CN113188108A - Efficient heat pump and control use method - Google Patents
Efficient heat pump and control use method Download PDFInfo
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- CN113188108A CN113188108A CN202110454208.0A CN202110454208A CN113188108A CN 113188108 A CN113188108 A CN 113188108A CN 202110454208 A CN202110454208 A CN 202110454208A CN 113188108 A CN113188108 A CN 113188108A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 374
- 239000000498 cooling water Substances 0.000 claims abstract description 56
- 238000001704 evaporation Methods 0.000 claims abstract description 46
- 230000008020 evaporation Effects 0.000 claims abstract description 46
- 238000010521 absorption reaction Methods 0.000 claims abstract description 27
- 230000001502 supplementing effect Effects 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 137
- 239000006096 absorbing agent Substances 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 17
- 239000010865 sewage Substances 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000013589 supplement Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000004378 air conditioning Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007701 flash-distillation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000029142 excretion Effects 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
- F22D5/26—Automatic feed-control systems
-
- 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
- F25B30/04—Heat pumps of the sorption type
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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
- F25B37/00—Absorbers; Adsorbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention belongs to the technical field of air conditioning equipment, and discloses a high-efficiency heat pump and a control and use method. The intelligent control system comprises an absorption heat pump, a first-stage flash tank, a second-stage flash tank, a heat source water circulating pump, a heat source water three-way valve, a heat source water two-way valve, a water supplementing control valve, a steam control valve A, a steam control valve B, an intelligent control system, a cooling water regulating valve, a structure and a flow of heat source water subsection cooling and flash tank two-stage flash evaporation, high-efficiency utilization of heat source water cascade is achieved, the output of steam is improved, cooling water is regulated and controlled by the cooling water regulating valve, optimal regulation is carried out on cooling water flow entering a unit, heat taken away by cooling water is reduced, energy-saving control is achieved through the absorption heat pump, heat exchange efficiency of the unit is improved, energy waste is avoided, meanwhile, the intelligent control system is adopted for regulation and multiple protection setting, stable operation of the unit is guaranteed, and intelligent control of the unit is achieved.
Description
Technical Field
The invention belongs to the technical field of air conditioning equipment, and relates to a high-efficiency heat pump and a control and use method.
Background
In the production process, a large amount of high-temperature steam is needed, and meanwhile, a large amount of low-temperature waste heat resources are provided, and the absorption heat pump unit is adopted to extract low-temperature waste heat, so that the high-temperature steam can be prepared, the consumption of high-grade heat sources can be saved, and a large amount of application is obtained in recent years. By adopting the structure, the flow and the control technology of the conventional absorption heat pump, the prepared steam quantity cannot be greatly improved, how to improve the heat exchange efficiency of the heat pump unit can be realized, the absorption heat pump can operate efficiently and stably, a large amount of steam with constant pressure is prepared, meanwhile, the pressure and the liquid level in the flash tank are ensured to be stable by adopting effective control, and the prevention of the fluctuation of the steam pressure and the yield becomes one of important subjects of current research.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-efficiency heat pump and a control and use method thereof, which adopt a structure and a flow of heat source water subsection cooling and flash tank two-stage flash evaporation to realize the high-efficiency utilization of heat source water cascade and improve the output of steam, adopt a cooling water regulating valve to regulate and control cooling water, optimally regulate the flow of the cooling water entering a unit to reduce the heat taken away by the cooling water from a heat source, improve the heat exchange efficiency of the unit through the energy-saving control of an absorption heat pump, avoid the waste of energy, adopt an intelligent control system to regulate and carry out multiple protection settings, ensure the stable operation of the unit and realize the intelligent control of the unit.
The above purpose of the invention is realized by the following technical scheme:
a high-efficiency heat pump comprises an absorption heat pump, a primary flash tank, a secondary flash tank, a heat source water circulating pump, a heat source water three-way valve, a heat source water two-way valve, a water supplementing control valve, a steam control valve A, a steam control valve B, an intelligent control system and a cooling water regulating valve, wherein the absorption heat pump consists of an absorber, an evaporator, a condenser and a regenerator; a pressure sensor A, a differential pressure transmitter A and a safe drainage device A are arranged on the primary flash tank; and a pressure sensor B, a differential pressure transmitter B and a safe drainage device B are arranged on the secondary flash tank. The top of the primary flash tank is connected with a steam pipeline A, and a steam control valve A is arranged on the steam pipeline A; the top of the secondary flash tank is connected with a steam pipeline B, and a steam control valve B is arranged on the steam pipeline B; the steam pipeline A and the steam pipeline B are converged and connected to a steam outlet pipeline, and a one-way valve is arranged on the steam outlet pipeline. A heat source water inlet pipeline is arranged on the side wall of the middle part of the primary flash tank, a heat source water pipeline A is arranged at the bottom of the primary flash tank, a heat source water pipeline B is connected between the heat source water inlet pipeline and the heat source water pipeline A, and a heat source water two-way valve is arranged on the heat source water pipeline B; a heat source water circulating pump is arranged on the heat source water pipeline A, a variable frequency controller is arranged on the heat source water circulating pump, the heat source water circulating pump is connected with an evaporator through a heat source water pipeline C, the evaporator is connected with a regenerator through a pipeline, a heat pump heat source water outlet pipeline is arranged at a heat source water outlet of the regenerator, a heat pump heat source water outlet temperature sensor and a heat source water three-way valve are arranged on the heat pump heat source water outlet pipeline, the heat source water three-way valve is respectively connected with a heat source water bypass pipeline and the heat source water outlet pipeline, and the heat source water bypass pipeline is connected with the heat source water pipeline C. The condenser is connected with a cooling water inlet pipeline and a cooling water outlet pipeline, and a cooling water regulating valve is arranged on the cooling water inlet pipeline. The absorber is connected with the secondary flash tank through a heat pump circulating hot water inlet pipeline and a heat pump circulating hot water outlet pipeline, the heat pump circulating hot water inlet pipeline is connected with a water supplementing pipeline, a water supplementing control valve is arranged on the water supplementing pipeline, and a heat pump circulating hot water outlet temperature sensor is arranged on the heat pump circulating hot water outlet pipeline.
