Papermaking deodorization equipment

Abstract

The invention relates to the technical field of papermaking, in particular to papermaking deodorization equipment which comprises a plurality of spray towers communicated in sequence, and the spray towers are used for performing acid pickling, alkali washing and water washing on waste gas in sequence. The spraying tower is arranged, trace hydrogen sulfide, ammonia gas and other volatile organic compounds which do not react completely in acid washing and alkali washing are further dissolved, it is avoided that exhausted waste gas contains irritant gas, it is guaranteed that the finally exhausted waste gas reaches the standard, damage to the air quality is reduced, and therefore the life stability of surrounding residents is guaranteed.

Description

Technical Field

[0001] This application relates to the field of papermaking technology, and in particular to a papermaking deodorization device. Background Technology

[0002] In the papermaking process, the wire section vacuum blower is the core equipment of the wire section dewatering system. It generates negative pressure to create a vacuum environment to accelerate paper web dewatering, stabilize the forming process, and ensure the smooth transfer of the paper web from the forming wire to the press section.

[0003] The exhaust gas generated during the operation of the vacuum blower contains hydrogen sulfide and ammonia, which are metabolic products of microorganisms. When the exhaust gas generated by the vacuum blower is directly discharged into the external environment, the emission of exhaust gas will significantly reduce the surrounding air quality, thereby affecting the lives of the surrounding residents. Summary of the Invention

[0004] In order to improve the quality of exhaust gas discharged from the vacuum blower in the papermaking process, this application provides a papermaking deodorization device.

[0005] This application provides a papermaking deodorization device, which adopts the following technical solution: A papermaking deodorization device includes multiple spray towers connected in sequence, wherein the multiple spray towers sequentially perform acid washing, alkali washing and water washing on the waste gas.

[0006] By adopting the above technical solution, the exhaust gas generated by the vacuum blower in the network section passes through multiple spray towers to complete the acid washing, alkaline washing, and water washing processes. In the acid washing stage, ammonia reacts with the acidic solution to produce soluble ammonium salts. In the alkaline washing stage, hydrogen sulfide reacts with the alkaline solution to generate sulfide precipitates or soluble salts. Finally, the water washing stage further dissolves trace amounts of hydrogen sulfide, ammonia, and other volatile organic compounds that were not completely reacted during the acid and alkaline washing stages. This prevents the exhaust gas from containing irritating gases, ensures that the final exhaust gas meets the standards, reduces damage to air quality, and thus guarantees the stability of the lives of surrounding residents.

[0007] Optionally, the spray tower includes a tower body, an air inlet pipe, an air outlet pipe, a liquid inlet pipe, a liquid outlet pipe, filter media, and multiple nozzles. The liquid inlet pipe and the liquid outlet pipe are connected at intervals at both ends of the tower body in the height direction, and both the liquid inlet pipe and the liquid outlet pipe are connected to the inner cavity of the tower body. The filter media is connected to the inner wall of the tower body and is located between the liquid inlet pipe and the liquid outlet pipe. The multiple nozzles are connected at intervals on the surface of the liquid inlet pipe facing the filter media. The liquid in the liquid inlet pipe is sprayed onto the surface of the filter media through the nozzles. The air inlet pipe and the air outlet pipe are connected at intervals at both ends of the tower body in the height direction, and both the air inlet pipe and the air outlet pipe are connected to the inner cavity of the tower body. The filter media is located between the air inlet pipe and the air outlet pipe. Waste gas enters the inner cavity of the tower body through the air inlet pipe, passes through the filter media, and is discharged from the air outlet pipe.

[0008] By adopting the above technical solution, the reaction liquid is sprayed into the inner cavity of the tower through multiple nozzles via the inlet pipe, and the filter packing is located between the inlet pipe and the outlet pipe. The liquid sprayed from the nozzles seeps into the inner cavity of the filter packing, while the exhaust gas enters the inner cavity of the tower through the inlet pipe and is discharged from the outlet pipe through the filter packing. The liquid in the filter packing and the exhaust gas fully contact and react, and the liquid sprayed from the nozzles fully contact and react with the exhaust gas in the inner cavity of the tower, increasing the contact time between the exhaust gas and the liquid, thereby improving the reaction efficiency between the exhaust gas and the liquid.

