CN114877307A - Double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and working method thereof - Google Patents

Double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and working method thereof Download PDF

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Publication number
CN114877307A
CN114877307A CN202210397215.6A CN202210397215A CN114877307A CN 114877307 A CN114877307 A CN 114877307A CN 202210397215 A CN202210397215 A CN 202210397215A CN 114877307 A CN114877307 A CN 114877307A
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China
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pressure
steam
heater
heat supply
low
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CN202210397215.6A
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Chinese (zh)
Inventor
朱良君
李国敏
马聪
王勇
于鹏峰
龙颜长
姬海宏
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Tianjin Development Branch Of Huadian International Power Co ltd
Huadian Electric Power Research Institute Co Ltd
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Tianjin Development Branch Of Huadian International Power Co ltd
Huadian Electric Power Research Institute Co Ltd
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Priority to CN202210397215.6A priority Critical patent/CN114877307A/en
Publication of CN114877307A publication Critical patent/CN114877307A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
    • F22B33/18—Combinations of steam boilers with other apparatus
    • 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
    • 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
    • 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
    • F01K13/006—Auxiliaries or details not otherwise provided for
    • 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
    • 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
    • F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
    • F22D1/325—Schematic arrangements or control devices therefor
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D1/00—Steam central heating systems
    • F24D1/02—Steam central heating systems operating with live steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D1/00—Steam central heating systems
    • F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2101/00—Electric generators of small-scale CHP systems
    • F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
    • 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 double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and a working method thereof, relates to the technical field of cogeneration heat supply and heating, and aims at solving the problems of stability and safety of a high-parameter and high-flow industrial steam supply heat supply system and the uncertainty of the high-parameter heat supply system in terms of adjustment flexibility and control strategy. The invention effectively realizes the industrial heat supply of the ultrahigh pressure parameter, meets the requirements of the industrial steam of the ultrahigh pressure and large capacity parameters, improves the stability and flexibility of the high-efficiency heat supply of the unit making unit, fully utilizes the high efficiency of the backpressure unit to realize the backpressure operation under the working condition in winter and the partial overflow operation under the working condition in summer, can realize the working condition of stopping the furnace without stopping the furnace, and greatly improves the safety and stability of the heat supply system of the unit making unit.

Description

Double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and working method thereof
Technical Field
The invention relates to the technical field of cogeneration heat supply and heating, in particular to a high-efficiency heat supply system for supplying large-flow and high-parameter industrial steam.
Background
The cogeneration technology is an important measure for realizing energy conservation and emission reduction in the power generation industry of China, a large-capacity and high-parameter coal-fired cogeneration unit is built in batches and put into operation, and currently, "electricity is determined by heat" is a main operation mode of the coal-fired cogeneration unit, so that the comprehensive utilization efficiency of energy is high, the energy is saved, the environment is improved, the heat supply quality is improved, the power supply is increased, and the like. The centralized heating is realized by building a public cogeneration project, the high efficiency of a high-parameter large-capacity unit is fully exerted, meanwhile, the heating and the heat supply are carried out by utilizing low-parameter exhaust steam, the cascade utilization of energy is realized, the energy utilization efficiency can be greatly improved, and the heating and heat supply economical efficiency is improved. However, the stability of high-capacity and high-parameter industrial steam heating is a key for realizing cogeneration, and since downstream industrial users are generally users in chemical industry, coal chemical industry and the like, and the requirement of a production flow, once a steam source is interrupted, the production is seriously influenced, and a safe, efficient and stable heating system and a working method thereof are sought to be a key problem of high-capacity and high-parameter heating.
Disclosure of Invention
The invention provides a double-pumping backpressure heat supply system capable of realizing high-parameter heat supply and a working method thereof aiming at the problems of stability and safety of a high-parameter and large-flow industrial steam supply heat supply system and the uncertainty problem of the high-parameter heat supply system in terms of adjustment flexibility and control strategy, effectively realizes ultrahigh-pressure parameter industrial heat supply, meets the requirements of ultrahigh-pressure and large-capacity parameter industrial steam, improves the stability and flexibility of high-efficiency heat supply of a unit generating set, fully utilizes the high efficiency of a backpressure generating set to realize backpressure operation under working conditions in winter and partial overflow operation under working conditions in summer, can realize the working conditions of shutdown and no furnace shutdown, and greatly improves the safety and stability of the heat supply system of the unit generating set.
