CN104564191A - Power plant afterheat recovery system - Google Patents
Power plant afterheat recovery system Download PDFInfo
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- CN104564191A CN104564191A CN201310521375.8A CN201310521375A CN104564191A CN 104564191 A CN104564191 A CN 104564191A CN 201310521375 A CN201310521375 A CN 201310521375A CN 104564191 A CN104564191 A CN 104564191A
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Abstract
The invention discloses a power plant afterheat recovery system, which comprises a condenser (1), a circulation cooling water loop, a heat pump (6), an afterheat water supply pipe (7), an afterheat water return pipe (8) and a water taking pipeline (12), wherein when the heat pump (6) is in a work state, a first switching valve (4) and a second switching valve (5) are closed, cooling water heated by a high-temperature region (II) enters the heat pump (6) through the afterheat water supply pipe (7) via the first end of the water taking pipeline (12), and the cooling water subjected to heat extraction enters the afterheat water return pipe (8) and returns to the high-temperature region (II) through the second end of the water taking pipeline (12). The power plant afterheat recovery system has the advantages that the structure characteristics of an afterheat recovery type condenser are utilized, so that the afterheat utilization efficiency is higher, the application range of recovered afterheat of the heat pump is enlarged, in addition, the afterheat utilization stability is ensured, and in addition, the requirements of the heat pump on afterheat water quantity under different heat loads can be met.
Description
Technical field
The present invention relates to heat recovery technology field, particularly relate to a kind of residual heat of electric power plant reclaiming system.
Background technique
Only have 45% left/right rotation to become electric energy in the fuel combustion gross calorific power of thermal power plant, and the heat energy of remaining more than 50% is called cold junction.In recent years, in order to energy-saving and emission-reduction, the waste heat extractive technique for cold junction is widely applied.As shown in Figure 1, waste heat extraction system of the prior art comprises vapour condenser 1 ', cooling water return pipe 2 ', recirculated cooling water water pipe 3 ', first switching valve 4 ', the second switching valve 5 ', remaining hot water suction booster 6 ', remaining hot water water pipe 7 ', return afterheat-water pipe 8 ', heat pump 9 ' and heat pump driving steam tube 10 '.Turbine discharge A ' enters the shell-side of vapour condenser 1 ', carries out heat exchange with the recirculated cooling water of vapour condenser 1 ' pipe side, releases the latent heat of vaporization, becomes main frame water of condensation B ', collect in hot well 12 '.Meanwhile, recirculated cooling water from cooling tower (not shown) enters the cooling tube bundle of vapour condenser 1 ' from recirculated cooling water water pipe 3 ', the heat of absorption is constantly taken away by the recirculated cooling water that vapour condenser 1 ' flows in restraining, and imports cooling water return pipe 2 '.From the recirculated cooling water that cooling water return pipe 2 ' is drawn, become remaining hot water to supply water, enter remaining hot water water pipe 7 ', and as the low grade residual heat thermal source of heat pump 9 ', after being extracted waste heat, water temperature reduces, become return afterheat-water, enter return afterheat-water pipe 8 ', then deliver to recirculated cooling water water pipe 3 ' through the pressurization of remaining hot water suction booster 6 ', steam turbine steam discharge is cooled to main frame water of condensation, circulates and so forth.In the process, the first switching valve 4 ' and the second switching valve 5 ' are all in open mode.
The former low-quality of power plant is drawn gas as heat pump driving steam C ', and enter heat pump and drive in steam tube 10 ', heat pump condenses into water D ' after driving steam to enter heat pump 9 ', collects in hot well 12 '.Heat user backwater 13 ', after heat pump 9 ' heats, supplies water 14 ' as heat user, and heat supply user uses.After heat pump 9 ' quits work, the first switching valve 4 ' and the second switching valve 5 ' are closed.
