CN111732143B

CN111732143B - Evaporation concentration system

Info

Publication number: CN111732143B
Application number: CN202010744570.7A
Authority: CN
Inventors: 路建伟; 刘威; 汪惠星
Original assignee: Kunshan Wsd Environmental Protection Equipment Co ltd
Current assignee: Kunshan Wsd Environmental Protection Equipment Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2020-12-01
Anticipated expiration: 2040-07-29
Also published as: CN111732143A

Abstract

The invention discloses an evaporation concentration system, which comprises a first evaporation tank, a second evaporation tank and a third evaporation tank, wherein the first evaporation tank is provided with a first steam outlet and a first concentrated solution outlet; the second evaporation tank is provided with a second steam outlet and a second concentrated solution outlet; a pressure reducing device; the first heat exchanger is connected with the first evaporating tank and is positioned outside the first evaporating tank; a heat source device, the heat source device comprising: the compressor unit comprises a plurality of compressors arranged in parallel, each compressor is connected with the air inlet port and the first heat exchanger, and the air inlet port is used for distributing gaseous refrigerants to each compressor to form heat exchange media provided for the first heat exchanger; the second heat exchanger is connected with the first steam outlet and the second evaporation tank and is positioned outside the second evaporation tank; the distilled water tank is connected with the second heat exchanger and the second steam outlet; the preheating device is connected with the second evaporation tank; a cooling device. The evaporation concentration system has good use effect.

Description

Evaporation concentration system

Technical Field

The invention relates to the technical field of waste liquid treatment, in particular to an evaporation concentration system.

Background

The discharge of industrial waste liquid causes serious environmental pollution, in order to protect the environment, the sewage discharge needs to be strictly controlled, each enterprise producing the industrial waste liquid needs to discharge the sewage after the sewage is treated by a special sewage treatment plant, and the sewage treatment plant generally charges according to the treatment capacity, for example, one ton and several thousand yuan, so the cost of the enterprise on the sewage treatment is also greatly increased. The heat pump technology is an efficient and environment-friendly energy-saving technology, and can be widely applied to the industrial production fields of chemical industry, low-grade heat energy utilization, seawater desalination, sewage treatment and the like. After the evaporation and concentration by the heat pump, distilled water meeting the discharge standard can be extracted from the sewage, the distilled water can be directly discharged, and the remaining concentrate is discharged to a sewage treatment plant for treatment. The sewage treatment cost of an enterprise can be greatly reduced, for example, 10 tons of sewage can be decomposed into 9 tons of distilled water and 1 ton of concentrate after evaporation concentration, and the enterprise only needs to spend the cost of 1 ton of treatment capacity, so that the sewage treatment cost is greatly reduced.

Chinese patent publication No. CN109350983A discloses a two-stage compression type heat pump dual-effect evaporation concentration system, which includes a first compressor, a heat pump condenser, a first heat pump evaporator, a second compressor, a first intermediate water circulation pipeline, a second intermediate water circulation pipeline, a first-effect evaporation tank, a second-effect evaporation tank, a starter, a condensed water collection tank, a first start-up steam generation pipeline, a first one-effect juice steam pipeline, a second-effect juice steam pipeline, a start-up secondary steam pipeline, a total condensed water pipeline, a second one-effect juice steam pipeline, and a second start-up steam generation pipeline. However, such evaporative concentration systems suffer from the following disadvantages: 1) the built-in heat exchange is adopted, so that the cleaning is difficult after scaling; 2) the medium is used for heat exchange, and the heat exchange is repeated, so that the heat loss is large, and the energy is not saved; 3) the number of arranged heat exchangers is large, and the cost is high; 4) the equipment is independently provided with a steam heat source for heating, and the energy source is inconvenient to obtain. This results in poor performance of the existing evaporative concentration systems.

Disclosure of Invention

The invention aims to solve the technical problem of poor use effect of an evaporation concentration system. The invention provides an evaporation and concentration system which is good in evaporation and concentration effect.

In order to solve the above technical problem, an embodiment of the present invention discloses an evaporation concentration system, including: the first evaporation tank is provided with a first steam outlet and a first concentrated solution outlet; the second evaporation tank is provided with a second steam outlet and a second concentrated solution outlet; the pressure reducing device is used for vacuumizing the first evaporation tank and the second evaporation tank; the first heat exchanger is connected with the first evaporation tank and is positioned outside the first evaporation tank; a heat source device, the heat source device comprising: the compressor unit comprises a plurality of compressors arranged in parallel, each compressor is connected with the air inlet and the first heat exchanger, the air inlet is used for distributing gaseous refrigerant to each compressor to form a heat exchange medium provided for the first heat exchanger, waste liquid in the first evaporation tank can flow into the first heat exchanger, is heated by the heat exchange medium, and flows back to the first evaporation tank from the first heat exchanger to be evaporated to form first water vapor; the second heat exchanger is connected with the first steam outlet and the second evaporation tank and is positioned outside the second evaporation tank, and waste liquid in the second evaporation tank can flow into the second heat exchanger, is heated by the first water vapor, flows back to the second evaporation tank from the second heat exchanger and is evaporated to form second water vapor; the distilled water tank is connected with the second heat exchanger and the second steam outlet and is used for collecting the first water vapor and the second water vapor which are liquefied;

the preheating device is connected with the second evaporation tank and is used for preheating the waste liquid in the second evaporation tank;

the cooling device is connected with the distilled water tank and used for cooling the distilled water in the distilled water tank;

the preheating device includes: an auxiliary compressor and a third heat exchanger, the third heat exchanger located within the second evaporator tank; the cooling device comprises a third refrigerating device and a fourth heat exchanger, and the fourth heat exchanger is positioned in the distilled water tank; the heat exchange medium can form a preheating medium through the auxiliary compressor, the preheating medium flows into the third heat exchanger, the preheating medium can flow into the third refrigerating device to form a cooling medium, and the cooling medium flows into the fourth heat exchanger and flows back to the auxiliary compressor through the fourth heat exchanger.

