Low-resistance falling film assembly

Abstract

The utility model discloses a low-resistance falling film assembly which comprises a shell and a cavity arranged in the shell, and the shell is provided with a feed gas inlet, a tail gas outlet, a permeate gas outlet I and a permeate gas outlet II; a separation membrane assembly is arranged in the cavity and comprises a flat plate gas separation membrane, a flow guide net and a sealing layer; a flow guide net and sealing layers are arranged between the flat plate gas separation membranes, and the sealing layers are arranged on the two sides of the flow guide net. According to the low-resistance membrane module provided by the invention, through the design of the separation membrane module and the arrangement of the supporting piece on the outer surface of the separation membrane module, the pressure of the separated material flow entering the membrane module is reduced through the synergistic effect of the separation membrane module and the supporting piece, so that the flow resistance of the fluid is further reduced, and the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a low-resistance falling film assembly and belongs to the technical field of membrane separation. BACKGROUND

[0002] In chemical production, membrane separation technology is an important technology for realizing separation of mixed gas. A membrane assembly is a core component for realizing membrane separation. Hollow fiber membrane assemblies, flat plate membrane assemblies, and roll-type membrane assemblies are widely applied in the fields of gas separation, liquid filtration, and water treatment, but still have some technical problems in actual application.

[0003] Although current membrane assemblies have been pursuing the design goal of low resistance drop, in actual production operation, the existing membrane assemblies still cannot meet the separation requirements of large gas flux due to unreasonable structure design, improper operation conditions and the like, resulting in increased resistance drop and energy consumption, thereby reducing the efficiency of the system. Therefore, the application provides a low-resistance drop membrane assembly which can be applied to large gas flux carbon capture to solve the problems of high resistance, high energy consumption and inability to meet the separation requirements of large gas flux of the existing membrane assemblies. SUMMARY

[0004] Based on the problems of high resistance, high energy consumption and inability to meet the separation requirements of large gas flux of the existing membrane assemblies, the application provides a low-resistance drop membrane assembly which reduces the flow resistance of fluid and reduces energy consumption by improving the flow channel structure of the membrane assembly.

[0005] According to one aspect of the application, a low-resistance drop membrane assembly is provided, which comprises a shell and a cavity provided in the shell, the shell is provided with a raw gas inlet, a tail gas outlet, a permeate gas outlet I and a permeate gas outlet II;

[0006] The cavity is provided with a separation membrane assembly, the separation membrane assembly comprises a flat plate gas separation membrane, a flow guide net and a sealing layer;

[0007] The flat plate gas separation membranes are provided with a flow guide net and a sealing layer therebetween, and the flow guide net is provided with a sealing layer on both sides thereof;

[0008] The flow guide net comprises a raw material side flow guide net and a permeate side flow guide net, and the raw material side flow guide net and the permeate side flow guide net are arranged in alternating directions.

[0009] In the application, the guide net is a silk screen. The two adjacent guide nets, the raw material side guide net and the permeation side guide net are alternately arranged to support. After the two sides of the alternately arranged guide nets are sealed by the sealing layer, a gas channel is formed. When the raw material gas enters the raw material side guide net, it is separated by the flat plate gas separation membrane on both sides of the raw material side guide net and then enters the adjacent permeation side guide net. Since the arrangement direction of the permeation side guide net and the raw material side guide net is alternately sealed by the sealing layer, the gas channel formed by the permeation side guide net and the raw material side guide net is crossed. The permeation gas separated by the flat plate gas separation membrane flows out through the channel of the permeation side guide net. Therefore, after the raw material gas and the permeation gas are alternately arranged by the raw material side guide net and the permeation side guide net, the gas is separated and shunted to form two different directions, and the separation is crossed to reduce the pressure, reduce the resistance and save the energy consumption. In addition, the guide net can also be made of non-woven fabric, polymer porous membrane, ceramic porous material, bamboo fiber and the like.

[0010] In the application, the size of the raw material side guide net in the low-resistance falling film assembly can be selected according to the size of the raw material gas. When the raw material gas is larger, the size of the raw material side guide net is larger, which can ensure that the channel for gas flow is large enough to realize the selection of the raw material side guide net according to different raw material gas.

[0011] In the application, the size of the permeation side guide net in the low-resistance falling film assembly can be selected according to the size of the permeation gas. When the permeation gas is larger, the size of the permeation side guide net is larger. In addition, the permeation side guide net has two outlets, so that the path of the permeation gas is short-circuited by half, and the gas amount on one side is half of one interface, which is beneficial to the reduction of the permeation side pressure, improves the effective partial pressure of the membrane separation process, and improves the separation effect of the membrane.

