Gas absorption device

Abstract

The utility model provides a gas absorption device, which belongs to the technical field of chemical equipment and comprises a tower body as well as a demisting layer, an absorption layer and a liquid collection layer which are sequentially arranged in the tower body from top to bottom, the absorbing layer comprises a spraying layer, a filler layer and an atomizing layer which are sequentially arranged from top to bottom; the tower body is provided with a gas inlet corresponding to the atomizing layer; a plurality of layers of baffle plates are arranged on the liquid collecting layer, and liquid falling holes are formed in the baffle plates; the baffle plates sequentially divide the liquid collection layer into a third section, a second section, a first section and an extraction section from top to bottom, and the third section is provided with a third circulating pipe for guiding the absorption liquid into the atomization layer; the second section is provided with a second circulating pipe for guiding the absorption liquid into the filler layer; the first section is provided with a first circulating pipe for guiding the absorption liquid into the spraying layer; and an extraction pipe is arranged in the extraction region. According to the gas absorption device, the gas utilization rate is greatly increased, and then the problem that tail gas absorption treatment does not reach the standard can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and specifically relates to a gas absorption device. Background Art

[0002] In some wastewater treatment processes, including the absorption of tail gas, gas-liquid two-phase absorption reactions are often involved. However, in conventional absorption devices, there are often problems such as low gas utilization or incomplete tail gas absorption treatment, which leads to many problems such as wastewater treatment or gas emissions not meeting standards.

[0003] How to ensure complete reaction between gas and liquid phases and ensure that gas emissions meet emission standards has become an urgent problem that needs to be solved. Utility Model Content

[0004] The utility model provides a gas absorption device, which aims to solve the problems of low gas utilization and substandard tail gas absorption treatment in a gas-liquid two-phase reaction process.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a gas absorption device, comprising: a tower body and a demisting layer, an absorption layer and a liquid collecting layer arranged in the tower body from top to bottom; the absorption layer comprises a spraying layer, a packing layer and an atomizing layer arranged in sequence from top to bottom; the tower body is provided with a gas inlet corresponding to the atomizing layer;

[0006] The liquid collecting layer is provided with a plurality of baffles, and the baffles are provided with liquid drop holes; the baffles divide the liquid collecting layer into a third section, a second section, a first section and a production section from top to bottom in sequence; the third section is provided with a third circulation pipe for introducing the primary absorption liquid into the atomization layer, and the third circulation pipe is provided with a third circulation pump; the second section is provided with a second circulation pipe for introducing the secondary absorption liquid into the packing layer, and the second circulation pipe is provided with a second circulation pump; the first section is provided with a first circulation pipe for introducing the tertiary absorption liquid into the spraying layer, and the first circulation pipe is provided with a first circulation pump; the production section is provided with a production pipe, and the production pipe is provided with a production pump for producing the absorption liquid out of the tower body.

[0007] In one feasible manner, a first liquid distributor is arranged above the spray layer, and the first circulation pipe is connected to the first liquid distributor; a second liquid distributor is arranged above the packing layer, and the second circulation pipe is connected to the second liquid distributor; a third liquid distributor is arranged above the atomization layer, and the third circulation pipe is connected to the third liquid distributor.

[0008] In one achievable manner, the atomization layer is provided with a first gas distributor, which is located above the gas inlet and has a vertical distance of 20 cm-30 cm from the gas inlet and a vertical distance of 40 cm-60 cm from the third liquid distributor.

[0009] In one achievable manner, the packing layer is further provided with a second gas distributor, and the second gas distributor is located below the second liquid distributor, and the vertical distance between the second gas distributor and the second liquid distributor is 40 cm-60 cm.

[0010] In one achievable manner, a liquid-liquid mixer is further provided on the first circulation pipe, and a liquid alkali feed port is provided on the liquid-liquid mixer.

[0011] In one achievable manner, an online monitoring pH meter is also provided on the first circulation pipe.

[0012] In one feasible manner, the middle portion of the baffle protrudes upward to form a top plane, and horizontal support surfaces are formed on both sides of the top plane symmetrically. The horizontal support surfaces are parallel to the top plane and lower than the top plane, and a vertical plane is formed between the horizontal support surface and the top plane, and the downcomer hole is arranged on the vertical plane.

[0013] In a feasible manner, the distance between the two straight sides of the top plane and the inner wall of the tower body is 15 cm-25 cm.

[0014] In one achievable manner, the vertical distance between adjacent baffles is 50 cm-60 cm.

[0015] In one achievable manner, the distance between adjacent downcomers is 20 cm to 30 cm.

