CN102297467A - Centralized heat supply system for low-temperature backwater - Google Patents
Centralized heat supply system for low-temperature backwater Download PDFInfo
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- CN102297467A CN102297467A CN2011102405935A CN201110240593A CN102297467A CN 102297467 A CN102297467 A CN 102297467A CN 2011102405935 A CN2011102405935 A CN 2011102405935A CN 201110240593 A CN201110240593 A CN 201110240593A CN 102297467 A CN102297467 A CN 102297467A
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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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B30/12—Hot water central heating systems using heat pumps
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Abstract
The invention discloses a centralized heat supply system for low-temperature backwater, which belongs to the field of centralized heat supply. The invention has the technical scheme that heat pump type heat exchange units are respectively arranged in each heating station of a heat supply network; backwater temperature of hot water of a primary network is reduced; low-temperature backwater of the primary network is introduced to a condenser first; and exhaust steam of a steam turbine is used for heating. The centralized heat supply system is mainly characterized in that: firstly, the heat pump type heat exchange units are arranged in the heating stations of the heat supply network; compared with the conventional heat supply model, the centralized heat supply system can be used for further reducing the backwater temperature of the primary network, so that the temperature difference between supply water and backwater of the hot water of the primary network is further increased, the conveying capability of the heat supply network is improved and low-temperature backwater provides possibility for recovering exhaust steam waste heat of the steam turbine of a power plant; and secondly, backwater of the primary network is primarily heated in the power plant by using the condenser, thus the exhaust steam waste heat of the steam turbine is effectively recovered and the heat supply capability of the power plant is improved.
Description
Technical field
The invention belongs to the central heating field, relate to a kind of central heating system of low temperature backwater.
Background technology
Continuous development along with city size, the concentrated supply of heating in the city area constantly increases, brought the problem of two aspects: the one, the scarce capacity of central heating thermal source, newly-built large-scale thermal source investment is high, the construction period is long, and is subjected to the strong restriction of environmental carrying capacity, some local pell-mell development small scall coal-fired boiler rooms, bring serious pollution to atmosphere, some local pell-mell development gas-heating even electric heatings when bringing heating expensive, have caused comprehensive anxiety of combustion gas, electric power; The 2nd, the high-temperature-hot-water that thermal source produces often needs could arrive terminal temperature difference through the conveying of longer distance, the once net of concentrated supply of heating in the city at present supplies, return water temperature is generally 120～60 ℃, owing to be subjected to of the restriction of secondary net with heat request, the heat exchanger of return water temperature utilization routine can't reduce again, therefore the conveying capacity of hot water is very big, and problem shows especially day by day to make that heat range of heat is little, the pipeline investment is big and the water pump operation power consumption is big etc.
In addition, the thermal power plant is in power generation process, and the residual heat resources in the exhaust steam in steam turbine are not utilized effectively, and is recycled water and takes cooling tower heat radiation to or directly enter the cooling of air cooling island, and heat is directly arranged to atmosphere, slatterning in vain.If can utilize this part exhaust steam in steam turbine heat in thermal power plant, be equivalent to enlarge the heat capacity of thermal source, but still effectively do not utilized at present because its heat energy quality is low not increasing power plant's capacity, not increasing under the situation of local discharging.
Summary of the invention
At the problems referred to above, the present invention proposes and a kind ofly can effectively reduce the heat supply network return water temperature, and in power plant, utilize the exhaust steam in steam turbine waste heat to heat once the central heating mode of net hot water, not only can alleviate the problem of central heating thermal source scarce capacity, can also significantly improve the conveying capacity of heat supply network, reduce conveying energy consumption.
Technical scheme of the present invention is that the heat pump type heat exchanging unit (patent No.: ZL200810101064.5) is set in each thermal substation of heat supply network, after the once net of high temperature supplies water and sends power plant, enter into described heat pump type heat exchanging unit, the hot user of heating secondary net hot water supply, realize once the cooling of net hot water simultaneously, and well below the return water temperature of secondary net, this may for utilizing the power plant steam turbine exhaust steam residual heat to provide; After the once net backwater of low temperature is got back to power plant, at first enter in the condenser, heated by exhaust steam in steam turbine, enter in the steam water heat exchanger again after being heated to uniform temperature, further heated by high-temperature steam from the extracted steam from turbine pipeline, high temperature after the heating once net hot water is sent power plant again as once netting to supply water, and finishes circulation.
Described condenser is the existing electricity generation system condenser of power plant, or first condenser of setting up, and when setting up first condenser, first condenser is in parallel with existing electricity generation system condenser of power plant or air cooling island.
