Device for purifying waste gas generated in formic acid production

Abstract

The invention relates to the technical field of waste gas purification, and provides a formic acid production waste gas purification device which comprises a spraying tower, an impurity removal shell, a stirring mechanism, a spraying mechanism, a communicating pipe, a first gas inlet mechanism and a second gas inlet mechanism, the spraying tower is internally provided with filler, and the impurity removal shell is fixedly arranged at the bottom end of the spraying tower; the impurity removal shell is filled with an absorbent, the stirring mechanism is arranged in the impurity removal shell and used for stirring the absorbent in the impurity removal shell, the spraying mechanism is arranged in the spraying tower and used for spraying the absorbent to the filler, and a plurality of communicating pipes are arranged between the bottom end of the inner wall of the spraying tower and the bottom end of the inner wall of the impurity removal shell in a communicating mode. By means of the technical scheme, the waste gas purification device is used for solving the technical problem that in the waste gas purification process in the prior art, the purification efficiency is easily affected due to the fact that chippings are mixed in waste gas.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of waste gas purification, and specifically, to a waste gas purification device for formic acid production. Background Art

[0002] The waste gas purification device for formic acid production is a device used to treat waste gas containing pollutants such as formic acid vapor and formic acid esters generated during the production of formic acid, so that it can meet the discharge standards.

[0003] In the existing waste gas purification device for formic acid production, a spray tower is generally selected for spraying and purifying the absorbent. The waste gas enters from the lower part of the tower and fully contacts with the absorbent liquid (such as an alkaline solution like sodium hydroxide) sprayed from the top of the tower in the packing layer. The formic acid reacts with the absorbent liquid, such as through neutralization reactions, and is absorbed and removed.

[0004] However, formic acid production is usually carried out by reacting methanol and carbon monoxide under the action of a catalyst. Small pieces of catalyst debris and dust are easily mixed in the waste gas and discharged. During the process of spraying and purifying the waste gas in the spray tower, the small pieces of debris and dust are easily attached to or enter the packing, thus affecting the normal operation of the packing and further affecting the waste gas purification efficiency. Summary of the Invention

[0005] To overcome the above defects, the present invention provides a waste gas purification device for formic acid production, which is used to solve the technical problem that the purification efficiency is easily affected by debris mixed in the waste gas in the prior art during the waste gas purification process.

[0006] According to one aspect, at least one embodiment of the present invention provides a waste gas purification device for formic acid production, including a spray tower. A packing is installed in the spray tower. The device further includes an impurity removal housing, a stirring mechanism, a spraying mechanism, a connecting pipe, a first air inlet mechanism, and a second air inlet mechanism. The impurity removal housing is fixedly arranged at the bottom end of the spray tower. An absorbent is filled in the impurity removal housing. The stirring mechanism is arranged in the impurity removal housing and is used to stir the absorbent in the impurity removal housing. The spraying mechanism is arranged in the spray tower and is used to spray the absorbent onto the packing. A plurality of the connecting pipes are communicatively arranged between the inner wall bottom end of the spray tower and the inner wall bottom end of the impurity removal housing. The first air inlet mechanism is arranged on the spray tower and is used to introduce waste gas into the impurity removal housing. The second air inlet mechanism is arranged in the spray tower and is used to introduce the waste gas in the impurity removal housing into the spray tower.

[0007] Preferably, the first air intake mechanism includes a first cavity and a first air inlet pipe. The first cavity is formed in the bottom wall of the impurity removal housing. The inner top wall of the first cavity is provided with a first air inlet. The first air inlet pipe is disposed through the side wall of the impurity removal housing and is in communication with the first cavity. An air intake control valve is installed on the first air inlet pipe.

[0008] Further, the stirring mechanism includes a support pipe, a second cavity, and a rotating mechanism. The support pipe is rotatably and sealingly disposed in the impurity removal housing. The top end of the support pipe is sealed and extends into the spray tower. A plurality of stirring rods are fixedly provided on the side wall of the support pipe. The second cavity is formed in the bottom wall of the impurity removal housing. Wherein, the support pipe extends into the second cavity and is rotatably and sealingly connected to the inner bottom wall of the second cavity. The rotating mechanism is disposed on the impurity removal housing and is used to drive the support pipe to rotate.