[0016] Compared with the prior art, the gas absorption device provided by the utility model has the beneficial effects of: comprising a liquid collection layer, an atomization layer, a packing layer, a spray layer, and a demisting layer arranged in sequence from bottom to top; wherein the liquid collection layer is divided into a first section, a second section, a third section, and a production section by a baffle, and the baffle is provided with a liquid drop hole. After the gas enters the tower body, the absorption liquid that completes the first absorption in the atomization layer falls into the third section; the first absorption liquid in the third section enters the second section through the corresponding downcomer holes on the baffle plate, and the secondary absorption liquid in the second section is introduced into the packing layer through the circulation pump, and reacts with the gas overflowing from the top of the atomization layer in the packing layer to complete the secondary absorption; the secondary absorption liquid in the second section enters the first section through the corresponding downcomer holes on the baffle plate, and the tertiary absorption liquid in the first section is introduced into the spray layer through the circulation pump, and completes the tertiary absorption in the spray layer and the gas overflowing from the top of the packing layer; the tertiary absorption liquid in the first section enters the extraction section through the corresponding downcomer holes on the baffle plate, and the absorption liquid in the extraction section is extracted from the tower body through the extraction pump, and the gas that has been absorbed three times finally passes through the demisting layer and overflows from the top of the self-absorption device.

[0017] The gas absorption device provided by the utility model, firstly, divides the liquid in the liquid collection layer into four different intervals by setting three layers of baffles in the liquid collection layer, and the absorption liquid is introduced into the corresponding absorption layer through the circulation pipe of each interval, which greatly increases the gas absorption effect; secondly, the pH value of the absorption liquid in the four intervals of the tower body presents a gradient distribution, and the flow path from the third interval to the extraction interval can be extended through the liquid downcomer on the baffle, thereby extending the contact residence time of the gas-liquid reaction, and further increasing the gas absorption effect. Therefore, the gas absorption device provided by the present application greatly improves the gas utilization rate, thereby improving the problem of substandard tail gas absorption treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a gas absorption device provided in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the structure of the baffle provided in the embodiment of the utility model;

[0020] Description of reference numerals:

[0021] 1. Production pump; 2. First circulation pump; 3. Second circulation pump; 4. Third circulation pump; 5. Gas inlet; 9. Demisting layer; 81. Liquid collecting layer; 51. Atomizing layer; 11. Production interval; 21. First interval; 31. Second interval; 41. Third interval; 61. Packing layer; 62. Second gas distributor; 71. Spraying layer; 22. Liquid-liquid mixer; 201. First liquid distributor; 301. Second liquid distributor; 401. Third liquid distributor; 501. First gas distributor; 202. Liquid alkali feed port; 801. Online pH meter; 811. Downcomer; 812. Baffle. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0024] Please also read Figure 1 and Figure 2 The gas absorption device provided by the utility model is now described. The gas absorption device comprises: a tower body and a demisting layer 9, an absorption layer and a liquid collection layer 81 arranged in sequence from top to bottom in the tower body; the absorption layer comprises a spray layer 71, a packing layer 61 and an atomization layer 51 arranged in sequence from top to bottom; the tower body is provided with a gas inlet 5 corresponding to the atomization layer 51; the liquid collection layer 81 is provided with a multi-layer baffle 812, and a liquid drop hole 811 is provided on the baffle 812; the baffle 812 divides the liquid collection layer 81 into a third interval 41, a second interval 31, and a first interval 2 from top to bottom. 1 and a production interval 11, the third interval 41 is provided with a third circulation pipe for introducing the absorption liquid into the atomization layer 51, and the third circulation pipe is provided with a third circulation pump 4; the second interval 31 is provided with a second circulation pipe for introducing the absorption liquid into the packing layer 61, and the second circulation pipe is provided with a second circulation pump 3, the first interval 21 is provided with a first circulation pipe for introducing the absorption liquid into the spray layer 71, and the first circulation pipe is provided with a first circulation pump 2; the production interval 11 is provided with a production pipe, and the production pipe is provided with a production pump 1 for extracting the absorption liquid out of the tower body.

