Tail gas collecting device

Abstract

The invention relates to the technical field of tail gas treatment, in particular to a tail gas collecting device. Comprising a tank body, the upper end of the tank body fixedly communicates with a liquid inlet pipe and an air outlet pipe, the lower end of the tank body fixedly communicates with a liquid outlet pipe and an air inlet pipe, a hydraulic rod is fixed to the upper end of the tank body, the telescopic end of the hydraulic rod is located in the tank body, and a piston cylinder is fixed to the telescopic end of the hydraulic rod; the bubble crushing assembly is connected with a lower screw through a ball screw pair, and the lower end of the lower screw is fixedly connected with the lower end of the tank body. The device has a multi-dimensional crushing mechanism, the hydraulic rod drives the bubble crushing assembly to axially move and circumferentially rotate, absorption liquid is stirred to form turbulent flow while bubbles are punctured, and the contact time of tail gas and the absorption liquid is prolonged. When the movable plate rotates and ascends, the absorption liquid is sprayed through the inclined lower spraying holes, and the surface tension of bubbles is destroyed in a shock wave mode.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, and in particular to a tail gas collection device. Background Art

[0002] In the crude benzene hydrorefining process, the tail gas mainly contains incompletely reacted hydrogen, benzene series (benzene, toluene, xylene, etc.), hydrogen sulfide and a small amount of hydrocarbon substances. The current "Petrochemical Industry Pollutant Emission Standard" (GB 31571-2015) has strict limits on the emission concentration of benzene series (benzene ≤ 4mg / m³), and the efficiency of traditional water washing method is difficult to meet environmental protection requirements.

[0003] The tail gas generated during the hydrogenation refining process of crude benzene needs to be treated before being collected. When treating the tail gas, a water washing process is often used, but it has the following defects: the gas-liquid mass transfer efficiency is restricted by the bubble aggregation phenomenon, and the surface tension of the absorption liquid causes the bubbles to merge to form a gas film barrier.

[0004] When using amine solutions to treat hydrogen sulfide, the presence of benzene series will cause the absorption liquid to emulsify, produce a stable foam layer, and cause the effective mass transfer area to decrease. The greater the bubble surface tension, the higher the bubble stability, resulting in an increase in gas phase retention, a shortened effective contact time, and a decrease in the removal efficiency of benzene series.

[0005] Therefore, it is necessary to develop a device that can effectively break the absorption liquid bubbles during the tail gas collection process. Summary of the invention

[0006] The main purpose of the present invention is to provide a tail gas collection device capable of efficiently treating tail gas. The device can effectively remove bubbles generated when the tail gas passes through the absorption liquid, thereby ensuring the gas-liquid mass transfer efficiency.

[0007] In order to achieve the above object, the technical solution provided by the present invention is: An exhaust gas collection device comprises a tank body, wherein the upper end of the tank body is fixedly connected with a liquid inlet pipe and an air outlet pipe, and the lower end of the tank body is fixedly connected with a liquid outlet pipe and an air inlet pipe, and is characterized in that a hydraulic rod is fixed at the upper end of the tank body, the telescopic end of the hydraulic rod is located in the tank body, a piston cylinder is fixed on the telescopic end of the hydraulic rod, a bubble crushing assembly is coaxially arranged at the lower end of the piston cylinder, the bubble crushing assembly is connected with a lower screw through a ball screw pair, the lower end of the lower screw is fixedly connected with the lower end of the tank body, an upper screw concentric with the lower screw is fixed at the upper end of the bubble crushing assembly, the upper screw is located in the piston cylinder, and the outer side of the upper screw An upper sleeve is provided, and the upper sleeve is connected to the upper screw through a ball screw pair. A piston plate is fixed to the upper end of the upper sleeve, and the piston plate sliding seal is arranged in the piston cylinder. When the upper screw rotates, the upper sleeve can drive the piston plate to move in the piston cylinder along the axial direction of the upper screw. A plurality of channels are evenly distributed on the inner circumference of the cylinder wall of the piston cylinder, the upper end of the channel is connected with the interior of the piston cylinder, and the lower end of the channel is connected with the interior of the tank body, a one-way liquid inlet valve is installed in the lower end of the channel, and a plurality of upper spray holes are opened on the piston cylinder part outside the channel, the upper spray holes are connected with the channels, and a one-way liquid outlet valve is installed in the upper spray holes.