[0009] Still further, the rotating mechanism includes a first toothed ring, a first gear, a first motor, and a protective cover. The first toothed ring is fixedly provided on the outer wall of the support pipe. The first gear is rotatably disposed in the second cavity. The first gear meshes with the first toothed ring. The first motor is installed on the inner bottom wall of the impurity removal housing. The output end of the first motor is fixedly connected to the first gear. The protective cover is fixedly provided on the inner bottom wall of the impurity removal housing. The first motor is located inside the protective cover.

[0010] Even further, the second air intake mechanism includes a second air inlet pipe and a third air inlet. A plurality of the second air inlet pipes are communicated with the side wall of the support pipe. One end of the second air inlet pipe away from the support pipe is sealed. A plurality of second air inlets are formed in the bottom side wall of the second air inlet pipe. A plurality of the third air inlets are formed in the side wall of the support pipe. The third air inlet is in communication with the impurity removal housing. A filter screen is installed in the third air inlet.

[0011] Based on the above solution, a cleaning ring is fixedly provided on the inner bottom wall of the impurity removal housing. Cleaning bristles are evenly distributed on the inner wall of the cleaning ring. The cleaning bristles are in contact with the filter screen.

[0012] On the basis of the above solution, the spraying mechanism includes a support disk, a first driving groove, a second driving groove, a spraying cover, a spraying housing, a first water inlet pipe, and a second water inlet pipe. The support disk is fixedly arranged inside the spraying tower. A plurality of support openings are formed in the support disk. The first driving groove is formed in the inner bottom wall of the support disk. An annular second driving groove is formed in the inner bottom wall of the support disk. The spraying cover is rotatably and sealingly arranged at the bottom of the first driving groove. A plurality of first nozzles are communicated and arranged on the bottom side wall of the spraying cover. An annular spraying housing is rotatably and sealingly arranged in the second driving groove. A plurality of second nozzles are communicated and arranged on the bottom side wall of the spraying housing. The first water inlet pipe is arranged through the side wall of the spraying tower. One end of the first air inlet pipe penetrates through the inner top wall of the support disk and extends into the spraying cover. The second water inlet pipe is communicated and rotatably arranged between the spraying housing and the spraying cover.

[0013] On the basis of the above solution, a driving mechanism is further included. The driving mechanism is arranged on the support disk and is used for driving the spraying cover and the spraying housing to rotate. The driving mechanism includes a second gear ring, a third gear ring, a third cavity, a second gear, and a second motor. The second gear ring is fixedly arranged on the outer wall of the spraying cover. The third gear ring is fixedly arranged on the inner wall of the spraying housing. The third cavity is formed in the support disk. The third cavity is respectively communicated with the first driving groove and the second driving groove. The second gear is rotatably arranged in the third cavity. The second gear meshes with the second gear ring and the third gear ring. The second motor is installed on the support disk. The output end of the second motor is fixedly connected with the second gear.

[0014] The beneficial effects of the embodiments of the present invention are as follows: 1. In the present invention, through the arrangement of the first air inlet mechanism and the stirring mechanism, after the waste gas is introduced into the impurity removal housing, the absorbent can be used to adsorb debris and dust. At the same time, the operation of the first motor can drive the first gear to rotate, and through the meshing of the first gear and the first gear ring, the support pipe and the stirring rod are driven to rotate, thereby improving the adsorption effect. At the same time, the dust and debris can be filtered through the filter screen, so as to prevent the debris and dust from entering the filler and affecting the purification efficiency. 2. In the present invention, through the arrangement of the second air inlet mechanism, the adsorbed and filtered waste gas can be introduced into the spraying tower through the third air inlet and the second air inlet. At the same time, the rotation of the support pipe can adjust the positions of the second water inlet pipe and the second air inlet, so as to facilitate the uniform introduction of the waste gas into the spraying tower, thereby improving the purification efficiency. 3. In the present invention, through the arrangement of the spraying mechanism and the driving mechanism, it is convenient to spray the absorbent onto the packing through the first nozzle and the second nozzle. At the same time, the driving mechanism can drive the first nozzle and the second nozzle to adjust their positions, thereby improving the spraying effect of the absorbent and further enhancing the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some exemplary embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the exemplary embodiments of the present invention and these drawings.

