A gas absorption device with venturi mixing internals

Abstract

The application discloses a gas absorption device with Venturi mixing inner parts and belongs to the technical field of gas treatment equipment. The device comprises a cylinder, an upper head connected to the upper end of the cylinder and a lower head connected to the lower end of the cylinder, the upper part of the upper head is connected with an exhaust pipe, the lower part of the lower head is connected with a liquid discharge pipe, the upper part of the cylinder below the upper head is connected with a liquid inlet pipe, the upper part of the cylinder above the lower head is connected with a gas inlet pipe, a Venturi mixing inner part is arranged in the upper part of the cylinder, a back mixing inner part is arranged above the Venturi mixing inner part, the back mixing inner part is installed on the inner wall of the cylinder, a baffle is arranged on the inner wall of the cylinder between the back mixing inner part and the liquid inlet pipe, and a demisting mechanism is further installed on the inner wall of the cylinder. The Venturi mixing inner part and the back mixing inner part arranged in the device can make the liquid phase form micro-bubbles to contact the gas when the gas and the liquid contact at the lower part of the device, the back mixing is enhanced, the mass transfer coefficient is increased, and the residence time of the gas and the liquid is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas treatment equipment, and particularly relates to a gas absorption device with a Venturi mixing inner part. BACKGROUND

[0002] With the deterioration of raw material quality in the petroleum and chemical industry, the storage medium contains sulfur compounds, nitrogen compounds and fine particles. In the production process of petroleum and chemical industry, a large amount of toxic gas will inevitably be produced. These toxic and harmful substances are not only harmful to human health, but also cause serious damage to the ecological environment. Therefore, a gas absorption device is needed to treat the generated toxic and harmful gas and ensure the operation of the production process.

[0003] The existing gas treatment device is usually a plate tower structure. The absorption tower with this structure usually causes the waste liquid at the bottom to be difficult to drain. In addition, the absorption tower is usually very high and unstable. In windy weather, the absorption tower may shake, which is not safe. In addition, the mass transfer efficiency of the existing absorption tower is difficult to improve, and the gas-liquid two-phase contact is not sufficient. The whole device has a large pressure drop and a large energy loss.

[0004] In the prior art, patent documents CN110449014B, CN111450719B and CN104826459B all disclose a treatment device containing a Venturi structure, but there is still a problem of complex structure.

[0005] Therefore, the application provides a gas absorption device with a Venturi mixing inner part. SUMMARY

[0006] In view of the deficiencies of the prior art, the application aims to provide a gas absorption device with a Venturi mixing inner part, which purifies sulfur tail gas, circulating gas, natural gas, carbon dioxide and other gases, generates a large number of uniform micro-bubbles in the gas absorption device through the mixing inner part of the Venturi tube structure, improves the phase contact specific surface area, maintains the stability of the bed layer, and strengthens the mass transfer by setting the back-mixing inner part, so as to solve the problems of low mass transfer efficiency and insufficient gas-liquid two-phase contact in the gas absorption process, and greatly reduce the device size and cost.

[0007] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0008] The application discloses a gas absorption device with Venturi mixing inner parts, which comprises a cylinder, an upper head connected to the upper end of the cylinder and a lower head connected to the lower end of the cylinder, an exhaust pipe connected to the upper part of the upper head, a liquid inlet pipe connected to the upper part of the cylinder below the upper head, a gas inlet pipe connected to the lower part of the cylinder above the lower head, a Venturi mixing inner part arranged in the cylinder above the gas inlet pipe, a back mixing inner part connected to the upper part of the Venturi mixing inner part, the back mixing inner part being installed on the inner wall of the cylinder, a baffle plate arranged on the inner wall of the cylinder between the back mixing inner part and the liquid inlet pipe, and a defoaming mechanism installed on the inner wall of the cylinder.

[0009] As a preferred technical scheme of the application, the liquid inlet pipe is located 150-300 mm below the upper head.

