A nested-based carbon capture multi-component gas tubular membrane separation device

Abstract

The present application relates to gas separation and purification technology field, disclose a kind of based on nested carbon capture multi-component gas pipe membrane separation equipment, comprising: nested membrane separation component, setting in cylinder, it includes first separation membrane tube and the second separation membrane tube of the first separation membrane tube outside sleeve;First separation membrane tube is communicated with gas inlet and first gas outlet respectively, for separating part first gas;Gas separation chamber is communicated with gas inlet and retentate gas outlet respectively, part first gas penetrates into first separation membrane tube, second gas penetrates through second separation membrane tube and is discharged from second gas outlet, raw gas separates first gas and second gas, and becomes retentate gas and is discharged from retentate gas outlet after.The first separation membrane tube and the second separation membrane tube in nested membrane separation component can separate and purify first gas and second gas in raw gas, improve gas separation efficiency, reduce the height of equipment, and improve the operability of equipment.

Description

A nested carbon capture multi-component gas tubular membrane separation device Technical Field

[0001] This invention relates to the field of gas separation and purification technology, and in particular to a nested carbon capture multi-component gas tubular membrane separation device. Background Technology

[0002] Gas separation and purification technologies include adsorption technology, membrane separation technology, and cryogenic separation technology. Among them, membrane separation technology refers to the separation and purification of gases by utilizing the selective permeability of membranes and the different diffusion rates of different gas molecules due to differences in their chemical and physical properties, driven by the pressure difference across the membrane.

[0003] Existing membrane separation technologies typically employ a double-tube membrane separation assembly consisting of an outer cylinder and a tubular membrane. For example, CN101264423A discloses a membrane separation device including a feed supply pipe, a liquid flow channel, an air inlet pipe, a water mixing channel, a product water pipe, a feed return pipe, and a separator that divides the internal space of the membrane separation device into two or more liquid flow channels. A valve is installed on the feed return pipe; the separator may have no holes or partial holes; the length of the separator is less than or equal to the length of the shell in the liquid flow direction; the shapes of the divided liquid flow channels can be identical, such as cylindrical, prismatic, or irregular shapes; the liquid flow channels can be arranged arbitrarily on the cross-section of the shell perpendicular to the liquid flow direction.

[0004] CN205570048U discloses a purified gas membrane separation device, including an inlet and an outlet on a membrane module, a purified gas outlet on a shell, an inlet, and an outlet. The inlet on the membrane module is connected to the inlet on the shell, and the outlet on the membrane module is connected to the outlet on the shell. The cylindrical membrane module is located inside the shell. The separated and purified gas permeates through the membrane into the space between the membrane and the shell, and is discharged through the first outlet. The two ends of the cylinder are sealed together by flange bolts.

[0005] CN116059801A discloses a gas membrane separation device and a method for selective gas separation. The device consists of multiple separation modules connected in series. The inlets and outlets of adjacent modules are connected via gas delivery pipes, each equipped with a pressure gauge. Each separation module includes a membrane cover, a raw material inlet, an outlet, a gas collection port, a separation membrane, a membrane clamp, and a gas collection pipeline. Both the membrane clamp and the membrane cover have a connecting port located at the outlet of the separation module. The separation membrane is located at the connecting port between two membrane clamps and is fixed by the membrane clamp. The connection sequence is: membrane cover, membrane clamp, membrane, membrane clamp, and the outlet of the gas collection pipeline. The other end of the membrane cover is connected and sealed to the gas delivery pipeline connecting to the inlet of the next module. The gas collection port is located above the module, and the gas purified by the raw material gas (GP) is discharged from the gas collection port.

[0006] However, such dual-sleeve membrane separation modules typically can only separate and purify single-component gases, and the limited membrane separation area results in low membrane separation efficiency. Therefore, how to provide a device capable of separating and purifying two-component gases and improving membrane separation efficiency is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a nested carbon capture multi-component gas tubular membrane separation device to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention provides a nested carbon capture multi-component gas tubular membrane separation device, comprising:

[0009] The cylinder has a gas inlet at the bottom, a first gas outlet at the top, and a residual gas outlet and a second gas outlet on the side.