[0016] Figure 1 It is a schematic structural diagram of a formic acid production waste gas purification device in an embodiment of the present invention; Figure 2 For Figure 1 it is a schematic cross-sectional structural diagram of the spray tower in the embodiment of Figure 3 For Figure 1 it is a schematic cross-sectional structural diagram of the spray tower from another perspective in the embodiment of Figure 4 For Figure 1 it is a schematic structural diagram of the rotating mechanism in the embodiment of Figure 5 For Figure 1 it is a schematic cross-sectional structural diagram at the spraying mechanism in the embodiment of Figure 6 For Figure 1 it is a schematic cross-sectional structural diagram at the driving mechanism in the embodiment of Figure 7 For Figure 1 it is a schematic cross-sectional structural diagram at the support plate in the embodiment of

[0017] In the figure: 1. Spray tower; 2. Packing; 3. Impurity removal housing; 4. Connecting pipe; 5. First cavity; 6. First intake pipe; 7. Intake control valve; 8. Support pipe; 9. Stirring rod; 10. First gear ring; 11. First gear; 12. First motor; 13. Protective cover; 14. Second intake pipe; 15. Second intake port; 16. Third intake port; 17. Cleaning ring; 18. Support plate; 19. Spray cover; 20. First nozzle; 21. Spray housing; 22. Second nozzle; 23. First water inlet pipe; 24. Second water inlet pipe; 25. Second gear ring; 26. Third gear ring; 27. Second gear; 28. Second motor. DETAILED DESCRIPTION OF THE EMBODIMENTS The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0018] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0019] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0021] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0023] like Figures 1-7As shown in the figure, it shows a formic acid production waste gas purification device in an embodiment of the present invention, including a spray tower 1, a filler 2 is installed in the spray tower 1, and also includes an impurity removal housing 3, a stirring mechanism, a spraying mechanism, a connecting pipe 4, a first air inlet mechanism and a second air inlet mechanism. The impurity removal housing 3 is fixedly arranged at the bottom end of the spray tower 1, an absorbent is filled in the impurity removal housing 3, the stirring mechanism is arranged in the impurity removal housing 3 for stirring the absorbent in the impurity removal housing 3, the spraying mechanism is arranged in the spray tower 1 for spraying the absorbent onto the filler 2, a plurality of connecting pipes 4 are communicated between the inner bottom end of the inner wall of the spray tower 1 and the inner bottom end of the inner wall of the impurity removal housing 3, the first air inlet mechanism is arranged on the spray tower 1 for introducing waste gas into the impurity removal housing 3, and the second air inlet mechanism is arranged in the spray tower 1 for introducing the waste gas in the impurity removal housing 3 into the spray tower 1.

[0024] Referring to Figures 1-3 , the first air inlet mechanism includes a first cavity 5 and a first air inlet pipe 6. A first cavity 5 is formed in the bottom wall of the impurity removal housing 3. A first air inlet is formed in the inner top wall of the first cavity 5. The first air inlet pipe 6 penetrates through the side wall of the impurity removal housing 3 and is communicated with the first cavity 5. An air inlet control valve 7 is installed on the first air inlet pipe 6. Specifically, waste gas can be introduced into the first cavity 5 through the first air inlet pipe 6, and then the waste gas can be introduced into the impurity removal housing 3 through the first air inlet. At this time, the absorbent can be used to adsorb debris and dust.

