CN210509309U - Steam complementary energy utilization coupling steam extraction heat supply system for thermoelectric unit electric power peak regulation - Google Patents
Steam complementary energy utilization coupling steam extraction heat supply system for thermoelectric unit electric power peak regulation Download PDFInfo
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- CN210509309U CN210509309U CN201920384849.1U CN201920384849U CN210509309U CN 210509309 U CN210509309 U CN 210509309U CN 201920384849 U CN201920384849 U CN 201920384849U CN 210509309 U CN210509309 U CN 210509309U
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Abstract
The utility model discloses a steam complementary energy utilizes coupling steam extraction heating system for coal-fired thermoelectric unit electric power peak shaving belongs to combined heat and power generation technical field. The system comprises: the system comprises a steam turbine high-pressure cylinder, a reheater, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder, a steam generator, a pressure matcher, a deaerator, a second feed pump and an industrial heat consumer; the steam generator uses hot re-steam from the reheater as a heat source to heat low-temperature feed water from the deaerator to produce high-pressure steam, and the high-pressure steam is used as a high-pressure steam source of the pressure matcher to drive industrial extraction steam from a steam turbine intermediate pressure cylinder to produce steam required by industrial heat users. The utility model discloses a coupling of pressure matcher and steam generator and original industry steam extraction mode for coal-fired thermoelectric unit homoenergetic when high, low-load operation satisfies external steam supply demand effectively, realizes coal-fired thermoelectric unit's electric power peak regulation. Therefore, the utility model has great practical application value.
Description
Technical Field
The utility model belongs to the technical field of the combined heat and power generation, concretely relates to a steam complementary energy utilizes coupling steam extraction heating system for coal-fired thermoelectric generator group electric power peak shaving.
Background
At present, to the steam power plant that has realized industry steam extraction central heating in the early stage, because the heat supply technique is simple extensive, energy loss is serious for steam power plant's comprehensive energy utilization efficiency can't further improve, and the profit is not realized to many steam power plants that have carried out industry heat supply, the condition of loss appears even. The main reason for this phenomenon is that the heat supply design of the unit is designed according to the working conditions, the load fluctuation of the unit is frequent in the actual operation, especially when the unit is in low-load operation, in order to meet the steam parameters required by industrial heat supply, throttling and other modes are usually adopted, the energy loss is very serious, and therefore the profitability of the thermoelectric unit cannot be realized.
Currently, the main patented technologies in this field: (1) the middle-low pressure communicating butterfly valve adjusting and combining hot press middle-low pressure industrial steam supply method and system patent No. 201610320911.1 and (2) novel combined heat and power steam turbine patent No. 200810013170.8 have the following technical limitations that 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 a hot press or a pressure matcher are not adjustable, so that the efficiency of the hot press or the pressure matcher cannot be improved. Therefore, the two patent technologies have certain limitations in improving energy efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in design, the dependable performance is favorable to realizing that the steam complementary energy of coal-fired thermoelectric unit electric power peak shaving utilizes coupling steam extraction heating system.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a steam complementary energy utilization coupling steam extraction heating system of thermoelectric unit electric power peak shaving which characterized in that, it includes: the steam turbine high-pressure cylinder, the reheater, the steam turbine intermediate-pressure cylinder, the steam turbine low-pressure cylinder, the steam generator, the pressure matcher, the deaerator, the second feed pump and the industrial heat consumer, wherein a steam outlet of the steam turbine high-pressure cylinder is connected with a steam inlet of the reheater, a steam outlet of the reheater is connected with a steam inlet of the steam turbine intermediate-pressure cylinder through a hot re-steam pipe, a first valve is installed on the hot re-steam pipe, a steam outlet of the steam turbine intermediate-pressure cylinder is connected with a steam inlet of the steam turbine low-pressure cylinder through a medium-low pressure communicating pipe, a hydraulic butterfly valve is installed on the medium-low pressure communicating pipe, a steam outlet of the reheater is connected with a high-temperature steam inlet of the steam generator through a hot re-steam branch pipe, a second valve is installed on the hot re-steam branch pipe, a low-temperature steam outlet of the steam generator is connected with the industrial feed steam pipe through a 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, and a fourth valve is arranged on the high-pressure steam pipe, an industrial steam extraction opening of the steam turbine intermediate pressure cylinder is connected with an industrial steam supply pipe through an industrial steam extraction pipe, and a six-valve is arranged on the industrial steam extraction pipe, the industrial steam extraction port of the steam turbine intermediate pressure cylinder is also connected with the low-pressure steam inlet of the pressure adapter through an industrial steam extraction branch pipe, a seventh valve is arranged on the industrial steam extraction branch pipe, a middle-pressure steam outlet of the pressure matcher is connected with an industrial steam supply pipe through a second steam pipe, and the second steam pipe is provided with a eighth valve, and the steam outlet end of the industrial steam supply pipe is connected with an industrial heat user.