[0009] Optionally, the tower body is connected to a guide assembly, the guide assembly including a guide tube, an air inlet channel is opened on the bottom wall of the tower body, and a plurality of air outlet holes are spaced apart on the inner wall of the air inlet channel. The air outlet holes connect the air inlet channel and the inner cavity of the tower body. One end of the guide tube is connected to the inner wall of the tower body facing the air inlet pipe, and the other end of the guide tube is embedded in the inner wall of the air inlet channel. The guide tube connects the air inlet channel and the air inlet pipe. Exhaust gas passes through the air inlet pipe, the guide tube, the air inlet channel, and enters the inner cavity of the tower body through the air outlet holes.

[0010] By adopting the above technical solution, when the reaction liquid is sprayed into the inner cavity of the tower through multiple nozzles via the inlet pipe, the reaction liquid fills the filter packing and then accumulates on the bottom wall of the tower due to its own gravity. The exhaust gas enters the inner cavity of the tower through the inlet pipe, then through the guide pipe and the inlet channel in sequence, and then through the outlet hole. After impacting the reaction liquid, the exhaust gas passes through the filter packing and is discharged through the outlet pipe. The exhaust gas is discharged after being fully contacted with the reaction liquid three times, thereby improving the deodorization efficiency of the exhaust gas.

[0011] Optionally, the guide assembly further includes multiple one-way valves, each one-to-one with an outlet and connected to the inner wall of the outlet, the one-way valves supplying waste gas from the outlet into the inner cavity of the tower body.

[0012] By adopting the above technical solution, the exhaust gas in the one-way valve outlet enters the inner cavity of the tower body and impacts the reaction liquid accumulated on the bottom wall of the tower body. The reaction liquid and the exhaust gas come into full contact and react, thereby improving the deodorization efficiency of the exhaust gas. Moreover, the reaction liquid is not easy to flow back into the inner cavity of the guide pipe through the outlet, thereby improving the stability of the reaction liquid stored in the inner cavity of the tower body.

[0013] Optionally, the guide assembly further includes a filter screen connected to the inner cavity of the tower body. The filter screen is located between the air inlet pipe and the liquid outlet pipe. The filter screen has clearance holes for the guide pipe to pass through. The reaction liquid in the filter packing is filtered by the filter screen and then accumulates on the bottom wall of the tower body.

[0014] By adopting the above technical solution, the filter screen is located between the air inlet pipe and the liquid outlet pipe. After the reaction liquid in the filter packing is filtered by the filter screen, it accumulates on the bottom wall of the tower body, making it difficult for the reaction liquid to carry impurities and block the check valve, thereby ensuring the stability of the check valve operation.

[0015] Optionally, the tower body is connected to a stirring assembly, which includes a stirring impeller. The stirring impeller is rotatably connected to the inner wall of the tower body and is located between the nozzle and the filter packing. The stirring impeller rotates and drives the reaction liquid sprayed from the nozzle to swirl within the inner cavity of the tower body.

[0016] By adopting the above technical solution, the stirring impeller is located between the nozzle and the filter packing. The stirring impeller rotates on the inner wall of the tower and drives the reaction liquid sprayed by the nozzle to swing in the inner cavity of the tower, increasing the residence time of the reaction liquid in the inner cavity of the tower, so that the waste gas and the reaction liquid can fully contact and react in the inner cavity of the tower, further improving the deodorization efficiency of the waste gas.

[0017] Optionally, the stirring assembly includes a driving impeller, at least two synchronous pulleys, and a synchronous belt used in conjunction with the synchronous pulleys. The driving impeller is rotatably connected to the inner wall of the tower body near the outlet pipe. When the exhaust gas in the tower body enters the outlet pipe, it impacts the blades of the driving impeller and drives the driving impeller to rotate. The rotation axis of the driving impeller and the rotation axis of the stirring impeller are parallel to each other. One of the synchronous pulleys is coaxially connected to the rotation axis of the driving impeller, and the other synchronous pulley is coaxially connected to the rotation axis of the stirring impeller. The synchronous belt tensions and connects the two synchronous pulleys.

