CN111947201A - Method for increasing heat supply area by cascade utilization of heat supply backwater of thermal power plant - Google Patents
Method for increasing heat supply area by cascade utilization of heat supply backwater of thermal power plant Download PDFInfo
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- CN111947201A CN111947201A CN202010703275.7A CN202010703275A CN111947201A CN 111947201 A CN111947201 A CN 111947201A CN 202010703275 A CN202010703275 A CN 202010703275A CN 111947201 A CN111947201 A CN 111947201A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 230000005855 radiation Effects 0.000 claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000002918 waste heat Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention relates to a method for increasing heat supply area by cascade utilization of heat supply backwater of a thermal power plant, which comprises a boiler, a steam turbine, a condenser, a heat exchanger, a heat pump, a low-temperature floor radiation heating system, a fan coil, a cooling tower, a matched valve, a water pump and other equipment. The method is characterized in that the method is combined with novel terminal heat dissipation equipment (low-temperature floor radiation heating) and a heat pump, traditional centralized heating backwater is subjected to 3-stage cascade utilization according to temperature, backwater temperature is reduced, backwater temperature difference is enlarged, exhaust steam waste heat is recycled, the temperature is raised to 60 ℃ by a backheating heater, the exhaust steam waste heat enters a heating steam extraction condenser, and the next cycle is continued. On the premise of not increasing the consumption of a main pipe network and a circulating pump and changing conventional high-temperature heat supply parameters, the newly increased heat supply area can be maximized by more than 80%, high-quality high-temperature resources (high-temperature hot water) are not consumed by the increased part, and meanwhile, the exhaust steam waste heat is recycled to reduce the steam extraction amount, so that energy conservation is realized and the operating efficiency of a power plant is improved.
Description
Technical Field
The invention relates to the field of central heating, in particular to a method for increasing the heating area by cascade utilization of heating backwater of a thermal power plant.
Background
In a traditional heat and power cogeneration centralized heating mode of a thermal power plant, as shown in fig. 1, a radiator is used indoors for heating, and in order to achieve indoor thermal comfort, the temperature of hot water supply is not lower than 70 ℃, so that the temperature of return water is generally not lower than 60 ℃, and the temperature difference of supply and return water is 10 ℃.
For the urban heat supply system, the thermal power plant and the matched pipe network system thereof are huge, complex and large in investment, and cannot flexibly adapt to the rapid promotion of urbanization, so that the heat supply requirement of a newly-built building is met. On the other hand, a large amount of low-temperature waste heat exists in the exhaust steam of the thermal power plant, but the tail end of the exhaust steam has higher water supply temperature, so that the exhaust steam cannot be directly used as a heat supply source.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for increasing the heat supply area by cascade utilization of heat supply backwater of a thermal power plant, so that energy conservation is realized, and the operation efficiency of the power plant is improved.
A method for increasing heat supply area by cascade utilization of heat supply backwater of a thermal power plant comprises a boiler, a steam turbine, a condenser, a heat exchanger, a heat pump, a low-temperature floor radiation heating system, a fan coil and a cooling tower, wherein 3-level cascade utilization of high-temperature backwater of a backbone network is realized:
level 1 utilization:
the temperature of 120 ℃ hot water of a heat supply backbone network is reduced to 60 ℃ after heat exchange with an original heating user through a heat exchanger 1, the temperature of 60 ℃ high-temperature return water of the backbone network is reduced to 35 ℃ after direct heat exchange with a newly-added low-temperature floor radiation heating system user through a heat exchanger 2, the water supply temperature of the newly-added low-temperature floor radiation heating system is increased to 40 ℃ from 30 ℃, the indoor thermal comfort requirement can be guaranteed, and the level 1 utilization of the high-temperature return water of the backbone network is realized;
level 2 utilization:
the temperature of return water of a 35-DEG C heat supply backbone network is reduced to 15 ℃ after the return water passes through the heat pump 3 and the heat pump 4 and is utilized by a user of a newly-added fan coil heat supply system, the water supply temperature of the newly-added fan coil heat supply system is increased to 45 ℃ from 40 ℃, the requirement of indoor thermal comfort can be met, and the grade 2 utilization of the high-temperature return water of the backbone network is realized;
level 3 utilization:
the return water of a 15 ℃ heat supply backbone network is used for recovering the waste steam waste heat of a steam turbine of a thermal power plant through a heat exchanger 9, the temperature is raised to 30 ℃, the 3 rd-level utilization of the high-temperature return water of the backbone network is realized, at the moment, valves 5 and 6 are closed, valves 7 and 8 are opened, the cooling water of an exhaust steam condenser is reduced to 25 ℃ from 35 ℃ through the heat exchanger 9, in non-heat supply seasons, the valves 7 and 8 are closed, the valves 5 and 6 are opened, and the cooling water of the exhaust steam condenser is reduced to 25 ℃ through a cooling tower;
and finally, returning water of the heat supply backbone network at the temperature of 30 ℃ exchanges heat with the low-pressure steam of an extraction part of the steam turbine, the temperature is raised to 60 ℃, the returned water enters an extraction condenser for supplying the conventional heat supply system, and the returned water is heated to 120 ℃ by using the steam at the pressure of 0.5MPa for the next cycle without changing the originally designed high-temperature heat supply parameters.