[0012] Optionally, the length of the guide net is less than the length of the flat plate gas separation membrane.

[0013] Optionally, the sum of the lengths of the guide net and the sealing layer is consistent with the length of the flat plate gas separation membrane. In the application, the two sides of the guide net are provided with the sealing layer, and the sealing layer is used to fill the length difference between the guide net and the separation layer, so as to enhance the sealing performance of the separation membrane assembly and prevent gas leakage. On the other hand, the length of the guide net is set to be less than the length of the flat plate gas separation membrane, and then the sealing layer is arranged on both sides of the guide net. The gas channel is formed in the guide net after being sealed by the sealing layer, which can prevent the short circuit of the gas flow into the permeation side, avoid the random flow of the gas, reduce the separation efficiency, increase the separation pressure and increase the energy consumption.

[0014] Optionally, the low-resistance falling film assembly further comprises a seal; the seal is arranged at four corners of the separation membrane assembly. In the present application, the seal is arranged at the four corners of the separation membrane assembly, and is arranged between the shell and the separation membrane assembly, mainly for enhancing the sealing performance of the assembly and improving the structural stability; in addition, the seal is installed at the four corners of the separation membrane assembly, which can ensure that the assembly is uniformly stressed during installation and use, and avoid leakage or damage caused by stress concentration; effectively prevent the problem of gas leakage from the corners of the assembly, thereby further ensuring the separation efficiency of the entire low-resistance falling film assembly.

[0015] Optionally, the low-resistance falling film assembly further comprises a plurality of support members; the support members are arranged between the shell and the separation membrane assembly, and are uniformly distributed on the outer surface of the separation membrane assembly. In the present application, the support members are uniformly distributed on the outer surface of the separation membrane assembly, and are kept a certain distance from the inner wall of the shell, to ensure that the flow channel between the membrane assembly and the shell is unobstructed; wherein the number and distribution of the support members are optimized according to the size and operating conditions of the membrane assembly. The support members are made of high-strength, corrosion-resistant materials such as stainless steel, engineering plastics or composite materials, and are designed as strip-shaped, grid-shaped or point-shaped structures, and the surface is treated to be smooth, which can provide sufficient support without significantly increasing the fluid flow resistance. In addition, the support members are arranged in a modular manner and are easy to replace, which reduces the maintenance cost of the low-resistance falling film assembly. In summary, in the present application, the support members arranged between the shell and the separation membrane assembly effectively prevent the membrane assembly from deforming or vibrating during operation, and improve the overall structural strength.

[0016] The beneficial effects that can be produced by the present application include:

[0017] The low resistance falling film component provided by the application reduces the pressure of the separated flow into the membrane component through the design of the separation membrane assembly and the support provided on the outer surface of the separation membrane assembly, thereby further reducing the flow resistance of the fluid and reducing the energy consumption. The guide flow net of the adjacent two layers, the raw material side guide flow net and the permeation side guide flow net are alternately arranged to support. After the two sides of the alternately arranged guide flow net are sealed by the sealing layer, a gas channel is formed. When the raw material gas enters from the raw material side guide flow net, it is separated by the flat plate gas separation membrane on both sides of the raw material side guide flow net and then enters the adjacent permeation side guide flow net. Since the arrangement direction of the permeation side guide flow net and the raw material side guide flow net is alternately sealed by the sealing layer, the gas channel formed by the permeation side guide flow net and the raw material side guide flow net is crossed, and the permeated gas separated by the flat plate gas separation membrane flows out through the channel of the permeation side guide flow net. Therefore, after the raw material gas and the permeated gas are alternately arranged by the raw material side guide flow net and the permeation side guide flow net, the gas is separated by being branched into two different directions and is crossed to be separated, thereby reducing the pressure, reducing the resistance and saving the energy consumption. In addition, the support not only improves the structural stability of the low resistance falling film component and the uniformity of the fluid distribution, but also further reduces the operating resistance and reduces the energy consumption.

[0018] The low resistance falling film component provided by the application can effectively reduce the pressure of the raw material side and the permeation side by selecting the size of the raw material side guide flow net and the permeation side guide flow net according to the size of the raw material gas and the permeation gas, thereby improving the membrane separation effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a shell of the low resistance falling film component of the application;

[0020] Figure 2 It is a cross-sectional view of the low resistance falling film component of the application;

[0021] Figure 3 It is an enlarged view of the separation membrane assembly of the low resistance falling film component of the application;

[0022] Figure 4 It is a structural view of the low resistance falling film component of the application.