[0008] Specifically, the bubble breaking assembly includes a lower sleeve, a lower lead screw is connected to the lower sleeve through a ball screw pair, a plurality of breaking units are fixed to the outside of the lower sleeve, and the plurality of breaking units are linearly arrayed in the axial direction of the lower sleeve, the breaking unit includes a movable plate concentrically fixedly connected to the lower sleeve, a plurality of through holes are provided on the movable plate, a fixed tube corresponding to and connected to the through holes is fixed to the lower end of the movable plate, the lower end of the fixed tube is blocked, a plurality of lower spray holes are provided on the tube wall of the lower part of the fixed tube, the upper lead screw is fixed to the uppermost movable plate, a ring-shaped limit groove is provided on the uppermost movable plate, a limit ring is concentrically fixed to the lower end of the piston cylinder, and the limit ring is rotatably arranged in the limit groove.

[0009] Specifically, one end of the lower spray hole away from the fixed pipe axis is inclined downward.

[0010] Specifically, valves are installed on the liquid inlet pipe, the air outlet pipe, the liquid outlet pipe and the air inlet pipe.

[0011] Specifically, a convex block is fixed on the inner wall of the piston cylinder, the length direction of the convex block is parallel to the axial direction of the piston cylinder, and an adapting surface corresponding to the convex block is provided on the piston plate, and the adapting surface is in sliding sealing contact with the convex block.

[0012] Specifically, a plurality of arc-shaped holes are formed on the movable plate.

[0013] Specifically, the lower end of the fixed tube is a pointed end.

[0014] Specifically, the axial direction of the upper spray hole is parallel to the radial direction of the piston cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This device has a multi-dimensional crushing mechanism. The hydraulic rod drives the bubble crushing assembly to move axially and rotate circumferentially, puncturing the bubbles while stirring the absorption liquid to form turbulence, prolonging the contact time between the tail gas and the absorption liquid. When the moving plate rotates and rises, the absorption liquid is sprayed through the inclined lower spray hole, destroying the surface tension of the bubble in the form of a shock wave. The design of the fixed tube tip can locally accelerate the fluid to form a microjet, further refine the unbroken bubbles, and ensure the mass transfer efficiency of gas and liquid.

[0016] 2. The crushing units are arranged linearly in the height direction of the tank to ensure that the bubbles are processed step by step during the rising process to prevent them from escaping.

[0017] 3. The arc-shaped holes of the moving plate guide the absorption liquid to form a vortex, increasing the uniformity of gas-liquid mixing.

[0018] 4. When the piston plate moves upward, it squeezes the absorption liquid in the piston cylinder. The absorption liquid forms a high-pressure spray through the upper spray hole, which can cover the gas escaping from the absorption liquid, improve the gas-liquid mixing efficiency, and improve the gas-liquid mass transfer efficiency. The spray direction of the absorption liquid is perpendicular to the rising path of the bubble, forming an interception net, which further improves the bubble breaking efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the device.

[0020] Figure 2 Schematic diagram of the internal structure of the tank.

[0021] Figure 3 Schematic diagram of the internal structure of the piston cylinder.

[0022] Figure 4 for Figure 3 Magnified view of area A.

[0023] Figure 5 for Figure 3 Magnified view of area B.

[0024] Figure 6 Schematic diagram of the bubble crushing component.

[0025] Figure 7 for Figure 6 Magnified view of area C.

[0026] Figure 8 A cross-sectional view of the fixed tube.

[0027] The names of the parts in the accompanying drawings are: 1. tank body; 2. liquid inlet pipe; 3. liquid outlet pipe; 4. air inlet pipe; 5. air outlet pipe; 6. hydraulic rod; 7. piston cylinder; 8. bump; 9. channel; 10. upper spray hole; 11. limiting ring; 12. movable plate; 13. limiting groove; 14. upper screw; 15. upper sleeve; 16. piston plate; 17. matching surface; 18. fixing pipe; 19. through hole; 20. lower spray hole; 21. lower sleeve; 22. lower screw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] like Figure 1-Figure 8 As shown, an exhaust gas collection device includes a tank body 1, the upper end of the tank body 1 is fixedly connected with a liquid inlet pipe 2 and an air outlet pipe 5, and the lower end of the tank body 1 is fixedly connected with a liquid outlet pipe 3 and an air inlet pipe 4.

