Membrane reactor capable of improving gas absorption capacity

Abstract

The utility model discloses a membrane reactor capable of improving gas absorption capacity, which comprises a barren liquor box, a rich liquor box and a plurality of breathable membranes, an absorbent is introduced into the barren liquor box, each breathable membrane comprises two breathable layers, the two sides of the two breathable layers are sealed to form a vertically through solution channel, and the rich liquor box is communicated with the two breathable layers. The upper end and the lower end of the solution channel are connected with a barren liquor box and a rich liquor box respectively, and a heat exchange device used for cooling the membrane is arranged on the membrane. According to the scheme, the heat exchange device is arranged on the membrane to cool the membrane, so that the temperature of the absorbent flowing through the membrane is reduced, and the problem of low greenhouse gas absorption capacity caused by temperature rise due to the fact that the absorbent is placed in an external environment can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of membrane reactor technology, and in particular relates to a membrane reactor that can enhance gas absorption capacity. Background Technology

[0002] The greenhouse effect, caused by the greenhouse gas, is a significant environmental problem facing the world. Internationally, the primary greenhouse gas identified is carbon dioxide, which is absorbed by the sun's long-wave radiation. Increases in the atmosphere from these gases lead to glacial melting, rising sea levels, changes in atmospheric circulation, and more frequent extreme weather events.

[0003] Using membrane reactors to collect and extract greenhouse gases is a common method. Its working principle is based on the coupling of the selective permeability of the membrane material and the reaction process. Carbon dioxide reacts with a chemical absorbent loaded inside or on the membrane to form stable compounds, which are then desorbed and recovered through heating or depressurization. Currently, the main type of membrane reactor on the market is the hollow fiber membrane contact reactor. By circulating absorbent between two membrane layers and placing it in a natural environment, it can absorb carbon dioxide from the atmosphere.

[0004] Based on the working principle of membrane reactors, it is known that factors affecting the efficiency of membrane reactors in absorbing greenhouse gases include the concentration of the absorbent, the temperature of the absorbent, and the area of ​​the absorbent spread on the membrane. Inspired by the above factors, this application designs a membrane reactor that can improve the gas absorption efficiency of membrane reactors. Utility Model Content

[0005] The purpose of this invention is to provide a membrane reactor that can improve gas absorption capacity, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention employs the following technical solution: a membrane reactor capable of enhancing gas absorption capacity, comprising a lean solution tank, a rich solution tank, and several permeable membranes. An absorbent is introduced into the lean solution tank. The permeable membranes comprise two permeable layers, with their sides sealed to form a vertically penetrating solution channel. The upper and lower ends of the solution channel are respectively connected to the lean solution tank and the rich solution tank. A heat exchange device for cooling the membranes is provided on the membranes.

[0007] Preferably, the heat exchange device includes a heat exchange channel through which a cold source gas / liquid is introduced.

[0008] Preferably, the heat exchange channel is placed between the two breathable layers of the breathable membrane.

[0009] Preferably, the heat exchange channel comprises a hollow capillary.

[0010] Preferably, a plurality of liquid inlet channels are provided between the two breathable layers of the breathable membrane. One end of the liquid inlet channel is placed outside the breathable membrane and connected to the absorbent, while the other end of the liquid inlet channel is placed between the two breathable layers and the positions and heights are not exactly the same.

[0011] Preferably, a plurality of liquid outlet channels are provided between the two breathable layers of the breathable membrane. One end of the liquid outlet channel is placed outside the breathable membrane and discharges the absorbent. The other end of the liquid outlet channel is placed between the two breathable layers, and at least one liquid inlet channel is provided above it at the end placed between the two breathable layers.

[0012] Preferably, the absorbent is introduced into the breathable membrane only through the liquid inlet channel, or through a combination of the liquid inlet channel and the solution channel of the breathable membrane, and the absorbent is discharged from the breathable membrane through the liquid outlet channel and / or the solution channel of the breathable membrane.

[0013] Preferably, a skeleton layer is provided between the two breathable layers, and the tensile and compressive strengths of the skeleton layer are greater than those of the breathable layers.

[0014] Preferably, the breathable layer is made of PTFE material and the skeleton layer is made of PET material.

[0015] Preferably, the skeleton layer is hollowed out.

[0016] The beneficial effects of this utility model are as follows: This solution cools the membrane by setting a heat exchange device on the membrane, thereby reducing the temperature of the absorbent flowing through the membrane. This avoids the problem of insufficient greenhouse gas absorption capacity caused by the temperature rise of the absorbent in the external environment.

[0017] By setting up liquid inlet channels and positioning them at different ends on the breathable membrane, the absorbent can be better distributed within the breathable membrane, thus enhancing the absorption of greenhouse gases.