[0025] Referring to Figures 2-4 , the stirring mechanism includes a support pipe 8, a second cavity and a rotating mechanism. The support pipe 8 is rotatably and sealingly arranged in the impurity removal housing 3. The top end of the support pipe 8 is sealed and extends into the spray tower 1. A plurality of stirring rods 9 are fixedly arranged on the side wall of the support pipe 8. The second cavity is formed in the bottom wall of the impurity removal housing 3. Among them, the support pipe 8 extends into the second cavity and is rotatably and sealingly connected to the inner bottom wall of the second cavity. The rotating mechanism is arranged on the impurity removal housing 3 for driving the support pipe 8 to rotate. The rotating mechanism includes a first toothed ring 10, a first gear 11, a first motor 12 and a protective cover 13. The first toothed ring 10 is fixedly arranged on the outer wall of the support pipe 8. The first gear 11 is rotatably arranged in the second cavity. The first gear 11 meshes with the first toothed ring 10. The first motor 12 is installed on the inner bottom wall of the impurity removal housing 3. The output end of the first motor 12 is fixedly connected to the first gear 11. The protective cover 13 is fixedly arranged on the inner bottom wall of the impurity removal housing 3. The first motor 12 is located inside the protective cover 13. Specifically, the operation of the first motor 12 can drive the first gear 11 to rotate, and at the same time drive the support pipe 8 and the stirring rods 9 to rotate through the meshing of the first gear 11 and the first toothed ring 10, so as to improve the adsorption effect.

[0026] Referring to Figures 2-4, the second intake mechanism includes a second intake pipe 14 and a third intake port 16. A plurality of second intake pipes 14 are communicatively connected to the side wall of the support pipe 8. One end of the second intake pipe 14 away from the support pipe 8 is sealed. A plurality of second intake ports 15 are formed in the bottom side wall of the second intake pipe 14. A plurality of third intake ports 16 are formed in the side wall of the support pipe 8. The third intake port 16 is communicatively connected to the impurity removal housing 3. A filter screen is installed in the third intake port 16. A cleaning ring 17 is fixedly arranged on the inner bottom wall of the impurity removal housing 3. Cleaning bristles are evenly distributed on the inner wall of the cleaning ring 17. The cleaning bristles are in contact with the filter screen. Specifically, the adsorbed and filtered waste gas can be introduced into the spray tower 1 through the third intake port 16 and the second intake port 15. At the same time, the rotation of the support pipe 8 can adjust the positions of the second intake pipe 14 and the second intake port 15, so as to facilitate the uniform introduction of the waste gas into the spray tower 1, thereby improving the purification efficiency.

[0027] Referring to Figures 5-7 , the spraying mechanism includes a support disk 18, a first drive groove, a second drive groove, a spray hood 19, a spray housing 21, a first water inlet pipe 23 and a second water inlet pipe 24. The support disk 18 is fixedly arranged in the spray tower 1. A plurality of support ports are formed in the support disk 18. The first drive groove is formed in the inner bottom wall of the support disk 18. An annular second drive groove is formed in the inner bottom wall of the support disk 18. The spray hood 19 is rotatably and sealingly arranged at the bottom of the first drive groove. A plurality of first spray nozzles 20 are communicatively connected to the bottom side wall of the spray hood 19. An annular spray housing 21 is rotatably and sealingly arranged in the second drive groove. A plurality of second spray nozzles 22 are communicatively connected to the bottom side wall of the spray housing 21. The first water inlet pipe 23 penetrates through the side wall of the spray tower 1. One end of the first intake pipe 6 penetrates through the inner top wall of the support disk 18 and extends into the spray hood 19. The second water inlet pipe 24 is communicatively and rotatably arranged between the spray housing 21 and the spray hood 19. Specifically, the absorbent can be added into the spray hood 19 through the first water inlet pipe 23. At the same time, the absorbent can be introduced into the spray housing 21 through the second water inlet pipe 24, so that the absorbent can be sprayed onto the packing 2 through the first spray nozzles 20 and the second spray nozzles 22.