[0025] The gas absorption device provided by the utility model includes a liquid collection layer 81, an atomization layer 51, a packing layer 61, a spray layer 71, and a demisting layer 9 arranged in sequence from bottom to top; wherein the liquid collection layer 81 is divided into a first interval 21, a second interval 31, a third interval 41, and a production interval 11 by a baffle 812, and a liquid drop hole 811 is provided on the baffle 812. After the gas enters the tower body from the gas inlet 5, the absorption liquid that completes the primary absorption in the atomization layer 51 falls into the third section 41; the primary absorption liquid in the third section 41 enters the second section 31 through the corresponding downcomer hole 811 on the baffle 812, and the secondary absorption liquid in the second section 31 is introduced into the packing layer 61 by a circulation pump, and reacts with the gas overflowing from the top of the atomization layer 51 in the packing layer 61 to complete the secondary absorption; the secondary absorption liquid in the second section 31 enters the first section 21 through the downcomer hole 811 on the corresponding baffle 812, and the tertiary absorption liquid in the first section 21 is introduced into the spray layer 71 by a circulation pump, and completes the tertiary absorption in the spray layer 71 with the gas overflowing from the top of the packing layer 61, and the gas absorbed tertiarily finally overflows from the top of the absorption device through the demisting layer 9; the tertiary absorption liquid in the first section 21 enters the extraction section 11 through the downcomer hole 811 on the corresponding baffle 812, and the absorption liquid in the extraction section 11 is discharged from the tower body by the extraction pump 1.

[0026] The gas absorption device provided by the utility model, firstly, by setting three layers of baffles 812 in the liquid collection layer 81, the liquid in the liquid collection layer 81 is divided into four different intervals, and the absorption liquid is introduced into the corresponding absorption layer through the circulation pipe of each interval, which greatly increases the gas absorption effect; secondly, the pH value of the absorption liquid in the four intervals of the tower body presents a gradient distribution, and the flow path from the third interval 41 to the production interval 11 can be extended through the liquid downcomer on the baffle 812, thereby extending the contact residence time of the gas-liquid reaction and further increasing the gas absorption effect. Therefore, the gas absorption device provided by the present application greatly improves the gas utilization rate, thereby improving the problem of substandard tail gas absorption treatment.

[0027] In some embodiments, see Figure 1 As shown, a first liquid distributor 201 is arranged above the spray layer 71, and the first circulation pipe is connected to the first liquid distributor 201; a second liquid distributor 301 is arranged above the packing layer 61, and the second circulation pipe is connected to the second liquid distributor 301; a third liquid distributor 401 is arranged above the atomization layer 51, and the third circulation pipe is connected to the third liquid distributor 401.

[0028] The primary absorption liquid of the third interval 41 is discharged through the third circulation pump 4 and transported to the third liquid distributor 401 through the first circulation pipe. After being evenly dispersed by the third liquid distributor 401, it completes the primary capture and absorption with the acid gas introduced from the gas inlet 5; the secondary absorption liquid of the second interval 31 is discharged through the second circulation pump 3 and transported to the second liquid distributor 301 through the second circulation pipe. After being evenly dispersed by the second liquid distributor 301, it completes the secondary capture and absorption with the acid gas overflowing from the top of the atomization layer 51; the tertiary absorption liquid of the first interval 21 is discharged through the first circulation pump 2 and transported to the first liquid distributor 201 through the first circulation pipe. After being evenly dispersed by the first liquid distributor 201, it completes the tertiary capture and absorption with the acid gas overflowing from the top of the packing layer 61. The acid gas that is not captured overflows from the top of the self-absorption device for emptying. After being distributed by the liquid distributors at various levels, the absorption liquid of each interval is evenly dispersed, which improves the effect of gas-liquid reaction.

[0029] In some embodiments, see Figure 1 As shown, the atomization layer 51 is provided with a first gas distributor 501 , which is located above the gas inlet 5 , and has a vertical distance of 20 cm-30 cm from the gas inlet 5 , and a vertical distance of 40 cm-60 cm from the third liquid distributor 401 .

[0030] The acidic gas entering the atomizing layer 51 through the gas inlet 5 is distributed by the first gas distributor 501 and then captured by the primary absorption liquid introduced from the third zone 41 above the first gas distributor 501. The unabsorbed acidic gas overflows from the third liquid distributor 401 above the atomizing layer 51 and enters the packing layer 61 above.

[0031] It should be noted that the first liquid distributor 201, the second liquid distributor 301, the third liquid distributor 401, the first gas distributor 501, the second gas distributor 62, including the packing layer 61 involved in the present invention are all conventional structures and will not be described in detail here.

[0032] In some embodiments, see Figure 1 As shown, the packing layer 61 is further provided with a second gas distributor 62 . The second gas distributor 62 is located below the second liquid distributor 301 , and the vertical distance between the second gas distributor 62 and the second liquid distributor 301 is 40 cm-60 cm.