[0018] By adopting the above technical solution, when the exhaust gas in the tower enters the outlet pipe, the active impeller is located on the inner wall of the tower near the outlet pipe. The exhaust gas impacts the blades of the active impeller and drives the active impeller to rotate. The synchronous belt tensions and connects the two synchronous pulleys. The active impeller drives the stirring impeller to rotate. There is no need for an external power device to drive the stirring impeller to rotate, which reduces energy consumption and thus reflects the concept of energy saving.

[0019] Optionally, the tower body is connected to a cleaning assembly, which includes a cleaning brush and a reciprocating screw. The reciprocating screw is rotatably connected to the inner wall of the tower body and is located between the filter packing and the filter screen. The cleaning brush is threadedly connected to the outer circumferential surface of the reciprocating screw. The cleaning brush slides back and forth along the axis of the reciprocating screw, and the cleaning end of the cleaning brush presses against the surface of the filter screen and scrapes off the impurities adhering to the surface of the filter screen.

[0020] By adopting the above technical solution, when the reciprocating screw rotates, it drives the cleaning brush to slide back and forth along the axis of the reciprocating screw. The cleaning end of the cleaning brush presses against the filter screen surface and scrapes off the impurities adhering to the filter screen surface, thereby achieving directional cleaning of the filter screen surface.

[0021] Optionally, the reciprocating screw axis and the active impeller rotation axis are perpendicular to each other. The cleaning assembly also includes a first bevel gear, a second bevel gear, a transmission rod, and an insert. The transmission rod is rotatably connected to the inner wall of the tower body, and the rotation axis of the transmission rod coincides with the rotation axis of the active impeller. The insert is connected to the end face of the transmission rod facing the active impeller. The surface of the filter packing has a slide for the insert to pass through. The rotation axis of the active impeller has a groove for the insert to be embedded in. The active impeller drives the transmission rod to rotate through the insert. The second bevel gear is coaxially connected to the end face of the reciprocating screw near the transmission rod. The third bevel gear is coaxially connected to the end face of the transmission rod facing the first bevel gear. The first bevel gear meshes with the second bevel gear.

[0022] By adopting the above technical solution, the insert is embedded in the groove, and the outer circumference of the insert abuts against the inner wall of the groove to form a limit, realizing the coaxial connection between the active impeller and the transmission rod. The first bevel gear meshes with the second bevel gear, and the active impeller drives the reciprocating screw to rotate through the transmission rod, the first bevel gear and the second bevel gear. There is no need for an external power device to drive the reciprocating screw to rotate, which further reduces energy consumption and thus reflects the concept of energy saving.

[0023] Optionally, the cleaning assembly further includes a float, a connecting rod, and a transmission ring. The transmission rod has a groove on its surface for the sliding of an insert. The sliding direction of the insert is parallel to the axis of the transmission rod. The inner wall of the tower has a moving groove for the float to slide between the filter packing and the filter screen. The sliding direction of the float is parallel to the sliding direction of the insert. The outer circumferential surface of the insert has a rotating ring groove for the inner ring of the transmission ring to be embedded in. One end of the connecting rod is rotatably connected to the surface of the float, and the other end of the connecting rod is rotatably connected to the outer circumferential surface of the transmission ring. When the surface of the filter screen is blocked and the reaction liquid accumulates on the surface of the filter screen, the reaction liquid drives the float to move along the inner wall of the moving groove towards the filter packing. The connecting rod receives the power of the float and drives the insert to slide along the inner wall of the groove towards the embedding groove through the transmission ring. The end of the insert is embedded in the embedding groove.

