CN110056402B - Steam complementary energy utilization coupling steam extraction heat supply system and adjusting method - Google Patents
Steam complementary energy utilization coupling steam extraction heat supply system and adjusting method Download PDFInfo
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- 238000000605 extraction Methods 0.000 title claims abstract description 55
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000295 complement effect Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 230000009467 reduction Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000004064 recycling Methods 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
- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—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 of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—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 of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K7/34—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 of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/44—Use of steam for feed-water heating and another purpose
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention discloses a steam complementary energy utilization coupling steam extraction heating system for coal-fired thermoelectric unit power peak regulation and an adjusting method, and belongs to the technical field of cogeneration. The system comprises: the system comprises a steam turbine high-pressure cylinder, a reheater, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder, a steam generator, a pressure matcher, a deaerator, a second water supply pump and an industrial heat user; the steam generator uses the hot re-steam from the reheater as a heat source to heat the low-temperature water supply from the deaerator to produce high-pressure steam, and the high-pressure steam source is used as a high-pressure steam source of the pressure matcher to drive industrial steam extraction from the medium-pressure cylinder of the steam turbine to produce steam required by industrial heat users. According to the invention, through the coupling of the pressure matcher and the steam generator with the original industrial steam extraction mode, the external steam supply requirements can be effectively met when the coal-fired thermoelectric unit runs under high and low loads, and the electric peak regulation of the coal-fired thermoelectric unit is realized. Therefore, the invention has great practical application value.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a steam complementary energy utilization coupling steam extraction heat supply system for power peak regulation of a coal-fired thermoelectric unit and an adjusting method.
Background
Currently, for a thermal power plant which has realized industrial steam extraction central heating in early stage, because the heating technology is simple and extensive, the energy loss is serious, so that the comprehensive energy utilization efficiency of the thermal power plant cannot be further improved, and many thermal power plants which have performed industrial heating do not realize profit, and even have the condition of loss. The main reason for this phenomenon is that the heat supply design of the unit is designed according to working conditions, and in actual operation, the load fluctuation of the unit is frequent, especially when the unit is in low load operation, in order to meet the steam parameters required by industrial heat supply, the energy loss caused by throttling and other modes is serious, so that the thermoelectric unit cannot realize profitability.
Currently, the main patent technology in the field is as follows: (1) The technical limitations of the low-pressure industrial steam supply method and system of the medium-low pressure communication butterfly valve regulation combined hot press (patent number 201610320911.1) and (2) the novel cogeneration steam turbine (patent number 200810013170.8) exist, firstly, the superheat degree of high-parameter steam is not fully utilized, and secondly, the temperature parameters of high-pressure steam and low-pressure steam of the hot press or the pressure matcher are not adjustable, and the efficiency number of the hot press or the pressure matcher cannot be improved. Therefore, the two patent technologies have certain limitations in terms of improving energy efficiency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the steam complementary energy utilization coupling steam extraction heat supply system and the adjusting method which are reasonable in design, reliable in performance and beneficial to realizing the power peak regulation of the coal-fired thermoelectric unit.