[0033] The gas overflowing from the top of the atomizing layer 51 enters the packing layer 61, gradually rises inside the packing layer 61, and after being distributed by the second gas distributor 62, is captured by the secondary absorption liquid introduced from the second interval 31 above the second gas distributor 62. The unabsorbed acidic gas overflows from above the second liquid distributor 301 above the packing layer 61 and enters the spraying layer 71.

[0034] In some embodiments, see Figure 1 As shown, the first circulation pipe is also provided with a liquid-liquid mixer 22, and a liquid alkali feed port 202 is provided on the liquid-liquid mixer 22. The liquid alkali solution is introduced into the liquid-liquid mixer 22 from the liquid alkali feed port 202, and is mixed with the tertiary absorption liquid introduced into the first interval 21 inside the liquid-liquid mixer 22, and then introduced into the first liquid distributor 201. At this point, the absorption liquid after tertiary absorption is introduced above the spray layer 71, and the liquid alkali solution is added to the spray layer 71 through the liquid-liquid mixer 22, so that the pH value of the absorption liquid is always in a strong alkaline state, and then reacts with the gas overflowing from the top of the packing layer 61 for a tertiary time, thereby achieving thorough capture of the acidic gas, greatly improving the gas absorption efficiency, and avoiding the problem of escape of the unabsorbed gas.

[0035] In some embodiments, see Figure 1 As shown, the first circulation pipe is also provided with an online monitoring pH meter 801. The online monitoring pH meter 801 is located on the outlet pipeline of the liquid-liquid mixer 22, and can be used to monitor the pH value of the absorption liquid in the liquid collection layer 81 in real time, so that the pH value of the absorption liquid in the liquid collection layer 81 is guaranteed to be 11-13 in real time, so as to effectively ensure the effective capture and absorption of acidic gases, greatly improve the absorption efficiency of gases, and avoid the escape problem of unabsorbed gases.

[0036] In some embodiments, see Figure 1 and Figure 2 As shown, the middle part of the baffle 812 protrudes upward to form a top plane, and horizontal support surfaces are formed on both sides of the top plane symmetrically. The horizontal support surface is parallel to the top plane and lower than the top plane. A vertical plane is formed between the horizontal support surface and the top plane, and the downcomer 811 is arranged on the vertical plane. The baffle 812 is welded to the tower body through the edge of the horizontal support surface, and the baffle 812 can also be supported by a bracket on the inner wall of the tower body, and is connected by welding or bolts to ensure the stability and firmness of the device.

[0037] The present application sets up three layers of such baffles 812, which divide the liquid collection layer 81 into a third interval 41, a second interval 31, a first interval 21, and a production interval 11, forming a four-level capture and absorption state with a gradient distribution, extending the contact residence time of the gas-liquid reaction, further increasing the gas absorption effect, and greatly improving the gas utilization rate.

[0038] In some embodiments, see Figure 1 and Figure 2As shown, the distance between the two straight sides of the top plane and the inner wall of the tower body is 15cm-25cm, so as to form a space for the absorption liquid to move downward between the top plane and the inner wall of the tower body, so as to facilitate the absorption liquid to move from the downcomer hole 811 set on the vertical plane of the baffle 812 to the next interval. By setting the downcomer hole 811 on the vertical plane of the baffle 812 lower than the top plane, it is also beneficial to extend the flow path of the absorption liquid, thereby extending the reaction residence time of the gas and liquid in this interval, and effectively increasing the gas absorption effect.

[0039] In some embodiments, see Figure 1 and Figure 2 As shown, the vertical distance between adjacent baffles 812 is 50 cm to 60 cm. The distance between the two layers of baffles 812 is set to provide space for the absorption liquid to remain.

[0040] In some embodiments, see Figure 1 and Figure 2 As shown, the hole spacing between adjacent downcomers 811 is 20 cm to 30 cm. Three downcomers 811 arranged horizontally in a row are arranged on two vertical planes, and the diameter of the downcomers 811 is 8 cm to 10 cm.

[0041] The working principle of the gas absorption device provided by the utility model is as follows: the acid gas is introduced into the atomization layer 51 through the gas inlet 5, reacts with the absorption liquid on the surface of the third interval 41 to complete the primary capture and absorption, the acid gas that is not absorbed overflows from the top of the atomization layer 51 into the packing layer 61, reacts with the secondary absorption liquid introduced from the second interval 31 to complete the secondary capture and absorption, and the acid gas that is not captured and absorbed by the packing layer 61 overflows from the top of the packing layer 61 into the spray layer 71. The liquid alkali solution enters the liquid-liquid mixer 22 from the liquid alkali feed port 202, and is fully mixed with the tertiary absorption liquid introduced from the first interval 21 to form a strong alkali absorption liquid with a pH value of 11-13, enters the spray layer 71 through the first liquid distributor 201, reacts with the acid gas entering the spray layer 71 to complete the tertiary capture and absorption, and the acid gas that is not absorbed overflows through the tail gas discharge port at the top of the tower body.

