CN110030609B - Circulating cooling water waste heat recycling system - Google Patents
Circulating cooling water waste heat recycling system Download PDFInfo
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- CN110030609B CN110030609B CN201910220755.5A CN201910220755A CN110030609B CN 110030609 B CN110030609 B CN 110030609B CN 201910220755 A CN201910220755 A CN 201910220755A CN 110030609 B CN110030609 B CN 110030609B
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- heat exchanger
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- 239000000498 cooling water Substances 0.000 title claims abstract description 117
- 239000002918 waste heat Substances 0.000 title claims abstract description 58
- 238000004064 recycling Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 257
- 238000010521 absorption reaction Methods 0.000 claims abstract description 75
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003134 recirculating effect Effects 0.000 claims description 3
- 239000010908 plant waste Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 5
- 230000003749 cleanliness Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005352 clarification Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
-
- 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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B7/00—Combinations of two or more condensers, e.g. provision of reserve condenser
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
- F28B9/06—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid with provision for re-cooling the cooling water or other cooling liquid
-
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
-
- 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]
-
- 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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to the technical field of power plant waste heat recovery, and discloses a circulating cooling water waste heat recovery and utilization system. The circulating cooling water waste heat recycling system comprises a first condenser and an absorption heat pump which are sequentially arranged, wherein a primary side inlet of the first condenser is communicated with an external first turbine, a secondary side water outlet of the first condenser is simultaneously communicated with a heat source side water inlet of the absorption heat pump and a heat source side water inlet of the absorption heat pump, a secondary side water inlet of the first condenser is communicated with a heat source side water outlet of the absorption heat pump, a heat source side water outlet of the absorption heat pump is communicated with a water inlet of a heat supply network, and a water return inlet of the heat supply network is simultaneously communicated with a secondary side water inlet of the first condenser and a heat source side water outlet of the absorption heat pump. The circulating cooling water waste heat recycling system can fully utilize low-grade waste heat in the circulating cooling water system, and reduce heat energy loss.
Description
Technical Field
The invention relates to the technical field of power plant waste heat recovery, in particular to a circulating cooling water waste heat recovery and utilization system.
Background
At present, a great part of generator sets of small-sized thermal power plants or self-contained power plants of metallurgical enterprises in China adopt a circulating cooling water system to cool dead steam exhausted by a turbine of the generator set in a condenser into condensation water so as to reduce the exhaust steam temperature of the turbine and ensure the vacuum degree of the generator set.
However, in the prior art, two ways are generally used to treat the heat in the circulating cooling water system: the first is to directly connect the circulating cooling water system with an external cooling tower so that heat can be directly released into the atmosphere, but this way can cause a great deal of heat loss, thus directly leading to serious waste of heat energy; the second is to connect the circulating cooling water system with the heat consumer for supplying heat to the heat consumer, but since the waste heat in the circulating cooling water system is low-grade waste heat (i.e. less heat energy), it is difficult to use the circulating cooling water system for the heat consumer, and even if the circulating cooling water system is used for supplying heat to the heat consumer, the heat supply requirement is difficult to meet.
Aiming at the defects of the prior art, the person skilled in the art is urgent to find a circulating cooling water waste heat recycling system which can fully utilize the waste heat of a power plant to improve the temperature of the circulating cooling water so as to improve the recycling of the low-grade waste heat of the circulating cooling water and reduce the heat energy loss of the power plant.
Disclosure of Invention
The invention provides a circulating cooling water waste heat recycling system, which can fully utilize the waste heat of a power plant to improve the temperature of the circulating cooling water so as to improve the recycling of low-grade waste heat of the circulating cooling water and reduce the heat energy loss of the power plant.
The circulating cooling water waste heat recycling system comprises a first condenser and an absorption heat pump which are sequentially arranged, wherein a primary side inlet of the first condenser is communicated with an external first turbine, a secondary side water outlet of the first condenser is simultaneously communicated with a heat source side water inlet of the absorption heat pump and a heat source side water inlet of the absorption heat pump, a secondary side water inlet of the first condenser is communicated with a heat source side water outlet of the absorption heat pump, a heat source side water outlet of the absorption heat pump is communicated with a water inlet of a heat supply network, and a water return inlet of the heat supply network is simultaneously communicated with a secondary side water inlet of the first condenser and a heat source side water outlet of the absorption heat pump.
