Circulating spraying type DMF (Dimethyl Formamide) waste gas recovery tower

Abstract

The invention relates to the field of air pollution prevention and control, in particular to a circulating spraying type DMF waste gas recovery tower which comprises an external cylinder, a circular plate is mounted at the upper end of the external cylinder, through grooves are formed in the circular plate and the inner bottom wall of the external cylinder, an internal cylinder is arranged on the inner bottom wall of the external cylinder, and a sliding cylinder is slidably arranged on the internal cylinder; the interior of the sliding barrel is communicated with the through groove in the lower end, an adsorption unit for filtering waste gas is arranged in the sliding barrel, a spraying unit for spraying and purifying the waste gas is further arranged in the sliding barrel, the adsorption unit and the spraying unit are integrated in the same device, additional pipeline connection is not needed, the occupied area of the device is reduced, and the cost is reduced. The compact and efficient development concept advocated by an energy-saving and environment-friendly cluster is met, and the problems of large occupied space and complex connection caused by independent arrangement of the two devices in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air pollution prevention and control, and particularly relates to a circulating spray type DMF waste gas recovery tower. BACKGROUND

[0002] In the production of chemical industry, synthetic leather, pharmaceutical industry and the like, waste gas containing dimethylformamide (DMF) is generated. DMF is toxic and irritating, and directly discharging it pollutes the environment and harms health. Therefore, it needs to be purified by high-efficiency activated carbon adsorption and spraying, so that it becomes a process of air pollution prevention and control equipment treatment that meets the standard, and the process needs to meet the requirements of energy-saving and environmental protection cluster development.

[0003] In the prior art, the treatment of DMF waste gas usually adopts the combination of high-efficiency activated carbon adsorption and spraying purification. However, the two are usually independent air pollution prevention and control equipment, and the gas needs to be introduced into different equipment for treatment. This not only increases the equipment space, but also needs additional pipeline connection, which is contrary to the compact and efficient development concept advocated by the energy-saving and environmental protection cluster.

[0004] Further, when the gas after one purification does not meet the standard or needs to be purified multiple times, the prior art usually realizes this by connecting multiple adsorption equipment or spraying equipment in series. This will further increase the space occupied by the equipment, and increase the cost of equipment purchase, installation and operation and maintenance. Moreover, the existing spraying equipment is difficult to disassemble and assemble, and the maintenance is troublesome. Therefore, the entire purification system is difficult to install and apply in small production sites or space-limited areas, and cannot meet the environmental protection treatment demand in different scenes that meets the requirements of the energy-saving and environmental protection cluster.

[0005] In the prior art, a patent with publication number CN216223694U discloses a DMF waste gas treatment device, which includes a DMF recovery tower and a spraying device arranged in the DMF recovery tower. The DMF recovery tower is provided with an air inlet at the bottom and an air outlet at the top. A manual chain hoist is arranged at the top. Rollers are arranged on both sides of the spraying device. A vertical sliding groove is arranged on the inner side wall of the recovery tower. The rollers are arranged in the sliding groove. The spraying device is provided with a connecting part at the top which is adapted to be connected with the hook of the chain hoist, and is connected with an external water inlet hose. The spraying device can be lifted by the chain hoist for convenient maintenance. However, although this technology improves some of the original problems, there are still aspects that need to be further optimized to better meet the actual detection needs.

[0006] 1. The above-mentioned prior art only involves spraying of the gas. If the gas needs to be adsorbed by activated carbon, external equipment is needed for adsorption. The adsorption and spraying cannot be realized in the same device, which not only increases the equipment space and connection complexity, but also does not meet the requirements of the energy-saving and environmental protection cluster for equipment integration and compactness.

[0007] 2. The existing spray device described above has only one unit, which has low efficiency and cannot ensure that the gas is completely purified. In addition, the gap between the spray component and the recovery tower in the above device is large. Although it can ensure that the gas continues to flow upward, it cannot ensure that the gas that has not been purified will move out. This may result in the direct emission of substandard gas, affecting the treatment effect. Some waste gas cannot have a long-term direct contact with the newly sprayed spray liquid, resulting in poor reaction effect.

