NMP waste gas return air treatment process

Abstract

The invention belongs to the technical field of NMP waste gas treatment, and particularly relates to an NMP waste gas return air treatment process which comprises a spray tower used for spraying and absorbing impurities mixed in introduced NMP waste gas, the lower portion of one side of the spray tower is communicated with a gas inlet channel, the top of the spray tower is communicated with a gas outlet channel, and a waste liquid collecting bin is formed at the bottom of the spray tower; the spraying mechanism is communicated with a water tank below one side of the spraying tower through a water supply pipe and is used for uniformly spraying liquid in the water tank into the spraying tower to be in contact with the introduced NMP waste gas for absorption; the filler adjusting mechanism is positioned below the spraying mechanism and is used for adjusting the loose and uniform degree of the filler balls filled in the filler cavity; by changing the flowing speed and the flowing direction of the entering waste gas in the filler cavity, the sufficient contact between water mist sprayed by the spraying mechanism and the entering waste gas can be adjusted, so that the sufficient filtering and washing effect on impurities such as particle residues or dust in the waste gas can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of NMP waste gas treatment, and in particular relates to a NMP waste gas return air treatment process. Background Art

[0002] N-Methylpyrrolidone, or NMP, is an important chemical raw material. It is a polar solvent with strong selectivity and good stability. It is also a commonly used solvent in the production process of lithium batteries. In the production process of lithium batteries, NMP is often used as a solvent when making positive and negative electrode materials and lithium battery separators. During the production process, with the production of positive and negative electrode materials and separators of lithium batteries, the NMP solvent used continues to evaporate and will be discharged with the waste gas. Waste gas containing NMP has certain toxicity and cannot be directly discharged into the environment. It needs to be recycled before it can be discharged.

[0003] The existing methods for treating the return air of NMP waste gas are mostly to perform heat exchange and cooling treatment on the NMP waste gas through a heat exchange system, and then pass it into a spray tower for spray filtration treatment. In order to allow the sprayed water mist to fully absorb the particulate matter, dust and other impurities mixed in the incoming waste gas, most of them are filled with filter layers in the spray tower, and the filling filter layer is filled with filler balls and other materials. However, since the filler balls filled in the filling filter layer are mostly in a static state and cannot be adjusted to their loose uniformity, it is easy to cause the filler balls to fail to fully and evenly drive the sprayed water mist to fully contact with the incoming waste gas, which not only affects the effect of waste gas cooling, but also makes it difficult to fully filter and wash away the particulate residues or dust and other impurities in the waste gas. Summary of the invention

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention discloses a NMP waste gas return air treatment process, comprising a spray tower for spraying and absorbing impurities mixed in the introduced NMP waste gas, wherein an air inlet channel is connected to the lower part of one side of the spray tower, and an air outlet channel is connected to the top of the spray tower, and a waste liquid collection bin is formed at the bottom of the spray tower; a spray mechanism is connected to a water tank at the lower part of one side of the spray tower through a water supply pipe, and is used for uniformly spraying the liquid in the water tank into the spray tower for contact and absorption with the introduced NMP waste gas; and a filler adjustment mechanism is located below the spray mechanism and is used for adjusting the looseness and uniformity of filler balls filled in the filler cavity.

[0006] Furthermore, the filler adjustment mechanism includes a filter screen, an elastic pipe network, a mesh cover, a rotating shaft rod, blades, a supporting screw, a screw nut, a limiting ring and a magnetic ring. The filter screen is fixedly installed inside the spray tower, and the upper surface of the filter screen is connected to the elastic pipe network. The outer wall of the elastic pipe network is in close contact with the inner wall of the spray tower. The upper end of the elastic pipe network is connected to the mesh cover. The center of the filter screen is rotatably installed with a rotating shaft rod through a bearing, and a plurality of blades are fixed to the bottom end of the rotating shaft rod extending downward, and the plurality of blades are located Above the air inlet passage, the upper end face of the rotating shaft rod is connected to a supporting screw, and the top end portion of the supporting screw extends upward out of the center hole of the mesh disk cover, a screw nut is sleeved on the supporting screw, and a limiting ring is insulated and sleeved on the outer ring surface of the screw nut, the limiting ring is located in an annular cavity opened on the inner wall of the center hole of the mesh disk cover, a magnetic ring is insulated and fixed on the inner wall of the annular cavity, and the magnetic ring is sleeved on the outer ring surface of the limiting ring, a filling cavity is formed between the filter net, the elastic pipe net and the mesh disk cover, and the filling cavity is filled with filler balls.

