CN110180334A - Finned gas separation membrane module - Google Patents

Abstract

The invention relates to the technical field of membrane gas separation, in particular to a finned gas separation membrane module. The invention includes: a permeate gas outlet pipe interface, a membrane bag and a permeate gas collection pipe; the permeate gas collection pipe is a hollow tubular structure with two ends open or one end open, and the open port is connected to the permeate gas outlet pipe interface; the permeate gas collection pipe There are several slender slits for installing film bags evenly distributed on the pipe wall; the film bag is a bag made by folding two rectangular flat films or one rectangular film, with three sides closed and one side open The packaging structure; the open side is inserted into the slit, and the outside of the film bag and the inner wall of the slit are tightly sealed with adhesive; no separator such as a diversion net is set between the film bags. The technical solution of the present invention solves the problem that the deflector net and the partition plate themselves in the prior art will produce resistance to the air flow, while the gas membrane separation process is driven by the gas partial pressure difference on both sides of the membrane, and the flow resistance will lead to work The pressure difference decreases, which affects the separation effect of the membrane.

Description

Finned Gas Separation Membrane Module

technical field

The invention relates to the technical field of membrane gas separation, in particular to a finned gas separation membrane module.

Background technique

Compared with traditional cryogenic distillation and pressure swing adsorption separation technology, membrane gas separation technology has the advantages of low investment, high efficiency, small equipment size, easy operation, normal temperature operation, and low operating cost. It has been more and more widely used in recent years. application.

Membranes commonly used in gas separation are divided into flat membranes and hollow fiber membranes according to their shapes. Compared with hollow fiber membranes, flat membranes have a simpler structure and lower production costs. They are used in air separation, oil and gas recovery, and recovery and treatment of volatile organic compounds (VOCs). widely. There are three types of flat membrane module structures that are commonly used: roll type, stacked type, and plate-and-frame type. The membrane modules of the above structures have a common feature that the membranes are made into membrane bags, and multiple membrane bags are rolled on the central tube. on or stacked on the central tube that runs through the membrane bag. In order to prevent the tight fit between the membranes and hinder the air flow, a guide net or a partition plate is provided between the membrane bags and inside the membrane bags to play a supporting role and provide a flow channel for the flow of raw material gas and permeate gas. The plate-and-frame membrane module is rarely used due to its complex structure and small membrane filling area per unit volume. For roll-type membranes, there are diversion nets between the membrane bags and inside the membrane bags, and the permeate air in the membrane bags flows into the central pipe. Dividers between membrane pockets reduce the effective membrane area. The flow guide net and the partition plate themselves will produce resistance to the air flow, and the gas membrane separation process is driven by the gas partial pressure difference on both sides of the membrane. The flow resistance will reduce the working pressure difference and affect the membrane separation effect. In addition, the joint between the guide net and the partition plate and the membrane will also reduce the effective membrane area. Under the working conditions of low feed gas pressure or negative pressure of permeation pumping, the negative impact of the above factors on membrane separation performance is particularly significant. Taking membrane air oxygen enrichment as an example, usually the raw material pressure is 10-50KPa, and the permeation gas pressure is negative pressure 90-30KPa. Even if the resistance drops by 10KPa on both sides, the driving force of oxygen permeating through the membrane will drop by 15-50%. , coupled with the loss of effective membrane area, will seriously affect the oxygen enrichment concentration and gas production of the membrane module.

In view of the above-mentioned problems in the prior art, it is necessary to study and design a novel finned gas separation membrane module to overcome the problems in the prior art.

Contents of the invention

According to the above-mentioned prior art, the guide net and the partition plate themselves will generate resistance to the airflow, while the gas membrane separation process is driven by the gas partial pressure difference on both sides of the membrane, and the flow resistance will lead to a decrease in the working pressure difference, affecting In order to solve the technical problem of membrane separation effect, a finned gas separation membrane module is provided, which can effectively reduce the flow resistance of feed gas and permeate gas, minimize the loss of pressure difference on both sides of the membrane and the loss of effective membrane area, and maximize the performance of the membrane module .

The technical means adopted in the present invention are as follows:

A finned gas separation membrane module includes: a permeate gas outlet pipe interface, a membrane bag and a permeate gas collection pipe; a plurality of membrane bags are arranged on the outside of the permeate gas collection pipe, and the two ends of the permeate gas collection pipe are respectively equipped with A permeate gas outlet pipe interface or only one end is provided with a permeate gas outlet pipe interface; the permeate gas collection pipe is a hollow tubular structure with two ends open or one end open, and the open port is connected to the permeate gas outlet pipe interface; the permeate gas collection pipe There are several slender slits for installing film bags evenly distributed on the pipe wall; the film bag is a bag made by folding two rectangular flat films or one rectangular film, with three sides closed and one side open Packing structure; the open side is inserted into the slit, and the outside of the film bag and the inner wall of the slit are tightly sealed with adhesive; there is no spacer such as a diversion net between the film bags, and the gap between the film bags is maintained by the rigidity of the film bag itself .

