WO2017020767A1

WO2017020767A1 - Multi-stage plate-type evaporation absorption cooling device and method

Info

Publication number: WO2017020767A1
Application number: PCT/CN2016/091993
Authority: WO
Inventors: 周轶松; 周鼎
Original assignee: 上海缔森能源技术有限公司
Priority date: 2015-07-31
Filing date: 2016-07-28
Publication date: 2017-02-09
Also published as: JP2018517115A; US20180172320A1; CN104964477A; JP6441511B2; CN104964477B

Abstract

A multi-stage plate-type evaporation absorption cooling device includes components such as a coolant water evaporator (21), a low pressure absorber (22), a four-way solution heat exchanger (10), a steam mixing tank (1), a first plate-type inner coupling phase-change heat exchanger (2), a second plate-type inner coupling phase-change heat exchanger (4), a third plate-type inner coupling phase-change heat exchanger (6), a first flash separating tank (3), a second flash separating tank (5), a third flash separating tank (7), a mechanical steam compression pump (11) and a condensation water liquid level meter (20). Dilute solution is continuously evaporated and concentrated by a plate-type evaporation unit formed of three plate-type inner coupling phase-change heat exchangers (2, 4, 6), and the condensation latent heat of the coolant water steam produced in the dilute solution evaporation process is fully recovered and used to generate regenerated steam, which is recompressed by the mechanical steam compression pump (11) to increase the pressure and temperature and used as a heat source.

Description

Multi-stage plate type evaporation absorption refrigeration device and method

[Technical field]

The invention relates to a waste heat recovery device and method, and in particular to a multi-stage plate type evaporation absorption refrigeration device and method.

[Background technique]

The traditional absorption refrigeration method has a history of nearly one hundred years of production, using basic stereotyped thermodynamic processes and equipment; in practical use, the most used is the lithium bromide absorption refrigeration cycle for air conditioners and ammonia for refrigeration and air conditioning. Absorption refrigeration cycle. In recent decades, due to the influence of the Montreal Protocol, the use of fluorocarbons has been reduced, and the use of waste heat as a driving heat source has been used to reduce carbon emissions. The absorption refrigeration method has been greatly promoted and developed, such as China. Patent CN200510060377.7 "Multi-energy-driven lithium bromide refrigeration air conditioner" patent, using solar energy, microwave and fuel (gas) multiple energy sources, Japanese patent 2009-236440 "Gas heat pup type air conditioning device or refrigerating device" and 2009 -236441 "Heat pup type refrigerating device" has developed an absorption refrigeration method using gas engine waste heat as an air conditioner and a refrigerator heat source. This type of refrigeration method is mostly used in the utilization of low temperature waste heat. However, these improvements do not improve the energy efficiency ratio of the absorption refrigeration cycle itself. The latest GB 29540-2013 "Lithium bromide absorption chiller energy efficiency limit value and energy efficiency rating" standard determines that the COP of the double-effect lithium bromide absorption unit is 1.12 to 1.4, while the input heat source steam of the double-effect lithium bromide refrigerator is 150 °C or even Higher temperatures, while the ammonia-water absorption unit has a cold COP of only 0.3 to 0.4. Since the steam mechanical compression heat pump has the sensible heat of low-temperature waste heat steam with a small mechanical work, it can recover its latent heat as a high-temperature steam, and is utilized as a high-temperature heat source, so it is valued in the thermal energy system, in Chinese patent CN201010198705.0 "Extracting power plants by heat pump Waste heat heating condensate system"; Chinese patent CN20101063699.5 "Cogeneration coupled heat pump to achieve regional cold and heat supply system and method"; Chinese patent CN200910223748.7 "low temperature waste heat power generation system steam condensing process auto-coupling cold source heat pump circulation device "China's patent CN201010163688.7 "Centralized heating systems and methods for power plant circulating water heat pump coupling cogeneration" all involve the use of low temperature heat sources, including water and steam, to improve the energy efficiency of the entire cogeneration heat and power generation system through heat pump units. However, none of them involves the use of steam mechanical compression heat pumps for refrigeration and air conditioning cycles to improve the energy efficiency ratio of the refrigeration unit itself.