Furthermore, the low-temperature feed water required by the steam generator is from a deaerator of a coal-fired thermoelectric power unit, and the boiler feed water heated by low-pressure regenerative steam extraction of a steam turbine intermediate pressure cylinder in the deaerator is used as the low-temperature feed water, so that high-parameter steam energy consumed in the steam generator is reduced.
Further, the steam generator produces high pressure steam by heating low temperature feedwater from a deaerator using hot reheat steam from a reheater as a heat source.
Further, the pressure matcher uses high-pressure steam from a steam generator to drive industrial extraction steam from a steam turbine intermediate pressure cylinder to produce intermediate-pressure steam required by industrial heat users.
Further, the steam required by the industrial heat consumer comes from industrial extraction steam of a steam turbine intermediate pressure cylinder, intermediate pressure steam produced by a pressure matcher and hot re-steam after being subjected to temperature reduction by a steam generator.
The method for regulating the steam complementary energy of the electric peak regulation of the thermoelectric unit by using the coupled steam extraction heat supply system comprises the following steps:
when the coal-fired thermoelectric unit is in high-load operation, 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 steam turbine intermediate pressure cylinder 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 operates at low load, at the moment:
the method comprises the steps of closing a sixth valve, opening a hydraulic butterfly valve, opening and adjusting a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a seventh valve and an eighth valve, conveying hot re-steam from a reheater to a steam generator through a hot re-steam branch pipe, heating low-temperature feed water from a deaerator to generate high-pressure steam, conveying the hot re-steam subjected to temperature reduction by the steam generator to an industrial heat user through a first steam pipe and an industrial steam supply pipe in sequence, conveying the high-pressure steam generated by the steam generator to a pressure matcher through the high-pressure steam pipe, driving industrial steam extraction from a steam turbine intermediate pressure cylinder to generate intermediate-pressure steam, and conveying the intermediate-pressure steam generated by the pressure matcher to the industrial heat user through a second steam pipe and an industrial steam supply pipe in sequence.
In the method for adjusting the steam complementary energy of the electric peak regulation of the thermoelectric unit by using the coupled steam extraction heat supply system, the method comprises the following steps:
in the process that the coal-fired thermoelectric unit participates in power peak regulation, when the coal-fired thermoelectric unit runs at a high load, only industrial extraction steam of a steam turbine intermediate pressure cylinder is used as steam required by an industrial heat user, and when the coal-fired thermoelectric unit runs at a low load, only intermediate pressure steam produced by a pressure matcher and hot re-steam after temperature reduction by a steam generator are used as steam required by the industrial heat user.