Each thermal substation for heat supply network, the heat pump type heat exchanging unit can all be set, also the heat pump type heat exchanging unit can be set partly, remainder still adopts conventional water-water heat exchanger, at this moment, once the return water temperature of net can reduce with the raising that heat pump type heat exchanging unit ratio is set.
System of the present invention not only is adapted to exhaust steam in steam turbine water-cooled pattern, and promptly the exhaust steam heat takes the cooling tower heat radiation to by recirculated water, also is adapted to exhaust steam air cooling pattern, i.e. exhaust steam directly enters in the air cooling island cools off.
For the electricity generation system of exhaust steam in steam turbine employing water-cooled pattern, it is in parallel with original electricity generation system condenser to set up first condenser, is specifically designed to heat once net backwater, can not influence the original electricity generation system of power plant; Also can switch, utilize the existing electricity generation system condenser of power plant to heat once net backwater by system.
For the electricity generation system of exhaust steam in steam turbine employing air cooling pattern, it is in parallel with the air cooling island to set up first condenser, is used to heat once net backwater.
When exhaust steam residual heat can not all reclaim, the exhaust steam heat of remainder still can take the cooling tower heat radiation to or directly enter in the air cooling island and cool off by recirculated water, can not cause adverse effect to original electricity generation system.
Beneficial effect of the present invention is embodied in two aspects: first, in each thermal substation of heat supply network, the heat pump type heat exchanging unit is set, more conventional central heating mode, further reduced once net return water temperature, make that once confession, the backwater temperature difference of net hot water further increase, improved the heat supply network conveying capacity, and the once net backwater of low temperature provides possibility for reclaiming the power plant steam turbine exhaust steam residual heat; The second, in power plant, utilize once net backwater of the elementary heating of condenser, effectively reclaimed the exhaust steam in steam turbine waste heat, the heat capacity of power plant is improved.
Description of drawings
Fig. 1 is provided with first condenser when being used for exhaust steam water-cooled pattern for system of the present invention and heats the once schematic flow sheet of net backwater;
Fig. 2 is provided with first condenser when being used for exhaust steam air cooling pattern for system of the present invention and heats the once schematic flow sheet of net backwater;
Fig. 3 is provided with the schematic flow sheet of heat pump type heat exchanging unit for system of the present invention part in the heat supply network thermal substation;
When being used for exhaust steam water-cooled pattern for system of the present invention, Fig. 4 utilize existing electricity generation system condenser to heat the once schematic flow sheet of net backwater;
Number in the figure: 1-a, first condenser; 1-b, electricity generation system condenser; 2, steam water heat exchanger; 3, heat pump type heat exchanging unit; 4, water-water heat exchanger; 5, steam turbine; 6, cooling tower; 7, air cooling island.
The specific embodiment
The following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Embodiment 1: as shown in Figure 1, exhaust steam in steam turbine adopts the water-cooled pattern in the power plant, the exhaust steam outlet of steam turbine links to each other with electricity generation system condenser 1-b, the bleed steam pipework of steam turbine links to each other with steam water heat exchanger 2, system of the present invention all is provided with heat pump type heat exchanging unit 3 in each thermal substation of heat supply network (patent No.: ZL200810101064.5), it is in parallel with the existing electricity generation system condenser 1-b of power plant that the first condenser 1-a is set in power plant.
After the once net of high temperature supplies water and sends power plant, enter into above-mentioned heat pump type heat exchanging unit 3, the hot user of heating secondary net hot water supply realizes once netting hot water backwater's cooling, after the once net backwater of low temperature returns power plant simultaneously, at first enter among the first condenser 1-a, by the exhaust steam of steam turbine 5 heating, enter again in the steam water heat exchanger 2, continued heating by high-temperature steam from steam turbine 5 bleed steam pipeworks, high temperature after the heating once net hot water is sent power plant as once netting to supply water, and finishes circulation.
When the exhaust steam residual heat of steam turbine 5 can't all reclaim, still can the exhaust steam residual heat of remainder be taken in the cooling tower 6 and emit by the recirculated water among the electricity generation system condenser 1-b, therefore, can not cause adverse effect to the original electricity generation system of power plant.
Embodiment 2: as shown in Figure 2, exhaust steam in steam turbine adopts the air cooling pattern in the power plant, the exhaust steam outlet of steam turbine links to each other with air cooling island 7, and system of the present invention all is provided with heat pump type heat exchanging unit 3 in each thermal substation of heat supply network, and it is in parallel with power plant air cooling island 7 that the first condenser 1-a is set in power plant.Compare with embodiment 1, the air cooling pattern has been adopted in the power plant steam turbine exhaust steam of present embodiment, and other is identical with embodiment 1.
