CN103090358A - Cooling water heat recovery system of power plant and heat recovery method - Google Patents

Cooling water heat recovery system of power plant and heat recovery method Download PDF

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Publication number
CN103090358A
CN103090358A CN2013100250534A CN201310025053A CN103090358A CN 103090358 A CN103090358 A CN 103090358A CN 2013100250534 A CN2013100250534 A CN 2013100250534A CN 201310025053 A CN201310025053 A CN 201310025053A CN 103090358 A CN103090358 A CN 103090358A
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China
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condensate
heat
cooling water
heat exchanger
water
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CN103090358B (en
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岳建华
毕春海
李勐
岳涛
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China Shenhua Energy Co Ltd
Beijing Guohua Electric Power Co Ltd
Shenhua Guohua Beijing Electric Power Research Institute Co Ltd
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China Shenhua Energy Co Ltd
Beijing Guohua Electric Power Co Ltd
Shenhua Guohua Beijing Electric Power Research Institute Co Ltd
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Priority to CN201310025053.4A priority Critical patent/CN103090358B/en
Publication of CN103090358A publication Critical patent/CN103090358A/en
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Abstract

The invention provides a cooling water heat recovery system of a power plant. The system comprises an auxiliary engine cooling water circulation subsystem which is provided with an auxiliary engine cooling water backwater pipeline (5) and a condensation water circulation subsystem which is provided with a condensate polishing unit (8). The cooling water heat recovery system is provided with a first heat exchanger (2) which is capable of transmitting the heat of the fluid in a low temperature pipeline to the fluid of a high temperature pipeline, the low temperature pipeline of the first heat exchanger is connected with the auxiliary engine cooling water backwater pipeline (5) in series, and the high temperature pipeline of the first heat exchanger is connected with a condensation water pipeline in the lower reaches of the condensate polishing unit in series along the flow direction of condensation water. On the other hand, the invention further provides a heat recovery method of the cooling water heat recovery system of the power plant. The cooling water heat recovery system can effectively recover the heat in the backwater of the auxiliary engine cooling water of the power plant, prevent an auxiliary engine cooling tower from discharging steam into the air, and eliminate the accident potential.

Description

The cooling water heat recovering system in power plant and heat recovery method thereof
Technical field
The present invention relates to the thermal power generation field, particularly, relate to a kind of cooling water heat recovering system and heat recovery method of power plant.
Background technology
In the water circulation system in existing thermal power plant, the subsidiary engine cooling water of Air-cooled Unit (clammy unit is commonly referred to as out cold water) is used for the equipment such as the bearing of cooled electric generator, each subsidiary engine and oil cooler.The subsidiary engine cooling water has independently water circulation path.After having absorbed the heat that the motor feels hot produces, the subsidiary engine cooling water is realized the cooling of self by outdoor subsidiary engine cooling tower.That is to say, in the backwater path of subsidiary engine cooling water, the heat in the subsidiary engine cooling water is discharged into the atmosphere by the subsidiary engine cooling tower.Like this, produce following negative consequence to I haven't seen you for ages: one, the release along with the heat of subsidiary engine cooling water has steam and flies away everywhere in the plant area in power plant.Especially in the winter time the time, the steam that flies away is fallen on the outdoor electrical equipment of Air-Cooling Island below can condense into frost, thus the safe operation of electrical equipment is constituted a threat to; Its two, the heat in the subsidiary engine cooling water directly is discharged in atmosphere, cause the waste of the energy.
In addition, in the water circulation system in existing thermal power plant, acting will be used for repeating after condensate water collecting and heating.Condensate water has independently water circulation path.Be provided with precision processing device of condensation water in order to the foreign material of the various physics and chemistries in filtering condensate water in the water circulation path of condensate water.The filter core of the filter in the precision processing device is normally made by resin material, and this material must be asked the upper existence of serviceability temperature.Prescribe a time limit higher than the upper of serviceability temperature of this material when the water temperature of condensate water, the settling mode of available technology adopting is that the inlet valve of polisher is closed, and makes condensate water walk around polisher and directly flows through from bypass conduit.So just cause condensate system to lack purge segment in polisher, unfavorable to the safe operation of condensate system.
Summary of the invention
The cooling water heat recovering system and the heat recovery method that the purpose of this invention is to provide a kind of power plant in order to the heat recovery and utilization with the subsidiary engine cooling water backwater in subsidiary engine CWR road, and improve the operation conditions of condensate water circulation subsystem.
