tank 12. A communicating vessel 13 is arranged on a connecting pipeline between the water outlet of the steam storage tank 12 and the solar heat collection and evaporation device 11.
Preferably, the arrangement of the solar heat collecting evaporation device 11 is as follows: the steam outlet of the third-stage heat-collecting evaporation tube 113 is the steam outlet of the solar heat-collecting evaporation device 11; the water inlet of the primary heat collecting evaporation tube 111 is the inlet of the solar heat collecting evaporation device 11; the steam outlet of the first-stage heat-collecting evaporation tube 111 is communicated with the steam outlet of the second-stage heat-collecting evaporation tube 112 and the steam outlet of the third-stage heat-collecting evaporation tube 113 through pipelines; the water supply inlet of the second-stage heat collection evaporating pipe 112 is communicated with the water supply inlet of the first-stage heat collection evaporating pipe 111 through a second-stage heat collection evaporating pipe inlet regulating valve 114; the steam outlet of the second-stage heat collection evaporating pipe 112 is communicated with the steam outlet of the third-stage heat collection evaporating pipe 113 through a pipeline; the water supply inlet of the third stage heat collecting evaporation tube 113 is communicated with the water supply inlet of the first stage heat collecting evaporation tube 111 through a third stage heat collecting evaporation tube inlet regulating valve 115.
Preferably, the first-stage heat-collecting evaporation tube 111, the second-stage heat-collecting evaporation tube 112 and the third-stage heat-collecting evaporation tube 113 are glass-metal sealed vacuum tubes.
A working method of a solar-assisted coal-fired flexible power generation system comprises the following steps:
when solar radiation intensity exists, opening a secondary heat collection evaporation pipe inlet regulating valve 114 and a tertiary heat collection evaporation pipe inlet regulating valve 115 in sequence according to the intensity of the solar radiation, regulating the valve opening of a water supply regulating valve 10, enabling steam generated by feed water entering a solar heat collection evaporation device 11 to enter a steam storage tank 12, regulating the target to keep the pressure in the steam storage tank 12 in a safe range, regulating a steam outlet regulating valve 15, enabling the steam in the steam storage tank 12 to flow out to be mixed with the reheated steam of a boiler, and entering a low-pressure cylinder 3 of the steam turbine to do work, wherein the regulated target is that the temperature and the pressure of the reheated steam after mixing are set values of a coal-fired power generation system, and the power generation power is rated power generation power; when the generator set needs to rapidly increase the load, the opening of the steam outlet tank regulating valve 15 is increased, the reheat steam inlet tank regulating valve 14 is closed, the flow of the reheat steam entering the low-pressure steam cylinder 3 of the steam turbine is regulated, the regulation target is that the increased speed of the flow of the reheat steam entering the low-pressure steam cylinder 3 of the steam turbine for doing work meets the speed requirement of increasing the load, so that the load increasing rate of the generator set meets the requirement of rapidly increasing the load of a power grid; when the generator set needs to rapidly and deeply reduce the load, the steam outlet adjusting valve 15 is closed, the reheat steam inlet adjusting valve 14 is opened, the opening of the reheat steam inlet adjusting valve 14 is adjusted, the adjustment target is to enable redundant reheat steam to enter the steam storage tank 12 under the condition that stable combustion of the boiler is maintained, the speed of reducing the flow of the reheat steam entering the low-pressure cylinder 3 of the steam turbine to do work meets the speed requirement of reducing the load, and the load reducing speed of the generator set meets the requirement of rapidly reducing the load of a power grid.
According to the invention, a solar flexible utilization system is coupled with a coal-fired power generation system, when the solar radiation intensity changes, the pressure safety of a steam storage tank 12 is maintained and the operation parameters of a coal-fired power generator set are stable by adjusting a water supply adjusting valve 10, a secondary heat collection evaporation pipe inlet adjusting valve 114, a tertiary heat collection evaporation pipe inlet adjusting valve 115 and a steam outlet tank adjusting valve 15, so that the rated power is stably output, and the coal consumption rate is saved by utilizing solar energy; when the power grid requires the unit to change the load quickly, the flow of the reheat steam is controlled by adjusting the opening degrees of the steam outlet tank adjusting valve 15 and the reheat steam inlet tank adjusting valve 14, so that the flexible and quick load change of the system can be realized; after the requirement of the generating load of the unit is met, the flow of the redundant reheat steam is stored in the steam storage tank 12, and the wide-range load-variable operation capacity of the system is improved. The invention can solve the problems of insufficient flexibility and economy when the solar energy and coal-fired unit participate in peak shaving.
The invention maintains the pressure in the steam storage tank in a safe range by adjusting the water supply adjusting valve and the steam outlet adjusting valve, and simultaneously maintains the stable power generation power and saves the coal consumption; secondly, the steam storage tank is used for peak regulation and frequency modulation, and the opening of a steam outlet tank regulating valve is regulated to increase the flow of reheat steam, so that the load of the system is quickly increased; the reheating steam is stored by adjusting a reheating steam inlet tank adjusting valve, so that the load of the unit is quickly and deeply reduced under the condition of maintaining stable combustion of the boiler; the invention can realize the coupling power generation of the solar energy and the coal-fired unit, reduce the coal consumption of the system and obviously improve the flexibility and the economy of the unit.