Further, the circulating cooling water waste heat recycling system further comprises a second condenser arranged between the first condenser and the water return port of the heat supply network, a primary side inlet of the second condenser is communicated with an external second steam turbine, a secondary side water inlet of the second condenser is communicated with the water return port of the heat supply network, and a secondary side water outlet of the second condenser is simultaneously communicated with the heat source side water outlet of the absorption heat pump and the secondary side water inlet of the first condenser.
Further, the amount of the circulating cooling water contained in the first condenser is larger than the amount of the circulating cooling water contained in the second condenser.
Further, the circulating cooling water waste heat recycling system further comprises a peak heater communicated with a hot network water side water outlet of the absorption heat pump and a hot network heat exchanger communicated with the peak heater, wherein the water outlet of the peak heater is communicated with a primary side water inlet of the hot network heat exchanger, the primary side water return of the hot network heat exchanger is communicated with a secondary side water inlet of the second condenser, and a secondary side outlet of the hot network heat exchanger is communicated with a heat supply secondary network.
Further, the circulating cooling water waste heat recycling system further comprises a condensing device and a first heat exchanger, the steam inlet of the absorption heat pump is communicated with an external driving steam pipeline, the condensed water outlet of the absorption heat pump is communicated with the condensed water inlet of the condensing device, the steam inlet of the peak heater is communicated with the external driving steam pipeline, the steam outlet of the peak heater is communicated with the condensed water inlet of the condensing device, the condensed water outlet of the condensing device is communicated with a primary water inlet of the first heat exchanger, the primary water outlet of the first heat exchanger is communicated with an external demineralized water tank, the secondary water inlet of the first heat exchanger is simultaneously communicated with a hot network water side water inlet of the absorption heat pump and a secondary water outlet of the first condenser, and the secondary water outlet of the first heat exchanger is simultaneously communicated with a hot network water side water outlet of the absorption heat pump and a water inlet of the peak heater.
Further, a desuperheater is arranged on a pipeline of a steam inlet of the absorption heat pump, and the desuperheater is communicated with a condensate water outlet of the condensing device.
Further, the heat source side water inlet of the absorption heat pump, the heat network water side water inlet of the absorption heat pump, the steam inlet of the absorption heat pump and the steam inlet of the peak heater are all provided with filtering devices.
Further, the circulating cooling water waste heat recycling system further comprises a preheating system, the preheating system comprises a second heat exchanger, a primary water inlet of the second heat exchanger is communicated with a primary water return inlet of the heat supply network heat exchanger, a primary water outlet of the second heat exchanger is communicated with a secondary water inlet of the second condenser, a secondary water inlet of the second heat exchanger is communicated with an external raw water source, and a secondary water outlet of the second heat exchanger is communicated with an external raw water clarification tank.
Further, the preheating system further comprises a third heat exchanger, the primary water inlet of the third heat exchanger is simultaneously communicated with the primary water return of the heat supply network heat exchanger and the primary water inlet of the second heat exchanger, the primary water outlet of the third heat exchanger is communicated with the secondary water inlet of the second condenser, the secondary water inlet of the third heat exchanger is communicated with an external ion exchanger, and the secondary water outlet of the third heat exchanger is communicated with an external demineralized water reheater.
Further, the circulating cooling water waste heat recycling system further comprises a cooling tower, a water inlet of the cooling tower is communicated with the secondary side water outlet of the first condenser and/or the secondary side water outlet of the second condenser, and a water outlet of the cooling tower is communicated with the secondary side water inlet of the first condenser and/or the secondary side water inlet of the second condenser.
