CN114084922B - Heat pump water treatment system and working method thereof - Google Patents
Heat pump water treatment system and working method thereof Download PDFInfo
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- CN114084922B CN114084922B CN202111382081.2A CN202111382081A CN114084922B CN 114084922 B CN114084922 B CN 114084922B CN 202111382081 A CN202111382081 A CN 202111382081A CN 114084922 B CN114084922 B CN 114084922B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000003507 refrigerant Substances 0.000 claims abstract description 58
- 238000001704 evaporation Methods 0.000 claims abstract description 43
- 230000008020 evaporation Effects 0.000 claims abstract description 40
- 238000007906 compression Methods 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 17
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 106
- 239000007788 liquid Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 14
- 239000007864 aqueous solution Substances 0.000 claims 2
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 5
- 238000004821 distillation Methods 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 11
- 239000002918 waste heat Substances 0.000 description 9
- 238000011084 recovery Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
-
- 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
- F25B30/02—Heat pumps of the compression type
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a heat pump water treatment system and a working method thereof. The method comprises the following steps: the heat energy of heat release and condensation in the one-effect evaporator is utilized to drive the multi-effect distillation system by utilizing high-temperature and high-pressure refrigerant steam of the compression heat pump cycle, and the condensation heat of secondary steam and the heat of the one-effect condensate water generated at the tail end of the multi-effect evaporation cycle are respectively recovered through the two evaporators of the compression heat pump. The invention utilizes the compression heat pump with stable performance to recycle the condensation heat of the tail end steam of the multi-effect evaporation system and the heat of the first-effect condensed water, thereby realizing the evaporation treatment of sewage or wastewater without an additional heat source, greatly reducing the energy consumption of multi-effect evaporation circulation and effectively reducing the energy waste and environmental influence caused by the discharge of wastewater into the environment.
Description
Technical Field
The invention belongs to the technical field of industrial water treatment and heat recovery, relates to a heat pump water treatment system, and particularly relates to a water treatment system coupled with a compression heat pump by utilizing multi-effect evaporation and a working method thereof.
Background
In the industrial field, especially industries such as chemical industry, petroleum, pharmacy and the like, most of the industrial wastewater is treated by utilizing an evaporation technology, but the evaporation technology is a unit operation with higher energy consumption, so that the energy consumption in wastewater treatment is always great, waste of waste heat of an evaporation system is still serious in the traditional industry, the secondary steam is not recycled by using the traditional concentration method of single-effect distillation, about 30% of waste heat and waste heat are recycled, the secondary steam is discharged, latent heat of steam is wasted, and part of materials flow out of the evaporation system along with the secondary steam, so that certain pollution is caused to the environment. Therefore, the recycling of waste heat and the recovery of waste heat are one of important links of energy conservation and emission reduction, and are necessary measures for reducing cost, protecting environment and enhancing efficiency of enterprises.
At present, the most commonly used recovery method of low-temperature secondary steam waste heat is mechanical steam recompression, but when the temperature of waste water is too low, the pressure and temperature of secondary steam are lower, the specific heat capacity of steam is larger, the flow rate and the pressure ratio of a compressor are larger, the technology of a current large-flow large-pressure-ratio steam compressor is still immature, the failure rate of the compressor is high, and the stability of a system is poor, so that a method for realizing the heat recovery and concentration treatment of waste water by recovering the secondary steam heat of a multi-effect evaporation system is needed to replace the mechanical compression steam compressor, and the dependence of the multi-effect evaporation system on heat source steam is preferably eliminated.
The compression heat pump adopting the refrigerant is a heat recovery energy-saving technology for heat supply, along with the development of high-temperature refrigerant, the condensing temperature above 100 ℃ is realized so as to be free from the limitation of the compression heat pump technology, and how to combine the high-temperature heat pump technology with the multi-effect evaporation water treatment technology provides a technology capable of guaranteeing the efficiency and the stability of the high-temperature heat pump and reducing the energy consumption of the multi-effect evaporation water treatment, so that the dependency on boiler steam is completely overcome, and the technology is an urgent requirement for the development of future technologies.