[0030] Valves are installed on the liquid inlet pipe 2, the air outlet pipe 5, the liquid outlet pipe 3 and the air inlet pipe 4.

[0031] A hydraulic rod 6 is fixed to the upper end of the tank body 1, and the telescopic end of the hydraulic rod 6 is located in the tank body 1. A piston cylinder 7 is fixed to the telescopic end of the hydraulic rod 6, and a bubble breaking component is coaxially rotated at the lower end of the piston cylinder 7.

[0032] The bubble breaking assembly is connected to a lower screw 22 via a ball screw pair, and the lower end of the lower screw 22 is fixedly connected to the lower end of the tank body 1.

[0033] The bubble breaking assembly comprises a lower sleeve 21, and a lower lead screw 22 is connected to the lower sleeve 21 via a ball screw pair.

[0034] A plurality of crushing units are fixed on the outer side of the lower sleeve 21 , and the plurality of crushing units are linearly arrayed in the axial direction of the lower sleeve 21 .

[0035] The crushing unit includes a movable plate 12 fixedly connected concentrically with the lower sleeve 21, and a plurality of arc holes are provided on the movable plate 12. An annular limiting groove 13 is provided on the uppermost movable plate 12, and a limiting ring 11 is fixedly fixed concentrically at the lower end of the piston cylinder 7, and the limiting ring 11 is rotatably arranged in the limiting groove 13.

[0036] The movable plate 12 is provided with a plurality of through holes 19, and a fixed pipe 18 corresponding to and connected to the through holes 19 is fixed at the lower end of the movable plate 12, and the lower end of the fixed pipe 18 is blocked, and the lower end of the fixed pipe 18 is a pointed end. A plurality of lower spray holes 20 are provided on the pipe wall at the lower part of the fixed pipe 18, and the end of the lower spray hole 20 away from the axis of the fixed pipe 18 is inclined downward.

[0037] An upper lead screw 14 concentric with the lower lead screw 22 is fixed to the upper end of the bubble breaking assembly. Specifically, the upper lead screw 14 is fixed on the uppermost moving plate 12.

[0038] The upper lead screw 14 is located in the piston cylinder 7 , and an upper sleeve 15 is sleeved on the outer side of the upper lead screw 14 . The upper sleeve 15 is connected to the upper lead screw 14 through a ball screw pair.

[0039] A piston plate 16 is fixed to the upper end of the upper sleeve 15 , and the piston plate 16 is slidingly and sealingly arranged in the piston cylinder 7 .

[0040] A bump 8 is fixed on the inner wall of the piston cylinder 7 , and the length direction of the bump 8 is parallel to the axial direction of the piston cylinder 7 . An adapting surface 17 corresponding to the bump 8 is formed on the piston plate 16 , and the adapting surface 17 is in sliding and sealing contact with the bump 8 .

[0041] When the upper lead screw 14 rotates, the upper sleeve 15 can drive the piston plate 16 to move in the piston cylinder 7 along the axial direction of the upper lead screw 14 .

[0042] A plurality of channels 9 are evenly distributed on the inner circumference of the cylinder wall of the piston cylinder 7, the upper end of the channel 9 is connected to the inside of the piston cylinder 7, the lower end of the channel 9 is connected to the inside of the tank body 1, a one-way liquid inlet valve is installed in the lower end of the channel 9, a plurality of upper spray holes 10 are opened on the part of the piston cylinder 7 outside the channel 9, the upper spray holes 10 are connected to the channel 9, and a one-way liquid outlet valve is installed in the upper spray holes 10. The axial direction of the upper spray holes 10 is parallel to the radial direction of the piston cylinder 7.