[0024] By adopting the above technical solution, when the filter screen is clogged, the reaction liquid accumulates on the filter screen through the filter packing, the liquid level on the filter screen rises, and the float moves along the inner wall of the moving groove towards the filter packing due to the buoyancy of the reaction liquid. The connecting rod receives the power of the float and drives the insert to slide along the inner wall of the sliding groove towards the insert through the transmission ring. The end of the insert passes through the sliding track and is embedded in the insert. The outer circumference of the insert presses against the inner wall of the insert to form a limit, driving the reciprocating screw to rotate, realizing the directional start of the reciprocating screw, reducing the wear on bevel gear one and bevel gear two, thereby extending the service life of the paper deodorization equipment.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The spray tower is installed to further dissolve trace amounts of hydrogen sulfide, ammonia, and other volatile organic compounds that have not fully reacted during acid and alkali washing, thus preventing the exhaust gas from containing irritating gases, ensuring that the final exhaust gas meets the standards, reducing damage to air quality, and thus ensuring the stability of the lives of surrounding residents. 2. The arrangement of the tower body, air inlet pipe, air outlet pipe, liquid inlet pipe, liquid outlet pipe, filter packing and nozzles ensures that the liquid sprayed from the nozzles fully contacts and reacts with the waste gas in the inner cavity of the tower, increasing the contact time between the waste gas and the liquid, thereby improving the reaction efficiency between the waste gas and the liquid. 3. The guide pipe is designed so that the exhaust gas enters the tower body through the inlet pipe, then through the guide pipe and the inlet channel in sequence, and finally enters the tower body through the outlet hole. After impacting the reaction liquid, the exhaust gas passes through the filter packing and is discharged through the outlet pipe. The exhaust gas is discharged after being fully contacted with the reaction liquid three times, thereby improving the deodorization efficiency of the exhaust gas. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0027] Figure 2 This is a cross-sectional view of the spray tower in an embodiment of this application.

[0028] Figure 3 yes Figure 2 The enlarged view at point A in the middle mainly shows the cleanup components.

[0029] Explanation of reference numerals in the attached drawings: 1. Spray tower; 11. Tower body; 111. Inlet air passage; 112. Outlet air hole; 113. Moving trough; 12. Inlet air pipe; 13. Outlet air pipe; 14. Inlet liquid pipe; 15. Drain liquid pipe; 2. Filter packing; 21. Slide rail; 3. Nozzle; 4. Guide assembly; 41. Guide pipe; 42. Filter screen; 421. Clearance hole; 43. One-way valve; 5. Agitator assembly; 51. Agitator impeller; 52. Drive impeller; 521. Groove; 53. Synchronous pulley; 54. Synchronous belt; 6. Cleaning assembly; 61. Cleaning brush; 62. Reciprocating screw; 63. Bevel gear one; 64. Bevel gear two; 65. Transmission rod; 651. Slide rail; 66. Insert block; 661. Rotating ring groove; 67. Float; 68. Connecting rod; 69. Transmission ring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a papermaking deodorization device. (Refer to...) Figure 1The papermaking deodorization equipment includes multiple spray towers 1 connected in sequence. In this embodiment, there are three spray towers 1. The waste gas passes through the three spray towers 1 in sequence for acid washing, alkali washing, and water washing. In the acid washing stage, ammonia reacts with the acidic solution to produce soluble ammonium salts. In the alkali washing stage, hydrogen sulfide reacts with the alkaline solution to generate sulfide precipitates or soluble salts. Finally, the waste gas enters the water washing stage to further dissolve trace amounts of hydrogen sulfide, ammonia, and other volatile organic compounds that were not completely reacted during the acid and alkali washing stages. This prevents the discharged waste gas from containing irritating gases, ensures that the final discharged waste gas meets the standards, reduces damage to air quality, and thus ensures the stability of the lives of surrounding residents.

[0032] Reference Figure 2 and Figure 3 The spray tower 1 includes a tower body 11, an air inlet pipe 12, an air outlet pipe 13, a liquid inlet pipe 14, a liquid outlet pipe 15, filter media 2, and multiple nozzles 3. The bottom of the tower body 11 abuts against the ground to form a support. The liquid inlet pipe 14 and the liquid outlet pipe 15 are fixed at both ends of the tower body 11 in the height direction by flanges. Both the liquid inlet pipe 14 and the liquid outlet pipe 15 are connected to the inner cavity of the tower body 11. The liquid outlet pipe 15 is located on the side of the liquid inlet pipe 14 that is closer to the ground. In this embodiment, a pump body is connected between the liquid outlet pipe 15 and the liquid inlet pipe 14. The pump body can drive the reaction liquid in the tower body 11 to enter the liquid inlet pipe 14 through the liquid outlet pipe 15, so as to realize the reuse of the reaction liquid, reduce the consumption of the reaction liquid, and thus reflect the concept of environmental protection.