Disclosure of Invention
The invention provides a heat pump water treatment system and a working method thereof, aiming at the problems in the prior art.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a heat pump water treatment system comprising a multi-effect evaporation cycle system and a compression heat pump cycle system, wherein the multi-effect evaporation cycle comprises: the system comprises a centrifugal pump 1, a first preheater 2, a second preheater 3, a three-way regulating valve 4, a third preheater 5, a first-effect evaporator 6, a second-effect evaporator 7 and a pressure reducing valve 8; the water to be treated is connected to the centrifugal pump 1 through a pipeline, the outlet of the centrifugal pump 1 is connected to the inlet a1 of the first preheater 2 through a pipeline via a first stop valve 21, the outlet a2 of the first preheater 2 is connected to the inlet b1 of the second preheater 3 through a pipeline, and the outlet b2 of the second preheater 3 is connected to the inlet c1 of the three-way regulating valve 4 through a pipeline; the outlet c2 of the three-way regulating valve 4 is connected to the inlet d1 of the third preheater 5 through a pipeline, the outlet c3 of the three-way regulating valve 4 and the solution outlet d2 of the third preheater 5 are connected to the solution inlet e1 of the first-effect evaporator 6 through a pipeline, the solution outlet e2 of the first-effect evaporator 6 is connected to the solution inlet f1 of the second-effect evaporator 7 through a pipeline through a pressure reducing valve 8, and the solution outlet f2 of the second-effect evaporator 7 is connected to the inlet b3 of the second preheater 3 through a pipeline through a second stop valve 22 and is discharged from the outlet b 4;
the top steam outlet of the first-effect evaporator 6 is connected to a fourth stop valve 24 through a pipeline and connected to the steam inlet f3 of the second-effect evaporator 7 through a first regulating valve 17; the top secondary steam outlet of the two-effect evaporator 7 is respectively connected to a fifth stop valve 25 and a steam inlet g1 of the first evaporator 10 through a second regulating valve 18 through pipelines, and the fourth stop valve 24 and the fifth stop valve 25 are connected to the vacuum pump 9 through pipelines; the condensed water outlet g2 of the first evaporator 10 is connected to the condensed water inlet a3 of the first preheater 2 through a sixth stop valve 26 by a pipeline and is discharged from the condensed water outlet a 4; the condensate outlet f4 of the two-effect evaporator 7 is connected to the condensate inlet h1 of the second evaporator 13 through a pipeline by a third stop valve 23 and is discharged from the condensate outlet h 2;
the compression heat pump cycle system includes: a first evaporator 10, a first compressor 11, a second compressor 12, a second evaporator 13, a first throttle valve 14, an evaporation pressure regulating valve 15, a second throttle valve 16; the outlet of the first compressor 11 is connected to the inlet of the second compressor 12 through a pipeline and is connected to the refrigerant inlet d3 of the third preheater 5 through a seventh stop valve 27 and a third regulating valve 19 in sequence, and the refrigerant outlet d4 of the third preheater 5 is connected to the refrigerant inlet h3 of the second evaporator 13 through a pipeline and a second throttling valve 16; the outlet of the second compressor 12 is connected to the refrigerant inlet e3 of the first effect evaporator 6 through a pipeline, the refrigerant outlet e4 of the first effect evaporator 6 is connected to the refrigerant inlet g3 of the first evaporator 10 through a pipeline through a first throttle valve 14, and the refrigerant outlet g4 of the first evaporator 10 and the refrigerant outlet h4 of the third preheater 5 are connected to the inlet of the first compressor 11 through a pipeline together through a one-way valve 20 and an evaporation pressure valve 15;
further, the first pressure controller 28 is installed on the first-effect evaporator 6, and a control signal of the first pressure controller 28 is connected with the first regulating valve 17 through a wire; the second pressure controller 29 is arranged on the two-effect evaporator 7, and a control signal of the second pressure controller 29 is connected with the second regulating valve 18 through a wire.
Further, a first temperature controller 30 is arranged on an outlet h2 pipeline of the second evaporator 13, and a control signal of the first temperature controller 30 is connected with a third regulating valve 19 through a wire; the outlet d4 pipeline of the third preheater 5 is provided with a second temperature controller 31, and a control signal of the second temperature controller 31 is connected with the three-way regulating valve 4 through a wire.