[0008] Therefore, based on the above-stated viewpoints, there is still room for improvement in existing DMF waste gas recovery towers. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a circulating spray-type DMF waste gas recovery tower, comprising an outer cylinder, a circular plate installed at the upper end of the outer cylinder, through grooves formed on both the circular plate and the inner bottom wall of the outer cylinder, an inner cylinder provided on the inner bottom wall of the outer cylinder, a sliding cylinder slidably disposed on the inner cylinder, the interior of the sliding cylinder communicating with the through groove at the lower end, and an adsorption unit for filtering the waste gas disposed inside the sliding cylinder.

[0010] Furthermore, the sliding cylinder is equipped with a spray unit for purifying the exhaust gas.

[0011] The adsorption unit includes several gathering grooves opened inside the sliding cylinder and distributed around its axis and extension. The sliding cylinder also has several annular cavities that correspond one-to-one with and are connected to the gathering grooves. Adsorption components are installed in the annular cavities, and an air outlet groove that is connected to the annular cavity is opened on the outside of the inner cylinder.

[0012] Preferably, the adsorption assembly includes an arc-shaped frame installed within an annular cavity, and an arc-shaped carbon plate is installed within the arc-shaped frame.

[0013] A baffle plate is installed on the inner bottom wall of one side of the arc-shaped frame, and a breathable plate is installed between the end of the baffle plate and the inner bottom wall of the arc-shaped frame.

[0014] Preferably, the spray unit includes several annular tubes that are formed inside the sliding cylinder and correspond one-to-one with the annular cavity. Several inclined grooves that correspond one-to-one with the air outlet grooves are formed on the outside of the sliding cylinder, and the inclined grooves are inclined toward the air outlet grooves.

[0015] Several connecting pipes are installed between the inclined groove and the corresponding annular pipe.

[0016] Preferably, an atomizing nozzle is installed inside the connecting pipe and is connected to its interior.

[0017] Preferably, the outer side of the sliding cylinder is also provided with several leakage grooves that correspond one-to-one with and are connected to the air outlet grooves.

[0018] Preferably, the sliding cylinder is provided with a spraying assembly for spraying the exhaust gas, the spraying assembly comprises an annular pipe two formed in the sliding cylinder, a plurality of conveying pipes penetrating the annular pipe two are mounted on the sliding cylinder, and a plurality of arc-shaped pipes are penetratingly arranged outside the conveying pipes, and a plurality of atomizing nozzles are also mounted on the lower side of the arc-shaped pipes.

[0019] Preferably, a series pipe is penetratingly arranged between the annular pipe one and the annular pipe two, and the annular pipe one is also connected by the series pipe, a water inlet groove penetrating the lowermost annular pipe one is formed between the sliding cylinder and the built-in cylinder, and the other end of the water inlet groove penetrates the outer side wall of the built-in cylinder.

[0020] Preferably, a recycling assembly for recycling the spraying liquid is arranged on the inner bottom wall of the outer cylinder, the recycling assembly comprises a V-shaped groove formed on the inner bottom wall of the outer cylinder, and the outer cylinder bottom wall is provided with a water collecting pipe penetrating the V-shaped groove.

[0021] Preferably, the end of the circular plate and the built-in cylinder is provided with a reflux unit, the reflux unit comprises a rectangular box arranged on the circular plate and the end of the built-in cylinder, and a circular groove penetrating the corresponding through groove is formed on the upper and lower ends of the rectangular box.

[0022] Preferably, a horizontal pipe is penetratingly arranged on one side of the upper end of the rectangular box, and a bent pipe is penetratingly arranged on one side of the lower end of the rectangular box, and the ends of the horizontal pipe and the bent pipe correspond to each other.

[0023] In summary, the present application has at least one of the following beneficial technical effects: Firstly, the present application integrates the adsorption unit and the spraying unit in the same device, without the need for additional pipeline connection, thereby reducing the equipment floor area, meeting the compact and efficient development concept advocated by the energy-saving and environment-friendly cluster, and solving the problems of large space occupation and complex connection caused by the independent arrangement of the two in the prior art.