[0042] At the same time, the primary absorption liquid that has completed one capture and absorption in the atomization layer 51 enters the second compartment 31 from the third compartment 41 through the downhole 811 on the baffle plate 812. The secondary absorption liquid that has completed the second capture and absorption in the second compartment 31 is circulated by the second circulation pump 3 and enters the first compartment 21 from the second compartment 31 through the downhole 811 on the baffle plate 812. The primary absorption liquid in the first compartment 21 is circulated by the first circulation pump 2 and mixed with the liquid alkali solution added into the tower body to complete the third capture. The tertiary absorption liquid that has been absorbed three times enters the production compartment 11 from the first compartment 21 through the downhole 811 on the baffle plate 812. The absorption liquid that has reached the absorption saturation state is discharged from the tower body through the production pump 1 from the production compartment 11.

[0043] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas absorption device, characterized in that: include: A tower body and a demisting layer (9), an absorption layer and a liquid collecting layer (81) arranged in sequence from top to bottom in the tower body; the absorption layer comprises a spraying layer (71), a packing layer (61) and an atomizing layer (51) arranged in sequence from top to bottom; the tower body is provided with a gas inlet (5) corresponding to the atomizing layer (51); The liquid collecting layer (81) is provided with a plurality of baffles (812), and the baffles (812) are provided with liquid drop holes (811); the baffles (812) divide the liquid collecting layer (81) into a third section (41), a second section (31), a first section (21) and a production section (11) from top to bottom in sequence; the third section (41) is provided with a third circulation pipe for introducing primary absorption liquid into the atomization layer (51), and the third circulation pipe is provided with a third circulation pump (4); the second section (31) is provided with a second circulation pipe for introducing secondary absorption liquid into the packing layer (61), and the second circulation pipe is provided with a second circulation pump (3); the first section (21) is provided with a first circulation pipe for introducing tertiary absorption liquid into the spraying layer (71), and the first circulation pipe is provided with a first circulation pump (2); the production section (11) is provided with a production pipe, and the production pipe is provided with a production pump (1) for producing absorption liquid out of the tower body.

2. The gas absorption device according to claim 1, characterized in that: A first liquid distributor (201) is arranged above the spray layer (71), and the first circulation pipe is connected to the first liquid distributor (201); a second liquid distributor (301) is arranged above the packing layer (61), and the second circulation pipe is connected to the second liquid distributor (301); a third liquid distributor (401) is arranged above the atomization layer (51), and the third circulation pipe is connected to the third liquid distributor (401).

3. The gas absorption device according to claim 2, characterized in that: The atomization layer (51) is provided with a first gas distributor (501), which is located above the gas inlet (5) and has a vertical distance of 20cm-30cm from the gas inlet (5) and a vertical distance of 40cm-60cm from the third liquid distributor (401).

4. The gas absorption device according to claim 2, characterized in that: The packing layer (61) is further provided with a second gas distributor (62), and the second gas distributor (62) is located below the second liquid distributor (301), and the vertical distance between the second gas distributor (62) and the second liquid distributor (301) is 40 cm-60 cm.

5. The gas absorption device according to claim 1, characterized in that: The first circulation pipe is also provided with a liquid-liquid mixer (22), and the liquid-liquid mixer (22) is provided with a liquid alkali feed port (202).

6. The gas absorption device according to claim 5, characterized in that: The first circulation pipe is also provided with an online monitoring pH meter (801).

7. The gas absorption device according to claim 1, characterized in that: The middle portion of the baffle (812) protrudes upward to form a top plane, and horizontal support surfaces are formed on two symmetrical sides of the top plane. The horizontal support surfaces are parallel to the top plane and lower than the top plane. A vertical plane is formed between the horizontal support surface and the top plane, and the downcomer (811) is arranged on the vertical plane.

8. The gas absorption device according to claim 7, characterized in that: The distances between the two straight sides of the top plane and the inner wall of the tower body are both 15 cm-25 cm.

9. The gas absorption device according to claim 7, characterized in that: The vertical distance between adjacent baffles (812) is 50cm-60cm.

10. The gas absorption device according to claim 7, characterized in that: The distance between adjacent downcomers (811) is 20cm-30cm.

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