[0010] As a preferred technical scheme of the application, the distance between the lowermost end of the Venturi mixing inner part and the gas inlet pipe is 100-500 mm.

[0011] As a preferred technical scheme of the application, the back mixing inner part comprises an inner cylinder and a sieve plate and a distribution disc installed on the inner wall of the inner cylinder from top to bottom.

[0012] As a preferred technical scheme of the application, the diameter of the inner cylinder is smaller than the diameter of the cylinder, and the height of the inner cylinder is 500-1500 mm.

[0013] As a preferred technical scheme of the application, the distance between the outer wall of the inner cylinder and the inner wall of the cylinder is 100-200 mm.

[0014] As a preferred technical scheme of the application, a through hole is formed in the distribution disc, and a tubular distributor is arranged in the through hole.

[0015] As a preferred technical scheme of the application, a strip-shaped grid is formed in the sieve plate.

[0016] As a preferred technical scheme of the application, the Venturi mixing inner part comprises a gas collecting port, a conical cavity, a necked section, a mixing core, a mixing expansion port and a connecting leg, the connecting leg is connected to the bottom of the back mixing inner part, the mixing expansion port is connected below the connecting leg, the bottom of the mixing expansion port is connected to a cavity structure, the cavity structure is provided with the necked section communicated with the bottom of the mixing expansion port, the cavity structure is also provided with the conical cavity communicated with the bottom of the necked section, the bottom of the cavity structure is connected to the outwardly expanded gas collecting port, and the mixing core is filled in the necked section.

[0017] As a preferred technical scheme of the application, the mixing core is regular packing and is made of stainless steel.

[0018] As a preferred technical scheme of the present application, the number of the connecting legs is not less than 3.

[0019] As a preferred technical scheme of the present application, the end of the liquid inlet pipe located in the cylinder is provided with a liquid suction nozzle.

[0020] As a preferred technical scheme of the present application, the end of the gas inlet pipe located in the cylinder is provided with a bubble diffuser.

[0021] As a preferred technical scheme of the present application, the defoaming mechanism is a wire mesh structure, including an upper defoamer, a middle defoamer and a lower defoamer.

[0022] As a preferred technical scheme of the present application, the upper defoamer is located above the liquid inlet pipe, the wire mesh aperture of the upper defoamer is 1-5 mm, the wire diameter is 0.5-2 mm, and the thickness is 50-100 mm.

[0023] As a preferred technical scheme of the present application, the middle defoamer is located between the liquid inlet pipe and the baffle, the wire mesh aperture of the middle defoamer is 1-5 mm, the wire diameter is 0.5-2 mm, and the thickness is 100-200 mm.

[0024] As a preferred technical scheme of the present application, the lower defoamer is located below the gas inlet pipe, the wire mesh aperture of the lower defoamer is 2-8 mm, the wire diameter is 0.5-2 mm, and the thickness is 100-200 mm.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] (1) The gas absorption device with Venturi mixing inner part provided by the present application is internally provided with a Venturi mixing inner part and a back mixing inner part, which jointly act to make the liquid phase form micro-bubbles to contact when the gas and liquid are contacted in the lower part of the device, to enhance back mixing, increase the mass transfer coefficient, and increase the residence time of the gas and liquid phases.

[0027] (2) The device provided by the present application does not need a large number of tray structures and other components, realizes the transformation of the gas absorption plate type tower into a new type of reactor, simplifies the structure of the device, improves the space utilization, saves the cost, reduces the pressure drop of the whole device, reduces the energy loss, and improves the safety of the device.

[0028] (3) The Venturi mixing inner part provided by the present application has a simple structure and is compact and not easy to be damaged. The degree of gas-liquid turbulence in the device is increased, the mass transfer coefficient is improved, and the mass transfer efficiency is improved.