Further, preferably, an integrated structure of the flash tank and the heat pump absorber is provided, the absorber comprises a sensible heat temperature rise region heat exchange tube, a latent heat flash region heat exchange tube, a low-temperature circulating hot water tank, a high-temperature circulating hot water tank and a steam flash tank, wherein a water replenishing interface is arranged at the lower part of the low-temperature circulating hot water tank and is used for replenishing water for the low-temperature circulating hot water tank and the secondary flash tank; and a drainage valve is arranged at the bottom of the low-temperature circulating hot water tank and is used for draining water during unit maintenance. The secondary flash tank comprises a steam storage area, a circulating hot water storage area and a sewage impurity storage area, wherein a low-resistance corrugated plate is arranged in the steam storage area, the low-resistance corrugated plate is used for blocking water and ventilating steam, preventing circulating hot water from entering a steam system and reducing the humidity of output steam, meanwhile, the low resistance does not influence the flow of the steam, and a pressure sensor B, a safe excretion device B and a steam outlet are arranged at the upper part of the steam storage area; a sewage discharge valve is arranged at the bottom of the sewage impurity storage area and is used for discharging impurities in the circulating hot water during maintenance; steam storage area is connected with pipeline A, and circulation hot water storage area is connected with pipeline B, connects differential pressure transmitter B between pipeline A and the pipeline B, sets up stop valve A and stop valve B on pipeline A and the pipeline B respectively, can turn off stop valve A and stop valve B when differential pressure transmitter B need overhaul or change, can not influence unit normal operating.
The secondary flash tank is arranged at the upper part of the low-temperature circulating hot water tank and is connected through a low-temperature circulating hot water pipeline, and the low-temperature circulating hot water pipeline is inserted into the circulating hot water storage area above the sewage impurity storage area, so that impurities in the sewage impurity storage area are prevented from entering an absorber to scratch a heat exchange pipe or form scales on the surface of the heat transfer pipe to influence heat exchange; the low-temperature circulating hot water tank and the sensible heat heating area heat exchange tube form a sensible heat heating area, the low-temperature circulating hot water is heated by solution dispersed in an absorber in the sensible heat heating area heat exchange tube to be heated, and the heated circulating hot water enters the high-temperature circulating hot water tank; the latent heat flash evaporation zone heat exchange tube and the steam flash evaporation box form a latent heat flash evaporation zone, the sensible heat warming zone and the latent heat flash evaporation zone are connected through a high-temperature circulating hot water tank, the high-temperature circulating hot water is heated by solution dispersed in the absorber in the latent heat flash evaporation zone heat exchange tube to be warmed again, and part of circulating hot water is subjected to primary flash evaporation in the latent heat flash evaporation zone heat exchange tube and the steam flash evaporation box in the warming process; the heat transfer areas of the heat exchange tubes in the sensible heat heating area and the latent heat flash evaporation area are different, so that sensible heat heating and latent heat flash evaporation are facilitated; the steam flash evaporation tank is connected with the secondary flash evaporation tank through a steam-water circulation pipeline, the steam-water circulation pipeline is inserted into the steam storage area, and the steam-water circulation pipeline inserted into the steam storage area is bent downwards, so that the phenomenon that liquid drops of steam-water mixture entering the secondary flash evaporation tank splash upwards in the secondary flash evaporation process is avoided.
The absorption heat pump, the heat source water three-way valve, the heat source water two-way valve, the water supplementing control valve, the steam control valve A, the steam control valve B, the cooling water adjusting valve, the heat pump heat source water outlet temperature sensor, the heat pump circulating hot water outlet temperature sensor, the pressure sensor A, the differential pressure transmitter A, the pressure sensor B, the differential pressure transmitter B and the frequency conversion controller are respectively connected with the intelligent control system.
The intelligent control system is connected with the absorption heat pump to realize energy-saving control; the intelligent control system is respectively connected with a pressure sensor A and a differential pressure transmitter A of the primary flash tank to realize pressure control and differential pressure feedback liquid level control; the intelligent control system is respectively connected with a pressure sensor B and a differential pressure transmitter B of the secondary flash tank to realize pressure control and differential pressure feedback liquid level control; the intelligent control system and the heat source water circulating pump are connected with a variable frequency controller to realize variable frequency feedback control; the intelligent control system is connected with the heat source water three-way valve to realize heat source water bypass control; the intelligent control system is connected with the heat source water two-way valve to realize heat source water regulation control; the intelligent control system is connected with the water replenishing control valve to realize water replenishing regulation control; the intelligent control system is respectively connected with the steam control valve A and the steam control valve B to realize the regulation control of the steam control valve; the intelligent control system is connected with the cooling water regulating valve to realize the regulation and control of the cooling water; the intelligent control system is respectively connected with the heat pump heat source water outlet temperature sensor and the heat pump circulating hot water outlet temperature sensor to realize heat source water outlet temperature control and heat source water input control.
The intelligent control system is specifically a PLC system.
Compared with the prior art, the invention has the beneficial effects that:
the heat source water is subjected to first temperature reduction in the first-stage flash tank, is subjected to second temperature reduction in the evaporator and is subjected to third temperature reduction in the regenerator, so that the cascade high-efficiency utilization of the heat source water is realized, meanwhile, the high-temperature heat source water is subjected to first-stage flash evaporation in the first-stage flash tank to output steam, the low-temperature heat source water is subjected to heat extraction in the evaporator and the regenerator of the absorption heat pump to heat circulating hot water, the heat circulating hot water is subjected to second-stage flash evaporation in the second-stage flash tank to output steam, and the output quantity of the steam is improved; the cooling water regulating valve is adopted to regulate and control the cooling water, the cooling water flow entering the unit is optimally regulated, the heat quantity taken away by the cooling water from a heat source is reduced, meanwhile, the reasonable regulation of the solution circulation quantity and the refrigerant circulation quantity in the unit is realized through the energy-saving control of the absorption heat pump, the heat exchange efficiency of the unit is improved, and the energy waste is avoided. Carry out integral type structure with absorber and second grade flash tank and arrange, make circulating hot water sensible heat intensification and latent heat flash distillation combine together in the absorber, unit heat exchange efficiency obtains promoting by a wide margin, and absorber and second grade flash tank all can reduce heat transfer area, have saved the processing material, have reduced the occupation of land space of unit. The regulation control of the heat source water circulating pump, the heat source water two-way valve and the steam control valve A is carried out according to the pressure and the liquid level fed back by the pressure sensor A and the differential pressure transmitter A of the primary flash tank, so that the stable regulation of the liquid level of the primary flash tank, the alarm protection of low liquid level, the bypass protection of high liquid level, the turn-off protection of the ultrahigh liquid level steam control valve A and the smooth starting and stable regulation of the steam control valve A are realized; the regulation control of the steam control valve B and the water supplement control valve is carried out according to the pressure and the liquid level fed back by the pressure sensor B and the differential pressure transmitter B of the secondary flash tank, so that the stable regulation of the liquid level of the secondary flash tank, the low liquid level alarm protection, the turn-off protection of the high liquid level steam control valve B, the smooth starting and the stable regulation of the steam control valve B and the water supplement control valve are realized; the heat source water three-way valve carries out PID dual regulation control according to the outlet temperature of the heat pump heat source water and the outlet temperature of the heat pump circulating hot water, on one hand, the influence on production caused by the excessively low outlet temperature of the heat pump heat source water is prevented, low-temperature protection is realized, on the other hand, the occurrence of alarm shutdown caused by high unit temperature abnormity or high pressure abnormity due to excessive input of heat source water is prevented, and high-temperature protection is realized. The intelligent control system is adopted for adjustment and multiple protection setting, so that the stable operation of the unit is ensured, and the intelligent control of the unit is realized.
