CN112178980A - Waste heat utilization system and method based on electrically driven water source heat pump unit - Google Patents
Waste heat utilization system and method based on electrically driven water source heat pump unit Download PDFInfo
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- CN112178980A CN112178980A CN202011057737.9A CN202011057737A CN112178980A CN 112178980 A CN112178980 A CN 112178980A CN 202011057737 A CN202011057737 A CN 202011057737A CN 112178980 A CN112178980 A CN 112178980A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 291
- 239000002918 waste heat Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 10
- 238000011001 backwashing Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 238000010795 Steam Flooding Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
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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
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Abstract
The invention relates to a waste heat utilization system and method based on an electric drive water source heat pump unit. The power plant circulating water system and the electric drive water source heat pump unit are connected end to end through pipelines to form a first circulating loop. The terminal heat exchange device and the electric drive water source heat pump unit are connected end to end through pipelines to form a second circulation loop. The electrically driven water source heat pump unit comprises a first heat exchange device and a second heat exchange device. The control switching device of the control center selectively connects the first heat exchange device to the second circulation loop and connects the second heat exchange device to the first circulation loop, or connects the second heat exchange device to the second circulation loop and connects the first heat exchange device to the first circulation loop, so as to realize the switching of the heating and cooling modes of the electric drive water source heat pump unit. The problem of heat pump technology among the prior art in the regional utilization ratio low in south, the waste heat of retrieving can not be used for refrigeration is solved.
Description
Technical Field
The invention relates to the technical field of waste heat utilization of thermal power plants, in particular to a waste heat utilization system and method based on an electrically driven water source heat pump unit.
Background
The waste heat utilization technology of the thermal power plant is widely utilized, and the waste heat of the thermal power plant is recycled, so that the production energy consumption of power enterprises can be effectively reduced, and the comprehensive utilization level of energy of the power plant is improved.
The heat pump technology has attracted high attention from national and local governments because of its characteristics of high efficiency, energy saving and environmental protection. With the gradual maturity and rapid development of heat pump technology, the heat pump technology is more applied to northern areas in China, a large amount of steam is discharged from a thermal power plant, the steam drives a water source heat pump unit to recover waste heat of the thermal power plant, and the recovered waste heat is used for heating. However, in the southern areas of China, the heat supply demand is low and the cooling demand is high due to the influence of climate conditions, but in the southern areas, thermal power plants mostly have no abundant steam to provide a driving heat pump unit, so that the heat pump technology cannot be effectively utilized in the southern areas.
Disclosure of Invention
Technical problem to be solved
The invention relates to a waste heat utilization system and method based on an electrically driven water source heat pump unit, and solves the problems that the utilization rate of a heat pump technology in the south of the prior art is low and the recovered waste heat cannot be used for refrigeration.
Disclosure of the invention
Aiming at the defects in the prior art, the invention provides a waste heat utilization system and method based on an electrically driven heat pump unit, and the specific technical scheme is as follows:
a waste heat utilization system based on an electrically driven water source heat pump unit comprises a control center, and a power plant circulating water system, the electrically driven water source heat pump unit and a terminal heat exchange device which are in communication connection with the control center;
the power plant circulating water system and the electric drive water source heat pump unit are connected end to end through pipelines to form a first circulating loop;
the terminal heat exchange device is connected with the electrically driven water source heat pump unit end to end through a pipeline to form a second circulation loop;
the electrically driven water source heat pump unit comprises a first heat exchange device and a second heat exchange device, the first heat exchange device and the second heat exchange device are switched through a switching device, and the switching device is in communication connection with the control center; wherein the content of the first and second substances,
the switching device selectively connects the first heat exchange device to the second circulation loop and connects the second heat exchange device to the first circulation loop or connects the second heat exchange device to the second circulation loop and connects the first heat exchange device to the first circulation loop through the control of the control center.
Further, the switching device comprises a first bridge pipeline and a second bridge pipeline;
the first bridge type pipeline is connected to the first end of the electric drive water source heat pump unit, and the second bridge type pipeline is connected to the second end of the electric drive water source heat pump unit;
the first end is the water supply end of the waste heat water, and the second end is the water return end of the waste heat water.
Furthermore, both ends of the first bridge type pipeline are respectively connected with a waste hot water supply pipe and a terminal heat exchange device water inlet pipe;
the first bridge type pipeline is connected with a circulating water system of the power plant through a waste heat water supply pipe and is connected with a terminal heat exchange device through a terminal heat exchange device water inlet pipe;
two ends of the second bridge type pipeline are respectively connected with a residual hot water return pipe and a terminal heat exchange device return pipe;
the second bridge type pipeline is connected with a circulating water system of the power plant through a waste hot water return pipe and is connected with the terminal heat exchange device through a terminal heat exchange device return pipe.