To achieve these goals, the invention provides a kind of cooling water heat recovering system of power plant, this cooling water heat recovering system comprises: have the subsidiary engine cooling water circulation subsystem on subsidiary engine CWR road, and have the condensate water circulation subsystem of condensate fine processing unit.Be provided with the First Heat Exchanger in the fluid that the heat of the fluid of cryogenic pipe can be passed to high temperature conduit in this cooling water heat recovering system, the cryogenic pipe of this First Heat Exchanger is connected in subsidiary engine CWR road, and the high temperature conduit of this First Heat Exchanger is connected on along the flow direction of condensate water in the condensate line in downstream of described condensate fine processing unit.
Preferably, also be provided with the second heat exchanger in the fluid that the heat of the fluid of high temperature conduit can be passed to cryogenic pipe in cooling water heat recovering system; Wherein, along the flow direction of condensate water, the high temperature conduit of the second heat exchanger is connected in the condensate line of upstream of condensate fine processing unit; Along the flow direction of subsidiary engine cooling water, the cryogenic pipe of the second heat exchanger is connected in the described subsidiary engine CWR road of cryogenic pipe upstream of First Heat Exchanger.
Preferably, condensate water circulation subsystem also has the condensate water low-pressure heater unit that is connected to condensate fine processing unit downstream along the flow direction of condensate water; Wherein, the high temperature conduit of First Heat Exchanger is connected in pipeline between the outlet of the outlet of described condensate fine processing unit and condensate water low-pressure heating unit.
Preferably, condensate water circulation subsystem also has the condensate pump unit, and along the flow direction of condensate water, the condensate pump unit is connected to the upstream of condensate fine processing unit; Wherein, the high temperature conduit of the second heat exchanger is connected in pipeline between the entrance of the outlet of condensate pump unit and condensate fine processing unit.
Preferably, condensate water low-pressure heater unit comprises a plurality of condensate water low-pressure heaters that are connected in series; Wherein, the high temperature conduit of First Heat Exchanger is connected between first condensate water low-pressure heater that arranges along the flow direction of condensate water and second condensate water low-pressure heater in a plurality of condensate water low-pressure heaters.
Preferably, First Heat Exchanger is absorption heat pump.
On the other hand, the present invention also provides a kind of heat recovery method of cooling water heat recovering system of power plant, cooling water heat recovering system comprises: have the subsidiary engine cooling water circulation subsystem on subsidiary engine CWR road, and have the condensate water circulation subsystem of condensate fine processing unit; Heat recovery method comprises: utilization can be passed to the heat of the fluid of cryogenic pipe the First Heat Exchanger in the fluid of high temperature conduit, the heat of the subsidiary engine cooling water backwater in subsidiary engine CWR road is passed in the condensate water to be heated in downstream of condensate fine processing unit.
Preferably, heat recovery method also comprises: the second heat exchanger in the fluid that the heat of the fluid of high temperature conduit can be passed to cryogenic pipe is set in cooling water heat recovering system, carries out cooling to utilize this subsidiary engine cooling water backwater before entering First Heat Exchanger at subsidiary engine cooling water backwater to the condensate water of condensate fine processing unit upstream.
Preferably, condensate water circulation subsystem also has the condensate water low-pressure heater unit that is connected to condensate fine processing unit downstream along the flow direction of condensate water; Wherein, the high temperature conduit of First Heat Exchanger is connected in pipeline between the outlet of the outlet of condensate fine processing unit and condensate water low-pressure heating unit.
Preferably, condensate water circulation subsystem also has the condensate pump unit, and along the flow direction of condensate water, the condensate pump unit is connected to the upstream of condensate fine processing unit; Wherein, the high temperature conduit of the second heat exchanger is connected in pipeline between the entrance of the outlet of condensate pump unit and condensate fine processing unit.
Preferably, condensate water low-pressure heater unit comprises a plurality of condensate water low-pressure heaters that are connected in series; Wherein, the high temperature conduit of First Heat Exchanger be connected in a plurality of condensate water low-pressure heaters along between first condensate water low-pressure heater of the flow direction of condensate water and second condensate water low-pressure heater.
Preferably, First Heat Exchanger is absorption heat pump.