One of the basic reasons for the low energy efficiency of the absorption refrigeration method is that the refrigerant vapor generated by the absorption of the high pressure generator coolant water needs to absorb a large amount of heat energy, and the heat contained in the refrigerant vapor is released during the condensation process. The phase change heat is discharged outside the system and cannot be recycled; and the refrigerant absorbs the low temperature heat energy of the refrigerant circulating water in the low pressure evaporator to generate low temperature low pressure refrigerant vapor, and the refrigerant vapor enters the absorber and has a vapor phase. In the liquid phase, the heat released by the phase change is usually discharged outside the refrigeration system and is not recycled. In the CN201020188184.6 "double-effect second-type lithium bromide absorption heat pump unit", only one heat pump unit for heating is developed, which does not solve the reuse of the heat of discharge in the above cycle. In CN200820115165.3 "a single-effect type third absorption heat pump that is used simultaneously in both hot and cold directions", because part of the exhaust heat is used for heating, it can supply both cooling and heating, and the COP can reach 2.2~. 2.6. However, because it is not reused in the system and reduces the energy input of the driving refrigeration system, the problem of reuse of the exhaust heat cannot be fundamentally solved. There is also no solution to the problem of low energy efficiency, so the energy efficiency ratio of refrigeration and heating is still very low.

The important reason for the high cost of absorption refrigeration and air conditioning cycle is that traditionally, shell-and-tube heat exchange equipment and spray mass transfer methods are used, heat transfer, mass transfer coefficient is low, heat exchange area is large, and circulating pump is required. Leaching absorption solution and refrigerant, and plate heat exchange in Chinese patent CN200480010361.9 "Absorber and heat exchanger with external circuit and heat pump system and air conditioning system including the same or heat exchanger" As an absorber or condenser to improve heat exchange efficiency, including US Patent No. 6,176,101 B1 "FLAT-PLATE ABSORBERS AND EVAPORATORS FOR ABSORPTION COOLERS", the condenser and absorber are assembled in a plate heat exchanger, the device is It is possible to recover the heat of condensation, but the patent does not propose a solution to improve the energy efficiency ratio of the absorption refrigeration method and reduce the system cost.

[Summary of the Invention]

It is an object of the present invention to improve the energy efficiency ratio of a multi-stage plate type evaporative absorption refrigerating apparatus.

In order to achieve the above object, a multi-stage plate type evaporative absorption refrigerating apparatus comprising:

Coolant water evaporator, including inlets,

Absorbers, including outlets and inlets,

It is also characterized by the following equipment:

A four-way solution heat exchanger comprising two cold side passages: first and second cold side passages, and a hot side passage, the inlet of the first cold side passage and the outlet of the absorber being connected by a pipe, and the outlet of the hot side passage The inlet of the absorber is connected by a pipe, the second cold measuring path is connected to the domestic water pipe, and the outlets of the first cold side passage are two: a first outlet of the first cold side passage and a second outlet of the first cold side passage ,

a steam mixer having a raw steam inlet, a regenerated steam inlet, and an outlet, the raw steam inlet being connected to the raw steam pipeline;

The first phase change heat exchanger has a hot side inlet connected to the steam mixer outlet through a pipe, and a cold side inlet and a first outlet of the first cold side passage of the four way solution heat exchanger are connected by a pipe.

The fourth plate heat exchanger has a hot side inlet connected to the hot side outlet of the first phase change heat exchanger through a pipe, and a cold side inlet connected to the domestic water pipe.

a first flash vapor separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the first phase change heat exchanger through a pipe,

The second phase change heat exchanger has a hot side inlet connected to the gas phase outlet of the first flash liquid separator through a pipe, and a cold side inlet through the pipe and a second outlet of the first cold test path of the four-way solution heat exchanger connection,

a second flash vapor separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the second phase change heat exchanger through a pipe; the liquid phase outlet and the first flash vapor separator The outlet is merged through the pipeline and connected to the hot side inlet connection of the four-way solution heat exchanger.