By adopting the technical scheme, the evaporation concentration system is provided with at least two evaporation tanks, and the two evaporation tanks simultaneously carry out evaporation concentration treatment on the waste liquid, so that the treatment efficiency of the waste liquid is improved; in addition, the waste liquid in the second evaporation tank is heated by the first water vapor generated by the first evaporation tank to form the second water vapor, and meanwhile, the liquefaction of the first water vapor is realized, so that the vapor energy is effectively utilized, and the energy is saved; by arranging the compressor unit and adopting the parallel superposition integration of a plurality of compressors, the output energy of the integrated compressor unit is increased, and the processing capacity of the evaporation concentration system is improved on the premise of ensuring the high energy efficiency; the heat exchanger is externally arranged, so that the heat exchanger is convenient to clean after scaling; the preheating device heats the waste liquid in the second evaporation tank, so that the evaporation concentration system is quickly started to avoid the heat source device from being in a low-load operation state; meanwhile, the cooling device cools distilled water in the distilled water tank, and normal operation of the pressure reducing device is guaranteed. Then, the whole evaporation concentration system can normally operate, the evaporation concentration effect is good, and waste liquid treatment can be effectively carried out.

According to another specific embodiment of the present invention, the heat source device further includes: the gas inlet port is used for providing the gaseous refrigerant into the gas suction pipe, and the gas outlet port is connected with each compressor so as to distribute the gaseous refrigerant in the gas suction pipe into each compressor.

According to another embodiment of the present invention, the suction pipe includes a main pipe and branch pipes corresponding to the compressors one to one, the main pipe is provided with the inlet port, the branch pipes have the outlet port and the suction port, and the suction port is located in the suction pipe.

According to another embodiment of the present invention, the air suction pipe extends along a length direction, the branch pipes extend along a radial direction and are spaced apart along the length direction, the air suction port and the air outlet port are located at opposite ends of the extension direction of the branch pipes, and the air outlet port and the air inlet port are located at the same side of the air suction pipe.

According to another embodiment of the present invention, the main pipe extends in the radial direction, the main pipe and the plurality of branch pipes are located on the same straight line in the length direction, and a depth of each of the branch pipes inserted into the suction pipe in the radial direction is greater than a depth of the main pipe inserted into the suction pipe.

According to another specific embodiment of the present invention, a plurality of the branched pipes are arranged at equal intervals in the length direction; and/or the main pipe is positioned in the middle of the air suction pipe, and the branch pipes are positioned on two sides of the main pipe; and/or, along the radial direction, each branch pipe is embedded into the suction pipe to the same depth; and/or, along the radial direction, each branch pipe is embedded into the air suction pipe until the air suction port is close to the inner wall of the air suction pipe.

According to another specific embodiment of the present invention, a baffle is disposed at an end of the main pipe opposite to the air inlet port along the radial direction, and the baffle is configured to allow the gaseous refrigerant to flow into the suction pipe from a side wall of the main pipe after entering the main pipe from the air inlet port.

According to another embodiment of the invention, the baffle extends in the length direction and protrudes from the side wall of the main tube.

According to another specific embodiment of the present invention, the heat source device further includes: an oil separator disposed between the compressor unit and the first heat exchanger.

According to another embodiment of the present invention, each of the compressors corresponds to one of the oil separators.

According to another embodiment of the present invention, the method further comprises: and the exhaust pipe is respectively connected with each compressor and the first heat exchanger, and the heat exchange medium formed by each compressor is supplied to the first heat exchanger through the exhaust pipe.

According to another embodiment of the present invention, the method further comprises: the first refrigerating device and the first condensing tank are respectively connected with the second steam outlet and the distilled water tank, and the heat exchange medium in the first heat exchanger can flow into the first refrigerating device and flow back to the compressor unit through the first condensing tank; the second steam flowing into the first condensation tank may be cooled by the heat exchange medium and then may flow into the distilled water tank.

According to another specific embodiment of the present invention, the heat source device further includes: the second condensation tank is connected with the second heat exchanger, the first condensation tank and the distilled water tank, and the heat exchange medium in the first heat exchanger can flow into the first refrigeration device and flow back to the compressor unit through the second condensation tank and the first condensation tank; the first steam flowing into the second condensation tank may be cooled by the heat exchange medium and then may flow into the distilled water tank.

According to another embodiment of the invention, the first and second cooling devices are expansion valves or capillary tubes.

According to another embodiment of the present invention, the method further comprises: preheating device and heat sink, preheating device with the second evaporating pot is connected, preheating device is used for right waste liquid in the second evaporating pot preheats, heat sink with the distilled water jar is connected, is used for right the distilled water cooling in the distilled water jar.

According to another specific embodiment of the present invention, the third heat exchanger and the fourth heat exchanger have the same structure, the third heat exchanger includes a plurality of mosquito coil pipes connected in parallel and arranged in parallel along an axial direction, a first pipe and a second pipe, the axial direction is perpendicular to a radial direction of the mosquito coil pipes, an inlet of each mosquito coil pipe is connected to the first pipe, an outlet of each mosquito coil pipe is connected to the second pipe, and the heat exchange medium can flow into each mosquito coil pipe through the first pipe and flow out from the second pipe.

According to another embodiment of the invention, each mosquito coil is arranged such that the heat exchange medium flows from the inlet into the inside of the mosquito coil and is coiled to the outside and is discharged from the outlet.

According to another embodiment of the invention, the inner side of each mosquito coil is connected with the first pipeline, and the outer side of each mosquito coil is connected with the second pipeline.

According to another specific embodiment of the invention, adjacent mosquito coil pipes are arranged at intervals.

According to another specific embodiment of the invention, the third heat exchanger further comprises a fixing device for fixing each mosquito coil, and the fixing device comprises a fixing plate corresponding to the mosquito coil and a positioning plate located outside the mosquito coil; the fixing plates extend along the radial direction of the mosquito coil and are fixed on the positioning plates, each fixing plate is provided with a clamping groove corresponding to the pipe diameter of the mosquito coil, the mosquito coil is clamped with the clamping grooves, and the positioning plates extend along the axial direction; and/or each layer of the mosquito-repellent incense coil corresponds to a plurality of fixing plates arranged at intervals along the circumferential direction of the mosquito-repellent incense coil, and a plurality of positioning plates are arranged at intervals along the circumferential direction; and/or a plurality of clamping grooves are formed in each fixing plate and distributed in the radial direction, and the pipeline of each mosquito coil is clamped in each clamping groove circle by circle.

