CN102338408A - 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 PDFInfo
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- CN102338408A CN102338408A CN2011101989084A CN201110198908A CN102338408A CN 102338408 A CN102338408 A CN 102338408A CN 2011101989084 A CN2011101989084 A CN 2011101989084A CN 201110198908 A CN201110198908 A CN 201110198908A CN 102338408 A CN102338408 A CN 102338408A
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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
Technical field
The present invention relates to a kind of cogeneration heating system, be applicable to that the exhaust steam of cogeneration power plant steam turbine is 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.Urban planning cogeneration in the north carries out central heating, to substitute original independent boiler central heating, realizes the requirement of energy-saving and emission-reduction.Make full use of steam power plant's used heat, to improve the heat capacity of steam power plant, realize energy-saving and emission-reduction better, guarantee the safe and reliable operation of steam power 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 source pump 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 condenser after, get into absorption heat pump again, see off after in heat pump, heating up.In this system, the temperature that recirculated water goes out heat pump is the keys of heat supply network in many recovery of whole heating season condensation heat, 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 objective 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 in thermal power plant tandem heating system of reliability service more.
The objective of the invention is to realize like this: a kind of circulating-water in thermal power plant tandem heating system; Comprise sucking condensing turbine, extracted steam from turbine pipe, water-cooled condenser, vapor-water heat exchanger and absorption heat pump; Said absorption heat pump has the n platform; N is >=2 natural number, and high 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.Exhaust steam in steam turbine condenses into water by condenser, and condensation waste heat is recycled.Said 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 first absorption heat pump after getting into power plant; Get into the absorber of second absorption heat pump again ... Be connected in series successively; Until the absorber that gets into n platform absorption heat pump; The absorber that goes out n platform absorption heat pump gets into the condenser of this n platform absorption heat pump again, then from n-1, n-2 ... Be connected in series successively, the condenser from first absorption heat pump flows out at last; Another road heat supply network backwater parallel connection gets into the subcooler of each absorption heat pump, and two road heat supply network backwater merge at last, directly or again behind vapor-water heat exchanger, see off; The cooling circulating water of water-cooled condenser goes out the evaporimeter that is introduced into n platform absorption heat pump behind the said water-cooled condenser; Return successively then; Get into the evaporimeter of second absorption heat pump, first absorption heat pump at last; After the evaporimeter outflow of first absorption heat pump, get into the cooling system of steam power plant.
Circulating-water in thermal power plant tandem heating system of the present invention, the cooling system of said steam power plant are a 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 in thermal power plant tandem heating system of the present invention; The subcooler of said each absorption heat pump is merged into a subcooler; The water as refrigerant 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.
Cold power plant between this circulating-water in thermal power plant tandem heating system also is applicable to.
The invention has the beneficial effects as follows:
Absorption heat pump in steam power plant has increased when subcooler supplies heat supply in winter to do heat supply 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 practiced thrift 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; 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 condensation heat, 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 recirculated water and cooling circulating water corresponding series flow in the absorber of each heat pump and condenser and evaporimeter, make the performance of heat pump obtain better optimize.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, each item 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 sketch map.
Reference numeral among the figure:
Sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, coagulate 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, coagulate water and go out D.The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further:
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 sketch map.Can find out by Fig. 1, heating system by sucking condensing turbine 1, generator 2, extracted steam from turbine pipe 3, coagulate 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 ... Compositions such as n and water pump, valve and connecting line.Said 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 getting into power plant: heat supply network return branch 9 and heat supply network return branch 10.One road heat supply network return branch 9 gets into the absorber of first absorption heat pump XR1; Go out the absorber that gets into second absorption heat pump XR2 behind the absorber of first absorption heat pump XR1, all the other and the like ... Go out the absorber that gets into n platform absorption heat pump XRn behind the absorber 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 then, all the other and the like;, after the condenser outflow of first absorption heat pump XR1.Just get into 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 directly parallel connection gets into each absorption heat pump XR1 ... The subcooler 7 of n.Heat exchange heats up in subcooler 7, has taken away the heat of absorption heat pump condensation water as refrigerant, and 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 after vapor-water heat exchanger 6 heats up, see off.Because water as refrigerant cooling back gets into evaporimeter; Basically eliminated the liquid state loss that water as refrigerant gets into behind the evaporimeter self flash distillation cooling; Make water as refrigerant 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.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; Return successively then; Get into the evaporimeter of second absorption heat pump XR2, first absorption heat pump XR1; After the evaporimeter outflow of first absorption heat pump XR1, enter atmosphere to unnecessary heat at last through a cooling tower 11 or a device for cooling 12.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, each item technical-economic index of power plant's cogeneration operation is further improved.