The third phase change heat exchanger has a hot side inlet connected to the gas phase outlet of the second flash steam separator through a pipe, and a cold side inlet connected to the hot side outlet of the fourth plate heat exchanger through a pipe through a pipe, the heat thereof The side outlet and the hot side outlet of the second phase change heat exchanger are combined by a pipe and connected to the inlet of the refrigerant water evaporator through a pipe.

a condensate level controller having an outlet, an inlet, and a drain, the outlet of which is in communication with a conduit connected between the fourth plate heat exchanger and the third phase change heat exchanger;

a third flash steam separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the third phase change heat exchanger through a pipe, the liquid phase outlet and the inlet of the condensate water level controller Connected by pipe;

The mechanical vapor compression pump has an inlet connected to the gas phase outlet of the third flash steam separator through a pipe, and an outlet connected to the steam inlet of the steam mixer through a pipe through a pipe.

The device also has the following optimized structure:

The mechanical vapor compression pump has a water supply tank that automatically measures saturation.

The first, second, and third phase change heat exchangers are plate heat exchangers, plate evaporators, plate condensers, or shell-and-tube heat exchangers.

The mechanical vapor compression pump is a combination of a single-stage or multi-stage fan and a compression pump, and is in the form of a Roots type, a centrifugal type, a reciprocating type or a screw type.

The invention also includes a refrigeration method for a multi-stage plate type evaporative absorption refrigeration device:

The dilute solution from the absorber enters the four-way solution heat exchanger and exchanges the concentrated liquid into the first and second phase change heaters respectively:

A part of the dilute solution from the absorber enters the first phase change heat exchanger for heat exchange, and the heat exchanged cold water enters the first flash liquid liquid separation tank and is separated into a vapor phase of the refrigerant water vapor and the liquid phase concentrate.

Another dilute solution from the absorber enters the second phase change heat exchanger to exchange heat with the refrigerant water vapor from the first flash vapor separation tank, and the dilute solution after the heat exchange enters the second flash vapor separation tank. a vapor phase of a refrigerant vapor and a liquid phase concentrate,

The other cold water and the refrigerant water from the absorption tank absorb the waste heat of the refrigerant water concentrate from the first and second flash steam separation tanks through the four-way solution heat exchanger to generate hot water.

The above process also has the following optimization scheme:

The vapor mixed gas exchanged in the first phase change heat exchanger enters the third phase change heat device to absorb the phase change heat of the refrigerant water vapor from the second flash steam separation tank, and then enters the third flash vapor separation Tank, gas phase The steam mixture enters the mechanical vapor compression pump to generate regeneration steam, which is mixed with the raw steam in the steam mixing tank to generate a steam mixture into the first phase change heat exchanger to exchange heat with the dilute solution.

The refrigerant water vapor condensate after heat exchange between the second and third phase change heat exchangers enters the absorber and is cooled by the refrigerant water.

The invention proposes an optimized design of lithium bromide absorption refrigeration, so that the unit can have an ultra-high energy efficiency ratio, and the COP can reach 5.5-6.

The invention recovers the heat source steam condensed water and the residual heat of the concentrated solution through the plate heat exchanger to be used for the output of domestic hot water.

In the invention, the difference between the boiling points of various refrigerants and absorbents is small, and the concept of the absorption refrigeration, air conditioning and heat pump heating cycle of the rectification type steam phase change heat recovery unit assembly is also proposed. For example, ammonia-water absorption refrigeration units.

[Description of the Drawings]

1 is a flow chart showing the structure of an apparatus of an embodiment;

1. Steam mixing tank 2. First plate internal coupling phase change heat exchanger 3. First flash separation tank 4. Second plate internal coupling phase change heat exchanger 5. Second flash separation tank 6. Three-plate internal coupling phase change heat exchanger 7. Third flash separation tank 8. Automatic water supply tank 9. Vacuum pump 10. Four-way solution heat exchanger 11. Mechanical vapor compression pump 12. Plate heat exchanger 13. Raw steam inlet 14. Import and export of domestic water 15. Import and export of domestic water 16 Import and export of refrigerant water 17 Import and export of cooling water 20. Condensate liquid level device 21 refrigerant water evaporator 22 low pressure absorber C. hydration inlet

[detailed description]

The invention is further described in the following with reference to the embodiments and the accompanying drawings, which are intended to illustrate and not to limit the scope of the invention.

