CN114084922A - Heat pump water treatment system and working method thereof - Google Patents

Heat pump water treatment system and working method thereof Download PDF

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Publication number
CN114084922A
CN114084922A CN202111382081.2A CN202111382081A CN114084922A CN 114084922 A CN114084922 A CN 114084922A CN 202111382081 A CN202111382081 A CN 202111382081A CN 114084922 A CN114084922 A CN 114084922A
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outlet
evaporator
valve
preheater
regulating valve
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CN114084922B (en
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沈九兵
王炳东
谭牛高
周子晗
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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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
    • 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
    • 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)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (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 is introduced into the first-effect evaporator by utilizing the high-temperature and high-pressure refrigerant steam of the compression heat pump cycle to drive the multi-effect distillation system, and the condensation heat of the secondary steam and the heat of the first-effect condensate water generated at the tail end of the multi-effect evaporation cycle are respectively recovered by the two evaporators of the compression heat pump. The invention utilizes the compression heat pump with stable performance to recover the condensation heat of the steam at the tail end of the multi-effect evaporation system and the heat of the single-effect condensed water, thereby realizing the evaporation treatment of sewage or waste water without an additional heat source, greatly reducing the energy consumption of the multi-effect evaporation circulation, and effectively reducing the energy waste and the environmental influence caused by the discharge of the waste water into the environment.

Description

Heat pump water treatment system and working method thereof
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 chemical industry, oil, trades such as pharmacy, can utilize evaporation technology to handle industrial waste water mostly, but evaporation technology is the higher unit operation of one energy consumption, the big household of power consumption in the aspect of waste water treatment always, traditional industry is still more serious at the consumption of the energy and the waste heat of vaporization system, the concentrated method of traditional single-effect distillation, secondary steam can not be recycled, mostly only cyclic utilization and approximately 30% waste heat and waste heat have been retrieved, secondary steam discharges not only the latent heat of steam of having wasted but also partial material can be along with secondary steam is together flowing out vaporization system, can cause certain pollution to the environment. Therefore, the recycling of waste heat and the recovery of waste heat are one of the important links of energy conservation and emission reduction, and are necessary measures for cost reduction, environmental protection and efficiency improvement of enterprises.
At present, the most common method for recovering waste heat of low-temperature secondary steam is mechanical steam recompression, but when the temperature of waste water is too low, the pressure and the temperature of the secondary steam are lower, the specific heat capacity of steam is larger, the flow rate and the pressure ratio of a compressor are large, the technology of the steam compressor with large flow rate and large pressure ratio is not mature, the fault rate of the compressor is high, and the stability of the system is poor, so that a method capable of replacing the mechanical compression steam compressor is urgently needed, the method is used for recovering the heat of the secondary steam of a multi-effect evaporation system to realize the heat recovery and concentration treatment of the waste water, and the dependence of the multi-effect evaporation system on heat source steam is preferably cancelled.
A compression heat pump adopting a refrigerant is a heat supply waste heat recovery energy-saving technology, along with the development of a high-temperature refrigerant, the condensation temperature of more than 100 ℃ is realized so as not to be limited by the compression heat pump technology any more, and how to combine the high-temperature heat pump technology with a multi-effect evaporation water treatment technology is provided, so that the efficiency and the stability of the high-temperature heat pump can be ensured, the energy consumption of the multi-effect evaporation water treatment can be reduced, the dependence on boiler steam is completely overcome, and the urgent need of the future technology development is provided.
Disclosure of Invention
The present invention provides a heat pump water treatment system and a working method thereof, which aims at the problems existing in the prior art.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a heat pump water treatment system comprising a multiple-effect evaporation cycle system and a compression heat pump cycle system, wherein the multiple-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 by 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 commonly 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 and 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 and is discharged from an outlet b 4;
the top steam outlet of the first-effect evaporator 6 is connected to the fourth stop valve 24 through a pipeline and is connected to the steam inlet f3 of the second-effect evaporator 7 through the first regulating valve 17; the top secondary steam outlet of the secondary 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 commonly connected to a 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 pipeline via a sixth stop valve 26 and is discharged from the condensed water outlet a 4; a condensed water outlet f4 of the second-effect evaporator 7 is connected to a condensed water inlet h1 of the second evaporator 13 through a pipeline by a third stop valve 23 and is discharged from a condensed 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 respectively 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 second throttling valve 16 through a pipeline; the outlet of the second compressor 12 is connected to a refrigerant inlet e3 of the first-effect evaporator 6 through a pipeline, a refrigerant outlet e4 of the first-effect evaporator 6 is connected to a refrigerant inlet g3 of the first evaporator 10 through a pipeline and a first throttling valve 14, and a refrigerant outlet g4 of the first evaporator 10 is connected to the inlet of the first compressor 11 through a one-way valve 20 and a refrigerant outlet h4 of the third preheater 5 through an evaporation pressure valve 15 together through a pipeline;
further, a 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 lead; the second-effect evaporator 7 is provided with a second pressure controller 29, and a control signal of the second pressure controller 29 is connected with the second regulating valve 18 through a lead.