[0023] In the drawings:

[0024] 1, raw material gas inlet; 2, tail gas outlet; 3, permeated gas outlet I; 4, permeated gas outlet II; 5, separation membrane assembly; 51, flat plate gas separation membrane; 52, guide flow net; 53, sealing layer; 54, raw material gas inlet direction; 55, permeated gas outlet direction; 6, support; 7, sealing member. DETAILED DESCRIPTION

[0025] The application will be described in detail below with reference to the embodiments, but the application is not limited to these embodiments. Example

[0026] like Figures 1-4 As shown, the low-resistance falling film assembly includes a housing and a cavity disposed within the housing (e.g., Figure 1 (As shown) The shell is provided with a raw gas inlet 1, a tail gas outlet 2, a permeate outlet I 3, and a permeate outlet II 4; the cavity is provided with a separation membrane assembly (such as... Figure 3 As shown, the separation membrane assembly includes a flat gas separation membrane 51, a flow guiding net 52, and a sealing layer 53; the flow guiding net 52 and the sealing layer 53 are provided between the flat gas separation membranes 51, and the sealing layer 53 is provided on both sides of the flow guiding net 52; the flow guiding net 52 includes a feed side flow guiding net and a permeation side flow guiding net, and the feed side flow guiding net and the permeation side flow guiding net are arranged in alternating directions.

[0027] like Figure 3 As shown, in this embodiment, the guide net uses wire mesh as the support layer. The alternating arrangement of the raw material side guide net and the permeation side guide net on adjacent layers not only provides support, but also forms gas channels after being sealed by the sealing layer on both sides. When the raw material gas enters from the raw material side guide net through the raw material gas inlet direction 54, it is separated by the flat gas separation membranes on both sides of the raw material side guide net and enters the adjacent permeation side guide net. Because the permeation side guide net and the raw material side guide net are arranged alternately and sealed by the sealing layer, the gas channels formed intersect with the gas channels formed in the raw material side guide net. The permeate gas separated by the flat gas separation membrane flows out through the permeate gas outlet direction 55 of the permeation side guide net. Therefore, after the raw material gas and the permeate gas are separated by the alternating arrangement of the raw material side guide net and the permeation side guide net, the gas flows in two different directions, which cross and separate, thereby reducing pressure, reducing resistance, and saving energy. In this embodiment, the sealing layer is uniformly coated with a high-performance adhesive on the sealing area, ensuring a consistent thickness of the sealing layer during coating to avoid local leakage.

[0028] like Figure 3 As shown, the length of the guide net 52 is less than the length of the flat gas separation membrane 51. The sum of the lengths of the guide net 52 and the sealing layer 53 is the same as the length of the flat gas separation membrane 51. In this embodiment, sealing layers are provided on both sides of the guide net to fill the length difference between the guide net and the separation layer, thereby enhancing the sealing performance of the separation membrane assembly and preventing gas leakage. On the other hand, by setting the length of the guide net to be less than the length of the flat gas separation membrane, and then providing sealing layers on both sides of the guide net, a gas channel is formed inside the guide net after being sealed by the sealing layers. This can prevent the gas flow from short-circuiting into the permeate side, avoiding the gas from wandering around, reducing its separation efficiency, increasing the separation pressure, and increasing energy consumption.

[0029] As Figure 4 shown, the low resistance falling film assembly further comprises a seal 7; the seal 7 is arranged at four corners of the separation membrane assembly. In this embodiment, the seal is arranged at the four corners of the separation membrane assembly, and the seal is arranged between the shell and the separation membrane assembly, mainly for enhancing the sealing performance of the assembly and improving the structural stability; in addition, the installation of the seal at the four corners of the separation membrane assembly can ensure that the assembly is uniformly stressed during installation and use, avoiding leakage or damage caused by stress concentration; effectively preventing the problem of gas leakage from the corners of the assembly, thereby further ensuring the separation efficiency of the entire low resistance falling film assembly.

[0030] As Figure 4 shown, the low resistance falling film assembly further comprises a plurality of support members 6; the support members 6 are arranged between the shell and the separation membrane assembly and are uniformly distributed on the outer surface of the separation membrane assembly. In this embodiment, a high-strength, grid-shaped composite material is used as the support member, which can provide sufficient support without significantly increasing the fluid flow resistance; the surface of the support member is treated to be smooth, which can reduce the frictional resistance of fluid flow to adapt to the actual needs of different occasions. In this embodiment, the support members are uniformly distributed on the outer surface of the separation membrane assembly and maintain a certain distance from the inner wall of the shell, ensuring that the flow channel between the membrane assembly and the shell is unobstructed. The support member can effectively prevent the membrane assembly from deforming or vibrating during operation, improving the overall structural strength; uniform distribution of the support member can ensure uniform fluid flow on the surface of the assembly, reducing local resistance drop.