[0033] Reference Figure 2 and Figure 3 Multiple nozzles 3 are fixed at intervals on the surface of the liquid inlet pipe 14 facing the filter packing 2. The liquid in the liquid inlet pipe 14 is sprayed into the inner cavity of the tower body 11 through the multiple nozzles 3. In this embodiment, the material of the filter packing 2 is sponge. The filter packing 2 is fixed on the inner wall of the tower body 11. The filter packing 2 is located between the liquid inlet pipe 14 and the liquid outlet pipe 15. The liquid outlet end of the nozzle 3 faces the surface of the filter packing 2. The reaction liquid is sprayed out through the nozzle 3 and wets the filter packing 2 before accumulating on the bottom wall of the tower body 11.

[0034] Reference Figure 2 and Figure 3 The inlet pipe 12 and the outlet pipe 13 are installed at both ends of the tower body 11 in the height direction through flanges. Both the inlet pipe 12 and the outlet pipe 13 are connected to the inner cavity of the tower body 11. The inlet pipe 12 is located on the side of the outlet pipe 13 that is closer to the ground. The inlet pipe 12 is located between the liquid inlet pipe 14 and the liquid outlet pipe 15. The exhaust gas enters the inner cavity of the tower body 11 through the inlet pipe 12 and is discharged from the outlet pipe 13 through the filter packing 2. The reaction liquid comes into full contact with the exhaust gas and reacts, thereby improving the deodorization efficiency of the exhaust gas.

[0035] Reference Figure 2 and Figure 3 The tower body 11 is equipped with a guide assembly 4, which guides the flow direction of exhaust gas within the inner cavity of the tower body 11. The guide assembly 4 includes a guide pipe 41, a filter screen 42, and multiple one-way valves 43. An inlet channel 111 is provided on the bottom wall of the tower body 11, and multiple outlet holes 112 are spaced apart on the inner wall of the inlet channel 111. The outlet holes 112 connect the inlet channel 111 and the inner cavity of the tower body 11. The one-way valves 43 correspond one-to-one with the outlet holes 112 and are installed on the inner wall of the outlet holes 112. The one-way valves 43 supply the exhaust gas into the outlet holes 112. The exhaust gas enters the inner cavity of the tower body 11. One end of the guide pipe 41 is fixed to the inner wall of the tower body 11 facing the air inlet pipe 12 through a flange. The other end of the guide pipe 41 is embedded in the inner wall of the air inlet channel 111. The guide pipe 41 connects the air inlet channel 111 and the air inlet pipe 12. The exhaust gas passes through the air inlet pipe 12, then through the guide pipe 41, the air inlet channel 111, and the one-way valve 43, and enters the inner cavity of the tower body 11 through the outlet 112 and impacts the reaction liquid. The exhaust gas and the reaction liquid come into full contact and react, thereby further improving the deodorization efficiency of the exhaust gas.

[0036] Reference Figure 2 and Figure 3 The filter screen 42 is fixed to the inner wall of the tower body 11. The filter screen 42 is located between the air inlet pipe 12 and the liquid outlet pipe 15. The filter screen 42 has a clearance hole 421 for the guide pipe 41 to pass through. The reaction liquid that seeps out of the filter packing 2 is filtered by the filter screen 42 and accumulates on the bottom wall of the tower body 11, so that the reaction liquid is less likely to carry impurities and block the one-way valve 43, thereby improving the stability of the operation of the one-way valve 43.

[0037] Reference Figure 2 and Figure 3 The tower body 11 is equipped with a stirring assembly 5, which can agitate the reaction liquid sprayed from the nozzle 3, prolonging the residence time of the reaction liquid in the inner cavity of the tower body 11, so that the waste gas and the reaction liquid can fully contact and react. The stirring assembly 5 includes a stirring impeller 51, a driving impeller 52, at least two synchronous wheels 53, and a synchronous belt 54 used in conjunction with the synchronous wheels 53. The stirring impeller 51 is rotatably connected to the inner wall of the tower body 11, and the rotation axis of the stirring impeller 51 is parallel to the axis of the tower body 11. The stirring impeller 51 is located between the nozzle 3 and the filter packing 2. The stirring impeller 51 rotates and drives the reaction liquid sprayed from the nozzle 3 to agitate in the inner cavity of the tower body 11, prolonging the residence time of the reaction liquid in the inner cavity of the tower body 11.