Further, the first bridge type pipeline comprises a first pipeline and a second pipeline which are connected in parallel, and the second bridge type pipeline comprises a third pipeline and a fourth pipeline which are connected in parallel;
two ends of the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are respectively provided with an electric gate valve, and the electric gate valves are in communication connection with a control center;
two ends of the first heat exchange device are respectively communicated with the first pipeline and the third pipeline, and two ends of the second heat exchange device are respectively communicated with the second pipeline and the fourth pipeline.
Further, the power plant circulating water system comprises a unit and a cooling tower, wherein the cooling tower, a circulating water inlet pipe, the unit and a circulating water return pipe are sequentially connected end to end;
the residual heat water supply pipe is communicated with the circulating water inlet pipe;
the waste hot water return pipe comprises a first waste hot water return pipe and a second waste hot water return pipe, the first waste hot water return pipe is communicated with the circulating water return pipe, and the second waste hot water return pipe is communicated with the cooling tower.
Further, the connecting side of the waste hot water supply pipe and the circulating water inlet pipe, the connecting side of the first waste hot water return pipe and the circulating water return pipe, and the connecting side of the second waste hot water return pipe and the cooling tower are respectively provided with an electric butterfly valve;
the electric butterfly valve is in communication connection with the control center.
Further, a first automatic backwashing filter is arranged on the water return pipe of the terminal heat exchange device, and a first temperature sensor and a flow sensor are sequentially arranged between the first automatic backwashing filter and the terminal heat exchange device;
a second automatic back-washing filter is arranged on the residual heat water supply pipe, and a second temperature sensor is arranged between the residual heat water supply pipe and the electric butterfly valve;
the first automatic backwashing filter, the second automatic backwashing filter, the first temperature sensor, the second temperature sensor and the electric butterfly valve are all in communication connection with the control center.
Further, the device also comprises a primary pump and a secondary pump;
the primary pump is arranged on the water return pipe of the terminal heat exchange device, and the secondary pump is arranged on the water inlet pipe of the terminal heat exchange device;
a constant pressure device is arranged between the first automatic backwashing filter and the primary pump;
the constant pressure device is in communication connection with the control center.
Further, the electrically driven water source heat pump unit is an integral device and also comprises a compressor; the first heat exchange device is a condenser, and the second heat exchange device is an evaporator.
In the invention, the waste heat utilization method based on the waste heat utilization system of the electrically driven water source heat pump unit comprises the following steps:
a heating period:
the switching device connects the first heat exchange device into the second circulation loop and connects the second heat exchange device into the first circulation loop through the control of the control center;
the residual hot water is conveyed to the second heat exchange device by the power plant circulating water system, and is cooled by the second heat exchange device and then flows back to the power plant circulating water system;
circulating water of the terminal heat exchange device is conveyed to the first heat exchange device by the terminal heat exchange device through the primary pump, and is pumped into the terminal heat exchange device by the secondary pump after being heated by the first heat exchange device;
and (3) during the refrigeration period:
the switching device connects the second heat exchange device into the second circulation loop and connects the first heat exchange device into the first circulation loop through the control of the control center;
the residual hot water is conveyed to the first heat exchange device from the power plant circulating water system, and flows back to the power plant circulating water system after being heated by the first heat exchange device (29);
circulating water of the terminal heat exchange device is pumped into the second heat exchange device by the terminal heat exchange device through the primary pump, and is pumped into the terminal heat exchange device by the secondary pump after being cooled by the second heat exchange device.
(III) advantageous effects
The waste heat utilization system and method based on the electrically driven water source heat pump unit effectively overcome the defects in the prior art.