1. As shown in FIG. 1, the device in this embodiment is as follows:

As shown in Figure 1:

Coolant water evaporator, including inlets,

Absorbers, including outlets and inlets,

a second phase change heat exchanger having a hot side inlet passing through the conduit and a vapor phase outlet of the first flash vapor separator Connecting, the cold side inlet is connected to the second outlet of the first cold measuring passage of the four-way solution heat exchanger through a pipe,

The above-mentioned first, second, and third phase change heat exchangers may use a plate type internal coupling phase change heat exchanger, or other conventional such as plate heat exchanger, plate evaporator, plate condenser or shell-and-tube type change. Heat exchangers of the type such as heaters.

The mechanical vapor compression pump has an inlet connected to the gas phase outlet of the third flash liquid separator through a pipeline, and an outlet thereof is connected through a pipeline to a regeneration steam inlet of the steam mixer, and the mechanical vapor compression pump has a water supply tank for automatically determining saturation. It can be a conventional steam compression book, and is a combination of a single-stage or multi-stage fan and a compression pump, and the structure can be a Roots type, a centrifugal type, a reciprocating type or a screw type.

The original heat source in this embodiment is a mixture of raw steam and regenerated steam, of course, steam or hot water; the upper part of the absorber has a refrigerant pipe, 16 is a refrigerant medium inlet and outlet; the lower part of the absorber has cooling water. Pipe, 17 in the figure is the inlet and outlet of cooling water; C is the inlet of hydration. In this unit, three sets of flash vapor separation tanks 3, 5 including a steam mechanical compressor internal heat pump 11 and three sets of plate type internal coupling phase change heat exchangers 2, 4, 6 and a heat exchanger are used. 7; The first two groups of groups mainly heat and evaporate the dilute solution of the refrigerant to complete the concentration of the dilute solution of the refrigerant and generate the refrigerant water vapor; the third group constitutes the heat recovery of the refrigerant vapor phase change and generates regeneration steam. These three groups of systems consisting of a plate-type internal coupling phase change heat exchanger and a flash vapor separation tank are in a vacuum state. The vacuum degree and the high heat exchange efficiency are required to be connected with the vacuum pump unit 9 and the vacuum pump is not pumped. Condensed gas and preset system vacuum state; each group has an absolute pressure corresponding to it. The regenerative steam (lower potential energy) generated by the third group of plate type inner coupled phase change heat exchangers 6 and flash vapor separation tanks 7 enters the mechanical vapor compression pump 11, and the mechanical vapor compression pump 11 closes the heat boost output to generate high. The saturated steam of the first-order energy is mixed into the steam mixing tank 1 and the raw steam 13 via a pipe. The heat source steam entering the first plate type internal coupling phase change heat exchanger 2 and the plate side inner coupling phase change heat exchanger are exchanged with the other side refrigerant water dilute solution, and then condensed into condensed water from the pipe into the hot side of the plate heat exchanger 12 The heat exchange with the domestic water on the other side of the inlet is performed, and the heated domestic hot water is output for the user to use, and the cooled condensed water is input to the third plate type internal coupled phase change heat exchanger 6 via the condensate circulation pump. The condensed water is vaporized into regenerated steam in the in-plate coupled phase change heat exchanger and flash vapor separation tanks 6, 8. The dilute solution of the refrigerant water flowing out from the low-pressure generator is pressed into the four-plate heat exchanger 10 through the circulation pump, and the dilute solution of the cold water enters the four-plate heat exchanger and is distributed into two paths, and one way is exchanged indirectly with the concentrated solution. After the heat is raised, the heat exchanger enters the first plate type internal coupling phase change heat exchanger 2, and the other circuit adjusts the temperature inside the device, and then the heat exchanger enters the second plate type internal coupling phase change heat device 4; the refrigerant water thin The solution enters the first plate type internal coupling phase change heat exchanger 2 to generate a vapor-liquid mixed state into the flash vapor liquid separation tank 3 and is separated into a vapor phase and a liquid phase, the liquid phase is a concentrated solution, and the vapor phase is a secondary saturated steam as a lower The first stage heat source enters the second stage plate type internal coupling phase change heat exchanger 4 and The second flash type vapor liquid separation tank 5; the second plate type internal coupling phase change heat exchanger 4 is formed by the upper side of the secondary steam (coolant water vapor) and the cold side coolant water is condensed into cold after heat exchange The agent water is discharged from the second plate inner coupling phase change heat exchanger 4 and enters the evaporator via the U tube; the other (cold) side of the second plate inner coupling phase change heat exchanger 4 is from the four-way solution heat exchanger 10 The refrigerant water exchanges with the hot side water vapor in the device to form a vapor-liquid mixed state into the second flash liquid separation tank 5, and the second flash liquid separation tank 5 separates the liquid phase into a concentrated solution from the lower portion. Returning to the four-way solution heat exchanger 10, the vapor phase is the refrigerant water vapor from the upper part, and enters the hot side of the next-stage third-stage plate type internal coupling phase change heat exchanger 6 as a heat source; the third-stage plate type internal coupling phase The hot water refrigerant of the heat exchanger 6 exchanges heat with the condensed water on the cold side, and then changes into refrigerant water from the lower part of the third-stage plate type coupling phase change heat exchanger 6, and enters the evaporator through the U-shaped tube. 21; in the third-stage plate type, the circulating condensation of the cold side of the phase change heat exchanger 6 is vaporized by the vapor-liquid separator 7 after absorbing the heat side energy, and the droplet is removed. The lower-level saturated steam (referred to as regenerated steam); the regenerated steam from the vapor-liquid separator 7 enters the mechanical vapor compression pump 11, and is heated by the mechanical vapor compression pump 11 to generate a higher-order energy regeneration. The steam, which is the main heat source entering the steam mixing tank 1, the first plate type inner phase coupled phase heat exchanger 2. The four-way solution heat exchanger 10 receives a higher temperature concentrated solution from the flash vapor separation tank 3 and the second flash vapor separation tank 5, and exchanges a part of the heat energy with the lower temperature refrigerant solution of the other side to improve The temperature of the cold water solution of the refrigerant, while the heat of the other part heats the cold domestic water of the other side. The existing four-way solution heat exchanger 10 has domestic water in and out, a dilute solution of the cold water, one in and two out, and a concentrated solution in and out, and the concentrated solution is thus cooled to a set temperature into the absorption through the four-way solution heat exchanger 10. Device 22.