Further, the cross section of the permeate gas collecting pipe is a circular, rectangular or other hollow tubular structure.

Further, the length of the open side of the film bag is equal to the length of the slit.

Further, a guide net is arranged inside the membrane bag.

Further, the slits are linear or wavy.

Further, the slits are arranged in parallel along the axis direction or spirally arranged along the axis direction.

Compared with the prior art, the present invention has the following advantages:

1. The finned gas separation membrane module provided by the present invention has a simple and reliable structure and is easy to manufacture;

2. The finned gas separation membrane module provided by the present invention does not have a diversion net between membrane bags, so the loss of raw material gas flow resistance is the smallest, and the loss of effective membrane area is the smallest;

3. In the finned gas separation membrane module provided by the present invention, the permeate flow path of the membrane bag is short, and can be set according to needs, so that the permeate flow resistance is limited within the allowable range;

4. In the finned gas separation membrane module provided by the present invention, the permeate gas collection pipe can provide strength support and installation positioning for the membrane module, and can be conveniently installed in the membrane separator shell for use in practical applications, which is convenient for assembly, disassembly and replacement;

5. The finned gas separation membrane module provided by the present invention, under the low-pressure operating condition with the fan as the raw material gas power, compared with the coiled membrane module, the processing capacity per unit membrane area of the former can be increased by 15% Above; compared with the stacked membrane, the effective membrane area is increased by more than 10%;

6. The finned gas separation membrane module provided by the present invention does not have the obstruction of the guide net between the membrane bags, so that it is difficult for particles such as dust in the air to accumulate and block, thereby reducing membrane pollution and prolonging the service life of the membrane

7. In the finned gas separation membrane module provided by the present invention, there is no direct contact between the membrane bags, which can effectively avoid membrane damage or life shortening caused by friction between the membrane bags;

8. The finned gas separation membrane module provided by the present invention has strong environmental adaptability and can work normally in the environment of temperature -50°C to 50°C, humidity 0-100%, and heavy haze.

To sum up, the application of the technical solution of the present invention solves the problem that the flow guide net and the partition plate themselves in the prior art will produce resistance to the air flow, while the gas membrane separation process is driven by the gas partial pressure difference on both sides of the membrane, and the flow The resistance will lead to a decrease in the working pressure difference and affect the separation effect of the membrane.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the three-dimensional view that the permeate gas collecting pipe of the present invention is a circular pipe structure;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the A-A view of Fig. 2;

Fig. 4 is an enlarged view of part B of Fig. 3;

Fig. 5 is a schematic diagram of the structure of a circular permeated gas collecting pipe;

Fig. 6 is the perspective view that the permeate gas collecting pipe of the present invention is a square structure;

Fig. 7 is a schematic diagram of the structure of the permeate gas collecting pipe with the slits spiraling upward;

Fig. 8 is a schematic diagram of the structure of the permeate gas collecting pipe with wavy slits.

In the figure: 1. Permeate gas outlet pipe interface 2. Membrane bag 3. Permeate gas collection pipe 4. Slit 5. Diversion net.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. At the same time, it should be clear that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized description. In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that orientation words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. indicate the orientation Or positional relationship is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. In the absence of a contrary description, these orientation words do not indicate or imply the device or element referred to. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as limiting the scope of the present invention: the orientation words "inside and outside" refer to inside and outside relative to the outline of each part itself.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. its underlying device or construction". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. To limit the protection scope of the present invention.

As shown in the figure, the present invention provides a finned gas separation membrane module including: a permeate gas outlet pipe interface 1, a membrane bag 2 and a permeate gas collection pipe 3; a plurality of membrane bags 2 are arranged on the permeate gas collection pipe 3, the two ends of the permeated gas collection pipe 3 are provided with a permeated gas outlet pipe interface or only one end is provided with a permeated gas outlet pipe interface 1; the permeated gas collection pipe 3 is a hollow tubular structure, and its two ends are open or One end is open, and the open port is connected to the permeate gas outlet pipe interface 1; the wall of the permeate gas collection pipe 3 is evenly distributed with several slender slits 4 for installing the membrane bag 2; the membrane bag 2 is composed of two A rectangular flat film or a rectangular film is folded to form a bag structure with three sides closed and one side open; the open side is inserted into the slit 4, and the outside of the film bag 2 and the inner wall of the slit 4 are sealed tightly with adhesive; No spacers such as diversion nets are set between the film bags 2, and the gap between the film bags is maintained by the rigidity of the film bags themselves.

The cross-section of the permeate gas collecting pipe 3 is a hollow tubular structure of a circle, a rectangle or other shapes.