At present, waste heat extractive technique is all use on the circulating water line of vapour condenser outside, and available waste heat source has been complete mixed recirculated cooling water herein, is not the part of the highest temperature in vapour condenser, UTILIZATION OF VESIDUAL HEAT IN limited space.That is, utilize current waste heat extractive technique still to there is the waste of the energy greatly, utilization rate of waste heat is lower.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of residual heat of electric power plant reclaiming system, is extracted the waste heat thermal source of waste heat as heat pump of the high-temperature area of vapour condenser.
A kind of residual heat of electric power plant reclaiming system, comprising: comprise vapour condenser, circulating cooling water loop, the first switching valve, the second switching valve, heat pump, remaining hot water water pipe, return afterheat-water pipe, water intaking pipeline and for driving the heat pump driving source of described heat pump work; Described vapour condenser is residual heat recovery type vapour condenser, and the heat exchange area of described vapour condenser comprises high-temperature area and low-temperature region; Described circulating cooling water loop is connected with described low-temperature region, carries out exchange heat; Circulating cooling water loop comprises: cooling water return pipe, recirculated cooling water water pipe; The remaining hot water import of described heat pump connects described remaining hot water water pipe, and the remaining hot water outlet of described heat pump connects described return afterheat-water pipe; Described water intaking pipeline is connected with described high-temperature area, carries out exchange heat; The first end of described water intaking pipeline is connected with described remaining hot water water pipe with described cooling water return pipe respectively, and arranges described first switching valve in the first end of described water intaking pipeline and the path of described cooling water return pipe; Second end of described water intaking pipeline is connected with described return afterheat-water pipe with described recirculated cooling water water pipe respectively, and arranges described second switching valve in the second end of described water intaking pipeline and the path of described recirculated cooling water water pipe; Wherein, under described heat pump working state, close described first switching valve and the second switching valve, the cooling water heated by described high-temperature area is by the first end of described water intaking pipeline, enter described heat pump through described remaining hot water water pipe, as the waste heat thermal source of described heat pump, be extracted the cooling water after heat and enter described return afterheat-water pipe, described high-temperature area is got back to, as the medium of described vapour condenser cooling steam turbine exhaust by the second end of described water intaking pipeline.
According to one embodiment of present invention, further, also comprise: the 3rd switching valve and the 4th switching valve; Described 3rd switching valve is arranged on described remaining hot water water pipe, and described 4th switching valve is arranged on described return afterheat-water pipe; Wherein, under described heat pump working state, described 3rd switching valve and the 4th switching valve are all in open mode.
According to one embodiment of present invention, further, under the out-of-work state of described heat pump, described first switching valve and the second switching valve are in open mode, and described 3rd switching valve and the 4th switching valve are in closed condition; Cooling tower is connected with described circulating cooling water loop, from the cooling water of cooling tower respectively by described recirculated cooling water water pipe and described water intaking pipeline, enter high-temperature area and the low-temperature region of described vapour condenser, as the medium of described vapour condenser cooling steam turbine exhaust; After described vapour condenser heat exchange, the cooling water in described water intaking pipeline enters described cooling water return pipe by described first switching valve, confluxes, return cooling tower with the cooling water after heat exchange in described cooling water return pipe.
According to one embodiment of present invention, further, described heat pump driving source comprises: heat pump drives steam tube and heat pump to drive steam condensation water pipe; Power plant draws gas and drives steam tube to enter the driving steam inlet of heat pump as driving steam via described heat pump, converts water of condensation to, by the driving steam condensation water out of described heat pump, enter described heat pump and drive steam condensation water pipe after releasing energy.
According to one embodiment of present invention, further, also comprise: remaining hot water suction booster; Described remaining hot water suction booster is arranged in described return afterheat-water pipe.
According to one embodiment of present invention, further, described heat pump is become by multiple stage dry platform absorption type heat pump assembly; Described dry platform absorption heat pump machine is lithium bromide absorption type heat pump machine.
