CN220201506U - Low-temperature negative pressure membrane evaporation assembly - Google Patents
Low-temperature negative pressure membrane evaporation assembly Download PDFInfo
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- CN220201506U CN220201506U CN202321654950.7U CN202321654950U CN220201506U CN 220201506 U CN220201506 U CN 220201506U CN 202321654950 U CN202321654950 U CN 202321654950U CN 220201506 U CN220201506 U CN 220201506U
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- 238000001704 evaporation Methods 0.000 title claims abstract description 83
- 230000008020 evaporation Effects 0.000 title claims abstract description 82
- 239000012528 membrane Substances 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 144
- 238000000926 separation method Methods 0.000 claims abstract description 109
- 239000011148 porous material Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 230000005494 condensation Effects 0.000 claims description 23
- 238000009833 condensation Methods 0.000 claims description 23
- 239000012141 concentrate Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000003507 refrigerant Substances 0.000 description 23
- 239000010408 film Substances 0.000 description 19
- 239000011550 stock solution Substances 0.000 description 14
- 238000005265 energy consumption Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model provides a low-temperature negative pressure membranous evaporation assembly, which comprises a membranous evaporation main body, a steam generator, a first gas-liquid separation chamber and a vacuumizing module, wherein a containing space is arranged in the membranous evaporation main body, the containing space is provided with a first pore plate and a second pore plate, the containing space is divided into a first space positioned below, a first heat exchange space positioned in the middle and a second space positioned above by the first pore plate and the second pore plate, a heat exchange tube is arranged between the first pore plate and the second pore plate in a penetrating way, and two ends of the heat exchange tube are respectively communicated with the first space and the second space; the steam generator is communicated with the first space; the inside of the first gas-liquid separation chamber is provided with a first gas-liquid separation space, and a first channel for communicating the second space with the first gas-liquid separation space and a second channel for communicating the first gas-liquid separation space with the first space are arranged between the membrane evaporation main body and the first gas-liquid separation chamber; the vacuumizing module is connected with the first gas-liquid separation chamber and is communicated with the first gas-liquid separation space.
Description
Technical Field
The utility model relates to the technical field of evaporation and concentration, in particular to a low-temperature negative pressure membrane evaporation assembly.
Background
In the existing low-temperature evaporation process, wastewater enters a heating chamber and is fully soaked in heat exchange tubes positioned in the heating chamber, then, a medium in the heat exchange tubes is utilized to directly exchange heat with a large amount of wastewater, secondary steam is generated, and then, the secondary steam is subjected to gas-liquid separation through a separation chamber. However, this approach has the following problems: because a large amount of wastewater enters the heating chamber and is fully soaked in the heat exchange tubes, the heat exchange coefficient of the wastewater and the heat exchange tubes is lower, the evaporation efficiency is lower, and the energy consumption is higher.
Therefore, it is necessary to provide a low-temperature negative pressure membrane state evaporation component with high evaporation efficiency and energy consumption saving.
Disclosure of Invention
The utility model aims to provide a low-temperature negative pressure film evaporation component with high evaporation efficiency and energy consumption saving.
In order to achieve the above purpose, the utility model provides a low-temperature negative pressure membrane evaporation assembly, which comprises a membrane evaporation main body, a steam generator, a first gas-liquid separation chamber and a vacuumizing module, wherein a containing space is formed in the membrane evaporation main body, a first pore plate and a second pore plate which is positioned above the first pore plate are arranged in the middle of the containing space, the containing space is divided into a first space positioned below, a first heat exchange space positioned in the middle and a second space positioned above the first pore plate by the first pore plate and the second pore plate, a raw liquid inlet which is communicated with the first space is formed in the side wall of the membrane evaporation main body, a first heat exchange inlet and a first heat exchange outlet which are communicated with the first heat exchange space are also formed in the side wall of the membrane evaporation main body, a concentrated liquid outlet which is communicated with the first heat exchange space is formed in the bottom of the membrane evaporation main body, a heat exchange medium enters the first heat exchange space, the first heat exchange outlet is used for the heat exchange medium to leave the first heat exchange space, a plurality of first heat exchange pipes are respectively arranged between the first pore plate and the first heat exchange space and the first heat exchange pipes, and the first heat exchange pipes are respectively communicated with the two ends of the first pore plates; the steam generator is connected with the membrane evaporation main body and is communicated with the first space; a first gas-liquid separation space is formed in the first gas-liquid separation chamber, and a first channel for communicating the second space with the first gas-liquid separation space and a second channel for communicating the first gas-liquid separation space with the first space are arranged between the membrane evaporation main body and the first gas-liquid separation chamber; the vacuumizing module is connected with the first gas-liquid separation chamber and communicated with the first gas-liquid separation space; the steam generator is used for providing preheating steam for the first space so as to preheat stock solution in the first space to a design temperature, then the first space is vacuumized through the first gas-liquid separation chamber and the second channel by the vacuumizing module, so that the stock solution is subjected to phase change and secondary steam is generated, the secondary steam can exchange heat through the heat exchange tube, and then enters the first gas-liquid separation space through the second space and the first channel.