[0028] Referring to Figure 6 With Figure 7, further comprising a driving mechanism arranged on the support disk 18 for driving the spray hood 19 and the spray housing 21 to rotate. The driving mechanism includes a second gear ring 25, a third gear ring 26, a third cavity, a second gear 27 and a second motor 28. The second gear ring 25 is fixedly arranged on the outer wall of the spray hood 19, the third gear ring 26 is fixedly arranged on the inner wall of the spray housing 21, the third cavity is formed in the support disk 18 and is respectively communicated with the first driving groove and the second driving groove. The second gear 27 is rotatably arranged in the third cavity and meshes with the second gear ring 25 and the third gear ring 26. The second motor 28 is installed on the support disk 18, and the output end of the second motor 28 is fixedly connected to the second gear 27. Specifically, the operation of the second motor 28 can drive the second gear 27 to rotate. At the same time, through the meshing of the second gear 27 with the second gear ring 25 and the third gear ring 26 respectively, the spray hood 19 and the spray housing 21 can be driven to rotate, so that the positions of the first spray head 20 and the second spray head 22 can be adjusted, thereby improving the spraying effect.

[0029] In this embodiment, during use, the operator can introduce the waste gas into the first cavity 5 through the first intake pipe 6, and then introduce the waste gas into the impurity removal housing 3 through the first air inlet. At this time, the absorbent can be used to adsorb the debris and dust. During the adsorption process, the operator controls the operation of the first motor 12. The operation of the first motor 12 can drive the first gear 11 to rotate. At the same time, through the meshing of the first gear 11 with the first gear ring 10, the support pipe 8 and the stirring rod 9 are driven to rotate, so that the adsorption effect can be improved. Then, the waste gas after adsorption can be introduced into the spray tower 1 through the third air inlet 16 and the second air inlet 15. During the introduction process, the debris and dust can be filtered through the filter screen. At the same time, the absorbent can be added into the spray hood 19 through the first water inlet pipe 23, and the absorbent can be introduced into the spray housing 21 through the second water inlet pipe 24, so that the absorbent can be sprayed onto the packing 2 through the first spray head 20 and the second spray head 22. During the spraying process, the operator controls the operation of the second motor 28. The operation of the second motor 28 can drive the second gear 27 to rotate. At the same time, through the meshing of the second gear 27 with the second gear ring 25 and the third gear ring 26 respectively, the spray hood 19 and the spray housing 21 can be driven to rotate, so that the positions of the first spray head 20 and the second spray head 22 can be adjusted, thereby improving the spraying effect, and the waste gas can be purified by the absorbent. The purified waste gas can be discharged through the air outlet at the top of the spray tower 1.

[0030] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An exhaust gas purification device for formic acid production, comprising a spray tower (1), wherein a filler (2) is installed in the spray tower (1), and is characterized in that, Further included are: An impurity removal housing (3), which is fixedly arranged at the bottom end of the spray tower (1), and an absorbent is filled in the impurity removal housing (3); A stirring mechanism, which is arranged in the impurity removal housing (3) and is used for stirring the absorbent in the impurity removal housing (3); A spraying mechanism, which is arranged in the spray tower (1) and is used for spraying the absorbent onto the packing (2); A connecting pipe (4), and a plurality of the connecting pipes (4) are communicated and arranged between the bottom end inner wall of the spray tower (1) and the bottom end inner wall of the impurity removal housing (3); A first air inlet mechanism, which is arranged on the spray tower (1) and is used for introducing waste gas into the impurity removal housing (3); A second air inlet mechanism, which is arranged in the spray tower (1) and is used for introducing the waste gas in the impurity removal housing (3) into the spray tower (1).

2. The formic acid production waste gas purification device according to claim 1, characterized in that, The first air inlet mechanism includes: A first cavity (5), which is formed in the bottom wall of the impurity removal housing (3), and a first air inlet is formed in the inner top wall of the first cavity (5); A first air inlet pipe (6), which penetrates through the side wall of the impurity removal housing (3), the first air inlet pipe (6) is communicated with the first cavity (5), and an air inlet control valve (7) is installed on the first air inlet pipe (6).

