CN102338409B - Composite heat supply system capable of recovering condensate waste heat of auxiliary machines of thermal power plant - Google Patents
Composite heat supply system capable of recovering condensate waste heat of auxiliary machines of thermal power plant Download PDFInfo
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- CN102338409B CN102338409B CN 201110198909 CN201110198909A CN102338409B CN 102338409 B CN102338409 B CN 102338409B CN 201110198909 CN201110198909 CN 201110198909 CN 201110198909 A CN201110198909 A CN 201110198909A CN 102338409 B CN102338409 B CN 102338409B
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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
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- Y02B30/12—Hot water central heating systems using heat pumps
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Abstract
The invention relates to a composite heat supply system capable of recovering condensate waste heat of auxiliary machines of a thermal power plant. The composite heat supply system comprises an auxiliary steam turbine (1), a first water-cooling condenser (2), a vapor-water heat exchanger (10) and absorptive heat pumps (XR1, ......, XRn), wherein supercoolers (4) are additionally arranged on the absorptive heat pumps (XR1, ......, XRn); the composite heat supply system is additionally provided with a second water-cooling condenser (3) and a water-water heat exchanger (14); return water of a heat supply network is divided into two paths before or after entering the second water-cooling condenser (3), wherein one path of return water of the heat supply network enters an absorber of the first absorptive heat pump (XR1), is then sequentially and serially connected until entering an absorber of the nth absorptive heat pump (XRn), enters a condenser of the nth absorptive heat pump (XRn), is then sequentially and serially connected and finally flows out of the condenser of the first absorptive heat pump (XR1); and the other path of return water of the heat supply network is connected in parallel and enters the supercooler (4) of each absorptive heat pump. According to the composite heat supply system disclosed by the invention, more condensate waste heat of the thermal power plant can be recovered, the operation efficiency of the heat pumps is improved, and the heat supply network system operates more reliably.
Description
Technical field
The present invention relates to a kind of cogeneration heating system, be applicable to that the auxiliary steam turbine exhaust steam of cogeneration power plant 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.Take full advantage 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 auxiliary steam turbine exhaust steam 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.Carry out refrigeration cool-down by the heat supply network backwater that power plant is confessed, use for the secondary net again as the waste heat source of heat pump, make the heat supply network return water temperature reduce back 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 absorption heat pump again, 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 whole heating season keys that reclaim condensation heat more, 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 auxiliary steam turbine is provided, the operational efficiency of raising heat pump and heat network system be the heating system of power plant's recovery subsidiary engine condensation waste heat of reliability service more.
The object of the present invention is achieved like this: a kind of steam power plant reclaims the combined type heating system of subsidiary engine condensation waste heat, comprise auxiliary steam turbine, first water-cooled condenser, vapor-water heat exchanger, main steam turbine extraction steam pipe 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 in sucking condensing turbine work done generating back.The auxiliary steam turbine exhaust steam condenses into water by condenser, and condensation waste heat is recycled.Described absorption heat pump has additional subcooler, system's increase has second water-cooled condenser and a water water-to-water heat exchanger, the heat supply network backwater is divided into two the tunnel before or after second water-cooled condenser entering, one road heat supply network backwater is introduced into the absorber of first absorption heat pump, enter the absorber of second absorption heat pump again ... be connected in series successively, until the absorber that enters n platform absorption heat pump, go out the condenser that enters this n platform absorption heat pump behind the absorber 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 parallel connection enters the subcooler of each absorption heat pump, two road heat supply network backwater merge at last, directly or again behind vapor-water heat exchanger, send, the cooling circulating water of first water-cooled condenser is discharged and is divided into two the tunnel, one road outlet pipe enters water water-to-water heat exchanger one rear flank and returns first condenser, the evaporimeter recirculated water of water water-to-water heat exchanger opposite side is introduced into the evaporimeter of n platform absorption heat pump XRn, return successively then, after the evaporimeter outflow of first absorption heat pump, return the water water-to-water heat exchanger at last; Another road outlet pipe inserts the cooling device of steam power plant.