Preferably, the first gas-liquid separation chamber is provided with a partition board in the first gas-liquid separation space, the partition board divides the first gas-liquid separation space into a separation chamber positioned below and a condensation chamber positioned above, the partition board is provided with an opening for communicating the separation chamber with the condensation chamber, the separation chamber is respectively communicated with the first channel and the second channel, and the vacuumizing module is communicated with the condensation chamber.
Preferably, the low-temperature negative pressure film evaporation assembly further comprises a compressor and a first condensing fan, a coil is arranged in the condensing chamber, a coil inlet and a coil outlet are formed in the side wall of the first gas-liquid separation chamber at two ends of the coil respectively, the compressor is communicated with the first heat exchange inlet and the coil outlet respectively, and the first condensing fan is communicated with the first heat exchange outlet and the coil inlet respectively; the compressor can raise the temperature and the pressure of the heat exchange medium and convey the heat exchange medium to the first heat exchange space through the first heat exchange inlet, and the first condensing fan can cool the heat exchange medium discharged from the first heat exchange outlet and convey the heat exchange medium into the coil through the coil inlet.
Preferably, the low-temperature negative pressure film evaporation assembly further comprises a second condensing fan, and the second condensing fan is communicated between the compressor and the first heat exchange inlet.
Preferably, the low-temperature negative pressure film evaporation assembly further comprises a pressure reducing device, wherein the pressure reducing device is communicated between the first condensing fan and the coil inlet and is used for reducing pressure of the heat exchange medium.
Preferably, the low-temperature negative pressure film evaporation assembly further comprises a temperature detection device, the temperature detection device is arranged at a communication position between the coil outlet and the compressor, the temperature detection device is electrically connected with the pressure reducing device, and the temperature detection device is used for detecting the temperature of the heat exchange medium discharged from the coil outlet and feeding back the detection result to the pressure reducing device.
Preferably, a guide cylinder positioned in the condensation chamber is arranged on the partition plate, and the guide cylinder is communicated with the opening; and a defogging net is arranged in the opening.
Preferably, the vacuum pumping module comprises a condensate water tank, a vacuum pump and a second gas-liquid separation chamber, wherein the condensate water tank is connected with the first gas-liquid separation chamber, a water storage space is arranged in the condensate water tank, the water storage space is communicated with the condensate chamber, a second gas-liquid separation space is arranged in the second gas-liquid separation chamber, an emptying port, an overflow port and a non-condensable gas outlet which are communicated with the second gas-liquid separation space are respectively arranged on the second gas-liquid separation chamber, the vacuum pump is communicated between the water storage space and the second gas-liquid separation space, and the vacuum pump can pump the gas flashed in the water storage space to the second gas-liquid separation chamber for gas-liquid separation.
Preferably, the low-temperature negative pressure membrane evaporation assembly further comprises a condensate water pump and a condensate water pipe, wherein the condensate water pipe is communicated between the water storage space and the condensate water pump, and the condensate water pump can pump distilled water formed by condensation in the water storage space.
Preferably, the low-temperature negative pressure membrane state evaporation assembly further comprises a raw liquid pump, a raw liquid pipe, a concentrate pump and a concentrate pipe, wherein the raw liquid pipe is communicated between the raw liquid pump and the raw liquid inlet, and the concentrate pipe is communicated between the concentrate pump and the concentrate outlet.