In the invention, the water source heat pump unit is electrically driven, and the electric drive replaces the steam drive, so that the water source heat pump unit can be widely applied to southern areas in China. The electric drive water source heat pump unit and the thermal power plant circulating water system are communicated through a pipeline to form a first circulating loop, and the terminal heat exchange device and the electric drive water source heat pump unit are communicated through a pipeline to form a second circulating loop. The electrically driven water source heat pump unit comprises a first heat exchange device and a second heat exchange device, and the control center realizes automatic switching of the first heat exchange device and the second heat exchange device through controlling the switching device. And during a heating period, the second heat exchange device is automatically switched into the first circulation loop through the switching device, the first heat exchange device is automatically switched into the second circulation loop, low-temperature return water in the second circulation loop absorbs heat of residual hot water in the first circulation loop, and the residual hot water flows back to the terminal heat exchange device after being heated to realize heating. During the refrigeration period, the first heat exchange device is automatically switched into the first circulation loop through the switching device, the second heat exchange device is automatically switched into the second circulation loop, residual hot water in the first circulation loop absorbs heat of high-temperature return water in the second circulation loop, and circulating water of the cooled terminal heat exchange device is pumped into the terminal heat exchange device, so that the refrigeration purpose is achieved. Has the effects of refrigeration and heating, realizes automatic control and has wider application range.
According to the invention, the switching device selects a bridge type loop, the bridge type loop is a parallel pipeline, the electric gate valves are arranged at two ends of the pipeline, and the control center controls the electric gate valves to be started or closed, so that a first heat exchange device or a second heat exchange device communicated with the pipeline is added into a first circulation loop or a second circulation loop, and the switching between a cooling period and a heating period is further realized, and the purposes of heating in the heating period and cooling in the cooling period are realized through an electrically driven water source heat pump unit. And the switching device has simple structure and is convenient to control.
In the invention, automatic back-flushing filters are respectively arranged on a water supply pipe of the residual heat water and a water return pipe of the terminal heat exchange device and are used for filtering impurities in water and preventing the impurities from blocking pipelines.
In the invention, the constant pressure device is arranged on the water return pipe of the terminal heat exchange device, and when the pressure is smaller than a set value, water is supplemented to the water return pipe of the terminal heat exchange device through the constant pressure device so as to enable the pressure to reach the set value. When the pressure is greater than the set value, the pressure is released through the constant pressure device, so that the pressure reaches the set value, the pressure of the whole heat exchange system is constant, and the pressure instability of the system caused by sudden start and stop of equipment is prevented.
Drawings
FIG. 1: in the specific embodiment, the waste heat utilization system is based on an electric drive water source heat pump unit;
[ description of reference ]
A. A first bridge conduit; B. a second bridge conduit; 1. electrically driving the water source heat pump unit; 2. a primary pump; 3. a secondary pump; 4. a constant pressure device; 5. a terminal heat exchange device; 6. a residual heat water supply pipe; 7. a first residual hot water return pipe; 8. a second residual hot water return pipe; 9. a cooling tower; 10. a circulating water inlet pipe; 11. a circulating water return pipe; 12. a water return pipe of the terminal heat exchange device; 13. a water inlet pipe of the terminal heat exchange device; 14/15/16/17/18/19/20/21, electric gate valve; 22/23/24, electric butterfly valve; 25. a first automatic backwash filter; 26. a first temperature sensor; 27. a flow sensor; 28. a unit; 29. a first heat exchange means; 30. a second heat exchange means; 31. a first pipeline; 32. a second pipeline; 33. a third pipeline; 34. a fourth pipeline; 35. a control center; 36. a water circulating pump; 37. a second automatic backwash filter; 38. a second temperature sensor; 39. a water collector.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, the embodiment provides a waste heat utilization system based on an electric drive water source heat pump unit, which includes a control center 35, and a power plant circulating water system, an electric drive water source heat pump unit 1 and a terminal heat exchange device 5 which are in communication connection with the control center 35.
