CN113107621A - 650 ℃ high-efficiency supercritical (super-supercritical) coal-fired power generation system - Google Patents
650 ℃ high-efficiency supercritical (super-supercritical) coal-fired power generation system Download PDFInfo
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- CN113107621A CN113107621A CN202110588202.2A CN202110588202A CN113107621A CN 113107621 A CN113107621 A CN 113107621A CN 202110588202 A CN202110588202 A CN 202110588202A CN 113107621 A CN113107621 A CN 113107621A
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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
- 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
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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
- F01D15/08—Adaptations for driving, or combinations with, pumps
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/18—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbine being of multiple-inlet-pressure type
-
- 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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
Abstract
The invention discloses a high-temperature-resistant alloy material with the temperature of 650 DEG CThe invention discloses a high-efficiency supercritical (super-supercritical) coal-fired power generation system, which adopts an external steam cooler to reduce heat exchange of a heat regenerator
Loss and economic efficiency are improved, and the use of two external steam coolers is expected to reduce the power generation coal consumption by 0.5-0.6 g/kWh; the low-temperature economizer is used for utilizing the waste heat of the flue gas, the economy is improved, and the input of the low-temperature economizer is more than 80% of load, so that the coal consumption of power generation is reduced by 1.5-2.0 g/kWh; according to the invention, a high-pressure heater is added, the feed water temperature is increased, and the power generation coal consumption is reduced by 0.9-1.5 g/kWh; the energy consumption of a high-parameter, high-capacity and high-efficiency power generation system is reduced, the economy is improved, and the overall energy consumption of the unit is predicted to be reduced by 15.5-18.5 g/kWh compared with that of the conventional ultra-supercritical unit; according to the invention, the main parameters of the unit are improved, the first-stage high-pressure heater is added, the two external steam coolers are additionally arranged, and the low-pressure economizer is added in the condensate system, so that the energy consumption of the unit is reduced, and the operation economy is improved.
Description
Technical Field
The invention belongs to the field of thermal power generation, and particularly relates to a 650 ℃ high-efficiency supercritical (super) critical coal-fired power generation system.
Background
Coal and electricity are large industrial departments with fossil energy consumption in China, and coal for electric power accounts for nearly half of the total fossil energy consumption of the society in China, so that the energy conservation and emission reduction of the coal and electricity play a key role in the development of the whole energy conservation and emission reduction industry in China. In recent years, the energy-saving and emission-reducing business of China has made obvious technical progress and remarkable achievement, and the annual average power supply coal consumption is reduced by 3 g/kWh. However, as the energy conservation industry steps into the deep water region, the overall energy conservation and emission reduction effects of coal and electricity are more and more difficult to obtain, and the contradiction between the development requirement for greatly reducing the social fossil energy consumption and the technical background is increasingly highlighted. The energy conservation and emission reduction are advanced, not only are coal power enterprises obey the requirements of the national macro development strategy, but also the cost reduction and efficiency improvement of the enterprises per se, the technical intensity is improved, and the vital interests of the enterprises are created.
Upgrading the coal-fired power generation technology is an effective means for remarkably improving the power generation efficiency of the unit and reducing the energy consumption. In the last twenty years, the coal-electricity units independently produced in China are gradually improved from subcritical and supercritical to 620 ℃ grade ultra-supercritical. The 650 ℃ high-parameter power generation technology is the key for relieving the conflict between deep energy-saving requirements and the prior art.
Disclosure of Invention
The invention aims to overcome the defects and provide a 650 ℃ high-efficiency supercritical coal-fired power generation system, and aims to construct the 650 ℃ high-efficiency supercritical coal-fired power generation system, reduce the power generation energy loss as much as possible and improve the operation economy.