[0024] Secondly, the present application sets up a multi-layer spraying contact structure (primary atomization contact, inner wall flow guide secondary contact, and leakage liquid tertiary contact) and further spraying of the spraying assembly, and at the same time cooperates with the reflux treatment mechanism of the non-standard exhaust gas, so as to ensure the gas purification effect, avoid the problems of low efficiency of a single spraying device and possible direct emission of non-standard gas in the prior art, and realize efficient purification without connecting multiple devices. Thirdly, the sliding cylinder is designed to be extracted from the built-in cylinder, so that the adsorption unit and the spraying unit are convenient to maintain, thereby solving the problems of difficult quick disassembly and maintenance of the existing spraying equipment, making the device convenient to install and apply in small production sites or space-limited areas, and meeting the environmental protection treatment needs in different scenes. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in combination with the drawings and examples.

[0026] Figure 1 is the structural schematic diagram of the body of the present application.

[0027] Figure 2 is the cross-sectional view of the external cylinder of the present application.

[0028] Figure 3 is the cross-sectional view of the sliding cylinder of the present application.

[0029] Figure 4 is the partial structure enlarged view at A in the present application Figure 3

[0030] Figure 5 is the plan cross-sectional view among the adsorption unit, the adsorption assembly and the spraying unit of the present application.

[0031] Figure 6 is the structural schematic diagram of the spraying assembly of the present application.

[0032] Figure 7 is the plan view of the spraying assembly of the present application.

[0033] Figure 8 is the structural schematic diagram of the recycling assembly of the present application.

[0034] Figure 9 is the structural schematic diagram of the backflow unit and the blocking assembly of the present application.

[0035] Figure 10 is the partial structure enlarged view at B in the present application Figure 9

[0036] In the figure, 1, external cylinder; 10, round plate; 11, through groove; 12, internal cylinder; 13, sliding cylinder; 2, adsorption unit; 20, folding groove; 21, annular cavity; 22, air outlet groove; 3, adsorption assembly; 30, arc-shaped frame; 31, arc-shaped carbon plate; 32, blocking plate; 33, air permeable plate; 4, spraying unit; 40, annular tube one; 41, inclined groove; 42, connecting pipe; 43, atomizing nozzle; 44, leakage groove; 5, spraying assembly; 50, annular tube two; 51, conveying pipe; 52, arc-shaped pipe; 53, series pipe; 54, water inlet groove; 6, recycling assembly; 60, V-shaped groove; 61, water collecting pipe; 7, backflow unit; 70, rectangular box; 71, round groove; 72, cross pipe; 73, bent pipe; 8, blocking assembly; 80, rotating shaft; 81, blocking plate; 82, air pump; 83, branch pipe. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below. Figures 1 to 10

[0038] ​​​The embodiment of the application discloses a circulating spray type DMF waste gas recovery tower, which can perform carbon treatment and spraying on DMF waste gas, further, the spray liquid can be recycled and used, and the off-standard waste gas can be treated again through backflow, and the device is convenient to disassemble, maintain and meet the efficient and environmental treatment requirements.

[0039] Embodiment one: refer to Figure 1 、 Figure 2 and Figure 3 , which comprises an external cylinder 1, a circular plate 10, a through groove 11, an internal cylinder 12, a sliding cylinder 13, an adsorption unit 2 and a spraying unit 4, the circular plate 10 is installed on the upper end of the external cylinder 1, the through groove 11 is formed in the inner bottom wall of the external cylinder 1 and the circular plate 10, the internal cylinder 12 is arranged on the inner bottom wall of the external cylinder 1, the sliding cylinder 13 is slidably arranged on the internal cylinder 12, and the sliding cylinder 13 and the internal cylinder 12 are in key groove cooperation, so that accidental rotation of the sliding cylinder 13 in the internal cylinder 12 can be avoided; the through groove 11 at the lower end of the sliding cylinder 13 is in communication with the inside of the sliding cylinder 13, and the adsorption unit 2 for filtering waste gas is arranged in the sliding cylinder 13.

[0040] The waste gas enters the inside of the external cylinder 1 through the through groove 11 at the bottom of the external cylinder 1, and then enters the sliding cylinder 13, and the waste gas is primarily adsorbed and purified by the adsorption unit 2.

[0041] The spraying unit 4 for purifying waste gas by spraying is further arranged in the sliding cylinder 13, the waste gas is primarily purified by the adsorption unit 2, enters the spraying unit 4 in the sliding cylinder 13, the spray liquid sprayed by the spraying unit 4 contacts the waste gas, so that the residual DMF is dissolved and the impurities not adsorbed are removed, and the waste gas purified by double purification is discharged from the through groove 11 on the circular plate 10. After long-time use, the circular plate 10 can be taken off from the upper end of the external cylinder 1, and then the sliding cylinder 13 is extracted from the internal cylinder 12 and taken out through the opening at the upper end of the external cylinder 1.