The technical scheme adopted by the invention for solving the problems is as follows: a double-pumping back pressure heat supply system capable of realizing high-parameter heat supply is characterized by comprising a condenser, a condensate pump, a shaft seal heater, a fifth low-pressure heater, a deaerator, a water feed pump, a third high-pressure heater, a second high-pressure heater, a first high-pressure heater, a boiler, a high-pressure cylinder, a middle-pressure cylinder, a rotary partition plate and a heat network heater, wherein the condenser, the condensate pump, the shaft seal heater, the fifth low-pressure heater and the deaerator are sequentially connected, the water feed pump is connected with the deaerator, the water feed pump, the third high-pressure heater, the second high-pressure heater and the first high-pressure heater are sequentially connected, the first high-pressure heater is connected with the boiler, the boiler is respectively connected with the high-pressure cylinder and the middle-pressure cylinder, a high-pressure steam inlet regulating valve is installed at a steam inlet of the high-pressure cylinder, a middle-pressure steam inlet regulating valve is installed at a steam inlet of the middle-pressure cylinder, and the boiler is connected with a main steam pipeline and a reheating section steam pipeline, install high-pressure bypass temperature and pressure reducing valve on main steam pipe, install low pressure bypass temperature and pressure reducing valve on reheating hot section steam pipe, reheating hot section steam pipe is through branch road one and branch road two difference junction condenser and heat supply network heater, installs middling pressure steam extraction overflow valve on branch road two, the steam extraction mouth and the high pressure heater intercommunication of high pressure cylinder, the steam extraction mouth of intermediate pressure cylinder communicates with No. two high pressure heater, No. three high pressure heater, oxygen-eliminating device and No. five low pressure heater respectively, the steam extraction mouth of intermediate pressure cylinder is connected to branch road two, rotary partition has been arranged between the three-section steam extraction of intermediate pressure cylinder and the four sections steam extractions.
Furthermore, the system is provided with a full-capacity high-low pressure bypass system and a bidirectional flow medium-pressure steam exhaust overflow valve with an overflow function and a heating channel function, can serve as a heating network heater of a primary low-pressure heater, has and meets the requirement of a wide-range heat load regulation function, and realizes the special working condition operation of non-heating working condition operation, partial steam extraction heating operation, double-extraction and backpressure heating working condition operation and external heating without stopping the boiler.
Further, the system still includes that the middling pressure supplies vapour liquid accuse governing valve, a low pressure supplies vapour liquid accuse governing valve and No. two low pressures to supply vapour liquid accuse governing valves, the middling pressure supplies vapour liquid accuse governing valve to connect on reheating hot section steam conduit, a low pressure supplies vapour liquid accuse governing valve to connect on the three-section steam extraction pipeline of intermediate pressure jar, No. two low pressures supply vapour liquid accuse governing valve to connect on the branch pipe of reheating hot section steam conduit behind the low pressure bypass temperature reduction pressure valve.
The working method comprises the following steps:
under the working condition of no heat supply, condensed water enters a boiler through a condenser, a condensed water pump, a shaft seal heater, a fifth low-pressure heater, a deaerator, a water feed pump, a third high-pressure heater, a second high-pressure heater and a first high-pressure heater, superheated steam enters a high-pressure cylinder for acting through a high-pressure steam inlet regulating valve, reheated steam enters an intermediate pressure cylinder for acting through an intermediate-pressure steam inlet regulating valve, a rotary partition board keeps a fully-open state, exhaust steam of the intermediate pressure cylinder enters a heat supply network heater to serve as a primary regenerative heater, drain water flows back to the condenser, the exhaust steam of the intermediate pressure cylinder enters the condenser through an intermediate-pressure steam exhaust overflow valve when the back pressure is too high, and the steam turbine unit can realize the operation under the working condition of no heat supply.
