CN102331024B - Water-water type heating system of thermal power plant - Google Patents
Water-water type heating system of thermal power plant Download PDFInfo
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- CN102331024B CN102331024B CN 201110203407 CN201110203407A CN102331024B CN 102331024 B CN102331024 B CN 102331024B CN 201110203407 CN201110203407 CN 201110203407 CN 201110203407 A CN201110203407 A CN 201110203407A CN 102331024 B CN102331024 B CN 102331024B
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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Abstract
The invention relates to a water-water type heating system of a thermal power plant. The heating system comprises an extraction condensing turbine (1), a water-cooling condenser (5) and absorption heat pumps (XR1...n), wherein the absorption heat pumps (XR1...n) are increasingly provided with subcoolers (7); the system is increasingly provided with a water-water heat exchanger (6); the backwater of a heat supply network enters a thermal power plant and is divided into two ways:one way of the backwater of the heat supply network firstly enters an absorber of a first absorption heat pump (XR1) and then enters the absorber of a second absorption heat pump (XR2) and finally enters the absorber of nth absorption heat pump (XRn) in serial connection in sequence, as well as reenters the condenser of the nth absorption heat pump (XRn) after going out of the absorber of the nth absorption heat pump (XRn), and finally goes out of the condenser of the first absorption heat pump (XR1) in serial connection in sequence; and the other way of the backwater of the heat supply network enters the subcooler (7) of all absorption heat pumps ( XR1...n) in parallel connection. The heating system provided by the invention has the advantage of recovering more condensing waste heat of the thermal power plant, thereby improving the operating efficiencies of the heat pumps.
Description
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 power plant system heat network system be the Water-water type heating system of thermal power plant of reliability service more.
The object of the present invention is achieved like this: a kind of Water-water type heating system of thermal power plant, comprise sucking condensing turbine, extracted steam from turbine pipe, water-cooled condenser 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.Absorption heat pump XR1 ... n has additional subcooler, and described system has increased a water water-to-water heat exchanger, and recirculated water one side in the water water-to-water heat exchanger is evaporimeter recirculated water, and opposite side is cooling circulating water; 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, go out the condenser that enters again this n platform absorption heat pump behind the absorber of n platform absorption heat pump, then from n-1, n-2 ... be connected in series successively, from the condenser of First absorption heat pump, go 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 is divided into two the tunnel after going out described water-cooled condenser, one tunnel water-to-water heat exchanger heating fumigators recirculated water that anhydrates, be connected cooling system and connect in another road with steam power plant, the evaporimeter recirculated water of water outlet water-to-water heat exchanger is introduced into the evaporimeter of n platform absorption heat pump, then return successively, enter second, the evaporimeter of First absorption heat pump, from the evaporimeter of First absorption heat pump, flow out at last, return the water water-to-water heat exchanger.
Water-water type heating system of thermal power plant of the present invention, described cooling system are cooling tower or a device for cooling.The cooling system of steam power plant can be that air and this water-cooled condenser go out water direct heat-exchange, also can be that air and water-cooled condenser water outlet indirect heat exchange enter atmosphere with heat.
Water-water type heating system of 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.
Cold power plant between this Water-water type heating system of thermal power plant also is applicable to.
The invention has the beneficial effects as follows:
Absorption heat pump in steam power plant has increased to have increased in subcooler and the system when water water-to-water heat exchanger 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.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 and technical norms of steam power plant are further enhanced.
Description of drawings
Fig. 1 is the schematic diagram that the heat supply network backwater is directly shunted and evaporimeter recirculated water circulates through the water water-to-water heat exchanger that the present invention relates to.
