CN102338408B - Series-type heat supply system of circulating water in thermal power plant - Google Patents

Series-type heat supply system of circulating water in thermal power plant Download PDF

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Publication number
CN102338408B
CN102338408B CN 201110198908 CN201110198908A CN102338408B CN 102338408 B CN102338408 B CN 102338408B CN 201110198908 CN201110198908 CN 201110198908 CN 201110198908 A CN201110198908 A CN 201110198908A CN 102338408 B CN102338408 B CN 102338408B
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heat pump
water
absorption heat
type heat
absorption type
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CN102338408A (en
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王宁红
江荣方
毛洪财
蔡小荣
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Taiyuan renewable energy supply 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]
    • Y02B30/12Hot water central heating systems using heat pumps

Abstract

The invention relates to a series-type heat supply system of circulating water in a thermal power plant; the series-type heat supply system comprises an extraction condensing type steam turbine (1), a water-cooling condenser (5), a steam-water heat exchanger (6) and absorption type heat pumps (XR......n), wherein the absorption type heat pumps (XR......n) are additionally provided with subcoolers (7); backwater of a heat network is divided into two paths after flowing into the power plant, wherein one path of backwater firstly flows into an absorber of the first absorption type heat pump (XR1), then flows into an absorber of the second absorption type heat pump (XR2) and absorbers of other absorption type heat pumps and are sequentially connected in series till flowing into an absorber of the nth absorption type heat pump (XRn); the first path of back water flows out from the absorber of the nth absorption type heat pump, then flows into the condenser of the nth absorption type heat pump, is connected sequentially in series from the condensers of the n-1th absorption type heat pump (XRn-1), the n-2th absorption type heat pump (XRn-2) and other absorption type heat pumps, and finally flows out from the condenser of the first absorption type heat pump (XR1); and the other path of the backwater flowing into the subcoolers (7) of all the absorption type heat pumps (XR1......n) in parallel, and the two paths of the backwater of the heat network are combined finally. The series-type heat supply system has the advantages of being capable of recycling more condensed waste heat of the thermal power plant, improving the operating efficiency of the heat pumps and enabling the operation of a heat network system to be more reliable.