The invention has the following advantages:
1. on the premise of not increasing consumption of a main pipe network and a circulating pump and changing conventional high-temperature heat supply parameters, the novel terminal heat dissipation device (low-temperature floor radiation heating) and the use of a heat pump are combined, the traditional centralized heat supply backwater is subjected to 3-level cascade utilization according to temperature, the backwater temperature is reduced to enlarge the temperature difference of the backwater supply to 105 ℃, the newly increased heat supply area can be increased to more than 80 percent to the maximum extent, and the increased part does not consume high-quality high-temperature resources.
2. The heat supply backwater after the cascade utilization is used for recovering the waste heat of the exhaust steam, the actual heat supply steam extraction amount is reduced, the operation efficiency of the cogeneration system is improved, the energy conservation and consumption reduction are realized, and the economic benefit of a power plant is increased.
Drawings
Fig. 1 is a schematic view of a cogeneration central heating system of a conventional thermal power plant.
Figure 2 is a schematic view of the heating system of the present invention.
Fig. 3 is a system flow diagram of the present invention.
Detailed Description
Referring to fig. 2 and 3, the method for increasing the heat supply area by the cascade utilization of the heat supply return water of the thermal power plant comprises a boiler, a steam turbine, a condenser, a heat exchanger, a heat pump, a low-temperature floor radiation heating system, a fan coil, a cooling tower, a matched valve, a water pump and other equipment, 3-stage cascade utilization of the high-temperature return water of a backbone network is realized, the return water temperature is reduced, and the heat supply area is increased by enlarging the temperature difference of the supply return water on the premise of not increasing the consumption of the backbone network and a circulating pump.
Level 1 utilization:
the temperature of the 120 ℃ heat supply backbone network hot water is reduced to 60 ℃ after heat exchange with an original heating user through the heat exchanger 1, and the temperature of the 60 ℃ backbone network high-temperature return water is reduced to 35 ℃ after direct heat exchange with a newly-added low-temperature floor radiation heating system user through the heat exchanger 2. The water supply temperature of the newly-added low-temperature floor radiation heating system is increased from 30 ℃ to 40 ℃, the requirement of indoor thermal comfort can be met, and the level 1 utilization of the high-temperature return water of the backbone network is realized.
Level 2 utilization:
the temperature of return water of a 35 ℃ heat supply backbone network is reduced to 15 ℃ after the return water passes through the heat pump 3 and the heat pump 4 and is utilized by a user of a newly-added fan coil heat supply system. For a heat pump heating system, the quality of a low-temperature heat source at the condenser side of the heat pump is high, the evaporation temperature of a unit can reach 15 ℃, the energy efficiency ratio COP of the system exceeds 5, while the heat supply COP of a conventional water source heat pump system in winter is generally not more than 3.5, so that a large amount of energy can be saved and power consumption can be reduced. The water supply temperature of the newly-added fan coil heating system is increased from 40 ℃ to 45 ℃, the requirement of indoor thermal comfort can be met, and the 2 nd-level utilization of high-temperature return water of the backbone network is realized.
Level 3 utilization:
the 15 ℃ return water of the heat supply backbone network is recycled by the heat exchanger 9 to recover the waste steam heat of the steam turbine of the thermal power plant, the temperature is raised to 30 ℃, and the 3 rd-level utilization of the high-temperature return water of the backbone network is realized. At the moment, the valves 5 and 6 are closed, the valves 7 and 8 are opened, and the cooling water of the dead steam condenser is reduced to 25 ℃ from 35 ℃ through the heat exchanger 9. In non-heat supply seasons, the valves 7 and 8 are closed, the valves 5 and 6 are opened, and the cooling water at 35 ℃ of the exhaust steam condenser is cooled to 25 ℃ through the cooling tower.
And finally, returning water of the heat supply backbone network at the temperature of 30 ℃ exchanges heat with the low-pressure steam of an extraction part of the steam turbine, the temperature is raised to 60 ℃, the returned water enters an extraction condenser for supplying the conventional heat supply system, and the returned water is heated to 120 ℃ by using the steam at the pressure of 0.5MPa for the next cycle without changing the originally designed high-temperature heat supply parameters.
The invention can combine the use of novel tail end heat dissipation equipment (low temperature floor radiation heating) and a heat pump under the premise of not increasing the consumption of a main pipe network and a circulating pump and changing the conventional high temperature heat supply parameters, and carries out 3-level cascade utilization on the traditional centralized heat supply backwater according to the temperature, reduces the backwater temperature to enlarge the temperature difference of the backwater supply to 105 ℃, can maximize the newly-increased heat supply area by more than 80 percent, and does not consume high-quality high temperature resources on the increased part; the heat supply backwater after the cascade utilization is used for recovering the waste heat of the exhaust steam, the actual heat supply steam extraction amount is reduced, the operation efficiency of the cogeneration system is improved, the energy conservation and consumption reduction are realized, and the economic benefit of a power plant is increased.