Drawings
Fig. 1 is a schematic structural diagram of a high-efficiency heat pump according to the present invention.
FIG. 2 is a schematic view of the integrated structure of the flash tank and the heat pump absorber.
In the figure, 1, an absorption heat pump, 2, a primary flash tank, 3, a secondary flash tank, 4, a heat source water circulating pump, 5, a heat source water three-way valve, 6, a heat source water two-way valve, 7, a water supplement control valve, 8, a steam control valve A, 9, a steam control valve B, 10, an intelligent control system, 11, a cooling water regulating valve, 12, a heat source water inlet pipeline, 13, heat source water pipelines A, 14, heat source water pipelines B, 15, heat source water pipelines C, 16, a heat pump heat source water outlet pipeline, 17, a heat source water bypass pipeline, 18, a heat source water outlet pipeline, 19, a water supplement pipeline, 20, a heat pump circulating hot water inlet pipeline, 21, a heat pump circulating hot water outlet pipeline, 22, a cooling water inlet pipeline, 23, a cooling water outlet pipeline, 24, a steam pipeline A, 25, a steam pipeline B, 26, a steam outlet pipeline, 27, a heat pump heat source water outlet temperature sensor, 28. a heat pump circulating hot water outlet temperature sensor, 29, a one-way valve, 101, an absorber, 102, an evaporator, 103, a condenser, 104, a regenerator, 201, a pressure sensor A, 202, a differential pressure transmitter A, 203, a safety drainage device A, 301, a pressure sensor B, 302, a differential pressure transmitter B, 303, a safety drainage device B, 304, a steam storage area, 305, a circulating hot water storage area, 306, a sewage impurity storage area, 307, a low-resistance corrugated plate, 308, a steam outlet, 309, a blowdown valve, 310, a pipeline A, 311, a pipeline B, 312, a stop valve A, 313, a stop valve B, 401, a frequency conversion controller, a sensible heat rising temperature area heat exchange pipe, 1012, a flash evaporation area heat exchange pipe, 1013, a low-temperature circulating hot water tank, 1014, a high-temperature circulating hot water tank, 1015, a steam flash tank, 1016, a low-temperature circulating hot water pipeline, 1017, a steam-water circulating pipeline, 1018. water supplement interface 1019 drainage valve.
Detailed Description
The invention is described in more detail below with reference to specific examples, without limiting the scope of the invention. If not specifically stated, the absorption heat pump, the heat source water three-way valve, the heat source water two-way valve, the water supplement control valve, the steam control valve a, the steam control valve B, the cooling water regulating valve, the heat pump heat source water outlet temperature sensor, the heat pump circulating hot water outlet temperature sensor, the pressure sensor a, the differential pressure transmitter a, the pressure sensor B, the differential pressure transmitter B, and the frequency conversion controller connected to the PLC system in the following embodiments are not limited to a specific type, and thus, specific functions thereof may be achieved.
Example 1
A high-efficiency heat pump is shown in figure 1 and comprises an absorption heat pump 1, a primary flash tank 2, a secondary flash tank 3, a heat source water circulating pump 4, a heat source water three-way valve 5, a heat source water two-way valve 6, a water supplementing control valve 7, a steam control valve A8, a steam control valve B9, an intelligent control system 10 and a cooling water regulating valve 11, wherein the absorption heat pump 1 consists of an absorber 101, an evaporator 102, a condenser 103 and a regenerator 104; a pressure sensor A201, a differential pressure transmitter A202 and a safety drainage device A203 are arranged on the primary flash tank 2; and a pressure sensor B301, a differential pressure transmitter B302 and a safety drainage device B303 are arranged on the secondary flash tank 3. The top of the primary flash tank 2 is connected with a steam pipeline A24, and a steam control valve A8 is arranged on a steam pipeline A24; the top of the secondary flash tank 3 is connected with a steam pipeline B25, and a steam control valve B9 is arranged on a steam pipeline B25; the steam line A24 and the steam line B25 are connected to the steam outlet line 26 in a converging manner, and a check valve 29 is arranged on the steam outlet line 26. A heat source water inlet pipeline 12 is arranged on the side wall of the middle part of the primary flash tank 2, a heat source water pipeline A13 is arranged at the bottom of the primary flash tank 2, a heat source water pipeline B14 is connected between the heat source water inlet pipeline 12 and the heat source water pipeline A13, and a heat source water two-way valve 6 is arranged on the heat source water pipeline B14; the heat source water pipeline A13 is provided with a heat source water circulating pump 4, the heat source water circulating pump 4 is provided with a variable frequency controller 401, the heat source water circulating pump 4 is connected with the evaporator 102 through a heat source water pipeline C15, the evaporator 102 is connected with the regenerator 104 through a pipeline, the heat source water outlet of the regenerator 104 is provided with a heat pump heat source water outlet pipeline 16, the heat pump heat source water outlet pipeline 16 is provided with a heat pump heat source water outlet temperature sensor 27 and a heat source water three-way valve 5, the heat source water three-way valve 5 is respectively connected with a heat source water bypass pipeline 17 and a heat source water outlet pipeline 18, and the heat source water bypass pipeline 17 is connected with a heat source water pipeline C15. The condenser 103 is connected to a cooling water inlet line 22 and a cooling water outlet line 23, and the cooling water inlet line 22 is provided with a cooling water regulating valve 11. The absorber 101 is connected with the second-stage flash tank 3 through a heat pump circulating hot water inlet pipeline 20 and a heat pump circulating hot water outlet pipeline 21, the heat pump circulating hot water inlet pipeline 20 is connected with a water supplementing pipeline 19, the water supplementing pipeline 19 is provided with a water supplementing control valve 7, and the heat pump circulating hot water outlet pipeline 21 is provided with a heat pump circulating hot water outlet temperature sensor 28.