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 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 heating up in subcooler, the heat supply network backwater merges with another road.
Claims (3)
1. circulating-water in thermal power plant tandem heating system; 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); 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 (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 getting into power plant, get into the absorber of second absorption heat pump (XR2) again ... Be connected in series successively; Until the absorber that gets into n platform absorption heat pump (XRn); The absorber that goes out n platform absorption heat pump (XRn) gets into 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 gets into each absorption heat pump (XR1 ... N) subcooler (7), two road heat supply network backwater merge at last, directly or again behind vapor-water heat exchanger (6), see off; 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 said water-cooled condenser (5); Return successively then; Get into the evaporimeter of second absorption heat pump (XR2), first absorption heat pump (XR1) at last; After the evaporimeter outflow of first absorption heat pump (XR1), get into the cooling system of steam power plant.
2. a kind of circulating-water in thermal power plant tandem heating system according to claim 1 is characterized in that: the cooling system of said steam power plant is a cooling tower (11) or a device for cooling (12).
3. a kind of circulating-water in thermal power plant tandem heating system according to claim 1 and 2; It is characterized in that: said each absorption heat pump (XR1 ... N) subcooler (7) is merged into a subcooler; Each absorption heat pump (XR1 ... N) water as refrigerant 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.
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| CN 201110198908 CN102338408B (en) | 2011-07-16 | 2011-07-16 | Series-type heat supply system of circulating water in thermal power plant |
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| CN 201110198908 CN102338408B (en) | 2011-07-16 | 2011-07-16 | Series-type heat supply system of circulating water in thermal power plant |
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Cited By (5)
| 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 |
| CN104764069A (en) * | 2015-04-24 | 2015-07-08 | 珠海格力电器股份有限公司 | Compound type heat pump unit and concentrated heating system |
| CN104833133A (en) * | 2015-04-24 | 2015-08-12 | 珠海格力电器股份有限公司 | Composite type heat pump unit |
| CN109237587A (en) * | 2018-09-13 | 2019-01-18 | 华电电力科学研究院有限公司 | A kind of Low Vacuum Heating System and operation method coupling big temperature difference heat pump |
| WO2023092578A1 (en) * | 2021-11-29 | 2023-06-01 | 西门子股份公司 | Heat pump heat supply system |
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| 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 |
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| 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 |
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Cited By (7)
| 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 |
| CN104764069A (en) * | 2015-04-24 | 2015-07-08 | 珠海格力电器股份有限公司 | Compound type heat pump unit and concentrated heating system |
| CN104833133A (en) * | 2015-04-24 | 2015-08-12 | 珠海格力电器股份有限公司 | Composite type heat pump 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 |
| CN109237587A (en) * | 2018-09-13 | 2019-01-18 | 华电电力科学研究院有限公司 | A kind of Low Vacuum Heating System and operation method coupling big temperature difference heat pump |
| CN109237587B (en) * | 2018-09-13 | 2023-04-28 | 华电电力科学研究院有限公司 | Low-vacuum heat supply system coupled with large-temperature-difference heat pump and operation method |
| WO2023092578A1 (en) * | 2021-11-29 | 2023-06-01 | 西门子股份公司 | Heat pump heat supply system |
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| CN102338408B (en) | 2013-03-27 |
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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. |