[0010] A nested membrane separation assembly is disposed within a cylindrical body. It includes a first separation membrane tube and a second separation membrane tube sleeved outside the first separation membrane tube, forming a gas separation chamber between the first and second separation membrane tubes. The first separation membrane tube is connected to a gas inlet and a first gas outlet, respectively, for separating a portion of the first gas. The gas separation chamber is connected to a gas inlet and a residual gas outlet, respectively. A portion of the first gas permeates into the first separation membrane tube, and the second gas permeates through the second separation membrane tube and exits from the second gas outlet. After separating the first and second gases, the feed gas becomes residual gas and exits from the residual gas outlet.

[0011] Furthermore, a permeation membrane is provided at the bottom of the first separation membrane tube. The permeation membrane is made of the same material as the first separation membrane tube. The bottom of the first separation membrane tube is connected to the gas inlet through the permeation membrane, and the top is connected to the first gas outlet. The raw material gas enters the cylinder from the gas inlet, and part of the first gas in the raw material gas enters the first separation membrane tube from the bottom and exits from the first gas outlet.

[0012] Furthermore, the bottom of the second separation membrane tube is connected to the gas inlet, and the top is connected to the second gas outlet. The raw material gas enters the cylinder from the gas inlet and enters the gas separation chamber from the bottom of the second separation membrane tube. Part of the first gas permeates into the first separation membrane tube, and the second gas permeates through the second separation membrane tube and is discharged from the second gas outlet.

[0013] Furthermore, it also includes:

[0014] A first fixing plate is disposed inside the cylinder and close to the gas inlet. The bottom of the second separation membrane tube is sealed and installed on the first fixing plate. The first separation membrane tube extends from the bottom of the second separation membrane tube and extends toward the gas inlet.

[0015] The second fixing plate is disposed inside the cylinder and near the residual gas outlet, and the top of the second separation membrane tube is sealed and installed on the second fixing plate;

[0016] The cylinder has a permeate gas outlet and a second gas outlet sequentially opened from top to bottom. The partition is disposed inside the cylinder and located between the first gas outlet and the permeate gas outlet. The first separation membrane tube extends from the top of the second separation membrane tube and extends toward the first gas outlet. The first separation membrane tube seals through the partition.

[0017] Furthermore, it also includes:

[0018] A third fixing plate is disposed inside the cylinder and near the gas inlet, and the bottom of the first separation membrane tube is mounted on the third fixing plate.

[0019] Furthermore, the first gas and the second gas are the same gas or two different gases; when the first gas and the second gas are the same gas, the first separation membrane tube and the second separation membrane tube are made of the same material or are made of different materials capable of separating the same gas.

[0020] The present invention discloses the following technical effects:

[0021] 1. This invention utilizes a nested membrane separation assembly with a first and a second separation membrane tube to separate and purify a first gas and a second gas in a feed gas. The separation paths are as follows: For the first gas, there are two separation and purification paths. First, the feed gas enters the cylinder from the inlet and begins separation upon contact with the bottom of the first separation membrane tube; that is, the first gas directly enters the first separation membrane tube from the bottom and exits from the outlet. Second, after entering the gas separation chamber, it permeates into the first separation membrane tube from the outside. Compared to existing technologies, this membrane tube fixing method and design fully utilize the membrane separation area. For the second gas, after entering the gas separation chamber, it permeates through the second separation membrane tube and exits from the outlet. The separation paths of the first and second gases in the gas separation chamber are opposite, and they do not interfere with each other. Compared to existing technologies, two component gases can be separated in a single process.