[0007] Furthermore, a plurality of scrapers are installed in a circular array on the outer ring surface of the rotating shaft rod, and the plurality of scrapers are in close contact with the lower surface of the filter screen, the top end of the rotating shaft rod is connected to a sleeve, and a supporting screw is inserted into the connecting sleeve, and an electromagnetic suction cup is insulated and installed on the bottom of the connecting sleeve, and the electromagnetic suction cup is insulated and contacts with a metal block installed at the bottom end of the supporting screw.

[0008] Furthermore, the double-layer spray mechanism is laid in the spray tower, including a cavity ring, a spray pipe, a nozzle, a diverter pipe, a connecting pipe, a connecting hose and a supporting column. The upper and lower cavity rings are arranged at the center of the spray tower, and the outer ring surface of the cavity ring is connected to a plurality of spray pipes in a circular array, and each spray pipe is connected to a plurality of nozzles. At least two diverter pipes are connected to the pipe wall of the water supply pipe, and the two diverter pipes are fixed to the tower body of the spray tower. The diverter pipe located above is connected to one of the spray pipes above through a connecting pipe, and the diverter pipe located below is connected to one of the spray pipes below through a connecting hose. The plurality of spray pipes located above are fixedly supported to the tower body of the spray tower through a plurality of supporting columns, and a torsion adjustment assembly is provided at the cavity ring located below.

[0009] Furthermore, the torsion adjustment assembly includes a torsion rod, a torsion spring, a support ring, a magnetic block and a sleeve. The torsion rod is inserted into the cavity ring located below, and the torsion rod and the cavity ring are connected by a torsion spring. The support ring made of metal is insulated and sleeved on the ends of multiple spray pipes located in the lower layer. The inner wall of the spray tower is insulated and installed with multiple magnetic blocks, and the multiple magnetic blocks are in contact with the outer ring surface of the support ring. The sleeve is fixed to the top end of the support screw, and the torsion rod is inserted into the sleeve. The bottom of the sleeve is also insulated and installed with an electromagnetic suction cup, and the electromagnetic suction cup is insulated and installed with a metal block in contact with the bottom end of the torsion rod.

[0010] Furthermore, the torsion adjustment assembly also includes a connecting rod and a limiting swivel, the top end of the torsion rod extends upward from the cavity ring, and the outer ring surface of the top end is connected to at least two connecting rods, at least two of the connecting rods are connected to the inner ring surface of the limiting swivel, the outer ring surface of the limiting swivel is flush with the outer ring surface of the support ring, and the outer ring surface of the limiting swivel is also in close contact with multiple segmented magnetic blocks.

[0011] Furthermore, a plurality of toggle rods are connected to the outer circumferential array of the connecting sleeve, and the plurality of toggle rods are located in the elastic pipe network.

[0012] Furthermore, a demister is installed above the interior of the spray tower, and the demister is located above the upper spray pipe.

[0013] The present invention has the following beneficial effects:

[0014] 1. The present invention sets a packing adjustment mechanism below the spray mechanism, and the support screw is detachably connected to the rotating shaft rod, and the plurality of blades are driven to rotate the rotating shaft rod by the exhaust gas flowing upward, so that the support screw can drive the elastic pipe network to stretch through the screw nut, or the elastic pipe network can shrink due to its own elastic restoring force, so as to adjust the cavity volume of the packing cavity, so that the packing balls filled inside can be evenly or loosely dispersed in the packing cavity, so as to change the flow speed and flow direction of the incoming exhaust gas in the packing cavity, and thus adjust the sufficiency of the contact between the water mist sprayed by the spray mechanism and the incoming exhaust gas, so as to improve the filtration and washing effect of particulate residues or impurities such as dust in the exhaust gas.