Further, the first compressor 11 and the second compressor 12 are two independent compressors or a single compressor with intermediate air extraction, when the two independent compressors are two independent compressors, an intercooler is additionally arranged, and when the two independent compressors are the single compressor with intermediate air extraction, part of refrigerant gas in the compression process flows out through a seventh stop valve 27 to participate in circulation.
Before the system is started, a fourth stop valve 24 and a fifth stop valve 25 are opened, the rest stop valves are closed, a vacuum pump 9 is opened, the multi-effect evaporation system is vacuumized, and after the vacuumization is completed, the vacuum pump 9, the fourth stop valve 24 and the fifth stop valve 25 are closed;
when the system is started, the first stop valve 21 and the second stop valve 22 are opened, the centrifugal pump 1 is started, the water solution to be treated enters the centrifugal pump 1 for pressurization, then sequentially passes through the first preheater 2 and the second preheater 3 for preheating, then enters the three-way regulating valve 4 through the solution inlet c1, then flows into the third preheater 5 through the solution outlet c2 of the three-way regulating valve 4, then enters the first-effect evaporator 6, then enters the second-effect evaporator 7 after being depressurized through the depressurization valve 8, after the liquid levels in the first-effect evaporator 6 and the second-effect evaporator 7 reach the set height, the sixth stop valve 26 is opened, the first compressor 11 and the second compressor 12 are started for heat pump circulation, the refrigerant at the outlet of the second compressor 12 enters the first-effect evaporator 6 for exothermic condensation, then enters the first evaporator 10 through the first throttle valve 14, and then enters the first compressor 11 for compression after the heat absorption and evaporation in the first evaporator 10, and after the pressure and the temperature in the first-effect evaporator 6 and the second-effect evaporator 7 reach the set values, the normal operation stage of the system;
in the normal operation stage of the system, the third stop valve 23 and the seventh stop valve 27 are opened, at this time, part of refrigerant gas with intermediate pressure at the outlet of the first compressor 11 enters the third preheater 5 through the third regulating valve 19, the solution to be treated flowing in through the three-way regulating valve 4 is heated, the flow of the solution to be treated entering the third preheater 5 is regulated according to the temperature of the refrigerant at the outlet, the rest of solution to be treated is bypassed through the outlet c3, the solution to be treated and the solution after absorbing heat are mixed together and then enter the first-effect evaporator 6 to absorb the heat released by the refrigerant gas discharged by the second compressor 12, the water vapor generated by evaporation enters the second-effect evaporator 7 to release heat and condense after the flow is regulated by the first regulating valve 17, and the condensed water enters the second evaporator 13 to release heat and cool through the third stop valve 23 and then enters the subsequent drainage system; the refrigerant liquid obtained by condensing the refrigerant gas in the third preheater 5 enters the second evaporator 13 to absorb heat and evaporate after being throttled by the second throttle valve 16, and then enters the first compressor 11 to be compressed together with the refrigerant at the outlet g4 of the first evaporator 10 after being depressurized by the evaporating pressure regulating valve 15; the solution which is depressurized by the pressure reducing valve 8 from the first-effect evaporator 6 and enters the second-effect evaporator 7 absorbs the latent heat of the liquefaction of the steam flowing in the first-effect evaporator 6 in the second-effect evaporator 7 to evaporate to generate secondary steam, the generated secondary steam enters the first evaporator 10 to release heat and condense after the flow is regulated by the second regulating valve 18, the generated condensed water enters the first preheater 2, and the condensed water after releasing heat enters a subsequent drainage system.
Further, the first regulating valve 17 is controlled by the pressure of the first pressure controller 28, and the opening degree of the first regulating valve 17 is in direct proportion to the pressure in the first-effect evaporator 6; the second regulating valve 18 is pressure-controlled by a second pressure controller 29, the opening of the second regulating valve 18 being in a proportional regulating relationship with the pressure in the second-effect evaporator 7.
Further, the third regulating valve 19 is controlled by the temperature of the first temperature controller 30, and the opening of the third regulating valve 19 is regulated in proportion to the temperature at the outlet h2 of the second evaporator 13; the three-way regulating valve 4 is controlled by the temperature of the second temperature controller 31, and the opening of the c2 outlet of the three-way regulating valve 4 is in proportional regulating relation with the temperature at the outlet d4 of the third preheater 5.
