CN102345895B - Steam-water heating system for thermal power plant - Google Patents

Steam-water heating system for thermal power plant Download PDF

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Publication number
CN102345895B
CN102345895B CN 201110203667 CN201110203667A CN102345895B CN 102345895 B CN102345895 B CN 102345895B CN 201110203667 CN201110203667 CN 201110203667 CN 201110203667 A CN201110203667 A CN 201110203667A CN 102345895 B CN102345895 B CN 102345895B
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water
heat pump
absorption heat
power plant
steam
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CN102345895A (en
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高妹芬
江荣方
毛洪财
蔡小荣
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Shuangliang Eco Energy Systems Co Ltd
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Shuangliang Eco Energy Systems Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Abstract

The invention relates to a steam-water heating system for a thermal power plant, which comprises an extraction condensing turbine (1), a first water-cooled condenser (5), a steam-water heat exchanger (9) and absorption heat pumps (XR1...n). The absorption heat pumps (XR1...n) are additionally provided with subcoolers (7). The system is additionally provided with a second water-cooled condenser (6). Return water of a heat supply network of the thermal power plant is divided into two paths after entering the thermal power plant, wherein one path of the return water of the heat supply network firstly enters an absorber of a first absorption heat pump (XR1), then enters an absorber of a second absorption heat pump (XR2), is sequentially connected with the absorbers of the absorption heat pumps (XR1...n) until entering an absorber of a nth absorption heat pump (XRn), flows out of the absorber of the nth absorption heat pump (XRn) and then enters a condenser of the nth absorption heat pump; the other path of the return water of the heat supply network enters the condensers (7) of all the absorption heat pumps in parallel; and the two paths of the return water of the heat supply network are finally merged to be directly sent out or be heated and then sent out. Due to the adoption of the steam-water heating system, more condensing waste heat of the thermal power plant can be recovered, the operating efficiencies of the heat pumps are improved and a heating network system operates more reliably.