The refrigerant water enters the low-pressure evaporator 21, and the absolute pressure of the low-pressure evaporator 21 is only 0.00087pa. The refrigerant water vaporizes at a temperature of about 5 ° C under the low pressure state, and needs to simultaneously absorb the same amount of energy in the refrigerant circulating water when the vaporization condition is satisfied. Therefore, the refrigerant water is thus cooled to a temperature close to the vaporization temperature. The refrigerant vapor in the absorber 22 enters the absorber 22 having the same degree of vacuum. The higher concentration lithium bromide solution in the absorber 22 has a strong ability to absorb water vapor, and the concentrated solution sufficiently absorbs the cold air vapor and is diluted into a cold agent. Water is cold The agent water circulation pump is pumped into the inlet 14. In order to meet and improve the absorption efficiency, the absorber 22 is also equipped with a refrigerant water spray circulation pump, and the absorber 22 is also provided with a refrigerant water circulation pump to ensure the evaporation effect of the coolant water. While the absorber 22 is operating, the phase in which the refrigerant water vapor is sucked is heated, so that the absorber is equipped with a tube-and-tube cooler, and the external cooling water is carried away by the cooler to remove the coolant water vapor to condense the heat to cool the solution.

The process route of the invention retains the low pressure barrel type evaporator and absorber device of the conventional evaporation type absorption refrigeration unit, and retains the relevant configuration of the original process, such as: refrigerant water pump, refrigerant water spray pump, refrigerant Water circulation pump, vacuum non-condensable gas discharge system, and related original configuration. Such a design route is advantageous for upgrading the existing absorption refrigeration unit; facilitating the understanding of the professional or similar professional technicians, and facilitating the popularization and promotion of the present invention.

Claims

A multi-stage plate type evaporative absorption refrigerating device, comprising:

Coolant water evaporator, including inlets,

Absorbers, including outlets and inlets,

It is also characterized by the following equipment:

A four-way solution heat exchanger comprising two cold side passages: first and second cold side passages, and a hot side passage, the inlet of the first cold side passage and the outlet of the absorber being connected by a pipe, and the outlet of the hot side passage The inlet of the absorber is connected by a pipe, the second cold measuring path is connected to the domestic water pipe, and the outlets of the first cold side passage are two: a first outlet of the first cold side passage and a second outlet of the first cold side passage a steam mixer having a raw steam inlet, a regenerative steam inlet, and an outlet, the raw steam inlet being connected to the raw steam pipeline;

The first phase change heat exchanger has a hot side inlet connected to the steam mixer outlet through a pipe, and a cold side inlet and a first outlet of the first cold side passage of the four way solution heat exchanger are connected by a pipe.