Compared with the prior art, the low-temperature negative pressure membrane state evaporation assembly has the advantages that the membrane state evaporation main body is arranged, the steam generator is utilized to provide the preheating steam for the first space in the membrane state evaporation main body, so that the raw liquid in the first space is preheated to the design temperature, then the first space is vacuumized through the first gas-liquid separation chamber and the second channel by the vacuumizing module, the preheated raw liquid is subjected to phase change and generates secondary steam under a certain vacuum degree, the steam generator can stop running, the secondary steam rises and can exchange heat through the heat exchange tube, the film evaporation is formed, and the secondary steam after heat exchange enters the first gas-liquid separation space through the second space and the first channel, so that the gas-liquid separation is performed. Therefore, the low-temperature negative pressure film evaporation assembly of the utility model utilizes the steam preheating and vacuumizing modes of the steam generator to ensure that a small amount of stock solution liquid carried in secondary steam rises and exchanges heat, thereby improving the heat exchange efficiency, ensuring that the stock solution is evaporated more fully, ensuring high evaporation efficiency and saving energy consumption.
Drawings
FIG. 1 is a block diagram of a low temperature negative pressure membrane state evaporation module of the present utility model.
FIG. 2 is a partial block diagram of the low temperature negative pressure membrane state evaporation module of the present utility model.
Detailed Description
In order to describe the technical content and constructional features of the present utility model in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 and 2, a low-temperature negative pressure membrane evaporation assembly 100 of the present utility model includes a membrane evaporation body 1, a steam generator 2, a first gas-liquid separation chamber 3 and a vacuum pumping module 6, wherein the inside of the membrane evaporation body 1 has a receiving space, a first orifice plate 11 and a second orifice plate 12 located above the first orifice plate 11 are disposed in the middle of the receiving space, the receiving space is divided into a first space 13 located below, a first heat exchange space 14 located in the middle and a second space 15 located above by the first orifice plate 11 and the second orifice plate 12, a raw liquid inlet 16 communicated with the first space 13 is disposed on a side wall of the membrane evaporation body 1, a first heat exchange inlet 17 and a first heat exchange outlet 18 communicated with the first heat exchange space 14 are further disposed on a side wall of the membrane evaporation body 1, a concentrated liquid outlet 19 communicated with the first heat exchange space 14 is disposed at the bottom of the membrane evaporation body 1, the first heat exchange inlet 17 is used for supplying heat exchange medium to enter the first heat exchange space 14, the first heat exchange outlet 18 is used for exchanging medium to leave the first heat exchange space 14, a plurality of heat exchange pipes 141 are disposed between the first heat exchange space 11 and the second orifice plate 12 and the first heat exchange space 13 are respectively communicated with two heat exchange pipes 141; the steam generator 2 is connected with the membrane evaporation body 1 and is communicated with the first space 13; the first gas-liquid separation chamber 3 is internally provided with a first gas-liquid separation space 31, and a first channel 4 for communicating the second space 15 with the first gas-liquid separation space 31 and a second channel 5 for communicating the first gas-liquid separation space 31 with the first space 13 are arranged between the membrane evaporation body 1 and the first gas-liquid separation chamber 3; the vacuum pumping module 6 is connected with the first gas-liquid separation chamber 3 and is communicated with the first gas-liquid separation space 31.
The steam generator 2 is used for providing preheated steam for the first space 13 so as to preheat the stock solution in the first space 13 to the design temperature, then the vacuumizing module 6 is used for vacuumizing the first space 13 through the first gas-liquid separation chamber 3 and the second channel 5, so that the stock solution is subjected to phase change and secondary steam is generated, the secondary steam can exchange heat through the heat exchange tube 141, then enters the first gas-liquid separation space 31 through the second space 15 and the first channel 4, gas-liquid separation is carried out, the separated gas rises, and the separated liquid flows back into the first space 13 of the film evaporation main body 1 through the second channel 5. Wherein the communication between the steam generator 2 and the first space 13 may be via a pipe.
Referring to fig. 2, in the present embodiment, a partition plate 32 is disposed in the first gas-liquid separation space 31 in the first gas-liquid separation chamber 3, the partition plate 32 divides the first gas-liquid separation space 31 into a separation chamber 311 located below and a condensation chamber 312 located above, an opening is disposed on the partition plate 32 for communicating the separation chamber 311 with the condensation chamber 312, the separation chamber 311 is respectively communicated with the first channel 4 and the second channel 5, and the vacuumizing module 6 is communicated with the condensation chamber 312. The secondary steam is first separated into gas and liquid through the second space 15 and the first channel 4 in the separating chamber 311, the separated gas rises into the condensing chamber 312 for condensation, and the separated liquid flows back into the first space 13 of the film evaporation body 1 through the second channel 5. However, the structure of the first gas-liquid separation chamber 3 is not limited to this, and for example, in other embodiments, the first gas-liquid separation chamber 3 may be provided with only the separation chamber 311 for gas-liquid separation.