The invention solves the problems by adopting the following technical scheme: the utility model provides a complementary energy utilization coupling steam extraction heating system that is used for coal-fired thermoelectric unit electric power peak shaving, its characterized in that includes: the steam turbine high-pressure cylinder, the reheater, the steam turbine medium-pressure cylinder, the steam turbine low-pressure cylinder, the steam generator, the pressure matcher, the deaerator, the second water supply pump and the industrial heat user, the steam outlet of the steam turbine high-pressure cylinder is connected with the steam inlet of the reheater, the steam outlet of the reheater is connected with the steam inlet of the steam turbine medium-pressure cylinder through a hot steam pipe, a first valve is arranged on the hot steam pipe, the steam outlet of the steam turbine medium-pressure cylinder is connected with the steam inlet of the steam turbine low-pressure cylinder through a medium-low pressure communicating pipe, a hydraulic butterfly valve is arranged on the medium-low pressure communicating pipe, the steam outlet of the reheater is also connected with the high-temperature steam inlet of the steam generator through a hot steam branch pipe, the second valve is arranged on the hot steam branch pipe, the low-temperature steam outlet of the steam generator is connected with the industrial steam supply pipe through a first steam pipe, a fifth valve is arranged on the first steam pipe, the low-temperature water inlet of the steam generator is connected with the water outlet of the deaerator through a water supply pipe, a third valve and a second water supply pump are sequentially arranged on the water supply pipe along the water flowing direction, the high-pressure steam outlet of the steam generator is connected with the high-pressure steam inlet of the pressure matcher through a high-pressure steam pipe, a fourth valve is arranged on the high-pressure steam pipe, the industrial steam outlet of the steam turbine medium-pressure cylinder is connected with the industrial steam supply pipe through the industrial steam extraction pipe, a sixth valve is arranged on the industrial steam extraction pipe, the industrial steam outlet of the steam turbine medium-pressure cylinder is also connected with the low-pressure steam inlet of the pressure matcher through an industrial steam extraction branch pipe, a seventh valve is arranged on the industrial steam extraction branch pipe, the medium-pressure steam outlet of the pressure matcher is connected with the industrial steam supply pipe through a second steam pipe, and a eighth valve is arranged on the second steam pipe, the steam outlet end of the industrial steam supply pipe is connected with an industrial heat user.
Furthermore, the low-temperature water supply needed by the steam generator comes from a deaerator of the coal-fired thermoelectric unit, and boiler water which is heated by low-pressure backheating steam extraction of a middle pressure cylinder of a steam turbine in the deaerator is used as low-temperature water supply, so that high-parameter steam energy consumed in the steam generator is reduced.
Further, the steam generator uses the hot re-steam from the reheater as a heat source to produce high pressure steam by heating the low temperature feedwater from the deaerator.
Further, the pressure matcher drives industrial extraction steam from the intermediate pressure cylinder of the steam turbine by using high-pressure steam from the steam generator to produce intermediate pressure steam required by industrial heat users.
Furthermore, the steam required by the industrial heat user is from industrial steam extraction of a middle pressure cylinder of the steam turbine, middle pressure steam produced by a pressure matcher and hot re-steam after the temperature is reduced by a steam generator.
The adjusting method for the steam complementary energy utilization coupling steam extraction heat supply system for the electric power peak regulation of the coal-fired thermoelectric unit comprises the following steps:
when the coal-fired thermoelectric unit operates under high load, at the moment:
opening a first valve and a hydraulic butterfly valve, opening and adjusting a sixth valve, and conveying industrial steam extraction of a pressure cylinder in the steam turbine to an industrial heat user through an industrial steam extraction pipe and an industrial steam supply pipe in sequence;
when the coal-fired thermoelectric unit runs under low load, at the moment:
closing a valve No. six, opening a hydraulic butterfly valve, opening and adjusting the valve No. one, the valve No. two, the valve No. three, the valve No. four, the valve No. five, the valve No. seven and the valve No. eight, conveying hot re-steam from a reheater to a steam generator through a hot re-steam branch pipe, heating low-temperature water from a deaerator to produce high-pressure steam, conveying the hot re-steam subjected to temperature reduction through the steam generator to an industrial heat user through a first steam pipe and an industrial steam supply pipe in sequence, enabling the high-pressure steam produced by the steam generator to enter a pressure matcher through the high-pressure steam pipe, driving industrial steam extraction from a middle pressure cylinder of a steam turbine to produce middle-pressure steam, and conveying the middle-pressure steam produced by the pressure matcher to the industrial heat user through a second steam pipe and the industrial steam supply pipe in sequence.
The adjusting method for the steam complementary energy utilization coupling steam extraction heat supply system for the electric power peak regulation of the coal-fired thermoelectric unit comprises the following steps:
in the process of participating in electric power peak regulation, when the coal-fired thermoelectric unit runs under high load, only the industrial steam extraction of the medium-pressure cylinder of the steam turbine is used as the steam required by the industrial heat user, and when the coal-fired thermoelectric unit runs under low load, only the medium-pressure steam produced by the pressure matcher and the hot re-steam cooled by the steam generator are used as the steam required by the industrial heat user.