Further, a first temperature controller 30 is arranged on a pipeline of the outlet h2 of the second evaporator 13, and a control signal of the first temperature controller 30 is connected with the third regulating valve 19 through a lead; the outlet d4 of the third preheater 5 is provided with a second temperature controller 31 on the pipeline, and the control signal of the second temperature controller 31 is connected with the three-way regulating valve 4 through a lead.
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 provided, an intercooler is added, and when the single compressor with intermediate air extraction is provided, part of refrigerant gas flows out through the seventh stop valve 27 in the compression process to participate in the circulation.
The working method of the multi-effect evaporation coupling type water treatment system of the heat pump of the invention, the concrete method step is, before the system starts, open the fourth stop valve 24, the fifth stop valve 25, close the other stop valves, open the vacuum pump 9, carry on the vacuumization to the multi-effect evaporation system, after vacuumization is finished, close the vacuum pump 9, the fourth stop valve 24, the fifth stop valve 25;
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 aqueous 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 from the solution inlet c1, then flows into the third preheater 5 from 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 the pressure is reduced by the pressure reducing valve 8, after the liquid levels in the first-effect evaporator 6 and the second-effect evaporator 7 reach the set heights, the sixth stop valve 26 is opened, the first compressor 11 and the second compressor 12 are opened for heat pump circulation, the refrigerant at the outlet of the second compressor 12 enters the first-effect evaporator 6 for heat release and condensation, then enters the first evaporator 10 through the first throttle valve 14, and enters the first compressor 11 for compression after the heat absorption and evaporation in the first evaporator 10, after the pressure and the temperature in the first-effect evaporator 6 and the second-effect evaporator 7 reach set values, 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 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 the solution to be treated bypasses through the outlet c3, the solution to be treated and the solution to be treated after heat absorption are mixed together and then enter the first-effect evaporator 6 to absorb the heat released by the refrigerant gas discharged from the second compressor 12, the water vapor generated by evaporation enters the second-effect evaporator 7 after the flow rate is regulated through the first regulating valve 17 to release heat for condensation, and the condensed water enters the second evaporator 13 through the third stop valve 23 to release heat and reduce the temperature and then enters the subsequent drainage system; refrigerant liquid obtained by condensing refrigerant gas in the third preheater 5 enters the second evaporator 13 after being throttled by the second throttle valve 16 to be subjected to heat absorption and evaporation, and then enters the first compressor 11 together with the refrigerant at the outlet g4 of the first evaporator 10 after being subjected to pressure reduction by the evaporation pressure regulating valve 15 to be compressed; the solution entering the second-effect evaporator 7 after being depressurized by the pressure reducing valve 8 from the first-effect evaporator 6 is evaporated in the second-effect evaporator 7 by absorbing latent heat of liquefaction of steam flowing in from the first-effect evaporator 6 to generate secondary steam, the generated secondary steam enters the first evaporator 10 to release heat and condense after the flow of the generated secondary steam 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, and the opening degree of the second regulating valve 18 is regulated in direct proportion to 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 degree 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 degree of the outlet c2 of the three-way regulating valve 4 is in direct proportion regulation 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 the heat release and condensation of the 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 adopted to recover the condensation heat of the secondary steam and the heat of the 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 ℃, heat can be provided for the multi-effect evaporation system without an additional heat source, the evaporation treatment of sewage or waste water is realized, and meanwhile, the performance of the compressor heat pump cycle is stable. The high-temperature heat pump technology is combined with the multi-effect evaporation water treatment technology, and by utilizing the advantages of the high-temperature heat pump technology and the multi-effect evaporation water treatment technology, 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 a system is improved, and the dependence on boiler steam can be completely overcome.
