CN109113818A - A kind of enhancing power plant flexibility therrmodynamic system - Google Patents

A kind of enhancing power plant flexibility therrmodynamic system Download PDF

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Publication number
CN109113818A
CN109113818A CN201710496218.4A CN201710496218A CN109113818A CN 109113818 A CN109113818 A CN 109113818A CN 201710496218 A CN201710496218 A CN 201710496218A CN 109113818 A CN109113818 A CN 109113818A
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CN
China
Prior art keywords
cylinder
high pressure
connects
pressure
reheater
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710496218.4A
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Chinese (zh)
Inventor
刘利
袁雄俊
朱大宏
白杰
赵志刚
聂恒宽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China Power Engineering Co Ltd of China Power Engineering Consulting Group
North China Power Engineering Beijing Co Ltd
Original Assignee
North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China Power Engineering Co Ltd of China Power Engineering Consulting Group filed Critical North China Power Engineering Co Ltd of China Power Engineering Consulting Group
Priority to CN201710496218.4A priority Critical patent/CN109113818A/en
Publication of CN109113818A publication Critical patent/CN109113818A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K19/00Regenerating or otherwise treating steam exhausted from steam engine plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00General layout or general methods of operation of complete plants
    • F01K13/02Controlling, e.g. stopping or starting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01KSTEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic

Abstract

A kind of enhancing power plant of the invention flexibility therrmodynamic system, boiler superheater connect high pressure cylinder, and boiler reheater connects intermediate pressure cylinder, intermediate pressure cylinder connects low pressure (LP) cylinder, and low pressure (LP) cylinder connects generator, it is characterised in that, high pressure cylinder entrance is provided with high pressure main stop valve, presses stop valve in the setting of intermediate pressure cylinder entrance;High pressure turbine by is provided between superheater and high pressure cylinder, high pressure turbine by connects reheater;High pressure cylinder connects leading point by high check-valves of arranging, and leading point connects high pressure turbine by and reheater by motor-operated isolation valve;Leading point connects temperature-decreased pressure reducer, and temperature-decreased pressure reducer is connected to outer for steam;Connect low voltage bypass between reheater and intermediate pressure cylinder, low voltage bypass is connected to condenser and outer for steam.The present invention is used to enhance the flexibility of power plant, meets power peak regulation needs.

Description

A kind of enhancing power plant flexibility therrmodynamic system
Technical field
The present invention relates to power plant field, especially a kind of enhancing power plant flexibility therrmodynamic system.
Background technique
Especially in three northern areas of China, power supply ability has exceeded use demand, the energy waste of electric energy production for the country at present Seriously, China's wind-powered electricity generation, photovoltaic installed capacity have become global maximum, but abandonment, abandoning optical issue exist always.It is asked to solve this Topic, national requirements coal unit implements flexibility transformation at present, increases peak modulation capacity.
But three northern areas of China major part coal unit is all thermal power plant unit, and the adjusting of thermal power plant unit is with heat in traditional sense Fixed electricity.The demand of external heat supply is just able to satisfy in the case where guaranteeing certain generation load.It is with an overcritical thermal power plant unit of 350MW Example, when to meet specified steam extraction 550t/h, generated output reaches about 80% i.e. 280MW at this time.This obvious electric load is excessively high, It is unable to satisfy the requirement that power grid increases peak modulation capacity, this, which just needs to realize using new technical measures, guarantees that heat supply is reduced again Generated output realizes thermoelectricity decoupling.
Current alternative realization thermoelectricity decoupling technology scheme has much, such as high back pressure thermal power plant unit, that is, the row of raising Vapour back pressure removes cooling low pressure (LP) cylinder steam discharge using heat supply network recirculated water as cooling medium, recycles exhaust steam residual heat, improve externally for thermal energy Power, or do not improve heat capacity and reduce host into vapour and then reduce generated output.It can also be using low pressure (LP) cylinder not air inlet Optical axis scheme or scheme with 3S clutch.Above technical scheme all unfavorable factors are exactly the progress needed to host Change, difficulty are bigger.In addition, also having such as large-scale heat-storage technology and heat recovery technology etc., but these technical measures units Cost is higher, relatively good when for expanding heat capacity, such as increasing peak modulation capacity, realizes thermoelectricity decoupling, then has adjusting model It encloses compared with minor defect.
Summary of the invention
Technical problem solved by the invention is to design a kind of enhancing power plant flexibility therrmodynamic system, for enhancing power plant Flexibility, meet power peak regulation needs.
To achieve the above object, the present invention adopts the following technical scheme: a kind of enhancing power plant flexibility therrmodynamic system, boiler Superheater connects high pressure cylinder, and boiler reheater connects intermediate pressure cylinder, and intermediate pressure cylinder connects low pressure (LP) cylinder, and low pressure (LP) cylinder connects generator, special Sign is that high pressure cylinder entrance is provided with high pressure main stop valve, presses stop valve in the setting of intermediate pressure cylinder entrance;Superheater and high pressure cylinder Between be provided with high pressure turbine by, high pressure turbine by connects reheater;High pressure cylinder connects leading point by high check-valves of arranging, and leading point is logical Cross motor-operated isolation valve connection high pressure turbine by and reheater;Leading point connects temperature-decreased pressure reducer, and temperature-decreased pressure reducer is connected to outer for steaming Vapour;Connect low voltage bypass between reheater and intermediate pressure cylinder, low voltage bypass is connected to condenser and outer for steam.
Beneficial effects of the present invention are as follows: the aperture by controlling high pressure main stop valve reduces the main steaming into high pressure cylinder to the greatest extent Vapour amount, to reduce generated output, other main steams then pass through the laggard reheater of high pressure turbine by pressure and temperature reducing and continue to heat, few Measure into high pressure cylinder do work main steam from high pressure cylinder be discharged, since exhaust steam pressure is relatively low at this time, can not with after high pressure turbine by Pressure matches, thus by directly outer for steam again after setting temperature-decreased pressure reducer adjustment parameter.In addition, again by being pressed in control The aperture of stop valve, under the premise of meeting steam turbine shafting stable and low pressure (LP) cylinder minimum cooling flow, make as far as possible intermediate pressure cylinder lack into Vapour, remaining reheated steam then pass through after low voltage bypass pressure and temperature reducing outward for steam or heating steam extraction.
Power plant's flexibility can be enhanced by the system, expand the range of power peak regulation, in the premise for meeting heating demand Under keep generation load low as far as possible.By taking 350MW unit as an example, the present invention electric load can be made to reach 30% i.e. 100MW hereinafter, It is outer simultaneously still to can reach 550t/h for heating steam supply.
Detailed description of the invention
Fig. 1 is system construction drawing of the embodiment of the present invention.
Specific embodiment
As shown in Figure 1, a kind of enhancing power plant of the invention flexibility therrmodynamic system, 1 boiler superheater 2 connect high pressure cylinder 3, pot 1 reheater 4 of furnace connects intermediate pressure cylinder 5, and intermediate pressure cylinder 5 connects low pressure (LP) cylinder 6, and low pressure (LP) cylinder 6 connects generator 7, focuses on, high pressure cylinder 3 entrances are provided with high pressure main stop valve 31, press stop valve 51 in the setting of 5 entrance of intermediate pressure cylinder;Between superheater 2 and high pressure cylinder 3 It is provided with high pressure turbine by 8, high pressure turbine by 8 connects reheater 4;High pressure cylinder 3 connects leading point 10 by high check-valves 11 of arranging, and draws Point 10 connects high pressure turbine by 8 and reheater 4 by motor-operated isolation valve 14;Leading point 10 connects temperature-decreased pressure reducer 13, pressure and temperature reducing Device 13 is connected to outer for steam;Low voltage bypass 15 is connected between reheater 4 and intermediate pressure cylinder 5, low voltage bypass 15 is connected to condenser And it is outer for steam.
By controlling the aperture of high pressure main stop valve, the main steam amount into high pressure cylinder is reduced to the greatest extent, other main steams are then led to It crosses the laggard reheater of high pressure turbine by pressure and temperature reducing to continue to heat, be discharged on a small quantity into the main steam that high pressure cylinder does work from high pressure cylinder, but Since exhaust steam pressure is relatively low at this time, it can not match with the pressure after high pressure turbine by, by the way that level-one temperature-decreased pressure reducer tune is arranged It is directly outer for steam again after section parameter, while one of motor-operated isolation valve need to be added after the leading point after high row's check-valves.In This by pressing the aperture of stop valve in control, is meeting the stable premise with low pressure (LP) cylinder minimum cooling flow of steam turbine shafting simultaneously Under, lack intermediate pressure cylinder into vapour, remaining reheated steam passes through outer for steam or heating steam extraction after low voltage bypass pressure and temperature reducing.
Associated pipe and valve can be arranged according to demand in this case, this be skilled addressee will appreciate that, This is repeated no more.