Compared with the prior art, the circulating cooling water waste heat recycling system has the following advantages:
1) The circulating cooling water waste heat recycling system can directly improve the temperature in the circulating cooling water through the absorption heat pump, and can extract and transfer the heat of the circulating cooling water in the internal circulating system to the circulating cooling water in the heat supply system through the absorption heat pump, so that the low-temperature waste heat can be extracted to the greatest extent to improve the water supply temperature of the circulating cooling water, the heat supply requirement of a heat supply network is met, and the problem that the low-grade waste heat of the circulating cooling water in the prior art is difficult to recycle due to lower temperature is effectively solved;
2) According to the circulating cooling water waste heat recycling system, the second heat exchanger and the third heat exchanger are arranged, so that the raw water and desalted water can be preheated to achieve the heating effect, the circulating cooling water can be further recycled by the low-grade waste heat after passing through the heat supply network heat exchanger, the step full utilization of the low-grade waste heat of the circulating cooling water is achieved, meanwhile, the mode that the raw water and the desalted water in the prior art are preheated and heated by utilizing low-pressure steam in a plant area of a power plant is avoided, a large amount of low-pressure steam can be saved, and the waste of steam energy is avoided;
3) When part of pipelines or other parts in the circulating cooling water waste heat recycling system are damaged and cannot normally operate, the pipelines can be switched to the cooling tower, so that circulating cooling water can directly enter the cooling tower after passing through the first condenser and/or the second condenser, and normal and safe operation of the cooling circulating system under an accident condition is effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of a circulating cooling water waste heat recovery and utilization system according to the present invention.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
Fig. 1 shows a schematic diagram of a recirculating cooling water waste heat recovery system 100 in accordance with the present invention. As shown in fig. 1, the circulating cooling water waste heat recovery system 100 of the present invention includes a first condenser 11 and an absorption heat pump 2 which are sequentially disposed, a primary side inlet 111 of the first condenser 11 is communicated with an external first turbine 31, a secondary side water outlet 113 of the first condenser 11 is simultaneously communicated with a heat source side water inlet 21 of the absorption heat pump 2 and a heat source side water inlet 23 of the absorption heat pump 2, the secondary side water inlet 112 of the first condenser 11 is communicated with a heat source side water outlet 22 of the absorption heat pump 2, a heat source side water outlet 24 of the absorption heat pump 2 is communicated with a water inlet of a heat supply network, and a water return port of the heat supply network is simultaneously communicated with the secondary side water inlet 112 of the first condenser 11 and the heat source side water outlet 22 of the absorption heat pump 2.
When the circulating cooling water waste heat recycling system 100 is used, circulating cooling water sequentially passes through the secondary side water inlet 112 of the first condenser 11, the secondary side water outlet 113 of the first condenser 11, the hot network water side water inlet 23 of the absorption heat pump 2, the hot network water side water outlet 24 of the absorption heat pump 2, the water inlet of the heating network and the water return port of the heating network, and finally returns to the secondary side water inlet 112 of the first condenser 11 to form a circulating cooling water heating system for the heating network. Meanwhile, the circulating cooling water also passes through the secondary side water outlet 113 of the first condenser 11, the heat source side water outlet 22 of the absorption heat pump 2 and the heat source side water outlet 22 of the absorption heat pump 2, and finally returns to the secondary side water inlet 112 of the first condenser 11, so as to form an internal circulation system of the circulating cooling water.
Specifically, in the circulating cooling water heating system, after the circulating cooling water enters the first condenser 11, heat exchange is performed between the circulating cooling water and the high-temperature steam of the first steam turbine 31, so as to cool the first steam turbine 31, the circulating cooling water after temperature rise enters the secondary side of the absorption heat pump 2, and the absorption heat pump 2 can exchange the temperature of the low-pressure steam to the circulating cooling water under the action of the low-pressure steam, so that the temperature of the circulating cooling water can be raised again. Meanwhile, in the internal circulation system, after the circulating cooling water is heated by the first condenser 11, the circulating cooling water in one path enters the primary side of the absorption heat pump 2, and under the action of low-pressure steam, the absorption heat pump 2 can exchange the temperature of the circulating cooling water in the primary side to the circulating cooling water in the secondary side, that is, the circulating cooling water heated by the first condenser 11 can absorb the low-pressure steam and the temperature of the circulating cooling water in the primary side of the absorption heat pump 2 under the action of the absorption heat pump 2, so that the temperature of the circulating cooling water entering the heating network can be further increased.
