Gas trapping device

Abstract

The utility model provides a gas trapping device which comprises a tower body, and a waste gas inlet, a purification chemical solution inlet and a saturated solution outlet are respectively formed in the side surface, the top and the bottom of the tower body; the packing layer comprises a regular packing layer fixedly arranged below the purification chemical solution inlet and a Pall ring packing layer fixedly arranged above the saturated solution outlet; the liquid spraying and shunting assembly is arranged between the waste gas inlet and the structured packing layer and comprises a central cylinder fixedly arranged in the tower body, a plurality of gas outlets are formed in the upper surface of the central cylinder, guide plates are fixedly arranged above the gas outlets at a certain distance, liquid guide grooves are fixedly formed between the gas outlets, and the liquid guide grooves are of a multi-layer step structure; the liquid guide groove is communicated with a drainage pipe through a tray, and the output end of the drainage pipe is in contact with the Pall ring packing layer. According to the utility model, the Pall ring packing layer of the liquid spraying and shunting component is matched for use, so that the content of oxygen entrained by a saturated solution can be obviously reduced, and the purity of specified gas collected by the trapping device can be better improved.

Description

Technical Field

[0001] This utility model relates to the field of gas capture equipment technology, and in particular to a gas capture device. Background Technology

[0002] The proportions of O2 and CO in the characteristic components of exhaust gas are much higher than those of other gases. Therefore, the bottom design of the absorption tower for capturing other corresponding low-concentration gases must prevent saturated chemical solutions from entraining oxygen into the absorption tower. In ordinary packed absorption towers, the inlet pipe leads directly to the bottom of the tower, and the exhaust gas flows upwards through the packing layer. The purification chemical solution flows uniformly downwards from the top of the absorption tower through structured packing. Within the packing, the solution fully contacts and absorbs the specified gas and O2 from the waste gas. After absorbing the specified gas, the solution enters the desorption tower where, at high temperature, the corresponding gas captured in the saturated chemical solution is released – this is a reversible reaction. Simultaneously, the purification chemical solution reacts with some oxygen, resulting in a one-way chemical reaction – this is irreversible and will not release the gas in the desorption tower. The concentration of the purification chemical solution affects the circulation rate and the yield of the captured gas, but not the purity of the released gas. However, at the bottom of the absorption tower, the saturated chemical solution after passing through the structured packing is less likely to react with oxygen again. The saturated chemical solution at the bottom of the tower directly impacts the oxygen in the inlet waste gas, forming small bubbles. Oxygen adhering to the saturated chemical solution directly enters the desorption tower from the bottom, and is carried away by the desorbed gas. This results in a decrease in the purity of the gas captured in the discharge device. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes a gas capture device that meets the requirements of improving the high purity capture of a specified gas in the exhaust gas.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a gas capture device, comprising:

[0005] The tower body has an exhaust gas inlet on its side, a chemical purification solution inlet on its top, and a saturated solution outlet at its bottom.

[0006] The packing layer includes a structured packing layer fixedly disposed below the inlet of the purified chemical solution and a Pall ring packing layer fixedly disposed above the outlet of the saturated solution;

[0007] The liquid diversion assembly, disposed between the exhaust gas inlet and the structured packing layer, includes a central cylinder fixedly disposed within the tower body. Several air outlets are formed on the upper surface of the central cylinder. A guide plate is fixedly disposed at a certain distance above each air outlet. A liquid guiding groove is fixedly disposed between each air outlet. The liquid guiding groove has a multi-layer stepped structure. Several liquid guiding grooves are connected to a guide pipe disposed close to the tower body via trays. The output end of the guide pipe is in contact with the Pall ring packing layer.

[0008] Furthermore, the edge of the guide plate is located above the liquid guiding groove.

[0009] Furthermore, a support cylinder is fixedly installed above the air outlet. The support cylinder includes a first support cylinder and a second support cylinder arranged vertically. The first support cylinder is fixedly installed on the central cylinder based on the edge of the air outlet. The second support cylinder is fixedly connected to the guide plate facing the air outlet. The inner diameter of the first support cylinder is larger than the outer diameter of the second support cylinder. The lower end of the second support cylinder extends into the first support cylinder and is fixedly connected to the inner wall of the first support cylinder. Several air guide channels are opened at the connection.