Claims (1)

1. a kind of enhancing power plant flexibility therrmodynamic system, boiler superheater connects high pressure cylinder, and boiler reheater connects intermediate pressure cylinder, in Cylinder pressure connects low pressure (LP) cylinder, and low pressure (LP) cylinder connects generator, which is characterized in that high pressure cylinder entrance is provided with high pressure main stop valve, middle pressure Stop valve is pressed in the setting of cylinder entrance;High pressure turbine by is provided between superheater and high pressure cylinder, high pressure turbine by connects reheater;It is high Cylinder pressure connects leading point by high check-valves of arranging, and leading point connects high pressure turbine by and reheater by motor-operated isolation valve;Leading point Temperature-decreased pressure reducer is connected, temperature-decreased pressure reducer is connected to outer for steam;Low voltage bypass is connected between reheater and intermediate pressure cylinder, by low pressure Road is connected to condenser and outer for steam.
CN201710496218.4A 2017-06-26 2017-06-26 A kind of enhancing power plant flexibility therrmodynamic system Pending CN109113818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710496218.4A CN109113818A (en) 2017-06-26 2017-06-26 A kind of enhancing power plant flexibility therrmodynamic system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710496218.4A CN109113818A (en) 2017-06-26 2017-06-26 A kind of enhancing power plant flexibility therrmodynamic system

Publications (1)

Publication Number Publication Date
CN109113818A true CN109113818A (en) 2019-01-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710496218.4A Pending CN109113818A (en) 2017-06-26 2017-06-26 A kind of enhancing power plant flexibility therrmodynamic system

Country Status (1)

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CN (1) CN109113818A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111706898A (en) * 2020-05-15 2020-09-25 华电电力科学研究院有限公司 Method for improving heat supply capacity of unit after high-back-pressure heat supply transformation
CN111734505A (en) * 2020-05-27 2020-10-02 北京龙威发电技术有限公司 Supercritical high-back-pressure steam turbine heat supply system and heat supply method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111706898A (en) * 2020-05-15 2020-09-25 华电电力科学研究院有限公司 Method for improving heat supply capacity of unit after high-back-pressure heat supply transformation
CN111706898B (en) * 2020-05-15 2021-12-24 华电电力科学研究院有限公司 Method for improving heat supply capacity of unit after high-back-pressure heat supply transformation
CN111734505A (en) * 2020-05-27 2020-10-02 北京龙威发电技术有限公司 Supercritical high-back-pressure steam turbine heat supply system and heat supply method

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