Drawings

FIG. 1 is a first block diagram of an evaporative concentration system according to an embodiment of the present invention;

FIG. 2 is a block diagram I of a compressor unit in an evaporative concentration system according to an embodiment of the present invention;

FIG. 3 is a first perspective view of a compressor package of an evaporative concentration system in accordance with an embodiment of the present invention;

FIG. 4 is a second perspective view of a compressor unit in an evaporative concentration system in accordance with an embodiment of the present invention;

FIG. 5 is a perspective view of the suction line of the compressor unit in the evaporative concentration system according to an embodiment of the present invention;

FIG. 6 is a perspective view of a heat exchanger in an evaporative concentration system according to an embodiment of the present invention;

FIG. 7 is a block diagram of a second embodiment of the evaporative concentration system of the present invention;

FIG. 8 is a block diagram showing a third embodiment of the evaporative concentration system of the present invention;

FIG. 9 is a block diagram of an evaporative concentration system according to an embodiment of the present invention;

FIG. 10 is a schematic view of a condensate tank of an evaporative concentration system according to an embodiment of the present invention;

fig. 11 is an exploded perspective view of an evaporator tank of an evaporative concentration system according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides an evaporative concentration system comprising: the first evaporation tank 1 is provided with a first water inlet pipeline 2, a first steam outlet, a first concentrated solution outlet and a first concentrated solution discharging pump 3; a second evaporator 19 having a second water inlet pipe 33, a second steam outlet, a second concentrated solution outlet, and a second concentrated solution discharge port, and a second concentrated solution pump 3a (see fig. 7); a pressure reducing device for evacuating the first and

second evaporators

1 and 19; the first heat exchanger 5 is connected with the first evaporation tank 1 through a first liquid inlet pipeline 21 and a first liquid return pipeline 22, and a first liquid inlet pump 4 is arranged on the first liquid inlet pipeline 21; the heat source device 7 is connected with the first heat exchanger 5 through a first heat source pipeline 24 and is used for providing a heat exchange medium for the first heat exchanger 5; the second heat exchanger 20 is connected with the first steam outlet through a first steam outlet pipeline 23, the second heat exchanger 20 is connected with the second evaporation tank 19 through a second liquid inlet pipeline 29 and a second liquid return pipeline 34, and a second liquid inlet pump 17 is arranged on the second liquid inlet pipeline 29; and a distilled water tank 38 connected to the second heat exchanger 20 through the first distilled water pipe 26 and connected to the second steam outlet through the second distilled water pipe 30.

Alternatively, the first steam outlet is provided at the top of the first evaporation tank 1, and the first concentrated solution outlet is provided at the bottom of the first evaporation tank 1. Alternatively, the second vapor outlet is provided at the top of the second evaporation tank 19, and the second concentrated liquid discharge port is provided at the bottom of the second evaporation tank 19.

When waste liquid treatment is carried out, after the first evaporation tank 1 and the second evaporation tank 19 are started, the two evaporation tanks are simultaneously vacuumized through the operation of a pressure reducing device, and the vacuum degree in the tanks is selected according to the boiling point, for example, the vacuum degree corresponding to the boiling point of 25-45 ℃; after the vacuum degree reaches, the first evaporating pot 1 enters waste liquid from the first water inlet pipeline 2, the second evaporating pot 19 enters waste liquid from the second water inlet pipeline 33, and the waste liquid enters the two evaporating pots.

Waste liquid in the first evaporating pot 1 is conveyed to flow into the first heat exchanger 5 through the first liquid inlet pipeline 21 and the first liquid inlet pump 4, the waste liquid is heated by a heat exchange medium flowing into the first heat exchanger 5 from the first heat source pipeline 24, and then flows back to the first evaporating pot 1 from the first heat exchanger 5 through the first liquid return pipeline 22, the waste liquid is evaporated in the first evaporating pot 1 to form first water vapor, the first water vapor flows into the second heat exchanger 20, the evaporation temperature is 25-45 ℃, and hot water circulation is formed. After the waste liquid is evaporated, supplement the waste liquid in to first evaporating pot 1 through first inlet channel 2, discharge the concentrate that forms after the waste liquid evaporates in the first evaporating pot 1 through first row of concentrate pump 3.

The second liquid inlet pump 17 and the first liquid inlet pump 4 are simultaneously started, the waste liquid in the second evaporation tank 19 flows into the second heat exchanger 20 through the second liquid inlet pipeline 29 and the second liquid inlet pump 17, is heated by the first water vapor generated by the first evaporation tank 1 in the second heat exchanger 20, and flows back to the second evaporation tank 19 from the second heat exchanger 20 through the second liquid return pipeline 34. The waste liquid is evaporated in the second evaporator 19 to form second water vapor. After the waste liquid is partially evaporated, the waste liquid is replenished into the second evaporation tank 19 through the second water inlet pipe 33, and the concentrated solution formed by evaporating the waste liquid in the second evaporation tank 19 is discharged through the second discharge concentrated solution pump 3 a.

The first water vapor is liquefied into distilled water by heat exchange with the cold waste liquid in the second heat exchanger 20, the liquefied first water vapor flows into the distilled water tank 38 through the first distilled water pipe 26, the second water vapor formed by evaporation of the waste liquid in the second evaporation tank 19 can be liquefied (for example, liquefied by the first condensation tank 16 described later) into distilled water, the liquefied second water vapor flows into the distilled water tank 38 through the second distilled water pipe 30, and the distilled water tank 38 collects the liquefied first water vapor and second water vapor and discharges the distilled water in the distilled water tank 38 by the distilled water discharge pump 12.

Therefore, the evaporation concentration system is provided with at least two evaporation tanks, and the two evaporation tanks simultaneously carry out evaporation concentration treatment on the waste liquid, so that the treatment efficiency of the waste liquid is improved; moreover, the first water vapor generated by the first evaporation tank 1 is used for heating the waste liquid in the second evaporation tank 19 to form the second water vapor, and meanwhile, the liquefaction of the first water vapor is realized, so that the vapor energy is effectively utilized, and the energy is saved.

Referring to fig. 2 to 4, the heat source device 7 is a heat pump system including: the heat exchanger comprises a compressor set and an air inlet 4211, wherein the compressor set comprises a plurality of compressors 41 arranged in parallel, each compressor 41 is respectively connected with the air inlet 4211 and the first heat exchanger 5, and the air inlet 4211 is used for distributing gaseous refrigerant to each compressor 41 to form a heat exchange medium provided for the first heat exchanger 5. Alternatively, the gaseous refrigerant distributed to each compressor 41 is a low-temperature low-pressure gaseous refrigerant, and under the action of the compressor 41, the low-temperature low-pressure gaseous refrigerant is changed into a high-temperature high-pressure gaseous refrigerant (i.e., a heat exchange medium), and the waste liquid from the first evaporation tank 1 is heated in the first heat exchanger 5.