In order to achieve the purpose, the steam-heating boiler comprises a low-pressure cylinder, an intermediate-pressure cylinder and a high-pressure cylinder, wherein the low-pressure cylinder is connected with a condenser, the intermediate-pressure cylinder is connected with a deaerator, a four-stage low-pressure heater is arranged between the condenser and the deaerator, a four-stage high-pressure heater is arranged at the downstream of the deaerator, a last-stage high-pressure heater is connected with a boiler, the boiler is connected with the high-pressure cylinder, the heat supply steam of the high-pressure cylinder is sent into the last-stage high-pressure heater through a first steam cooler, the heat supply steam of the intermediate-pressure cylinder is sent;
the main water supply temperature of the high-pressure cylinder is 310-320 ℃, the main steam pressure is 28-32 MPa, the temperature of the main steam and the reheat steam is 650 ℃, and the exhaust pressure of the low-pressure cylinder is 4.5 kPa.
And sending the regenerative steam of the low pressure cylinder into the front three-stage low pressure heater.
The heat supply steam of the intermediate pressure cylinder is sent into a final-stage low-pressure heater and a deaerator.
And the heat supply steam of the high-pressure cylinder is sent into the second-stage high-pressure heater and the third-stage high-pressure heater.
The condenser is connected with a first-stage low-pressure heater through a condensate pump.
The deaerator is connected with a primary high-pressure heater through a water feed pump.
The heat supply steam of the intermediate pressure cylinder is connected with a water supply pump steam turbine, and the water supply pump steam turbine is connected with a water supply pump.
The feed pump was a single 100% BMCR pump.
The low-pressure cylinder is connected with a generator.
The power of the generator is 600 MW-1000 MW.
Compared with the prior art, the invention adopts the external steam cooler to reduce the heat exchange of the heat regenerator
Loss and economic efficiency are improved, and the use of two external steam coolers is expected to reduce the power generation coal consumption by 0.5-0.6 g/kWh; the low-temperature economizer is used for utilizing the waste heat of the flue gas, the economy is improved, and the input of the low-temperature economizer is more than 80% of load, so that the coal consumption of power generation is reduced by 1.5-2.0 g/kWh; according to the invention, a high-pressure heater is added, the feed water temperature is increased, and the power generation coal consumption is reduced by 0.9-1.5 g/kWh; the energy consumption of a high-parameter, high-capacity and high-efficiency power generation system is reduced, the economy is improved, and the overall energy consumption of the unit is predicted to be reduced by 15.5-18.5 g/kWh compared with that of the conventional ultra-supercritical unit (25MPa/600 ℃/600 ℃); according to the invention, the main parameters of the unit are improved, the first-stage high-pressure heater is added, the two external steam coolers are additionally arranged, and the low-pressure economizer is added in the condensate system, so that the energy consumption of the unit is reduced, and the operation economy is improved.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
the system comprises a low-pressure cylinder, a medium-pressure cylinder, a high-pressure cylinder, a condenser, a deaerator, a low-pressure heater, a high-pressure heater, a boiler, a first steam cooler, a second steam cooler, a low-pressure economizer, a condensate pump, a water feeding pump, a water pump turbine, a water turbine, a generator and a steam generator, wherein the low-pressure cylinder comprises 1, the low-pressure cylinder, 2, the medium-pressure cylinder, 3, the high-pressure cylinder, 4, the condenser, 5, the deaerator, 6, the low-pressure heater.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the steam-steam heating system comprises a low-pressure cylinder 1, an intermediate-pressure cylinder 2 and a high-pressure cylinder 3, wherein the low-pressure cylinder 1 is connected with a condenser 4, the intermediate-pressure cylinder 2 is connected with a deaerator 5, a four-stage low-pressure heater 6 is arranged between the condenser 4 and the deaerator 5, a four-stage high-pressure heater 7 is arranged at the downstream of the deaerator 5, a last-stage high-pressure heater 7 is connected with a boiler 8, the boiler 8 is connected with the high-pressure cylinder 3, heat supply steam of the high-pressure cylinder 3 is sent into the last-stage high-pressure heater through a first steam cooler 9, heat supply steam of the intermediate-pressure cylinder 2 is sent into the first-stage high-pressure heater through a; the regenerative steam of the low pressure cylinder 1 is sent into the front three-stage low pressure heater 6. The heat supply steam of the intermediate pressure cylinder 2 is sent into a final-stage low-pressure heater and a deaerator 5. The heating steam of the high pressure cylinder 3 is sent into the second stage high pressure heater and the third stage high pressure heater. The condenser 4 is connected with a first-stage low-pressure heater through a condensate pump 12. The deaerator 5 is connected with a first-stage high-pressure heater through a water feeding pump 13. The supply steam of the intermediate pressure cylinder 2 is connected to a feed pump turbine 14, and the feed pump turbine 14 is connected to a feed pump 13. The low pressure cylinder 1 is connected with a generator 15.