[0029] (4) The gas absorption device with Venturi mixing inner part provided by the application can reasonably utilize the space of the device and improve the mass transfer efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Figure 1 is a structural schematic diagram of the gas absorption device of the application;

[0031] Figure 2 Figure 5 is a structural schematic diagram of the return mixing inner part of the application;

[0032] Figure 3 Figure 6 is a structural schematic diagram of the A-A section of the return mixing inner part of the application;

[0033] Figure 4 Figure 7 is a structural schematic diagram of the B-B section of the return mixing inner part of the application;

[0034] Figure 5 Figure 8 is a structural schematic diagram of the Venturi mixing inner part of the application;

[0035] Figure 6 Figure 9 is a top view of the absorption liquid spray head of the application;

[0036] Figure 7 Figure 10 is a side view of the absorption liquid spray head of the application.

[0037] 1, exhaust pipe; 2, upper demister; 3, liquid inlet pipe; 4, middle demister; 5, return mixing inner part; 510, distribution disc; 520, sieve plate; 530, inner cylinder; 6, gas inlet pipe; 7, lower demister; 8, liquid outlet pipe; 9, bubble diffuser; 10, absorption liquid spray head; 101, water spray plate; 102, water spray port; 11, baffle; 12, Venturi mixing inner part; 121, gas collection port; 122, conical cavity; 123, necked section; 124, mixing core; 125, mixing and expanding port; 126, connecting leg. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the application will be apparently and completely described below in conjunction with the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0039] Reference Signs List Figures 1-7The gas absorption device with Venturi mixing inner part comprises a cylinder, an upper head connected to the upper end of the cylinder, and a lower head connected to the lower end of the cylinder, the upper part of the upper head is connected with an exhaust pipe 1, the lower part of the lower head is connected with a liquid discharge pipe 8, the upper part of the cylinder below the upper head is connected with a liquid inlet pipe 3, and the upper part of the cylinder above the lower head is connected with a gas inlet pipe 6; a Venturi mixing inner part 12 is arranged in the cylinder above the gas inlet pipe 6, and a back mixing inner part 5 is arranged above the Venturi mixing inner part 12; the back mixing inner part 5 is installed on the inner wall of the cylinder, and a baffle 11 is arranged on the inner wall of the cylinder between the back mixing inner part 5 and the liquid inlet pipe 3; a defoaming mechanism is further installed on the inner wall of the cylinder.

[0040] In the technical scheme, the gas absorption device is used for absorbing a certain substance in gas, and the absorption liquid flowing into the device is determined according to different gases to be treated. Specifically, the gas absorption device comprises a cylinder, an upper head connected to the upper end of the cylinder, and a lower head connected to the lower end of the cylinder, and the cylinder, the upper head and the lower head jointly form a reaction chamber for gas absorption. The top of the upper head is provided with an exhaust pipe 1 for discharging clean gas formed after the gas is treated by absorption, and the bottom of the lower head is provided with a liquid discharge pipe 8 for discharging rich liquid after absorption. The reaction chamber has an absorption liquid area, the absorption liquid area has a gas bubble diffuser 9 connected with the gas inlet pipe 6, a Venturi mixing inner part 12 is arranged above the gas bubble diffuser 9, a back mixing inner part 5 is arranged above the Venturi mixing inner part 12, and a baffle 11 and an absorption liquid nozzle 10 connected with the liquid inlet pipe 3 are arranged above the absorption liquid area.

[0041] In the technical scheme, the cylinder of the gas absorption device is provided with a gas inlet (not shown in the figure) and a liquid inlet (not shown in the figure), the liquid inlet is arranged close to the upper head and 150-300 mm below the upper head, the liquid inlet pipe 3 extends into the center of the device vertically through the liquid inlet, and the absorption liquid nozzle 10 is connected to the liquid outlet end of the liquid inlet pipe 3. Further referring to Figure 6 and Figure 7 The absorption liquid nozzle 10 comprises a water spraying plate 101 and a plurality of water spraying holes 102 arranged on the water spraying plate 101; the angle between the water spraying holes 102 and the horizontal direction is 40-50°; the angle is preferably 45°; the cross section of the water spraying plate 101 is circular, the plurality of water spraying holes 102 are arranged on the lower surface of the water spraying plate 101, the plurality of water spraying holes 102 form a circular water spraying array on the water spraying plate 101, the circular water spraying array is concentrically distributed with the water spraying plate 101, and the circular water spraying array has a plurality of circular water spraying arrays. Of course, it can be understood that the absorption liquid nozzle 10 can also select the conventional structure in the prior art.