Under the working condition of heat supply steam extraction, the unit realizes two-stage regulation steam extraction and heating operation, medium-pressure steam extraction is from the steam pressure of a reheating hot section, low-pressure steam extraction is from three-section steam extraction, and the exhaust steam of the medium-pressure cylinder is used by heating hot users; the steam supply of the intermediate pressure cylinder is controlled by a high-pressure steam inlet regulating valve and is assisted to be regulated by an intermediate pressure steam supply hydraulic control regulating valve; the low-pressure steam supply is controlled by a medium-pressure steam inlet regulating valve and is assisted to be regulated by a first low-pressure steam supply hydraulic control regulating valve; heating users are controlled by the rotary partition plate, and are assisted to be controlled by a medium-pressure steam exhaust overflow valve.
Under the working condition of stopping the boiler and not stopping the boiler, the unit can still realize uninterrupted external heat supply, heat supply is carried out by adopting a high-low bypass, superheated steam enters reheat steam after being subjected to temperature reduction and pressure reduction by a high-pressure bypass temperature-reducing pressure-reducing valve, and medium-pressure steam is still supplied by the reheat steam of a hot section; the low-pressure steam is supplied after being subjected to temperature and pressure reduction by a low-pressure bypass temperature and pressure reducing valve, and the steam for heating enters the heating network heater through a medium-pressure steam exhaust overflow valve; the medium-pressure steam supply is regulated by a high-pressure steam inlet regulating valve and assisted by a medium-pressure steam supply hydraulic control regulating valve; the low-pressure steam is regulated by a medium-pressure steam inlet regulating valve and is assisted by a second low-pressure steam supply hydraulic control regulating valve, under the working condition, the steam for heating is subjected to temperature and pressure reduction by a low-pressure bypass temperature and pressure reducing valve and then reversely flows to a heat supply network heater, and the steam amount used by the heating load is regulated by a medium-pressure steam exhaust overflow valve.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention realizes ultrahigh pressure parameter heat supply, low pressure parameter steam heat supply and back pressure heat supply, realizes comprehensive utilization of heat energy, and greatly improves the thermoelectric ratio of the unit.
2. The invention realizes the feedforward control of three-level heat supply, and simultaneously configures the steam extraction regulating valve to accurately control steam parameters, thereby greatly improving the stability of heat supply parameters.
3. The invention realizes the operation under various working conditions such as no heat supply working condition, partial heat supply working condition, shutdown working condition and non-furnace-shutdown working condition, and greatly ensures the stability of industrial steam supply.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
In the figure: the system comprises a condenser 1, a condensate pump 2, a shaft seal heater 3, a fifth low-pressure heater 4, a deaerator 5, a water supply pump 6, a third high-pressure heater 7, a second high-pressure heater 8, a first high-pressure heater 9, a boiler 10, a high-pressure steam inlet regulating valve 11, a high-pressure cylinder 12, a medium-pressure steam inlet regulating valve 13, a medium-pressure cylinder 14, a rotary partition plate 15, a heat supply network heater 16, a high-pressure bypass temperature and pressure reducing valve 17, a low-pressure bypass temperature and pressure reducing valve 18, a medium-pressure steam supply hydraulic control regulating valve 19, a first low-pressure steam supply hydraulic control regulating valve 20, a medium-pressure steam discharge overflow valve 21 and a second low-pressure steam supply hydraulic control regulating valve 22.