Compared with the prior art, the invention has the following advantages and effects: the energy-saving steam heating system has the advantages of reasonable design, simple structure and reliable performance, and is used for reasonably designing a steam complementary energy utilization coupling steam extraction heating system for electric power peak regulation of a coal-fired thermoelectric unit, so that the energy-saving steam heating system is realized: (1) Producing high-pressure steam by utilizing the hot re-steam from the reheater, and fully recycling the superheat degree of the hot re-steam; (2) The boiler feed water heated by low-pressure backheating steam extraction through a steam turbine medium-pressure cylinder in the deaerator is used as low-temperature feed water, so that high-parameter steam energy consumed in the steam generator is reduced; (3) The parameter matching with the pressure matcher is realized by adjusting the high-pressure steam parameter produced by the steam generator, so that the performance of the pressure matcher is further improved; (4) Through the coupling of the pressure matcher and the steam generator with the original industrial steam extraction mode, the coal-fired thermoelectric unit can effectively meet the external steam supply requirements during high-load and low-load operation, and the electric power peak regulation of the coal-fired thermoelectric unit is realized. Therefore, the invention has great practical application value.
Drawings
Fig. 1 is a schematic overall structure of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a regenerative system of a coal-fired thermoelectric unit according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1 to 2, the steam complementary energy utilization coupling steam extraction heating system for power peak shaving of a coal-fired thermoelectric unit in the present embodiment includes: the steam turbine high-pressure cylinder 1, the reheater 2, the steam turbine medium-pressure cylinder 3, the steam turbine low-pressure cylinder 4, the steam generator 5, the pressure matcher 6, the deaerator 7, the second water supply pump 8 and the industrial heat user 9, the steam outlet of the steam turbine high-pressure cylinder 1 is connected with the steam inlet of the reheater 2, the steam outlet of the reheater 2 is connected with the steam inlet of the steam turbine medium-pressure cylinder 3 through a hot reheat pipe 22, a first valve 11 is arranged on the hot reheat pipe 22, the steam outlet of the steam turbine medium-pressure cylinder 3 is connected with the steam inlet of the steam turbine low-pressure cylinder 4 through a medium-low pressure communicating pipe 21, a hydraulic butterfly valve 12 is arranged on the medium-low pressure communicating pipe 21, the steam outlet of the reheater 2 is also connected with the high-temperature steam inlet of the steam generator 5 through a hot reheat branch pipe 23, the second valve 13 is arranged on the hot reheat branch pipe 23, the low-temperature steam outlet of the steam generator 5 is connected with the industrial heat supply pipe 30 through a first steam pipe 26, a valve number five 16 is arranged on a first steam pipe 26, a low-temperature water inlet of the steam generator 5 is connected with a water outlet of the deaerator 7 through a water supply pipe 24, a valve number three 14 and a water supply pump number two 8 are sequentially arranged on the water supply pipe 24 along the water flowing direction, a high-pressure steam outlet of the steam generator 5 is connected with a high-pressure steam inlet of the pressure matcher 6 through a high-pressure steam pipe 25, a valve number four 15 is arranged on the high-pressure steam pipe 25, an industrial steam outlet of the steam turbine medium pressure cylinder 3 is connected with an industrial steam supply pipe 30 through an industrial steam extraction pipe 27, a valve number six 17 is arranged on the industrial steam extraction pipe 27, an industrial steam outlet of the steam turbine medium pressure cylinder 3 is also connected with a low-pressure steam inlet of the pressure matcher 6 through an industrial steam extraction branch pipe 28, a valve number seven 18 is arranged on the industrial steam extraction branch pipe 28, the medium pressure steam outlet of the pressure matcher 6 is connected with an industrial steam supply pipe 30 through a second steam pipe 29, a valve No. eight 19 is arranged on the second steam pipe 29, and the steam outlet end of the industrial steam supply pipe 30 is connected with an industrial heat user 9.
In the embodiment, the low-temperature water supply needed by the steam generator 5 comes from the deaerator 7 of the coal-fired thermoelectric unit, and the boiler water supply heated by the low-pressure backheating steam extraction of the middle pressure cylinder 3 of the steam turbine in the deaerator 7 is used as the low-temperature water supply, so that the high-parameter steam energy consumed in the steam generator 5 is reduced; the steam generator 5 uses the hot re-steam from the reheater 2 as a heat source to produce high pressure steam by heating the low temperature feedwater from the deaerator 7.