[0042] In some embodiments, the gas inlet pipe 6 enters the device interior perpendicularly to the device sidewall and is bent 90° upward at the center of the device interior. The end of the gas inlet pipe 6 is provided with a bubble diffuser 9, and above the bubble diffuser 9 is a Venturi mixing inner part 12. The bubble diffuser 9 is made of a porous material, and its shape can be selected as a pipe, a hemisphere, a disc, etc. according to requirements, and is preferably a sphere or a hemisphere to increase the surface area and make the gas more uniformly distributed. The connection between the bubble diffuser 9 and the gas inlet pipe 6 can be in the form of bolt connection, flange connection, etc. The bubble diffuser 9 is made of 316 stainless steel. After passing through the bubble diffuser 9, the gas to be treated forms a large number of bubbles in the absorption liquid. The bubble diffuser in the device can also use the prior art, and can refer to the Chinese invention patent No. 201410081189.1, entitled "Micro-bubble generator for enhanced hydrogenation process".

[0043] In some embodiments, further referring to Figure 5 , the Venturi mixing inner part 12 comprises a gas collecting port 121, a tapered cavity 122, a necked section 123, a mixing core 124, a mixing expansion port 125, and a connecting leg 126. The connecting leg 126 is connected to the bottom of the back-mixing inner part 5. The mixing expansion port 125 is connected below the connecting leg 126. The bottom of the mixing expansion port 125 is connected to a cavity structure, the cavity structure is provided with the necked section 123 which is connected to the bottom of the mixing expansion port 125, and the cavity structure is also provided with the tapered cavity 122 which is connected to the bottom of the necked section 123. The bottom of the cavity structure is connected to the outwardly expanded gas collecting port 121. The mixing core 124 is filled in the necked section 123. In the above technical solution, the Venturi mixing inner part 12 is provided with the mixing core 124 at the thinnest part. The gas phase from the gas inlet pipe 6 enters the tapered cavity 122 inside the Venturi mixing inner part 12 through the gas collecting port 121, and the gas-liquid phase is compressed and broken in the necked section 123 through the Venturi structure. The mixing core 124 is located at the necked section of the Venturi mixing inner part, and the mixing core 124 is made of stainless steel and has a regular metal packing structure. After passing through the mixing core 124 in the necked section, the bubbles are further broken and dispersed through the pressure change in the mixing expansion port 125, and then leave the Venturi mixing inner part. The Venturi mixing inner part 12 is connected to the cylindrical back-mixing inner part above it through the connecting leg 126. The number of connecting legs is at least 3, and can be 3, 4, 5, 6, etc. It can be understood that the gas collecting port 121 is a horn-shaped port, the tapered cavity 122 is tapered from bottom to top along the gas flow direction, and the mixing expansion port 125 is expanded from bottom to top along the gas flow direction. The bubbles of the gas to be treated are quickly reacted and absorbed in the absorption liquid zone, and the bubbles float to the back-mixing inner part 5 in the absorption liquid zone. In some embodiments, the distance between the lowermost end of the Venturi mixing inner part 12 and the gas inlet pipe 6 is 100-500 mm.