[0015] 2. The present invention fixes and installs the multiple spray pipes located on the upper layer, and connects the multiple spray pipes located on the lower layer through a torsion adjustment assembly, so that when the multiple blades drive the rotating shaft rod to rotate, the torsion rod can drive the multiple spray pipes on the lower layer to twist at a certain angle through the torsion spring, so that the multiple spray pipes on the upper layer and the multiple spray pipes on the lower layer are in a torsion misalignment state, thereby increasing the area of ​​water mist sprayed by the multiple nozzles on the upper and lower layers, so that the incoming exhaust gas can be in contact with the sprayed water mist over a sufficiently large area, thereby further improving the filtering and washing treatment of impurities in the exhaust gas.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure disclosed in the present invention;

[0019] Figure 2 It is a schematic diagram of the internal structure of the spray tower disclosed in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the torsion adjustment assembly disclosed in the present invention;

[0021] Figure 4 It is a structural schematic diagram of the filler adjustment mechanism disclosed in the present invention;

[0022] Figure 5 It is a cross-sectional view of the elastic pipe network disclosed in the present invention.

[0023] In the figure: 1, spray tower; 2, air inlet channel; 3, air outlet channel; 4, waste liquid collection chamber; 5, spray mechanism; 51, cavity ring; 52, spray pipe; 53, nozzle; 54, diverter pipe; 55, connecting pipe; 56, connecting hose; 57, support column; 58, water supply pipe; 6, water tank; 7, filler adjustment mechanism; 71, filter screen; 72, elastic pipe network; 721, filling cavity; 73, mesh cover; 74, rotating Shaft; 741, connecting sleeve; 742, electromagnetic suction cup; 75, blade; 76, supporting screw; 77, screw nut; 78, limiting ring; 79, magnetic ring; 791, scraper; 8, torsion adjustment assembly; 81, torsion rod; 82, torsion spring; 83, supporting ring; 84, magnetic block; 85, sleeve tube; 86, connecting rod; 87, limiting swivel; 88, toggle rod; 9, defogger; 10, packing ball. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] See also Figure 1-Figure 5 As shown, the present invention is a NMP waste gas return air treatment process, comprising a spray tower 1, which is used for spraying and absorbing impurities mixed in the introduced NMP waste gas, wherein the spray tower 1 is connected with an air inlet channel 2 at the bottom of one side, and is connected with an air outlet channel 3 at the top, and a waste liquid collection bin 4 is formed at the bottom of the spray tower 1; a spray mechanism 5, which is connected with a water tank 6 at the bottom of one side of the spray tower 1 through a water supply pipe 58, and is used for uniformly spraying the liquid in the water tank 6 into the spray tower 1 to contact and absorb the introduced NMP waste gas; a packing adjustment mechanism 7, which is located below the spray mechanism 5, and is used for adjusting the looseness and uniformity of the packing balls 10 filled in the packing cavity;

[0027] Specifically, the present invention is provided with a packing adjustment mechanism 7 below the spray mechanism 5. When the NMP waste gas enters the spray tower 1 through the air inlet channel 2, the packing adjustment mechanism 7 can adjust the size of the packing cavity so that the packing balls 10 of corrosion-resistant material filled therein, such as PP balls, ball rings and other packing balls 10, can be in a loose state and a uniformly laid state, and can also be adjusted to a contact interval between adjacent packing balls 10, so that the flow speed and flow direction of the incoming waste gas in the packing cavity can be changed, and then the sufficiency of the contact between the water mist sprayed by the spray mechanism 5 and the incoming waste gas can be adjusted, so as to improve the filtering and washing effect of impurities such as particulate residues or dust in the waste gas, and the sprayed and settled waste water will fall into the waste liquid collection bin 4 below, and the filtered and washed waste gas will flow upward and be discharged through the air outlet channel 3, and the waste liquid collected in the waste liquid collection bin 4 will be filtered and treated by the water tank 6, and then injected into the water supply pipe 58 by the water pump, and then circulated to the spray mechanism 5 for spraying water mist dust reduction treatment.