[0038] Reference Figure 2 and Figure 3The active impeller 52 is rotatably connected to the inner wall of the tower body 11 near the outlet pipe 13. When the exhaust gas in the tower body 11 enters the inner cavity of the outlet pipe 13, it impacts the blades of the active impeller 52 and drives the active impeller 52 to rotate. The rotation axis of the active impeller 52 and the rotation axis of the stirring impeller 51 are parallel to each other. One synchronous wheel 53 is coaxially fixed on the rotation axis of the active impeller 52, and the other synchronous wheel 53 is coaxially fixed on the rotation axis of the stirring impeller 51. The synchronous belt 54 tensions and connects the two synchronous wheels 53. The active impeller 52 drives the stirring impeller 51 to rotate through the synchronous belt 54 and the synchronous wheels 53. No external power device is needed to drive the stirring impeller 51 to rotate, reducing energy consumption and thus embodying the concept of energy saving.

[0039] Reference Figure 2 and Figure 3 The tower body 11 is equipped with a cleaning assembly 6, which can directionally clean impurities on the surface of the filter screen 42. The cleaning assembly 6 includes a cleaning brush 61, a reciprocating screw 62, a first bevel gear 63, a second bevel gear 64, a transmission rod 65, an insert 66, a float 67, a connecting rod 68, and a transmission ring 69. The reciprocating screw 62 is rotatably connected to the inner wall of the tower body 11. The rotation axis of the reciprocating screw 62 is perpendicular to the rotation axis of the active impeller 52. The reciprocating screw 62 is located between the filter packing 2 and the filter screen 42. The cleaning brush 61 is threadedly connected to the outer circumference of the reciprocating screw 62. The cleaning brush 61 slides back and forth along the axis of the reciprocating screw 62, and the cleaning end of the cleaning brush 61 presses against the surface of the filter screen 42 and scrapes off the impurities adhering to the surface of the filter screen 42, thereby achieving directional cleaning of the surface of the filter screen 42.

[0040] Reference Figure 2 and Figure 3 The transmission rod 65 is rotatably connected to the inner wall of the tower body 11. The rotation axis of the transmission rod 65 coincides with the rotation axis of the active impeller 52. The end face of the transmission rod 65 facing the rotation axis of the active impeller 52 is provided with a groove 651 for the insert 66 to slide. The sliding direction of the insert 66 is parallel to the axis of the transmission rod 65. The end face of the active impeller 52 facing the insert 66 is provided with a groove 521 for the end of the insert 66 to be embedded. The surface of the filter packing 2 is provided with a slide 21 for the insert 66 to pass through.

[0041] Reference Figure 2 and Figure 3 The first bevel gear 63 is coaxially fixed at the end of the reciprocating screw 62 near the transmission rod 65, and the second bevel gear 64 is coaxially fixed at the end of the transmission rod 65 near the first bevel gear 63. The first bevel gear 63 meshes with the second bevel gear 64. The driving impeller 52 drives the reciprocating screw 62 to rotate around its own axis through the insert 66, the transmission rod 65, the first bevel gear 63 and the second bevel gear 64. No external power device is required to drive it, reducing energy consumption and thus embodying the concept of energy saving.

[0042] Reference Figure 2 and Figure 3 The inner wall of the tower body 11 is provided with a moving groove 113 for the float 67 to slide. The sliding direction of the float 67 is parallel to the sliding direction of the insert 66. The moving groove 113 is located between the filter packing 2 and the filter screen 42. The outer circumferential surface of the insert 66 is provided with a rotating ring groove 661 for the inner ring of the transmission ring 69 to be embedded. One end of the connecting rod 68 is rotatably connected to the end of the float 67 that protrudes from the inner wall of the tower body 11, and the other end of the connecting rod 68 is rotatably connected to the outer ring wall of the transmission ring 69.

[0043] Reference Figure 2 and Figure 3 When the filter screen 42 becomes clogged and the reaction liquid accumulates on the filter screen 42, the liquid level on the filter screen 42 rises. The float 67, under the buoyancy of the reaction liquid, moves along the inner wall of the moving groove 113 towards the filter packing 2. The connecting rod 68 receives the power from the float 67 and drives the insert 66 to slide along the inner wall of the slide groove 651 towards the insert groove 521 through the transmission ring 69. The end of the insert 66 passes through the slide 21 and is embedded in the insert groove 521. The outer circumference of the insert 66 presses against the inner wall of the insert groove 521 to form a limit, driving the reciprocating screw 62 to rotate, realizing the directional start of the reciprocating screw 62, reducing the wear on the bevel gear 1 63 and bevel gear 2 64, thereby extending the service life of the paper deodorization equipment.