[0044] In some embodiments, further referring to Figures 2-4 The back-mixing inner part 5 is composed of a distribution plate 510, a sieve plate 520 and an inner cylinder 530. The distribution plate 510 and the sieve plate 520 are arranged inside the inner cylinder 530 from bottom to top, i.e. the distribution plate 510 is below the sieve plate 520, and the two are arranged in parallel. The outer diameter of the inner cylinder 530 is slightly smaller than the inner diameter of the device cylinder, specifically, the interval between the outer wall of the inner cylinder 530 and the inner wall of the device is 100-200 mm, which can be 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc. The height of the inner cylinder 530 is 500-1500 mm; preferably, the height of the inner cylinder 530 can be 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, 1300 mm, 1400 mm, 1500 mm, etc. It needs to be particularly emphasized that the back-mixing inner part 5 is installed on the inner wall of the device, which can be connected and installed on the inner wall of the device by relying on the structure of the side of the distribution plate 510 extending out, or can be connected and installed on the inner wall of the device by relying on the structure of the side of the sieve plate 520 extending out, and the extending structure can be a common inner part installation structure form, which is not described and limited in the present application, and it is a conventional technical means possessed by those skilled in the art.

[0045] In some embodiments, uniform through holes are opened on the distribution plate 510, and there are tubular distributors in the through holes. The sieve plate 520 is a strip-shaped grid. Specifically, the distribution plate 510 in the back-mixing inner part stabilizes a large number of bubbles in the absorption liquid. The bubbles enter the back-mixing inner part 5 from the distribution pipe in the distribution plate 510, and the sieve plate 520 is also arranged in the back-mixing inner part 5 to stabilize the gas-liquid two-phase passing through the back-mixing inner part. The distribution plate 510 and the sieve plate 520 are arranged in the inner cylinder 530. Due to the effect of the gas pushing from bottom to top, the liquid in the absorption liquid layer will form a back-mixing flow in the inner cylinder and the outer cylinder, and the absorption liquid in the inner cylinder 530 will flow back through the gap between the inner cylinder and the device cylinder wall to form a back-mixing area at the entire back-mixing inner part. After the micro-bubbles escape from the absorption liquid area, the continuous phase gas moves to the upper part of the device and contacts the absorption liquid droplets falling from the upper liquid inlet pipe 3 and the absorption liquid nozzle 10 on the baffle 11, further absorbing the gas to be treated components, and the finally treated clean gas leaves from the exhaust pipe 1 at the top of the device to realize the gas treatment process. It can be understood that the number of back-mixing inner parts 5 can be one group or multiple groups, which can be flexibly selected according to actual needs.

[0046] In some embodiments, a defoaming mechanism is arranged in the device, which includes an upper defoamer 2 arranged above the liquid inlet pipe 3, a middle defoamer 4 arranged between the liquid inlet pipe 3 and the baffle 11, and a lower defoamer 7 arranged below the gas inlet pipe 5. The defoaming mechanism is a wire mesh structure arranged transversely in the reaction tower. The wire mesh of the upper defoamer 2 has a pore size of 1-5 mm, a wire diameter of 0.5-2 mm, and a thickness of 50-100 mm. It can be understood that the wire mesh of the upper defoamer 2 can have a pore size of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., a wire diameter of 0.5 mm, 1 mm, 1.5 mm, 2 mm, and a thickness of 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, etc. The upper defoamer 2 is used to remove the foam in the gas phase entering the exhaust pipe 1, so as to ensure that the gas discharged from the device is relatively pure.

[0047] The wire mesh of the middle defoamer 4 has a pore size of 1-5 mm, a wire diameter of 0.5-2 mm, and a thickness of 100-200 mm. It can be understood that the wire mesh of the middle defoamer 4 can have a pore size of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., a wire diameter of 0.5 mm, 1 mm, 1.5 mm, 2 mm, and a thickness of 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc. The middle defoamer 4 can eliminate the foam entrained in the upward moving gas phase in the device, so as to prevent the influence on the spraying effect of the liquid phase inlet.

[0048] The wire mesh of the lower defoamer 7 has a pore size of 2-8 mm, a wire diameter of 0.5-2 mm, and a thickness of 100-200 mm. It can be understood that the wire mesh of the lower defoamer 7 can have a pore size of 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, a wire diameter of 0.5 mm, 1 mm, 1.5 mm, 2 mm, and a thickness of 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, etc. The lower defoamer 7 is arranged inside the lower head of the device, and can eliminate the foam in the liquid phase leaving from the bottom of the device.