Through the arrangement, compared with the prior art, the circulating cooling water waste heat recycling system 100 can directly improve the temperature in the circulating cooling water through the absorption heat pump 2, and can extract and transfer the heat of the circulating cooling water in the internal circulating system to the circulating cooling water in the heat supply system through the absorption heat pump 2, so that the low-temperature waste heat can be extracted to the greatest extent to improve the water supply temperature of the circulating cooling water, the heat supply requirement of a heat supply network is met, and the problem that the low-grade waste heat of the circulating cooling water in the prior art is difficult to recycle due to lower temperature is effectively avoided. Therefore, the circulating cooling water waste heat recovery and utilization system 100 of the present invention is more advantageous for recovery and utilization of waste heat of circulating cooling water. In addition, the circulating cooling water in the internal circulation system after the temperature is absorbed returns to the first condenser 11 again, and the temperature of the secondary water inlet 112 of the first condenser 11 can be reduced, so that the cooling effect of the first condenser 11 on the first turbine 31 can be more effectively improved.
In the preferred embodiment shown in fig. 1, the circulating cooling water waste heat recovery system 100 may further include a second condenser 12 disposed between the first condenser 11 and the water return port of the heating network, a primary side inlet 121 of the second condenser 12 is communicated with the external second turbine 32, a secondary side water inlet 122 of the second condenser 12 is communicated with the water return port of the heating network, and a secondary side water outlet 123 of the second condenser 12 is simultaneously communicated with the heat source side water outlet 22 of the absorption heat pump 2 and the secondary side water inlet 112 of the first condenser 11.
Through the arrangement, after the circulating cooling water sequentially passes through the two-stage heat exchange of the second condenser 12 and the first condenser 11, the temperature of the circulating cooling water can be directly increased step by step, so that the recovery and the utilization of low-grade waste heat of the circulating cooling water are more facilitated. Preferably, the power of the second turbine 32 may be smaller than that of the first turbine 31, for example, when the power of the first turbine 31 is 25MW, the power of the second turbine 31 may be 12MW, so that the circulating cooling water entering the first condenser 11 after heat exchange by the second condenser 12 can meet the cooling requirement of the first turbine 31, that is, the more the turbine with higher power generates more heat, the more heat exchanges with the circulating cooling water, so that the embodiment of the invention is not limited to the scheme of only two condensers as long as the power of the turbine is gradually increased or the cooling requirement of the circulating cooling water on the turbine is met.
In a preferred embodiment, the amount of the circulating cooling water contained in the first condenser 11 may be greater than the amount of the circulating cooling water contained in the second condenser 12. Through this setting, the great first condenser 11 of water content not only can effectually cool down first turbine 31, still makes the heat of circulating cooling water can more abundant absorption first turbine 31 to abundant temperature of circulating cooling water has been improved. For example, the amount of the circulating cooling water in the first condenser 11 may be about 5500t/h, and the amount of the circulating cooling water in the second condenser 12 may be about 2800t/h.
In a preferred embodiment as shown in fig. 1, the circulating cooling water waste heat recovery system 100 may further comprise a spike heater 41 in communication with the heat network water side water outlet 24 of the absorption heat pump 2 and a heat network heat exchanger 42 in communication with the spike heater 41, wherein the water outlet 411 of the spike heater 41 is in communication with the primary side water inlet 421 of the heat network heat exchanger 42, the primary side water return 422 of the heat network heat exchanger 42 is in communication with the secondary side water inlet 122 of the second condenser 12, and the secondary side outlet 423 of the heat network heat exchanger 42 is in communication with the heat supply network. Through this setting, in difficult cold period, ambient temperature is lower and makes the water supply temperature of recirculated cooling water lower, and the recirculated cooling water that gets into the heating network can get into at first in spike heater 41 and heat the intensification to make the temperature of recirculated cooling water can satisfy the heating demand of heating network. In the first and last cold periods, when the water supply temperature is not high, and the temperature of the circulating cooling water at the water outlet 24 of the heat supply network of the absorption heat pump 2 can meet the heat supply requirement of the heat supply network, the circulating cooling water can directly enter the heat supply network to supply heat through a bypass (not shown in the figure) connected in parallel with the peak heater 41 and connecting the water outlet 24 of the heat supply network of the absorption heat pump 2 and the water inlet of the heat supply network.