When the exhaust steam residual heat of steam turbine 5 can't all reclaim, the exhaust steam of remainder still can directly enter into 7 coolings of power plant air cooling island, therefore, can not cause adverse effect to the original electricity generation system of power plant.
Embodiment 3: as shown in Figure 3, part is provided with heat pump type heat exchanging unit 3 in each thermal substation of heat supply network, and another part is provided with conventional water-water heat exchanger 4, and it is in parallel with the existing electricity generation system condenser 1-b of power plant that the first condenser 1-a is set in power plant.The difference of comparing with embodiment 1 is, part is provided with conventional water-water heat exchanger 4 in the heat supply network thermal substation of present embodiment, can't making once, the net backwater is cooled to the return water temperature that is lower than the secondary net, this part high temperature returns in the power plant after once the net backwater will mix with the low-temperature primary net backwater through 3 coolings of heat pump type heat exchanging unit again and heats, therefore, the ratio that heat pump type heat exchanging unit 3 is set in the heat supply network thermal substation is high more, once Wang return water temperature is just low more, just helps reclaiming the exhaust steam residual heat of steam turbine 5 more.
Embodiment 4: as shown in Figure 4, exhaust steam in steam turbine adopts the water-cooled pattern in the power plant, the exhaust steam outlet of steam turbine links to each other with electricity generation system condenser 1-b, the bleed steam pipework of steam turbine links to each other with steam water heat exchanger 2, in each thermal substation of heat supply network, heat pump type heat exchanging unit 3 is set all, after the once net of high temperature supplies water and sends power plant, enter into above-mentioned heat pump type heat exchanging unit 3, the hot user of heating secondary net hot water supply, realize once netting hot water backwater's cooling simultaneously, and well below the return water temperature of secondary net, after the once net backwater of low temperature returns power plant, at first enter among the electricity generation system condenser 1-b, by the exhaust steam of steam turbine 5 heating, enter again in the steam water heat exchanger 2, continued heating by high-temperature steam from steam turbine 5 bleed steam pipeworks, high temperature after the heating once net hot water is sent power plant as once netting to supply water, and finishes circulation.
Compare with embodiment 1, present embodiment is not provided with the first condenser 1-a in addition in power plant, but switch by system, the once net backwater of low temperature is incorporated among the existing electricity generation system condenser 1-b of power plant, by the exhaust steam of steam turbine 5 heating, when exhaust steam residual heat can't all reclaim, can pass through valve regulated, make remainder exhaust steam heat take discharging in the cooling tower 6 to, can not influence generating safety by recirculated water.
The above; only for the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (8)
1. the central heating system of a low temperature backwater, it is characterized in that: heat pump type heat exchanging unit (3) is set in the thermal substation of heat supply network, after once net supplies water and sends power plant, enter into described heat pump type heat exchanging unit (3), the hot user of heating secondary net hot water supply, realize once the cooling of net hot water simultaneously, after once the net backwater is got back to power plant, at first enter in the condenser, heated by the exhaust steam of steam turbine (5), enter in the steam water heat exchanger (2) again, further heated by the steam from steam turbine (5) bleed steam pipework, power plant is sent as once netting to supply water in the heating back;
Described condenser is the existing electricity generation system condenser of power plant (1-b), or first condenser of setting up (1-a).
2. the central heating system of low temperature backwater according to claim 1 is characterized in that: heat pump type heat exchanging unit (3) all is set in each thermal substation of heat supply network.
3. the central heating system of low temperature backwater according to claim 1 is characterized in that: part is provided with heat pump type heat exchanging unit (3) in each thermal substation of heat supply network, and remainder still adopts conventional water-water heat exchanger (4).
4. the central heating system of low temperature backwater according to claim 1, it is characterized in that: exhaust steam in steam turbine is the water-cooled pattern, adopt described first condenser of setting up (1-a) to heat once net backwater, first condenser (1-a) is in parallel with original electricity generation system condenser (1-b).
5. the central heating system of low temperature backwater according to claim 1 is characterized in that: exhaust steam in steam turbine is the water-cooled pattern, can switch by system in the power plant, utilizes the existing electricity generation system condenser of power plant (1-b) to heat once net backwater.
6. according to the central heating system of claim 4 or 5 described low temperature backwater, it is characterized in that: when exhaust steam residual heat can not all reclaim, the exhaust steam heat of remainder took in the cooling tower (6) by recirculated water and scatters and disappears.