Drawings
FIG. 1 is a schematic view of the system configuration of the present invention
In the figure: 1 is a centrifugal pump, 2 is a first preheater, 3 is a second preheater, 4 is a three-way regulating valve, 5 is a third preheater, 6 is a one-effect evaporator, 7 is a two-effect evaporator, 8 is a pressure reducing valve, 9 is a vacuum pump, 10 is a first evaporator, 11 is a first compressor, 12 is a second compressor, 13 is a second evaporator, 14 is a first throttle valve, 15 is an evaporation pressure regulating valve, 16 is a second throttle valve, 17 is a first regulating valve, 18 is a second regulating valve, 19 is a third regulating valve, 20 is a check valve, 21 is a first cut-off valve, 22 is a second cut-off valve, 23 is a third cut-off valve, 24 is a fourth cut-off valve, 25 is a fifth cut-off valve, 26 is a sixth cut-off valve, 27 is a seventh cut-off valve, 28 is a first pressure controller, 29 is a second pressure controller, 30 is a first temperature controller, and 31 is a second temperature controller.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, a heat pump water treatment system includes a multiple-effect evaporation circulation system and a compression-type heat pump circulation system, the multiple-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 by 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 commonly 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 and 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 and is discharged from an outlet b 4;
the top steam outlet of the first-effect evaporator 6 is connected to the fourth stop valve 24 through a pipeline and is connected to the steam inlet f3 of the second-effect evaporator 7 through the first regulating valve 17; the top secondary steam outlet of the secondary 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 commonly connected to a 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 pipeline via a sixth stop valve 26 and is discharged from the condensed water outlet a 4; a condensed water outlet f4 of the second-effect evaporator 7 is connected to a condensed water inlet h1 of the second evaporator 13 through a pipeline by a third stop valve 23 and is discharged from a condensed 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, a second throttle valve 16; the outlet of the first compressor 11 is respectively 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 second throttling valve 16 through a pipeline; the outlet of the second compressor 12 is connected to a refrigerant inlet e3 of the first-effect evaporator 6 through a pipeline, a refrigerant outlet e4 of the first-effect evaporator 6 is connected to a refrigerant inlet g3 of the first evaporator 10 through a pipeline and a first throttling valve 14, and a refrigerant outlet g4 of the first evaporator 10 is connected to the inlet of the first compressor 11 through a one-way valve 20 and a refrigerant outlet h4 of the third preheater 5 through an evaporation pressure valve 15 together through a pipeline;
the heat pump water treatment system recovers condensation heat of secondary steam in the second-effect evaporator 7 through the first evaporator 10 and recovers condensate waste heat generated by heating solution in the second-effect evaporator 7 through steam in the first-effect evaporator 6 through the second evaporator 13, refrigerant gas compressed by the second compressor 12 replaces boiler steam in a traditional multi-effect evaporation system to carry out heating, evaporation and concentration on treatment liquid, and considering that the temperature in the first-effect evaporator 6 is high and the corresponding steam condensate temperature is higher than the temperature of the secondary steam in the second-effect evaporator 7, partial refrigerant gas with the middle-stage pressure and temperature at the outlet of the first steam compressor 11 is introduced into the third preheater 5 to preheat replenishing solution and then throttled to enter the second evaporator 13 to absorb the condensate waste heat, so that not only is preheating of replenishing water realized, and the heat transfer temperature difference between the refrigerant gas in the first-effect evaporator 6 and the treated solution is reduced, and meanwhile, the waste heat of the condensed water flowing out of the double-effect evaporator 7 is recovered, and the operating efficiency of the system is improved.
The first-effect evaporator 6 is provided with a first pressure controller 28, and a control signal of the first pressure controller 28 is connected with the first regulating valve 17 through a lead; the second-effect evaporator 7 is provided with a second pressure controller 29, and a control signal of the second pressure controller 29 is connected with the second regulating valve 18 through a lead.
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 lead; the outlet d4 of the third preheater 5 is provided with a second temperature controller 31 on the pipeline, and the control signal of the second temperature controller 31 is connected with the three-way regulating valve 4 through a lead.
The first compressor 11 and the second compressor 12 may be two independent compressors, an intercooler may be added at this time, or a single compressor with intermediate air extraction may be used, and at this time, part of the refrigerant gas flows out through the seventh stop valve 27 in the compression process to participate in the cycle.