In a preferred embodiment as shown in fig. 1, the circulating cooling water waste heat recovery system 100 may further comprise a condensing device 51 and a first heat exchanger 52, wherein the steam inlet 25 of the absorption heat pump 2 is configured to be in communication with an external driving steam pipe (not shown in the figure), the condensed water outlet 26 of the absorption heat pump 2 is configured to be in communication with the condensed water inlet 511 of the condensing device 51, the steam inlet 412 of the spike heater 41 is configured to be in communication with an external driving steam pipe (not shown in the figure), the steam outlet 413 of the spike heater 41 is configured to be in communication with the condensed water inlet 511 of the condensing device 51, the condensed water outlet 512 of the condensing device 51 is configured to be in communication with the primary water inlet 521 of the first heat exchanger 52, the primary water outlet 522 of the first heat exchanger 52 is configured to be in communication with an external demineralized water tank, the secondary water inlet 523 of the first heat exchanger 52 is configured to be in communication with both the hot network water inlet 23 of the absorption heat pump 2 and the secondary water outlet 113 of the first condenser 11, and the secondary water outlet 524 of the first heat exchanger 52 is configured to be in communication with both the hot network water outlet 24 of the spike and the water inlet 41 of the absorption heat pump 2.
Through the arrangement, the condensing device 51 and the first heat exchanger 52 can facilitate recovery of the condensed water condensed by the steam acting on the absorption heat pump 2 and the peak heater 41, and the recovered condensed water has a large amount of heat, so that the circulating cooling water discharged from the secondary side water outlet 113 of the first condenser 11 can exchange heat with the primary side of the first heat exchanger 52 after passing through the secondary side of the first heat exchanger 52, thereby further improving the temperature of the circulating cooling water when entering the heating network, and further being beneficial to recovery and utilization of low-grade waste heat of the circulating cooling water. Meanwhile, the recirculating cooling water warmed up again can also reduce the amount of steam applied to the spike heater 41.
In a preferred embodiment as shown in fig. 1, a desuperheater 53 may be provided in the line of the steam inlet 25 of the absorption heat pump 2, the desuperheater 53 being in communication with the condensate outlet 512 of the condensing device 52. By the arrangement, the stability of the temperature of the driving steam source (namely low-pressure steam) of the absorption heat pump 2 can be ensured, and the influence on the normal operation of the absorption heat pump 2 caused by the too high pipe network temperature of the low-pressure steam is avoided.
In a preferred embodiment, the heat source side water inlet 21 of the absorption heat pump 2, the heat network water side water inlet 23 of the absorption heat pump 2, the steam inlet 25 of the absorption heat pump 2 and the steam inlet 412 of the spike heater 41 may be provided with filtering means (not shown in the figure) to ensure cleanliness of circulating cooling water and steam entering the absorption heat pump 2 and cleanliness of steam entering the spike heater 41, thereby avoiding clogging problems.
In a preferred embodiment as shown in fig. 1, the circulating cooling water waste heat recovery system 100 may further include a preheating system, the preheating system may include a second heat exchanger 61, a primary water inlet 611 of the second heat exchanger 61 is in communication with a primary water return 422 of the heat network heat exchanger 42, a primary water outlet 612 of the second heat exchanger 61 is in communication with a secondary water inlet 122 of the second condenser 12, a secondary water inlet 613 of the second heat exchanger 61 may be in communication with an external raw water source, and a secondary water outlet 614 of the second heat exchanger 61 may be in communication with an external raw water clarifier.
Preferably, the preheating system may further include a third heat exchanger 62, the primary water inlet 621 of the third heat exchanger 62 is simultaneously communicated with the primary water return 422 of the heat network heat exchanger 42 and the primary water inlet 611 of the second heat exchanger 61, the primary water outlet 622 of the third heat exchanger 62 is communicated with the secondary water inlet 122 of the second condenser 12, the secondary water inlet 623 of the third heat exchanger 62 may be communicated with an external ion exchanger, and the secondary water outlet 624 of the third heat exchanger 62 may be communicated with an external demineralized water reheater.