Steam power plant of the present invention reclaims the combined type heating system of subsidiary engine condensation waste heat, described heat supply network backwater enters and is divided into two tunnel: one road heat supply network backwater earlier after the steam power plant and enters second water-cooled condenser, go out the absorber that enters first absorption heat pump behind second water-cooled condenser again, another road heat supply network backwater do not enter second water-cooled condenser and directly parallel connection enter the subcooler of each absorption heat pump.
Steam power plant of the present invention reclaims the combined type heating system of subsidiary engine condensation waste heat, described heat supply network backwater is introduced into second water-cooled condenser after entering power plant, go out to be further divided into behind second water-cooled condenser each absorption heat pump of serial connection behind the absorber that two tunnel: one road heat supply network backwater is introduced into first absorption heat pump, another road heat supply network backwater parallel connection enters the subcooler of each absorption heat pump.
Steam power plant of the present invention reclaims the combined type heating system of subsidiary engine condensation waste heat, 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.
The invention has the beneficial effects as follows:
Absorption heat pump in steam power plant has increased when subcooler and water-cooled condenser and water water-to-water heat exchanger are 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 and heat pump remaining hot 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, 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, utilize more auxiliary steam turbine exhaust steam 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.By 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, every economic technology economic indicator of steam power plant is further enhanced.
Description of drawings
Fig. 1 (a) shunts before second water-cooled condenser for the heat supply network backwater that the present invention relates to and cooling circulating water schematic diagram in parallel.
Fig. 1 (b) shunts behind second water-cooled condenser for the heat supply network backwater that the present invention relates to and cooling circulating water schematic diagram in parallel.
Reference numeral among the figure:
Heat supply network backwater A, heat supply network water supply A2, main steam turbine draw gas B, high steam C, coagulate water and go out D.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
Shown in Fig. 1 (a), Fig. 1 (a) shunts before second water-cooled condenser for the heat supply network backwater that the present invention relates to and cooling circulating water schematic diagram in parallel.By Fig. 1 (a) as can be seen, heating system is by auxiliary steam turbine 1, first water-cooled condenser (former) 2, second water-cooled condenser (increasing newly) 3, subcooler 4, outlet pipe 5, outlet pipe 6, cooling device 7, heat supply network return branch 8, heat supply network return branch 9, vapor-water heat exchanger 10, main steam turbine extraction steam pipe 11, auxiliary steam turbine exhaust steam pipe 12, auxiliary steam turbine exhaust steam pipe 13, water water-to-water heat exchanger (increasing newly) 14, evaporimeter circulating water line 15, absorption heat pump XR1 ... 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 8 and heat supply network return branch 9.One road heat supply network return branch 8 enters second water-cooled condenser 3, go out the absorber that enters first absorption heat pump XR1 behind second water-cooled condenser 3, go out the absorber that enters 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 enters n platform absorption heat pump XRn behind the absorber of n-1 platform absorption heat pump again, enter the condenser of n platform absorption heat pump XRn again, enter the condenser of n-1 platform absorption heat pump XR2 then, all the other and 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 is heated through second water-cooled condenser 3, again 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 9 direct parallel connections enter each absorption heat pump XR1 ... the subcooler 4 of n.Heat exchange heats up in subcooler 4, 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 send after vapor-water heat exchanger 10 heats up.Owing to enter evaporimeter after the water as refrigerant cooling, substantially eliminated the liquid state loss that water as refrigerant enters behind the 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 first water-cooled condenser 2(of steam power plant is former) cooling circulating water discharge and to be divided into two the tunnel: outlet pipe 5 and outlet pipe 6.One road outlet pipe 5 enters water water-to-water heat exchanger 14 1 and is sidelong heat back time first water-cooled condenser 2, and the evaporimeter circulating water line 15 of water water-to-water heat exchanger 14 opposite sides is introduced into the evaporimeter of n platform absorption heat pump XRn, return successively then, enter the evaporimeter of second absorption heat pump XR2, first absorption heat pump XR1, heat again from returning water water-to-water heat exchanger 14 after first absorption heat pump XR1 flows out at last; Another road outlet pipe 6 enters atmosphere to unnecessary heat by cooling device 7.In this system heat supply network recirculated water and evaporimeter recirculated 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.
