CN113236380B - Low-pressure cylinder zero-output coupling heat storage tank's cold unit heating system that prevents frostbite - Google Patents
Low-pressure cylinder zero-output coupling heat storage tank's cold unit heating system that prevents frostbite Download PDFInfo
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- CN113236380B CN113236380B CN202110688276.3A CN202110688276A CN113236380B CN 113236380 B CN113236380 B CN 113236380B CN 202110688276 A CN202110688276 A CN 202110688276A CN 113236380 B CN113236380 B CN 113236380B
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses an anti-freezing heat supply system of a indirect cooling unit of a low-pressure cylinder zero-output coupling heat storage tank, which comprises a heat storage tank, an indirect cooling anti-freezing water inlet valve, a circulating water pump and an indirect air cooling tower, wherein the indirect cooling tower is arranged in the heat storage tank; the system can effectively solve the anti-freezing problem of the indirect cooling tower when the indirect cooling unit operates in a low-pressure cylinder zero-output mode.
Description
Technical Field
The invention belongs to the technical field of operation of steam turbines, and relates to an anti-freezing heat supply system of a refrigerating unit of a low-pressure cylinder zero-output coupling heat storage tank.
Background
Along with the rapid increase of the total installed capacity of new energy power generation equipment in China, the optimization of power production and transmission channel layout and the improvement of new energy consumption and storage capacity are imperative, and thermal power generating units increasingly take on the tasks of flexible operation and large-scale participation in deep peak shaving of a power grid. Therefore, for the traditional thermal power supply unit which operates in the mode of 'heating and power fixation', the contradiction between the peak regulation of the power grid and the heat supply of the thermal power supply unit is more obvious.
The zero-output technology of the low-pressure cylinder is provided, the flexible switching between the extraction condensing working condition and the zero-output working condition of the low-pressure cylinder in the heating season of the heat supply unit is realized, and the heat supply capacity and the electric peak regulation capacity of the steam turbine unit can be greatly improved; the establishment of energy storage equipment such as heat storage tank can be turned into the heat with the electric quantity and store when the heat supply network is in the valley, utilizes high temperature working medium in the heat storage tank to satisfy the heating demand when the heat supply network is at the peak. The two technologies relieve the contradiction between the peak regulation of the power grid of the heat supply unit and the heating to a certain extent, and are widely applied to the heat supply unit in the north at present.
However, for the indirect air cooling unit, the backpressure is low (generally about 4kPa to 5.5kPa) in the low-pressure cylinder zero-output operation mode, only a small amount of cooling steam is introduced into the unit, the cooling of the sector of the indirect cooling tower is enhanced when the low-pressure cylinder zero-output operation mode is performed, and the freezing crack risk of the sector of the indirect cooling tower is easily increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the anti-freezing heat supply system of the indirect cooling tower of the indirect cooling unit with the low-pressure cylinder coupled with the heat storage tank and the system can effectively solve the anti-freezing problem of the indirect cooling tower when the indirect cooling unit operates in the low-pressure cylinder zero-output mode.
In order to achieve the aim, the anti-freezing heat supply system of the indirect cooling unit of the low-pressure cylinder zero-output coupling heat storage tank comprises a heat storage tank, an indirect cooling anti-freezing water inlet valve, a circulating water pump and an indirect air cooling tower;
the high-temperature working medium outlet of the heat storage tank is communicated with the inlet of a circulating water pump through an indirect cooling antifreezing water inlet valve, and the outlet of the circulating water pump is communicated with an indirect air cooling sector in the indirect air cooling tower.
The system also comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder; the main steam outlet of the boiler is communicated with the inlet of the steam turbine high-pressure cylinder, the outlet of the steam turbine high-pressure cylinder is communicated with the inlet of the steam turbine intermediate-pressure cylinder through the reheating side of the boiler, and the steam outlet of the steam turbine intermediate-pressure cylinder is communicated with the steam inlet of the steam turbine low-pressure cylinder.