By arranging the compressor unit, the plurality of compressors 41 are connected in parallel, overlapped and integrated, so that the output energy of the integrated compressor unit is increased, and the throughput of the evaporation concentration system is improved on the premise of ensuring high energy efficiency. In addition, the integrated compressor unit can adopt compressors with unequal size and ratio to provide more adjusting stages, so that the refrigerant output is more smoothly and dynamically matched with the actual load.

In this embodiment, four compressors 41 are arranged in parallel in the compressor unit, but the number of the compressors 41 in the compressor unit is not limited, and a corresponding number of the compressors 41 may be selectively arranged according to the processing requirement.

With continued reference to fig. 1, the first heat exchanger 5 of the present application is located outside the first evaporator tank 1 and the second heat exchanger 20 is located outside the second evaporator tank 19. The heat exchanger adopts external type and cooperation evaporation reposition of redundant personnel subassembly 40, has reduced the production of foam in the evaporation process on the one hand, and on the other hand is convenient for wash after the heat exchanger scale deposit. Optionally, the first heat exchanger 5 is located outside the first evaporator tank 1, or alternatively, the second heat exchanger 20 is located outside the second evaporator tank 19.

With continued reference to fig. 1 and 9, the evaporative concentration system of the present application further includes: preheating device 46 and heat sink 47, preheating device 46 is connected with second evaporating pot 19, and preheating device 46 is used for preheating the waste liquid in the second evaporating pot 19, and heat sink 47 is connected with distilled water jar 38 for the distilled water cooling in distilled water jar 38.

When the evaporation concentration system is just started, enough first water vapor is not generated in the first evaporation tank 1 to heat the waste liquid in the second evaporation tank 19, the second evaporation tank 19 is often started slowly in the actual operation process, so that the first condensation tank 16 cannot work normally, and the heat source device 7 is in a low-load operation state. Then, in this embodiment, the preheating device 46 is added in the evaporation concentration system, and after the waste liquid is fed into the second evaporation tank 19, the preheating device 46 is turned on to heat the waste liquid, so that the evaporation concentration system is rapidly started to avoid that the heat source device 7 is in a low-load operation state; meanwhile, the cooling device 47 cools the distilled water in the distilled water tank 38, so as to ensure the normal operation of the pressure reducing device.

In conclusion, the whole evaporation concentration system can normally operate and effectively treat waste liquid.

Optionally, the pressure reducing device adopts a double-vacuum-pumping system to separately control the vacuum degrees in the first evaporation tank 1 and the second evaporation tank 19, so that the equipment runs stably. That is, the pressure reducing device evacuates the first evaporation tank 1, and the first evaporation tank 1 has a first vacuum degree; the pressure reducing device vacuums the second evaporation tank 19, and the second evaporation tank 19 has a second degree of vacuum. Optionally, the first vacuum degree is less than the second vacuum degree, and the higher the vacuum degree is, the lower the pressure in the tank is; accordingly, the boiling point of the waste liquid in the first evaporation tank 1 is high, the temperature of the first steam generated by evaporation of the waste liquid is high, and the waste liquid from the second evaporation tank 19 is heated in the second heat exchanger 20, so that the entire system performs stable energy conversion.

Alternatively, referring to fig. 1, the pressure reducing device includes a first centrifugal water pump 15, a second centrifugal water pump 13, a first ejector 36, and a second ejector 37, the first centrifugal water pump 15 connects the first ejector 36 and the distilled water tank 38, the second centrifugal water pump 13 connects the second ejector 37 and the distilled water tank 38, the first ejector 36 connects the distilled water tank 38, the second heat exchanger 20, and the first evaporator tank 1, and the second ejector 37 connects the distilled water tank 38 and the second evaporator tank 19. After the first centrifugal water pump 15 and the second centrifugal water pump 13 are turned on, the vacuum degrees in the first evaporation tank 1 and the second evaporation tank 19 are gradually increased, and finally, the vacuum degrees are maintained at a high vacuum degree. Optionally, the vacuum degree in the first evaporation tank 1 is lower than the vacuum degree in the second evaporation tank 19 by 2KPa to 5KPa, so that the water evaporation temperature in the first evaporation tank 1 is higher than the water evaporation temperature in the second evaporation tank 19 by 5 ℃ to 10 ℃, and the first water vapor heats the waste liquid in the second evaporation tank 19, thereby performing stable energy conversion on the whole system.

Alternatively, the pressure reducing device may be operated by using a pump (e.g., a vacuum pump) in cooperation with a valve assembly, or two pressure reducing devices and two distilled water pipes may be provided to connect each of the evaporators.

With continued reference to fig. 2 to 5, the heat source device 7 further includes: the suction pipe 42, the suction pipe 42 extends along a length direction (shown in an X direction in fig. 5), the suction pipe 42 is provided with an inlet port 4211 and an outlet port 4222, the inlet port 4211 is used for providing gaseous refrigerant into the suction pipe 42, and the outlet port 4222 is connected with each compressor 41 to distribute the gaseous refrigerant in the suction pipe 42 to each compressor 41. The gas refrigerant is distributed to each compressor 41 through the suction pipe 42, so that the uniform suction of the compressor 41 can be promoted, the efficiency of each compressor 41 can be fully exerted, the heat treatment efficiency of the whole compressor unit can be improved, the liquid impact can be prevented, and the service life of the compressor unit can be prolonged.

Referring to fig. 5, the suction pipe 42 includes a main pipe 421 and branch pipes 422 corresponding to the compressors 41 one to one, the main pipe 421 is provided with an air inlet port 4211, the branch pipes 422 have an air outlet port 4222 and a suction port 4221, and the suction port 4221 is located inside the suction pipe. That is, the gaseous refrigerant is introduced into the suction pipe 42 through the inlet port 4211 of the main pipe 421, and the suction port 4221 of each branch pipe 422 distributes the gaseous refrigerant in the suction pipe 42 to each compressor 41 through the outlet port 4222. With this arrangement, the gaseous refrigerant can be uniformly distributed to each of the compressors 41. In this embodiment, the number of the compressors 41 is four, and correspondingly, the number of the branch pipes 422 is also four; in other embodiments, the number of manifolds 422 is uniformly adjusted based on the number of compressors 41.

Referring to fig. 5, the air suction pipe 42 extends in the longitudinal direction, the air suction pipe 42 has a cylindrical shape, and the ends of the air suction pipe 42 in the longitudinal direction are provided with sealing heads 420, that is, the ends of the air suction pipe 42 in the longitudinal direction are closed. The branch pipes 422 extend in the radial direction (indicated by Y direction in fig. 5) and are spaced apart in the longitudinal direction, and the air suction port 4221 and the air outlet port 4222 are located at opposite ends of the extension direction of the branch pipes 422, that is, the air suction port 4221 of the branch pipe 422 is located in the air suction pipe 42, and the air outlet port 4222 and the air inlet port 4211 are located at the same side of the air suction pipe 42.