Compared with the prior art, the technical scheme of the invention has the following advantages and beneficial effects:
the heat energy of heat release and condensation of high-temperature high-pressure refrigerant steam of the compression heat pump cycle is utilized to drive the multi-effect distillation system, the compression heat pump of the refrigerant is utilized to recycle the condensation heat of secondary steam and the heat of first-effect condensed water generated at the tail end of the multi-effect evaporation cycle, the newly developed high-temperature refrigerant can output a heat source above 100 ℃, the heat source can be provided for the multi-effect evaporation system without an additional heat source, the evaporation treatment of sewage or wastewater is realized, and meanwhile, the performance of the heat pump cycle of the compressor is stable. The high-temperature heat pump technology is combined with the multi-effect evaporation water treatment technology, the respective advantages of the high-temperature heat pump technology and the multi-effect evaporation water treatment technology are utilized, the efficiency and the stability of the high-temperature heat pump can be guaranteed, the energy consumption of the multi-effect evaporation water treatment can be greatly reduced, the energy efficiency of the system is improved, and the dependence on boiler steam can be completely overcome.
Drawings
FIG. 1 is a schematic diagram of a system configuration of the present invention
In the figure: a centrifugal pump 1, a first preheater 2, a second preheater 3, a three-way regulating valve 4, a third preheater 5, a one-effect evaporator 6, a two-effect evaporator 7, a pressure reducing valve 8, a vacuum pump 9, a first evaporator 10, a first compressor 11, a second compressor 12, a second evaporator 13, a first throttle valve 14, an evaporation pressure regulating valve 15, a second throttle valve 16, a first regulating valve 17, a second regulating valve 18, a third regulating valve 19, a one-way valve 20, a first stop valve 21, a second stop valve 22, a third stop valve 23, a fourth stop valve 24, a fifth stop valve 25, a sixth stop valve 26, a seventh stop valve 27, a first pressure controller 28, a second pressure controller 29, a first temperature controller 30, and a second temperature controller 31.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, so that the above objects, features and advantages of the present invention can be more clearly understood.
As shown in fig. 1, a heat pump water treatment system includes a multi-effect evaporation circulation system and a compression heat pump circulation system, the multi-effect evaporation circulation system including: the system comprises a centrifugal pump 1, a first preheater 2, a second preheater 3, a three-way regulating valve 4, a third preheater 5, a first-effect evaporator 6, a second-effect evaporator 7 and a pressure reducing valve 8; the water to be treated is connected to the centrifugal pump 1 through a pipeline, the outlet of the centrifugal pump 1 is connected to the inlet a1 of the first preheater 2 through a pipeline via a first stop valve 21, the outlet a2 of the first preheater 2 is connected to the inlet b1 of the second preheater 3 through a pipeline, and the outlet b2 of the second preheater 3 is connected to the inlet c1 of the three-way regulating valve 4 through a pipeline; the outlet c2 of the three-way regulating valve 4 is connected to the inlet d1 of the third preheater 5 through a pipeline, the outlet c3 of the three-way regulating valve 4 and the solution outlet d2 of the third preheater 5 are connected to the solution inlet e1 of the first-effect evaporator 6 through a pipeline, the solution outlet e2 of the first-effect evaporator 6 is connected to the solution inlet f1 of the second-effect evaporator 7 through a pipeline through a pressure reducing valve 8, and the solution outlet f2 of the second-effect evaporator 7 is connected to the inlet b3 of the second preheater 3 through a pipeline through a second stop valve 22 and is discharged from the outlet b 4;