The heat source water enters the primary flash tank 2 through the heat source water inlet pipeline 12 and is subjected to flash evaporation due to pressure change, and the steam flashed out enters the steam pipeline A24; the temperature of the heat source water is reduced and then the heat source water is sent into the absorption heat pump 1 through the heat source water circulating pump 4 through the heat source water pipeline A13, the heat of the heat source water is sequentially absorbed by the evaporator 102 and the regenerator 104 in the absorption heat pump 1, and the heat source water returns to the production process after being cooled down through the heat pump heat source water outlet pipeline 16 and the heat source water outlet pipeline 18 in sequence; part of heat source water absorbed by an evaporator 102 and a regenerator 104 of the absorption heat pump 1 is taken away by cooling water in a condenser 103, part of heat source water is absorbed by circulating hot water in an absorber 101, the circulating hot water enters a secondary flash tank 3 through a heat pump circulating hot water outlet pipeline 21 after being heated, flash evaporation is carried out due to pressure change, the steam flashed out enters a steam pipeline B25, and water supplement is carried out through a water supplement pipeline 19; the steam flashed by the first-stage flash tank 2 and the second-stage flash tank 3 is converged and then sent into the production process through the steam outlet pipeline 26, and the one-way valve 29 arranged on the steam outlet pipeline 26 prevents external steam from flowing back to the first-stage flash tank 2 and the second-stage flash tank 3. The heat source water is cooled for the first time in the first-stage flash tank 2, the evaporator 102 is cooled for the second time, and the regenerator 104 is cooled for the third time, so that the gradient high-efficiency utilization of the heat source water is realized, the waste of energy is avoided, meanwhile, the high-temperature heat source water is subjected to first-stage flash evaporation in the first-stage flash tank 2 to output steam, the low-temperature heat source water is subjected to heat extraction in the evaporator 102 and the regenerator 104 of the absorption heat pump 1 to heat circulating hot water, the heat circulating hot water is subjected to second-stage flash evaporation in the second-stage flash tank 3 to output steam, and the output of the steam is improved.
Preferably, a heat pump unit with an integrated structure of a secondary flash tank 3 and an absorber 101 is provided, as shown in fig. 2, the integrated structure of the flash tank and the heat pump absorber is schematically illustrated, the absorber 101 includes a sensible heat temperature rising region heat exchange tube 1011, a latent heat flash region heat exchange tube 1012, a low-temperature circulating hot water tank 1013, a high-temperature circulating hot water tank 1014, and a steam flash tank 1015, wherein a water replenishing interface 1018 is arranged at the lower part of the low-temperature circulating hot water tank 1013 for replenishing water to the low-temperature circulating hot water tank 1013 and the secondary flash tank 3; the bottom of the low-temperature circulating hot water tank 1013 is provided with a drain valve 1019 for draining water during unit maintenance. The secondary flash tank 3 comprises a steam storage area 304, a circulating hot water storage area 305 and a sewage impurity storage area 306, wherein a low-resistance corrugated plate 307 is arranged in the steam storage area 304, the low-resistance corrugated plate 307 is used for blocking water and ventilating steam, so that circulating hot water is prevented from entering a steam system, the humidity of output steam is reduced, meanwhile, the low resistance does not influence the flow of the steam, and a pressure sensor B301, a safety drainage device B303 and a steam outlet 308 are arranged at the upper part of the steam storage area 304; a sewage discharge valve 309 is arranged at the bottom of the sewage impurity storage area 306 and is used for discharging impurities in the circulating hot water during maintenance; the steam storage area 304 is connected with a pipeline A310, the circulating hot water storage area 305 is connected with a pipeline B311, a differential pressure transmitter B302 is connected between the pipeline A310 and the pipeline B311, a stop valve A312 and a stop valve B313 are respectively arranged on the pipeline A310 and the pipeline B311, and the stop valve A312 and the stop valve B313 can be turned off when the differential pressure transmitter B302 needs to be overhauled or replaced, so that the normal operation of the unit cannot be influenced.
The secondary flash tank 3 is arranged at the upper part of the low-temperature circulating hot water tank 1013 and is connected through a low-temperature circulating hot water pipeline 1016, and the low-temperature circulating hot water pipeline 1016 is inserted into the circulating hot water storage area 305 above the sewage impurity storage area 306, so that impurities in the sewage impurity storage area 306 are prevented from entering the absorber 101 to scratch the heat exchange pipe or form scales on the surface of the heat exchange pipe to influence heat exchange; the low-temperature circulating hot water tank 1013 and the sensible heat temperature rise region heat exchange tube 1011 form a sensible heat temperature rise region, the low-temperature circulating hot water is heated by the solution dispersed in the absorber 101 in the sensible heat temperature rise region heat exchange tube 1011 to rise the temperature, and the heated circulating hot water enters the high-temperature circulating hot water tank 1014; the latent heat flash evaporation zone heat exchange tube 1012 and the steam flash evaporation tank 1015 form a latent heat flash evaporation zone, the sensible heat warming zone and the latent heat flash evaporation zone are connected through a high-temperature circulating hot water tank 1014, the high-temperature circulating hot water is heated by the solution dispersed in the absorber 101 in the latent heat flash evaporation zone heat exchange tube 1012 to be warmed again, and part of the circulating hot water is subjected to primary flash evaporation in the latent heat flash evaporation zone heat exchange tube 1012 and the steam flash evaporation tank 1015 in the warming process; the heat transfer areas of the sensible heat temperature rising area heat exchange tube 1011 and the latent heat flash evaporation area heat exchange tube 1012 are different, so that sensible heat temperature rising and latent heat flash evaporation are facilitated; the steam flash evaporation tank 1015 and the secondary flash evaporation tank 3 are connected through a steam-water circulation pipeline 1017, the steam-water circulation pipeline 1017 is inserted into the steam storage area 304, and the steam-water circulation pipeline 1017 inserted into the steam storage area 304 is bent downwards, so that the steam-water mixture entering the secondary flash evaporation tank 3 is prevented from splashing upwards in the secondary flash evaporation process.