Specifically, a power plant circulating water system, a residual heat water supply pipe 6, an electrically driven water source heat pump unit 1 and a residual heat water return pipe 7 are sequentially connected end to form a first circulation loop. The terminal heat exchange device 5, the terminal heat exchange device water return pipe 12, the electric drive water source heat pump unit 1 and the terminal heat exchange device water inlet pipe 13 are sequentially connected end to form a second circulation loop. The electrically driven water source heat pump unit 1 comprises a first heat exchange device 29 and a second heat exchange device 30, the first heat exchange device 29 and the second heat exchange device 30 are switched through a switching device, and the control center 35 controls the switching device to act so that the first heat exchange device 29 and the second heat exchange device 30 are switched into different circulation loops. During the heating period, the control center 35 controls the switching device to connect the first heat exchanging device 29 to the second circulation circuit and to connect the second heat exchanging device 30 to the first circulation circuit. The waste heat water of the power plant is delivered to the second heat exchange device 30 through the power plant circulating water system, and flows back to the power plant circulating water system after being cooled by the second heat exchange device 30, and the released heat is transmitted to the first heat exchange device 29. The circulating water of the terminal heat exchange device 5 is pumped into the first heat exchange device 29 from the terminal heat exchange device 5 through the primary pump 2, the circulating water of the terminal heat exchange device 5 absorbs the heat of the first heat exchange device 29 and then is heated, the circulating water is pumped into the terminal heat exchange device 5 through the secondary pump 3, the terminal heat exchange device 5 is arranged in a factory area or a residential area, the high-temperature circulating water in the terminal heat exchange device 5 exchanges heat with the indoor air of the factory area and the indoor air of the residential area, and therefore heating of the factory area or the residential area is achieved. During the cooling period, the control center 35 controls the switching device to connect the second heat exchanging device 30 to the second circulation circuit and to connect the first heat exchanging device 29 to the first circulation circuit. Correspondingly, high-temperature circulating water of the terminal heat exchange device 5 is pumped into the second heat exchange device 30 from the terminal heat exchange device 5 through the primary pump 2, and is pumped into the terminal heat exchange device 5 through the secondary pump 3 after being cooled by the second heat exchange device 30, and low-temperature circulating water in the terminal heat exchange device 5 exchanges heat with indoor air of a plant area or a residential area to absorb heat in the air, so that the cooling effect is achieved, and the purpose of refrigerating the plant area or the residential area is achieved. In the embodiment, the electrically driven water source heat pump unit 1 is selected, and the electric drive replaces the steam drive, so that the heat pump unit can be widely applied to southern regions of China, and the problem that the waste heat of thermal power plants in southern regions cannot be effectively utilized is solved. The electrically driven water source heat pump unit 1 realizes the switching between the heating mode and the refrigerating mode through the switching device, realizes the refrigeration in summer and realizes the heating in winter so as to adapt to the requirements in different seasons. And the control center 35 controls the action of the switching device, so that automatic control is realized, the automation degree is high, and the application range is wider.
Further, the switching device in this embodiment includes a first bridge pipeline a and a second bridge pipeline B. The first bridge type pipeline A is connected to the first end of the electric drive water source heat pump unit 1, and the second bridge type pipeline B is connected to the second end of the electric drive water source heat pump unit 1. Wherein the first end is the residual heat water supply end of the electric drive water source heat pump unit 1, and the second end is the residual heat water return end of the electric drive water source heat pump unit 2. One end of the first bridge pipeline B is communicated with a circulating water system of a power plant through a waste heat water supply pipe 6, and the other end of the first bridge pipeline B is communicated with a terminal heat exchange device 5 through a terminal heat exchange device water inlet pipe 13. One end of the second bridge pipeline B is communicated with a circulating water system of the power plant through a waste heat water return pipe, and the other end of the second bridge pipeline B is communicated with the terminal heat exchange device 5 through a terminal heat exchange device water return pipe 12.
In particular, the first bridge circuit a comprises a first circuit 31 and a second circuit 32 connected in parallel, and the second bridge circuit B comprises a third circuit 33 and a fourth circuit 34 connected in parallel. The first pipeline 31 is provided at both ends thereof with a control valve 14 and a control valve 15, respectively, the second pipeline 32 is provided at both ends thereof with a control valve 16 and a control valve 17, respectively, the third pipeline 33 is provided at both ends thereof with a control valve 18 and a control valve 19, respectively, and the fourth pipeline 34 is provided at both ends thereof with a control valve 20 and a control valve 21, respectively. All control valves are communicatively connected to the control center 35. The second heat exchange means 30 has both ends communicating with the first pipe line 31 and the third pipe line 33, respectively, and the first heat exchange means 29 has both ends communicating with the second pipe line 32 and the fourth pipe line 34, respectively. The control valve in this embodiment is preferably an electric gate valve, and the opening and closing of the electric gate valve are controlled by the control center 35, so that the first heat exchanging device 29 and the second heat exchanging device 30 are connected to different circulation loops. The switching device has simple structure and is convenient to control.