And a steam outlet of the turbine intermediate pressure cylinder and a steam inlet of the turbine low pressure cylinder are communicated with the low pressure cylinder zero-output cooling steam bypass electric valve through a communicating pipe hydraulic butterfly valve which is communicated in parallel.
The system also comprises a heat supply network water return pipeline, a water feeding pump turbine, a condenser, a heat storage heat exchanger, a heat supply network heater, an indirect cooling anti-freezing water return valve, a heat storage working medium pump and a heat supply network circulating water pump;
the steam extraction port of the turbine intermediate pressure cylinder is divided into three paths, wherein the first path is communicated with the heat release side of the condenser through the water supply pump turbine, the second path is communicated with the heat release side of the condenser through the heat release side of the heat storage heat exchanger, and the third path is communicated with the heat release side of the condenser through the heat release side of the heat supply network heater.
The bottom outlet of the indirect air cooling tower is divided into two paths, wherein one path is communicated with the inlet of the circulating water pump through the heat absorption side of the condenser, the other path is communicated with the low-temperature working medium inlet of the heat storage tank through the indirect cooling anti-freezing water return valve, and the low-temperature working medium outlet of the heat storage tank is communicated with the high-temperature working medium inlet of the heat storage tank through the heat storage working medium pump and the heat absorption side of the heat storage heat exchanger;
a high-temperature working medium outlet of the heat storage tank is communicated with a heat absorption side inlet of the heat supply network heater, a heat supply network water return pipeline is divided into two paths after passing through a heat supply network circulating water pump, one path is communicated with a low-temperature working medium inlet of the heat storage tank, and the other path is communicated with a heat absorption side inlet of the heat supply network heater;
the heat storage tank is an inclined temperature layer type hot water heat storage tank.
The high-temperature working medium outlet of the heat storage tank is communicated with the heat absorption side inlet of the heat supply network heater through a heat supply network water supply valve.
The heat supply network water return pipeline is divided into two paths after passing through the heat supply network circulating water pump, wherein one path is communicated with the low-temperature working medium inlet of the heat storage tank through the heat supply network water return valve, and the other path is communicated with the heat absorption side inlet of the heat supply network heater.
When the unit operates in a low-pressure cylinder zero-output mode, the high-temperature working medium in the heat storage tank is supplemented to the indirect air cooling sector of the indirect air cooling tower, and the heat load requirement of the indirect air cooling sector for preventing freezing in winter is met.
The invention has the following beneficial effects:
when the low-pressure cylinder zero-output coupling heat storage tank indirect cooling unit anti-freezing heat supply system is in specific operation and the unit runs in a low-pressure cylinder zero-output mode, high-temperature working medium in the heat storage tank is supplemented into the indirect air cooling sector of the indirect air cooling tower, the heat load requirement of winter anti-freezing of the indirect air cooling sector is met, and the heat supply capacity of the unit is flexibly adjusted on the basis of solving the winter anti-freezing problem of the indirect cooling tower.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1 is a boiler, 2 is a high-pressure cylinder of a steam turbine, 3 is a medium-pressure cylinder of the steam turbine, 4 is a low-pressure cylinder of the steam turbine, 5 is a water feeding pump steam turbine, 6 is a condenser, 7 is a communicating pipe hydraulic butterfly valve, 8 is a low-pressure cylinder zero-output cooling steam bypass electric valve, 9 is a circulating water pump 9, 10 is an indirect air cooling tower, 11 is an indirect air cooling sector, 12 is a heat storage heat exchanger, 13 is a heat storage tank, 14 is a heat storage working medium pump, 15 is an indirect cooling antifreezing water inlet valve, 16 is an indirect cooling antifreezing water return valve, 17 is a heat network circulating water pump, 18 is a heat network heater, 19 is a heat network water supply valve, and 20 is a heat network water return valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the antifreeze heating system of the indirect cooling unit of the low-pressure cylinder zero-output coupling heat storage tank of the invention comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine intermediate-pressure cylinder 3, a turbine low-pressure cylinder 4, a water supply pump turbine 5, a condenser 6, a communicating pipe hydraulic butterfly valve 7, a low-pressure cylinder zero-output cooling steam bypass electric valve 8, a circulating water pump 9, an indirect air cooling tower 10, an indirect air cooling fan section 11, a heat storage heat exchanger 12, a heat storage tank 13, a heat storage working medium pump 14 and an indirect cooling antifreeze water inlet valve 15; an indirect cooling antifreezing water return valve 16, a heat supply network circulating water pump 17, a heat supply network heater 18, a heat supply network water supply valve 19 and a heat supply network water return valve 20;
the main steam outlet of the boiler 1 is communicated with the inlet of the high-pressure turbine cylinder 2, the outlet of the high-pressure turbine cylinder 2 is communicated with the inlet of the intermediate-pressure turbine cylinder 3 through the reheating side of the boiler 1, and the steam outlet of the intermediate-pressure turbine cylinder 3 and the steam inlet of the low-pressure turbine cylinder 4 are communicated with a zero-output cooling steam bypass electric valve 8 through a communicating pipe hydraulic butterfly valve 7 which is communicated in parallel.