[0018] In this way, by setting up a liquid distribution outlet channel, the absorbent placed inside the membrane can be discharged more quickly, which reduces the problem of low absorption efficiency caused by the absorbent remaining in the membrane after the absorption greenhouse starts or the dilution of unabsorbed greenhouse gases.

[0019] By setting up a skeleton layer, the service life of the membrane reactor can be effectively extended. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a conventional membrane reactor;

[0021] Figure 2 This is an exploded view of a conventional membrane reactor;

[0022] Figure 3 This is an example of a structural schematic diagram of this utility model;

[0023] Figure 4 Example 2 is a schematic diagram of the structure of this utility model;

[0024] Figure 5 This is a schematic diagram showing the connection relationship between the heat exchange device and the membrane reactor in Example 1 of this utility model;

[0025] Figure 6 This is a schematic diagram of the heat exchange device in this utility model;

[0026] Figure 7 This is a schematic diagram showing the positional relationship between connecting pipe 1, connecting pipe 2, and heat exchange channel in this utility model;

[0027] Figure 8 This is a schematic diagram showing the arrangement of the liquid inlet channel and the liquid outlet channel on the breathable diaphragm in this utility model;

[0028] Figure 9 This is a schematic diagram showing the arrangement of the heat exchange device, liquid inlet channel, and liquid outlet channel on the breathable membrane in this utility model.

[0029] Figure 10 This is a cross-sectional schematic diagram of the breathable membrane in this utility model;

[0030] In the diagram: 1. Lean solution tank; 101. Connecting channel one; 2. Breathable membrane; 201. Breathable layer; 202. Skeleton layer; 3. Rich solution tank; 301. Connecting channel two; 4. Support plate; 5. Connecting pipe one; 6. Connecting pipe two; 7. Heat exchange channel; 8. External pipe one; 9. External pipe two; 10. Liquid distribution input channel; 11. Liquid distribution output channel. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention. Example

[0032] See Figure 1A membrane reactor capable of enhancing gas absorption capacity includes a lean solution tank 1, a rich solution tank 3, and several permeable membrane sheets 2. The lean solution tank 1 and the rich solution tank 3 are connected and supported by a support plate 4. An absorbent, such as an alkanolamine solution, is introduced into the lean solution tank 1. Each permeable membrane sheet 2 includes two permeable layers 201, with their sides sealed to form a vertically penetrating solution channel. Specifically, a TPU film can be used for sealing. The upper and lower ends of the solution channel are connected to the lean solution tank 1 and the rich solution tank 3, respectively. For details, please refer to [reference needed]. Figure 2 Connecting through groove 101 and connecting through groove 301 are respectively provided on the lean solution tank 1 and the rich solution tank 3. (See reference...) Figure 3 The diaphragm is equipped with a heat exchange device for cooling the diaphragm, wherein, see reference Figure 10 A skeleton layer 202 is provided between the two permeable layers 201. The tensile and compressive strengths of the skeleton layer 202 are greater than those of the permeable layers 201. Specifically, the skeleton layer is designed with a hollow shape to facilitate the passage of absorbent. The permeable layers 201 are made of PTFE material, and the skeleton layer 202 is made of PET material. By attaching the permeable layers 201 to both sides of the skeleton layer 202 and sealing the edges with waterproof and corrosion-resistant material, the overall permeable membrane 2 is made. The permeable membrane 2 can be fixed and sealed with resin to the lean liquid tank 1 and the rich liquid tank 3. The lean liquid tank 1, the permeable membrane 2, and the rich liquid tank 3 can be connected by pipes to form a circulation system. The function of releasing and collecting absorbed greenhouse gases can be achieved by assuming a heat source, etc. This is the conventional structure of the membrane reactor mentioned in the background art, which will not be described in detail here.

[0033] Among them, see Figure 3-7 , Figure 9 The heat exchange device includes a heat exchange channel 7, through which a cold source gas / liquid is introduced. The cold source gas / liquid can be water, ammonia, etc., and can be connected via connecting pipes. Specifically, connecting pipe 5 is connected above the heat exchange channel 7, and connecting pipe 6 is connected below the heat exchange channel 7 (for specific configuration, please refer to [reference needed]). Figure 3 , Figure 4 The given two positional and structural relationships between connecting pipe 5, connecting pipe 6, and lean liquid tank 1 and rich liquid tank 3 are shown. At the same time, the connecting pipe can also be set to a circulating connection and use an external refrigeration device to keep the gas / liquid at a low temperature. This is also a conventional technology and will not be described in detail here.

[0034] The heat exchange channel 7 is placed between the two breathable layers 201 of the breathable membrane 2. Specifically, the heat exchange channel 7 includes a hollow capillary.