Alternatively, the main pipe 421 extends along the radial direction, the main pipe 421 and the plurality of branch pipes 422 are located on the same straight line along the length direction, and the depth of each branch pipe 422 embedded into the air suction pipe 42 along the radial direction is greater than the depth of the main pipe 421 embedded into the air suction pipe 42. This arrangement facilitates the distribution of the gaseous refrigerant in the suction pipe 42 to each compressor 41 through the discharge port 4222 by the suction port 4221 of each branch pipe 422.

Alternatively, the plurality of branched pipes 422 are arranged at equal intervals in the length direction. With this arrangement, the gaseous refrigerant can be uniformly distributed to each of the compressors 41.

Alternatively, the main pipe 421 is located at a middle position of the suction pipe 42, and the plurality of branch pipes 422 are located at both sides of the main pipe 421. That is, the gaseous refrigerant is collected at the middle position of the suction pipe 42, and then is diffused from the middle position of the suction pipe 42 to the branch pipes 422, and is supplied to each compressor 41 from each branch pipe 422. The uniform suction of the compressor 41 can be promoted, and the efficiency of each compressor 41 can be sufficiently exhibited. However, the position of the main pipe 421 and the position of the branch pipe 422 are not limited to this, and may be selected as needed.

Alternatively, each of the branched tubes 422 is radially embedded to the same depth in the air suction pipe 42. So that the gaseous refrigerant can be uniformly delivered to each compressor 41 by each branched pipe 422.

Alternatively, each branch 422 is radially embedded in the suction pipe 42 such that the suction port 4221 is close to the inner wall of the suction pipe 42. That is, the suction port 4221 of the branch pipe 422 sucks the gaseous refrigerant at the bottom of the suction pipe 42, so that the liquid fluid in the gaseous refrigerant is deposited at the bottom of the suction pipe 42, the gaseous refrigerant is sucked by the compressor 41, and the liquid fluid is vaporized and then can be sucked. This setting mode makes on the one hand can guarantee that the gaseous refrigerant is given vent to anger evenly, and on the other hand can avoid the liquefied water to enter into in the branch pipe 422, can effectively prevent compressor 41 liquid hammer, protection compressor 41.

Alternatively, referring to fig. 5, a baffle 4212 is provided at an end of the main pipe 421 opposite to the air inlet port 4211 in the radial direction, and the baffle 4212 is used to allow the gaseous refrigerant to flow into the air suction pipe 42 from the side wall of the main pipe 421 after entering the main pipe 421 through the air inlet port 4211. That is, one end of the main pipe 421 in the radial direction opposite to the air inlet port 4211 is closed, and after the gaseous refrigerant enters the main pipe 421 from the air inlet port 4211, the gaseous refrigerant flows into the air intake pipe 42 not in the radial direction but flows into the air intake pipe 42 from the side wall of the main pipe 421 and spreads all around.

The arrangement mode can ensure that the low-temperature and low-pressure gaseous refrigerant entering from the air inlet port 4211 is uniformly distributed to the upper part of the inner cavity of the air suction pipe 42 through the baffle 4212, when the upper part of the inner cavity of the air suction pipe 42 is fully filled with the gaseous refrigerant, the gaseous refrigerant is uniformly dispersed and then is diffused to the lower part of the inner cavity of the air suction pipe 42, and then enters the branch pipe 422 from the air suction port 4221 of the branch pipe 422, so that the gaseous refrigerant is uniformly distributed to each compressor 41. Alternatively, in the present embodiment, the air suction port 4221 is an oblique opening disposed at the bottom of the branch pipe 422, so that the liquid fluid in the gaseous refrigerant is deposited at the bottom of the air suction pipe 42, the gaseous refrigerant is pumped by the compressor 41, and the liquid fluid is vaporized and then pumped away. Above-mentioned mode of setting up can guarantee on the one hand that gaseous refrigerant is given vent to anger evenly, and on the other hand can avoid the liquefied water to enter into in the branch pipe 422, can effectively prevent compressor 41 liquid impact, protects compressor 41.

Optionally, the baffles 4212 extend lengthwise and project out of the side walls of the main tube 421. The portion of the baffle 4212 protruding out of the side wall of the main pipe 421 plays a guiding role, and guides the gaseous refrigerant to enter the main pipe 421 from the air inlet port 4211, and then to diffuse from the side wall of the main pipe 421 toward the periphery of the inner cavity of the air suction pipe 42.

Alternatively, referring to fig. 1 and 2, the heat source device 7 further includes: an oil separator system 6, the oil separator system 6 being provided between the compressor unit and the first heat exchanger 5. Optionally, the oil separator system 6 includes a plurality of oil separators 43, one oil separator 43 for each compressor 41. When the compressor unit is in use, oil in the compressor unit tends to flow out of the compressor 41, and after the oil separators 43 are arranged, each oil separator 43 is connected with the compressor unit through an oil return system 8, and the oil return system 8 comprises a valve 431, an oil filter 432 and an electronic oil level balancer 433 which are arranged on an oil circulation pipeline. The high-temperature and high-pressure heat exchange medium (mostly in liquid state) pressed out by the compressor 41 is separated from the oil in the oil separator 43, so that stable oil return can be realized, and the compressor 41 is ensured to work stably and has long service life.

Alternatively, referring to fig. 2 to 4, the heat source device 7 further includes: a discharge pipe 44, the discharge pipe 44 connecting each compressor 41 and the first heat exchanger 5, respectively, the heat exchange medium formed by each compressor 41 being supplied to the first heat exchanger 5 via the discharge pipe 44. The compressor set uniformly discharges air through exhaust pipes 44, and the exhaust pipes 44 are respectively connected with the first heat exchanger 5. The high-temperature high-pressure heat exchange medium of the oil separated by each oil separator 43 uniformly enters the exhaust pipe 44 and then enters the first heat exchanger 5.

Alternatively, referring to fig. 1, the heat source device 7 further includes: the first refrigeration device 14 and the first condensation tank 16, the first condensation tank 16 is connected with the second steam outlet and the distilled water tank 38 respectively, in this embodiment, the first condensation tank 16 is arranged on the second distilled water pipeline 30, and the second distilled water pipeline 30 is connected with the second ejector 37. The heat exchange medium in the first heat exchanger 5 can flow into the first refrigeration device 14 and flow back to the compressor set via the first condensation tank 16; the second steam flowing into the first condensation tank 16 can be cooled by the heat exchange medium and then flows into the distilled water tank 38.

