CN210729178U - A double-sided cooling multi-channel type membrane distillation device - Google Patents

Abstract

The utility model provides a double-sided cooling multi-channel type membrane distillation device, which comprises a shell, and two layers of horizontally arranged cold walls are arranged in the shell to separate the inner cavity of the shell into an upper cold flow from top to bottom. The upper cold flow area, the heat flow area and the lower cold flow area are provided with multiple separators side by side along the direction of fluid flow; in the heat flow area, two layers of porous hydrophobic membranes are arranged horizontally to separate the heat flow area Air gap channels are separated from the upper and lower ends of the air gap channel, a plurality of fins are arranged in the air gap channel, and cooling water inlet pipes and cooling water outlet pipes are arranged on the shells on opposite sides of the upper cold flow area and the lower cold flow area. . By arranging fins in the air gap channel, the utility model can strengthen the effect of water vapor condensation, and can play the role of supporting the porous hydrophobic membrane, reduce the curvature of the porous hydrophobic membrane, and reduce the flux loss; The flow zone, hot flow zone and lower cold flow zone are all divided into multiple parallel flow channels and can increase the flux.

Description

A double-sided cooling multi-channel type membrane distillation device

technical field

The utility model belongs to the technical field of distillation devices, in particular to a double-sided cooling multi-channel type membrane distillation device.

Background technique

my country is a country dominated by thermal power generation. Coal-fired power generation is still the main method of power generation in our country, and the accompanying pollution has brought very serious environmental problems. Therefore, we must try to reduce the pollution. The wastewater produced by the power plant has been desulfurized to remove sulfur, but its chemical composition is still very complex and difficult to handle. Common methods include multi-stage flash evaporation, membrane separation, etc. For methods such as multi-stage flash evaporation, there are disadvantages such as high energy consumption and expensive equipment. The driving force of membrane separation methods is generally concentration difference, pressure difference, etc. In order to maintain a high flux, it also needs to consume a lot of energy.

Utility model content

The technical problem to be solved by the present invention is to provide a double-sided cooling multi-channel type membrane distillation device in view of the above-mentioned deficiencies in the prior art. The device can strengthen the condensation of water vapor by arranging fins in the air-gap channel. It can also play the role of supporting the porous hydrophobic membrane, reduce the curvature of the porous hydrophobic membrane, and reduce the flux loss; the separator divides the upper cold flow area, the hot flow area and the lower cold flow area into multiple parallel flow channels , and can improve the flux, improve the state of poor liquid flow caused by the large plane, promote the liquid flow state, facilitate the mass transfer process, improve the efficiency of membrane distillation, and pass the upper cold flow area, hot flow area and lower cooling The upper and lower forms of the flow zone are arranged to promote the condensation of water vapor.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present invention is: a double-sided cooling multi-channel type membrane distillation device, comprising a shell, and two layers of horizontally arranged cold walls are arranged in the shell to separate the shells. The inner cavity is sequentially divided into an upper cold flow area, a hot flow area and a lower cold flow area from top to bottom, and a plurality of partitions are arranged side by side in the direction of fluid flow in the upper cold flow area, the hot flow area and the lower cold flow area; Two layers of porous hydrophobic membranes are arranged horizontally in the heat flow area to separate the upper and lower ends of the heat flow area into air gap channels, and a plurality of fins are arranged in the air gap channels. The upper cold flow area and the lower cold flow area The shells on the opposite sides of the zone are provided with cooling water inlet pipes and cooling water outlet pipes, and the cooling water inlet pipes of the upper cold flow zone and the cooling water outlet pipes of the lower cold flow zone are arranged in the shells. On the same side of the body, the cooling water inlet pipe is provided with a plurality of water inlet sub-pipes, the cooling water outlet pipe is provided with a plurality of water outlet sub-pipes, the water inlet sub-pipes and the water outlet sub-pipes are located one by one. Relatively arranged, the shells on the opposite sides of the heat flow area are provided with a hot material liquid feeding pipeline and a hot material liquid discharging pipe, and a plurality of feeding sub-pipes are arranged on the hot material liquid feeding pipe, so A plurality of discharging sub-tubes are arranged on the hot material liquid discharging pipeline, and the positions of the feeding sub-tubes and the discharging sub-tubes are arranged one by one opposite to each other.

Preferably, the water inlet sub-tubes of the upper cold flow zone, the feed sub-tubes of the hot flow zone and the water outlet sub-tubes of the lower cold flow zone are all the same in number, and are distributed in a rectangular matrix in the same part of the shell. on the outer side wall; the partition plate is arranged between two adjacent water inlet sub-tubes and between two adjacent feeding sub-tubes.

Preferably, the outer wall of the casing is provided with a cooling water collecting pipe, and the cooling water collecting pipe passes through the casing and communicates with the air gap channel.