7. the central heating system of low temperature backwater according to claim 1, it is characterized in that: exhaust steam in steam turbine is the air cooling pattern, adopt described first condenser of setting up (1-a) to heat once net backwater, first condenser (1-a) is in parallel with power plant existing air cooling island (7).
8. the central heating system of low temperature backwater according to claim 7 is characterized in that: when exhaust steam residual heat can not all reclaim, the exhaust steam of remainder directly entered cooling in the air cooling island (7).
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| CN2011102405935A CN102297467A (en) | 2011-08-19 | 2011-08-19 | Centralized heat supply system for low-temperature backwater |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453567A (en) * | 2013-09-15 | 2013-12-18 | 张茂勇 | Low vacuum ejector heat pump composite waste-heat heating supply system based on huge temperature-difference heat supply network |
| CN103759316A (en) * | 2013-12-31 | 2014-04-30 | 中国能源建设集团山西省电力勘测设计院 | Cascade heating system for heat supply network circulation water |
| CN105276653A (en) * | 2015-11-25 | 2016-01-27 | 北京市煤气热力工程设计院有限公司 | Heat exchange unit and method for integrating absorption heat pump and electric heat pump |
| CN108506995A (en) * | 2018-02-08 | 2018-09-07 | 中国科学院上海应用物理研究所 | Passive list tank thermal storage heating system |
| CN108800275A (en) * | 2018-07-16 | 2018-11-13 | 河南理工大学 | A kind of big temperature-difference central heating system and working method using residual heat of electric power plant |
| CN108870507A (en) * | 2018-04-03 | 2018-11-23 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| 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 |
| CN109539358A (en) * | 2018-12-20 | 2019-03-29 | 普瑞森能源科技（北京）股份有限公司 | Reduce the energy conservation and dilatation heating system of a heat supply network return water temperature |
| CN109654579A (en) * | 2018-12-20 | 2019-04-19 | 普瑞森能源科技（北京）股份有限公司 | The dilatation heating system of hot press recycling exhaust steam of electric power plant waste heat |
| CN113825370A (en) * | 2021-09-29 | 2021-12-21 | 华南理工大学 | System and method for radiating heat of phase-change heat exchange cold plate driven by refrigerating pump combined with vapor chamber |
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| CN1959220A (en) * | 2006-09-06 | 2007-05-09 | 清华大学 | Heating system of water source heat pump by using remaining heat of condensed steam from power plant |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453567A (en) * | 2013-09-15 | 2013-12-18 | 张茂勇 | Low vacuum ejector heat pump composite waste-heat heating supply system based on huge temperature-difference heat supply network |
| CN103759316A (en) * | 2013-12-31 | 2014-04-30 | 中国能源建设集团山西省电力勘测设计院 | Cascade heating system for heat supply network circulation water |
| CN105276653A (en) * | 2015-11-25 | 2016-01-27 | 北京市煤气热力工程设计院有限公司 | Heat exchange unit and method for integrating absorption heat pump and electric heat pump |
| CN105276653B (en) * | 2015-11-25 | 2018-01-05 | 北京市煤气热力工程设计院有限公司 | A kind of heat-exchange unit and method of integrated absorption heat pump and electric heat pump |
| CN108506995A (en) * | 2018-02-08 | 2018-09-07 | 中国科学院上海应用物理研究所 | Passive list tank thermal storage heating system |
| CN108870507A (en) * | 2018-04-03 | 2018-11-23 | 大连葆光节能空调设备厂 | A kind of big temperature-difference central heating system using double condensers |
| CN108800275A (en) * | 2018-07-16 | 2018-11-13 | 河南理工大学 | A kind of big temperature-difference central heating system and working method using residual heat of electric power plant |
| CN108800275B (en) * | 2018-07-16 | 2023-05-26 | 河南理工大学 | Large-temperature-difference central heating system utilizing waste heat of power plant and working method |
| 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 |
| CN109539358A (en) * | 2018-12-20 | 2019-03-29 | 普瑞森能源科技（北京）股份有限公司 | Reduce the energy conservation and dilatation heating system of a heat supply network return water temperature |
| CN109654579A (en) * | 2018-12-20 | 2019-04-19 | 普瑞森能源科技（北京）股份有限公司 | The dilatation heating system of hot press recycling exhaust steam of electric power plant waste heat |
| CN113825370A (en) * | 2021-09-29 | 2021-12-21 | 华南理工大学 | System and method for radiating heat of phase-change heat exchange cold plate driven by refrigerating pump combined with vapor chamber |
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Application publication date: 20111228 |