[0044] The implementation principle of a papermaking deodorization device according to an embodiment of this application is as follows: the waste gas passes through three spray towers 1 and undergoes acid washing, alkali washing, and water washing in sequence. In the acid washing stage, ammonia reacts with the acidic solution to produce soluble ammonium salts. In the alkali washing stage, hydrogen sulfide reacts with the alkaline solution to generate sulfide precipitates or soluble salts. Finally, the waste gas enters the water washing stage to further dissolve trace amounts of hydrogen sulfide, ammonia, and other volatile organic compounds that were not completely reacted during the acid and alkali washing stages. This prevents the discharged waste gas from containing irritating gases, ensures that the final discharged waste gas meets the standards, reduces damage to air quality, and thus ensures the stability of the lives of surrounding residents.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. Papermaking deodorizing apparatus, characterized by: It includes multiple spray towers (1) connected in sequence, and the multiple spray towers (1) sequentially perform acid washing, alkali washing and water washing on the waste gas.

2. The papermaking deodorizing apparatus according to claim 1, characterized by: The spray tower (1) includes a tower body (11), an air inlet pipe (12), an air outlet pipe (13), a liquid inlet pipe (14), a liquid outlet pipe (15), filter media (2), and multiple nozzles (3). The liquid inlet pipe (14) and the liquid outlet pipe (15) are connected at intervals at both ends of the tower body (11) in the height direction. Both the liquid inlet pipe (14) and the liquid outlet pipe (15) are connected to the inner cavity of the tower body (11). The filter media (2) is connected to the inner wall of the tower body (11) and is located between the liquid inlet pipe (14) and the liquid outlet pipe (15). The multiple nozzles (3) are connected at intervals. The liquid in the inlet pipe (14) is connected to the surface of the filter packing (2). The liquid in the inlet pipe (14) is sprayed onto the surface of the filter packing (2) through the nozzle (3). The inlet pipe (12) and the outlet pipe (13) are connected at intervals at both ends of the tower body (11) in the height direction. The inlet pipe (12) and the outlet pipe (13) are both connected to the inner cavity of the tower body (11). The filter packing (2) is located between the inlet pipe (12) and the outlet pipe (13). The exhaust gas enters the inner cavity of the tower body (11) through the inlet pipe (12) and is discharged from the outlet pipe (13) through the filter packing (2).

3. The papermaking deodorizing apparatus according to claim 2, characterized by: The tower body (11) is connected to a guide assembly (4), which includes a guide tube (41). The bottom wall of the tower body (11) is provided with an air inlet channel (111). The inner wall of the air inlet channel (111) is provided with a plurality of air outlet holes (112) spaced apart. The air outlet holes (112) connect the air inlet channel (111) and the inner cavity of the tower body (11). One end of the guide tube (41) is connected to the inner wall of the tower body (11) facing the air inlet pipe (12). The other end of the guide tube (41) is embedded in the inner wall of the air inlet channel (111). The guide tube (41) connects the air inlet channel (111) and the air inlet pipe (12). The exhaust gas passes through the air inlet pipe (12), the guide tube (41), the air inlet channel (111), and enters the inner cavity of the tower body (11) through the air outlet holes (112).

4. The papermaking deodorizing apparatus according to claim 3, characterized by: The guide assembly (4) also includes multiple one-way valves (43), each one-way valve (43) corresponding to an outlet (112) and connected to the inner wall of the outlet (112). The one-way valve (43) supplies the exhaust gas in the outlet (112) into the inner cavity of the tower body (11).

5. The papermaking deodorizing apparatus according to claim 3, characterized by: The guide assembly (4) also includes a filter screen (42), which is connected to the inner cavity of the tower body (11). The filter screen (42) is located between the air inlet pipe (12) and the liquid outlet pipe (15). The filter screen (42) has a clearance hole (421) for the guide pipe (41) to pass through. The reaction liquid in the filter packing (2) is filtered by the filter screen (42) and then accumulates on the bottom wall of the tower body (11).