The high-temperature working medium outlet of the heat storage tank 13 is communicated with the inlet of the circulating water pump 9 through an indirect cooling anti-freezing water inlet valve 15, and the outlet of the circulating water pump 9 is communicated with the indirect air cooling sector 11 in the indirect air cooling tower 10. The bottom outlet of the indirect air cooling tower 10 is divided into two paths, wherein one path is communicated with the inlet of the circulating water pump 9 through the heat absorption side of the condenser 6, the other path is communicated with the low-temperature working medium inlet of the heat storage tank 13 through an indirect cooling anti-freezing water return valve 16, and the low-temperature working medium outlet of the heat storage tank 13 is communicated with the high-temperature working medium inlet of the heat storage tank 13 through a heat storage working medium pump 14 and the heat absorption side of the heat storage heat exchanger 12.
The high temperature working medium outlet of the heat storage tank 13 is communicated with the heat absorption side inlet of the heat supply network heater 18 through a heat supply network water supply valve 19, the heat supply network water return pipeline is divided into two paths after passing through a heat supply network circulating water pump 17, one path is communicated with the low temperature working medium inlet of the heat storage tank 13 through a heat supply network water return valve 20, and the other path is communicated with the heat absorption side inlet of the heat supply network heater 18.
The steam extraction port of the turbine intermediate pressure cylinder 3 is divided into three paths, wherein the first path is communicated with the heat release side of the condenser 6 through a water supply pump turbine 5, the second path is communicated with the heat release side of the condenser 6 through the heat release side of the heat storage heat exchanger 12, and the third path is communicated with the heat release side of the condenser 6 through the heat release side of the heat supply network heater 18.
The heat storage tank 13 is a thermocline type hot water heat storage tank, and the heat storage working medium is water.
In the low-pressure cylinder zero-output operation mode, the communicating pipe hydraulic butterfly valve 7 is closed, the low-pressure cylinder zero-output cooling steam bypass electric valve 8 is opened, and the extracted steam of the steam turbine intermediate pressure cylinder 3 is divided into three paths which respectively enter the water supply pump steam turbine 5, the heat storage heat exchanger 12 and the heating network heater 18.
The extracted steam of the steam turbine intermediate pressure cylinder 3 enters a water feeding pump steam turbine 5 to do work and become hydrophobic, and then enters a condenser 6; the extracted steam of the turbine intermediate pressure cylinder 3 is changed into hydrophobic steam after releasing heat through the heat storage heat exchanger 12, and then enters the condenser 6; the extracted steam of the steam turbine intermediate pressure cylinder 3 is changed into hydrophobic steam after being released heat through the heating network heater 18, and then enters the condenser 6.
The working process of the invention is as follows:
when the invention is operated, the invention operates according to the following three heating modes according to the heating demand of the heating network.