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in this embodiment, a double-pumping back pressure heating system capable of realizing high-parameter heating includes a condenser 1, a condensate pump 2, a gland seal heater 3, a fifth low-pressure heater 4, a deaerator 5, a water feed pump 6, a third high-pressure heater 7, a second high-pressure heater 8, a first high-pressure heater 9, a boiler 10, a high-pressure cylinder 12, a middle pressure cylinder 14, a rotary partition 15 and a heat network heater 16, the condenser 1, the condensate pump 2, the gland seal heater 3, the fifth low-pressure heater 4 and the deaerator 5 are sequentially connected, the water feed pump 6 is connected with the deaerator 5, the water feed pump 6, the third high-pressure heater 7, the second high-pressure heater 8 and the first high-pressure heater 9 are sequentially connected, the first high-pressure heater 9 is connected with the boiler 10 is respectively connected with the high-pressure cylinder 12 and the middle pressure cylinder 14, a high-pressure steam inlet of the high-pressure cylinder 12 is provided with a high-pressure steam inlet regulating valve 11, the steam inlet of the intermediate pressure cylinder 14 is provided with an intermediate pressure steam inlet regulating valve 13, the boiler 10 is connected with a main steam pipeline and a reheating thermal section steam pipeline, the main steam pipeline is provided with a high-pressure bypass temperature and pressure reducing valve 17, the reheating thermal section steam pipeline is provided with a low-pressure bypass temperature and pressure reducing valve 18, the reheating thermal section steam pipeline is respectively connected with a condenser 1 and a heat network heater 16 through a first branch and a second branch, the second branch is provided with an intermediate pressure steam exhaust overflow valve 21, the steam outlet of the high pressure cylinder 12 is communicated with the first high pressure heater 9, the steam outlet of the intermediate pressure cylinder 14 is respectively communicated with the second high pressure heater 8, the third high pressure heater 7, the deaerator 5 and the fifth low pressure heater 4, the steam outlet of the intermediate pressure cylinder 14 is connected with the second branch, and a rotary partition plate 15 is arranged between the three-stage steam exhaust and the four-stage steam exhaust of the intermediate pressure cylinder 14.
In this embodiment, the system further includes a medium-pressure steam-liquid control regulating valve 19, a first low-pressure steam-liquid control regulating valve 20, and a second low-pressure steam-liquid control regulating valve 22, where the medium-pressure steam-liquid control regulating valve 19 is connected to the reheating heat section steam pipeline, the first low-pressure steam-liquid control regulating valve 20 is connected to the three-section steam extraction pipeline of the medium pressure cylinder 14, and the second low-pressure steam-liquid control regulating valve 22 is connected to the branch pipe of the reheating heat section steam pipeline behind the low-pressure bypass temperature and pressure reducing valve 18.
The working method comprises the following steps:
under the working condition of no heat supply, condensed water enters a boiler 10 from a condenser 1, a condensed water pump 2, a shaft seal heater 3, a fifth low-pressure heater 4, a deaerator 5, a water feed pump 6, a third high-pressure heater 7, a second high-pressure heater 8 and a first high-pressure heater 9, superheated steam enters a high-pressure cylinder 12 through a high-pressure steam inlet regulating valve 11 to do work, reheated steam enters an intermediate-pressure cylinder 14 through an intermediate-pressure steam inlet regulating valve 13 to do work, a rotary partition plate 15 keeps a fully open state, exhaust steam of the intermediate-pressure cylinder 14 enters a heat supply network heater 16 to serve as a primary heat return heater, drained water flows back to the condenser 1, when back pressure is too high, the drained water enters the condenser 1 through an intermediate-pressure steam exhaust overflow valve 21, and the steam turbine unit can realize the operation of no heat supply under the working condition.
Under the working condition of heat supply steam extraction, the unit realizes two-stage regulation steam extraction and heating operation, medium-pressure steam extraction is from the steam pressure of a reheating hot section, low-pressure steam extraction is from three-section steam extraction, and the exhaust steam of the medium pressure cylinder 14 is used by a heating hot user; the steam supply of the intermediate pressure cylinder 14 is controlled by a high pressure steam inlet regulating valve 11 and is assisted by an intermediate pressure steam supply control valve 19; the low-pressure steam supply is controlled by a medium-pressure steam inlet regulating valve 13 and is assisted to be regulated by a first low-pressure steam supply hydraulic control regulating valve 20; the heating user is controlled by the rotary clapboard 15 and is assisted by the medium-pressure steam exhaust overflow valve 21.