Optionally, the first cooling device 14 is an expansion valve or a capillary tube. The liquid heat exchange medium flows through the first refrigeration device 14 through the pipeline 25 and enters the first condensation tank 16, in the process, the liquid heat exchange medium with medium temperature and high pressure is converted into the gaseous heat exchange medium with low temperature and low pressure through the throttling function of the first refrigeration device 14, and simultaneously absorbs a large amount of external heat, so that the second water vapor from the second evaporation tank 19 is subjected to heat exchange in the first condensation tank 16 to reduce the temperature thereof, a cooling effect is achieved, and the second water vapor is liquefied into distilled water and collected by the distilled water tank 38.

Alternatively, referring to fig. 1, the heat source device 7 further includes: a second refrigerating device 9 and a second condensation tank 10, in this embodiment, the second condensation tank 10 is disposed on the first distilled water pipeline 26, the first distilled water pipeline 26 is connected with the first ejector 36, and the second condensation tank 10 is connected with the second heat exchanger 20, the first condensation tank 16 and the distilled water tank 38. Alternatively, the second cooling device 9 is an expansion valve or a capillary tube. The heat exchange medium in the first heat exchanger 5 can flow into the first refrigerating device 14 and flow back to the compressor unit through the second condensing tank 10 and the first condensing tank 16; the first steam flowing into the second condensation tank 10 can be cooled by the heat exchange medium and then flows into the distilled water tank 38.

The applicant has found that the first steam generated by the first evaporation tank 1 has a higher heat quantity after heating the waste liquid of the second evaporation tank 19, which results in waste of heat energy, a higher distilled water temperature, and instability of the vacuum-pumping system (the air-pumping quantity of the vacuum-pumping system is determined by the power of the vacuum-pumping system, if the distilled water temperature is too high, the distilled water is vaporized into steam under the condition of higher vacuum degree, and therefore, the air pumped by the vacuum-pumping system in the whole device is squeezed, and the vacuum-pumping effect of the vacuum-pumping system is poor). Therefore, in the present embodiment, the steam waste heat of the first evaporation tank 1 is recovered by providing the second condensation tank 10.

Therefore, one path of the liquid heat exchange medium in the first heat exchanger 5 flows through the first refrigeration device 14 through the pipeline 25 and enters the first condensation tank 16, and the other path of the liquid heat exchange medium flows through the second refrigeration device 9 and enters the second condensation tank 10, in the process, the liquid heat exchange medium with medium temperature and high pressure is converted into the gaseous heat exchange medium with low temperature and low pressure through the throttling action of the second refrigeration device 9, and simultaneously absorbs a large amount of external heat, so that the first water vapor from the second heat exchanger 20 is subjected to heat exchange in the second condensation tank 10, the steam waste heat of the first evaporation tank 1 is recovered, the temperature of the steam waste heat is reduced, the cooling effect is achieved, distilled water is formed, and the distilled water flowing into the distilled water tank 38 from the second condensation tank 10 is low in temperature.

In addition, the low-temperature and low-pressure gaseous heat exchange medium in the second condensation tank 10 enters the first condensation tank 16 through the pipeline 27, and exchanges heat with the second water vapor from the second evaporation tank 19 in the first condensation tank 16 together with the low-temperature and low-pressure gaseous heat exchange medium from the other path of the above embodiment to reduce the temperature of the second water vapor and improve the cooling effect, the two paths of gaseous refrigerants collected in the first condensation tank 16 absorb the steam heat energy of the second evaporation tank 19, the refrigerants are gasified and condensed, the two paths of refrigerant vapors are collected to the copper pipeline 28 and then return to the compressor 41 unit to form a closed cycle of the refrigerants.

Alternatively, referring to fig. 1, the preheating device 46 includes: an auxiliary compressor 18 and a third heat exchanger 35, the third heat exchanger 35 being located in the second evaporator tank 19; the temperature reducing device 47 comprises a third refrigerating device 45 and a fourth heat exchanger 11, and the fourth heat exchanger 11 is positioned in the distilled water tank 38. In this embodiment, the preheating device 46 and the cooling device 47 are linked and connected to each other. Specifically, the second evaporation tank 19 and the distilled water tank 38 are connected through a pipe 32 and a pipe 32a, the auxiliary compressor 18 is provided on the pipe 32, and the third refrigeration device 45 and the wind condenser 39 are provided on the pipe 32 a.

The heat exchange medium can form a preheating medium through the auxiliary compressor 18 to preheat the waste liquid in the second evaporation tank 19; the preheating medium flows into the third heat exchanger 35, the preheating medium can flow into the third refrigerating device 45 through the air condenser 39 to form a cooling medium, the cooling medium flows into the fourth heat exchanger 11 to cool the distilled water in the distilled water tank 38, and the cooling medium flows back to the auxiliary compressor 18 through the fourth heat exchanger 11 to form refrigerant circulation. Optionally, the third cooling device 45 is an expansion valve or a capillary tube. The third refrigerating device 45 may also be a heat pump system, or may also be other cooling devices, such as semiconductor refrigerating sheets.

Alternatively, referring to fig. 9, the preheating device 46 and the temperature reduction device 47 are separate two sets of devices, independent of each other.

Alternatively, referring to fig. 6, the third heat exchanger 35 and the fourth heat exchanger 11 have the same structure, and the third heat exchanger 35 is exemplified, and the third heat exchanger 35 includes a plurality of mosquito coil coils 351 which are arranged in parallel and in parallel along the axial direction (shown in the Z direction in fig. 6), and the first and

second pipes

353 and 354 are axially perpendicular to the radial direction (shown in the M direction in fig. 6) of the mosquito coil coils 351. That is, a plurality of coils 351 are stacked one on another in the axial direction.

The inlet of each mosquito coil 351 is connected with the first pipeline 353, the outlet of each mosquito coil 351 is connected with the second pipeline 354, and the heat exchange medium can flow into each mosquito coil 351 through the first pipeline 353 and flow out from the second pipeline 354. That is, the first and

second pipes

353 and 354 are provided with through holes (not shown) for respectively connecting the inlet and outlet of each mosquito coil 351. The heat exchange medium enters the first pipe 353 and is uniformly distributed to each mosquito coil 351 through the through holes in the first pipe 353, then is collected to the second pipe 354 from the outlet of each mosquito coil 351, and finally is output by the second pipe 354.