[0049] Further referring to Figures 1-7 The operation process of the gas absorption device of the present application is described in detail as follows:

[0050] S1, turn on the absorption liquid nozzle 10 to introduce a certain amount of absorption liquid into the device, and accumulate a certain liquid layer in the device to form an absorption liquid zone. The liquid level of the absorption liquid zone is higher than the backmixing inner part 5, and the specific height is 200 mm above the uppermost backmixing inner part to the defoamer 4.

[0051] S2: open the valve of the inlet pipe 5, the gas enters the gas absorption device through the inlet pipe 6 and the gas diffuser 9, the gas forms a bubble flow in the absorption liquid zone at the lower part of the device through the venturi return mixing inner part 12, the gas and liquid phases contact each other to perform the first reaction of the gas absorption treatment, the gas bubbles of the gas to be treated move upward due to the factor of buoyancy; then the gas phase moves upward through the return mixing inner part 5 in the absorption liquid;

[0052] S3: after the gas leaving the absorption liquid zone, the continuous phase gas continues to rise, at this time, the absorption liquid sprayed by the absorption liquid nozzle 10 sprays downward in the continuous phase gas, and the continuous gas phase is in countercurrent contact, and the gas is subjected to secondary reaction;

[0053] S4: the gas after the secondary reaction passes through the upper demister 2 and leaves the device from the exhaust pipe 1 at the top of the device, enters the subsequent process, and the absorption liquid is discharged from the liquid discharge pipe 8 at the bottom of the device.

[0054] Obviously, the gas absorption device provided by the present application has the following specific features:

[0055] The present application uses two different forms of gas-liquid two-phase mass transfer process, in the absorption liquid zone at the lower part of the device, the concentration of the components to be absorbed in the gas is the highest, the gas to be absorbed exists in the form of a large number of bubbles in the absorption liquid, the absorption liquid is the continuous phase, and the gas is the dispersed phase, the contact area between the gas and the absorption liquid is large, the mass transfer efficiency is high, the gas and the absorption liquid are subjected to primary reaction, and the components to be absorbed in the gas are rapidly reacted; the venturi mixing inner part is arranged in the absorption liquid zone, a large number of micro-bubbles are generated in the absorption liquid zone, the phase contact mass transfer efficiency is increased, and the turbulence degree is improved; at the same time, the return mixing inner part is increased in the absorption liquid zone, the residence time of the micro-bubbles is increased; at the upper part of the device, the absorption liquid droplets are sprayed by the absorption liquid nozzle 10, and the continuous gas phase is further absorbed, at this time, the components to be treated are subjected to secondary reaction.

[0056] In addition, the gas entering the device contains a high concentration of components to be treated, which is reacted and absorbed by the absorption liquid in the absorption liquid zone, after the gas escapes from the absorption liquid zone, the content of the components to be treated has been reduced, and the absorption liquid droplets are used for reaction and absorption. Therefore, the present application fully absorbs a certain component in the gas, improves the mass transfer efficiency, and reasonably utilizes the space of the device. Compared with the plate tower structure in the prior art, the structure of the device is simplified, and the operation residence time pressure is reduced.

[0057] At the same time, the venturi mixing inner part is arranged, the bubbles entering the device form micro-bubbles through the simple venturi structure, the venturi mixing inner part is combined with the return mixing inner part, the gas-liquid phase contact time is increased, the turbulence degree is increased, the mass transfer coefficient is improved, the mass transfer is more sufficient, and the sulfur tail gas, the circulating gas, the natural gas, the carbon dioxide and other gases can be efficiently purified.

[0058] The gas absorption device with Venturi mixing inner part of the present application is further described below in combination with specific embodiments.