[0010] Furthermore, the liquid guiding channel includes at least a first horizontal segment, at least a connecting segment, and a second horizontal segment. The two ends of the second horizontal segment are connected to the edges of the first horizontal segment by the connecting segment. The connecting segment can be either an arc segment or an inclined straight segment. The vertical projection of the edge of the guide plate is located above the first horizontal segment.

[0011] Furthermore, there are multiple liquid guiding channels, which are opened in parallel on the upper surface of the central cylinder. The tray is set on the edge of the upper surface of the central cylinder, and the two ends of the liquid guiding channels are connected to the tray.

[0012] Furthermore, the liquid diversion assembly is fixed between the exhaust gas inlet and the structured packing layer by a fixing plate, the diversion pipe is fixed between the inner wall of the tower body and the liquid diversion assembly by a fixing plate, and at least one liquid guide port is provided on the side of the tray facing the inner wall of the tower body.

[0013] Furthermore, the exhaust gas inlet is connected to the central cylinder, and an air intake pipe is fixedly installed in the central cylinder. The air intake pipe is connected and communicates with the exhaust gas inlet, and the lower surface of the air intake pipe is inclined upward in the direction away from the exhaust gas inlet.

[0014] Compared with the prior art, the beneficial effects of this utility model include:

[0015] 1) By setting up a liquid diversion component, the saturated chemical solution is buffered, reducing direct collisions between the saturated solution and the waste gas, and reducing the bubble content in the saturated solution. At the same time, the saturated solution flows through the Pall ring packing layer and collects at the bottom of the tower, improving the gas-liquid distribution performance. This allows small bubbles formed by oxygen and the saturated solution to move irregularly in the Pall ring packing layer. Small bubbles form large particles, and when the bubbles burst, oxygen escapes from the saturated solution. This makes it less likely for oxygen to be entrained by the saturated solution, ensuring that the saturated solution discharged from the outlet can release the specified gas with high purity. In addition, due to the multi-stage stepped liquid guide channel, the speed and direction of the saturated solution change due to the blocking and drafting effect of the stepped structure. This increases the contact area between the saturated solution and the air, while generating vortices and bubbles inside the saturated solution. This initially promotes the discharge of dissolved oxygen in the saturated solution, thereby reducing the dissolved oxygen content in the saturated solution.

[0016] 2) By installing a gradient tube-type air inlet pipe inside the central cylinder to guide the flow of waste gas entering the central cylinder, the horizontal conveying of waste gas is adjusted to vertical uniform gas delivery. This allows the waste gas to flow evenly into the liquid distribution component after entering the central cylinder and be output through the outlet. This avoids contact between the waste gas entering from the waste gas inlet and the saturated solution located at the bottom of the tower, and guides the flow of waste gas so that it can be absorbed by the purification chemical solution according to the set process before flowing to the bottom of the tower. This helps to better improve the purity of the gas collected by the collection device. Attached Figure Description

[0017] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0018] Figure 1 The schematic diagram shows a cross-sectional view of the gas trapping device;

[0019] Figure 2 The schematic diagram shows a magnified view of a local area A;

[0020] Figure 3 The schematic diagram shows a cross-sectional view of the first embodiment of the liquid guiding channel, wherein the connecting section is a straight inclined structure;

[0021] Figure 4 The schematic diagram shows a cross-sectional view of the second embodiment of the liquid guiding channel, wherein the connecting section is an arc structure.