[0042] Then, the adsorption unit 2 and the spraying unit 4 on the sliding cylinder 13 are comprehensively maintained: the residual DMF and impurities adsorbed on the adsorption unit 2 are cleaned, and the invalid adsorption material is replaced if necessary; after the maintenance is completed, the sliding cylinder 13 is reinstalled in the internal cylinder 12 through the opening at the upper end of the external cylinder 1, and finally the circular plate 10 is reinstalled on the external cylinder 1, so that the normal operation of the device can be restored. Refer to Figure 4 and Figure 5As shown, the adsorption unit 2 is used for filtering the exhaust gas. Specifically, the adsorption unit 2 comprises the collection groove 20, the annular cavity 21, the adsorption assembly 3 and the gas outlet groove 22. The collection groove 20 is arranged on the outer side of the sliding cylinder 13 and uniformly distributed around the axis of the sliding cylinder 13 and the extension. The annular cavity 21 is arranged in the sliding cylinder 13 and corresponds to the collection groove 20. The exhaust gas enters the sliding cylinder 13 from the through groove 11 at the lower end and then enters the annular cavity 21 from the collection groove 20. The adsorption assembly 3 is arranged in the annular cavity 21. The gas outlet groove 22 is arranged on the outer side of the built-in cylinder 12 and penetrates the annular cavity 21. The exhaust gas is purified by the adsorption assembly 3 and then discharged into the built-in cylinder 1 from the gas outlet groove 22.

[0043] With reference to Figs. 1-3, Figure 4 and Figure 5 As shown, the adsorption assembly 3 is used for filtering the exhaust gas. Specifically, the adsorption assembly 3 comprises the arc-shaped frame 30, the arc-shaped carbon plate 31, the barrier plate 32 and the gas permeable plate 33. The arc-shaped frame 30 is arranged in the annular cavity 21. The arc-shaped carbon plate 31 is arranged in the arc-shaped frame 30.

[0044] The arc-shaped carbon plate 31 is arranged on the arc-shaped frame 30. The exhaust gas entering the annular cavity 21 can enter the arc-shaped carbon plate 31 for adsorption reaction. The arc-shaped carbon plate 31 is composed of activated carbon plates.

[0045] The barrier plate 32 is arranged on the inner bottom wall of one side of the arc-shaped frame 30. The gas permeable plate 33 is arranged between the end of the barrier plate 32 and the inner bottom wall of the arc-shaped frame 30. The barrier plate 32 is used for supporting the gas permeable plate 33. The barrier plate 32 is a microporous plate. The exhaust gas can flow through the holes of the microporous plate.

[0046] Meanwhile, the design can avoid the direct contact between the liquid sprayed by the spraying unit 4 and the arc-shaped carbon plate 31, preventing the arc-shaped carbon plate 31 from being invalid due to the contact with the liquid. If the spraying liquid enters the gas outlet groove 22, the gas permeable plate 33 can effectively block the spraying liquid from contacting the arc-shaped carbon plate 31. In addition, when the exhaust gas flows out through the holes of the barrier plate 32, the gas pressure at the holes is high. In addition, the size of the holes only allows the gas to pass through, further preventing the spraying liquid from invading.

[0047] With reference to Figs. 1-3, Figure 4 and Figure 5As shown, i.e. a spray unit 4 for spray cleaning of the exhaust gas; specifically, the spray unit 4 includes annular tubes 40, inclined grooves 41, connecting pipes 42, atomizing nozzles 43 and leakage grooves 44, several annular tubes 40 are opened in the inside of the sliding cylinder 13 and correspond to the annular cavities 21 one by one, the outside of the sliding cylinder 13 is provided with several inclined grooves 41 corresponding to the gas outlet grooves 22 one by one, and the inclined grooves 41 are inclined towards the gas outlet grooves 22, and several connecting pipes 42 are provided between the inclined grooves 41 and the corresponding annular tubes 40, that is, the spray liquid in the annular tube 40 can enter the inclined groove 41 through the connecting pipe 42, and then enter the gas outlet groove 22 through the inclined groove 41, and contact and react with the exhaust gas.