[0059] Embodiment 1

[0060] The gas absorption device with Venturi mixing inner part comprises a cylinder, an upper head connected to the upper end of the cylinder and a lower head connected to the lower end of the cylinder, an exhaust pipe 1 connected to the upper part of the upper head, a liquid discharge pipe 8 connected to the lower part of the lower head, a liquid inlet pipe 3 connected to the upper part of the cylinder below the upper head, a gas inlet pipe 6 connected to the upper part of the cylinder above the lower head; a Venturi mixing inner part 12 arranged in the cylinder above the gas inlet pipe 6, a return mixing inner part 5 arranged above the Venturi mixing inner part 12; the return mixing inner part 5 is installed on the inner wall of the cylinder, and a baffle 11 is arranged on the inner wall of the cylinder between the return mixing inner part 5 and the liquid inlet pipe 3; a defoaming mechanism is also installed on the inner wall of the cylinder.

[0061] In this embodiment, the liquid inlet pipe 3 is located 250 mm below the upper head.

[0062] In this embodiment, the distance between the lowermost end of the Venturi mixing inner part 12 and the gas inlet pipe 6 is 350 mm.

[0063] In this embodiment, the return mixing inner part 5 comprises an inner cylinder 530 and a sieve plate 520 and a distribution disc 510 installed on the inner wall of the inner cylinder 530 from top to bottom.

[0064] In this embodiment, the diameter of the inner cylinder 530 is smaller than the diameter of the cylinder; the height of the inner cylinder 530 is 800 mm.

[0065] In this embodiment, the distance between the outer wall of the inner cylinder 530 and the inner wall of the cylinder is 100 mm.

[0066] In this embodiment, the distribution disc 510 is provided with through holes, and the through holes are provided with tubular distributors.

[0067] In this embodiment, the sieve plate 520 is provided with strip-shaped grids.

[0068] In this embodiment, the return mixing inner part 5 is provided as one group.

[0069] In the embodiment, the Venturi mixing inner part 12 comprises a gas collecting port 121, a conical cavity 122, a necked section 123, a mixing core 124, a mixing expansion port 125, and a connecting leg 126; the connecting leg 126 is connected with the bottom of the back-mixing inner part 5; the mixing expansion port 125 is connected below the connecting leg 126; the bottom of the mixing expansion port 125 is connected with a cavity structure, the cavity structure is provided with the necked section 123 communicated with the bottom of the mixing expansion port 125, and the cavity structure is also provided with the conical cavity 122 communicated with the bottom of the necked section 123; the bottom of the cavity structure is connected with the outwardly expanded gas collecting port 121; the mixing core 124 is filled in the necked section 123.

[0070] In the embodiment, the mixing core 124 is a structured packing, and the material is stainless steel.

[0071] In the embodiment, the number of the connecting legs 126 is three, and they are uniformly distributed.

[0072] In the embodiment, the end of the liquid inlet pipe 3 located in the cylinder is provided with a liquid absorbing nozzle 10.

[0073] In the embodiment, the end of the gas inlet pipe 6 located in the cylinder is provided with a bubble diffuser 9.

[0074] In the embodiment, the defoaming mechanism is a wire mesh structure, comprising an upper defoamer 2, a middle defoamer 4, and a lower defoamer 7; the upper defoamer 2 is located above the liquid inlet pipe 3, the wire mesh aperture of the upper defoamer 2 is 1mm, the wire diameter is 1mm, and the thickness is 80mm; the middle defoamer 4 is located between the liquid inlet pipe 3 and the baffle 11, the wire mesh aperture of the middle defoamer 4 is 2mm, the wire diameter is 1mm, and the thickness is 120mm; the lower defoamer 7 is located below the gas inlet pipe 6, the wire mesh aperture of the lower defoamer 7 is 3mm, the wire diameter is 1mm, and the thickness is 150mm.

[0075] The technical concept of the present application is illustrated by the above embodiments, but the present application is not limited to the above embodiments, that is, it does not mean that the present application must rely on the above embodiments to be implemented. It should be understood by those skilled in the art that any improvement of the present application, equivalent replacement of individual raw materials of the present application product, addition of auxiliary ingredients, selection of specific methods, etc. fall within the protection scope and disclosure scope of the present application.