When the demand of the heat supply network is small, the unit operates in a traditional steam extraction and heat supply mode, at the moment, a communicating pipe hydraulic butterfly valve 7 is opened, a low-pressure cylinder zero-output cooling steam bypass electric valve 8 is closed, a heat supply network water supply valve 19 and a heat supply network water return valve 20 are closed, an intercooling anti-freezing water inlet valve 15 and an intercooling anti-freezing water return valve 16 are kept closed, the low-temperature working medium in a heat storage tank 13 is heated through the redundant heat supply steam extraction of the unit to generate a high-temperature working medium, and the high-temperature working medium is stored in the heat storage tank 13.
When the heat supply demand of the heat supply network is increased rapidly in a short time, the unit operates in a traditional steam extraction and heat supply mode, at the moment, the heat supply network water supply valve 19 and the heat supply network water return valve 20 are opened, the high-temperature working medium in the heat storage tank 13 is used for meeting the heat supply demand of the short-term increase of the heat supply network side, and the intercooling antifreezing water inlet valve 15 and the intercooling antifreezing water return valve 16 are kept closed.
When the demand of the heat supply network is stable and large, the unit operates in a low-pressure cylinder zero-output mode, at the moment, the indirect cooling anti-freezing water inlet valve 15 and the indirect cooling anti-freezing water return valve 16 are opened, and the high-temperature working medium in the heat storage tank 13 is supplemented into the indirect air cooling sector 11 of the indirect air cooling tower 10 in the low-pressure cylinder zero-output mode, so that the heat load requirement of the indirect air cooling sector 11 for preventing freezing in winter is met, and at the moment, the heat supply network water supply valve 19 and the heat supply network water return valve 20 are closed.
The invention realizes the flexible adjustment of the unit operation mode according to the heat supply demand of the heat supply network, and simultaneously can solve the anti-freezing problem of the indirect air cooling tower 10 when the indirect cooling unit operates in the low-pressure cylinder zero-output mode.
Claims (4)
1. A cold unit anti-freezing heat supply method of a low-pressure cylinder zero-output coupling heat storage tank is characterized in that a cold unit anti-freezing heat supply system based on the low-pressure cylinder zero-output coupling heat storage tank comprises a heat storage tank (13), an inter-cooling anti-freezing water inlet valve (15), a circulating water pump (9) and an indirect air cooling tower (10);
the high-temperature working medium outlet of the heat storage tank (13) is communicated with the inlet of a circulating water pump (9) through an indirect cooling antifreezing water inlet valve (15), and the outlet of the circulating water pump (9) is communicated with an indirect air cooling sector (11) in an indirect air cooling tower (10);
the system also comprises a boiler (1), a steam turbine high-pressure cylinder (2), a steam turbine intermediate-pressure cylinder (3) and a steam turbine low-pressure cylinder (4); the main steam outlet of the boiler (1) is communicated with the inlet of the steam turbine high-pressure cylinder (2), the outlet of the steam turbine high-pressure cylinder (2) is communicated with the inlet of the steam turbine intermediate-pressure cylinder (3) through the heat recovery side of the boiler (1), and the steam outlet of the steam turbine intermediate-pressure cylinder (3) is communicated with the steam inlet of the steam turbine low-pressure cylinder (4);
a steam outlet of the turbine intermediate pressure cylinder (3) is communicated with a steam inlet of the turbine low pressure cylinder (4) through a communicating pipe hydraulic butterfly valve (7) which is communicated in parallel and is communicated with a low pressure cylinder zero-output cooling steam bypass electric valve (8);
the system also comprises a heat supply network water return pipeline, a water feeding pump turbine (5), a condenser (6), a heat storage heat exchanger (12), a heat supply network heater (18), an indirect cooling anti-freezing water return valve (16), a heat storage working medium pump (14) and a heat supply network circulating water pump (17);
the steam extraction port of the steam turbine intermediate pressure cylinder (3) is divided into three paths, wherein the first path is communicated with the heat release side of the condenser (6) through a water feed pump steam turbine (5), the second path is communicated with the heat release side of the condenser (6) through the heat release side of the heat storage heat exchanger (12), and the third path is communicated with the heat release side of the condenser (6) through the heat release side of the heat supply network heater (18);