[0022] The labels in the diagram are as follows: 1-Tower body, 2-Exhaust gas inlet, 3-Purification chemical solution inlet, 4-Saturated solution outlet, 5-Structured packing layer, 6-Pall ring packing layer, 7-Central cylinder, 8-Guide plate, 9-Liquid guide trough, 10-Tray, 11-Drain pipe, 12-First support cylinder, 13-Second support cylinder, 14-First horizontal section, 15-Connecting section, 16-Second horizontal section, 17-Inlet pipe. Detailed Implementation

[0023] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0024] Figure 1 The schematic diagram shows a cross-sectional view of a gas trapping device, such as... Figure 1 As shown, the system includes a tower body 1, a packing layer, and a liquid diversion assembly. Both the packing layer and the liquid diversion assembly are fixedly installed within the tower body 1. A waste gas inlet 2 is located on the side of the tower body 1, a chemical solution inlet 3 is located at the top of the tower body 1, and a saturated solution outlet 4 is located at the bottom of the tower body 1. The packing layer includes a structured packing layer 5 fixedly installed below the chemical solution inlet 3 and a Pall ring packing layer 6 fixedly installed above the saturated solution outlet 4. The aforementioned liquid diversion assembly is located between the waste gas inlet 2 and the structured packing layer 5, and includes a central cylinder 7 fixedly installed within the tower body 1. Several gas outlets are located on the upper surface of the central cylinder 7. A guide plate 8 is fixedly installed at a certain distance above each gas outlet, and a liquid guide trough 9 is fixedly installed between each gas outlet. The liquid guide trough 9 has a multi-layered stepped structure, and several liquid guide troughs 9 are connected to a guide pipe 11 located close to the tower body 1 via a tray 10. The output end of the guide pipe 11 contacts the Pall ring packing layer 6.

[0025] With the aforementioned liquid diversion component, after the exhaust gas is input into the tower body 1 from the exhaust gas inlet 2, it enters the upper region of the tower body 1 (i.e., the structured packing layer 5) through the gas outlet opened on the upper surface of the central cylinder 7. The structured packing layer 5 is located below the chemical solution inlet 3, and the chemical solution can flow out uniformly from the pore structure of the structured packing, thereby improving the mass transfer efficiency of the chemical solution.

[0026] Waste gas containing a specified gas and O2 that can be absorbed by the purifying chemical solution enters the gas collection device through waste gas inlet 2 and flows upward. Since the central cylinder 7 is connected to waste gas inlet 2, the waste gas flows upward from the outlet located above the central cylinder 7 and comes into contact with the purifying chemical solution in the structured packing layer 5. The purifying chemical solution absorbs the specified gas in the waste gas and transforms into a saturated solution, flowing along the guide plate 8 of the liquid diversion assembly to the guide channel, and then collecting in the guide channel 9. It is then diverted through the guide channel 9 to the tray 10, and subsequently flows through the drainage pipe 11 to the top of the Pall ring packing layer 6. The liquid diversion assembly acts as a buffer, reducing direct collisions between the saturated solution and the waste gas, and reducing the bubble content in the saturated solution. Meanwhile, the saturated solution flows through the Pall ring packing layer 6 and collects at the bottom of the tower, improving the gas and liquid distribution performance. This allows small bubbles formed by oxygen and the saturated solution to move irregularly in the Pall ring packing layer 6. The small bubbles form large particles, and when the bubbles burst, oxygen escapes from the saturated solution. This makes it less likely for oxygen to be entrained by the saturated solution, ensuring that the saturated solution discharged from the saturated solution outlet 4 can release the specified gas with high purity.

[0027] Figure 2 The schematic diagram shows a magnified view of a local area A, such as... Figure 2 As shown, the aforementioned guide plate 8 has an inverted cone structure. The edge of the guide plate 8 is located above the liquid guiding groove 9. The inverted cone structure of the guide plate 8 can increase the speed of the saturated solution flowing along the surface of the guide plate 8, accelerate the collection of the saturated solution in the liquid guiding groove 9, and the edge of the guide plate 8 being located above the liquid guiding groove 9 can effectively guide the saturated solution into the liquid guiding groove 9.