The temperature of main feed water is 310-320 ℃, the pressure of main steam is 28-32 MPa, the temperature of main steam and the temperature of reheat steam are 650 ℃, a low-temperature economizer is arranged in a low-pressure heater, part of condensed water is mixed with a low-cost outlet #8 from a low-pressure outlet #9, the temperature after mixing is guaranteed to be more than or equal to 70 ℃, the mixed condensed water enters the low-temperature economizer, the mixed condensed water is heated by the low-temperature economizer and then is merged into the main condensed water from a low-pressure heater #7, and the temperature after heating is not more than 140 ℃; after the temperature of the main steam and the reheat steam is increased, the superheat degree of the reheat extraction steam entering the high-pressure heater is increased, and the heat exchange is reduced
Loss, an external steam cooler is arranged on the first section steam extraction pipelines of the high-pressure cylinder and the intermediate-pressure cylinder (namely the steam inlet of a #1 high-pressure heater and the steam inlet of a #4 high-pressure heater); the steam turbine of the invention designs the exhaust pressure to be 4.5kPa, the water supply pump of the invention adopts the way of steam-driven, the invention sets up a pump with 100% BMCR capacity, raise the efficiency, reduce the investment, the generator power of the invention is 600 MW-1000 MW.
The application of the invention can greatly reduce the energy consumption level of the unit, play a role in guiding the construction of a new machine, open up a new direction for the comprehensive upgrading and reconstruction of the domestic active unit, play a role in industry leading and demonstration and have important significance in realizing deep energy conservation and emission reduction of the domestic coal and electricity.
Claims (10)
1. A650 ℃ high-efficiency supercritical coal-fired power generation system is characterized by comprising a low-pressure cylinder (1), an intermediate-pressure cylinder (2) and a high-pressure cylinder (3), wherein the low-pressure cylinder (1) is connected with a condenser (4), the intermediate-pressure cylinder (2) is connected with a deaerator (5), a four-stage low-pressure heater (6) is arranged between the condenser (4) and the deaerator (5), a four-stage high-pressure heater (7) is arranged at the downstream of the deaerator (5), a boiler (8) is connected with a final-stage high-pressure heater (7), the boiler (8) is connected with the high-pressure cylinder (3), heat supply steam of the high-pressure cylinder (3) is sent into the final-stage high-pressure heater through, the heat supply steam of the intermediate pressure cylinder (2) is sent into the first-stage high-pressure heater through the second steam cooler (10), the low-pressure heater is connected with a low-pressure economizer (11), and the low-pressure economizer (11) is connected with a final-stage low-pressure heater;
the main water supply temperature of the high-pressure cylinder (2) is 310-320 ℃, the main steam pressure is 28-32 MPa, the temperature of the main steam and the reheat steam is 650 ℃, and the exhaust pressure of the low-pressure cylinder of the steam turbine is 4.5 kPa.
2. A 650 ℃ high efficiency supercritical (super) critical coal fired power generation system according to claim 1 where the regenerative steam from the low pressure cylinder (1) is fed into the first three stages of low pressure heaters (6).