In the present embodiment, the pressure matcher 6 drives the industrial extraction steam from the turbine intermediate pressure cylinder 3 with high pressure steam from the steam generator 5 to produce intermediate pressure steam required by the industrial heat consumer 9. The industrial extraction pressure of the middle pressure cylinder 3 of the steam turbine is lower than the industrial extraction pressure of the middle pressure cylinder 3 of the steam turbine when the coal-fired thermoelectric unit operates under the rated working condition, and the requirements of the industrial heat users 9 cannot be met.
In this embodiment, the steam required by the industrial heat consumer 9 is derived from the industrial extraction of the turbine intermediate pressure cylinder 3, the intermediate pressure steam produced by the pressure matcher 6 and the hot re-steam after the temperature reduction by the steam generator 5.
The adjustment method according to this embodiment is as follows:
when the coal-fired thermoelectric unit operates under high load, at the moment: opening a valve I11 and a hydraulic butterfly valve 12, opening and adjusting a valve II 17, and conveying industrial steam extraction of the pressure cylinder 3 of the steam turbine to an industrial heat user 9 through an industrial steam extraction pipe 27 and an industrial steam supply pipe 30 in sequence;
when the coal-fired thermoelectric unit runs under low load, at the moment: closing valve number six 17, opening hydraulic butterfly valve 12, opening and adjusting valve number one 11, valve number two 13, valve number three 14, valve number four 15, valve number five 16, valve number seven 18 and valve number eight 19, conveying hot re-steam from reheater 2 to steam generator 5 through hot re-steam branch pipe 23, heating low temperature feedwater from deaerator 7 to produce high pressure steam, conveying the hot re-steam after the temperature reduction of steam generator 5 to industrial heat user 9 through first steam pipe 26 and industrial steam supply pipe 30 in proper order, high pressure steam produced by steam generator 5 enters pressure matcher 6 through high pressure steam pipe 25, driving industrial extraction steam from steam turbine intermediate pressure cylinder 3 to produce intermediate pressure steam, and intermediate pressure steam produced by pressure matcher 6 is conveyed to industrial heat user 9 through second steam pipe 29 and industrial steam supply pipe 30 in proper order.
In the specific operation method of the embodiment, in the process of taking part in the peak shaving of the electric power of the coal-fired thermoelectric unit, when the coal-fired thermoelectric unit is in high-load operation, only the industrial extraction steam of the middle pressure cylinder 3 of the steam turbine is used as the steam required by the industrial heat user 9, and when the coal-fired thermoelectric unit is in low-load operation, only the middle pressure steam produced by the pressure matcher 6 and the heat re-steam after the temperature reduction of the steam generator 5 are used as the steam required by the industrial heat user 9.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (6)
1. The utility model provides a complementary energy utilization coupling steam extraction heating system which characterized in that is used for coal-fired thermoelectric unit electric power peak regulation, and it includes: the steam turbine high-pressure cylinder (1), the reheater (2), the steam turbine medium-pressure cylinder (3), the steam turbine low-pressure cylinder (4), the steam generator (5), the pressure matcher (6), the deaerator (7), the second water supply pump (8) and the industrial heat user (9), the steam outlet of the steam turbine high-pressure cylinder (1) is connected with the steam inlet of the reheater (2), the steam outlet of the reheater (2) is connected with the steam inlet of the steam turbine medium-pressure cylinder (3) through a hot re-steam pipe (22), a first valve (11) is arranged on the hot re-steam pipe (22), the steam outlet of the steam turbine medium-pressure cylinder (3) is connected with the steam inlet of the steam turbine low-pressure cylinder (4) through a medium-low pressure communicating pipe (21), a hydraulic butterfly valve (12) is arranged on the medium-low pressure communicating pipe (21), the steam outlet of the reheater (2) is also connected with the high-temperature inlet of the steam generator (5) through a hot re-steam branch pipe (23), a second valve (13) is arranged on the hot re-steam branch pipe (23), a fifth valve (26) is arranged on the first steam generator (26) and the fifth steam pipe (30), the low-temperature water inlet of the steam generator (5) is connected with the water outlet of the deaerator (7) through a water supply pipe (24), a third valve (14) and a second water supply pump (8) are sequentially arranged on the water supply pipe (24) along the water flow direction, the high-pressure steam outlet of the steam generator (5) is connected with the high-pressure steam inlet of the pressure matcher (6) through a high-pressure steam pipe (25), a fourth valve (15) is arranged on the high-pressure steam pipe (25), the industrial steam outlet of the steam turbine medium-pressure cylinder (3) is connected with an industrial steam supply pipe (30) through an industrial steam extraction pipe (27), a sixth valve (17) is arranged on the industrial steam extraction pipe (27), the industrial steam outlet of the steam turbine medium-pressure cylinder (3) is also connected with the low-pressure steam inlet of the pressure matcher (6) through an industrial steam extraction branch pipe (28), a seventh valve (18) is arranged on the industrial steam extraction branch pipe (28), the medium-pressure outlet of the pressure generator (6) is connected with the industrial steam supply pipe (30) through a second steam extraction pipe (29), and the industrial steam matcher (19) is connected with the industrial steam supply pipe (30) through a second steam supply pipe (30); the low-temperature water supply needed by the steam generator (5) is from a deaerator (7) of the coal-fired thermoelectric unit.
