CN102330579A - Combined type heating system for recovering condensation waste heat of main stream turbine and auxiliary stream turbine of thermal power plant - Google Patents
Combined type heating system for recovering condensation waste heat of main stream turbine and auxiliary stream turbine of thermal power plant Download PDFInfo
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- CN102330579A CN102330579A CN201110211919A CN201110211919A CN102330579A CN 102330579 A CN102330579 A CN 102330579A CN 201110211919 A CN201110211919 A CN 201110211919A CN 201110211919 A CN201110211919 A CN 201110211919A CN 102330579 A CN102330579 A CN 102330579A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The invention relates to a combined type heating system for recovering condensation waste heat of a main stream turbine and an auxiliary stream turbine of a thermal power plant. The heating system comprises an extraction condensing turbine (1), a main stream turbine steam extraction pipe (3), a first water-cooled condenser (5), an auxiliary stream turbine (6), a second water-cooled condenser (7), a water-water heat exchanger (8), subcoolers (9), a stream-water heat exchanger (10) and absorption heat pumps; backwater of a heat supply network is divided into two paths before or after entering the water-water heat exchanger (8), wherein after entering an absorber of the first absorption heat pump XR1, one path of the backwater of the heat supply network is connected in series with the absorption heat pumps from XR1 to XRn, flows out of an absorber of the nth absorption heat pump XRn, enters a condenser of the nth absorption heat pump, and then is connected with condensers of the absorption heat pumps; the other path of the backwater of the heat supply network enters the subcoolers (9) of the absorption heat pumps in parallel; and the the backwater of two paths of the heat supply network are finally combined and directly discharged or discharged after being heated. By the heating system, more condensation waste heat of the thermal power plant can be recovered, the running efficiency of the heat pumps is improved, and a heat supply network system runs reliably.
Description
Technical field
The present invention relates to a kind of cogeneration heating system, be applicable to that the main and auxiliary exhaust steam in steam turbine of cogeneration power plant is more energy-conservation, utilize safely and reliably, heat network system more utilizes condensation waste heat.
Background technique
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.Urban planning cogeneration in the north carries out central heat supply, to substitute original independent boiler central heat supply, realizes the requirement of energy-saving and emission-reduction.Make full use of thermoelectricity plant's used heat, to improve the heat capacity of thermoelectricity plant, realize energy-saving and emission-reduction better, guarantee the safe and reliable operation of thermoelectricity plant and heat supply network simultaneously again, various new flow processs require study.Realize the more turbine discharge used heat that reclaims in the power plant, the most important condition is that adopting on this basis with the electricity is the heat pump unit of power, or is the absorption type heat pump assembly of power with the heat supply network high-temperature water with the secondary net return water temperature reduction of hot user side.Heat supply network backwater through power plant is confessed carries out refrigeration cool-down, supplies the secondary net to use again as the waste heat source of heat pump, makes the heat supply network return water temperature reduce back telegram in reply factory.Power plant heat supply network backwater is introduced into former plant condenser after getting into power plant, with electric power plant circulating water be blended in heat up in the vapour condenser after, get into absorption heat pump again, see off after in heat pump, heating up.In this system, the temperature that circulating water goes out heat pump is the keys of heat supply network in many recovery of whole heating season heat of condensation, in same outlet temperature, can reclaim more condensation waste heat, and become the another difficult problem of thermoelectricity plant's central heat supply technology with high-grade drawing gas less.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of condensation waste heat of realizing reclaiming more thermoelectricity plants is provided, the operational efficiency of raising heat pump and the heat network system more thermoelectricity plant of reliable operation reclaim main and auxiliary machine condensation waste heat combined type heating system.