The power plant circulating water system in the embodiment comprises a unit 28 and a cooling tower 9, wherein the cooling tower 9, a circulating water inlet pipe 10, the unit 28 and a circulating water return pipe 11 are sequentially connected end to form a circulating water loop, and the unit 28 is cooled. Wherein, the residual heat water supply pipe 6 is communicated with the circulating water inlet pipe 10, a circulating water pump 36 is arranged on the circulating water inlet pipe 10, and the circulating water is pumped into the residual heat water supply pipe 6 through the circulating water pump 36. The waste hot water return pipe comprises a first waste hot water return pipe 7 and a second waste hot water return pipe 8, the first waste hot water return pipe 7 is communicated with the circulating water return pipe 11, and the second waste hot water return pipe 8 is communicated with the cooling tower 9. The connection side of the waste heat water supply pipe 6 and the circulating water inlet pipe 10 is provided with an electric butterfly valve 22, the connection side of the first waste heat water return pipe 7 and the circulating water return pipe 11 is provided with an electric butterfly valve 23, and the connection side of the second waste heat water return pipe 8 and the cooling tower is provided with an electric butterfly valve 24. All the electric butterfly valves are in communication connection with the control center 35, and the control center 35 controls the opening and closing of the electric butterfly valves. When the lift of the circulating water pump is enough, the control center 35 controls the electric butterfly valve 23 to be opened, controls the electric butterfly valve 24 to be closed, and enables residual hot water in the residual hot water return pipe to flow back to the circulating water return pipe 11. When the lift of the circulating water pump is insufficient, the control center 35 controls the electric butterfly valve 23 to be closed, controls the electric butterfly valve 24 to be opened, and enables residual hot water in the residual hot water return pipe to flow back to the water collecting tank of the cooling water tower.
Further, a first automatic backwashing filter 25 is arranged on the terminal heat exchange device water return pipe 12, and a first temperature sensor 26 and a flow sensor 27 are sequentially arranged between the first automatic backwashing filter 25 and the terminal heat exchange device 5. The residual heat water supply pipe 6 is provided with a second automatic backwashing filter 37, and a second temperature sensor 38 is provided between the residual heat water supply pipe 6 and the electric butterfly valve. The first automatic backwashing filter 25, the second automatic backwashing filter 37, the first temperature sensor 26, the second temperature sensor 38 and the electric butterfly valve are in communication connection with the control center 35. The second automatic backwashing filter 37 is used for filtering impurities in the residual heat water supply pipe 6, and the first automatic backwashing filter 25 is used for filtering impurities in the terminal heat exchange device water return pipe 12, so that the residual heat water supply pipe 6 and the terminal heat exchange device water return pipe 12 are prevented from being blocked by the impurities, and later maintenance is facilitated.
Further, a constant pressure device 4 is arranged between the first automatic backwashing filter 25 and the primary pump 2, and the constant pressure device 4 is in communication connection with the control center 35. The constant pressure device 4 is used for setting the pressure of the waste heat utilization system, and the specific pressure value is set according to the specific conditions of the factory area and the living area. Because the water temperature change of the heat exchange system causes volume expansion and contraction, and equipment is suddenly started and stopped, the system pressure is not constant, and the use effect is influenced. The constant pressure device 4 has an exhaust function and a water supplementing function, when the pressure is larger than a set value, gas in the pipeline is exhausted through an exhaust valve, and water in a water return pipe of the terminal heat exchange device 5 is exhausted into the tank body for pressure reduction, so that the pressure in the terminal heat exchange device 5 is the set value. When the pressure is less than the set value, the constant pressure pump pumps water from the automatic pipe body for supplement so as to enable the pressure to reach the set value. Thereby making the pressure in the terminal heat exchange means 5 constant.
The electrically driven water source heat pump unit 1 in this embodiment is an apparatus capable of performing cooling and heating using water as a heat source or a cold source, and is an integrated apparatus integrating a first heat exchanging device 29, a compressor, and a second heat exchanging device 30, where the first heat exchanging device 29 is a condenser, and the second heat exchanging device 30 is an evaporator, and has cooling and heating functions. The specific working principle is as follows:
in the cooling mode, high pressure, high temperature refrigerant gas from the compressor enters the water/refrigerant condenser, discharges heat into the water to cool it into a high pressure liquid and raise the temperature of the water. The liquid enters the evaporator to be evaporated into low-pressure steam after being throttled and expanded into low-pressure liquid by the thermal expansion valve, and simultaneously absorbs the heat of air (water). The low-pressure refrigerant vapor enters the compressor again to be compressed into high-pressure gas, and the circulation is not performed. Chilled water required for a refrigerated environment is obtained in the evaporator.
In the heating mode, high-pressure and high-temperature refrigerant gas is pressed out from the compressor, enters the condenser and simultaneously discharges heat to be cooled into high-pressure liquid, is throttled and expanded by the thermal expansion valve to form low-pressure liquid, enters the evaporator and is evaporated into low-pressure steam, and the water is cooled by absorbing the heat in the water in the evaporation process. The low-pressure refrigerant vapor enters the compressor again to be compressed into high-pressure gas, and the circulation is not performed. The hot water required for the heating environment is obtained in the condenser.