Compared with the prior art, the utility model, have following advantage and effect: reasonable in design, simple structure, the dependable performance, the steam complementary energy of rational design thermoelectric unit electric power peak shaving utilizes coupling steam extraction heating system to realize: (1) the hot re-steam from the reheater is used for producing high-pressure steam, and the superheat degree of the hot re-steam is fully recycled; (2) boiler feed water heated by low-pressure regenerative steam extraction of a steam turbine intermediate pressure cylinder in a deaerator is used as low-temperature feed water, so that high-parameter steam energy consumed in a steam generator is reduced; (3) the parameter matching with the pressure matcher is realized by adjusting the high-pressure steam parameters 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 external steam supply requirements can be effectively met when the coal-fired thermoelectric unit operates at high load and low load, and the power peak regulation of the coal-fired thermoelectric unit is realized. Therefore, the utility model has great practical application value.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a heat recovery system of a coal-fired thermoelectric power unit in an embodiment of the present 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 are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 2, the steam complementary energy utilization coupled steam extraction heating system for peak shaving of the thermoelectric power unit in the embodiment includes: the steam turbine comprises a steam turbine high-pressure cylinder 1, a reheater 2, a steam turbine intermediate-pressure cylinder 3, a steam turbine low-pressure cylinder 4, a steam generator 5, a pressure matcher 6, a deaerator 7, a second water feed pump 8 and an industrial heat user 9, wherein a steam outlet of the steam turbine high-pressure cylinder 1 is connected with a steam inlet of the reheater 2, a steam outlet of the reheater 2 is connected with a steam inlet of the steam turbine intermediate-pressure cylinder 3 through a hot re-steam pipe 22, a first valve 11 is installed on the hot re-steam pipe 22, a steam outlet of the steam turbine intermediate-pressure cylinder 3 is connected with a steam inlet of the steam turbine low-pressure cylinder 4 through a medium-low pressure communicating pipe 21, a hydraulic butterfly valve 12 is installed on the medium-low pressure communicating pipe 21, a steam outlet of the reheater 2 is further connected with a high-temperature steam inlet of the steam generator 5 through a hot re-steam branch pipe 23, a second valve 13 is installed on the hot re-steam branch pipe 23, a low-temperature, a fifth valve 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 third valve 14 and a second water supply pump 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 fourth valve 15 is arranged on the high-pressure steam pipe 25, an industrial steam outlet of the steam turbine intermediate 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 intermediate 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 seventh valve 18 is arranged on the industrial steam extraction branch pipe 28, and the medium-pressure steam outlet of the pressure matcher 6 is connected with the industrial steam supply pipe 30 through a second steam pipe 29, and an eighth valve 19 is installed on the second steam pipe 29, and the steam outlet end of the industrial steam supply pipe 30 is connected with the industrial heat consumer 9.
In the embodiment, the low-temperature feed water required by the steam generator 5 comes from a deaerator 7 of a coal-fired thermoelectric power unit, and the boiler feed water heated by low-pressure regenerative steam extraction of a steam turbine intermediate pressure cylinder 3 in the deaerator 7 is used as the low-temperature feed water, so that 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 matching box 6 drives the industrial extraction steam from the steam turbine intermediate pressure cylinder 3 by using the high pressure steam from the steam generator 5 to produce the intermediate pressure steam required by the industrial heat consumer 9. The industrial extraction pressure of the steam turbine intermediate pressure cylinder 3 in the low-load operation of the coal-fired thermoelectric unit is lower than that of the steam turbine intermediate pressure cylinder 3 in the rated working condition operation of the coal-fired thermoelectric unit, so that the requirement of an industrial heat user 9 cannot be met.
In the present embodiment, the steam required by the industrial heat consumer 9 comes from the industrial extraction steam of the steam turbine intermediate pressure cylinder 3, the medium pressure steam produced by the pressure adapter 6 and the hot re-steam after the temperature reduction by the steam generator 5.
The adjustment method related to the embodiment is as follows:
when the coal-fired thermoelectric unit is in high-load operation, at the moment: opening a first valve 11 and a hydraulic butterfly valve 12, opening and adjusting a sixth valve 17, and conveying the industrial extraction steam of the steam turbine intermediate pressure cylinder 3 to an industrial heat consumer 9 through an industrial extraction steam pipe 27 and an industrial steam supply pipe 30 in sequence;
when the coal-fired thermoelectric unit operates at low load, at the moment: the sixth valve 17 is closed, the hydraulic butterfly valve 12 is opened, the first valve 11, the second valve 13, the third valve 14, the fourth valve 15, the fifth valve 16, the seventh valve 18 and the eighth valve 19 are opened and adjusted, hot re-steam from the reheater 2 is conveyed to the steam generator 5 through the hot re-steam branch pipe 23, low-temperature feed water from the deaerator 7 is heated to produce high-pressure steam, the hot re-steam after temperature reduction of the steam generator 5 is conveyed to the industrial heat consumer 9 through the first steam pipe 26 and the industrial steam supply pipe 30 in sequence, the high-pressure steam produced by the steam generator 5 enters the pressure matcher 6 through the high-pressure steam pipe 25 to drive industrial steam extraction from the steam turbine intermediate pressure cylinder 3 to produce intermediate-pressure steam, and the intermediate-pressure steam produced by the pressure matcher 6 is conveyed to the industrial heat consumer 9 through the second steam pipe 29 and the industrial steam supply pipe 30 in sequence.