Description

Steam-water heating system for thermal power plant
Technical field
The present invention relates to a kind of thermoelectric combined heating system, be applicable to the exhaust steam of cogeneration power plant steam turbine more energy-conservation, utilize safely and reliably, heat network system more utilizes condensation waste heat.
Background technology
Along with the shortage of the energy and the requirement of energy-saving and emission-reduction improve day by day, the comprehensive utilization technique of the energy is in continuous lifting.North City planning cogeneration carries out central heating, to substitute original independent boiler central heating, realizes the requirement of energy-saving and emission-reduction.Take full advantage of steam power plant's used heat, to improve the heat capacity of steam power plant, realize better energy-saving and emission-reduction, guarantee again the safe and reliable operation of steam power plant and heat supply network simultaneously, various new flow processs require study.Realize the more turbine discharge used heat that reclaims in power plant, the most important condition is with the secondary network return water temperature reduction of hot user side, adopts on this basis the source pump take electricity as power, or the absorption type heat pump assembly take the heat supply network high-temperature water as power.Carry out refrigeration cool-down by the heat supply network backwater that power plant is confessed, as the waste heat source of heat pump again for secondary network, the heat supply network return water temperature is reduced after telegram in reply factory.Power plant's heat supply network backwater is introduced into former plant condenser after entering power plant, with electric power plant circulating water be blended in condenser heat up after, then enter absorption heat pump, send after heating up in heat pump.In this system, the temperature that recirculated water goes out heat pump be heat supply network in the key of the many recovering condensing heats of whole Heating Season, in same outlet temperature, can reclaim more condensation waste heat, and become the another difficult problem of steam power plant's central heating technology with high-grade drawing gas less.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of condensation waste heat of realizing reclaiming more steam power plants is provided, the operational efficiency of raising heat pump and heat network system be the steam-water heating system for thermal power plant of reliability service more.
The object of the present invention is achieved like this: a kind of steam-water heating system for thermal power plant, comprise sucking condensing turbine, extracted steam from turbine pipe, the first water-cooled condenser, vapor-water heat exchanger and absorption heat pump, described absorption heat pump has the n platform, n is 〉=2 natural number, and high steam is extracted part steam out as the thermal source of absorption heat pump and vapor-water heat exchanger after sucking condensing turbine work done generating.Exhaust steam in steam turbine condenses into water by condenser, and condensation waste heat is recycled.described absorption heat pump has additional subcooler, the increase of described system has second water-cooled condenser, steam power plant's heat supply network backwater is divided into the absorber that two tunnel: one road heat supply network backwater is introduced into the First absorption heat pump after entering power plant, enter again the absorber of second absorption heat pump ... be connected in series successively, until enter the absorber of n platform absorption heat pump, the absorber that goes out n platform absorption heat pump enters the condenser of this n platform absorption heat pump again, then from n-1, n-2 ... be connected in series successively, condenser from the First absorption heat pump flows out at last, another road heat supply network backwater parallel connection enters the subcooler of each absorption heat pump, and two road heat supply network backwater merge at last, directly or again send after vapor-water heat exchanger, the evaporimeter recirculated water of the second water-cooled condenser goes out the evaporimeter that is introduced into n platform absorption heat pump after described the second water-cooled condenser, then return successively, enter at last the evaporimeter of second absorption heat pump, First absorption heat pump, return to the second condenser after the evaporimeter outflow of First absorption heat pump, the cool cycles water discharge pipe of the first water-cooled condenser is connected cooling system and is connected with steam power plant.
Steam-water heating system for thermal power plant of the present invention, the cooling system of described steam power plant are cooling tower, air cooling device or a device for cooling.The cooling system of steam power plant can be that air and this first water-cooled condenser go out water direct heat-exchange, can be also that air and the first water-cooled condenser water outlet indirect heat exchange enter atmosphere with heat.
Steam-water heating system for thermal power plant of the present invention, the subcooler of described each absorption heat pump is merged into a subcooler, subcooler after this merging of the water as refrigerant pipeline of each absorption heat pump access in parallel, subcooler and another road heat supply network backwater that the heat supply network backwater goes out after this merging merge at last.
This steam-water heating system for thermal power plant also is applicable to air cooling power plant and a cold power plant.
The invention has the beneficial effects as follows:
Absorption heat pump in steam power plant has increased when subcooler and water-cooled condenser are done heat supply for heat supply in winter season and has moved.Heat supply network recirculated water and power plant's cooling circulating water are separated isolated operation.Guaranteed the water quality of hot net water, guaranteed that all kinds of heat transmission equipments can safe and reliable energy-efficient operation.And due to cooling circulating water and condensing direct heat transfer, compare with employing cellular-type heat-exchange system and can reclaim used heat more.Adopt heat supply network recirculated water directly to reclaim the COP value that the heat pump waste heat has more effectively improved heat pump.The working steam of heat pump will be saved more than 8% than original system.Because heat pump has been used high-grade energy less in reclaiming steam power plant's condensation waste heat process, so compare with former heat pump, in the situation that reclaim same condensation waste heat, the temperature that goes out heat pump is lower than originally, can guarantee that so more heat supply network recovering condensing heat amount when heating demand descends realizes maximizing, and is used for heating at the more exhaust steam in steam turbine of whole Heating Season utilization.On the other hand, owing to reclaiming same condensation heat, the circulating water temperature that goes out heat pump is low, in same outlet temperature situation, and the recyclable more condensation waste heat of heat pump.By heat supply network recirculated water and cooling circulating water corresponding series flow in the absorber of each heat pump and condenser and evaporimeter, the performance of heat pump is better optimized.The volume of heat pump, weight indicator can descend greatly, and manufacturing cost can descend simultaneously.On the other hand, due to the performance optimization of heat pump, every economic technology economic indicator of steam power plant is further enhanced.