Referring to fig. 1 and 2, in the present embodiment, the low-temperature negative pressure film evaporation assembly 100 of the present utility model further includes a compressor 71 and a first condensing fan 72, a coil 33 is disposed in the condensing chamber 312, two ends of the coil 33 form a coil inlet 331 and a coil outlet 332 on the sidewall of the first gas-liquid separation chamber 3, the compressor 71 is respectively communicated with the first heat exchange inlet 17 and the coil outlet 332, and the first condensing fan 72 is respectively communicated with the first heat exchange outlet 18 and the coil inlet 331; the compressor 71 may raise the temperature and pressure of the heat exchange medium and may be transferred to the first heat exchange space 14 through the first heat exchange inlet 17, and the first condensing fan 72 may cool the heat exchange medium discharged from the first heat exchange outlet 18 and may be transferred into the coil 33 through the coil inlet 331. The heat exchange medium may be an existing refrigerant, but is not limited thereto. The low-temperature gaseous refrigerant is subjected to temperature and pressure raising through the compressor 71 and then is changed into a high-temperature gaseous state, then enters the first heat exchange space 14 through the first heat exchange inlet 17, the high-temperature gaseous refrigerant exchanges heat with secondary steam (primary steam is carried with primary liquid) in the heat exchange tube 141 in the first heat exchange space 14, the heat exchanged refrigerant is condensed into a high-temperature liquid state, then is discharged from the first heat exchange outlet 18, the temperature of the refrigerant is reduced through the first condensing fan 72, the cooled low-temperature liquid refrigerant enters the coil 33 through the coil inlet 331 of the first gas-liquid separation chamber 3, heat exchange is carried out between the coil 33 and steam outside the coil 33, the heat exchanged refrigerant is changed into a low-temperature gaseous state, and the heat exchanged steam in the condensing chamber 312 is condensed into distilled water.
Referring to fig. 1, further, the low-temperature negative pressure film evaporation assembly 100 of the present utility model further includes a second condensing fan 73, and the second condensing fan 73 is connected between the compressor 71 and the first heat exchange inlet 17. The low-temperature gaseous refrigerant is changed into high-temperature gaseous after being heated and pressurized by the compressor 71, and in order to prevent the temperature from being too high, the second condensing fan 73 is arranged, after the low-temperature gaseous refrigerant is in high-temperature gaseous state, if the temperature is overheated, the second condensing fan 73 can cool the refrigerant, and the cooled refrigerant enters the first heat exchange space 14 through the heat exchange inlet.
Referring to fig. 1, further, the low-temperature negative pressure film evaporation assembly 100 of the present utility model further includes a pressure reducing device 74, the pressure reducing device 74 is connected between the first condensing fan 72 and the coil inlet 331, and the pressure reducing device 74 is used for reducing pressure of the heat exchange medium. After the first condensing fan 72 cools the heat exchange medium discharged from the first heat exchange outlet 18, the pressure reducing device 74 reduces the pressure of the heat exchange medium, so that the heat exchange medium is delivered into the coil 33 through the coil inlet 331. The pressure reducing device 74 may be an existing expansion valve, but is not limited thereto.
Referring to fig. 1, further, the low-temperature negative pressure film evaporation assembly 100 of the present utility model further includes a temperature detecting device 75, the temperature detecting device 75 is disposed at a communication position between the coil outlet 332 and the compressor 71, the temperature detecting device 75 is electrically connected to the pressure reducing device 74, and the temperature detecting device 75 is configured to detect a temperature of the heat exchange medium discharged from the coil outlet 332 and feed back a detection result to the pressure reducing device 74. The temperature of the heat exchange medium discharged from the coil outlet 332 is detected by the temperature detecting means 75, and the detection result is fed back to the pressure reducing means 74, whereby the operation of the pressure reducing means 74 is controlled by the degree of superheat of the heat exchange medium discharged from the coil outlet 332.
The compressor 71, the second condensing fan 73, the film evaporation body 1, the first condensing fan 72, the pressure reducing device 74, the first gas-liquid separation chamber 3, and the temperature detecting device 75 may be connected by existing pipes.