3. A 650 ℃ high efficiency supercritical (super) critical coal fired power generation system according to claim 1 where the supply steam of the intermediate pressure cylinder (2) is fed into the final stage low pressure heater and deaerator (5).
4. A 650 ℃ high efficiency supercritical (super) critical coal fired power generation system according to claim 1 where the hot steam from the high pressure cylinder (3) is fed to the second stage high pressure heater and the third stage high pressure heater.
5. A 650 ℃ high efficiency supercritical (super) critical coal-fired power generation system as claimed in claim 1 wherein the condenser (4) is connected to the primary low pressure heater through condensate pump (12).
6. A 650 ℃ high efficiency supercritical (super) critical coal-fired power generation system as claimed in claim 1 wherein the deaerator (5) is connected to the primary high pressure heater through feed water pump (13).
7. A650 ℃ high efficiency supercritical (ultra) critical coal-fired power generation system according to claim 6 characterized in that the supply steam of the intermediate pressure cylinder (2) is connected to the feed pump turbine (14), and the feed pump turbine (14) is connected to the feed pump (13).
8. A650 ℃ high efficiency supercritical (super) critical coal-fired power generation system according to claim 6 where the feedwater pump (13) is a single 100% BMCR capacity pump.
9. A 650 ℃ high efficiency supercritical (super) critical coal fired power generation system according to claim 1 where the low pressure cylinder (1) is connected to a generator (15).
10. A 650 ℃ high efficiency ultra (supercritical) coal-fired power generation system according to claim 9, characterized in that the generator power of the generator (15) is 600MW to 1000 MW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110588202.2A CN113107621A (en) | 2021-05-28 | 2021-05-28 | 650 ℃ high-efficiency supercritical (super-supercritical) coal-fired power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110588202.2A CN113107621A (en) | 2021-05-28 | 2021-05-28 | 650 ℃ high-efficiency supercritical (super-supercritical) coal-fired power generation system |
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| Publication Number | Publication Date |
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| CN113107621A true CN113107621A (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110588202.2A Pending CN113107621A (en) | 2021-05-28 | 2021-05-28 | 650 ℃ high-efficiency supercritical (super-supercritical) coal-fired power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819659A (en) * | 2021-10-29 | 2021-12-21 | 西安热工研究院有限公司 | Thermal power generating unit peak regulation system and method for solar-assisted heating of condensed water |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031999A (en) * | 2010-11-23 | 2011-04-27 | 江苏丰泰冷却塔有限公司 | Thermal power generator set with high-efficient circulating system |
| CN107062192A (en) * | 2017-04-20 | 2017-08-18 | 中国能源建设集团广东省电力设计研究院有限公司 | Heat regenerative system and deaerator bay |
| CN111894690A (en) * | 2020-09-03 | 2020-11-06 | 西安热工研究院有限公司 | Steam turbine heat regeneration system and method for improving parameters of thermal power generating unit to 650 DEG C |
-
2021
- 2021-05-28 CN CN202110588202.2A patent/CN113107621A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031999A (en) * | 2010-11-23 | 2011-04-27 | 江苏丰泰冷却塔有限公司 | Thermal power generator set with high-efficient circulating system |
| CN107062192A (en) * | 2017-04-20 | 2017-08-18 | 中国能源建设集团广东省电力设计研究院有限公司 | Heat regenerative system and deaerator bay |
| CN111894690A (en) * | 2020-09-03 | 2020-11-06 | 西安热工研究院有限公司 | Steam turbine heat regeneration system and method for improving parameters of thermal power generating unit to 650 DEG C |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819659A (en) * | 2021-10-29 | 2021-12-21 | 西安热工研究院有限公司 | Thermal power generating unit peak regulation system and method for solar-assisted heating of condensed water |
| CN113819659B (en) * | 2021-10-29 | 2022-11-25 | 西安热工研究院有限公司 | Thermal power generating unit peak regulation system and method for solar-assisted heating of condensed water |
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