3. The formic acid production waste gas purification device according to claim 2, characterized in that, The stirring mechanism includes: A support pipe (8), which is rotatably and sealingly arranged in the impurity removal housing (3), the top end of the support pipe (8) is sealed and extends into the spray tower (1), and a plurality of stirring rods (9) are fixedly arranged on the side wall of the support pipe (8); A second cavity, which is formed in the bottom wall of the impurity removal housing (3), wherein the support pipe (8) extends into the second cavity and is rotatably and sealingly connected to the inner bottom wall of the second cavity; A rotating mechanism, which is arranged on the impurity removal housing (3) and is used for driving the support pipe (8) to rotate.

4. The purification device for formic acid production waste gas according to claim 3, characterized in that, The rotating mechanism includes: A first toothed ring (10), which is fixedly arranged on the outer wall of the support pipe (8); A first gear (11), which is rotatably arranged in the second cavity, and the first gear (11) meshes with the first toothed ring (10); A first motor (12), which is installed on the inner bottom wall of the impurity removal housing (3), and the output end of the first motor (12) is fixedly connected to the first gear (11); A protective cover (13), which is fixedly arranged on the inner bottom wall of the impurity removal housing (3), and the first motor (12) is located inside the protective cover (13).

5. The formic acid production waste gas purification device according to claim 4, characterized in that, The second air inlet mechanism includes: A second air inlet pipe (14), and a plurality of the second air inlet pipes (14) are communicated and arranged on the side wall of the support pipe (8), one end of the second air inlet pipe (14) far away from the support pipe (8) is sealed, and a plurality of second air inlets (15) are formed in the bottom side wall of the second air inlet pipe (14); A third air inlet (16), a plurality of the third air inlets (16) are formed in the side wall of the support pipe (8), the third air inlets (16) communicate with the impurity removal housing (3), and a filter screen is installed in the third air inlets (16).

6. The purification device for formic acid production waste gas according to claim 5, characterized in that, A cleaning ring (17) is fixedly arranged on the inner bottom wall of the impurity removal housing (3), cleaning bristles are uniformly distributed on the inner wall of the cleaning ring (17), and the cleaning bristles are in contact with the filter screen.

7. An exhaust gas purification device for formic acid production according to claim 6, characterized in that, The spraying mechanism includes: A support disk (18), the support disk (18) is fixedly arranged in the spraying tower (1), and a plurality of support openings are formed in the support disk (18); A first driving groove and a second driving groove, the first driving groove is formed in the inner bottom wall of the support disk (18), and an annular second driving groove is formed in the inner bottom wall of the support disk (18); A spraying cover (19), the spraying cover (19) is rotatably and sealingly arranged at the bottom of the first driving groove, and a plurality of first spray nozzles (20) are communicated and arranged on the bottom side wall of the spraying cover (19); A spraying housing (21), an annular spraying housing (21) is rotatably and sealingly arranged in the second driving groove, and a plurality of second spray nozzles (22) are communicated and arranged on the bottom side wall of the spraying housing (21); A first water inlet pipe (23), the first water inlet pipe (23) is arranged through the side wall of the spraying tower (1), and one end of the first air inlet pipe (6) penetrates through the inner top wall of the support disk (18) and extends into the spraying cover (19); A second water inlet pipe (24), the second water inlet pipe (24) is communicated and rotatably arranged between the spraying housing (21) and the spraying cover (19).

8. The formic acid production waste gas purification device according to claim 7, characterized in that, It further includes a driving mechanism, the driving mechanism is arranged on the support disk (18) and is used for driving the spraying cover (19) and the spraying housing (21) to rotate, and the driving mechanism includes: A second toothed ring (25), the second toothed ring (25) is fixedly arranged on the outer wall of the spraying cover (19); A third toothed ring (26), the third toothed ring (26) is fixedly arranged on the inner wall of the spraying housing (21); A third cavity, the third cavity is formed in the support disk (18), and the third cavity communicates with the first driving groove and the second driving groove respectively; A second gear (27), the second gear (27) is rotatably arranged in the third cavity, and the second gear (27) meshes with the second toothed ring (25) and the third toothed ring (26); A second motor (28), the second motor (28) is installed on the support disk (18), and the output end of the second motor (28) is fixedly connected with the second gear (27).

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