Residual heat of electric power plant reclaiming system of the present invention, make use of the structural characteristics of residual heat recovery type vapour condenser, concentrate the waste heat being extracted the high-temperature part of recirculated cooling water, make utilization rate of waste heat higher, expand the Applicable scope of heat pump recovery waste heat, and ensure that the stability of UTILIZATION OF VESIDUAL HEAT IN, and under different heat load can be adapted to heat pump to the demand of the waste heat water yield.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is waste heat extraction system principle schematic of the prior art;
Fig. 2 is the schematic diagram of an embodiment according to residual heat of electric power plant reclaiming system of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with figure and embodiment, many-sided description is carried out to technological scheme of the present invention.
As shown in Figure 2, residual heat of electric power plant reclaiming system, comprising: comprise vapour condenser 1, circulating cooling water loop, the first switching valve 4, second switching valve 5, heat pump 6, remaining hot water water pipe 7, return afterheat-water pipe 8, water intaking pipeline 12 and the heat pump driving source for driving heat pump 6 to work.
Vapour condenser 1 is residual heat recovery type vapour condenser, and vapour condenser 1 is divided into residual heat heat-exchanging device (high-temperature area II) and main condensing means (low-temperature region I).Wherein residual heat heat-exchanging device regional temperature is higher, is set as high-temperature area II; Main condensing means regional temperature is lower, is set as low-temperature region I.Circulating cooling water loop is connected with low-temperature region I, carries out exchange heat.Circulating cooling water loop comprises: cooling water return pipe 2, recirculated cooling water water pipe 3.
The remaining hot water import of heat pump 6 connects remaining hot water water pipe 7, and the remaining hot water outlet of heat pump 6 connects return afterheat-water pipe 8.Water intaking pipeline 12 is connected with high-temperature area II, carries out exchange heat.The first end of water intaking pipeline 12 is connected with remaining hot water water pipe 7 with cooling water return pipe 2 respectively, and arranges the first switching valve 4 in the water intaking first end of pipeline 12 and the path of cooling water return pipe 2.Second end of water intaking pipeline 12 is connected with return afterheat-water pipe 8 with recirculated cooling water water pipe 3 respectively, and arranges the second switching valve 5 in water intaking the second end of pipeline 12 and the path of recirculated cooling water water pipe 3.
When heat pump 6 works, the first switching valve 4 and the second switching valve 5 are all in closed condition.Steam turbine exhaust A enters the shell-side of vapour condenser 1, carries out heat exchange, release the latent heat of vaporization, become main frame water of condensation B, collect in hot well 15 with the recirculated cooling water of vapour condenser 1 pipe side.Meanwhile, the recirculated cooling water from cooling tower (not shown) enters the low-temperature region I cooling tube bundle of vapour condenser 1 from recirculated cooling water water pipe 3, and in cooling tube bundle, the heat of absorption is constantly taken away by the recirculated cooling water of flowing.
Because the first switching valve 4 and the second switching valve are all in closed condition, therefore, the recirculated cooling water of high-temperature area II, via the first end of water intaking pipeline 12, enters remaining hot water water pipe 7, as the waste heat thermal source of heat pump 6, after being extracted waste heat, water temperature reduces, and being extracted the recirculated cooling water after heat becomes return afterheat-water, enter return afterheat-water pipe 8, pressurize through remaining hot water suction booster 6 again, be delivered to the high-temperature area II of vapour condenser 1 by water intaking pipeline 12, be used as the medium of cooling steam turbine exhaust.Heat user backwater E through heat pump 6 heat after, for heat user water supply F for produce or live.
According to one embodiment of present invention, the 3rd switching valve 13 is arranged on remaining hot water water pipe 7, and the 4th switching valve 14 is arranged on return afterheat-water pipe 8.Under heat pump 6 working state, the 3rd switching valve 13 and the 4th switching valve 14 are all in open mode.
Under the out-of-work state of heat pump 6, the first switching valve 4 and the second switching valve 5 are in open mode, and the 3rd switching valve 13 and the 4th switching valve 14 are in closed condition.Cooling tower is connected with circulating cooling water loop, from the cooling water of cooling tower respectively by recirculated cooling water water pipe 3 and water intaking pipeline 12, enters high-temperature area II and the low-temperature region I of vapour condenser 1, cools the medium of steam turbine exhaust as vapour condenser 1.