The terminal heat exchange device 5 in this embodiment is a pipeline laid in an office building or a residential building of a factory, the pipeline is coiled and laid on indoor ground or wall, and water in the pipeline exchanges heat with indoor air, so that the purposes of heating and refrigerating are achieved. Correspondingly, a water collector 39 is arranged at the end of the pipeline, and water in the water collector 39 is pumped into the electrically driven water source heat pump unit 1 through the primary pump 2.
Adopt the electric drive heat pump set based on waste heat utilization system's of this embodiment heating and refrigerated specific work engineering do:
in the summer refrigeration working condition, when the original circulating water pump 36 has enough lift, the electric gate valves 15, 16, 19 and 20 and the electric butterfly valves 22 and 23 are opened through the control center 35, the electric gate valves 14, 17, 18 and 21 and the electric butterfly valve 24 are closed, circulating water in the terminal heat exchange device 5 is collected to the water collector 39 and then is pressurized by the primary pump 22 to enter the electric drive water source heat pump unit 1, and circulating water in the terminal heat exchange device 5 is pumped into the terminal heat exchange device 5 by the secondary pump 33 after being subjected to heat exchange and temperature reduction through the electric drive heat pump unit 1, so that the effect of providing cold source refrigeration is achieved. At the moment, the residual hot water supply comes from the main machine circulating water inlet pipe 10, and the residual hot water enters the main machine circulating water return pipe 11 through the first residual hot water return pipe 7 after absorbing heat and raising temperature through the electrically driven heat pump unit 1. When the lift of the circulating water pump 36 is insufficient, the electric butterfly valve 23 is closed, the electric butterfly valve 24 is opened, and the residual hot water directly enters the lower end water collecting tank of the cooling tower 9 through the second residual hot water return pipe 8.
In the winter heating condition, the control center 35 opens the electric gate valves 14, 17, 18 and 21 and the electric butterfly valves 22 and 24, and closes the electric gate valves 15, 16, 19 and 20 and the electric butterfly valve 23. Circulating water of the terminal heat exchange device 5 in the water collector 37 is pressurized by the primary pump 22 and enters the electric drive water source heat pump unit 1, and circulating water of the terminal heat exchange device 5 absorbs heat and is heated by the electric drive heat pump unit 1 and then is pumped into the terminal heat exchange device 5 by the secondary pump 33, so that a heat source heating effect is achieved. At the moment, the residual hot water is supplied from a main machine circulating water inlet pipe 10, and directly enters a collecting tank at the lower end of a cooling tower 9 through a residual hot water return pipe 7 after the residual hot water is subjected to heat exchange and temperature reduction through an electrically driven water source heat pump unit 1.
By adopting the waste heat utilization system of the electrically driven water source heat pump unit, a cold source with the temperature of 12 ℃/7 ℃ can be provided in summer, and a heat source with the temperature of 48 ℃/53 ℃ can be provided in winter. In the summer operation condition, the temperature of the residual hot water inlet of the electrically driven water source heat pump unit 1 is 33 ℃, the residual hot water is taken from a circulating water system of a power plant, when the lift of the circulating water pump 36 is enough, the residual hot water is connected to the circulating water return pipe 11 through the first residual hot water return pipe 7, and the return water temperature is about 38 ℃. When the lift of the circulating water pump 36 is insufficient, the residual hot water flows back to the lower end collecting tank of the cooling tower 9 through the residual hot water return pipe 8. Under the working condition of winter operation, the inlet temperature of the residual heat water of the electrically driven water source heat pump unit 1 is 22 ℃, the residual heat water is cooled by the electrically driven water source heat pump unit 1 and then flows back to the water collecting tank below the cooling tower 9, and the return water temperature is about 12 ℃. The electrically driven water source heat pump unit 1 utilizes a large amount of low-grade energy, improves the energy grade through lower cost, and meets the requirements of people on life and production.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention.