In the specific operation method of the embodiment, in the process that the coal-fired thermoelectric power unit participates in power peak shaving, when the coal-fired thermoelectric power unit is in high-load operation, only the industrial extraction steam of the intermediate pressure cylinder 3 of the steam turbine is used as the steam required by the industrial heat consumer 9, and when the coal-fired thermoelectric power unit is in low-load operation, only the medium-pressure steam produced by the pressure matcher 6 and the hot re-steam after being subjected to temperature reduction by the steam generator 5 are used as the steam required by the industrial heat consumer 9.
Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (1)
1. The utility model provides a steam complementary energy utilization coupling steam extraction heating system of thermoelectric unit electric power peak shaving which characterized in that, it includes: the steam turbine high-pressure steam generator comprises a steam turbine high-pressure cylinder (1), a reheater (2), a steam turbine intermediate-pressure cylinder (3), a steam turbine low-pressure cylinder (4), a steam generator (5), a pressure matcher (6), a deaerator (7), a second water feed pump (8) and an industrial heat user (9), wherein a steam outlet of the steam turbine high-pressure cylinder (1) is connected with a steam inlet of the reheater (2), a steam outlet of the reheater (2) is connected with a steam inlet of the steam turbine intermediate-pressure cylinder (3) through a hot re-steam pipe (22), a first valve (11) is installed on the hot re-steam pipe (22), a steam outlet of the steam turbine intermediate-pressure cylinder (3) is connected with a steam inlet of the steam turbine low-pressure cylinder (4) through a medium-low-pressure communicating pipe (21), a hydraulic butterfly valve (12) is installed on the medium-low-pressure communicating pipe (21), and a steam outlet of the reheater (2) is connected with a high-temperature steam inlet of the steam generator, and install No. two valve (13) on hot steam branch pipe (23) again, the low temperature steam outlet of steam generator (5) is connected with industry steam supply pipe (30) through first steam pipe (26), and installs No. five valve (16) on first steam pipe (26), the low temperature water inlet of steam generator (5) passes through water feed pipe (24) and is connected with the delivery port of oxygen-eliminating device (7), and installs No. three valve (14) and No. two feed pump (8) along water flow direction on water feed pipe (24) in proper order, the high pressure steam outlet of steam generator (5) passes through high pressure steam pipe (25) and is connected with the high pressure steam inlet of pressure adapter (6), and installs No. four valve (15) on high pressure steam pipe (25), the industry steam extraction mouth of steam turbine intermediate pressure cylinder (3) is connected with industry steam supply pipe (30) through industry steam extraction pipe (27), and install No. six valves (17) on industry extraction pipe (27), the industry extraction steam vent of steam turbine intermediate pressure cylinder (3) still is connected with the low pressure steam inlet of pressure adapter (6) through industry extraction branch pipe (28), and installs No. seven valves (18) on industry extraction branch pipe (28), the middling pressure steam outlet of pressure adapter (6) is passed through second steam pipe (29) and is connected with industry steam supply pipe (30), and installs No. eight valves (19) on second steam pipe (29), the play steam end and the industry heat user (9) of industry steam supply pipe (30) are connected.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065520A (en) * | 2020-09-11 | 2020-12-11 | 国电科学技术研究院有限公司 | Cold and hot re-cooperative steam supply system and method |
| CN112145244A (en) * | 2020-09-22 | 2020-12-29 | 西安热工研究院有限公司 | System and method for improving water supply temperature and steam supply capacity of coal-fired power generating unit |
| CN112344413A (en) * | 2020-10-30 | 2021-02-09 | 广西电网有限责任公司电力科学研究院 | Low-pressure steam source boosting and heat supplying method for cogeneration unit |
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2019
- 2019-03-26 CN CN201920384849.1U patent/CN210509309U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065520A (en) * | 2020-09-11 | 2020-12-11 | 国电科学技术研究院有限公司 | Cold and hot re-cooperative steam supply system and method |
| CN112065520B (en) * | 2020-09-11 | 2021-04-27 | 国电科学技术研究院有限公司 | Cold and hot re-cooperative steam supply system and method |
| CN112145244A (en) * | 2020-09-22 | 2020-12-29 | 西安热工研究院有限公司 | System and method for improving water supply temperature and steam supply capacity of coal-fired power generating unit |
| CN112344413A (en) * | 2020-10-30 | 2021-02-09 | 广西电网有限责任公司电力科学研究院 | Low-pressure steam source boosting and heat supplying method for cogeneration unit |
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