After vapour condenser 1 heat exchange, the cooling water in water intaking pipeline 12 enters cooling water return pipe 2 by the first switching valve 4, confluxes, return cooling tower with the cooling water after heat exchange in cooling water return pipe 2.
From the recirculated cooling water of cooling tower, a part of recirculated cooling water enters water intaking pipeline 12 by the second switching valve 5, and remaining recirculated cooling water enters recirculated cooling water water pipe 3, and enters vapour condenser 1 together, the common medium being used as the exhaust of cooling steam turbine.
Complete mixed recirculated cooling water for waste heat source in prior art, it is not the part of the highest temperature in vapour condenser, the problem of UTILIZATION OF VESIDUAL HEAT IN limited space, residual heat of electric power plant reclaiming system of the present invention, utilize residual heat recovery type vapour condenser, heat pump 6 is caused from the recirculated cooling water of the high-temperature area II of vapour condenser 1, after heat pump 6 extracts heat, the circulating cooling coolant-temperature gage of this part reduces, again through remaining hot water suction booster 9 supercharging, be delivered to the entrance of the high-temperature area II of recirculated cooling water in vapour condenser 1, then enter vapour condenser 1 and restrain interior cooling steam turbine steam discharge, and so forth, form circulation.
According to one embodiment of present invention, heat pump driving source comprises: heat pump drives steam tube 10 and heat pump to drive steam condensation water pipe 11.Power plant draw gas drive steam tube 10 to enter heat pump 6 via heat pump driving steam inlet as driving steam, convert water of condensation to after releasing energy, by the driving steam condensation water out of heat pump 6, enter heat pump and drive steam condensation water pipe 11.
The former low-quality C of drawing gas of power plant drives steam tube 10 to enter the driving steam inlet of heat pump 6 via heat pump, as driving steam, convert water of condensation D to after releasing energy, by the driving steam condensation water out of heat pump 6, enter heat pump and drive steam condensation water pipe 11, in final remittance hot well 15.
According to one embodiment of present invention, remaining hot water suction booster 9 is arranged in return afterheat-water pipe 8, to compensate the drag losses in closed circuit, makes the circulation that remaining hot water can be stable in pipeline.
According to one embodiment of present invention, heat pump 6 is become by multiple stage absorption type heat pump assembly.Absorption heat pump machine is lithium bromide absorption type heat pump machine.
" first ", " second " in the present invention etc. are distinguished on describing, not other special implication.
Residual heat of electric power plant reclaiming system of the present invention, can according to the working state of heat pump, switched flexibly by above-mentioned each switching valve, therefore heat pump extracts between waste heat and recirculated cooling water and can switch flexibly, ensure that the stability of unit operation, and under different heat load can be adapted to heat pump to the demand of the waste heat water yield.
In the various embodiments described above, vapour condenser 1 is not only confined to plant condenser, also can be any vapour condenser utilized in the industrial field of demand that has surplus heat.
Residual heat of electric power plant reclaiming system of the present invention, set up a water intaking pipeline, and water intaking pipeline is connected with the high-temperature area of recirculated cooling water, again the first end of water intaking pipeline is connected with cooling water return pipe by the first switching valve, second end of water intaking pipeline is connected with recirculated cooling water water pipe by the second switching valve, also the first end of water intaking pipeline is connected with remaining hot water water pipe, second end of water intaking pipeline is connected with return afterheat-water pipe, thus the recirculated cooling water of relatively-high temperature can be made to cause heat pump, extract after heat through heat pump, the circulating cooling coolant-temperature gage of this part reduces, again through the supercharging of remaining hot water suction booster, be delivered to the entrance in the relatively-high temperature region of recirculated cooling water in vapour condenser, then enter cooling steam turbine steam discharge in bank of condenser pipes, and so forth, form circulation.