Because steam-water loss exists in the production process of the power plant generator set inevitably, desalted water with certain temperature and qualified water quality is required to be supplemented to the system. The demineralized water used in the power plant comes from a water-dissolving workshop, the water source of the water-dissolving workshop is generally taken from underground raw water or primary filtered raw water of a river, the temperature of the raw water is low, the raw water cannot be directly used, and the raw water needs to be preheated and heated before entering a raw water clarifying tank, so that flocculating agents such as polymeric ferric sulfate and the like can achieve the best purifying effect. The purified and filtered raw water is pumped into an ion exchanger through clear water to remove hard salts in the water to form desalted water, and the desalted water is preheated and heated and then is sent into a boiler deaerator for next-stage treatment. The circulating cooling water waste heat recycling system 100 can achieve the effect of preheating raw water and desalted water by arranging the second heat exchanger 61 and the third heat exchanger 62, so that the circulating cooling water can further recycle low-grade waste heat after passing through the heat supply network heat exchanger 42, the full utilization of the circulating cooling water low-grade waste heat is achieved, meanwhile, the method that the raw water and the desalted water in the prior art are preheated and warmed by utilizing low-pressure steam in a plant area of a power plant is avoided, a large amount of low-pressure steam can be saved, and the waste of steam energy is avoided.
Specifically, the circulating cooling water discharged from the primary water return port 422 of the heat grid heat exchanger 42 still has residual heat after heat exchange at the primary side and the secondary side of the heat grid heat exchanger 42, and the circulating cooling water having residual heat can be introduced into the primary side of the second heat exchanger 61 to preheat the raw water at the secondary side of the second heat exchanger 61 and/or introduced into the primary side of the third heat exchanger 62 to preheat the demineralized water at the secondary side of the third heat exchanger 62 by communicating the primary water return port 422 of the heat grid heat exchanger 42 with the primary water inlet 611 of the second heat exchanger 61 and/or the primary water inlet 621 of the third heat exchanger 62, so that the temperature of the raw water and/or the demineralized water can be directly increased. In addition, after heat exchange of the second heat exchanger 61 and/or the third heat exchanger 62, the circulating cooling water with reduced temperature is further beneficial to the cooling effect of the circulating cooling water on the second turbine 32 or the first turbine 31 after entering the second condenser 12 or the first condenser 11.
Preferably, a dirt separator 43 (shown in fig. 1) may be disposed on the main pipelines of the heat network heat exchanger 42 and the preheating system, so as to ensure cleanliness of the cooling circulating water discharged through the primary side water return port 422 of the heat network heat exchanger 42 when entering the preheating system. It is also preferable that a plurality of pressure detecting devices (not shown), a plurality of flow detecting devices (not shown) and a plurality of temperature sensors (not shown) be provided on each connection pipe, and the temperature sensors be signal-interlocked with the controller to ensure the normal and safe operation of the circulating cooling water waste heat recovery system 100.
In a preferred embodiment as shown in fig. 1, the circulating cooling water waste heat recovery system 100 may further include a cooling tower 7, the water inlet 71 of the cooling tower 7 may be in communication with the secondary side water outlet 113 of the first condenser 11 and/or the secondary side water outlet 123 of the second condenser 12, and the water outlet 72 of the cooling tower 7 may be in communication with the secondary side water inlet 112 of the first condenser 11 and/or the secondary side water inlet 122 of the second condenser 12. Through the arrangement, when part of pipelines or other components in the circulating cooling water waste heat recycling system 100 are damaged and cannot normally operate, the pipelines can be switched to the cooling tower 7, so that circulating cooling water can directly enter the cooling tower 7 after passing through the first condenser 11 and/or the second condenser 12, and normal and safe operation of the cooling circulating system under an accident condition is effectively ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (8)
1. The circulating cooling water waste heat recycling system is characterized by comprising a first condenser and an absorption heat pump which are sequentially arranged, wherein a primary side inlet of the first condenser is communicated with an external first turbine, a secondary side water outlet of the first condenser is simultaneously communicated with a heat source side water inlet of the absorption heat pump and a heat source side water inlet of the absorption heat pump, the secondary side water inlet of the first condenser is communicated with a heat source side water outlet of the absorption heat pump, a heat source side water outlet of the absorption heat pump is communicated with a water inlet of a heat supply network, and a water return port of the heat supply network is simultaneously communicated with the secondary side water inlet of the first condenser and the heat source side water outlet of the absorption heat pump; the circulating cooling water waste heat recycling system further comprises a second condenser arranged between the first condenser and the water return port of the heat supply network, wherein a primary side inlet of the second condenser is communicated with an external second turbine, a secondary side water inlet of the second condenser is communicated with the water return port of the heat supply network, and a secondary side water outlet of the second condenser is simultaneously communicated with a heat source side water outlet of the absorption heat pump and a secondary side water inlet of the first condenser; wherein the water quantity of the circulating cooling water contained in the first condenser is larger than the water quantity of the circulating cooling water contained in the second condenser; the power of the second turbine is less than the power of the first turbine.