[0048] The connecting pipe 42 is provided with an atomizing nozzle 43 penetrating the inside thereof, the atomizing nozzle 43 can change the spray liquid in the connecting pipe 42 into an atomized shape, so that the atomized spray liquid can be more fully contacted and reacted with the exhaust gas.

[0049] The outside of the sliding cylinder 13 is also provided with several leakage grooves 44 corresponding to the gas outlet grooves 22 and penetrating, since the inclined grooves 41 are inclined at an angle towards the gas outlet grooves 22, and the gas outlet grooves 22 are inclined upwards, this double inclined design constructs a reverse contact channel of "exhaust gas upward and spray liquid downward": after the exhaust gas flows out from the gas permeable plate 33, it moves upward along the inclined direction of the gas outlet groove 22, while the spray liquid in the annular tube 40 is transported to the inclined groove 41 through the connecting pipe 42, and then flows to the gas outlet groove 22 along the slope of the inclined groove 41, forming a flow path from top to bottom. At this time, the atomizing nozzle 43 atomizes the spray liquid into fine droplets, which form all-around cross contact with the upward flowing exhaust gas, ensuring that every exhaust gas discharged from the gas permeable plate 33 can be fully mixed with fresh atomized spray liquid, greatly improving the contact efficiency of DMF molecules and spray liquid.

[0050] During the reaction process, part of the atomized spray liquid will directly react with the residual DMF in the exhaust gas and move upward with the exhaust gas, and the other part will be sprayed on the inclined inner wall of the gas outlet groove 22 and slowly flow towards the blocking plate 32 under the action of gravity. When the spray liquid reaches the end of the inside of the gas outlet groove 22, it will be discharged through the pre-set leakage groove 44 - this flow path not only avoids direct impact of the spray liquid on the gas permeable plate 33, but also prevents excessive liquid from penetrating into the activated carbon plate by the blocking action of the blocking plate 32. After all, the gas permeable plate 33 mainly targets splashing droplets, and the blocking ability for continuously flowing liquid is limited.

[0051] More importantly, the spray liquid flowing out of the leakage groove 44 is not directly discarded: since the outlet of the air outlet groove 22 corresponds in space to the adjacent air outlet groove 22 below, when the air below is discharged upward from its air outlet groove 22, it will again contact the spray liquid dripping from the leakage groove 44 above. This multi-layer design of primary atomization contact plus inner wall flow guide secondary contact plus leaked spray liquid tertiary contact allows the exhaust gas to continue to react with the spray liquid during its upward movement, thoroughly removing residual DMF and fundamentally ensuring the sufficiency of the purification reaction.

[0052] Referring to Figure 6 and Figure 7 , that is, the sliding cylinder 13 is provided with a spraying assembly 5 for spraying the entire exhaust gas; specifically, the spraying assembly 5 includes an annular pipe two 50, a delivery pipe 51, an arc-shaped pipe 52, a series pipe 53, and a water inlet groove 54, the annular pipe two 50 is opened in the inside of the sliding cylinder 13, a plurality of delivery pipes 51 are installed on the sliding cylinder 13 and penetrate the annular pipe two 50, and a plurality of arc-shaped pipes 52 are provided outside the delivery pipes 51 and penetrate the arc-shaped pipes 52, and a plurality of atomizing nozzles 43 are also installed on the lower side of the arc-shaped pipes 52.

[0053] Since the exhaust gas in the uppermost air outlet groove 22 cannot contact the gas flowing out of the leakage groove 44, and in order to improve the reaction efficiency of the exhaust gas, in specific use, the spray liquid in the annular pipe two 50 can enter the plurality of arc-shaped pipes 52 through the delivery pipes 51, and then be sprayed into the outer cylinder 1 through the atomizing nozzles 43, further spraying the exhaust gas discharged from the air outlet groove 22 into the outer cylinder 1, to ensure that the DMF in the exhaust gas can be purified.