Present invention utilizes the structural characteristics of residual heat recovery type vapour condenser, concentrate the waste heat being extracted the high-temperature part of recirculated cooling water, that is, the waste heat source that heat pump utilizes is the high temperature circulation cooling water backwater before mixing, even if when thermal power generation unit back pressure is lower, the water temperature of this component loops cooling water is also higher, thus make utilization rate of waste heat higher, and avoid the restriction that heat pump utilizes circulating cooling water afterheat to affect by factors such as unit operation back pressures, expand the Applicable scope of heat pump recovery waste heat, and ensure that the stability of UTILIZATION OF VESIDUAL HEAT IN.
With adopt mixed cooling water return as compared with waste heat source in prior art, the invention solves the problem of UTILIZATION OF VESIDUAL HEAT IN limited space in prior art.
In addition, at least also there is following advantage in the preferred technical solution of the present invention:
Because the present invention has set up the 3rd switching valve on remaining hot water water pipe, return afterheat-water pipe has been set up the 4th switching valve, with existing first switching valve together with the second switching valve, working state according to heat pump switches flexibly, therefore heat pump extracts between waste heat and recirculated cooling water and can switch flexibly, ensure that the stability of unit operation, and under different heat load can be adapted to heat pump to the demand of the waste heat water yield.
Claims (6)
1. a residual heat of electric power plant reclaiming system, is characterized in that, comprising:
Comprise vapour condenser (1), circulating cooling water loop, the first switching valve (4), the second switching valve (5), heat pump (6), remaining hot water water pipe (7), return afterheat-water pipe (8), water intaking pipeline (12) and the heat pump driving source for driving described heat pump (6) to work;
Described vapour condenser (1) is residual heat recovery type vapour condenser, and the heat exchange area of described vapour condenser (1) comprises high-temperature area (II) and low-temperature region (I); Described circulating cooling water loop is connected with described low-temperature region (I), carries out exchange heat; Circulating cooling water loop comprises: cooling water return pipe (2), recirculated cooling water water pipe (3); The remaining hot water import of described heat pump (6) connects described remaining hot water water pipe (7), and the remaining hot water outlet of described heat pump (6) connects described return afterheat-water pipe (8);
Described water intaking pipeline (12) is connected with described high-temperature area (II), carries out exchange heat; The first end of described water intaking pipeline (12) is connected with described remaining hot water water pipe (7) with described cooling water return pipe (2) respectively, and arranges described first switching valve (4) in the first end of described water intaking pipeline (12) and the path of described cooling water return pipe (2); Second end of described water intaking pipeline (12) is connected with described return afterheat-water pipe (8) with described recirculated cooling water water pipe (3) respectively, and arranges described second switching valve (5) in the second end of described water intaking pipeline (12) and the path of described recirculated cooling water water pipe (3);
Wherein, under described heat pump (6) working state, close described first switching valve (4) and the second switching valve (5), the cooling water heated by described high-temperature area (II) is by the first end of described water intaking pipeline (12), described heat pump (6) is entered through described remaining hot water water pipe (7), as the waste heat thermal source of described heat pump (6), be extracted the cooling water after heat and enter described return afterheat-water pipe (8), described high-temperature area (II) is got back to by the second end of described water intaking pipeline (12), as the medium of described vapour condenser (1) cooling steam turbine exhaust.
2. the system as claimed in claim 1, is characterized in that:
Also comprise: the 3rd switching valve (13) and the 4th switching valve (14);
Described 3rd switching valve (13) is arranged on described remaining hot water water pipe (7), and described 4th switching valve (14) is arranged on described return afterheat-water pipe (8);
Wherein, under described heat pump (6) working state, described 3rd switching valve (13) and the 4th switching valve (14) are all in open mode.