The exhaust steam of the intermediate pressure cylinder 14 is used as a heating source of the heat supply network heater 16, the heat supply network heater 16 is used as bypass condensed water at the moment, the bypass condensed water is switched to the outer pipe network for supplying hot water, the heat is controlled by the rotary partition plate 15 after three-stage steam extraction, the intermediate pressure exhaust steam overflow valve 21 is used for assisting control, and the unit backpressure is reduced by closing the rotary partition plate 15 preferentially to keep the unit economy.
Under the working condition of stopping the machine and not stopping the furnace, the unit can still realize uninterrupted external heat supply, heat supply is carried out by adopting a high-low bypass, superheated steam enters reheat steam after being subjected to temperature and pressure reduction by a high-pressure bypass temperature and pressure reducing valve 17, and medium-pressure steam is still supplied by the reheat steam of a hot section; the low-pressure steam is supplied after being subjected to temperature and pressure reduction by a low-pressure bypass temperature and pressure reducing valve 18, and the steam for heating enters a heating network heater 16 through a medium-pressure steam exhaust overflow valve 21; medium-pressure steam supply is regulated by a high-pressure steam inlet regulating valve 11 and is assisted by a medium-pressure steam supply hydraulic control regulating valve 19; the low-pressure steam is adjusted by the medium-pressure steam inlet adjusting valve 13 and assisted by the second low-pressure steam supply hydraulic control adjusting valve 22, under the working condition, the steam for heating is subjected to temperature and pressure reduction by the low-pressure bypass temperature and pressure reducing valve 18 and then reversely flows to the heat supply network heater 16, and the steam amount used by the heating load is adjusted by the medium-pressure steam discharge overflow valve 21.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (3)

1. A double-pumping back pressure heat supply system capable of realizing high-parameter heat supply is characterized by comprising a condenser (1), a condensate pump (2), a shaft seal heater (3), a fifth low-pressure heater (4), a deaerator (5), a water feed pump (6), a third high-pressure heater (7), a second high-pressure heater (8), a first high-pressure heater (9), a boiler (10), a high-pressure cylinder (12), a middle-pressure cylinder (14), a rotary partition plate (15) and a heat supply network heater (16), wherein the condenser (1), the condensate pump (2), the shaft seal heater (3), the fifth low-pressure heater (4) and the deaerator (5) are sequentially connected, the water feed pump (6) is connected with the deaerator (5), the water feed pump (6), the third high-pressure heater (7), the second high-pressure heater (8) and the first high-pressure heater (9) are sequentially connected, the first high-pressure heater (9) is connected with a boiler (10), the boiler (10) is respectively connected with a high-pressure cylinder (12) and a medium-pressure cylinder (14), a high-pressure steam inlet regulating valve (11) is installed at a steam inlet of the high-pressure cylinder (12), a medium-pressure steam inlet regulating valve (13) is installed at a steam inlet of the medium-pressure cylinder (14), the boiler (10) is connected with a main steam pipeline and a reheating thermal section steam pipeline, a high-pressure bypass temperature and pressure reducing valve (17) is installed on the main steam pipeline, a low-pressure bypass temperature and pressure reducing valve (18) is installed on the reheating thermal section steam pipeline, the reheating thermal section steam pipeline is respectively connected with a condenser (1) and a heat network heater (16) through a first branch and a second branch, a medium-pressure steam exhaust overflow valve (21) is installed on the second branch, and a steam exhaust port of the high-pressure cylinder (12) is communicated with the first high-pressure heater (9), the steam extraction port of intermediate pressure jar (14) communicates with No. two high pressure feed water heater (8), No. three high pressure feed water heater (7), oxygen-eliminating device (5) and No. five low pressure feed water heater (4) respectively, the steam extraction port of intermediate pressure jar (14) is connected to branch two, rotatory baffle (15) have been arranged between the three-section extraction steam of intermediate pressure jar (14) and the four-section extraction steam.