[0028] The following describes the specific method for fixing the guide plate 8. A support cylinder is fixedly installed above the aforementioned air outlet. The support cylinder includes a first support cylinder 12 and a second support cylinder 13 arranged vertically. The first support cylinder 12 is fixedly installed on the central cylinder 7 based on the edge of the air outlet, and the second support cylinder 13 is fixedly connected to the side of the guide plate 8 facing the air outlet. By fixing the first support cylinder 12 and the second support cylinder 13, the guide plate 8 can be fixedly installed at a certain distance above the air outlet. The inner diameter of the first support cylinder 12 is larger than the outer diameter of the second support cylinder 13, so that the second support cylinder 13 can extend into the first support cylinder 12. There is a gap between the inner wall of the first support cylinder 12 and the outer wall of the second support cylinder 13, so that the exhaust gas can be sent out through the gap. Therefore, the lower end of the second support cylinder 13 extends into the first support cylinder 12 and is fixedly connected to the inner wall of the first support cylinder 12. In order to ensure the output of exhaust gas, several air guide channels are opened at the connection between the first support cylinder 12 and the second support cylinder 13.

[0029] Figure 3 The schematic diagram shows a cross-sectional view of the first embodiment of the liquid guiding channel. Figure 4 The schematic diagram shows a cross-sectional view of the second embodiment of the liquid guiding groove, which is described below in conjunction with... Figure 3 as well as Figure 4 The liquid guiding channel 9 is described in detail below. The liquid guiding channel 9 includes at least one first horizontal segment 14, at least one connecting segment 15, and one second horizontal segment 16. The two ends of the second horizontal segment 16 are integrally connected to the edges of the first horizontal segment 14 via the connecting segment 15. The connecting segment 15 can be an arc segment (e.g., ...). Figure 4 (as shown) or sloping straight line segments (such as) Figure 3 In any of the following configurations, the vertical projection of the edge of the guide plate 8 is located above the first horizontal section 14; the second horizontal section 16 and the connecting section 15 constitute the collection space of the saturated solution. By setting the vertical projection of the edge of the guide plate 8 above the first horizontal section 14, when the saturated solution flows into the liquid guiding tank 9 under the action of the guide plate 8, it first falls on the first horizontal section 14, and then gradually flows through the connecting section 15 to the collection space below. During this flow process, due to the setting of the multi-stage stepped structure, the speed and direction of the saturated solution change due to the blocking and drafting effect of the stepped structure. This increases the contact area between the saturated solution and the air, while generating vortices and bubbles inside the saturated solution, initially promoting the discharge of dissolved oxygen dissolved in the saturated solution, thereby reducing the dissolved oxygen content in the saturated solution.

[0030] The aforementioned liquid guiding channels 9 are multiple, and these channels are parallel to each other on the upper surface of the central cylinder 7. The tray 10 is set on the edge of the upper surface of the central cylinder 7, and both ends of the liquid guiding channels 9 are connected to the tray 10. The depth of the tray 10 can be greater than the maximum depth of the liquid guiding channels 9, in order to ensure that the lowest point of the liquid guiding channel 9 and the lowest point of the tray 10 are not on the same plane. This prevents the saturated solution from flowing into the tray 10 and causing a certain degree of backflow due to the liquid guiding channels 9 and the lowest point of the tray 10 being on the same plane, thus affecting the flow of the saturated solution in the liquid guiding channels 9.

[0031] The aforementioned liquid diversion assembly is fixed between the exhaust gas inlet 2 and the structured packing layer 5 by a fixing plate. The guide pipe 11 is fixed between the inner wall of the tower body 1 and the liquid diversion assembly by a fixing plate. At least one liquid guide port is provided on the side of the tray 10 facing the inner wall of the tower body 1. The saturated solution can flow out from the tray 10 through the liquid guide port, and then flow from the guide pipe 11 into the Pall ring packing layer 6.