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(are former), water water-to-water heat exchanger 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, a device for cooling 13, evaporimeter circulating water pipe 14, 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 evaporimeter recirculated water circulates through the water water-to-water heat exchanger that the present invention relates to.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, water water-to-water heat exchanger 6, 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, a device for cooling 13, evaporimeter circulating water pipe 14, absorption heat pump XR1 ... n.And the compositions such as 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 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 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 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 11 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 9 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.The cool cycles water discharge pipe 8 of the water-cooled condenser 5 of steam power plant is divided into two tunnel: one tunnel water-to-water heat exchanger 6 heating of anhydrating, and another road enters atmosphere to unnecessary heat by cooling tower 12 or a device for cooling 13.The evaporimeter recirculated water of the water water-to-water heat exchanger 6 of steam power plant after heating as the low-temperature heat source of heat pump, the evaporimeter circulating water pipe 14 that goes out described water water-to-water heat exchanger 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 water water-to-water heat exchanger 6 after the evaporimeter of First absorption heat pump XR1 flows out 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. Water-water type heating system of thermal power plant, comprise sucking condensing turbine (1), extracted steam from turbine pipe (3), water-cooled condenser (5) 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: absorption heat pump (XR1 ... n) have additional subcooler (7), described system has increased a water water-to-water heat exchanger (6), recirculated water one side in the water water-to-water heat exchanger (6) is evaporimeter recirculated water, and opposite side is cooling circulating water; 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), go out the condenser that enters again this n platform absorption heat pump (XRn) behind the absorber of n platform absorption heat pump (XRn), then from n-1, n-2 ... be connected in series successively, from the condenser of First absorption heat pump (XR1), go 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 (9); Parallel connection entered water water-to-water heat exchanger (6) and cooling system after the cooling circulating water of water-cooled condenser (5) went out described water-cooled condenser (5); The evaporimeter recirculated water of water outlet water-to-water heat exchanger (6) is introduced into the evaporimeter of n platform absorption heat pump (XRn), then return successively, enter second, the evaporimeter of First absorption heat pump, from the evaporimeter of First absorption heat pump (XR1), flow out at last, return water water-to-water heat exchanger (6).
2. a kind of Water-water type heating system of thermal power plant according to claim 1, it is characterized in that: described cooling system is cooling tower (12) or a device for cooling (13).
3. a kind of Water-water type heating system of 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110203407 CN102331024B (en) | 2011-07-20 | 2011-07-20 | Water-water type heating system of thermal power plant |
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| CN 201110203407 CN102331024B (en) | 2011-07-20 | 2011-07-20 | Water-water type heating system of thermal power plant |
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| CN102331024B true CN102331024B (en) | 2013-03-27 |
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| CN108800275B (en) * | 2018-07-16 | 2023-05-26 | 河南理工大学 | Large-temperature-difference central heating system utilizing waste heat of power plant and working method |
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| JP4578354B2 (en) * | 2005-08-30 | 2010-11-10 | 株式会社日立エンジニアリング・アンド・サービス | Waste heat utilization equipment for steam turbine plant |
| JP4676284B2 (en) * | 2005-08-30 | 2011-04-27 | 株式会社日立エンジニアリング・アンド・サービス | Waste heat recovery equipment for steam turbine plant |
| CN202141115U (en) * | 2011-07-20 | 2012-02-08 | 双良节能系统股份有限公司 | Water-water type heating system of thermal power plant |
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2011
- 2011-07-20 CN CN 201110203407 patent/CN102331024B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536296A (en) * | 2003-04-11 | 2004-10-13 | 清华大学 | Heat pump type heat and electircity combined supply system by using as turbine as power |
| JP4578354B2 (en) * | 2005-08-30 | 2010-11-10 | 株式会社日立エンジニアリング・アンド・サービス | Waste heat utilization equipment for steam turbine plant |
| JP4676284B2 (en) * | 2005-08-30 | 2011-04-27 | 株式会社日立エンジニアリング・アンド・サービス | Waste heat recovery equipment for steam turbine plant |
| US7610768B2 (en) * | 2005-11-09 | 2009-11-03 | Honeywell International Inc. | Apparatus and methods for water regeneration from waste |
| CN1959220A (en) * | 2006-09-06 | 2007-05-09 | 清华大学 | Heating system of water source heat pump by using remaining heat of condensed steam from power plant |
| 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 |
| CN202141115U (en) * | 2011-07-20 | 2012-02-08 | 双良节能系统股份有限公司 | Water-water type heating system of thermal power plant |
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| CN102331024A (en) | 2012-01-25 |
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