Absorber 101 and second grade flash tank 3 carry out integral type structural arrangement, make circulating hot water sensible heat intensification and latent heat flash distillation combine together in absorber 101, unit heat exchange efficiency obtains promoting by a wide margin, and absorber 101 and second grade flash tank 3 all can reduce heat transfer area, have saved the processing material, have reduced the occupation of land space of unit.
The absorption heat pump 1, the heat source water three-way valve 5, the heat source water two-way valve 6, the water supplementing control valve 7, the steam control valve A8, the steam control valve B9, the cooling water adjusting valve 11, the heat pump heat source water outlet temperature sensor 27, the heat pump circulating hot water outlet temperature sensor 28, the pressure sensor A201, the differential pressure transmitter A202, the pressure sensor B301, the differential pressure transmitter B302 and the frequency conversion controller 401 are respectively connected with the intelligent control system 10.
The intelligent control system 10 is connected with the absorption heat pump 1 to realize energy-saving control; the intelligent control system 10 is respectively connected with a pressure sensor A201 and a differential pressure transmitter A202 of the primary flash tank 2 to realize pressure control and differential pressure feedback liquid level control; the intelligent control system 10 is respectively connected with a pressure sensor B301 and a differential pressure transmitter B302 of the secondary flash tank 3 to realize pressure control and differential pressure feedback liquid level control; the intelligent control system 10 and the heat source water circulating pump 4 are connected with a variable frequency controller 401 to realize variable frequency feedback control; the intelligent control system 10 is connected with the heat source water three-way valve 5 to realize heat source water bypass control; the intelligent control system 10 is connected with the heat source water two-way valve 6 to realize heat source water regulation control; the intelligent control system 10 is connected with the water supplementing control valve 7 to realize water supplementing regulation control; the intelligent control system 10 is respectively connected with the steam control valve A8 and the steam control valve B9 to realize the regulation control of the steam control valve; the intelligent control system 10 is connected with the cooling water regulating valve 11 to realize the regulation and control of the cooling water; the intelligent control system 10 is respectively connected with the heat pump heat source water outlet temperature sensor 27 and the heat pump circulating hot water outlet temperature sensor 28 to realize heat source water outlet temperature control and heat source water input control.
The intelligent control system 10 is specifically a PLC system.
The intelligent control system 10 performs regulation control of the heat source water circulating pump 4, the heat source water two-way valve 6 and the steam control valve A8 according to the pressure and the liquid level fed back by the pressure sensor A201 and the differential pressure transmitter A202 of the primary flash tank 2, and realizes stable regulation of the liquid level of the primary flash tank 2, alarm protection of low liquid level, bypass protection of high liquid level, turn-off protection of the liquid level ultrahigh steam control valve A8 and smooth start and stable regulation of the steam control valve A8; the regulation control of the steam control valve B9 and the water supply control valve 7 is carried out according to the pressure and the liquid level fed back by the pressure sensor B301 and the differential pressure transmitter B302 of the secondary flash tank 3, so that the stable regulation of the liquid level of the secondary flash tank 3, the liquid level low alarm protection, the liquid level high steam control valve B9 turn-off protection, the smooth starting and the stable regulation of the steam control valve B9 and the water supply control valve 7 are realized; the heat source water three-way valve 5 carries out PID dual regulation control according to heat pump heat source water outlet temperature and heat pump circulation hot water outlet temperature, prevent that heat pump heat source water outlet temperature from crossing low and influencing production, low temperature protection has been realized, prevent that heat source water from causing the high unusual or the high unusual emergence of reporting to the police and shutting down of pressure of unit temperature because of crossing the input, high temperature protection has been realized, adopt intelligent control system 10 to adjust and multiple protection setting, the steady operation of unit has been ensured, the intelligent control of unit has been realized.
The method for intelligently controlling the primary flash tank 2 by using the heat pump and intelligent control system 10 comprises the following steps:
the pressure control controls the pressure of the primary flash tank 2 in a feedback mode according to the pressure sensor A201, the steam control valve adjusts, controls and sets the start-stop pressure and PID (proportion integration differentiation) adjusting pressure parameters of the steam control valve A8, and the start-stop and PID adjusting control of the steam control valve A8 is carried out according to the pressure setting parameters of the steam control valve adjusting and controlling and the actual pressure of the primary flash tank 2 fed back by the pressure control, so that the automatic adjustment of the steam control A8 and the stability of output steam pressure are realized. The liquid level of the primary flash tank 2 is subjected to feedback control by differential pressure feedback liquid level control according to the relation among a differential pressure value, a current signal and liquid level feedback measured by a differential pressure transmitter A202, the liquid level of the primary flash tank 2 is set by the differential pressure feedback liquid level control, a liquid level low alarm liquid level, a liquid level high protection first liquid level, a liquid level high protection second liquid level and PID (proportion integration differentiation) regulation liquid level parameters, when the liquid level of the primary flash tank 2 reaches the liquid level low alarm liquid level, the intelligent control system 10 sends a liquid level low alarm of the primary flash tank 2, the machine set stops for self-checking, and the liquid level low protection of the primary flash tank 2 is realized; when the liquid level of the first-stage flash tank 2 reaches a first liquid level with high liquid level protection, the heat source water two-way valve 6 is started and regulated through heat source water regulation control, and heat source water directly enters the heat source water pipeline A13 through the heat source water pipeline B14 and the heat source water two-way valve 6, so that the high liquid level protection of the first-stage flash tank 2 is realized; when the liquid level of the primary flash tank 2 reaches a second liquid level with high liquid level protection, the steam control valve A8 is turned off through the regulation and control of the steam control valve, so that accidents caused by the fact that heat source water enters a steam system through a steam pipeline A24 are prevented, after the steam control valve A8 is turned off, the pressure of the primary flash tank 2 rises to reach safe tripping pressure, the safe drainage device A203 is started to discharge the heat source water, and the safety of the steam system is guaranteed; when the liquid level of one-level flash tank 2 is between the low warning liquid level of liquid level and the high protection first liquid level of liquid level, heat source water circulating pump 4 carries out frequency conversion regulation through frequency conversion feedback control and PID regulation liquid level parameter, has guaranteed the stability of liquid level in one-level flash tank 2.