[0022] 2. When the first gas and the second gas are the same gas, the gas separation path is the sum of the separation paths of the first gas and the second gas. Compared with existing technologies, the membrane separation area is significantly increased, thereby improving gas separation efficiency. Furthermore, compared with existing technologies, this nested membrane separation device can shorten the overall height of the equipment and simplify its operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 is a schematic diagram of the structure of the present invention;

[0025] Figure 2 is a schematic diagram of gas separation;

[0026] Wherein, 1, cylinder; 101, gas inlet; 102, first gas outlet; 103, residual gas outlet; 104, second gas outlet; 2, first separation membrane tube; 3, second separation membrane tube; 4, gas separation chamber; 5, permeate membrane; 6, first fixed plate; 7, second fixed plate; 8, partition plate; 9, third fixed plate; GA, first gas; GB, second gas; GP, feed gas; GE, residual gas. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] As shown in Figures 1 and 2, this embodiment of the invention provides a nested carbon capture multi-component gas tubular membrane separation device, comprising:

[0031] The cylinder 1 has a gas inlet 101 at the bottom, a first gas outlet 102 at the top, and a residual gas outlet 103 and a second gas outlet 104 on the side. The number and size of the gas inlet 101, the first gas GA, the residual gas outlet 103 and the second gas outlet 104 are determined according to parameters such as the gas flow rate of the raw material gas GP flowing into the cylinder 1 and the contents of the first gas GA and the second gas GB.

[0032] A nested membrane separation assembly is disposed inside a cylindrical body 1. It includes a first separation membrane tube 2 and a second separation membrane tube 3 sleeved outside the first separation membrane tube 2. The first separation membrane tube 2 and the second separation membrane tube 3 form a gas separation chamber 4. The first separation membrane tube 2 is connected to a gas inlet 101 and a first gas outlet 102, respectively, for separating a portion of the first gas GA. The gas separation chamber 4 is connected to a gas inlet 101 and a residual gas outlet 103, respectively. A portion of the first gas GA permeates into the first separation membrane tube 2, and the second gas GB permeates through the second separation membrane tube 3 and is discharged from the second gas outlet 104. The feed gas GP, after separating the first gas GA and the second gas GB, becomes residual gas GE and is discharged from the residual gas outlet 103.

[0033] In this embodiment, a permeation membrane 5 is disposed at the bottom of the first separation membrane tube 2. The permeation membrane 5 is made of the same material as the first separation membrane tube 2 and the two are integrally formed. Overall, the first separation membrane tube 2 and the permeation membrane 5 together form a "U-shaped" gas permeation separation structure. The bottom of the first separation membrane tube 2 is connected to the gas inlet 101 through the permeation membrane 5, and the top is connected to the first gas outlet 102. The raw material gas GP enters the cylinder 1 from the gas inlet 101, and part of the first gas GA in the raw material gas GP enters the first separation membrane tube 2 from the bottom and exits from the first gas outlet 102.

[0034] In other embodiments, the first separation membrane tube 2 and the permeation membrane 5 can also be a separate structure, and the specific structural form can be flexibly selected according to the actual application scenario.

[0035] In this embodiment, the bottom of the second separation membrane tube 3 is connected to the gas inlet 101, and the top is connected to the second gas outlet 104. The raw material gas GP enters the cylinder 1 from the gas inlet 101 and enters the gas separation chamber 4 from the bottom of the second separation membrane tube 3. Part of the first gas GA permeates into the first separation membrane tube 2, and the second gas GB permeates through the second separation membrane tube 3 and is discharged from the second gas outlet 104.

[0036] In this embodiment, it also includes:

[0037] The first fixing plate 6 is disposed inside the cylinder 1 and close to the gas inlet 101. The bottom of the second separation membrane tube 3 is sealed and installed on the first fixing plate 6. The first separation membrane tube 2 is led out from the bottom of the second separation membrane tube 3 and extends towards the gas inlet 101.

[0038] The second fixing plate 7 is set inside the cylinder 1 and close to the residual gas outlet 103, and the top of the second separation membrane tube 3 is sealed and installed on the second fixing plate 7.