Preferably, the porous hydrophobic membrane is a porous polytetrafluoroethylene hydrophobic membrane or a porous polyvinylidene fluoride hydrophobic membrane.

Preferably, the pore size of the porous hydrophobic membrane is 200 nm˜400 nm.

Compared with the prior art, the utility model has the following advantages:

1. The utility model can strengthen the effect of water vapor condensation by setting the fins in the air gap channel, and can play the role of supporting the porous hydrophobic membrane, reduce the curvature of the porous hydrophobic membrane, and reduce the flux loss.

2. The utility model adopts the partition plate to divide the upper cold flow area, the hot flow area and the lower cold flow area into a plurality of parallel flow channels, and can improve the flux and improve the state of poor liquid flow caused by the larger plane. , promote the liquid flow state, facilitate the mass transfer process, improve the efficiency of membrane distillation, and promote the condensation of water vapor through the upper and lower cold flow area, hot flow area and lower cold flow area.

3. The directions of the condensed water entering the upper cold flow area and the lower cold flow area of the present invention are opposite, which can improve the effect of condensing water vapor.

The present utility model will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic cross-sectional view of the present utility model in the direction of a in FIG. 1 .

FIG. 3 is a schematic cross-sectional view of the present invention in the direction b in FIG. 1 .

Description of reference numbers:

1—Shell; 2—Cooling water inlet pipe; 3—Hot liquid feed pipe;

4—cooling water outlet pipe; 5—hot material liquid outlet pipe; 6—upper cold flow area;

7—Lower cold flow area; 8—Heat flow area; 9—Clapboard;

10—cold wall; 11—porous hydrophobic membrane; 12—fins;

13—air gap channel; 14—partition plate; 15—cooling water collection pipe.

Detailed ways

As shown in Figures 1-3, the present invention includes a casing 1, and two layers of horizontally arranged cold walls 10 are arranged in the casing 1 to divide the inner cavity of the casing 1 into an upper cold flow area from top to bottom. 6. Heat flow area 8 and lower cold flow area 7, the heat flow area 8 is between the upper cold flow area 6 and the lower cold flow area 7, which can better utilize the heat of the hot liquid in the heat flow area 8 and reduce heat loss ; In the upper cold flow area 6, the hot flow area 8 and the lower cold flow area 7, a plurality of partitions 9 are arranged side by side along the direction of fluid flow, and the partitions 9 separate the upper cold flow area 6, the heat flow area 8 and the lower cold flow area 7 are divided into multiple parallel flow channels, which can increase the flux, improve the liquid flow state, facilitate the mass transfer process, improve the efficiency of membrane distillation, and pass the cold flow channel-hot flow channel-cold flow channel. The upper and lower sides of the heat flow area are arranged in the form of upper and lower sides to promote the condensation of water vapor; two layers of porous hydrophobic membranes 11 are horizontally arranged in the heat flow area 8 to separate the upper and lower ends of the heat flow area 8 into an air gap channel 13. The air gap channel 13 A plurality of fins 12 are arranged inside, and the fins 12 are arranged in the air gap channel 13, which can strengthen the effect of water vapor condensation, and can play the role of supporting the porous hydrophobic membrane 11, reducing the curvature of the porous hydrophobic membrane 11. , reducing flux loss; the housings 1 on opposite sides of the upper cold flow area 6 and the lower cold flow area 7 are provided with cooling water inlet pipes 2 and cooling water outlet pipes 4. The upper cold flow area The cooling water inlet pipe 2 of 6 and the cooling water outlet pipe 4 of the lower cold flow area 7 are arranged on the same side of the casing 1, and the cooling water inlet pipe 2 is provided with a plurality of water inlet sub-pipes, so The cooling water outlet pipe 4 is provided with a plurality of water outlet sub-tubes, the water inlet sub-tubes and the water outlet sub-tubes are arranged one by one opposite each other, and the shells 1 on opposite sides of the heat flow area 8 are provided with hot material liquid. The feed pipe 3 and the hot material liquid discharge pipe 5, the hot material liquid feeding pipe 3 is provided with a plurality of feeding sub-pipes, and the hot material liquid discharging pipe 5 is provided with a plurality of discharging sub pipes, The feeding sub-tubes and the discharging sub-tubes are arranged one by one opposite to each other; the multiple water inlet and outlet sub-tubes, the multiple feeding sub-tubes and the discharging sub-tubes can accelerate the flow of the liquid and improve the flux.

In the present invention, the water inlet sub-tubes of the upper cold flow zone 6, the feed sub-tubes of the hot flow zone 8, and the water outlet sub-tubes of the lower cold flow zone 7 are all the same in number, and are distributed in the shape of a rectangular matrix. The partition plate 9 is arranged between two adjacent water inlet sub-tubes and between two adjacent feeding sub-tubes.