The method for intelligently controlling the secondary flash tank 3 by applying the heat pump and intelligent control system 10 comprises the following steps:
the pressure control controls the pressure of the secondary flash tank 3 in a feedback mode according to the pressure sensor B301, the steam control valve adjusts, controls and sets the start-stop pressure and PID adjusting pressure parameters of the steam control valve B9, and the start-stop and PID adjusting control of the steam control valve B9 is carried out according to the pressure setting parameters of the steam control valve adjusting and controlling and the actual pressure of the secondary flash tank 3 fed back by the pressure control, so that the automatic adjustment of the steam control valve B9 and the stability of output steam pressure are realized. The liquid level of the secondary flash tank 3 is subjected to feedback control by differential pressure feedback liquid level control according to the relation among a differential pressure value, a current signal and liquid level feedback measured by a differential pressure transmitter B302, the liquid level of the secondary flash tank 3 is set by the differential pressure feedback liquid level control, a liquid level low alarm liquid level, a water supplementing starting liquid level, a water supplementing stopping liquid level and a liquid level high protection liquid level are set by the differential pressure feedback liquid level control, when the liquid level of the secondary flash tank 3 reaches the liquid level low alarm liquid level, the intelligent control system 10 sends out a liquid level low alarm of the secondary flash tank 3, the unit is stopped for self-detection, and the liquid level low protection of the secondary flash tank 3 is realized; when the liquid level of the secondary flash tank 3 reaches a high liquid level protection liquid level, the steam control valve B9 is turned off through the regulation control of the steam control valve, so that accidents caused by the fact that circulating hot water enters a steam system through a steam pipeline B25 are prevented, after the steam control valve B9 is turned off, the pressure of the secondary flash tank 3 rises to reach a safe jump-off pressure, the safe drainage device B303 is started to discharge the circulating hot water, and the safety of the steam system is guaranteed; when the liquid level of the secondary flash tank 3 is between the water replenishing starting liquid level and the water replenishing stopping liquid level, the water replenishing control valve 7 regulates the liquid level of the secondary flash tank 3 according to the water replenishing regulation control PID regulation liquid level parameter set value and the control program thereof to regulate and replenish the water, so that the stability of the liquid level in the secondary flash tank 3 is ensured.
The method for intelligently controlling the heat source water three-way valve 5 by applying the heat pump and intelligent control system 10 comprises the following steps:
the heat pump heat source water outlet temperature sensor 27 detects the heat pump heat source water outlet temperature through heat source water outlet temperature control, and the heat source water three-way valve 5 performs PID bypass adjustment through heat source water bypass control and heat pump heat source water outlet temperature, so that the influence of the low heat pump heat source water outlet temperature on production is prevented, and low-temperature protection is realized; the heat pump circulation hot water outlet temperature sensor 28 detects the heat pump circulation hot water outlet temperature through heat source water over-input control, the heat source water three-way valve 5 carries out PID bypass adjustment through heat source water bypass control and heat pump circulation hot water outlet temperature, the abnormal alarm shutdown caused by high temperature or high pressure of the unit due to heat pump heat source water over-input is prevented, and high-temperature protection is realized.
The method for intelligently controlling the cooling water regulating valve 11 by applying the heat pump and intelligent control system 10 comprises the following steps:
the heat source water heat quantity is partially taken away by cooling water in the condenser 103, the heat quantity is wasted, the cooling water adjusting valve 11 is adopted to adjust and control the cooling water, the adjusting and control of the cooling water adjusting valve 11 are carried out according to the cooling water adjusting control and actual operation parameters of the unit, the cooling water flow entering the unit is optimally adjusted, the heat quantity of the heat source taken away by the cooling water is reduced, meanwhile, the reasonable adjustment of the solution circulation quantity and the refrigerant circulation quantity in the unit is realized through the energy-saving control of the absorption heat pump 1, the heat exchange efficiency of the unit is improved, and the energy waste is avoided.
The embodiments described above are merely preferred embodiments of the invention, rather than all possible embodiments of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (9)
1. A high-efficiency heat pump is characterized by comprising an absorption heat pump (1), a primary flash tank (2), a secondary flash tank (3), a heat source water circulating pump (4), a heat source water three-way valve (5), a heat source water two-way valve (6), a water supplementing control valve (7), a steam control valve A (8), a steam control valve B (9), an intelligent control system (10) and a cooling water regulating valve (11), wherein the absorption heat pump (1) consists of an absorber (101), an evaporator (102), a condenser (103) and a regenerator (104); a pressure sensor A (201), a differential pressure transmitter A (202) and a safety drainage device A (203) are arranged on the primary flash tank (2); a pressure sensor B (301), a differential pressure transmitter B (302) and a safety drainage device B (303) are arranged on the secondary flash tank (3); the top of the primary flash tank (2) is connected with a steam pipeline A (24), and a steam control valve A (8) is arranged on the steam pipeline A (24); the top of the secondary flash tank (3) is connected with a steam pipeline B (25), and a steam control valve B (9) is arranged on the steam pipeline B (25); the steam pipeline A (24) and the steam pipeline B (25) are connected to a steam outlet pipeline (26) in a converging manner, and a one-way valve (29) is arranged on the steam outlet pipeline (26); a heat source water inlet pipeline (12) is arranged on the side wall of the middle part of the primary flash tank (2), a heat source water pipeline A (13) is arranged at the bottom of the primary flash tank (2), a heat source water pipeline B (14) is connected between the heat source water inlet pipeline (12) and the heat source water pipeline A (13), and a heat source water two-way valve (6) is arranged on the heat source water pipeline B (14); a heat source water circulating pump (4) is arranged on a heat source water pipeline A (13), a variable frequency controller (401) is arranged on the heat source water circulating pump (4), the heat source water circulating pump (4) is connected with an evaporator (102) through a heat source water pipeline C (15), a pipeline is arranged between the evaporator (102) and a regenerator (104), a heat source water outlet of the regenerator (104) is provided with a heat pump heat source water outlet pipeline (16), a heat pump heat source water outlet temperature sensor (27) and a heat source water three-way valve (5) are arranged on the heat pump heat source water outlet pipeline (16), the heat source water three-way valve (5) is respectively connected with a heat source water bypass pipeline (17) and the heat source water outlet pipeline (18), and the heat source water bypass pipeline (17) is connected with the heat source water pipeline C (15); the condenser (103) is connected with a cooling water inlet pipeline (22) and a cooling water outlet pipeline (23), and a cooling water regulating valve (11) is arranged on the cooling water inlet pipeline (22); the absorber (101) is connected with the secondary flash tank (3) through a heat pump circulating hot water inlet pipeline (20) and a heat pump circulating hot water outlet pipeline (21), the heat pump circulating hot water inlet pipeline (20) is connected with a water supplementing pipeline (19), the water supplementing pipeline (19) is provided with a water supplementing control valve (7), and the heat pump circulating hot water outlet pipeline (21) is provided with a heat pump circulating hot water outlet temperature sensor (28).