[0039] The top of the cylinder 1 is an elliptical sealing joint with a baffle plate 8. The cylinder 1 has a residual gas outlet 103 and a second gas outlet 104 sequentially arranged from top to bottom. The baffle plate 8 is located inside the cylinder 1, between the first gas outlet 102 and the residual gas outlet 103. The first separation membrane tube 2 extends from the top of the second separation membrane tube 3 towards the first gas outlet 102, and the first separation membrane tube 2 seals through the baffle plate 8. Sufficient sealing is required at the connections between the first fixing plate 6, the second fixing plate 7 and the second separation membrane tube 3, as well as at the connection between the baffle plate 8 and the first separation membrane tube 2. The placement, thickness, and other parameters of the first fixing plate 6, the second fixing plate 7, and the baffle plate 8 should be determined based on factors such as the flow rate of the raw material gas GP and the stress on the first separation membrane tube 2 and the second separation membrane tube 3.

[0040] In this embodiment, it also includes:

[0041] The third fixing plate 9 is set inside the cylinder 1 and close to the gas inlet 101, and the bottom of the first separation membrane tube 2 is installed on the third fixing plate 9.

[0042] The third fixing plate 9, while fixing the first separation membrane tube 2, may be subjected to thermal stress, mechanical vibration, and impact forces. The magnitude of the force is related to factors such as the flow rate and temperature of the separated gas, the pressure inside the cylinder 1, and the number of first separation membrane tubes 2 fixed. Therefore, the thickness and material of the third fixing plate 9 need to be determined by comprehensively considering the material of the first separation membrane tube 2, the magnitude of the force on the third fixing plate 9, and the properties of the gas. If the gas is highly corrosive, the material used must also have high-temperature resistance and corrosion resistance. The length and number of the first separation membrane tubes 2 extending beyond the third fixing plate 9 are determined based on the load, the material of the first separation membrane tubes 2, and other requirements.

[0043] In this embodiment, the first gas GA and the second gas GB are the same gas or two different gases; when the first gas GA and the second gas GB are the same gas, the first separation membrane tube 2 and the second separation membrane tube 3 are made of the same material or are made of different materials that can separate the same gas.

[0044] In this embodiment, the gas inlet 101, the first gas GA, the residual gas outlet 103, and the second gas outlet 104 are all equipped with valves, pressure gauges, and flow meters to regulate the pressure difference balance inside the cylinder 1 during operation, while also detecting equipment operating parameters, reducing the equipment accident rate, improving separation efficiency, and maintaining stable equipment operation.

[0045] This embodiment can be applied to gases such as CO2, CO, H2, N2, or CH4. The following examples illustrate its working process:

[0046] The feed gas GP is blast furnace gas, which contains 17%–25% CO2, 50%–55% N2, 1%–5% H2, 20%–28% CO, and trace amounts of H2O. This embodiment uses this method to separate and purify CO2 and N2 from the blast furnace gas. Correspondingly, the first separation membrane tube 2 and the second separation membrane tube 3 allow CO2 and N2 to permeate through, respectively.

[0047] All residual air in the equipment is expelled using inert gas;

[0048] Blast furnace gas is introduced into gas inlet 101. Part of the CO2 in the feed gas GP enters the first separation membrane tube 2 from the bottom and exits from the first gas outlet 102. The remaining feed gas GP enters the gas separation chamber 4 from the bottom of the second separation membrane tube 3. Part of the CO2 permeates into the first separation membrane tube 2, and N2 permeates through the second separation membrane tube 3 and exits from the second gas outlet 104. The separated and purified CO2 can be used as a raw material for chemical product synthesis, for oil displacement, or for storage. The separated and purified N2 can be used as a byproduct. The remaining CO and H2 have certain economic value and can be reused or sold as reducing gas in low-carbon smelting, supplementary heating fuel for other processes, or raw materials for chemical product synthesis.

[0049] Example 2

[0050] The difference between this embodiment and Embodiment 1 is that the first separation membrane tube 2 and the second separation membrane tube 3 are made of the same material and are both used to separate and purify CO2.