The length of film bag 2 open sides is equal to the seam length of slit 4.

The inside of the film bag 2 is provided with a guide net 5 .

The slit 4 is a linear or wave-shaped slit.

The slits 4 are arranged in parallel along the axis direction or spirally arranged along the axis direction.

Example 1

As shown in Figures 1-5, the present invention provides a permeate gas collection pipe 3 which is a round pipe, the pipe wall is provided with a number of linear slits parallel to the axis and uniformly distributed, and the membrane bag is like a slit protruding from the pipe wall. The fins are arranged radially. The raw material gas is pushed by the fan (or compressor, air pump) to flow through the membrane module from the gap between the membrane bag 2 and the membrane bag 2 along the axis direction of the permeate gas collection pipe 3. The pressure of the raw material gas (outside the membrane bag) is higher than the pressure inside the membrane bag, so that The pressure difference between the inside and outside of the membrane bag is the driving force, and the gas permeates to the low-pressure side (inside the membrane bag), and the gas that permeates through the membrane enters each membrane bag and collects in the permeate gas collection pipe. The gas that has not permeated the membrane is discharged from the other end of the membrane bag, the gas with a faster permeation rate is enriched in the permeate gas collection pipe, and the gas with a slower permeation rate is enriched at the outlet on the raw material side. Taking air as an example, oxygen with a faster permeation rate is enriched in the permeate gas collecting pipe, and nitrogen with a slower permeation rate is enriched at the outlet on the raw material side. The permeate gas outlet pipe 1 can be provided at both ends of the permeate gas collecting pipe 3, or only at one end, and can be drawn out along the axis or from the side wall.

Example 2

As shown in Figure 6, (on the basis of Embodiment 1), the present invention also provides a permeate gas collection pipe 3 is a square pipe, one side wall of the square pipe (or two opposite sides are symmetrically distributed) along the There are several uniformly distributed and parallel linear slits in the length direction, and the film bags are distributed in parallel like fins protruding from the slits on the tube wall. Concrete working principle is the same as embodiment 1.

Example 3

As shown in Figure 7, (on the basis of Example 1), the structure of the membrane module is similar to that of Example 1, but the slit of the permeate gas collection pipe is not parallel to the axis, but is helical along the pipe wall, and the corresponding membrane The bag is also in the shape of spiral fins, which makes the raw material gas form a turbulent flow to improve the air flow distribution when the raw material gas passes through the module, fully exert the membrane separation performance, and at the same time improve the rigidity of the membrane bag.

Example 4

As shown in Figure 8, (on the basis of Example 1), the structure of the membrane module is similar to that of Example 2, but the slit of the permeate gas collection pipe is not a straight line, but a wavy line along the length of the pipe wall, and the corresponding membrane bag It is also in the shape of wavy fins, which makes the raw material gas form a turbulent flow to improve the air distribution when the raw material gas passes through the module, fully exert the membrane separation performance, and at the same time improve the rigidity of the membrane bag.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (6)

1. A finned gas separation membrane module, characterized in that said finned gas separation membrane module comprises: a permeated gas outlet pipe interface (1), a membrane bag (2) and a permeated gas collection pipe (3) ;Multiple membrane bags (2) are arranged on the outside of the permeate gas collection pipe (3), and the two ends of the permeate gas collection pipe (3) are respectively provided with a permeate gas outlet pipe interface or only one end is provided with a permeate gas outlet pipe interface (1); The permeated gas collection pipe (3) is a hollow tubular structure with two ends open or one end open, and the open port is connected to the permeated gas outlet pipe interface (1); the permeated gas collection pipe (3) is evenly distributed on the wall There are several slender slits (4) for installing the membrane bag (2); The film bag (2) is a bag structure in which three sides are closed and one side is open after folding two rectangular flat films or a rectangular film; the open side is inserted into the slit (4), and the film bag (2) The exterior and the inner wall of the slit (4) are tightly sealed with an adhesive; no spacers such as diversion nets are set between the film bags (2), and the gap between the film bags is maintained by the rigidity of the film bags themselves. 2. The finned gas separation membrane module according to claim 1, characterized in that, the cross-section of the permeated gas collecting pipe (3) is a hollow tubular structure with a circular, rectangular or other shape. 3. The finned gas separation membrane module according to claim 1, characterized in that the length of the open side of the membrane bag (2) is equal to the length of the slit (4). 4. The finned gas separation membrane module according to claim 3, characterized in that, a flow guide net (5) is arranged inside the membrane bag (2). 5. The finned gas separation membrane module according to claim 3, characterized in that, the slits (4) are linear or wave-shaped slits. 6 . The finned gas separation membrane module according to claim 5 , characterized in that, the slits ( 4 ) are arranged in parallel along the axial direction or spirally arranged along the axial direction.