The traditional coil heat exchanger has the advantages that when the rated heat exchange area is fixed, the span of a single whole group of coils is large, so that the manufacturing difficulty is large, the energy of a heat exchange medium cannot be fully converted, and the heat exchange efficiency is low. And the multiunit mosquito-repellent incense coil 351 of this application is parallelly connected and parallel arrangement, and reducible its span and refrigerant (also be heat transfer medium) are at the circulation distance of its inside, guarantee that its heat exchange efficiency is high and stable, are convenient for make simultaneously and dismouting installation to make things convenient for later maintenance and maintenance.

Alternatively, each coil 351 is arranged such that the heat transfer medium flows from the inlet into the inside of the coil 351 and spirals outward for output from the outlet. That is, the refrigerant (e.g., fluid) is disposed in the mosquito coil 351 to be output from the inner side of the coil to the outer side, so as to reduce the resistance applied to the refrigerant during the flowing process, thereby avoiding the system pressure drop and ensuring the heat treatment efficiency of the compressor unit. Optionally, the inner side of each mosquito coil 351 is connected to the first pipe 353 to input the heat exchange medium to the inner side of the mosquito coil 351, and the outer side of the mosquito coil 351 is connected to the second pipe 354 to output the heat exchange medium from the outer side of the mosquito coil 351.

Optionally, adjacent coils 351 are spaced apart to increase their heat transfer area and facilitate later maintenance and repair.

Optionally, the third heat exchanger 35 further comprises a fixing device 352 for fixing each mosquito coil 351. The fixing device 352 comprises a fixing plate 321 corresponding to the mosquito coil 351, and a positioning plate 322 located outside the mosquito coil 351; wherein, the fixed plate 321 extends along mosquito coil 351's radial to be fixed in on the locating plate 322, be equipped with the draw-in groove 3211 that suits with mosquito coil 351's pipe diameter on each fixed plate 321, mosquito coil 351 and draw-in groove 3211 joint, locating plate 322 is along axial extension.

Optionally, each layer of mosquito coil 351 corresponds to a plurality of fixing plates 321 arranged at intervals along the circumferential direction (shown in the direction N in fig. 6) of the mosquito coil 351, and the positioning plates 322 are arranged at intervals along the circumferential direction. In this embodiment, each layer is provided with fixing plates 321 arranged at intervals along the circumferential direction, and four positioning plates 322 are uniformly arranged on the periphery of the mosquito coil 351. Alternatively, each fixing plate 321 may extend radially from the outside of the coil 351 to the inside of the coil 351 to better fix the coil 351.

Optionally, a plurality of slots 3211 are radially disposed on each fixing plate 321, and the pipe of each mosquito coil 351 is clamped into each slot 3211 one by one, so as to fix the mosquito coil 351 better.

Alternatively, referring to fig. 7, the first heat exchanger 5 is located in the first evaporation tank 1, and the second heat exchanger 20 is located in the second evaporation tank 19. That is, the first heat exchanger 5 and the second heat exchanger 20 are built-in type heat exchangers. Alternatively, the first heat exchanger 5 and the second heat exchanger 20 may have the same structure as the third heat exchanger 35 of the above embodiment, i.e., the parallel mosquito coil 351.

Alternatively, referring to fig. 8, the second condensation tank 10 may be eliminated, and the remaining structure is the same as the above-described embodiment.

Optionally, referring to fig. 1, the distilled water tank 38 is provided with a moisture separator 381, so that on one hand, the content of impurities in the liquid in the distilled water tank 38 is reduced, and on the other hand, when the distilled water tank is used in combination with a pressure reducing device, the vacuum pumping effect of the whole device can be enhanced, so that the waste liquid in the first evaporation tank 1 and the second evaporation tank 19 can be separated into gas as soon as possible, thereby accelerating the treatment efficiency and reducing the treatment cost.

Alternatively, the first condensation tank 16 and the second condensation tank 10 have the same structure, and referring to fig. 10, the structure of the first condensation tank 16 is illustrated, the first condensation tank 16 includes an outer cylinder 61 and a cold water pipe group 62 disposed in the outer cylinder 61 and connected to the second evaporation tank 19 and the distilled water tank 38, and the steam generated by the second evaporation tank 19 enters the cold water pipe group 62 through a pipeline, is cooled by the refrigerant in the outer cylinder 61, and then enters the distilled water tank 38.

Optionally, referring to fig. 11, in this embodiment, in order to avoid that the water vapor evaporated from the evaporation tank carries other insoluble particles into the condensation tank and the distilled water tank 38, a vapor purification device is further provided in the evaporation tank. Alternatively, the first evaporation tank 1 and the second evaporation tank 19 are identical in structure, taking the structure of the first evaporation tank 1 as an example. Specifically, the steam purification device is disposed above the first heat exchanger 5 and below the first steam outlet 1a, and includes a plurality of anti-entrainment baffles 131 arranged along the depth direction of the first evaporation tank 1 in a staggered manner, and a filter purifier 132 disposed above the anti-entrainment baffles 131.

The anti-pinch baffle 131 includes at least two partition plates disposed in a staggered manner in the vertical direction, and in the present embodiment, the anti-pinch baffle includes an upper partition plate 1311 and a lower partition plate 1312, and the upper partition plate 1311 and the lower partition plate 1312 are disposed in a staggered manner in the depth direction. During the rising process of the first water vapor formed by the evaporation of the waste liquid, the foam and other impurities are blocked by the partition plates and attached to the partition plates, and the gas continues to rise through the interval between the upper partition plate 1311 and the lower partition plate 1312. In other embodiments, a greater number of baffles may be used.

The filter purifier 132 of the present embodiment includes a packing support screen 1321 disposed above the anti-pinch baffle 131 and a purification packing 1322 placed on the packing support screen 1321, and in the present embodiment, the purification packing 1322 preferably employs a pall ring labyrinth packing. The manhole is opened at the corresponding position of first evaporating pot 1, and the boule ring labyrinth packing accessible manhole adds and changes. Compare in traditional silk screen demister, adopt the structure of this embodiment, can not the scale deposit and block up and removable reuse, maintenance and maintenance cost reduce.