A working method of a heat pump multiple-effect evaporation coupling type water treatment system comprises the specific steps that 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 started, the multiple-effect evaporation system is vacuumized, and after the vacuumization is finished, 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 aqueous solution to be treated enters the centrifugal pump 1 for pressurization, then enters the three-way regulating valve 4 from the solution inlet c1 after being preheated by the first preheater 2 and the second preheater 3 in sequence, then flows into the third preheater 5 from 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 subjected to pressure reduction by the pressure reducing valve 8, after the liquid levels in the first-effect evaporator 6 and the second-effect evaporator 7 reach a certain 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 heat release and condensation, then enters the first evaporator 10 through the first throttle valve 14, and enters the first compressor 11 for compression after heat absorption and evaporation in the first evaporator 10, after the pressure and the temperature in the first-effect evaporator 6 and the second-effect evaporator 7 reach certain values, 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 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 the solution to be treated bypasses through the outlet c3, the solution to be treated and the solution to be treated after heat absorption are mixed together and then enter the first-effect evaporator 6 to absorb the heat released by the refrigerant gas discharged from the second compressor 12, the water vapor generated by evaporation enters the second-effect evaporator 7 after the flow rate is regulated through the first regulating valve 17 to release heat for condensation, and the condensed water enters the second evaporator 13 through the third stop valve 23 to release heat and reduce the temperature and then enters the subsequent drainage system; refrigerant liquid obtained by condensing refrigerant gas in the third preheater 5 enters the second evaporator 13 after being throttled by the second throttle valve 16 to be subjected to heat absorption and evaporation, and then enters the first compressor 11 together with the refrigerant at the outlet g4 of the first evaporator 10 after being subjected to pressure reduction by the evaporation pressure regulating valve 15 to be compressed; the solution entering the second-effect evaporator 7 after being depressurized by the pressure reducing valve 8 from the first-effect evaporator 6 is evaporated in the second-effect evaporator 7 by absorbing latent heat of liquefaction of steam flowing in from the first-effect evaporator 6 to generate secondary steam, the generated secondary steam enters the first evaporator 10 to release heat and condense after the flow of the generated secondary steam 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 degree of the first regulating valve 17 is in direct proportion to the pressure in the first-effect evaporator 6, and when the pressure in the first-effect evaporator 6 is high, a valve is opened to increase the discharge amount of steam; the second regulating valve 18 is controlled by the pressure of the second pressure controller 29, the opening degree of the second regulating valve 18 is in a proportional regulating relation with the pressure in the second effect evaporator 7, and when the pressure in the second effect evaporator 7 is high, the valve is opened to increase the discharge amount of the steam.
The third regulating valve 19 is controlled by the temperature of the first temperature controller 30, the opening degree 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 refrigerating capacity of the second evaporator 13 is insufficient, and at the moment, the valve opening degree of the third regulating valve 19 is increased, and the flow rate of the refrigerant is increased; the three-way regulating valve 4 is controlled by the temperature of the second temperature controller 31, the opening degree of the outlet c2 of the three-way regulating valve 4 is in a proportional regulating relation with the temperature at the outlet d4 of the third preheater 5, when the temperature at the outlet d4 of the third preheater 5 is too high, which indicates that the amount of water to be treated in the third preheater 5 is insufficient, the opening degree of the opening c2 of the three-way throttle valve 4 is increased, and the flow rate of the 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 effected by one skilled in the art without departing from the spirit and scope of the invention, and it is intended that the scope of the invention be limited only by the claims appended hereto.

Claims (7)

1. A heat pump water treatment system comprising a multiple-effect evaporation circulation system and a compression heat pump circulation system, wherein the multiple-effect evaporation circulation system 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 a centrifugal pump (1) through a pipeline, the outlet of the centrifugal pump (1) is connected to the inlet (a1) of a first preheater (2) through a pipeline by a first stop valve (21), the outlet (a2) of the first preheater (2) is connected to the inlet (b1) of a second preheater (3) through a pipeline, and the outlet (b2) of the second preheater (3) is connected to the inlet (c1) of a 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 jointly 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 and 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 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 is 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 secondary 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 jointly connected to a 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); a condensed water outlet (f4) of the second-effect evaporator (7) is connected to a condensed water inlet (h1) of the second evaporator (13) through a pipeline by a third stop valve (23) and is discharged from a condensed water outlet (h 2);
the compression heat pump cycle system includes: the system comprises 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 respectively connected to the inlet of the second compressor (12) through a pipeline and is sequentially connected to the refrigerant inlet (d3) of the third preheater (5) through a seventh stop valve (27) and a third regulating valve (19), 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 and a first throttling valve (14), and the refrigerant outlet (g4) of the first evaporator (10) is connected to the inlet of the first compressor (11) through a one-way valve (20) and the refrigerant outlet (h4) of the third preheater (5) and an evaporation pressure valve (15) in a common mode through a pipeline.