3. system as claimed in claim 2, is characterized in that:
Under described heat pump (6) out-of-work state, described first switching valve (4) and the second switching valve (5) are in open mode, and described 3rd switching valve (13) and the 4th switching valve (14) are in closed condition;
Cooling tower is connected with described circulating cooling water loop, low-temperature region (I) and the high-temperature area (II) of described vapour condenser (1) is entered respectively by described recirculated cooling water water pipe (3) and described water intaking pipeline (12), as the medium of described vapour condenser (1) cooling steam turbine exhaust from the cooling water of cooling tower; After described vapour condenser (1) heat exchange, cooling water in described water intaking pipeline (12) enters described cooling water return pipe (2) by described first switching valve (4), conflux with the cooling water after heat exchange in described cooling water return pipe (2), return cooling tower.
4. system as claimed in claim 3, is characterized in that:
Described heat pump driving source comprises: heat pump drives steam tube (10) and heat pump to drive steam condensation water pipe (11); Power plant draws gas and drives steam tube (10) to enter the driving steam inlet of heat pump (6) as driving steam via described heat pump, water of condensation is converted to after releasing energy, by the driving steam condensation water out of described heat pump (6), enter described heat pump and drive steam condensation water pipe (11).
5. the system as claimed in claim 1, is characterized in that:
Also comprise: remaining hot water suction booster (9);
Described remaining hot water suction booster (9) is arranged in described return afterheat-water pipe (8).
6. the system as claimed in claim 1, is characterized in that:
Described heat pump (6) is become by multiple stage absorption type heat pump assembly;
Described absorption heat pump machine is lithium bromide absorption type heat pump machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521375.8A CN104564191A (en) | 2013-10-29 | 2013-10-29 | Power plant afterheat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521375.8A CN104564191A (en) | 2013-10-29 | 2013-10-29 | Power plant afterheat recovery system |
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| CN104564191A true CN104564191A (en) | 2015-04-29 |
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| CN201310521375.8A Pending CN104564191A (en) | 2013-10-29 | 2013-10-29 | Power plant afterheat recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519241A (en) * | 2017-09-19 | 2019-03-26 | 株式会社东芝 | Heat generating system |
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| US20110056227A1 (en) * | 2009-09-08 | 2011-03-10 | Hoon Jung | Heat recovery system of plant using heat pump |
| CN202202905U (en) * | 2011-07-20 | 2012-04-25 | 李德军 | Totally closed circulating water system capable of recovering latent heat of condensing generation unit by using air cooler |
| CN202209817U (en) * | 2011-08-31 | 2012-05-02 | 北京中科华誉能源技术发展有限责任公司 | District cooling, heating and power combined energy system based on absorption heat exchange |
| CN103216284A (en) * | 2013-04-28 | 2013-07-24 | 烟台龙源电力技术股份有限公司 | Separate-water-taking waste heat extraction system |
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2013
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58140409A (en) * | 1982-02-17 | 1983-08-20 | Hitachi Ltd | Circulation system of steam |
| US20110056227A1 (en) * | 2009-09-08 | 2011-03-10 | Hoon Jung | Heat recovery system of plant using heat pump |
| CN202202905U (en) * | 2011-07-20 | 2012-04-25 | 李德军 | Totally closed circulating water system capable of recovering latent heat of condensing generation unit by using air cooler |
| CN202209817U (en) * | 2011-08-31 | 2012-05-02 | 北京中科华誉能源技术发展有限责任公司 | District cooling, heating and power combined energy system based on absorption heat exchange |
| CN103216284A (en) * | 2013-04-28 | 2013-07-24 | 烟台龙源电力技术股份有限公司 | Separate-water-taking waste heat extraction system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109519241A (en) * | 2017-09-19 | 2019-03-26 | 株式会社东芝 | Heat generating system |
| US11018289B2 (en) | 2017-09-19 | 2021-05-25 | Kabushiki Kaisha Toshiba | Thermoelectric generation system |
| CN109519241B (en) * | 2017-09-19 | 2022-03-22 | 株式会社东芝 | Thermal power generation system |
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Application publication date: 20150429 |