the top steam outlet of the first-effect evaporator 6 is connected to a fourth stop valve 24 through a pipeline and connected to the steam inlet f3 of the second-effect evaporator 7 through a first regulating valve 17; the top secondary steam outlet of the two-effect evaporator 7 is respectively connected to a fifth stop valve 25 and a steam inlet g1 of the first evaporator 10 through a second regulating valve 18 through pipelines, and the fourth stop valve 24 and the fifth stop valve 25 are connected to the vacuum pump 9 through pipelines; the condensed water outlet g2 of the first evaporator 10 is connected to the condensed water inlet a3 of the first preheater 2 through a sixth stop valve 26 by a pipeline and is discharged from the condensed water outlet a 4; the condensate outlet f4 of the two-effect evaporator 7 is connected to the condensate inlet h1 of the second evaporator 13 through a pipeline by a third stop valve 23 and is discharged from the condensate outlet h 2;
the compression heat pump cycle system includes: a first evaporator 10, a first compressor 11, a second compressor 12, a second evaporator 13, a first throttle valve 14, an evaporation pressure regulating valve 15, a second throttle valve 16; the outlet of the first compressor 11 is connected to the inlet of the second compressor 12 through a pipeline and is connected to the refrigerant inlet d3 of the third preheater 5 through a seventh stop valve 27 and a third regulating valve 19 in sequence, and the refrigerant outlet d4 of the third preheater 5 is connected to the refrigerant inlet h3 of the second evaporator 13 through a pipeline and a second throttling valve 16; the outlet of the second compressor 12 is connected to the refrigerant inlet e3 of the first effect evaporator 6 through a pipeline, the refrigerant outlet e4 of the first effect evaporator 6 is connected to the refrigerant inlet g3 of the first evaporator 10 through a pipeline through a first throttle valve 14, and the refrigerant outlet g4 of the first evaporator 10 and the refrigerant outlet h4 of the third preheater 5 are connected to the inlet of the first compressor 11 through a pipeline together through a one-way valve 20 and an evaporation pressure valve 15;
the heat pump water treatment system respectively recovers condensation heat of secondary steam in the two-effect evaporator 7 through the first evaporator 10 and condensate water waste heat generated by heating the solution in the two-effect evaporator 7 through the steam of the first evaporator 6 through the second evaporator 13, the refrigerant gas compressed by the second compressor 12 replaces boiler steam in the traditional multi-effect evaporation system to heat, evaporate and concentrate treatment liquid, and partial intermediate-stage pressure and temperature refrigerant gas at the outlet of the first vapor compressor 11 are introduced into the third preheater 5 to preheat the replenishing solution in consideration of higher temperature in the first evaporator 6 and higher temperature of the corresponding steam condensate water than the secondary steam in the two-effect evaporator 7, and then throttled into the second evaporator 13 to absorb the condensate water waste heat, so that preheating of the replenishing water is realized, the heat transfer difference between the refrigerant gas in the first evaporator 6 and the treated solution is reduced, and meanwhile, the condensate water waste heat flowing out of the second evaporator 7 is recovered, and the system operation efficiency is improved.
The first pressure controller 28 is arranged on the first-effect evaporator 6, and a control signal of the first pressure controller 28 is connected with the first regulating valve 17 through a wire; the second pressure controller 29 is arranged on the two-effect evaporator 7, and a control signal of the second pressure controller 29 is connected with the second regulating valve 18 through a wire.
A first temperature controller 30 is arranged on an outlet h2 pipeline of the second evaporator 13, and a control signal of the first temperature controller 30 is connected with a third regulating valve 19 through a wire; the outlet d4 pipeline of the third preheater 5 is provided with a second temperature controller 31, and a control signal of the second temperature controller 31 is connected with the three-way regulating valve 4 through a wire.
The first compressor 11 and the second compressor 12 may be two independent compressors, and an intercooler may be added at this time, or a single compressor with intermediate suction may be used, and at this time, part of the refrigerant gas flows out through the seventh stop valve 27 to participate in circulation during the compression process.