[0054] The series pipes 53 are provided between the annular pipe one 40 and the annular pipe two 50, and the annular pipe one 40 is also connected by the series pipes 53, the water inlet groove 54 is opened between the sliding cylinder 13 and the built-in cylinder 12 and penetrates the lowermost annular pipe one 40, and the other end of the water inlet groove 54 penetrates the outer side wall of the built-in cylinder 12, that is, the water inlet groove 54 can be connected with the external water supply equipment, and water can be supplied to the plurality of annular pipe one 40 and annular pipe two 50 through the water inlet groove 54 and the series pipes 53, and the staggered distribution of the series pipes 53 can ensure that the previous annular pipe one 40 is filled with spray liquid before entering the next annular pipe one 40 through the series pipes 53, ensuring that the water pressure in each annular pipe one 40 and annular pipe two 50 is stable.

[0055] Referring to Figure 8As shown, the inner bottom wall of the outer cylinder 1 is provided with a recycling assembly 6 for recycling the spraying liquid. Specifically, the recycling assembly 6 includes a V-shaped groove 60 and a water collecting pipe 61. The V-shaped groove 60 is formed on the inner bottom wall of the outer cylinder 1, and the bottom wall of the outer cylinder 1 is provided with the water collecting pipe 61 which is in communication with the V-shaped groove 60. The spraying liquid sprayed by the atomizing nozzles 43 on the leakage groove 44 and the arc-shaped pipe 52 will finally fall into the V-shaped groove 60 on the inner bottom wall of the outer cylinder 1, and then flow into the water collecting pipe 61 through the V-shaped groove 60 and be discharged out of the outer cylinder 1. The collected spraying liquid can be treated to remove DMF therein, and the treated liquid can be recycled as spraying liquid, thereby realizing effective utilization of resources.

[0056] Referring to Figure 9 and Figure 10 As shown, the end of the circular plate 10 and the inner cylinder 12 is provided with a reflux unit 7. Specifically, the reflux unit 7 includes a rectangular box 70, a circular groove 71, a horizontal pipe 72 and a bent pipe 73. The rectangular box 70 is arranged at the end of the circular plate 10 and the inner cylinder 12. The upper and lower ends of the rectangular box 70 are both provided with the circular groove 71 which is in communication with the corresponding through groove 11. That is, the circular groove 71 on the outer side of the rectangular box 70 can be connected with an external pipeline. The untreated waste gas can be discharged into the sliding cylinder 13 through the circular groove 71 at the lower end. Then, the waste gas after reaction can be discharged through the two circular grooves 71 at the upper end.

[0057] The side of the rectangular box 70 at the upper end is provided with the horizontal pipe 72 in communication, and the side of the rectangular box 70 at the lower end is provided with the bent pipe 73 in communication. The ends of the horizontal pipe 72 and the bent pipe 73 correspond to each other.

[0058] The movable contact connection between the horizontal pipe 72 and the bent pipe 73 can also drive the rectangular box 70 at the upper end to move synchronously when the circular plate 10 is separated from the outer cylinder 1. The horizontal pipe 72 at the upper end can also move synchronously with the circular plate 10. Conversely, after the circular plate 10 returns to the outer cylinder 1, the end of the horizontal pipe 72 can continue to communicate with the end of the bent pipe 73.

[0059] In actual use, a gas sensor or other instrument for detecting whether the waste gas treatment meets the standard can be installed in the rectangular box 70 at the upper end. If the sensor detects that the waste gas treatment does not meet the standard after one reaction, the circular grooves 71 on the outer side of the rectangular box 70 can be blocked to prevent new waste gas from entering the rectangular box 70 at the lower end and the waste gas that does not meet the standard from being discharged through the circular grooves 71 at the upper end. At this time, the waste gas in the rectangular box 70 at the upper end can enter the horizontal pipe 72, then pass through the bent pipe 73 and enter the rectangular box 70 at the lower end, and then enter the sliding cylinder 13 through the rectangular box 70 at the lower end for second treatment.

[0060] Example Two: continuing to refer to Figure 9 and Figure 10As shown, in order to be able to block the transverse pipe 72 and the bent pipe 73, a blocking assembly 8 is installed in the rectangular box 70 on the basis of the first embodiment; specifically, the blocking assembly 8 comprises a rotating shaft 80, a blocking plate 81, an air pump 82 and a branch pipe 83, the rotating shaft 80 is rotatably arranged in the interior of the rectangular box 70, the rotating shaft 80 is sleeved with the blocking plate 81 on the outside, the air pump 82 is installed in the circular groove 71 on the side of the rectangular box 70 close to the through groove 11, one side of the rotating shaft 80 can pass through the outside of the rectangular box 70 and be connected with an external driving motor, so that the rotation can drive the blocking plate 81 on the outside to block the corresponding bent pipe 73 and transverse pipe 72 and circular groove 71 (the circular groove 71 on the outside of the rectangular box 70). In the initial state, the blocking plate 81 blocks the corresponding transverse pipe 72 and bent pipe 73 to prevent the exhaust gas from accidentally entering the transverse pipe 72 or the bent pipe 73.