Description

Circulating-water tandem
Technical field
The present invention relates to a kind of thermoelectric combined heating system, be applicable to more energy-conservation, the safely and reliably utilization of cogeneration power plant steam turbine exhaust steam, 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 the 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 the condenser heat up after, enter again absorption heat pump, send after in heat pump, heating up.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 circulating-water tandem of reliability service more.
The object of the present invention is achieved like this: a kind of circulating-water tandem, comprise sucking condensing turbine, extracted steam from turbine pipe, 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 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, the 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 behind vapor-water heat exchanger; The cooling circulating water of water-cooled condenser goes out the evaporimeter that is introduced into n platform absorption heat pump behind the described water-cooled condenser, then return successively, enter at last the evaporimeter of second absorption heat pump, First absorption heat pump, after the evaporimeter outflow of First absorption heat pump, enter the cooling system of steam power plant.
Circulating-water tandem of the present invention, the cooling system of described steam power plant are cooling tower or a device for cooling.The cooling system of steam power plant also can be that air and water-cooled condenser water outlet indirect heat exchange enter atmosphere with heat.
Circulating-water tandem 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.
Cold power plant between this circulating-water tandem also is applicable to.
The invention has the beneficial effects as follows:
Absorption heat pump in steam power plant has increased when subcooler is done heat supply for heat supply in winter season and has moved.Heat supply network recirculated water and power plant's cool cycles water separation 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 because 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 reclaims 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 maximization, is used for heating at the more exhaust steam in steam turbine of whole Heating Season utilization.On the other hand, owing to reclaim 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, because the performance optimization of heat pump, every economic technology economic indicator of steam power plant is further enhanced.
Description of drawings
Fig. 1 is that the heat supply network backwater that the present invention relates to is directly shunted and cooling circulating water series connection schematic diagram.
Reference numeral among the figure:
Sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, solidifying water pipe 4, water-cooled condenser 5, vapor-water heat exchanger 6, subcooler 7, cool cycles water discharge pipe 8, heat supply network return branch 9, heat supply network return branch 10, cooling tower 11, a device for cooling 12, 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 that the heat supply network backwater that the present invention relates to is directly shunted and cooling circulating water series connection schematic diagram.As seen from Figure 1, heating system is by sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, solidifying water pipe 4, water-cooled condenser 5, vapor-water heat exchanger 6, subcooler 7, cool cycles water discharge pipe 8, heat supply network return branch 9, heat supply network return branch 10, cooling tower 11, a device for cooling 12, 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 9 and heat supply network return branch 10.One road heat supply network return branch 9 enters the absorber of First absorption heat pump XR1, go out the absorber that enters second absorption heat pump XR2 behind 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 behind 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, all the other the like,, flow 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 absorption heat pump XR1 behind 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.Another road heat supply network return branch 10 direct parallel connections enter each absorption heat pump XR1 ... the subcooler 7 of n.Heat up in subcooler 7 interior heat exchange, 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 6 heats up.Owing to enter evaporimeter after the water as refrigerant cooling, elimination water as refrigerant enter behind the evaporimeter liquid state loss of 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 at one stroke two effects that get.Cooling circulating water in the water-cooled condenser 5 of steam power plant is introduced into the evaporimeter of n platform absorption heat pump XRn through cool cycles water discharge pipe 8, then return successively, enter the evaporimeter of second absorption heat pump XR2, First absorption heat pump XR1, after the evaporimeter outflow of First absorption heat pump XR1, by cooling tower 11 or a device for cooling 12 unnecessary heat is entered atmosphere at last.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 among the figure) that many heat pumps share.The water as refrigerant pipeline of each heat pump (not drawing among the 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. circulating-water tandem, comprise sucking condensing turbine (1), extracted steam from turbine pipe (3), water-cooled condenser (5), vapor-water heat exchanger (6) 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 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, the 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 behind vapor-water heat exchanger (6); The cooling circulating water of water-cooled condenser (5) goes out the evaporimeter that is introduced into n platform absorption heat pump (XRn) behind the described water-cooled condenser (5), then return successively, enter at last the evaporimeter of second absorption heat pump (XR2), First absorption heat pump (XR1), after the evaporimeter outflow of First absorption heat pump (XR1), enter the cooling system of steam power plant.
2. a kind of circulating-water tandem according to claim 1, it is characterized in that: the cooling system of described steam power plant is cooling tower (11) or a device for cooling (12).
3. a kind of circulating-water tandem 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 201110198908 2011-07-16 2011-07-16 Series-type heat supply system of circulating water in thermal power plant Active CN102338408B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103673035A (en) * 2013-11-08 2014-03-26 清华大学 Combined type heat exchange unit
CN104764069B (en) * 2015-04-24 2018-05-08 珠海格力电器股份有限公司 Composite type heat pump assembly and central heating system
CN104833133B (en) * 2015-04-24 2018-02-09 珠海格力电器股份有限公司 Composite type heat pump assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN101865488A (en) * 2010-06-01 2010-10-20 何培斌 Exhaust residual heat utilizing method for large-capacity heat and power cogeneration concentrated heat supply generator set
CN102094744A (en) * 2010-12-05 2011-06-15 侯创新 Condensate water and cooling water regenerating device of thermal power plant and nuclear power plant
CN202216315U (en) * 2011-07-16 2012-05-09 双良节能系统股份有限公司 Circulating-water tandem-type heat supply system for thermal power plant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN101865488A (en) * 2010-06-01 2010-10-20 何培斌 Exhaust residual heat utilizing method for large-capacity heat and power cogeneration concentrated heat supply generator set
CN102094744A (en) * 2010-12-05 2011-06-15 侯创新 Condensate water and cooling water regenerating device of thermal power plant and nuclear power plant
CN202216315U (en) * 2011-07-16 2012-05-09 双良节能系统股份有限公司 Circulating-water tandem-type heat supply system for thermal power plant

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Inventor after: Li Baoshan

Inventor after: Zhang Liangliang

Inventor after: Jia Jia

Inventor before: Wang Ninghong

Inventor before: Jiang Rongfang

Inventor before: Mao Hongcai

Inventor before: Cai Xiaorong

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Effective date of registration: 20180213

Address after: 030006 Shanxi province Taiyuan economic and Technological Development Zone, Taiyuan City regenerative energy heating Co., Ltd.

Patentee after: Taiyuan renewable energy supply Co., Ltd.

Address before: 214444 Jiangsu city of Wuxi province Jiangyin City Li Town Road No. 1 West

Patentee before: Shuangliang Energy Saving System Co., Ltd.