[0043] When in use, close the valve on the liquid outlet pipe 3, add absorption liquid into the tank body 1 through the liquid inlet pipe 2, so that the liquid level of the absorption liquid in the tank body 1 is higher than the lower end of the channel 9. At this time, the absorption liquid enters the fixed tube 18 through the through hole 19.

[0044] Then close the valve on the liquid inlet pipe 2, connect the exhaust gas discharge pipe with the air inlet pipe 4, and open the valves on the air inlet pipe 4 and the air outlet pipe 5. The exhaust gas enters the tank body 1 through the air inlet pipe 4 and mixes with the absorption liquid. The exhaust gas is washed with the absorption liquid and then discharged through the air outlet pipe 5.

[0045] The impact of the exhaust gas on the absorption liquid causes a large number of bubbles to be generated in the tank body 1. The bubbles move upward and are punctured by the fixed tube 18, so that the exhaust gas in the bubbles can fully contact with the absorption liquid, thereby improving the gas-liquid mass transfer efficiency and the absorption liquid's treatment efficiency for harmful substances in the exhaust gas.

[0046] During the process of exhaust gas entering the tank body 1, the hydraulic rod 6 causes its telescopic end to move up and down intermittently.

[0047] When the telescopic end of the hydraulic rod 6 moves downward, the piston cylinder 7 moves downward, thereby causing the movable plate 12 and the lower sleeve 21 to move downward. Since the lower sleeve 21 is connected to the lower screw 22 by a ball screw pair, the lower sleeve 21 can rotate when it moves downward. When the lower sleeve 21 rotates downward, the movable plate 12 and the fixed tube 18 rotate downward.

[0048] When the movable plate 12 and the fixed tube 18 rotate downward, more bubbles are punctured and the absorption liquid is stirred to form turbulence, thereby prolonging the contact time between the tail gas and the absorption liquid.

[0049] The design of the tip of the fixed tube 18 can locally accelerate the fluid, form a micro jet, and further refine the unbroken bubbles, thereby ensuring the mass transfer efficiency of gas and liquid.

[0050] The arc-shaped holes of the moving plate 12 guide the absorption liquid to form a vortex, thereby increasing the uniformity of gas-liquid mixing.

[0051] The rotation of the movable plate 12 causes the upper screw 14 to rotate, while the piston plate 16 cannot rotate due to the restriction of the protrusion 8. The piston plate 16 and the upper sleeve 15 move downward in the piston cylinder 7. The space between the upper end of the piston plate 16 and the upper end of the piston cylinder 7 increases and generates negative pressure. The one-way liquid inlet valve opens, and the absorption liquid in the tank body 1 enters the piston cylinder 7 above the piston plate 16 through the one-way liquid inlet valve and the channel 9. At this time, the one-way liquid outlet valve is closed.

[0052] When the telescopic end of the hydraulic rod 6 moves upward, the piston cylinder 7 moves upward, thereby causing the movable plate 12 and the lower sleeve 21 to move upward. Since the lower sleeve 21 is connected to the lower screw 22 by a ball screw pair, the lower sleeve 21 can rotate when it moves upward. When the lower sleeve 21 rotates upward, the movable plate 12 and the fixed tube 18 rotate upward.

[0053] When the movable plate 12 and the fixed pipe 18 rotate, the absorption liquid is sprayed out through the lower spray hole 20 under the action of centrifugal force, and the sprayed absorption liquid impacts the surrounding bubbles to break the bubbles.

[0054] When the moving plate 12 drives the upper screw 14 to rotate upward, the upper sleeve 15 drives the piston plate 16 to move upward in the piston cylinder 7, so that the piston plate 16 squeezes the absorption liquid in the piston cylinder 7. After being squeezed, the absorption liquid in the piston cylinder 7 is sprayed outward through the channel 9, the upper spray hole 10 and the one-way liquid outlet valve. At this time, the one-way liquid inlet valve is closed. The absorption liquid sprayed from the upper spray hole 10 forms a high-pressure spray, which can cover the gas escaping from the absorption liquid, improve the gas-liquid mixing efficiency, and improve the gas-liquid mass transfer efficiency.

[0055] The spraying direction of the absorption liquid through the upper spray hole 10 is perpendicular to the rising path of the bubbles, forming an interception net, which further improves the bubble breaking efficiency.