Claims (10)
1. A waste heat utilization system based on an electrically driven water source heat pump unit is characterized by comprising a control center (35), a power plant circulating water system, the electrically driven water source heat pump unit (1) and a terminal heat exchange device (5), wherein the power plant circulating water system is in communication connection with the control center (35);
the power plant circulating water system and the electric drive water source heat pump unit (1) are connected end to end through pipelines to form a first circulating loop;
the terminal heat exchange device (5) is connected with the electrically-driven water source heat pump unit (1) end to end through a pipeline to form a second circulation loop;
the electric drive water source heat pump unit (1) comprises a first heat exchange device (29) and a second heat exchange device (30), the first heat exchange device (29) and the second heat exchange device (30) are switched through a switching device, and the switching device is in communication connection with the control center (35); wherein the content of the first and second substances,
the switching device selectively connects the first heat exchange device (29) to the second circulation circuit and the second heat exchange device (30) to the first circulation circuit or connects the second heat exchange device (30) to the second circulation circuit and the first heat exchange device (29) to the first circulation circuit by the control of the control center (35).
2. The waste heat utilization system based on the electrically driven water source heat pump unit as claimed in claim 1, wherein the switching device comprises a first bridge type pipeline (A) and a second bridge type pipeline (B);
the first bridge type pipeline (A) is connected to a first end of the electric drive water source heat pump unit (1), and the second bridge type pipeline (B) is connected to a second end of the electric drive water source heat pump unit (1);
the first end is the water supply end of the waste heat water, and the second end is the water return end of the waste heat water.
3. The waste heat utilization system based on the electrically driven water source heat pump unit as claimed in claim 2, wherein both ends of the first bridge pipeline (A) are respectively connected with a waste heat water supply pipe (6) and a terminal heat exchange device water inlet pipe (13);
the first bridge pipeline (A) is connected with the circulating water system of the power plant through the residual heat water supply pipe (6) and is connected with the terminal heat exchange device (5) through the terminal heat exchange device water inlet pipe (13);
both ends of the second bridge type pipeline (B) are respectively connected with a waste hot water return pipe and a terminal heat exchange device return pipe (12);
and the second bridge pipeline (B) is connected with the circulating water system of the power plant through the residual heat water return pipe, and is connected with the terminal heat exchange device (5) through the terminal heat exchange device water return pipe (12).
4. The waste heat utilization system based on the electrically driven water source heat pump unit is characterized in that the first bridge type pipeline (A) comprises a first pipeline (31) and a second pipeline (32) which are connected in parallel, and the second bridge type pipeline (B) comprises a third pipeline (33) and a fourth pipeline (34) which are connected in parallel;
electric gate valves are respectively arranged at two ends of the first pipeline (31), the second pipeline (32), the third pipeline (33) and the fourth pipeline (34), and the electric gate valves are in communication connection with the control center (35);
two ends of the first heat exchange device (29) are respectively communicated with the first pipeline (31) and the third pipeline (33), and two ends of the second heat exchange device (30) are respectively communicated with the second pipeline (32) and the fourth pipeline (34).
5. The waste heat utilization system based on the electrically driven water source heat pump unit is characterized in that the power plant circulating water system comprises a unit (28) and a cooling tower (9), wherein the cooling tower (9), a circulating water inlet pipe (10), the unit (28) and a circulating water return pipe (11) are sequentially connected end to end;
the residual heat water supply pipe (6) is communicated with the circulating water inlet pipe (10);
the waste heat water return pipe comprises a first waste heat water return pipe (7) and a second waste heat water return pipe (8), the first waste heat water return pipe (7) is communicated with the circulating water return pipe (11), and the second waste heat water return pipe (8) is communicated with the cooling tower (9).
6. The waste heat utilization system based on the electrically driven water source heat pump unit as claimed in claim 5, wherein the connection side of the waste heat water supply pipe (6) and the circulating water inlet pipe (10), the connection side of the first waste heat water return pipe (7) and the circulating water return pipe (11), and the connection side of the second waste heat water return pipe (8) and the cooling tower (9) are respectively provided with an electric butterfly valve;
the electric butterfly valve is in communication connection with the control center (35).
7. The waste heat utilization system based on the electrically driven water source heat pump unit as claimed in claim 6,
a first automatic backwashing filter (25) is arranged on the terminal heat exchange device water return pipe (12), and a first temperature sensor (26) and a flow sensor (27) are sequentially arranged between the first automatic backwashing filter (25) and the terminal heat exchange device (5);
a second automatic backwashing filter (37) is arranged on the residual heat water supply pipe (6), and a second temperature sensor (38) is arranged between the residual heat water supply pipe (6) and the electric butterfly valve;
the first automatic backwashing filter (25), the second automatic backwashing filter (37), the first temperature sensor (26), the second temperature sensor (38) and the electric butterfly valve are all in communication connection with the control center (35).