By technique scheme, the present invention arranges the First Heat Exchanger of the fluid during the fluid from cryogenic pipe is passed to high temperature conduit with heat in the water circulation system in power plant.After using this First Heat Exchanger, the temperature of subsidiary engine cooling water backwater can be reduced on the one hand, thereby make subsidiary engine cooling water backwater possess the temperature conditions that enters next cycle period; On the other hand can heat-setting crystal processing unit the condensate water in downstream, thereby help to improve the efficiency of heating surface of condensate water low-pressure heating unit.So, can effectively recycle the heat in the backwater of subsidiary engine cooling water, reduce the loss of water circulation system; Simultaneously, can avoid subsidiary engine cooling tower discharged steam in the atmosphere, eliminate because of steam in accident potential that electrical equipment surface frosting causes.
In addition, the present invention also arranges in the water circulation system in power plant heat is passed to the second heat exchanger the fluid of cryogenic pipe from the fluid of high temperature conduit, before entering First Heat Exchanger at subsidiary engine cooling water backwater, utilize this subsidiary engine cooling water backwater to carry out cooling to the condensate water of condensate fine processing unit upstream.After using this second heat exchanger, can reduce the temperature of condensate water before condensate water flows into the condensate fine processing unit on the one hand, make the filter core of the filter in polisher always work in the lower state of temperature, thereby improve the running environment of filter core; Subsidiary engine cooling water backwater except having self-contained heat, has absorbed again the heat in the condensate water extraly in the second heat exchanger on the other hand.Therefore can be recovered to more heat from subsidiary engine cooling water backwater in First Heat Exchanger, improve the energy conversion efficiency of First Heat Exchanger.
Other features and advantages of the present invention will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and consists of the part of specification, is used from explanation the present invention with the following specific embodiment one, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the partial structurtes schematic diagram according to the cooling water heat recovering system in power plant of the present invention.
Description of reference numerals
1 second heat exchanger 2 First Heat Exchangers
The 3 condensate water water tanks 4 jellyfish pipe that condenses
56 condensate pump unit, subsidiary engine CWR roads
7 condensate water low-pressure heater unit 71 first condensate water low-pressure heaters
The 3rd condensate water low-pressure heater of 73 second condensate water low-pressure heaters 75
8 condensate fine processing unit 81 precision processing device of condensation waters
83 shunt valves
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
Need to prove, in the situation that do not do opposite explanation, the noun of locality " upstream " and " downstream " of using refer in a cycle period, is first " upstream " through the place along the flow direction subsidiary engine cooling water of subsidiary engine cooling water, after through locating to be " downstream "; In a cycle period, first be " upstream " through the place along the flow direction condensate water of condensate water, after through locating to be " downstream ".
With reference to figure 1, the invention provides a kind of cooling water heat recovering system of power plant.In this cooling water heat recovering system, comprise subsidiary engine cooling water circulation subsystem and condensate water circulation subsystem.Wherein, subsidiary engine cooling water circulation subsystem has subsidiary engine CWR road 5.After the equipment such as the bearing of subsidiary engine water quench generator, each subsidiary engine and oil cooler, concentrate to be back in subsidiary engine CWR road 5.Subsidiary engine cooling water backwater in subsidiary engine CWR road 5 reenters next cycle period through cooling.Condensate water circulation subsystem has condensate fine processing unit 8.After collecting condensate water in condensate water water tank 3 and being driven into by condensate pump unit 6 the jellyfish pipe 4 that condenses, carry out purified treatment and heat in condensate water low-pressure heater unit 7 in condensate fine processing unit 8.
According to embodiments of the invention, condensate fine processing unit 8 comprises precision processing device of condensation water 81, and is connected to the shunt valve 83 between the entrance and exit of precision processing device of condensation water 81.The filter core of the filter in precision processing device of condensation water 81 is the filter core of resin material, normally 65 ℃ of the upper limits of the operating temperature of this filter core.Under normal operation conditions, make shunt valve 83 be in blocking state by the valve of closing on shunt valve 83, condensate water flows through from precision processing device of condensation water 81.When the temperature of condensate water surpasses this ceiling temperature, make it be unlikely to impaired in order to protect filter core, to open valve shunt valve 83 is connected, condensate water is walked around precision processing device of condensation water 81 and is flowed away from shunt valve 83.