Referring to fig. 2, in the present embodiment, a baffle plate 32 is provided with a guide cylinder 34 located in a condensation chamber 312, and the guide cylinder 34 is communicated with the opening; a defogging net 35 is arranged in the opening. The secondary steam is first separated into gas and liquid through the second space 15 and the first channel 4 in the separating chamber 311, the separated gas rises, and then enters the condensing chamber 312 through the demisting net 35 and the inside of the guide cylinder 34 to be condensed, and the guide cylinder 34 plays a guide role for the flow of the secondary steam. Wherein, because be equipped with defogging net 35 in the trompil, defogging net 35 can purify the secondary steam that gets into draft tube 34, guarantees the purity of steam.
Referring to fig. 1, in the present embodiment, the vacuum pumping module 6 includes a condensation water tank 61, a vacuum pump 62 and a second gas-liquid separation chamber 63, the condensation water tank 61 is connected with the first gas-liquid separation chamber 3, a water storage space 611 is provided in the condensation water tank 61, the water storage space 611 is communicated with the condensation chamber 312, a second gas-liquid separation space 631 is provided in the second gas-liquid separation chamber 63, an evacuation port 632, an overflow port 633 and a non-condensable gas outlet 634 are respectively provided in the second gas-liquid separation chamber 63, the vacuum pump 62 is connected between the water storage space 611 and the second gas-liquid separation space 631, and the vacuum pump 62 can pump the gas flashed in the water storage space 611 to the second gas-liquid separation chamber 63 for gas-liquid separation. The vacuum pump 62 is turned on to vacuumize the first gas-liquid separation chamber 3 and the membrane evaporation body 1, so that the preheated stock solution in the first space 13 is subjected to phase change and secondary steam is generated. In addition, the vapor in the condensation chamber 312 of the first gas-liquid separation chamber 3 is condensed into distilled water after heat exchange with the heat exchange medium in the coil 33, then the distilled water can flow into the water storage space 611 of the condensation water tank 61, the gas flashed in the water storage space 611 can be sucked out by the vacuum pump 62, and then the gas enters the second gas-liquid separation chamber 63, and the non-condensable gas in the gas can carry a little saturated vapor and can enter the second gas-liquid separation chamber 63 to perform gas-liquid separation, after separation, the non-condensable gas is discharged through the non-condensable gas outlet 634, and the liquid can be stored in the second gas-liquid separation space 631 of the second gas-liquid separation chamber 63 and overflows through the overflow port 633 when the liquid level is high. However, the structure of the vacuum-pumping module 6 is not limited to this, and for example, in other embodiments, the vacuum-pumping module 6 may be provided with only the condensate water tank 61 and the vacuum pump 62. The communication among the membrane evaporation body 1, the condensate tank 61, the vacuum pump 62 and the second gas-liquid separation chamber 63 may be performed by using existing pipelines.
Referring to fig. 1, in the embodiment, the low-temperature negative pressure film evaporation assembly 100 of the present utility model further includes a condensate pump 81 and a condensate pipe 82, wherein the condensate pipe 82 is connected between the water storage space 611 and the condensate pump 81, and the condensate pump 81 can pump out distilled water formed by condensation in the water storage space 611.
Referring to fig. 1, in the embodiment, the low-temperature negative pressure membrane evaporation module 100 of the present utility model further includes a raw liquid pump 91, a raw liquid pipe 92, a concentrate pump 93 and a concentrate pipe 94, wherein the raw liquid pipe 92 is connected between the raw liquid pump 91 and the raw liquid inlet 16, and the concentrate pipe 94 is connected between the concentrate pump 93 and the concentrate outlet 19. The raw liquid can be fed into the first space 13 of the film evaporation body 1 through the raw liquid pump 91 and the raw liquid pipe 92, and the concentrated liquid in the first space 13 can be pumped out through the concentrated liquid pump 93 and the concentrated liquid pipe 94.
Referring to fig. 1 and 2, the specific working principle of the low-temperature negative pressure film evaporation assembly 100 of the present utility model is as follows:
stock solution: the stock solution enters the first space 13 of the film evaporation main body 1, the steam generator 2 provides steam to preheat the stock solution in the first space 13 to the design temperature, the vacuum pump 62 is started to vacuumize the system, the stock solution changes phase to generate secondary steam under a certain vacuum degree, and the steam generator 2 stops running. The secondary steam carries the stock solution (wastewater) and rises into the heat exchange tube 141, and the secondary steam exchanges heat with a high-temperature heat exchange medium (refrigerant) in the first heat exchange space 14 through the heat exchange tube 141 to form thin film evaporation.