8. The waste heat utilization system based on the electrically driven water source heat pump unit as claimed in claim 7, characterized by further comprising a primary pump (2) and a secondary pump (3);
the primary pump (2) is arranged on the terminal heat exchange device water return pipe (12), and the secondary pump (3) is arranged on the terminal heat exchange device water inlet pipe (13);
a constant pressure device (4) is arranged between the first automatic backwashing filter (25) and the primary pump (2);
the constant pressure device (4) is in communication connection with the control center (35).
9. The waste heat utilization system based on the electrically driven water source heat pump unit according to claim 1, characterized in that the electrically driven water source heat pump unit (1) is an integrated device and further comprises a compressor;
the first heat exchange device (29) is a condenser, and the second heat exchange device (30) is an evaporator.
10. A waste heat utilization method by using the waste heat utilization system based on the electrically driven water source heat pump unit according to any one of claims 1 to 10,
a heating period:
the switching device connects the first heat exchange device (29) into the second circulation loop and connects the second heat exchange device (30) into the first circulation loop through the control of the control center (35);
the residual heat water is conveyed to the second heat exchange device (30) from the power plant circulating water system, and flows back to the power plant circulating water system after being cooled by the second heat exchange device (30);
circulating water of the terminal heat exchange device (5) is conveyed to the first heat exchange device (29) by the terminal heat exchange device (5) through the primary pump, and is pumped into the terminal heat exchange device (5) by the secondary pump after being heated by the first heat exchange device (29);
and (3) during the refrigeration period:
the switching device connects the second heat exchange device (30) into the second circulation loop and connects the first heat exchange device (29) into the first circulation loop by the control of the control center (35);
the residual heat water is conveyed to the first heat exchange device (29) from the power plant circulating water system, and flows back to the power plant circulating water system after being heated by the first heat exchange device (29);
and circulating water of the terminal heat exchange device (5) is pumped into the second heat exchange device (30) by the terminal heat exchange device (5) through the primary pump (2), and is pumped into the terminal heat exchange device (5) by the secondary pump (3) after being cooled by the second heat exchange device (30).
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| CN202011057737.9A CN112178980B (en) | 2020-09-29 | 2020-09-29 | Waste heat utilization system and method based on electrically driven water source heat pump unit |
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| JPS62107209A (en) * | 1985-11-01 | 1987-05-18 | Hitachi Ltd | Auxiliary equipment cooling water system for thermoelectric power plant |
| JP2002227160A (en) * | 2000-11-29 | 2002-08-14 | Kubota Corp | Snow melting facility |
| CN202109702U (en) * | 2011-06-23 | 2012-01-11 | 河北省电力勘测设计研究院 | Water source heat pump system of thermal power plant |
| CN204373118U (en) * | 2014-11-30 | 2015-06-03 | 中国能源建设集团山西省电力勘测设计院 | The heating and air-conditioning system that thermal power plant electric heat pump and steam-operating heat pump combine |
| CN207113284U (en) * | 2017-09-04 | 2018-03-16 | 聂宏国 | A kind of thermoelectric cycle water or industrial wastewater afterheat utilizing system |
-
2020
- 2020-09-29 CN CN202011057737.9A patent/CN112178980B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62107209A (en) * | 1985-11-01 | 1987-05-18 | Hitachi Ltd | Auxiliary equipment cooling water system for thermoelectric power plant |
| JP2002227160A (en) * | 2000-11-29 | 2002-08-14 | Kubota Corp | Snow melting facility |
| CN202109702U (en) * | 2011-06-23 | 2012-01-11 | 河北省电力勘测设计研究院 | Water source heat pump system of thermal power plant |
| CN204373118U (en) * | 2014-11-30 | 2015-06-03 | 中国能源建设集团山西省电力勘测设计院 | The heating and air-conditioning system that thermal power plant electric heat pump and steam-operating heat pump combine |
| CN207113284U (en) * | 2017-09-04 | 2018-03-16 | 聂宏国 | A kind of thermoelectric cycle water or industrial wastewater afterheat utilizing system |
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| CN112178980B (en) | 2022-03-11 |
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Address after: Room 217-7, 1158 Xiehe Road, Changning District, Shanghai 200335 Patentee after: Guoneng Longyuan Lantian Energy Saving Technology Co.,Ltd. Shanghai Branch Address before: Room 217-7, 1158 Xiehe Road, Changning District, Shanghai 200335 Patentee before: Guodian Longyuan Energy Saving Technology Co.,Ltd. Shanghai Branch |
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