The objective of the invention is to realize like this: a kind of thermoelectricity plant reclaims main and auxiliary machine condensation waste heat combined type heating system; Comprise sucking condensing turbine, main steam turbine extraction steam pipe, first and second water-cooled condenser, auxiliary steam turbine, vapor-water heat exchanger and absorption heat pump; Said absorption heat pump has the n platform, and n is >=2 natural number.High pressure steam is extracted the thermal source of part steam as absorption heat pump and vapor-water heat exchanger out in sucking condensing turbine work done generating back.Main and auxiliary exhaust steam in steam turbine condenses into water by vapour condenser, and condensation waste heat is recycled.It is characterized in that: described absorption heat pump has additional subcooler, in thermoelectricity plant, increases a water water-to-water heat exchanger, and the auxiliary steam turbine exhaust steam inserts second water-cooled condenser.The heat supply network backwater is divided into two the tunnel before or after entering water water-to-water heat exchanger; One road heat supply network backwater is introduced into the adsorber of first absorption heat pump, gets into the adsorber of second absorption heat pump again ... Be connected in series successively, until the adsorber that gets into n platform absorption heat pump; Go out the condenser that gets into this n platform absorption heat pump behind the adsorber of n platform absorption heat pump again; Then from n-1, n-2 ... Be connected in series successively, from the condenser of first absorption heat pump, flow out at last, another road heat supply network backwater is the subcooler of each absorption heat pump of parallel connection entering respectively; Two road heat supply network backwater merge at last, directly or again behind vapor-water heat exchanger, see off.The cooling circulating water of first water-cooled condenser is divided into two tunnel: one road vaporizer connection of access n platform absorption heat pump earlier after going out said first water-cooled condenser; Return successively then; Get into the vaporizer of second, first absorption heat pump; From the vaporizer of first absorption heat pump, go out at last, return first water-cooled condenser; The cooling system of thermoelectricity plant is inserted on another road; The cooling circulating water of second water-cooled condenser goes out the cooling system that parallel connection behind described second water-cooled condenser inserts water water-to-water heat exchanger and thermoelectricity plant.The cooling system of thermoelectricity plant can be that air and this first water-cooled condenser go out water direct heat-exchange, also can be that the air and the first water-cooled condenser water outlet indirect exchange enter atmosphere with heat.
Thermoelectricity plant of the present invention reclaims main and auxiliary machine condensation waste heat combined type heating system; Said heat supply network backwater is divided into two tunnel: one road heat supply network backwater entering water water-to-water heat exchanger earlier after getting into thermoelectricity plant; Get into the adsorber of first absorption heat pump behind the water outlet water-to-water heat exchanger again, another road heat supply network backwater does not get into the water water-to-water heat exchanger and the directly parallelly connected subcooler that gets into each absorption heat pump.
Thermoelectricity plant of the present invention reclaims main and auxiliary machine condensation waste heat combined type heating system; Said heat supply network backwater gets into advanced entry water-to-water heat exchanger after the thermoelectricity plant; Be further divided into the adsorber of first absorption heat pump of two tunnel: one tunnel entering behind the water outlet water-to-water heat exchanger, another road parallel connection gets into the subcooler of each absorption heat pump.
Thermoelectricity plant of the present invention reclaims main and auxiliary machine condensation waste heat combined type heating system; The subcooler of said each absorption heat pump is merged into a subcooler; The cryogen water pipeline parallel connection of each absorption heat pump inserts the subcooler after this merging, and subcooler and another road heat supply network backwater that the heat supply network backwater goes out after this merging merge at last.
Thermoelectricity plant of the present invention reclaims main and auxiliary machine condensation waste heat combined type heating system, and the cooling system of said thermoelectricity plant is a cooling tower or a device for cooling.
This thermoelectricity plant reclaim main and auxiliary machine condensation waste heat combined type heating system also be applicable between cold power plant.
The invention has the beneficial effects as follows:
Absorption heat pump in thermoelectricity plant has increased when subcooler and water water-to-water heat exchanger supply heat supply in winter to do heat supply season and has moved.Heat supply network circulating 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.In the condensing temperature of heating season raising subsidiary engine, make heat supply network can directly draw waste heats with the hot net water direct heat transfer more, but do not influence main engine power generation.Adopt heat supply network circulating 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 practiced thrift more than 8% than original system.Because heat pump has been used high-grade energy less in reclaiming thermoelectricity plant's condensation waste heat process; So compare with former heat pump; Under 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 reclaims condenser heat and realizes maximization when heating demand descends, and is utilizing more exhaust steam in steam turbine to be used for heating in whole heating season.On the other hand, owing to reclaim same heat of condensation, the circulating water temperature that goes out heat pump is low, under same outlet temperature situation, and the recyclable more condensation waste heat of heat pump.Through heat supply network circulating water and cooling circulating water corresponding series flow in adsorber, condenser and the vaporizer of each heat pump, make the performance of heat pump obtain better optimize.The volume of heat pump, weight indicator can descend greatly, and manufacture cost can descend simultaneously.On the other hand, because the performance optimization of heat pump, each item economic technology economic indicator of thermoelectricity plant is further enhanced.
Description of drawings
Fig. 1 (a) divides flow diagram for the heat supply network backwater that the present invention relates to before the water water-to-water heat exchanger.
Fig. 1 (b) divides flow diagram for the heat supply network backwater that the present invention relates to behind the water water-to-water heat exchanger.