Claims

1. A gas absorption apparatus with venturi mixing internals, comprising a cylinder, an upper head connected to an upper end of the cylinder, and a lower head connected to a lower end of the cylinder, characterized in that, The upper end of the upper head is connected with an exhaust pipe (1), the lower end of the lower head is connected with a liquid discharge pipe (8), the cylinder below the upper head is connected with a liquid inlet pipe (3), and the cylinder above the lower head is connected with an air inlet pipe (6); a Venturi mixing inner part (12) is arranged in the cylinder above the air inlet pipe (6), and a return mixing inner part (5) is arranged above the Venturi mixing inner part (12); the return mixing inner part (5) is installed on the inner wall of the cylinder, and a baffle (11) is arranged on the inner wall of the cylinder between the return mixing inner part (5) and the liquid inlet pipe (3); a defoaming mechanism is further installed on the inner wall of the cylinder. The return mixing inner part (5) comprises an inner cylinder (530) and a sieve plate (520) and a distribution disc (510) installed on the inner wall of the inner cylinder (530) from top to bottom. The Venturi mixing inner part (12) comprises a gas collecting port (121), a conical cavity (122), a necked section (123), a mixing core (124), a mixing diameter expanding port (125) and a connecting leg (126); the connecting leg (126) is connected with the bottom of the return mixing inner part (5); the mixing diameter expanding port (125) is connected below the connecting leg (126); the bottom of the mixing diameter expanding port (125) is connected with a cavity structure, the cavity structure is provided with the necked section (123) communicated with the bottom of the mixing diameter expanding port (125), the cavity structure is further provided with the conical cavity (122) communicated with the bottom of the necked section (123), and the bottom of the cavity structure is connected with the outwardly expanded gas collecting port (121); the mixing core (124) is filled in the necked section (123). The mixing core (124) is regular packing and made of stainless steel.

2. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that The liquid inlet pipe (3) is located 150-300 mm below the upper head.

3. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, The distance between the lowermost end of the Venturi mixing inner part (12) and the air inlet pipe (6) is 100-500 mm.

4. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, The diameter of the inner cylinder (530) is smaller than that of the cylinder, and the height of the inner cylinder (530) is 500-1500 mm.

5. A gas absorption apparatus with a venturi mixing internal element according to claim 4, characterized in that The distance between the outer wall of the inner cylinder (530) and the inner wall of the cylinder is 100-200 mm.

6. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, A through hole is formed in the distribution disc (510), and a tubular distributor is arranged in the through hole.

7. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, A strip-shaped grid is formed in the sieve plate (520).

8. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, The number of the connecting legs (126) is not less than 3.

9. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, An absorption liquid spray head (10) is arranged at the end of the liquid inlet pipe (3) in the cylinder.

10. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, A gas bubble diffuser (9) is arranged at the end of the air inlet pipe (6) in the cylinder.

11. A gas absorption apparatus with a venturi mixing internal element according to claim 1, characterized in that, The defoaming mechanism is a wire mesh structure, comprising an upper defoamer (2), a middle defoamer (4) and a lower defoamer (7).

12. A gas absorption apparatus with a venturi mixing internal element according to claim 11, characterized in that The upper defoamer (2) is located above the liquid inlet pipe (3), the wire mesh aperture of the upper defoamer (2) is 1-5 mm, the wire diameter is 0.5-2 mm, and the thickness is 50-100 mm.

13. A gas absorption apparatus with a venturi mixing internal element according to claim 12, characterized in that The middle demister (4) is located between the liquid inlet pipe (3) and the baffle (11), the wire mesh of the middle demister (4) has a hole diameter of 1mm-5mm, a wire diameter of 0.5mm-2mm and a thickness of 100-200mm.

14. A gas absorption apparatus with a venturi mixing internal element according to claim 11, wherein, The lower demister (7) is located below the air inlet pipe (6), the wire mesh of the lower demister (7) has a hole diameter of 2mm-8mm, a wire diameter of 0.5mm-2mm and a thickness of 100-200mm.

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