Claims (9)
1. The utility model provides a fire coal nimble power generation system is assisted to solar energy, a serial communication port, including solar energy collection evaporation plant (11), the steam exit linkage steam storage tank (12) of solar energy collection evaporation plant (11), the vapour outlet of steam storage tank (12) passes through tube coupling boiler (1) and intermediate pressure jar (3), superheated steam outlet of boiler (1) passes through tube coupling high pressure jar (2), reheat steam outlet of boiler (1) passes through tube coupling steam storage tank (12), the water outlet of steam storage tank (12) passes through tube coupling solar energy collection evaporation plant (11).
2. The solar energy-assisted coal-fired flexible power generation system according to claim 1, wherein the solar heat collection evaporation device (11) comprises a plurality of stages of heat collection evaporation tubes, each stage of heat collection evaporation tube is connected with the steam storage tank (12), and corresponding inlet adjusting valves are arranged from the second stage of heat collection evaporation tube and the upstream of each stage of heat collection evaporation tube.
3. The solar-assisted coal-fired flexible power generation system according to claim 1, characterized in that a steam outlet regulating valve (15) is arranged on a connecting pipeline of the steam storage tank (12) and the boiler (1) and the medium pressure cylinder (3).
4. The solar-assisted coal-fired flexible power generation system according to claim 1, characterized in that a reheat steam inlet tank regulating valve (14) is arranged on a connecting pipeline between the boiler (1) and the steam storage tank (12).
5. The solar-assisted coal-fired flexible power generation system according to claim 1, characterized in that a communicating vessel (13) is arranged on a connecting pipeline between a water outlet of the steam storage tank (12) and the solar heat collection and evaporation device (11).
6. The solar-assisted coal-fired flexible power generation system according to claim 1, characterized in that a steam outlet of the medium and low pressure cylinder (3) is connected with a condenser (4), the condenser (4) is connected with a condensate pump (5), the condensate pump (5) is connected with a low pressure heater (6), the low pressure heater (6) is connected with a deaerator (7), the deaerator (7) is connected with a water feed pump (8), the water feed pump (8) is connected with a high pressure heater (9), the high pressure heater (9) is connected with a water feed inlet of the boiler (1), a first-stage steam extraction outlet of the high pressure cylinder (2) is communicated with a steam inlet of the high pressure heater (9) through a pipeline, a first-stage steam extraction outlet of the medium and low pressure cylinder (3) is communicated with a steam inlet of the deaerator (7) through a pipeline, and a second-stage steam extraction outlet is communicated with a steam inlet of the low pressure cylinder (6) through a pipeline.
7. The solar-assisted coal-fired flexible power generation system according to claim 6, characterized in that the deaerator (7) is connected with the solar heat-collecting evaporation device (11), and a water supply regulating valve (10) is arranged on a connecting pipeline of the deaerator (7) and the solar heat-collecting evaporation device (11).
8. A method of operating a solar-assisted coal-fired flexible power generation system of claim 1, comprising the steps of:
when solar radiation intensity exists, steam generated when feed water enters the solar heat collection evaporation device (11) enters the steam storage tank (12), the pressure in the steam storage tank (12) is kept, the steam in the steam storage tank (12) flows out to be mixed with reheated steam in the boiler (1), and the steam enters the steam turbine low-pressure cylinder (3) to do work;
when the generator set needs to be loaded, the steam quantity sent out by the steam storage tank (12) is increased, and the flow of the reheat steam entering the low-pressure cylinder (3) is adjusted, so that the speed of the flow increase of the reheat steam entering the low-pressure cylinder (3) to do work meets the load-lifting speed requirement;
when the generator set needs deep load reduction, the steam quantity sent out by the steam storage tank (12) is reduced, the reheated steam flows back to the steam storage tank (12), redundant reheated steam enters the steam storage tank (12), and the speed of reducing the flow of the reheated steam entering the middle-low pressure cylinder (3) to do work meets the speed requirement of load reduction.
9. The operating method of a solar-assisted coal-fired flexible power generation system according to claim 8, characterized in that when the solar radiation intensity changes, the pressure safety of the steam storage tank (12) is maintained and the operation parameters of the coal-fired power generation unit are stable by adjusting the feed water adjusting valve (10), the inlet adjusting valves of the heat collecting evaporation pipes at all stages and the steam outlet adjusting valve (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210590710.9A CN114935137A (en) | 2022-05-27 | 2022-05-27 | Solar-assisted coal-fired flexible power generation system and working method |
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| CN202210590710.9A CN114935137A (en) | 2022-05-27 | 2022-05-27 | Solar-assisted coal-fired flexible power generation system and working method |
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- 2022-05-27 CN CN202210590710.9A patent/CN114935137A/en active Pending
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