Steam: after the secondary steam after heat exchange through the heat exchange tube 141 rises to the outlet of the heat exchange tube 141, a small amount of liquid is still carried, so that the secondary steam enters the separation chamber 311 of the first gas-liquid separation chamber 3 through the second space 15 and the first channel 4, gas-liquid separation is performed, the separated gas enters the condensation chamber 312 through the demisting net 35 and the guide cylinder 34, and the separated liquid flows back to the evaporation body through the second channel 5. In the condensing chamber 312 at the upper part of the first gas-liquid separation chamber 3, the separated gas exchanges heat with the low-temperature gaseous refrigerant in the coil 33, is condensed into distilled water after the heat exchange, and then flows to the condensing water tank 61. The flash evaporation gas in the condensed water tank 61 is sucked out by the vacuum pump 62, and the noncondensable gas needs to enter the second gas-liquid separation chamber 63 because the noncondensable gas carries a little saturated steam, and is separated again, after the separation, the noncondensable gas is directly discharged out of the system through the noncondensable gas outlet 634, and the liquid is stored in the second gas-liquid separation space 631 of the second gas-liquid separation chamber 63, and when the liquid level is high, the liquid can overflow through the overflow port 633.
Heat exchange medium-refrigerant: the low-temperature gaseous refrigerant is changed into a high-temperature gaseous refrigerant after being heated and pressurized by the compressor 71, and is provided with a second condensing fan 73 for preventing the temperature from being excessively high, and is cooled when it is overheated. The refrigerant enters the first heat exchanging space 14 of the evaporating body and exchanges heat with the secondary steam and the primary liquid in the heat exchanging pipe 141, then the refrigerant is condensed into a high-temperature liquid state, the temperature and the pressure of the refrigerant are reduced to a low-temperature liquid state through the first condensing fan 72 and the pressure reducing device 74, the low-temperature liquid refrigerant enters the coil 33 in the condensing chamber 312 of the first gas-liquid separation chamber 3, exchanges heat with the steam passing through the demisting net 35 and then becomes a low-temperature gas refrigerant, the temperature of the heat exchanging medium discharged from the coil outlet 332 is detected by the temperature detecting device 75, and the detection result is fed back to the pressure reducing device 74, so that the operation of the pressure reducing device 74 is controlled through the superheat degree of the refrigerant discharged from the coil outlet 332. Finally, the refrigerant returns to the compressor 71 for recycling.
In summary, the low-temperature negative pressure film evaporation assembly 100 of the utility model utilizes the steam preheating and vacuumizing modes of the steam generator 2 to make the secondary steam carry a small amount of stock solution liquid to rise and exchange heat, thereby improving the heat exchange efficiency, making the stock solution evaporation more sufficient, the evaporation efficiency high and saving energy consumption.
The foregoing disclosure is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.
Claims (10)
1. A low temperature negative pressure membrane state evaporation assembly, comprising:
the membrane evaporation device comprises a membrane evaporation body, wherein an accommodating space is formed in the membrane evaporation body, a first pore plate and a second pore plate which is positioned above the first pore plate are arranged in the middle of the accommodating space, the accommodating space is divided into a first space positioned below, a first heat exchange space positioned in the middle and a second space positioned above the first heat exchange space by the first pore plate and the second pore plate, a raw liquid inlet which is communicated with the first space is formed in the side wall of the membrane evaporation body, a first heat exchange inlet and a first heat exchange outlet which are communicated with the first heat exchange space are also formed in the side wall of the membrane evaporation body, a concentrated liquid outlet which is communicated with the first heat exchange space is formed in the bottom of the membrane evaporation body, a heat supply exchange medium enters the first heat exchange space, a plurality of heat exchange pipes which are positioned in the first heat exchange space are penetrated between the first pore plate and the second pore plate, and the two ends of the heat exchange pipes are respectively communicated with the first space and the second space;
the steam generator is connected with the film evaporation body and is communicated with the first space;
the membrane evaporation body is provided with a first channel for communicating the second space with the first gas-liquid separation space and a second channel for communicating the first gas-liquid separation space with the first space;
and the vacuumizing module is connected with the first gas-liquid separation chamber and is communicated with the first gas-liquid separation space.