2. The steam complementary energy utilization coupled steam extraction heating system according to claim 1, characterized in that the steam generator (5) utilizes the hot re-steam from the reheater (2) as a heat source to produce high pressure steam by heating the low temperature feedwater from the deaerator (7).
3. The steam complementary energy utilization coupling steam extraction heating system according to claim 1, wherein the pressure matcher (6) utilizes high-pressure steam from the steam generator (5) to drive industrial steam extraction from the steam turbine intermediate pressure cylinder (3) to produce intermediate pressure steam required by industrial heat consumers (9).
4. The steam complementary energy utilization coupling steam extraction and heat supply system according to claim 1, wherein the steam required by the industrial heat user (9) is from industrial steam extraction of a steam turbine intermediate pressure cylinder (3), intermediate pressure steam produced by a pressure matcher (6) and hot re-steam after being subjected to temperature reduction by a steam generator (5).
5. A method for regulating the residual energy of steam by using a coupled steam extraction heating system as claimed in any one of claims 1 to 4, characterized in that the regulating method comprises the following steps:
when the coal-fired thermoelectric unit operates under high load, at the moment:
opening a valve I (11) and a hydraulic butterfly valve (12), opening and adjusting a valve II (17), and conveying industrial steam extraction of a pressure cylinder (3) in the steam turbine to an industrial heat user (9) sequentially through an industrial steam extraction pipe (27) and an industrial steam supply pipe (30);
when the coal-fired thermoelectric unit runs under low load, at the moment:
closing a valve No. 17, opening a hydraulic butterfly valve 12, opening and adjusting a valve No. 11, a valve No. 13, a valve No. 14, a valve No. 15, a valve No. 16, a valve No. 18 and a valve No. eight 19, conveying hot re-steam from a reheater 2 to a steam generator 5 through a hot re-steam branch pipe 23, heating low-temperature water from a deaerator 7 to produce high-pressure steam, conveying the hot re-steam subjected to temperature reduction through the steam generator 5 to an industrial heat user 9 sequentially through a first steam pipe 26 and an industrial steam supply pipe 30, conveying the high-pressure steam generated by the steam generator 5 into a pressure matcher 6 through a high-pressure steam pipe 25, driving industrial steam extracted from a steam turbine medium-pressure cylinder 3 to produce medium-pressure steam, and conveying the medium-pressure steam generated by the pressure matcher 6 to the industrial heat user 9 sequentially through a second steam pipe 29 and the industrial steam supply pipe 30.
6. The method for regulating a steam residual energy utilizing coupling steam extraction heating system according to claim 5, wherein: in the process of participating in electric power peak regulation, when the coal-fired thermoelectric unit runs under high load, only the industrial steam extraction of the middle pressure cylinder (3) of the steam turbine is used as steam required by the industrial heat user (9), and when the coal-fired thermoelectric unit runs under low load, only the middle pressure steam produced by the pressure matcher (6) and the hot re-steam subjected to temperature reduction by the steam generator (5) are used as steam required by the industrial heat user (9).
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