[0032] The aforementioned exhaust gas inlet 2 is connected to the central cylinder 7. In some embodiments, in order to enhance the guidance of the exhaust gas flow direction, an air inlet pipe 17 is fixedly installed in the central cylinder 7. The air inlet pipe 17 is connected and communicates with the exhaust gas inlet 2, and the lower surface of the air inlet pipe 17 is inclined upward in the direction away from the exhaust gas inlet 2. That is, in the direction away from the exhaust gas inlet 2, the height of the air inlet pipe 17 gradually decreases, and the air inlet pipe 17 is set as a tapered pipe structure. Since the exhaust gas inlet 2 is set on the side wall of the tower body 1, the exhaust gas is actually input laterally. After the exhaust gas enters the central cylinder 7 from the exhaust gas inlet 2, it impacts the inner wall of the central cylinder 7, and its flow direction is difficult to determine. Therefore, by adding an air inlet pipe 17, the lateral delivery of the exhaust gas can be adjusted to a vertical and uniform delivery, so that the exhaust gas can flow evenly into the liquid distribution component after entering the central cylinder 7 and be output through the air outlet. This avoids the exhaust gas input from the exhaust gas inlet 2 from contacting the saturated solution at the bottom of the tower body 1, and guides the flow direction of the exhaust gas, so that it can be absorbed by the purification chemical solution according to the set process and then flow to the bottom of the tower, which helps to better improve the purity of the gas collected by the collection device.

[0033] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A gas capture device, characterized in that, include: The tower body (1) has an exhaust gas inlet (2) on its side, a chemical purification solution inlet (3) on its top, and a saturated solution outlet (4) at its bottom. The packing layer includes a structured packing layer (5) fixedly disposed below the chemical solution inlet (3) and a Pall ring packing layer (6) fixedly disposed above the saturated solution outlet (4); The liquid diversion assembly is located between the exhaust gas inlet (2) and the structured packing layer (5). It includes a central cylinder (7) fixedly installed in the tower body (1). Several air outlets are provided on the upper surface of the central cylinder (7). A guide plate (8) is fixedly installed at a certain distance above each air outlet. A liquid guide groove (9) is fixedly installed between each air outlet. The liquid guide groove (9) has a multi-layer stepped structure. Several liquid guide grooves (9) are connected to the guide pipe (11) installed close to the tower body (1) by trays (10). The output end of the guide pipe (11) is in contact with the Pall ring packing layer (6).

2. The gas collection device according to claim 1, characterized in that, The guide plate (8) has an inverted cone structure, and the edge of the guide plate (8) is located above the liquid guiding groove (9).

3. The gas collection device according to claim 2, characterized in that, A support cylinder is fixedly installed above the air outlet. The support cylinder includes a first support cylinder (12) and a second support cylinder (13) arranged vertically. The first support cylinder (12) is fixedly installed on the center cylinder (7) based on the edge of the air outlet. The second support cylinder (13) is fixedly connected to the guide plate (8) facing the air outlet. The inner diameter of the first support cylinder (12) is larger than the outer diameter of the second support cylinder (13). The lower end of the second support cylinder (13) extends into the first support cylinder (12) and is fixedly connected to the inner wall of the first support cylinder (12). Several air guide channels are opened at the connection.

4. The gas collection device according to claim 2, characterized in that, The liquid guiding groove (9) includes at least a first horizontal section (14), at least a connecting section (15), and a second horizontal section (16). The two ends of the second horizontal section (16) are connected to the edges of the first horizontal section (14) by the connecting section (15). The connecting section (15) can be either an arc section or an inclined straight section. The vertical projection of the edge of the guide plate (8) is located above the first horizontal section (14).

5. The gas collection device according to claim 1, characterized in that, The liquid guiding groove (9) consists of multiple grooves, which are parallel to each other on the upper surface of the central cylinder (7). The tray (10) is set on the edge of the upper surface of the central cylinder (7), and the two ends of the liquid guiding groove (9) are connected to the tray (10).

6. The gas capture device according to claim 5, characterized in that, The liquid diversion assembly is fixed between the exhaust gas inlet (2) and the structured packing layer (5) by a fixing plate. The diversion pipe (11) is fixed between the inner wall of the tower body (1) and the liquid diversion assembly by a fixing plate. At least one liquid guide port is provided on the side of the tray (10) facing the inner wall of the tower body (1).

7. The gas collection device according to claim 1, characterized in that, The exhaust gas inlet (2) is connected to the central cylinder (7), and an air inlet pipe (17) is fixedly installed in the central cylinder (7). The air inlet pipe (17) is connected and communicates with the exhaust gas inlet (2), and the lower surface of the air inlet pipe (17) is inclined upward in the direction away from the exhaust gas inlet (2).

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