More specifically, according to embodiments of the invention, First Heat Exchanger 2 is set in cooling water heat recovering system.This First Heat Exchanger 2 can be passed to the heat of the fluid of cryogenic pipe in the fluid of high temperature conduit.According to embodiments of the invention, this First Heat Exchanger 2 is absorption heat pump.First Heat Exchanger 2 is realized the heat exchange reaction take lithium bromide as medium under the driving of steam.As shown in fig. 1, V1 interface and V2 interface are the high temperature conduit interfaces of First Heat Exchanger 2, and V3 interface and V4 interface are the driving steam pipework interfaces of First Heat Exchanger 2, and V5 interface and V6 interface are the cryogenic pipe interfaces of First Heat Exchanger 2.According to the operation principle of First Heat Exchanger in prior art, the fluid that temperature is lower flows into the cryogenic pipe of First Heat Exchanger 2 from the V5 interface, flow out from the V6 interface; The fluid that temperature is higher flows into the high temperature conduit of First Heat Exchanger 2 from the V1 interface, flow out from the V2 interface; Drive steam and flow into First Heat Exchanger 2 from the V3 interface, flow out from the V4 interface.Under the driving of steam, by the effect of lithium bromide medium, can realize the heat of the fluid of cryogenic pipe is passed in the fluid of high temperature conduit.
According to embodiments of the invention, the cryogenic pipe of First Heat Exchanger 2 is connected in subsidiary engine CWR road 5, and the high temperature conduit of this First Heat Exchanger 2 is connected in the pipeline that flows of condensate water.And, according to embodiments of the invention, the high temperature conduit of First Heat Exchanger 2 is connected in the pipeline in downstream of condensate fine processing unit 8, damages the filter core of the filter in precision processing device of condensation water 81 thereby the condensate water of having avoided absorbing heat flows through from condensate fine processing unit 8.Further, according to embodiments of the invention, along the flow direction of condensate water, be connected with condensate water low-pressure heater unit 7 in the downstream of condensate fine processing unit 8.The high temperature conduit of First Heat Exchanger 2 is connected in pipeline between the outlet of the outlet of condensate fine processing unit 8 and condensate water low-pressure heating unit 7.Like this, utilize the power conversion effect of First Heat Exchanger 2, can realize the heat in subsidiary engine cooling water backwater is delivered in the condensate water in downstream of condensate fine processing unit 8, thereby realize the recovery of the heat in subsidiary engine cooling water backwater.By this, the temperature of subsidiary engine cooling water backwater can be reduced, make subsidiary engine cooling water backwater possess the temperature conditions that enters next cycle period.Simultaneously, can also heat-setting crystal processing unit the condensate water in 8 downstreams, thereby improve condensing water temperature, improve thermodynamic system efficiency.
In more detail, according to embodiments of the invention, condensate water low-pressure heater unit 7 comprises a plurality of condensate water low-pressure heaters that are connected in series.As shown in fig. 1, along the flow direction of described condensate water, condensate water low-pressure heater unit 7 comprises first condensate water low-pressure heater 71, second condensate water low-pressure heater 73 and the 3rd condensate water low-pressure heater 75.Should be appreciated that, three condensate water low-pressure heaters herein enumerating only for the purpose of description, and are rather than exhaustive.According to embodiments of the invention, the high temperature conduit of First Heat Exchanger 2 is connected between first condensate water low-pressure heater 71 and second condensate water low-pressure heater 73.Because condensate water heats up gradually along its flow direction in condensate water low-pressure heater unit 7, therefore in condensate water low-pressure heater unit 7, the configuration relevant to temperature parameter of upstream can be relatively lower than the configuration of being correlated with temperature parameter of downstream pipeline.In other words, the high temperature conduit of First Heat Exchanger 2 is connected between first condensate water low-pressure heater 71 and second condensate water low-pressure heater 73, can reduce the parameter configuration of the high temperature conduit of First Heat Exchanger 2, thereby reduce the manufacturing cost of First Heat Exchanger 2.
Continuation according to embodiments of the invention, also is provided with the second heat exchanger 1 with reference to figure 1 in cooling water heat recovering system, this second heat exchanger 1 can be passed to the heat of the fluid of high temperature conduit in the fluid of cryogenic pipe.According to embodiments of the invention, the second heat exchanger 1 is arranged on the upstream of First Heat Exchanger 2.Particularly, along the flow direction of condensate water, the high temperature conduit of the second heat exchanger 1 is connected in the pipeline of condensate water of upstream of condensate fine processing unit 8; Along the flow direction of subsidiary engine cooling water, the cryogenic pipe of the second heat exchanger 1 is connected in the subsidiary engine CWR road 5 of cryogenic pipe upstream of First Heat Exchanger 2.That is to say, subsidiary engine cooling water backwater in flowing into First Heat Exchanger 2 before, first to flow through from the second heat exchanger 1.