Before the system is started, a fourth stop valve 24 and a fifth stop valve 25 are opened, the rest stop valves are closed, a vacuum pump 9 is opened, the multi-effect evaporation system is vacuumized, and after the vacuumization is completed, the vacuum pump 9, the fourth stop valve 24 and the fifth stop valve 25 are closed;
when the system is started, a first stop valve 21 and a second stop valve 22 are opened, a centrifugal pump 1 is started, water solution to be treated enters the centrifugal pump 1 for pressurization, then the water solution enters a three-way regulating valve 4 through a solution inlet c1 after being preheated by a first preheater 2 and a second preheater 3, then flows into a third preheater 5 through a solution outlet c2 of the three-way regulating valve 4, then enters a first-effect evaporator 6, then enters a second-effect evaporator 7 after being depressurized by a depressurization valve 8, after the liquid levels in the first-effect evaporator 6 and the second-effect evaporator 7 reach a certain height, a sixth stop valve 26 is opened, a first compressor 11 and a second compressor 12 are started for heat pump circulation, refrigerant at an outlet of the second compressor 12 enters the first-effect evaporator 6 for exothermic condensation, then enters the first evaporator 10 through a first throttle valve 14, enters the first compressor 11 for compression after the first evaporator 10 absorbs heat and evaporates, and after the pressure and the temperature in the first-effect evaporator 6 and the second-effect evaporator 7 reach a certain value, the system is in a normal operation stage;
in the normal operation stage of the system, the third stop valve 23 and the seventh stop valve 27 are opened, at this time, part of refrigerant gas with intermediate pressure at the outlet of the first compressor 11 enters the third preheater 5 through the third regulating valve 19, the solution to be treated flowing in through the three-way regulating valve 4 is heated, the flow of the solution to be treated entering the third preheater 5 is regulated according to the temperature of the refrigerant at the outlet, the rest of solution to be treated is bypassed through the outlet c3, the solution to be treated and the solution after absorbing heat are mixed together and then enter the first-effect evaporator 6 to absorb the heat released by the refrigerant gas discharged by the second compressor 12, the water vapor generated by evaporation enters the second-effect evaporator 7 to release heat and condense after the flow is regulated by the first regulating valve 17, and the condensed water enters the second evaporator 13 to release heat and cool through the third stop valve 23 and then enters the subsequent drainage system; the refrigerant liquid obtained by condensing the refrigerant gas in the third preheater 5 enters the second evaporator 13 to absorb heat and evaporate after being throttled by the second throttle valve 16, and then enters the first compressor 11 to be compressed together with the refrigerant at the outlet g4 of the first evaporator 10 after being depressurized by the evaporating pressure regulating valve 15; the solution which is depressurized by the pressure reducing valve 8 from the first-effect evaporator 6 and enters the second-effect evaporator 7 absorbs the latent heat of the liquefaction of the steam flowing in the first-effect evaporator 6 in the second-effect evaporator 7 to evaporate to generate secondary steam, the generated secondary steam enters the first evaporator 10 to release heat and condense after the flow is regulated by the second regulating valve 18, the generated condensed water enters the first preheater 2, and the condensed water after releasing heat enters a subsequent drainage system.
The first regulating valve 17 is controlled by the pressure of the first pressure controller 28, the opening of the first regulating valve 17 is in proportional relation with the pressure in the first-effect evaporator 6, and when the pressure in the first-effect evaporator 6 is high, the valve is opened, so that the discharge amount of steam is increased; the second regulating valve 18 is controlled by the pressure of the second pressure controller 29, the opening of the second regulating valve 18 is in proportional regulation relation with the pressure in the two-effect evaporator 7, and when the pressure in the two-effect evaporator 7 is high, the valve is opened, so that the discharge amount of steam is increased.
The third regulating valve 19 is controlled by the temperature of the first temperature controller 30, the opening of the third regulating valve 19 is regulated in proportion to the temperature at the outlet h2 of the second evaporator 13, when the temperature at the outlet h2 of the second evaporator 13 is too high, the refrigeration capacity of the second evaporator 13 is insufficient, and at the moment, the valve opening of the third regulating valve 19 is increased to increase the flow rate of the refrigerant; the three-way regulating valve 4 is controlled by the temperature of the second temperature controller 31, the opening of the c2 outlet of the three-way regulating valve 4 is in a proportional regulating relation with the temperature of the outlet d4 of the third preheater 5, when the temperature of the outlet d4 of the third preheater 5 is too high, the water quantity to be treated in the third preheater 5 is insufficient, the opening of the c2 outlet of the three-way regulating valve 4 is increased, and the flow of water to be treated is increased.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (7)