[0056] 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. An exhaust gas collection device, comprising a tank body (1), wherein the upper end of the tank body (1) is fixedly connected with a liquid inlet pipe (2) and an air outlet pipe (5), and the lower end of the tank body (1) is fixedly connected with a liquid outlet pipe (3) and an air inlet pipe (4), characterized in that: A hydraulic rod (6) is fixed to the upper end of the tank body (1), the telescopic end of the hydraulic rod (6) is located in the tank body (1), a piston cylinder (7) is fixed to the telescopic end of the hydraulic rod (6), a bubble crushing assembly is coaxially arranged at the lower end of the piston cylinder (7), the bubble crushing assembly is connected to a lower screw (22) via a ball screw pair, the lower end of the lower screw (22) is fixedly connected to the lower end of the tank body (1), an upper screw (14) concentric with the lower screw (22) is fixed to the upper end of the bubble crushing assembly, the upper screw (14) is located in the piston cylinder (7), an upper sleeve (15) is sleeved on the outer side of the upper screw (14), the upper sleeve (15) is connected to the upper screw (14) via a ball screw pair, and the upper end of the upper sleeve (15) A piston plate (16) is fixed thereto. The piston plate (16) is slidingly sealed and arranged in the piston cylinder (7). When the upper screw (14) rotates, the upper sleeve (15) can drive the piston plate (16) to move in the piston cylinder (7) along the axial direction of the upper screw (14). A plurality of channels (9) are evenly distributed on the inner circumference of the cylinder wall of the piston cylinder (7). The upper end of the channel (9) is communicated with the interior of the piston cylinder (7). The lower end of the channel (9) is communicated with the interior of the tank body (1). A one-way liquid inlet valve is installed in the lower end of the channel (9). A plurality of upper spray holes (10) are opened on the piston cylinder (7) outside the channel (9). The upper spray holes (10) are communicated with the channel (9). A one-way liquid outlet valve is installed in the upper spray hole (10).

2. The exhaust gas collection device according to claim 1, characterized in that: The bubble crushing assembly comprises a lower sleeve (21), a lower lead screw (22) connected to the lower sleeve (21) via a ball screw pair, a plurality of crushing units are fixed on the outer side of the lower sleeve (21), and the plurality of crushing units are arranged in a linear array in the axial direction of the lower sleeve (21), the crushing unit comprises a movable plate (12) fixedly connected to the lower sleeve (21) concentrically, a plurality of through holes (19) are provided on the movable plate (12), a fixed tube (18) corresponding to and connected to the through holes (19) is fixed at the lower end of the movable plate (12), the lower end of the fixed tube (18) is blocked, a plurality of lower spray holes (20) are provided on the tube wall at the lower part of the fixed tube (18), an upper lead screw (14) is fixed to the uppermost movable plate (12), an annular limiting groove (13) is provided on the uppermost movable plate (12), a limiting ring (11) is fixedly fixed to the lower end of the piston cylinder (7), and the limiting ring (11) is rotatably arranged in the limiting groove (13).

3. The exhaust gas collection device according to claim 2, characterized in that: The end of the lower spray hole (20) that is away from the axis of the fixed pipe (18) is inclined downward.

4. The exhaust gas collection device according to claim 1, characterized in that: Valves are installed on the liquid inlet pipe (2), the air outlet pipe (5), the liquid outlet pipe (3) and the air inlet pipe (4).

5. The exhaust gas collection device according to claim 1, characterized in that: A convex block (8) is fixed on the inner wall of the piston cylinder (7), the length direction of the convex block (8) is parallel to the axial direction of the piston cylinder (7), and a matching surface (17) corresponding to the convex block (8) is provided on the piston plate (16), and the matching surface (17) is in sliding sealing contact with the convex block (8).

6. The exhaust gas collection device according to claim 2, characterized in that: The movable plate (12) is provided with a plurality of arc-shaped holes.

7. The exhaust gas collection device according to claim 1, characterized in that: The lower end of the fixed tube (18) is a pointed end.

8. The exhaust gas collection device according to claim 1, characterized in that: The axial direction of the upper spray hole (10) is parallel to the radial direction of the piston cylinder (7).

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