[0061] After it is found that the gas detection is not up to standard, the two rotating shafts 80 synchronously drive the corresponding blocking plates 81 to stop blocking the transverse pipe 72 and the bent pipe 73, and instead block the circular groove 71 on the outside, while the upper and lower air pumps 82 can accelerate the flow speed and pressure of the exhaust gas, so that the exhaust gas has enough power to enter the sliding cylinder 13 or the transverse pipe 72, preventing the gas from being retained in the interior of the device The through branch pipe 83 is arranged on one side of the lower rectangular box 70, and a one-way valve is installed in the branch pipe 83. After the circular groove 71 is blocked by the blocking plate 81, the external cylinder 1 and the interior of the rectangular box 70 are in a blocked state without new gas entering. In order to avoid the situation that the air pump 82 cannot accelerate the exhaust gas due to the lack of new gas, the one-way valve in the branch pipe 83 is opened in this state, so that the external gas can enter the rectangular box 70 to provide the amount of gas entering the air pump 82, so that the exhaust gas retained in the interior of the device can always flow and finally be discharged to the outside of the external cylinder 1, and then the rotating shaft 80 drives the blocking plate 81 to continue blocking the transverse pipe 72 and the bent pipe 73.

[0062] When working: first, untreated DMF exhaust gas is discharged into the sliding cylinder 13 through the circular groove 71 of the lower rectangular box 70 through the external pipeline, and after the exhaust gas enters from the lower through groove 11, it flows into the annular cavity 21 through the converging groove 20.

[0063] Second, the arc-shaped carbon plate 31 (activated carbon plate) in the annular cavity 21 performs initial adsorption and purification on the exhaust gas, and the purified exhaust gas is discharged into the interior of the external cylinder 1 through the air outlet groove 22. In this process, the blocking plate 32 and the gas permeable plate 33 block the contact between the spray liquid and the activated carbon plate, ensuring the adsorption effect.

[0064] Third step, the spray liquid in the annular tube 40 enters the gas outlet groove 22 through the connecting pipe 42 and the inclined groove 41, and is atomized by the atomizing nozzle 43 to react with the upward flowing exhaust gas, and part of the spray liquid flows out through the leakage groove 44 to contact the exhaust gas discharged from the gas outlet groove 22 again.

[0065] Fourth step, the spray liquid in the annular tube 50 is sprayed into the outer barrel 1 by the atomizing nozzle 43 through the conveying pipe 51 and the arc-shaped pipe 52 to further spray and purify the exhaust gas discharged from the gas outlet groove 22, and to ensure that the upper end exhaust gas is fully reacted.

[0066] Fifth step, the spray liquid finally falls into the V-shaped groove 60 on the bottom wall of the outer barrel 1, flows into the collecting pipe 61 along the V-shaped groove 60, and is discharged after being treated to remove DMF and is recycled as spray liquid.

[0067] Sixth step, the purified exhaust gas moves upward and is discharged through the through groove 11 on the circular plate 10, and if the detection instrument in the upper end rectangular box 70 shows that the exhaust gas does not meet the standard, the outer circular groove 71 is blocked, the exhaust gas flows back to the lower end rectangular box 70 through the horizontal pipe 72 and the bent pipe 73, and is reprocessed in the sliding cylinder 13.

[0068] Seventh step, after long-term use, the circular plate 10 is removed, the sliding cylinder 13 is pulled out, and the adsorption unit 2 and the spray unit 4 are maintained, cleaned or replaced, and then reinstalled to restore the operation of the equipment.

[0069] It is apparent for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view.