[0051] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0052] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A nested carbon capture multi-component gas tubular membrane separation device, characterized in that, include: The cylindrical body (1) has a gas inlet (101) at the bottom, a first gas outlet (102) at the top, and a residual gas outlet (103) and a second gas outlet (104) on the side. A nested membrane separation assembly is disposed inside the cylindrical body (1), comprising a first separation membrane tube (2) and a second separation membrane tube (3) sleeved outside the first separation membrane tube (2). The first separation membrane tube (2) and the second separation membrane tube (3) form a gas separation chamber (4). The first separation membrane tube (2) is connected to both the gas inlet (101) and the first gas outlet (102) for separating a portion of the first gas (GA). The gas separation chamber (4) The gas is connected to the gas inlet (101) and the permeate outlet (103) respectively. Part of the first gas (GA) permeates into the first separation membrane tube (2), and the second gas (GB) permeates through the second separation membrane tube (3) and is discharged from the second gas outlet (104). The feed gas (GP) is separated from the first gas (GA) and the second gas (GB) and becomes permeate gas (GE) and is discharged from the permeate outlet (103). A permeate membrane (5) is provided at the bottom of the first separation membrane tube (2). The permeate membrane (5) is made of the same material as the first separation membrane tube (2). The bottom of the first separation membrane tube (2) is connected to the gas inlet (101) through the permeate membrane (5).

2. The nested carbon capture multi-component gas tubular membrane separation device according to claim 1, characterized in that, The top of the first separation membrane tube (2) is connected to the first gas outlet (102). The raw material gas (GP) enters the cylinder (1) from the gas inlet (101), and part of the first gas (GA) in the raw material gas (GP) enters the first separation membrane tube (2) from the bottom and is discharged from the first gas outlet (102).

3. The nested carbon capture multi-component gas tubular membrane separation device according to claim 2, characterized in that, The bottom of the second separation membrane tube (3) is connected to the gas inlet (101), and the top is connected to the second gas outlet (104). The raw material gas (GP) enters the cylinder (1) from the gas inlet (101) and enters the gas separation chamber (4) from the bottom of the second separation membrane tube (3). Part of the first gas (GA) permeates into the first separation membrane tube (2), and the second gas (GB) permeates through the second separation membrane tube (3) and is discharged from the second gas outlet (104).

4. The nested carbon capture multi-component gas tubular membrane separation device according to claim 3, characterized in that, Also includes: The first fixing plate (6) is disposed inside the cylinder (1) and close to the gas inlet (101). The bottom of the second separation membrane tube (3) is sealed and installed on the first fixing plate (6). The first separation membrane tube (2) is led out from the bottom of the second separation membrane tube (3) and extends towards the gas inlet (101). The second fixing plate (7) is disposed inside the cylinder (1) and close to the residual gas outlet (103). The top of the second separation membrane tube (3) is sealed and installed on the second fixing plate (7). The partition plate (8) is provided with a residual gas outlet (103) and a second gas outlet (104) from top to bottom in the cylinder (1). The partition plate (8) is disposed inside the cylinder (1) and located between the first gas outlet (102) and the residual gas outlet (103). The first separation membrane tube (2) is led out from the top of the second separation membrane tube (3) and extends towards the first gas outlet (102). The first separation membrane tube (2) seals and penetrates the partition plate (8).

5. A nested carbon capture multi-component gas tubular membrane separation device according to claim 4, characterized in that, Also includes: The third fixing plate (9) is disposed inside the cylinder (1) and close to the gas inlet (101), and the bottom of the first separation membrane tube (2) is mounted on the third fixing plate (9).

6. A nested carbon capture multi-component gas tubular membrane separation device according to claim 1, characterized in that, The first gas (GA) and the second gas (GB) are the same gas or two different gases; when the first gas (GA) and the second gas (GB) are the same gas, the first separation membrane tube (2) and the second separation membrane tube (3) are made of the same material or are made of different materials that can separate the same gas.

Images