Claims (1)
1. The method for increasing the heat supply area by the cascade utilization of the heat supply backwater of the thermal power plant is characterized by comprising a boiler, a steam turbine, a condenser, a heat exchanger, a heat pump, a low-temperature floor radiation heating system, a fan coil and a cooling tower, wherein 3 stages of cascade utilization of the high-temperature backwater of a backbone network are carried out:
level 1 utilization:
the temperature of 120 ℃ hot water of a heat supply backbone network is reduced to 60 ℃ after heat exchange with an original heating user through a heat exchanger 1, the temperature of 60 ℃ high-temperature return water of the backbone network is reduced to 35 ℃ after direct heat exchange with a newly-added low-temperature floor radiation heating system user through a heat exchanger 2, the water supply temperature of the newly-added low-temperature floor radiation heating system is increased to 40 ℃ from 30 ℃, the indoor thermal comfort requirement can be guaranteed, and the level 1 utilization of the high-temperature return water of the backbone network is realized;
level 2 utilization:
the temperature of return water of a 35-DEG C heat supply backbone network is reduced to 15 ℃ after the return water passes through the heat pump 3 and the heat pump 4 and is utilized by a user of a newly-added fan coil heat supply system, the water supply temperature of the newly-added fan coil heat supply system is increased to 45 ℃ from 40 ℃, the requirement of indoor thermal comfort can be met, and the grade 2 utilization of the high-temperature return water of the backbone network is realized;
level 3 utilization:
the return water of a 15 ℃ heat supply backbone network is used for recovering the waste steam waste heat of a steam turbine of a thermal power plant through a heat exchanger 9, the temperature is raised to 30 ℃, the 3 rd-level utilization of the high-temperature return water of the backbone network is realized, at the moment, valves 5 and 6 are closed, valves 7 and 8 are opened, the cooling water of an exhaust steam condenser is reduced to 25 ℃ from 35 ℃ through the heat exchanger 9, in non-heat supply seasons, the valves 7 and 8 are closed, the valves 5 and 6 are opened, and the cooling water of the exhaust steam condenser is reduced to 25 ℃ through a cooling tower;
and finally, returning water of the heat supply backbone network at the temperature of 30 ℃ exchanges heat with the low-pressure steam of an extraction part of the steam turbine, the temperature is raised to 60 ℃, the returned water enters an extraction condenser for supplying the conventional heat supply system, and the returned water is heated to 120 ℃ by using the steam at the pressure of 0.5MPa for the next cycle without changing the originally designed high-temperature heat supply parameters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010703275.7A CN111947201A (en) | 2020-07-21 | 2020-07-21 | Method for increasing heat supply area by cascade utilization of heat supply backwater of thermal power plant |
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| CN202010703275.7A CN111947201A (en) | 2020-07-21 | 2020-07-21 | Method for increasing heat supply area by cascade utilization of heat supply backwater of thermal power plant |
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| CN111947201A true CN111947201A (en) | 2020-11-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659195A (en) * | 2022-03-24 | 2022-06-24 | 广东省电信规划设计院有限公司 | Heat recycling method and device and computer storage medium |
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| CN107676859A (en) * | 2017-10-16 | 2018-02-09 | 山西三水能源股份有限公司 | A kind of big temperature difference heat exchange station of cascade utilization |
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| JP2019117005A (en) * | 2017-12-27 | 2019-07-18 | 株式会社ガスター | Hot water supply heating system |
| CN210373658U (en) * | 2019-09-09 | 2020-04-21 | 北京热科能源技术研究有限公司 | Central heating system |
| CN210463183U (en) * | 2019-08-27 | 2020-05-05 | 北京源深节能技术有限责任公司 | Waste heat supply device based on steam ejector and suitable for high return water temperature |
-
2020
- 2020-07-21 CN CN202010703275.7A patent/CN111947201A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101109538A (en) * | 2006-07-17 | 2008-01-23 | 葆光（大连）节能技术研究所有限公司 | Method for improving heat supplying pipeline utilization efficiency |
| CN102278786A (en) * | 2011-08-13 | 2011-12-14 | 双良节能系统股份有限公司 | Central heating system using waste heat of direct air cooling power plant |
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| JP2019117005A (en) * | 2017-12-27 | 2019-07-18 | 株式会社ガスター | Hot water supply heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659195A (en) * | 2022-03-24 | 2022-06-24 | 广东省电信规划设计院有限公司 | Heat recycling method and device and computer storage medium |
| CN114659195B (en) * | 2022-03-24 | 2024-02-09 | 广东省电信规划设计院有限公司 | Heat recycling method and device and computer storage medium |
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Application publication date: 20201117 |