2. The low-temperature negative pressure membrane evaporation assembly according to claim 1, wherein the first gas-liquid separation chamber is provided with a partition board in the first gas-liquid separation space, the partition board divides the first gas-liquid separation space into a separation chamber positioned below and a condensation chamber positioned above, the partition board is provided with an opening for communicating the separation chamber with the condensation chamber, the separation chamber is respectively communicated with the first channel and the second channel, and the vacuumizing module is communicated with the condensation chamber.
3. The low-temperature negative pressure membrane state evaporation assembly according to claim 2, further comprising a compressor and a first condensing fan, wherein a coil is arranged in the condensing chamber, two ends of the coil are respectively provided with a coil inlet and a coil outlet on the side wall of the first gas-liquid separation chamber, the compressor is respectively communicated with the first heat exchange inlet and the coil outlet, and the first condensing fan is respectively communicated with the first heat exchange outlet and the coil inlet; the compressor can raise the temperature and the pressure of the heat exchange medium and convey the heat exchange medium to the first heat exchange space through the first heat exchange inlet, and the first condensing fan can cool the heat exchange medium discharged from the first heat exchange outlet and convey the heat exchange medium into the coil through the coil inlet.
4. The low temperature negative pressure membrane state evaporation assembly according to claim 3, further comprising a second condensing fan, said second condensing fan being in communication between said compressor and said first heat exchange inlet.
5. The low temperature negative pressure membrane state evaporation module according to claim 3, further comprising a pressure reducing device, said pressure reducing device being in communication between said first condensing fan and said coil inlet, said pressure reducing device being configured to reduce pressure of said heat exchange medium.
6. The low temperature negative pressure membrane state evaporation module according to claim 5, further comprising a temperature detection device disposed at a communication position between said coil outlet and said compressor, said temperature detection device being electrically connected to said pressure reducing device, said temperature detection device being configured to detect a temperature of said heat exchange medium discharged from said coil outlet and feed back a detection result to said pressure reducing device.
7. The low-temperature negative pressure membrane state evaporation assembly according to claim 2, wherein a guide cylinder positioned in the condensation chamber is arranged on the partition plate, and the guide cylinder is communicated with the opening; and a defogging net is arranged in the opening.
8. The low-temperature negative pressure membrane evaporation assembly according to claim 2, wherein the vacuum pumping module comprises a condensate water tank, a vacuum pump and a second gas-liquid separation chamber, the condensate water tank is connected with the first gas-liquid separation chamber, a water storage space is formed inside the condensate water tank and is communicated with the condensate chamber, a second gas-liquid separation space is formed inside the second gas-liquid separation chamber, an evacuation port, an overflow port and a non-condensable gas outlet which are communicated with the second gas-liquid separation space are respectively formed in the second gas-liquid separation chamber, the vacuum pump is communicated between the water storage space and the second gas-liquid separation space, and the vacuum pump can pump the gas flashed in the water storage space to the second gas-liquid separation chamber for gas-liquid separation.
9. The low-temperature negative pressure membrane evaporation assembly according to claim 8, further comprising a condensate pump and a condensate pipe, wherein the condensate pipe is communicated between the water storage space and the condensate pump, and the condensate pump can pump distilled water formed by condensation in the water storage space.
10. The low temperature negative pressure membrane state evaporation assembly according to claim 8, further comprising a raw liquid pump, a raw liquid pipe, a concentrate pump, and a concentrate pipe, wherein the raw liquid pipe is connected between the raw liquid pump and the raw liquid inlet, and the concentrate pipe is connected between the concentrate pump and the concentrate outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321654950.7U CN220201506U (en) | 2023-06-27 | 2023-06-27 | Low-temperature negative pressure membrane evaporation assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321654950.7U CN220201506U (en) | 2023-06-27 | 2023-06-27 | Low-temperature negative pressure membrane evaporation assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220201506U true CN220201506U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321654950.7U Active CN220201506U (en) | 2023-06-27 | 2023-06-27 | Low-temperature negative pressure membrane evaporation assembly |
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| Country | Link |
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| CN (1) | CN220201506U (en) |
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2023
- 2023-06-27 CN CN202321654950.7U patent/CN220201506U/en active Active
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