the bottom outlet of the indirect air cooling tower (10) is divided into two paths, wherein one path is communicated with the inlet of a circulating water pump (9) through the heat absorption side of a condenser (6), the other path is communicated with the low-temperature working medium inlet of a heat storage tank (13) through an indirect cooling antifreezing return valve (16), and the low-temperature working medium outlet of the heat storage tank (13) is communicated with the high-temperature working medium inlet of the heat storage tank (13) through a heat storage working medium pump (14) and the heat absorption side of a heat storage heat exchanger (12);
a high-temperature working medium outlet of the heat storage tank (13) is communicated with a heat absorption side inlet of the heat supply network heater (18), a heat supply network water return pipeline is divided into two paths after passing through a heat supply network circulating water pump (17), one path is communicated with a low-temperature working medium inlet of the heat storage tank (13), and the other path is communicated with a heat absorption side inlet of the heat supply network heater (18);
when the unit operates in a low-pressure cylinder zero-output mode, high-temperature working medium in the heat storage tank (13) is supplemented into an indirect air cooling sector (11) of the indirect air cooling tower (10), so that the heat load requirement of the indirect air cooling sector (11) for preventing freezing in winter is met;
the method comprises the following steps:
when the demand of heat supply of a heat supply network is small, the unit operates in a traditional steam extraction and heat supply mode, at the moment, a communicating pipe hydraulic butterfly valve (7) is opened, a low-pressure cylinder zero-output cooling steam bypass electric valve (8) is closed, a heat supply network water supply valve (19) and a heat supply network water return valve (20) are closed, an intercooling anti-freezing water inlet valve (15) and an intercooling anti-freezing water return valve (16) are kept closed, low-temperature working media in a heat storage tank (13) are heated through redundant heat supply steam extraction of the unit to generate high-temperature working media, and the high-temperature working media are stored in the heat storage tank (13);
when the heat supply demand of the heat supply network is suddenly increased in a short time, the unit operates in a traditional steam extraction and heat supply mode, at the moment, a water supply valve (19) of the heat supply network and a water return valve (20) of the heat supply network are opened, the heat supply demand of the short-term sudden increase of the heat supply network side is met by using a high-temperature working medium in a heat storage tank (13), and an intercooling anti-freezing water inlet valve (15) and an intercooling anti-freezing water return valve (16) are kept closed;
when the demand of the heat supply network is stable and large, the unit operates in a low-pressure cylinder zero-output mode, at the moment, the indirect cooling anti-freezing water inlet valve (15) and the indirect cooling anti-freezing water return valve (16) are opened, and high-temperature working medium in the heat storage tank (13) is supplemented into the indirect air cooling section (11) of the indirect air cooling tower (10) in the low-pressure cylinder zero-output mode, so that the heat load requirement of the indirect air cooling section (11) for preventing freezing in winter is met, and at the moment, the water supply valve (19) of the heat supply network and the water return valve (20) of the heat supply network are closed.
2. The antifreeze heating method for the indirect cooling unit of the low-pressure cylinder zero-output coupled heat storage tank as claimed in claim 1, wherein the heat storage tank (13) is a thermocline hot water heat storage tank.
3. The antifreeze heating method of the indirect cooling unit of the low-pressure cylinder zero-output coupled heat storage tank as claimed in claim 1, characterized in that the high-temperature working medium outlet of the heat storage tank (13) is communicated with the heat absorption side inlet of the heat network heater (18) through a heat network water supply valve (19).
4. The antifreeze heating method of the indirect cooling unit of the low-pressure cylinder zero-output coupled heat storage tank as claimed in claim 1, wherein the heat supply network water return pipeline is divided into two paths after passing through the heat supply network circulating water pump (17), one path is communicated with the low-temperature working medium inlet of the heat storage tank (13) through the heat supply network water return valve (20), and the other path is communicated with the heat absorption side inlet of the heat supply network heater (18).
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| CN114198801B (en) * | 2021-12-13 | 2022-12-27 | 西安热工研究院有限公司 | Low-pressure cylinder zero-output heat supply system and method |
| CN114776401A (en) * | 2022-05-23 | 2022-07-22 | 西安热工研究院有限公司 | Operation optimization method and system for dry-wet combined cold end |
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