More specifically, according to embodiments of the invention, be connected with condensate pump unit 6 in the upstream of condensate fine processing unit 8, this condensate pump unit 6 pumps into condensate water the jellyfish pipe 4 that condenses from condensate water water tank 3.And the high temperature conduit of the second heat exchanger 1 is connected in pipeline between the entrance of the outlet of condensate pump unit 6 and condensate fine processing unit 8.As shown in fig. 1, in the second heat exchanger 1, the lower subsidiary engine cooling water backwater generation heat exchange of temperature in the condensate water that the temperature in jellyfish pipe 4 of condensing is higher and subsidiary engine CWR road 5, the subsidiary engine cooling water absorbs heat in condensate water in the jellyfish pipe 4 that condenses as low-temperature receiver, thereby the temperature of the condensate water in the jellyfish pipe 4 that will condense reduces.
As previously mentioned; the filter core of precision processing device of condensation water 81 need to be worked in the temperature environment below 65 ℃; therefore, reduce by the temperature of the second heat exchanger 1 with the condensate water of the upstream of condensate fine processing unit 8, be conducive to the filter core of protect concrete polishing unit 81.And, when subsidiary engine cooling water backwater flows out, except having self-contained heat, absorbed extraly the heat of the condensate water in the jellyfish pipe 4 that condenses in the second heat exchanger 1 from the second heat exchanger 1.Like this, when these subsidiary engine cooling water backwater flow in First Heat Exchanger 2, carry more heat, thereby can be recovered to more heat from these subsidiary engine cooling water backwater, can improve by this energy conversion efficiency of First Heat Exchanger.
On the other hand, the present invention also provides a kind of heat recovery method of above-mentioned cooling water heat recovering system.The method comprises, utilizes First Heat Exchanger 2, the heat of the subsidiary engine cooling water backwater in subsidiary engine CWR road 5 is passed in the condensate water to be heated in downstream of condensate fine processing unit 8.
More specifically, according to embodiments of the invention, at first, the high temperature conduit of First Heat Exchanger 2 is connected in the pipeline in downstream of condensate fine processing unit 8.Secondly, the cryogenic pipe of First Heat Exchanger 2 is connected in subsidiary engine CWR road 5.Then, open First Heat Exchanger 2 heat in subsidiary engine cooling water backwater is passed to from the condensate water that condensate fine processing unit 8 flows out, to reclaim the heat in subsidiary engine cooling water backwater.
Method provided by the invention also comprises, the second heat exchanger 1 is set in cooling water heat recovering system, thereby before subsidiary engine cooling water backwater enters First Heat Exchanger 2, utilize this subsidiary engine cooling water backwater to carry out cooling to the condensate water of condensate fine processing unit 8 upstreams.
More specifically, according to embodiments of the invention, at first, the high temperature conduit of the second heat exchanger 1 is connected in the pipeline of upstream of condensate fine processing unit 8.Secondly, the cryogenic pipe of the second heat exchanger 1 is connected in the subsidiary engine CWR road 5 of upstream of cryogenic pipe of First Heat Exchanger 2.Thereby the temperature with this condensate water before condensate water enters condensate fine processing unit 8 reduces.
More detailed embodiment is described in preamble, repeats no more herein.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
Need to prove that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible combinations.
In addition, also can carry out any combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (12)

1. the cooling water heat recovering system in a power plant, this cooling water heat recovering system comprises: have the subsidiary engine cooling water circulation subsystem on subsidiary engine CWR road (5), and have the condensate water circulation subsystem of condensate fine processing unit (8); It is characterized in that, be provided with the First Heat Exchanger (2) in the fluid that the heat of the fluid of cryogenic pipe can be passed to high temperature conduit in this cooling water heat recovering system, the cryogenic pipe of this First Heat Exchanger (2) is connected in described subsidiary engine CWR road (5), the high temperature conduit of this First Heat Exchanger (2) along the series connection of the flow direction of condensate water in the condensate line in the downstream of described condensate fine processing unit (8).
2. the cooling water heat recovering system in power plant according to claim 1, is characterized in that, also is provided with the second heat exchanger (1) in the fluid that the heat of the fluid of high temperature conduit can be passed to cryogenic pipe in this cooling water heat recovering system;
Wherein, along the flow direction of condensate water, the high temperature conduit of described the second heat exchanger (1) is connected in the condensate line of upstream of described condensate fine processing unit (8); Along the flow direction of subsidiary engine cooling water, the cryogenic pipe of described the second heat exchanger (1) is connected in the described subsidiary engine CWR road (5) of cryogenic pipe upstream of described First Heat Exchanger (2).