2. A heat pump water treatment system according to claim 1, wherein said first effect evaporator (6) is provided with a first pressure controller (28), and a control signal of said first pressure controller (28) is connected to the first regulating valve (17) through a wire; and a second pressure controller (29) is arranged on the second-effect evaporator (7), and a control signal of the second pressure controller (29) is connected with a second regulating valve (18) through a lead.
3. A heat pump water treatment system according to claim 1, wherein a first temperature controller (30) is provided on a line of an outlet h2 of said second evaporator (13), and a control signal of said first temperature controller (30) is connected to a third regulating valve (19) through a wire; and a pipeline of an outlet d4 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 lead.
4. A heat pump water treatment system according to claim 1, wherein said first compressor (11) and said second compressor (12) are two independent compressors or a single compressor with intermediate pumping, and when two independent compressors are provided, an intercooler is added, and when a single compressor with intermediate pumping is provided, a part of refrigerant gas during compression flows out through a seventh stop valve (27) to participate in the circulation.
5. A working method of 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 stop valve (24) and the fifth stop valve (25) are opened, the rest of the stop valves are closed, the vacuum pump (9) is started, 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, aqueous solution to be treated enters the centrifugal pump (1) for pressurization, enters the three-way regulating valve (4) through the solution inlet c1 after being preheated by the first preheater (2) and the second preheater (3) in sequence, 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 subjected to pressure reduction through the pressure reducing 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, refrigerant at the outlet of the second compressor (12) enters the first-effect evaporator (6) for heat release and condensation, then the mixed gas enters a first evaporator (10) through a first throttling valve (14), the mixed gas enters a first compressor (11) for compression after heat absorption and evaporation in the first evaporator (10), and the system is in a normal operation stage after the pressure and the temperature in a first-effect evaporator (6) and a second-effect evaporator (7) reach set values;
in the normal operation stage of the system, the third stop valve (23) and the 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) to heat the solution to be treated flowing in the three-way regulating valve (4), and the flow of the solution to be treated entering the third preheater (5) is adjusted according to the temperature of the refrigerant at the outlet, the rest solution to be treated is bypassed through an outlet c3, and is mixed with the solution to be treated after heat absorption to enter a first-effect evaporator (6) to absorb heat released by refrigerant gas discharged by a second compressor (12), water vapor generated by evaporation enters a second-effect evaporator (7) to release heat for condensation after the flow rate of the water vapor is adjusted by a first adjusting valve (17), and condensed water enters a second evaporator (13) through a third stop valve (23) to release heat and reduce the temperature and then enters a subsequent drainage system; refrigerant liquid obtained by condensing refrigerant gas in the third preheater (5) is throttled by a second throttle valve (16) and then enters a second evaporator (13) for heat absorption and evaporation, and then is decompressed by an evaporation pressure regulating valve (15) and then enters a first compressor (11) together with the refrigerant at an outlet g4 of the first evaporator (10) to be compressed; the solution entering the second-effect evaporator (7) after being decompressed by the pressure reducing valve (8) from the first-effect evaporator (6) absorbs the latent heat of 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 for condensation after the flow of the generated secondary steam is regulated by the second regulating valve (18), the generated condensate water enters the first preheater (2), and the condensate water after heat release enters a subsequent drainage system.
6. A method of operating a heat pump water processing system according to claim 5, characterized in that the first regulating valve (17) is controlled by a pressure of a first pressure controller (28), an opening degree of the first regulating valve (17) being in a direct proportional relationship with a pressure in the first effect evaporator (6); the second regulating valve (18) is controlled by the pressure of a second pressure controller (29), and the opening degree of the second regulating valve (18) is in direct proportion regulation relation with the pressure in the second-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 controlled by the temperature of the first temperature controller (30), the opening of the third regulating valve (19) being 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 degree of the outlet (c2) of the three-way regulating valve (4) is in direct proportion regulation relation with the temperature at the outlet (d4) of the third preheater (5).
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