Description of drawings
Fig. 1 is the schematic diagram that the heat supply network backwater is directly shunted and evaporator with heat pump recirculated water circulates through the second water-cooled condenser that the present invention relates to.
Reference numeral in figure:
Sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, solidifying water pipe 4, the first water-cooled condenser 5(are former), the second water-cooled condenser 6(is newly-increased), subcooler 7, cool cycles water discharge pipe 8, vapor-water heat exchanger 9, heat supply network return branch 10, heat supply network return branch 11, cooling tower 12, air cooling device 13, a device for cooling 14, evaporimeter circulating water pipe 15, absorption heat pump XR1 ... n.
Heat supply network backwater A, heat supply network water supply A2, high steam B, exhaust steam in steam turbine C, solidifying water go out D.The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1, Fig. 1 is the schematic diagram that the heat supply network backwater is directly shunted and evaporator with heat pump recirculated water circulates through the second water-cooled condenser that the present invention relates to.As seen from Figure 1, heating system is former by sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, solidifying water pipe 4, the first water-cooled condenser 5(), the second water-cooled condenser 6(is newly-increased), subcooler 7, cool cycles water discharge pipe 8, vapor-water heat exchanger 9, heat supply network return branch 10, heat supply network return branch 11, cooling tower 12, air cooling device 13, a device for cooling 14, evaporimeter circulating water pipe 15, absorption heat pump XR1 ... the compositions such as n and water pump, valve and connecting line.Described absorption heat pump XR1 ... n has the n platform, and n is 〉=2 natural number.The heat supply network backwater is divided into two the tunnel after entering power plant: heat supply network return branch 10 and heat supply network return branch 11.One road heat supply network return branch 10 enters the absorber of First absorption heat pump XR1, go out the absorber that enters second absorption heat pump XR2 after the absorber of First absorption heat pump XR1, all the other the like, go out the absorber that enters again n platform absorption heat pump XRn after the absorber of n-1 platform absorption heat pump XR2, enter again the condenser of n platform absorption heat pump XRn, then enter the condenser of n-1 platform absorption heat pump XR2, all the other the like,, go out finally by the condenser of First absorption heat pump XR1.Just enter the condenser of absorption heat pump XR2 after the minimum absorber from absorption heat pump XR2 of this one road hot net water goes out, go out the condenser that returns to absorption heat pump XR1 after the condenser of absorption heat pump XR2, the condenser from absorption heat pump XR1 goes out at last.This road heat supply network backwater through First absorption heat pump XR1, second absorption heat pump XR2 ... the absorber of n platform absorption heat pump XRn add gentle n platform absorption heat pump XRn ... the condenser of second absorption heat pump XR2, First absorption heat pump XR1 is heated, and the heat supply network return water temperature is raise.The direct parallel connection of another road heat supply network return branch 11 enters each absorption heat pump XR1 ... the subcooler 7 of n.Heat up in the interior heat exchange of subcooler 7, taken away the heat of absorption heat pump condensation water as refrigerant, the heat of the water as refrigerant that the heat pump generator produces has obtained effective utilization.Two road heat supply network backwater merge at last, directly or again send after vapor-water heat exchanger 9 heats up.Owing to entering evaporimeter after the water as refrigerant cooling, substantially eliminated the liquid state loss that water as refrigerant enters after evaporimeter self flash distillation cooling, make water as refrigerant the COP value of heat pump is improved all for the refrigeration to cooling circulating water, reached two effects that get at one stroke.The evaporimeter recirculated water of the second water-cooled condenser 6 of steam power plant after heating as the low-temperature heat source of heat pump, the evaporimeter circulating water pipe 15 that goes out described the second water-cooled condenser 6 is introduced into the evaporimeter of n platform absorption heat pump XRn, then return successively, enter the evaporimeter of second absorption heat pump XR2, First absorption heat pump XR1, heat again from returning to the second condenser 6 after First absorption heat pump XR1 flows out at last.The first water-cooled condenser cool cycles water discharge pipe 8 is connected with cooling tower 12 or a device for cooling 14, and unnecessary heat is entered atmosphere.Direct-air-cooling Power Plants the second water-cooled condenser 6 is connected with the admission pipeline of air cooler, and the exhaust steam in steam turbine some enters the second water-cooled condenser 6, and some enters air cooler.In this system heat supply network recirculated water and cooling circulating water two at the most the series flow in the platform heat pump make the performance of heat pump obtain optimization, every technical-economic index of power plant's cogeneration operation is further improved.
Described heat supply network backwater also can carry out heat exchange with the subcooler (not drawing in figure) that many heat pumps share.The water as refrigerant pipeline of each heat pump (not drawing in figure) is connected in parallel with subcooler, through backheat pump after the subcooler heat release.After the heat supply network backwater heats up in subcooler and another road merges.