[0031] The low resistance falling film assembly provided by the utility model, through the design of the separation membrane assembly and the arrangement of the support member on the outer surface of the separation membrane assembly, the two cooperate to reduce the pressure of the separated flow entering the membrane assembly, thereby further reducing the flow resistance of the fluid and reducing energy consumption. Among them, the adjacent two layers of guide nets, the raw material side guide net and the permeation side guide net are alternately arranged, which not only can play a supporting role, but also can form a gas channel after the two sides of the alternately arranged guide nets are sealed by the sealing layer. When the raw material gas enters from the raw material side guide net, it is separated by the flat plate gas separation membrane on both sides of the raw material side guide net and then enters the adjacent permeation side guide net. Since the permeation side guide net and the raw material side guide net are alternately arranged and sealed by the sealing layer, the gas channel formed by the permeation side guide net and the raw material side guide net is crossed with the gas channel formed by the raw material side guide net. The permeated gas separated by the flat plate gas separation membrane flows out through the channel of the permeation side guide net. Therefore, after the raw material gas and the permeated gas are alternately arranged by the raw material side guide net and the permeation side guide net, the gas is separated and divided into two different directions, and the separation is crossed, thereby reducing the pressure, reducing the resistance and saving the energy consumption. In addition, the support member not only improves the structural stability of the low resistance falling film assembly and the uniformity of the fluid distribution, but also further reduces the operating resistance and saves the energy consumption.

[0032] The low-resistance falling film component provided by the utility model, in the normal operation process, the raw material gas enters the separation film component from the raw material side flow guide net, is separated by the flat plate gas separation film 51 in the separation film component, enters the adjacent permeation side flow guide net, because the adjacent raw material side flow guide net and the permeation side flow guide net are alternately arranged, the gas is branched when separating to form two different directions, is separated cross, thereby reducing the pressure, reducing the resistance, the tail gas after separating is directly discharged from the tail gas outlet of the raw material side flow guide net opposite to the raw material gas inlet, the permeation gas is discharged from the permeation gas outlet I and the permeation gas outlet II on both sides of the permeation side flow guide net. In addition, the raw material gas is evenly distributed in the cavity of the low-resistance falling film component by the support 6, further reducing the operating resistance and reducing the energy consumption.

[0033] The low-resistance falling film component provided by the utility model, by setting according to the size of the raw material gas and the permeation gas, the size of the raw material side flow guide net and the permeation side flow guide net is selected, the pressure of the raw material side and the permeation side can be effectively reduced, thereby improving the effect of membrane separation.

[0034] The above is only a few embodiments of the application, and does not limit the application in any form, although the above is disclosed in the preferred embodiment, however, it is not used to limit the application, any skilled person in the art, without departing from the scope of the technical scheme of the application, using the above disclosed technical content makes some changes or modifications are equivalent to equivalent implementation cases, all belong to the scope of the technical scheme.

Claims

1. A low resistance falling film assembly characterized by, The low-resistance falling film assembly comprises a shell and a cavity provided in the shell, the shell is provided with a raw material gas inlet (1), a tail gas outlet (2), a permeated gas outlet I (3) and a permeated gas outlet II (4); The cavity is provided with a separation membrane assembly, the separation membrane assembly comprises a flat plate gas separation membrane (51), a flow guide net (52) and a sealing layer (53); The flow guide net (52) and the sealing layer (53) are arranged between the flat plate gas separation membranes (51), and the two sides of the flow guide net (52) are provided with the sealing layer (53); The flow guide net (52) comprises a raw material side flow guide net and a permeated side flow guide net, and the raw material side flow guide net and the permeated side flow guide net are arranged in an alternating direction.

2. The low resistance falling film assembly of claim 1, wherein, The length of the flow guide net (52) is less than the length of the flat plate gas separation membrane (51).

3. The low resistance falling film assembly of claim 1, wherein, The sum of the length of the flow guide net (52) and the length of the sealing layer (53) is consistent with the length of the flat plate gas separation membrane (51).

4. The low resistance falling film assembly of claim 1, wherein, The low-resistance falling film assembly further comprises a sealing element (7); The sealing element (7) is arranged at four corners of the separation membrane assembly.

5. The low resistance falling film assembly of claim 1, wherein, The low-resistance falling film assembly further comprises a plurality of supporting elements (6); The supporting elements (6) are arranged between the shell and the separation membrane assembly and are uniformly distributed on the outer surface of the separation membrane assembly.

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