2. The double-pumping back pressure heating system capable of realizing high-parameter heating according to claim 1, further comprising a medium-pressure steam-supply control valve (19), a first low-pressure steam-supply control valve (20) and a second low-pressure steam-supply control valve (22), wherein the medium-pressure steam-supply control valve (19) is connected to a reheating section steam pipeline, the first low-pressure steam-supply control valve (20) is connected to a three-section steam extraction pipeline of a medium pressure cylinder (14), and the second low-pressure steam-supply control valve (22) is connected to a branch pipe of the reheating section steam pipeline behind the low-pressure bypass temperature and pressure reducing valve (18).
3. A method of operating a double pumping backpressure heating system capable of high parameter heating as claimed in claim 1 or 2, wherein the method comprises the following steps:
under the working condition of no heat supply, condensed water enters a boiler (10) through a condenser (1), a condensed water pump (2), a shaft seal heater (3), a fifth low-pressure heater (4), a deaerator (5), a water feed pump (6), a third high-pressure heater (7), a second high-pressure heater (8) and a first high-pressure heater (9), superheated steam enters a high-pressure cylinder (12) through a high-pressure steam inlet regulating valve (11) to do work, reheated steam enters an intermediate-pressure cylinder (14) through an intermediate-pressure steam inlet regulating valve (13) to do work, a rotary partition plate (15) is kept in a fully open state, exhaust steam of the intermediate-pressure cylinder (14) enters a heat supply network heater (16) to serve as a primary regenerative heater, drain water flows back to the condenser (1), and exhaust steam of the intermediate-pressure cylinder (14) enters the condenser (1) through an intermediate-pressure steam exhaust overflow valve (21) when the backpressure is too high, so that the unit can realize the working condition of no heat supply;
under the working condition of heat supply steam extraction, the unit realizes two-stage regulation steam extraction and heating operation, medium-pressure steam extraction is from the steam pressure of a reheating hot section, low-pressure steam extraction is from three-section steam extraction, and the exhaust steam of the medium pressure cylinder (14) is used by a heating hot user; the steam supply of the intermediate pressure cylinder (14) is controlled by a high-pressure steam inlet regulating valve (11) and is assisted to be regulated by an intermediate pressure steam supply control valve (19); the low-pressure steam supply is controlled by a medium-pressure steam inlet regulating valve (13) and is assisted to be regulated by a first low-pressure steam supply hydraulic control regulating valve (20); the heating user is controlled by a rotary clapboard (15) and is assisted by a medium-pressure steam exhaust overflow valve (21);
under the working condition of stopping the boiler without stopping the boiler, the unit can realize uninterrupted external heat supply, heat supply is carried out by adopting a high-low bypass, superheated steam enters reheat steam after being subjected to temperature and pressure reduction by a high-pressure bypass temperature and pressure reducing valve (17), and medium-pressure steam is still supplied by the reheat steam of a reheat section; the low-pressure steam is supplied after being subjected to temperature and pressure reduction by a low-pressure bypass temperature and pressure reducing valve (18), and the steam for heating enters a heat supply network heater (16) through a medium-pressure steam exhaust overflow valve (21); medium-pressure steam supply is regulated by a high-pressure steam inlet regulating valve (11) and is assisted by a medium-pressure steam supply control regulating valve (19); the low-pressure steam is adjusted by a medium-pressure steam inlet adjusting valve (13) and assisted by a second low-pressure steam supply control adjusting valve (22), under the working condition, the steam for heating reversely flows to a heat supply network heater (16) after being subjected to temperature and pressure reduction by a low-pressure bypass temperature and pressure reducing valve (18), and the steam amount used by the heating load is adjusted by a medium-pressure steam discharge overflow valve (21).
CN202210397215.6A 2022-04-15 2022-04-15 Double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and working method thereof Pending CN114877307A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114658497A (en) * 2022-03-01 2022-06-24 华电电力科学研究院有限公司 Switching front-end control system and control method for steam extraction system of double-extraction back steam turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114658497A (en) * 2022-03-01 2022-06-24 华电电力科学研究院有限公司 Switching front-end control system and control method for steam extraction system of double-extraction back steam turbine
CN114658497B (en) * 2022-03-01 2023-08-29 华电电力科学研究院有限公司 Switching front-end control method for steam extraction system of double-extraction back steam turbine

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