2. The efficient heat pump according to claim 1, wherein the absorption heat pump (1), the heat source water three-way valve (5), the heat source water two-way valve (6), the water supply control valve (7), the steam control valve a (8), the steam control valve B (9), the cooling water regulating valve (11), the heat pump heat source water outlet temperature sensor (27), the heat pump circulating hot water outlet temperature sensor (28), the pressure sensor a (201), the differential pressure transmitter a (202), the pressure sensor B (301), the differential pressure transmitter B (302), and the variable frequency controller (401) are respectively connected with the intelligent control system 10.
3. A high efficiency heat pump as claimed in claim 2, characterized in that said intelligent control system (10) is embodied as a PLC system.
4. The high-efficiency heat pump as claimed in claim 1, wherein a structure integrating the secondary flash tank (3) and the absorber (101) is provided, the absorber (101) comprises a sensible heat temperature raising region heat exchange tube (1011), a latent heat flash region heat exchange tube (1012), a low-temperature circulating hot water tank (1013), a high-temperature circulating hot water tank (1014) and a steam flash tank (1015), wherein a water replenishing interface (1018) is arranged at the lower part of the low-temperature circulating hot water tank (1013), and is used for replenishing water for the low-temperature circulating hot water tank (1013) and the secondary flash tank (3); a drain valve (1019) is arranged at the bottom of the low-temperature circulating hot water tank (1013) and is used for draining water during unit maintenance; the secondary flash tank (3) comprises a steam storage area (304), a circulating hot water storage area (305) and a sewage impurity storage area (306), wherein a low-resistance corrugated plate (307) is arranged in the steam storage area (304), the low-resistance corrugated plate (307) is used for blocking water and ventilating steam, circulating hot water is prevented from entering a steam system, the humidity of output steam is reduced, meanwhile, the low resistance does not influence the flow of the steam, and a pressure sensor B (301), a safety drainage device B (303) and a steam outlet (308) are arranged at the upper part of the steam storage area (304); a sewage discharge valve (309) is arranged at the bottom of the sewage impurity storage area (306) and is used for discharging impurities in the circulating hot water during maintenance; the steam storage area (304) is connected with a pipeline A (310), the circulating hot water storage area (305) is connected with a pipeline B (311), a differential pressure transmitter B (302) is connected between the pipeline A (310) and the pipeline B (311), a stop valve A (312) and a stop valve B (313) are respectively arranged on the pipeline A (310) and the pipeline B (311), and the stop valve A (312) and the stop valve B (313) can be shut off when the differential pressure transmitter B (302) needs to be overhauled or replaced.
5. A high efficiency heat pump as claimed in claim 1, characterized in that said secondary flash tank (3) is arranged at the upper part of the low temperature circulating hot water tank (1013) and connected by a low temperature circulating hot water pipe (1016), the low temperature circulating hot water pipe (1016) is inserted into the circulating hot water storage area (305) above the sewage impurity storage area (306); the low-temperature circulating hot water tank (1013) and the sensible heat rising temperature zone heat exchange tube (1011) form a sensible heat rising temperature zone, the low-temperature circulating hot water is heated by the solution dispersed in the absorber (101) in the sensible heat rising temperature zone heat exchange tube (1011) to rise the temperature, and the heated circulating hot water enters the high-temperature circulating hot water tank (1014); the latent heat flash evaporation zone is formed by a latent heat flash evaporation zone heat exchange tube (1012) and a steam flash evaporation tank (1015), a sensible heat heating zone is connected with the latent heat flash evaporation zone through a high-temperature circulating hot water tank (1014), the high-temperature circulating hot water is heated by solution dispersed in an absorber (101) in the latent heat flash evaporation zone heat exchange tube (1012) to be heated again, and part of circulating hot water is subjected to primary flash evaporation in the latent heat flash evaporation zone heat exchange tube (1012) and the steam flash evaporation tank (1015) in the heating process; the heat exchange tubes (1011) of the sensible heat temperature rise region and the heat exchange tubes (1012) of the latent heat flash evaporation region are different in heat transfer area; the steam flash tank (1015) is connected with the secondary flash tank (3) through a steam-water circulation pipeline (1017), the steam-water circulation pipeline (1017) is inserted into the steam storage area (304), and the steam-water circulation pipeline (1017) inserted into the steam storage area (304) is bent downwards.