6. The papermaking deodorizing apparatus according to claim 5, characterized by: The tower body (11) is connected to a stirring assembly (5), which includes a stirring impeller (51). The stirring impeller (51) is rotatably connected to the inner wall of the tower body (11). The stirring impeller (51) is located between the nozzle (3) and the filter packing (2). The stirring impeller (51) rotates and drives the reaction liquid sprayed from the nozzle (3) to swirl in the inner cavity of the tower body (11).

7. The papermaking deodorizing apparatus according to claim 6, characterized by: The stirring assembly (5) includes an active impeller (52), at least two synchronous pulleys (53), and a synchronous belt (54) used in conjunction with the synchronous pulleys (53). The active impeller (52) is rotatably connected to the inner wall of the tower body (11) near the exhaust pipe (13). When the exhaust gas in the tower body (11) enters the exhaust pipe (13), it impacts the blades of the active impeller (52) and drives the active impeller (52) to rotate. The rotation axis of the active impeller (52) and the rotation axis of the stirring impeller (51) are parallel to each other. One of the synchronous pulleys (53) is coaxially connected to the rotation axis of the active impeller (52), and the other synchronous pulley (53) is coaxially connected to the rotation axis of the stirring impeller (51). The synchronous belt (54) tensions and connects the two synchronous pulleys (53).

8. The papermaking deodorization equipment according to claim 7, characterized in that: The tower body (11) is connected to a cleaning assembly (6), which includes a cleaning brush (61) and a reciprocating screw (62). The reciprocating screw (62) is rotatably connected to the inner wall of the tower body (11) and is located between the filter packing (2) and the filter screen (42). The cleaning brush (61) is threadedly connected to the outer circumferential surface of the reciprocating screw (62). The cleaning brush (61) slides back and forth along the axis of the reciprocating screw (62), and the cleaning end of the cleaning brush (61) presses against the surface of the filter screen (42) and scrapes off the impurities adhering to the surface of the filter screen (42).

9. The papermaking deodorizing apparatus according to claim 8, characterized by: The axis of the reciprocating screw (62) is perpendicular to the axis of rotation of the active impeller (52). The cleaning assembly (6) also includes a first bevel gear (63), a second bevel gear (64), a transmission rod (65), and an insert (66). The transmission rod (65) is rotatably connected to the inner wall of the tower body (11). The axis of rotation of the transmission rod (65) coincides with the axis of rotation of the active impeller (52). The insert (66) is connected to the end face of the transmission rod (65) facing the active impeller (52). The filter packing (2) has openings on its surface. The slide (21) through which the insert (66) passes is provided. The rotating shaft of the active impeller (52) has a groove (521) for the insert (66) to be inserted. The active impeller (52) drives the transmission rod (65) to rotate through the insert (66). The first bevel gear (63) is coaxially connected to the end face of the reciprocating screw (62) near the transmission rod (65). The second bevel gear (64) is coaxially connected to the end face of the transmission rod (65) facing the first bevel gear (63). The first bevel gear (63) meshes with the second bevel gear (64).

10. The papermaking deodorization equipment according to claim 9, characterized in that: The cleaning assembly (6) also includes a float (67), a connecting rod (68), and a transmission ring (69). The transmission rod (65) has a groove (651) on its surface for sliding of the insert (66). The sliding direction of the insert (66) is parallel to the axis of the transmission rod (65). The inner wall of the tower body (11) has a moving groove (113) for sliding of the float (67). The moving groove (113) is located between the filter packing (2) and the filter screen (42). The sliding direction of the float (67) is parallel to the sliding direction of the insert (66). The outer circumferential surface of the insert (66) has a rotating ring for the inner ring of the transmission ring (69) to be embedded in. The groove (661) has one end of the connecting rod (68) rotatably connected to the surface of the float (67) and the other end of the connecting rod (68) rotatably connected to the outer circumference of the transmission ring (69). When the surface of the filter screen (42) is blocked and the reaction liquid accumulates on the surface of the filter screen (42), the reaction liquid drives the float (67) to move along the inner wall of the moving groove (113) toward the direction close to the filter packing (2). The connecting rod (68) receives the power of the float (67) and drives the insert (66) to slide along the inner wall of the sliding groove (651) toward the direction close to the insert groove (521) through the transmission ring (69). The end of the insert (66) is embedded in the insert groove (521).

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