The fourth plate heat exchanger has a hot side inlet connected to the hot side outlet of the first phase change heat exchanger through a pipe, and a cold side inlet connected to the domestic water pipe.

a first flash vapor separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the first phase change heat exchanger through a pipe,

The second phase change heat exchanger has a hot side inlet connected to the gas phase outlet of the first flash liquid separator through a pipe, and a cold side inlet through the pipe and a second outlet of the first cold test path of the four-way solution heat exchanger connection,

a second flash vapor separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the second phase change heat exchanger through a pipe; the liquid phase outlet and the first flash vapor separator The outlet is merged through the pipeline and connected to the hot side inlet connection of the four-way solution heat exchanger.

a third phase change heat exchanger having a hot side inlet connected to a gas phase outlet of the second flash liquid separator through a pipe Connected, the cold side inlet is connected to the hot side outlet of the fourth plate heat exchanger through a pipe through a pipe, and the hot side outlet and the hot side outlet of the second phase change heat exchanger are combined by the pipe and the refrigerant water evaporator The imports are connected by pipes,

a condensate level controller having an outlet, an inlet, and a drain, the outlet of which is in communication with a conduit connected between the fourth plate heat exchanger and the third phase change heat exchanger;

a third flash steam separator having an inlet, a top gas phase outlet and a bottom liquid phase outlet, the inlet of which is connected to the cold side outlet of the third phase change heat exchanger through a pipe, the liquid phase outlet and the inlet of the condensate water level controller Connected by pipe;

The mechanical vapor compression pump has an inlet connected to the gas phase outlet of the third flash steam separator through a pipe, and an outlet connected to the steam inlet of the steam mixer through a pipe through a pipe.
A multi-stage plate type evaporative absorption refrigerating apparatus according to claim 1, wherein said mechanical vapor compression pump has a water supply tank for automatically measuring saturation.
A multi-stage plate type evaporative absorption refrigerating apparatus according to claim 1, wherein said first, second, and third phase change heat exchangers are plate heat exchangers, plate evaporators, plate condensers or tubes. Shell heat exchanger.
A multi-stage plate type evaporative absorption refrigerating apparatus according to claim 1, wherein said mechanical vapor compression pump is a combination of a single-stage or multi-stage fan and a compression pump, and the structure is a Roots type, a centrifugal type, Reciprocating or screw type.
A method of cooling a multi-stage plate type evaporative absorption refrigerating apparatus according to claim 1, wherein:

The dilute solution from the absorber enters the four-way solution heat exchanger and exchanges the concentrated liquid into the first and second phase change heaters respectively:

A part of the dilute solution from the absorber enters the first phase change heat exchanger for heat exchange, and the refrigerant water after heat exchange Entering the first flash liquid separation tank to separate the refrigerant water vapor and the liquid phase concentrate into a gas phase,

Another dilute solution from the absorber enters the second phase change heat exchanger to exchange heat with the refrigerant water vapor from the first flash vapor separation tank, and the dilute solution after the heat exchange enters the second flash vapor separation tank. a vapor phase of a refrigerant vapor and a liquid phase concentrate,

The other cold water and the refrigerant water from the absorption tank absorb the waste heat of the refrigerant water concentrate from the first and second flash steam separation tanks through the four-way solution heat exchanger to generate hot water.
A waste heat recovery method according to claim 5, wherein the vapor mixed gas exchanged in the first phase change heat exchanger enters the third phase change heatr to absorb the refrigerant from the second flash vapor separation tank. After the water vapor phase heats up, it enters the third flash steam separation tank, and the vapor mixture of the gas phase enters the mechanical vapor compression pump to generate regeneration steam, which is mixed with the raw steam in the steam mixing tank to generate the steam mixture into the first phase change. The heat exchanger exchanges heat with the dilute solution.
The waste heat recovery method according to claim 5, wherein the refrigerant water vapor condensate after heat exchange between the second and third phase change heat exchangers enters the absorber and is cooled by the refrigerant water.