1. A heat pump water treatment system comprising a multi-effect evaporation circulation system and a compression heat pump circulation system, the multi-effect evaporation circulation system comprising: the device comprises a centrifugal pump (1), a first preheater (2), a second preheater (3), a three-way regulating valve (4), a third preheater (5), a first-effect evaporator (6), a second-effect evaporator (7) and a pressure reducing valve (8); the water to be treated is connected to a centrifugal pump (1) through a pipeline, the outlet of the centrifugal pump (1) is connected to the inlet (a 1) of a first preheater (2) through a pipeline via a first stop valve (21), the outlet (a 2) of the first preheater (2) is connected to the inlet (b 1) of a second preheater (3) through a pipeline, and the outlet (b 2) of the second preheater (3) is connected to the inlet (c 1) of a three-way regulating valve (4) through a pipeline; the outlet (c 2) of the three-way regulating valve (4) is connected to the inlet (d 1) of the third preheater (5) through a pipeline, the outlet (c 3) of the three-way regulating valve (4) and the solution outlet (d 2) of the third preheater (5) are connected to the solution inlet (e 1) of the one-effect evaporator (6) through a pipeline, the solution outlet (e 2) of the one-effect evaporator (6) is connected to the solution inlet (f 1) of the two-effect evaporator (7) through a pipeline through a pressure reducing valve (8), and the solution outlet (f 2) of the two-effect evaporator (7) is connected to the inlet (b 3) of the second preheater (3) through a pipeline through a second stop valve (22) and is discharged from the outlet (b 4);
the top steam outlet of the first-effect evaporator (6) is connected to a fourth stop valve (24) through a pipeline and connected to the steam inlet (f 3) of the second-effect evaporator (7) through a first regulating valve (17); the top secondary steam outlet of the two-effect evaporator (7) is respectively connected to a fifth stop valve (25) through a pipeline and connected to a steam inlet (g 1) of the first evaporator (10) through a second regulating valve (18), and the fourth stop valve (24) and the fifth stop valve (25) are connected to a vacuum pump (9) through pipelines; the condensed water outlet (g 2) of the first evaporator (10) is connected to the condensed water inlet (a 3) of the first preheater (2) through a sixth stop valve (26) by a pipeline and is discharged from the condensed water outlet (a 4); the condensate water outlet (f 4) of the two-effect evaporator (7) is connected to the condensate water inlet (h 1) of the second evaporator (13) through a pipeline by a third stop valve (23) and is discharged from the condensate water outlet (h 2);
the compression heat pump cycle system includes: a first evaporator (10), a first compressor (11), a second compressor (12), a second evaporator (13), a first throttle valve (14), an evaporation pressure regulating valve (15), and a second throttle valve (16); the outlet of the first compressor (11) is connected to the inlet of the second compressor (12) through a pipeline and is connected to the refrigerant inlet (d 3) of the third preheater (5) through a seventh stop valve (27) and a third regulating valve (19) in sequence, and the refrigerant outlet (d 4) of the third preheater (5) is connected to the refrigerant inlet (h 3) of the second evaporator (13) through a pipeline and a second throttling valve (16); the outlet of the second compressor (12) is connected to the refrigerant inlet (e 3) of the first effect evaporator (6) through a pipeline, the refrigerant outlet (e 4) of the first effect evaporator (6) is connected to the refrigerant inlet (g 3) of the first evaporator (10) through a pipeline through a first throttle valve (14), and the refrigerant outlet (g 4) of the first evaporator (10) and the refrigerant outlet (h 4) of the third preheater (5) are connected to the inlet of the first compressor (11) through a pipeline together after passing through an evaporation pressure valve (15) through a one-way valve (20).
2. A heat pump water treatment system according to claim 1, wherein the first pressure controller (28) is mounted on the first evaporator (6), and a control signal of the first pressure controller (28) is connected with the first regulating valve (17) through a wire; the second pressure controller (29) is arranged on the two-effect evaporator (7), and a control signal of the second pressure controller (29) is connected with the second regulating valve (18) through a wire.
3. A heat pump water treatment system according to claim 1, characterized in that a first temperature controller (30) is arranged on the outlet (h 2) pipeline of the second evaporator (13), and the control signal of the first temperature controller (30) is connected with a third regulating valve (19) through a wire; and a second temperature controller (31) is arranged on the outlet (d 4) pipeline of the third preheater (5), and a control signal of the second temperature controller (31) is connected with the three-way regulating valve (4) through a wire.
4. A heat pump water treatment system according to claim 1, characterized in that the first compressor (11) and the second compressor (12) are two independent compressors or a single compressor with intermediate suction, and an intercooler is added when the two independent compressors are two independent compressors, and part of refrigerant gas in the compression process flows out through a seventh stop valve (27) to participate in circulation when the single compressor with intermediate suction is used.