Shown in Fig. 1 (b), Fig. 1 (b) shunts behind second water-cooled condenser for the heat supply network backwater that the present invention relates to and cooling circulating water schematic diagram in parallel.Fig. 1 (b) is to be divided into two the tunnel after the heat supply network backwater enters power plant behind second water-cooled condenser with Fig. 1 (a) difference.
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 heating up in subcooler, the heat supply network backwater merges with another road.
Claims (4)
1. a steam power plant reclaims the combined type heating system of subsidiary engine condensation waste heat, comprise auxiliary steam turbine (1), first water-cooled condenser (2), vapor-water heat exchanger (10), main steam turbine extraction steam pipe (11) 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 (4), the increase of described system has second water-cooled condenser (3) and a water water-to-water heat exchanger (14), the heat supply network backwater is divided into two the tunnel before or after second water-cooled condenser (3) entering, one road heat supply network backwater is introduced into the absorber of first absorption heat pump (XR1), enter the absorber of second absorption heat pump (XR2) again ... be connected in series successively, until the absorber that enters n platform absorption heat pump (XRn), go out the condenser that enters this n platform absorption heat pump (XRn) behind the absorber of n platform absorption heat pump (XRn) again, then from the condenser of n-1 platform absorption heat pump (XRn-1), the condenser of n-2 platform absorption heat pump (XRn-2) ... be connected in series successively, from the condenser of first absorption heat pump (XR1), flow out at last; Another road heat supply network backwater parallel connection enters each absorption heat pump (XR1 ... n) subcooler (4), two road heat supply network backwater merge at last, directly or again behind vapor-water heat exchanger (10), send, the cooling circulating water of first water-cooled condenser (2) is discharged and is divided into two the tunnel, one the tunnel enters water water-to-water heat exchanger (14) one rear flank returns first water-cooled condenser (2), the evaporimeter recirculated water of water water-to-water heat exchanger (14) opposite side is introduced into the evaporimeter of n platform absorption heat pump (XRn), return successively then, after the evaporimeter outflow of first absorption heat pump (XR1), return water water-to-water heat exchanger (14) at last; The cooling device (7) of steam power plant is inserted on another road.
2. a kind of steam power plant according to claim 1 reclaims the combined type heating system of subsidiary engine condensation waste heat, it is characterized in that: described heat supply network backwater enters and is divided into two tunnel: one road heat supply network backwater earlier after the steam power plant and enters second water-cooled condenser (3), go out the absorber that enters first absorption heat pump XR1 behind second water-cooled condenser (3) again, another road heat supply network backwater do not enter second water-cooled condenser (3) and directly parallel connection enter each absorption heat pump (XR1 ... n) subcooler (4).
3. a kind of steam power plant according to claim 1 reclaims the combined type heating system of subsidiary engine condensation waste heat, it is characterized in that: described heat supply network backwater is introduced into second water-cooled condenser (3) after entering power plant, go out to be further divided into behind second water-cooled condenser (3) each absorption heat pump (XR1 of serial connection behind the absorber that two tunnel: one road heat supply network backwater is introduced into first absorption heat pump (XR1) ... n) absorber, another road heat supply network backwater parallel connection enters each absorption heat pump (XR1 ... n) subcooler (4).
4. reclaim the combined type heating system of subsidiary engine condensation waste heats according to claim 1 or 2 or 3 described a kind of steam power plants, it is characterized in that: described each absorption heat pump (XR1 ... n) subcooler (4) 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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| CN 201110198909 CN102338409B (en) | 2011-07-16 | 2011-07-16 | Composite heat supply system capable of recovering condensate waste heat of auxiliary machines of thermal power plant |
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2011
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| JP2007064047A (en) * | 2005-08-30 | 2007-03-15 | Hitachi Eng Co Ltd | Waste heat recovery facility for steam turbine plant |
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