[0035] Among them, see Figure 8 , Figure 9 A plurality of liquid inlet channels 10 are provided between the two breathable layers 201 of the breathable membrane 2. One end of the liquid inlet channel 10 is placed outside the breathable membrane 2 and connected to the absorbent. This end can be placed directly in the lean liquid tank 1 or connected to the absorbent through an external pipe 8. The other end of the liquid inlet channel is placed between the two breathable layers 201 and the position and height are not exactly the same.

[0036] The breathable membrane 2 has several liquid outlet channels 11 between its two breathable layers 201. One end of each liquid outlet channel 11 is placed outside the breathable membrane 2 and discharges the absorbent. This end can be placed inside the rich liquid tank 3 or can discharge the absorbent through an external pipe 2 9. Of course, the external pipe 1 8 and the external pipe 2 9 can be interconnected to form a circulation structure. The other end of each liquid outlet channel is placed between the two breathable layers 201 and above it is provided an end of a liquid inlet channel 10 placed between the two breathable layers 201.

[0037] In this embodiment, the absorbent is introduced into the breathable membrane 2 only through the liquid inlet channel, or through the liquid inlet channel and the solution channel of the breathable membrane 2 together. The absorbent is discharged from the breathable membrane 2 through the liquid outlet channel and / or the solution channel of the breathable membrane 2. Specifically, in the scheme where the absorbent is introduced into the breathable membrane 2 only through the liquid inlet channel, the membrane solution channel can be sealed with resin.

[0038] Working principle and process:

[0039] When using this product, the relevant absorbent is injected into the lean solution tank. After absorbing the response gas through the solution channel, the absorbent enters the rich solution tank. During this process, the absorbent is cooled by a heat exchange device to ensure its absorption capacity.

[0040] This scheme uses a membrane reactor to absorb greenhouse gases. At the same time, the chemical heat generated by the absorbent during gas absorption is absorbed by a heat exchange device, which cools the membrane and alleviates the problem of weak absorption capacity caused by high absorbent temperature.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A membrane reactor capable of improving gas absorption capacity, comprising a lean liquid tank (1), a rich liquid tank (3) and a plurality of gas permeable membranes (2), the lean liquid tank (1) being provided with an absorbent, characterized in that: The gas-permeable membrane (2) comprises two gas-permeable layers (201), and the two gas-permeable layers (201) are sealed on both sides to form a solution channel penetrating from top to bottom, the upper and lower ends of the solution channel are connected with a lean liquid tank (1) and a rich liquid tank (3) respectively, and a heat exchange device for cooling the membrane is arranged on the membrane.

2. The membrane reactor capable of enhancing the gas absorption capacity according to claim 1, wherein: The heat exchange device comprises a heat exchange flow channel (7) into which a cold source gas / liquid is introduced.

3. The membrane reactor capable of enhancing the gas absorption capacity according to claim 2, wherein: The heat exchange flow channel (7) is arranged between the two gas-permeable layers (201) of the gas-permeable membrane (2).

4. The membrane reactor capable of enhancing the gas absorption capacity according to claim 3, wherein: The heat exchange flow channel (7) comprises a hollow capillary tube.

5. The membrane reactor capable of enhancing the gas absorption capacity according to claim 1, wherein: A plurality of liquid distribution input flow channels (10) are arranged between the two gas-permeable layers (201) of the gas-permeable membrane (2), one end of the liquid distribution input flow channel (10) is arranged outside the gas-permeable membrane (2) and connected with an absorbent, and the other end of the liquid distribution input flow channel (10) is arranged between the two gas-permeable layers (201) and is not completely identical in position and height.

6. The membrane reactor capable of enhancing the gas absorption capacity according to claim 5, wherein: A plurality of liquid distribution output flow channels (11) are arranged between the two gas-permeable layers (201) of the gas-permeable membrane (2), one end of the liquid distribution output flow channel (11) is arranged outside the gas-permeable membrane (2) and discharges the absorbent, and the other end of the liquid distribution output flow channel (11) is arranged between the two gas-permeable layers (201), and at least one end of the liquid distribution input flow channel (10) arranged between the two gas-permeable layers (201) is arranged above it.

7. The membrane reactor capable of enhancing the gas absorption capacity according to claim 6, wherein: The gas-permeable membrane (2) inputs the absorbent only through the liquid distribution input flow channel, or through the liquid distribution input flow channel and the solution channel of the gas-permeable membrane (2) together, and the gas-permeable membrane (2) discharges the absorbent through the liquid distribution output flow channel and / or the solution channel of the gas-permeable membrane (2).

8. The membrane reactor capable of enhancing gas absorption capacity according to claim 1, wherein: A skeleton layer (202) is arranged between the two gas-permeable layers (201), and the tensile and compressive strength of the skeleton layer (202) is greater than that of the gas-permeable layer (201).

9. The membrane reactor capable of enhancing the gas absorption capacity according to claim 8, wherein: The skeleton layer is in a hollowed-out shape.

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