6. The method for intelligently controlling the high-efficiency heat pump according to any one of the claims 1 to 5, characterized in that the method for intelligently controlling the primary flash tank (2) by using the high-efficiency heat pump is as follows:
the pressure control controls the pressure of the primary flash tank 2 in a feedback mode according to the pressure sensor A (201), the steam control valve regulates and sets the start-stop pressure and PID (proportion integration differentiation) regulation pressure parameters of the steam control valve A (8), the start-stop and PID regulation control of the steam control valve A (8) is carried out according to the pressure setting parameters regulated and controlled by the steam control valve and the actual pressure of the primary flash tank (2) fed back by the pressure control, and the automatic regulation of the steam control valve A (8) and the stability of output steam pressure are achieved; the liquid level of the primary flash tank (2) is subjected to feedback control by differential pressure feedback liquid level control according to the relation among a differential pressure value, a current signal and liquid level feedback measured by a differential pressure transmitter A (202), the liquid level of the primary flash tank (2) is set by the differential pressure feedback liquid level control, a liquid level low alarm liquid level, a liquid level high protection first liquid level, a liquid level high protection second liquid level and PID (proportion integration differentiation) regulation liquid level parameters are set by the differential pressure feedback liquid level control, when the liquid level of the primary flash tank (2) reaches the liquid level low alarm liquid level, an intelligent control system (10) sends out a liquid level low alarm of the primary flash tank (2), a unit is stopped for self-checking, and the liquid level low protection of the primary flash tank (2) is realized; when the liquid level of the first-stage flash tank (2) reaches a first liquid level with high liquid level protection, the heat source water two-way valve (6) is started and adjusted through heat source water adjustment control, and heat source water directly enters the heat source water pipeline A (13) through the heat source water pipeline B (14) and the heat source water two-way valve (6), so that the high liquid level protection of the first-stage flash tank (2) is realized; when the liquid level of the primary flash tank (2) reaches a liquid level high protection second liquid level, the steam control valve A (8) is controlled to be turned off through the steam control valve, so that heat source water is prevented from entering a steam system through a steam pipeline A (24) to cause accidents, after the steam control valve A (8) is turned off, the pressure of the primary flash tank (2) rises to reach a safe tripping pressure, the safe drainage device A (203) is started to discharge the heat source water, and the safety of the steam system is guaranteed; when the liquid level of one-level flash tank (2) is between the low warning liquid level of liquid level and the high protection first liquid level of liquid level, heat source water circulating pump (4) carry out frequency conversion regulation through frequency conversion feedback control and PID regulation liquid level parameter, have guaranteed the stability of liquid level in one-level flash tank (2).
7. The method for intelligently controlling the high-efficiency heat pump according to any one of the claims 1 to 5, characterized in that the method for intelligently controlling the secondary flash tank (3) by using the high-efficiency heat pump is as follows:
the pressure control controls the pressure of the secondary flash tank (3) in a feedback mode according to the pressure sensor B (301), the steam control valve regulates and sets the start-stop pressure and PID (proportion integration differentiation) regulation pressure parameters of the steam control valve B (9), the start-stop and PID regulation control of the steam control valve B (9) is carried out according to the pressure setting parameters of the steam control valve regulation and the actual pressure of the secondary flash tank (3) fed back by the pressure control, and the automatic regulation of the steam control valve B (9) and the stability of output steam pressure are achieved; the differential pressure feedback liquid level control carries out feedback control on the liquid level of the secondary flash tank (3) according to the relation among a differential pressure value, a current signal and liquid level feedback measured by a differential pressure transmitter B (302), the differential pressure feedback liquid level control sets a liquid level low alarm liquid level, a water supplementing starting liquid level, a water supplementing stopping liquid level and a liquid level high protection liquid level, when the liquid level of the secondary flash tank (3) reaches the liquid level low alarm liquid level, the intelligent control system (10) sends out a liquid level low alarm of the secondary flash tank (3), the unit is stopped for self-checking, and the liquid level low protection of the secondary flash tank (3) is realized; when the liquid level of the secondary flash tank (3) reaches a high liquid level protection liquid level, the steam control valve B (9) is controlled to be turned off through the steam control valve, so that the circulating hot water is prevented from entering a steam system through a steam pipeline B (25) to cause accidents, after the steam control valve B (9) is turned off, the pressure of the secondary flash tank (3) rises to reach a safe tripping pressure, and the safe drainage device B (303) is started to discharge the circulating hot water, so that the safety of the steam system is guaranteed; when the liquid level of the secondary flash tank (3) is between the water supplementing starting liquid level and the water supplementing stopping liquid level, the water supplementing control valve (7) regulates the liquid level parameter set value and the control program of the PID according to the water supplementing regulation control to regulate the liquid level of the secondary flash tank (3) and supplement water, so that the stability of the liquid level in the secondary flash tank (3) is ensured.
8. A method for intelligent control of a high efficiency heat pump according to any of claims 1-5, characterized in that the method for intelligent control of the three-way valve (5) for heat source water by the high efficiency heat pump is as follows:
the heat pump heat source water outlet temperature sensor (27) detects the heat pump heat source water outlet temperature through heat source water outlet temperature control, and the heat source water three-way valve (5) performs PID bypass adjustment through heat source water bypass control and heat pump heat source water outlet temperature, so that the influence of the over-low heat pump heat source water outlet temperature on production is prevented, and low-temperature protection is realized; a heat pump circulating hot water outlet temperature sensor (28) detects the temperature of a heat pump circulating hot water outlet through heat source water over-input control, and a heat source water three-way valve (5) performs PID bypass adjustment through heat source water bypass control and the temperature of the heat pump circulating hot water outlet, so that the occurrence of alarm shutdown caused by high unit temperature or high pressure abnormity due to heat pump heat source water over-input is prevented, and high-temperature protection is realized.
9. A method for intelligent control of a high efficiency heat pump according to any of claims 1-5, characterized in that the method for intelligent control of cooling water regulating valve (11) by means of a high efficiency heat pump is as follows: one part of the heat source water is taken away by cooling water in a condenser (103), the part of the heat is wasted, a cooling water adjusting valve (11) is adopted to adjust and control the cooling water, the adjusting and control of the cooling water adjusting valve (11) are carried out according to the cooling water adjusting and control and the actual operation parameters of the unit, the optimal adjustment is carried out on the flow of the cooling water entering the unit, the heat taken away by the cooling water of the heat source is reduced, and meanwhile, the reasonable adjustment of the solution circulation quantity and the refrigerant circulation quantity in the unit is realized through the energy-saving control of an absorption heat pump (1).
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| KR101851231B1 (en) * | 2017-04-19 | 2018-04-23 | (주)월드이엔씨 | Absorption type heat pump system for gaining high temperature |
| KR102020771B1 (en) * | 2018-05-28 | 2019-11-04 | (주)월드이엔씨 | Absorption type heat pump system providing hot water and cold water |
| CN215294852U (en) * | 2021-04-26 | 2021-12-24 | 松下制冷（大连）有限公司 | High-efficiency heat pump |
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Address after: 116600 No.117, 118 Huaihe West Road, Dalian Economic and Technological Development Zone, Liaoning Province (No.10 Songlan Street) Applicant after: Bingshan Songyang Refrigeration (Dalian) Co.,Ltd. Address before: 116600 No.117, 118 Huaihe West Road, Dalian Economic and Technological Development Zone, Liaoning Province (No.10 Songlan Street) Applicant before: PANASONIC REFRIGERATION (DALIAN) CO.,LTD. |
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