[0070] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A circulating spray type DMF waste gas recovery tower, comprising an outer cylinder (1), a circular plate (10) installed at the upper end of the outer cylinder (1), and through grooves (11) formed on both the circular plate (10) and the inner bottom wall of the outer cylinder (1), characterized in that: An inner tube (12) is provided on the inner bottom wall of the outer tube (1). A sliding tube (13) is slidably provided on the inner tube (12). The interior of the sliding tube (13) is connected to the through groove (11) at the lower end. An adsorption unit (2) for filtering waste gas is provided inside the sliding tube (13). Furthermore, a spray unit (4) for spraying and purifying exhaust gas is also provided inside the sliding cylinder (13); The adsorption unit (2) includes several gathering grooves (20) opened in the sliding cylinder (13) and distributed around its axis and extension. The sliding cylinder (13) also has several annular cavities (21) that correspond one-to-one with the gathering grooves (20) and are connected. The adsorption assembly (3) is installed in the annular cavity (21), and the outer side of the inner cylinder (12) also has an air outlet groove (22) that is connected to the annular cavity (21).

2. The circulating spray type DMF waste gas recovery tower according to claim 1, characterized in that: The adsorption assembly (3) includes an arc frame (30) installed in an annular cavity (21), and an arc carbon plate (31) is installed in the arc frame (30). A baffle plate (32) is installed on the inner bottom wall of one side of the arc frame (30), and a breathable plate (33) is installed between the end of the baffle plate (32) and the inner bottom wall of the arc frame (30).

3. The circulating spray type DMF waste gas recovery tower according to claim 1, characterized in that: The spray unit (4) includes several annular tubes (40) that are opened in the sliding cylinder (13) and correspond one-to-one with the annular cavity (21). Several inclined grooves (41) that correspond one-to-one with the air outlet groove (22) are opened on the outside of the sliding cylinder (13), and the inclined grooves (41) are inclined towards the air outlet groove (22). Several connecting pipes (42) are provided between the inclined groove (41) and the corresponding annular pipe (40).

4. The circulating spray type DMF waste gas recovery tower according to claim 3, characterized in that: Atomizing nozzle (43) is installed inside the connecting pipe (42) and is connected to its interior.

5. The circulating spray type DMF waste gas recovery tower according to claim 1, characterized in that: Several leakage grooves (44) are also provided on the outside of the sliding cylinder (13) that correspond one-to-one with and are connected to the air outlet groove (22).

6. A circulating spray-type DMF waste gas recovery tower according to claim 4, characterized in that: The sliding cylinder (13) is provided with a spray assembly (5) for spraying exhaust gas. The spray assembly (5) includes an annular pipe (50) opened inside the sliding cylinder (13). Several conveying pipes (51) that communicate with the annular pipe (50) are installed on the sliding cylinder (13). Several arc-shaped pipes (52) are provided on the outside of the conveying pipes (51). Several atomizing nozzles (43) are also installed on the lower side of the arc-shaped pipes (52).

7. A circulating spray-type DMF waste gas recovery tower according to claim 6, characterized in that: A series pipe (53) is provided between the first annular pipe (40) and the second annular pipe (50), and the first annular pipe (40) is also connected to each other through the series pipe (53). A water inlet groove (54) is provided between the sliding cylinder (13) and the inner cylinder (12) and is connected to the lowest annular pipe (40), and the other end of the water inlet groove (54) is connected to the outer wall of the inner cylinder (12).

8. The circulating spray type DMF waste gas recovery tower according to claim 1, characterized in that: The bottom wall of the outer cylinder (1) is provided with a recovery component (6) for recovering the spray liquid. The recovery component (6) includes a V-shaped groove (60) opened on the bottom wall of the outer cylinder (1), and a water collection pipe (61) communicating with the V-shaped groove (60) is provided on the bottom wall of the outer cylinder (1).

9. A circulating spray-type DMF waste gas recovery tower according to claim 1, characterized in that: A return unit (7) is installed at the ends of the circular plate (10) and the inner cylinder (12). The return unit (7) includes a rectangular box (70) set at the ends of the circular plate (10) and the inner cylinder (12). The upper and lower ends of the rectangular box (70) are provided with circular grooves (71) that communicate with the corresponding through grooves (11).

10. A circulating spray-type DMF waste gas recovery tower according to claim 9, characterized in that: A horizontal pipe (72) is provided through one side of the upper rectangular box (70), and a bent pipe (73) is provided through one side of the lower rectangular box (70). The ends of the horizontal pipe (72) and the bent pipe (73) correspond to each other.

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