2. The circulating cooling water waste heat recovery and utilization system according to claim 1, further comprising a peak heater communicated with a hot network water side water outlet of the absorption heat pump and a hot network heat exchanger communicated with the peak heater, wherein a water outlet of the peak heater is communicated with a primary side water inlet of the hot network heat exchanger, a primary side water return of the hot network heat exchanger is communicated with a secondary side water inlet of the second condenser, and a secondary side outlet of the hot network heat exchanger is communicated with a heat supply secondary network.
3. The circulating cooling water waste heat recovery system of claim 2, further comprising a condensing device and a first heat exchanger, wherein the vapor inlet of the absorption heat pump is configured to communicate with an external driving vapor pipe, the condensed water outlet of the absorption heat pump is configured to communicate with the condensed water inlet of the condensing device, the vapor inlet of the spike heater is configured to communicate with the external driving vapor pipe, the vapor outlet of the spike heater is configured to communicate with the condensed water inlet of the condensing device, the condensed water outlet of the condensing device is configured to communicate with a primary water inlet of the first heat exchanger, the primary water outlet of the first heat exchanger is configured to communicate with an external demineralized water tank, the secondary water inlet of the first heat exchanger is configured to communicate with both the hot-water side water inlet of the absorption heat pump and the secondary water outlet of the first condenser, and the secondary water outlet of the first heat exchanger is configured to communicate with both the hot-water side water outlet of the absorption heat pump and the water inlet of the spike heater.
4. A recirculating cooling water waste heat recovery system according to claim 3, wherein a desuperheater is provided on the line of the vapour inlet of the absorption heat pump, which desuperheater is in communication with the condensate outlet of the condensing means.
5. The circulating cooling water waste heat recovery system according to claim 3, wherein a heat source side water inlet of the absorption heat pump, a heat network water side water inlet of the absorption heat pump, a steam inlet of the absorption heat pump, and a steam inlet of the peak heater are provided with filtering devices.
6. The system of claim 4 or 5, further comprising a preheating system, wherein the preheating system comprises a second heat exchanger, wherein a primary water inlet of the second heat exchanger is communicated with a primary water outlet of the heat supply network heat exchanger, wherein a primary water outlet of the second heat exchanger is communicated with a secondary water inlet of the second condenser, wherein a secondary water inlet of the second heat exchanger is communicated with an external raw water source, and wherein a secondary water outlet of the second heat exchanger is communicated with an external raw water clarifier.
7. The circulating cooling water waste heat recovery and utilization system according to claim 6, wherein the preheating system further comprises a third heat exchanger, a primary water inlet of the third heat exchanger is simultaneously communicated with a primary water return of the heat supply network heat exchanger and a primary water inlet of the second heat exchanger, a primary water outlet of the third heat exchanger is communicated with a secondary water inlet of the second condenser, a secondary water inlet of the third heat exchanger is communicated with an external ion exchanger, and a secondary water outlet of the third heat exchanger is communicated with an external demineralized water reheater.
8. The circulating cooling water waste heat recovery and utilization system according to claim 1, further comprising a cooling tower, wherein a water inlet of the cooling tower is communicated with the secondary side water outlet of the first condenser and/or the secondary side water outlet of the second condenser, and a water outlet of the cooling tower is communicated with the secondary side water inlet of the first condenser and/or the secondary side water inlet of the second condenser.
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