Claims (3)

1. steam-water heating system for thermal power plant, comprise sucking condensing turbine (1), extracted steam from turbine pipe (3), the first water-cooled condenser (5), vapor-water heat exchanger (9) and absorption heat pump (XR1 ... n), described absorption heat pump (XR1 ... n) the n platform is arranged, n is 〉=2 natural number, it is characterized in that: described absorption heat pump (XR1 ... n) have additional subcooler (7), the increase of described system has second water-cooled condenser (6), steam power plant's heat supply network backwater is divided into the absorber that two tunnel: one road heat supply network backwater is introduced into First absorption heat pump (XR1) after entering power plant, enter again the absorber of second absorption heat pump (XR2) ... be connected in series successively, until enter the absorber of n platform absorption heat pump (XRn), the absorber that goes out n platform absorption heat pump (XRn) enters the condenser of this n platform absorption heat pump (XRn) again, then from n-1, n-2 ... be connected in series successively, condenser from First absorption heat pump (XR1) flows out at last, another road heat supply network backwater parallel connection enters each absorption heat pump (XR1 ... n) subcooler (7), two road heat supply network backwater merge at last, directly or again send after vapor-water heat exchanger (9), the evaporimeter recirculated water of the second water-cooled condenser (6) goes out the evaporimeter that is introduced into n platform absorption heat pump (XRn) after described the second water-cooled condenser (6), then return successively, enter at last the evaporimeter of second absorption heat pump (XR2), First absorption heat pump (XR1), return to the second water-cooled condenser (6) after the evaporimeter outflow of First absorption heat pump (XR1), the cool cycles water discharge pipe (8) of the first water-cooled condenser (5) is connected cooling system and is connected with steam power plant.
2. a kind of steam-water heating system for thermal power plant according to claim 1, it is characterized in that: the cooling system of described steam power plant is cooling tower (12), air cooling device (13) or a device for cooling (14).
3. a kind of steam-water heating system for thermal power plant according to claim 1 and 2, it is characterized in that: described each absorption heat pump (XR1 ... n) subcooler (7) is merged into a subcooler, each absorption heat pump (XR1 ... n) subcooler after this merging of water as refrigerant pipeline access in parallel, subcooler and another road heat supply network backwater that the heat supply network backwater goes out after this merging merge at last.
CN 201110203667 2011-07-20 2011-07-20 Steam-water heating system for thermal power plant Active CN102345895B (en)

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CN108518719A (en) * 2018-03-30 2018-09-11 大连葆光节能空调设备厂 A kind of big temperature-difference central heating system using double condensers

Citations (6)

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CN101109539A (en) * 2006-07-17 2008-01-23 葆光(大连)节能技术研究所有限公司 Method for enlarging thermoelectricity co-generating heat supplying scale
CN101231004A (en) * 2008-02-28 2008-07-30 清华大学 Large temperature-difference central heating system
CN101619662A (en) * 2009-08-14 2010-01-06 清华大学 Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way
CN101968236A (en) * 2010-09-03 2011-02-09 北京中科华誉能源技术发展有限责任公司 System for realizing combined heating based on extraction steam for heating and lithium bromide unit
CN102052702A (en) * 2010-11-18 2011-05-11 华北电力大学 Heating system and method by using power plant steam turbine bearing cooling water through heat pump
CN202141114U (en) * 2011-07-20 2012-02-08 双良节能系统股份有限公司 Vapor-water type heating system of thermal power plant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101109539A (en) * 2006-07-17 2008-01-23 葆光(大连)节能技术研究所有限公司 Method for enlarging thermoelectricity co-generating heat supplying scale
CN101231004A (en) * 2008-02-28 2008-07-30 清华大学 Large temperature-difference central heating system
CN101619662A (en) * 2009-08-14 2010-01-06 清华大学 Method for recovering waste heat of thermal power plant and heating and supplying heat to hot water in a stepping way
CN101968236A (en) * 2010-09-03 2011-02-09 北京中科华誉能源技术发展有限责任公司 System for realizing combined heating based on extraction steam for heating and lithium bromide unit
CN102052702A (en) * 2010-11-18 2011-05-11 华北电力大学 Heating system and method by using power plant steam turbine bearing cooling water through heat pump
CN202141114U (en) * 2011-07-20 2012-02-08 双良节能系统股份有限公司 Vapor-water type heating system of thermal power plant

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