Reference character among the figure:
Sucking condensing turbine 1, generator 2, main steam turbine extraction steam pipe 3, coagulate water pipe 4, first water-cooled condenser 5 (former), auxiliary steam turbine 6, second water-cooled condenser 7 (former), water water-to-water heat exchanger 8 (increase), subcooler 9, vapor-water heat exchanger 10, heat supply network return branch 11, heat supply network return branch 12, discharge water pipe 13, discharge water pipe 14, cooling tower 15 and absorption heat pump XR1 ... N.
Heat supply network backwater A1, heat supply network water supply A2, high pressure steam B, exhaust steam in steam turbine C, coagulate water and go out D, jockey pulley machine exhaust steam E.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further:
Embodiment 1:
Shown in Fig. 1 (a), Fig. 1 (a) divides flow diagram for the heat supply network backwater that the present invention relates to before the water water-to-water heat exchanger.Can find out by Fig. 1 (a), thermoelectricity plant of the present invention reclaim main and auxiliary machine condensation waste heat combined type heating system by sucking condensing turbine 1, generator 2, main steam turbine extraction steam pipe 3, coagulate water pipe 4, first water-cooled condenser 5, auxiliary steam turbine 6, second water-cooled condenser 7, water water-to-water heat exchanger 8, subcooler 9, vapor-water heat exchanger 10, heat supply network return branch 11, heat supply network return branch 12, discharge water pipe 13, discharge water pipe 14, cooling tower 15 and absorption heat pump XR1 ... Compositions such as n and water pump, valve and connecting pipeline.Said absorption heat pump XR1 ... N has the n platform, and n is >=2 natural number.The auxiliary steam turbine exhaust steam inserts second water-cooled condenser 7.The heat supply network backwater is divided into two the tunnel after getting into power plant: heat supply network return branch 11 and heat supply network return branch 12.One road heat supply network return branch 11 inserts water water-to-water heat exchangers 8, and water outlet water-to-water heat exchanger 8 backs get into the adsorbers of first absorption heat pump XR1, goes out the adsorber that gets into second absorption heat pump XR2 behind the adsorber of first absorption heat pump XR1; All the other and the like;, go out the adsorber that gets into n platform absorption heat pump XRn behind the adsorber of n-1 platform absorption heat pump XR2 again, get into the condenser of n platform absorption heat pump XRn again; Get into the condenser of n-1 platform absorption heat pump XR2 then; All the other and the like ..., after the condenser of first absorption heat pump XR1 go out.Just get into the condenser of absorption heat pump XR2 after the minimum adsorber 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 is heated through water water-to-water heat exchanger 8; Again through first absorption heat pump XR1, second absorption heat pump XR2 ... The adsorber 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 12 directly parallel connection gets into each absorption heat pump XR1 ... The subcooler 9 of n.Heat exchange heats up in subcooler 9, has taken away the heat of absorption heat pump condensation cryogen water, and the heat of the cryogen water that the heat pump generator produces has obtained effective utilization.Two road heat supply network backwater merge at last, directly or again after vapor-water heat exchanger 10 heats up, see off.Because cryogen water cooling back gets into vaporizer; Basically eliminated the liquid state loss that cryogen water gets into behind the vaporizer self flash distillation cooling; Make cryogen water can all be used for refrigeration, the COP value of heat pump is improved, reached the effect that one action two gets cooling circulating water.Cool cycles water discharge pipe in first water-cooled condenser 5 of thermoelectricity plant is divided into two the tunnel: the one tunnel and discharges the vaporizer that water pipe 13 is introduced into n platform absorption heat pump XRn; Return successively then; Get into the vaporizer of second absorption heat pump XR2, first absorption heat pump XR1, heat again from returning first water-cooled condenser 5 after first absorption heat pump XR1 flows out at last.Another road is discharged water pipe 14 and is entered atmosphere to unnecessary heat through cooling tower 15.The cooling circulating water of second water-cooled condenser 7 goes out the cooling system that the 7 back parallel connections of described second water-cooled condenser insert water water-to-water heat exchanger 8 and thermoelectricity plant.In this system heat supply network circulating 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, each item technical-economic index of power plant's cogeneration operation is further improved.
Embodiment 2:
Shown in Fig. 1 (b), Fig. 1 (b) divides flow diagram for the heat supply network backwater that the present invention relates to behind the water water-to-water heat exchanger.Fig. 1 (b) is behind water water-to-water heat exchanger 8, to be divided into two the tunnel after the heat supply network backwater gets into power plant with Fig. 1 (a) difference.