5. A method of operating a heat pump water treatment system according to any one of claims 1 to 4, characterized in that before the system is started, the fourth shut-off valve (24), the fifth shut-off valve (25) are opened, the remaining shut-off valves are closed, the vacuum pump (9) is opened, the multi-effect evaporation system is vacuumized, and after vacuumization is completed, the vacuum pump (9), the fourth shut-off valve (24), the fifth shut-off valve (25) are closed;
when the system is started, a first stop valve (21) and a second stop valve (22) are opened, a centrifugal pump (1) is started, aqueous solution to be treated enters the centrifugal pump (1) for pressurization, then the aqueous solution sequentially passes through a first preheater (2) and a second preheater (3) for preheating, then enters the three-way regulating valve (4) through a solution inlet (c 1) of the three-way regulating valve (4), then enters a third preheater (5) through a solution outlet (c 2) of the three-way regulating valve (4), then enters a first-effect evaporator (6), then enters a second-effect evaporator (7) after being depressurized by a depressurization valve (8), after the liquid levels in the first-effect evaporator (6) and the second-effect evaporator (7) reach a set height, a sixth stop valve (26) is opened, the first compressor (11) and the second compressor (12) are started for circulation, then the refrigerant at the outlet of the second compressor (12) enters the first-effect evaporator (6) for exothermic condensation, enters the first evaporator (10) through a first throttle valve (14), and then enters the first-effect evaporator (6) for heat absorption, and then enters the first-effect evaporator (7) for normal operation after the first-effect evaporator (6) and the second-effect evaporator (7) reach the set temperature;
in the normal operation stage of the system, a third stop valve (23) and a seventh stop valve (27) are opened, at the moment, part of refrigerant gas with intermediate pressure at the outlet of the first compressor (11) enters the third preheater (5) through the third regulating valve (19), the solution to be treated flowing in the three-way regulating valve (4) is heated, the flow rate of the solution to be treated entering the third preheater (5) is regulated according to the temperature of the outlet refrigerant, the rest of solution to be treated is bypassed through the solution outlet (c 3) of the three-way regulating valve (4), the rest of solution to be treated is mixed with the heat-absorbed solution to be treated and enters the first evaporator (6) to absorb heat released by the refrigerant gas discharged by the second compressor (12), water vapor generated by evaporation enters the second evaporator (7) to release heat and condense after the flow rate is regulated by the first regulating valve (17), and the condensed water enters the second evaporator (13) to release heat and cool down and then enter a subsequent drainage system; refrigerant liquid obtained by condensing refrigerant gas in the third preheater (5) enters the second evaporator (13) to absorb heat and evaporate after being throttled by the second throttle valve (16), and then enters the first compressor (11) to be compressed together with refrigerant at the outlet (g 4) of the first evaporator (10) after being depressurized by the evaporating pressure regulating valve (15); the solution which enters the two-effect evaporator (7) after being depressurized by the pressure reducing valve (8) from the one-effect evaporator (6) absorbs the latent heat of the vapor liquefaction flowing in the one-effect evaporator (6) in the two-effect evaporator (7) to evaporate to generate secondary vapor, the generated secondary vapor enters the first evaporator (10) to release heat and condense after the flow rate is regulated by the second regulating valve (18), the generated condensed water enters the first preheater (2), and the condensed water after releasing heat enters a subsequent drainage system.
6. A method of operating a heat pump water treatment system according to claim 5, wherein the first regulating valve (17) is controlled by the pressure of a first pressure controller (28), the opening of the first regulating valve (17) being in direct proportion to the pressure in the first evaporator (6); the second regulating valve (18) is controlled by the pressure of the second pressure controller (29), and the opening degree of the second regulating valve (18) is in proportional regulating relation with the pressure in the double-effect evaporator (7).
7. A method of operating a heat pump water treatment system according to claim 5, characterized in that the third regulating valve (19) is temperature controlled by a first temperature controller (30), the opening of the third regulating valve (19) being adjusted in direct proportion to the temperature at the outlet (h 2) of the second evaporator (13); the three-way regulating valve (4) is controlled by the temperature of the second temperature controller (31), and the opening degree of the outlet (c 2) of the three-way regulating valve (4) is in proportional regulating relation with the temperature at the outlet (d 4) of the third preheater (5).
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