3. the cooling water heat recovering system in power plant according to claim 1 and 2, it is characterized in that, described condensate water circulation subsystem also has the condensate water low-pressure heater unit (7) that is connected to described condensate fine processing unit (8) downstream along the flow direction of described condensate water;
Wherein, the high temperature conduit of described First Heat Exchanger (2) is connected in pipeline between the outlet of the outlet of described condensate fine processing unit (8) and described condensate water low-pressure heating unit (7).
4. the cooling water heat recovering system in power plant according to claim 2, it is characterized in that, described condensate water circulation subsystem also has condensate pump unit (6), along the flow direction of described condensate water, described condensate pump unit (6) is connected to the upstream of described condensate fine processing unit (8);
Wherein, the high temperature conduit of described the second heat exchanger (1) is connected in pipeline between the entrance of the outlet of described condensate pump unit (6) and described condensate fine processing unit (8).
5. the cooling water heat recovering system in power plant according to claim 3, is characterized in that, described condensate water low-pressure heater unit (7) comprises a plurality of condensate water low-pressure heaters that are connected in series;
Wherein, the high temperature conduit of described First Heat Exchanger (2) is connected between first condensate water low-pressure heater (71) and second condensate water low-pressure heater (73) of arranging along the flow direction of described condensate water in described a plurality of condensate water low-pressure heater.
6. the cooling water heat recovering system in power plant according to claim 1, is characterized in that, described First Heat Exchanger (2) is absorption heat pump.
7. the heat recovery method of the cooling water heat recovering system in a power plant, described cooling water heat recovering system comprises: have the subsidiary engine cooling water circulation subsystem on subsidiary engine CWR road (5), and have the condensate water circulation subsystem of condensate fine processing unit (8); It is characterized in that, described heat recovery method comprises: utilization can be passed to the heat of the fluid of cryogenic pipe the First Heat Exchanger (2) in the fluid of high temperature conduit, the heat of the subsidiary engine cooling water backwater in described subsidiary engine CWR road (5) is passed in the condensate water to be heated in downstream of described condensate fine processing unit (8).
8. the heat recovery method of the cooling water heat recovering system in power plant according to claim 7, it is characterized in that, this heat recovery method also comprises: the second heat exchanger (1) in the fluid that the heat of the fluid of high temperature conduit can be passed to cryogenic pipe is set in described cooling water heat recovering system, utilizes before this subsidiary engine cooling water backwater to carry out cooling to the condensate water of condensate fine processing unit (8) upstream to enter First Heat Exchanger (2) at subsidiary engine cooling water backwater.
9. the heat recovery method of the cooling water heat recovering system according to claim 7 or 8 described power plants, it is characterized in that, described condensate water circulation subsystem also has the condensate water low-pressure heater unit (7) that is connected to described condensate fine processing unit (8) downstream along the flow direction of described condensate water;
Wherein, the high temperature conduit of described First Heat Exchanger (2) is connected in pipeline between the outlet of the outlet of described condensate fine processing unit (8) and condensate water low-pressure heating unit (7).
10. the heat recovery method of the cooling water heat recovering system in power plant according to claim 8, it is characterized in that, described condensate water circulation subsystem also has condensate pump unit (6), along the flow direction of described condensate water, described condensate pump unit (6) is connected to the upstream of described condensate fine processing unit (8);
Wherein, the high temperature conduit of described the second heat exchanger (1) is connected in pipeline between the entrance of the outlet of described condensate pump unit (6) and condensate fine processing unit (8).
11. the heat recovery method of the cooling water heat recovering system in power plant according to claim 10 is characterized in that, described condensate water low-pressure heater unit (7) comprises a plurality of condensate water low-pressure heaters that are connected in series;
Wherein, the high temperature conduit of described First Heat Exchanger (2) be connected in described a plurality of condensate water low-pressure heater along between first condensate water low-pressure heater (71) and second condensate water low-pressure heater (73) of the flow direction of described condensate water.
12. the heat recovery method of the cooling water heat recovering system in power plant according to claim 7 is characterized in that, described First Heat Exchanger (2) is absorption heat pump.
CN201310025053.4A 2013-01-23 2013-01-23 Cooling water heat recovery system of power plant and heat recovery method Active CN103090358B (en)

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CN107631641A (en) * 2017-09-01 2018-01-26 中清源环保节能有限公司 A kind of coal-burning power plant's heat supply initial station low temperature reclaims subsidiary engine cooling water heat system

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CN201934152U (en) * 2010-12-29 2011-08-17 中国电力工程顾问集团公司 Indirect air cooling system for supercritical unit or ultra-supercritical unit
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