In the present invention, the outer wall of the casing 1 is provided with a cooling water collecting pipe 15 , and the cooling water collecting pipe 15 passes through the casing 1 and communicates with the air gap channel 13 .

In the present invention, the porous hydrophobic membrane 11 is a porous polytetrafluoroethylene hydrophobic membrane or a porous polyvinylidene fluoride hydrophobic membrane.

In the present invention, the pore size of the porous hydrophobic membrane 11 is 200 nm to 400 nm.

The working principle of the present utility model:

When starting to operate, the hot material liquid is fed into the hot material liquid feed pipe 3 of the present utility model, and cooling water is fed into the two cooling water inlet pipes 2 at the same time. When the hot material liquid flows into the hot material through the hot flow zone 8 When the cooling water flows into the corresponding cooling water outlet pipe 4 through the upper cold flow area 6 and the lower cold flow area 7 in opposite flow directions, the utility model enters a stable operation state, and the hot material liquid in the hot flow area 8 The evaporated water vapor enters the air gap channel 13 through the porous hydrophobic membrane 11, condenses on the fins 12 and the cold wall 10, and flows into the cooling water collection pipe 15 to discharge the condensed water, while other substances in the hot liquid cannot pass through the porous hydrophobicity. The membrane 11 is discharged from the hot material liquid discharge pipeline 5, and the above operations are recirculated until the hot material liquid is concentrated on the porous hydrophobic membrane 11 to form crystals.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any way. Any simple modifications, changes and equivalent changes made to the above embodiments according to the technical essence of the utility model still fall within the protection scope of the technical solution of the present utility model.

Claims (5)

1. A double-sided cooling multi-channel membrane distillation device is characterized by comprising a shell (1), wherein two layers of horizontally arranged cold walls (10) are arranged in the shell (1) to sequentially divide an inner cavity of the shell (1) into an upper cold flow area (6), a hot flow area (8) and a lower cold flow area (7) from top to bottom, and a plurality of partition plates (9) are arranged in the upper cold flow area (6), the hot flow area (8) and the lower cold flow area (7) side by side in the flowing direction of a fluid; the hot flow area (8) is horizontally provided with two layers of porous hydrophobic membranes (11) which divide the upper end and the lower end of the hot flow area (8) into air gap channels (13), a plurality of fins (12) are arranged in the air gap channels (13), the shells (1) on the two opposite sides of the upper cold flow area (6) and the lower cold flow area (7) are respectively provided with a cooling water inlet pipeline (2) and a cooling water outlet pipeline (4), the cooling water inlet pipeline (2) of the upper cold flow area (6) and the cooling water outlet pipeline (4) of the lower cold flow area (7) are arranged on the same side of the shell (1), the cooling water inlet pipeline (2) is provided with a plurality of water inlet sub-pipes, the cooling water outlet pipeline (4) is provided with a plurality of water outlet sub-pipes, the water inlet sub-pipes and the water outlet sub-pipes are arranged in a one-to-one manner, and the shells (1) on the two opposite sides of the hot flow area (8) are provided with a hot material liquid feed pipeline (3) and a hot material liquid discharge pipeline ) The feeding device is characterized in that a plurality of feeding sub-pipes are arranged on the hot liquid feeding pipeline (3), a plurality of discharging sub-pipes are arranged on the hot liquid discharging pipeline (5), and the feeding sub-pipes and the discharging sub-pipes are arranged in a one-to-one opposite mode.

2. A double-sided cooled multi-channel membrane distillation unit according to claim 1, wherein the number of water inlet sub-pipes of the upper cold flow zone (6), the number of water inlet sub-pipes of the hot flow zone (8) and the number of water outlet sub-pipes of the lower cold flow zone (7) are the same, and are distributed on the same outer side wall of the shell (1) in a rectangular matrix shape; the partition plates (9) are distributed in an upper cold flow area (6) and a lower cold flow area (7) between two adjacent water inlet sub-pipes and two adjacent water outlet sub-pipes, and distributed in a hot flow area (8) between two adjacent water inlet sub-pipes and two adjacent water outlet sub-pipes.

3. A double-sided cooled multi-flow channel membrane distillation device according to claim 1, wherein the outer wall of the housing (1) is provided with a cooling water collection pipe (15), and the cooling water collection pipe (15) passes through the housing (1) and communicates with the air gap channel (13).

4. A double-sided cooled multi-channel membrane distillation device according to claim 1, wherein the porous hydrophobic membrane (11) is a porous polytetrafluoroethylene hydrophobic membrane or a porous polyvinylidene fluoride hydrophobic membrane.

5. A double-sided cooled multi-channel membrane distillation device according to claim 1 or 4, wherein the pore size of the porous hydrophobic membrane (11) is 200nm to 400 nm.

Images