Described heat supply network backwater also can carry out heat exchange with a shared subcooler (not drawing among the figure) of many heat pumps.The cryogen water 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 heating up in subcooler, the heat supply network backwater merges with another road.
Claims (5)
1. a thermoelectricity plant reclaims main and auxiliary machine condensation waste heat combined type heating system; Comprise sucking condensing turbine (1), main steam turbine extraction steam pipe (3), first water-cooled condenser (5), auxiliary steam turbine (6), second water-cooled condenser (7), vapor-water heat exchanger (10) and absorption heat pump (XR1 ... N); Said absorption heat pump (XR1 ... N) the n platform is arranged; N is >=2 natural number, it is characterized in that: said absorption heat pump (XR1 ... N) have additional subcooler (9), system's increase has a water water-to-water heat exchanger (8); The auxiliary steam turbine exhaust steam inserts second water-cooled condenser (7); The heat supply network backwater is divided into the adsorber that two tunnel, one road heat supply network backwater is introduced into first absorption heat pump (XR1) before or after entering water water-to-water heat exchanger (8), get into the adsorber of second absorption heat pump (XR2) again ... Be connected in series successively; Until the adsorber that gets into n platform absorption heat pump (XRn); Go out the condenser that gets into this n platform absorption heat pump (XRn) behind the adsorber of n platform absorption heat pump (XRn) again, 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 gets into each absorption heat pump (XR1 ... N) subcooler (9); Two road heat supply network backwater merge at last; Directly or again behind vapor-water heat exchanger (10), see off; The cooling circulating water of first water-cooled condenser (5) is divided into two tunnel: one road vaporizer connection of access n platform absorption heat pump (XRn) earlier after going out said first water-cooled condenser (5), returns successively then, gets into the vaporizer of second, first absorption heat pump; From the vaporizer of first absorption heat pump (XR1), go out at last, return first water-cooled condenser (5); The cooling system of thermoelectricity plant is inserted on another road; The cooling circulating water of second water-cooled condenser (7) goes out the cooling system that the parallel connection of described second water-cooled condenser (7) back inserts water water-to-water heat exchanger (8) and thermoelectricity plant.
2. a kind of thermoelectricity plant according to claim 1 reclaims main and auxiliary machine condensation waste heat combined type heating system; It is characterized in that: the heat supply network backwater is divided into two tunnel: one road heat supply network backwater entering water water-to-water heat exchanger (8) earlier after getting into thermoelectricity plant; Get into the adsorber of first absorption heat pump (XR1) behind the water outlet water-to-water heat exchanger (8) again, another road heat supply network backwater does not get into water water-to-water heat exchanger (8) and directly parallelly connected each absorption heat pump (XR1 that gets into ... N) subcooler (9).
3. a kind of thermoelectricity plant according to claim 1 reclaims main and auxiliary machine condensation waste heat combined type heating system; It is characterized in that: said heat supply network backwater gets into advanced entry water-to-water heat exchanger (8) after the thermoelectricity plant; Be further divided into the adsorber of two tunnel: one tunnel first absorption heat pump of entering (XR1) behind the water outlet water-to-water heat exchanger (8), another road parallel connection gets into each absorption heat pump (XR1 ... N) subcooler (9).
4. reclaim main and auxiliary machine condensation waste heat combined type heating system according to claim 1 or 2 or 3 described a kind of thermoelectricity plants; It is characterized in that: said each absorption heat pump (XR1 ... N) subcooler (9) is merged into a subcooler; Each absorption heat pump (XR1 ... N) cryogen water pipeline parallel connection inserts the subcooler after this merging, and subcooler and another road heat supply network backwater that the heat supply network backwater goes out after this merging merge at last.
5. reclaim main and auxiliary machine condensation waste heat combined type heating system according to claim 1 or 2 or 3 described a kind of thermoelectricity plants, it is characterized in that: the cooling system of said thermoelectricity plant is a cooling tower (15) or a device for cooling.
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| CN201110211919.1A CN102330579B (en) | 2011-07-27 | 2011-07-27 | Combined type heating system for recovering condensation waste heat of main stream turbine and auxiliary stream turbine of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628938A (en) * | 2013-12-04 | 2014-03-12 | 大连葆光节能空调设备厂 | System for greatly reducing cogeneration centralized heat supply temperature |
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Inventor after: Li Baoshan Inventor after: Jia Jia Inventor after: Zhang Liangliang Inventor before: Jiang Rongfang Inventor before: Mao Hongcai Inventor before: Cai Xiaorong |
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Effective date of registration: 20180209 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. |
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