In this embodiment, the first evaporation tank 1 is composed of an upper tank 1c, a middle tank 1e and a lower tank 1f, and the upper tank 1c and the middle tank 1e and the lower tank 1f are mechanically connected by a flange 1d, so as to facilitate disassembly, maintenance and repair. Wherein, the first steam outlet 1a is arranged at the top of the upper tank 1c, and the first concentrated solution outlet 1b is arranged at the bottom of the lower tank 1 f.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An evaporative concentration system, comprising:

the first evaporation tank is provided with a first steam outlet and a first concentrated solution outlet;

the second evaporation tank is provided with a second steam outlet and a second concentrated solution outlet;

the pressure reducing device is used for vacuumizing the first evaporation tank and the second evaporation tank;

the first heat exchanger is connected with the first evaporation tank and is positioned outside the first evaporation tank;

a heat source device, the heat source device comprising: the compressor unit comprises a plurality of compressors arranged in parallel, each compressor is connected with the air inlet and the first heat exchanger, the air inlet is used for distributing gaseous refrigerant to each compressor to form a heat exchange medium provided for the first heat exchanger, waste liquid in the first evaporation tank can flow into the first heat exchanger, is heated by the heat exchange medium, and flows back to the first evaporation tank from the first heat exchanger to be evaporated to form first water vapor;

the second heat exchanger is connected with the first steam outlet and the second evaporation tank and is positioned outside the second evaporation tank, and waste liquid in the second evaporation tank can flow into the second heat exchanger, is heated by the first water vapor, flows back to the second evaporation tank from the second heat exchanger and is evaporated to form second water vapor;

the distilled water tank is connected with the second heat exchanger and the second steam outlet and is used for collecting the first water vapor and the second water vapor which are liquefied;

the cooling device is connected with the distilled water tank and used for cooling the distilled water in the distilled water tank; the preheating device is linked with the cooling device;

the preheating device includes: an auxiliary compressor and a third heat exchanger, the third heat exchanger located within the second evaporator tank; the cooling device comprises a third refrigerating device and a fourth heat exchanger, and the fourth heat exchanger is positioned in the distilled water tank; a heat exchange medium can form a preheating medium through the auxiliary compressor, the preheating medium flows into the third heat exchanger, the preheating medium can flow into the third refrigerating device to form a cooling medium, and the cooling medium flows into the fourth heat exchanger and flows back to the auxiliary compressor through the fourth heat exchanger;

the heat source device further includes: the air suction pipe is provided with the air inlet port and an air outlet port, the air inlet port is used for providing the gaseous refrigerant into the air suction pipe, and the air outlet port is connected with each compressor so as to distribute the gaseous refrigerant in the air suction pipe into each compressor; the air suction pipe comprises a main pipe and branch pipes which correspond to the compressors one by one, the main pipe is provided with the air inlet port, the branch pipes are provided with the air outlet port and the air suction port, and the air suction port is positioned in the air suction pipe;

further comprising: the first refrigerating device and the first condensing tank are respectively connected with the second steam outlet and the distilled water tank, and the heat exchange medium in the first heat exchanger can flow into the first refrigerating device and flow back to the compressor unit through the first condensing tank; the second steam flowing into the first condensation tank can be cooled by the heat exchange medium and then flows into the distilled water tank;

further comprising: the second condensation tank is connected with the second heat exchanger, the first condensation tank and the distilled water tank, the heat exchange medium in the first heat exchanger can flow into the first refrigeration device, and the heat exchange medium in the first heat exchanger can flow back to the compressor unit through the second condensation tank and the first condensation tank; the first steam flowing into the second condensation tank may be cooled by the heat exchange medium and then may flow into the distilled water tank.

2. The evaporative concentration system of claim 1, wherein the suction pipe extends along a length direction, a plurality of the branch pipes extend in a radial direction and are spaced apart along the length direction, the suction port and the discharge port are located at opposite ends of the extension direction of the branch pipes, and the discharge port are located at the same side of the suction pipe.

3. The evaporative concentration system as set forth in claim 2, wherein said main tube extends in said radial direction, said main tube and said plurality of branch tubes are located in a same line in said longitudinal direction, and each of said branch tubes is inserted into said suction tube to a greater depth in said radial direction than said main tube is inserted into said suction tube.

4. The evaporative concentration system as set forth in claim 3, wherein a plurality of said manifolds are arranged at equal intervals along said length direction; and/or the main pipe is positioned in the middle of the air suction pipe, and the branch pipes are positioned on two sides of the main pipe; and/or, along the radial direction, each branch pipe is embedded into the suction pipe to the same depth; and/or, along the radial direction, each branch pipe is embedded into the air suction pipe until the air suction port is close to the inner wall of the air suction pipe.

5. The evaporative concentration system as set forth in claim 3, wherein a baffle is provided at an end of the main tube opposite to the inlet port in the radial direction, the baffle being adapted to allow the gaseous refrigerant to flow from the side wall of the main tube into the suction tube after entering the main tube through the inlet port.

6. The evaporative concentration system of claim 1, wherein the heat source apparatus further comprises: and the exhaust pipe is respectively connected with each compressor and the first heat exchanger, and the heat exchange medium formed by each compressor is supplied to the first heat exchanger through the exhaust pipe.

7. The evaporative concentration system of claim 1, wherein the third heat exchanger and the fourth heat exchanger are identical in structure, the third heat exchanger comprises a plurality of mosquito coil coils which are arranged in parallel and in parallel along an axial direction, a first pipeline and a second pipeline, the axial direction is perpendicular to the radial direction of the mosquito coil coils, an inlet of each mosquito coil is connected with the first pipeline, an outlet of each mosquito coil is connected with the second pipeline, and the heat exchange medium can flow into each mosquito coil through the first pipeline and flow out of the second pipeline.

8. The evaporative concentration system of claim 7, wherein each of the coils is arranged such that the heat transfer medium flows from the inlet into the inside of the coil and spirals outward and out the outlet.

9. The evaporative concentration system of claim 7, wherein the third heat exchanger further comprises a fixing device for fixing each of the coils, the fixing device comprising a fixing plate corresponding to the coil and a positioning plate located outside the coil; wherein, the fixed plate is followed mosquito coil's radial extension, and be fixed in on the locating plate, each be equipped with on the fixed plate with the draw-in groove that mosquito coil's pipe diameter suited, mosquito coil with the draw-in groove joint, the locating plate is followed axial extension.

10. The evaporative concentration system of claim 9, wherein each layer of the mosquito coil is corresponding to a plurality of the fixing plates arranged at intervals along the circumferential direction of the mosquito coil, and the positioning plates are a plurality of the fixing plates arranged at intervals along the circumferential direction.

11. The evaporative concentration system as claimed in claim 9, wherein each of said fixing plates is provided with a plurality of said slots distributed in said radial direction, and the pipe of each of said mosquito coil pipes is engaged with each of said slots one by one.