[0028] In this embodiment, the filler adjustment mechanism 7 includes a filter screen 71, an elastic pipe network 72, a mesh cover 73, a rotating shaft rod 74, blades 75, a support screw 76, a screw nut 77, a limit ring 78 and a magnetic ring 79. The filter screen 71 is fixedly installed inside the spray tower 1, and the upper surface of the filter screen 71 is connected to the elastic pipe network 72. The outer pipe wall of the elastic pipe network 72 is in close contact with the inner wall of the spray tower 1. The upper end of the elastic pipe network 72 is connected to the mesh cover 73. The center of the filter screen 71 is rotatably installed with a rotating shaft rod 74 through a bearing, and the bottom end of the rotating shaft rod 74 extending downward is fixed with a plurality of blades 75. The plurality of blades 75 Located above the air inlet passage 2, the upper end surface of the rotating shaft rod 74 is connected to a supporting screw 76, and the top end of the supporting screw 76 extends upwardly out of the center hole of the mesh cover 73, and a screw nut 77 is sleeved on the supporting screw 76, and a limiting ring 78 is insulated and sleeved on the outer ring surface of the screw nut 77, and the limiting ring 78 is located in an annular cavity opened on the inner wall of the center hole of the mesh cover 73, and a magnetic ring 79 is insulated and fixed on the inner wall of the annular cavity, and the magnetic ring 79 is sleeved on the outer ring surface of the limiting ring 78, and a filling cavity 721 is formed between the filter screen 71, the elastic pipe net 72 and the mesh cover 73, and the filling cavity 721 is filled with filler balls 10;

[0029] Specifically, when it is necessary to increase the volume of the filling chamber 721 so that the filling balls 10 filled therein are in a loose state and the gaps between them are increased, the magnetic ring 79 can be controlled to absorb and fix the limit ring 78 so that the screw nut 77 can be connected to the mesh cover 73, and then the exhaust gas entering the spray tower 1 will push the multiple blades 75 on the shaft rod 74 to rotate, so that the support screw 76 can rotate through the shaft rod 74, and then the support screw 76 drives the mesh cover 73 to slide upward through the screw nut 77, and then the elastic pipe network 72 will be stretched, so that the cavity of the filling chamber 721 is enlarged, and the filling balls 10 in the filling chamber 721 will be in a loose state. The exhaust gas is in a dispersed state, so that the incoming exhaust gas can flow quickly in the filling chamber 721, thereby accelerating the spray tower 1 to fully filter and wash the particulate residue or dust and other impurities in the exhaust gas. Since the exhaust gas is continuously introduced, when the elastic pipe network 72 is pulled upward to a certain height, the magnetic suction ring 79 is controlled to be powered off, and the magnetic adsorption of the limit ring 78 is separated, so that the support screw 76 will drive the screw nut 77 and the limit ring 78 to rotate in the annular cavity, and the rotation of the multiple blades 75 will drive the incoming exhaust gas to generate turbulent flow in the spray tower 1, thereby further improving the effect of filtering and washing the flowing exhaust gas by the water mist sprayed by the spray mechanism 5.

[0030] In this embodiment, a plurality of scrapers 791 are installed in a circumferential array on the outer ring surface of the rotating shaft rod 74, and the plurality of scrapers 791 are in close contact with the lower surface of the filter screen 71. The top end of the rotating shaft rod 74 is connected to a sleeve 741, and a support screw 76 is inserted into the connecting sleeve 741. An electromagnetic suction cup 742 is insulated and installed at the bottom of the connecting sleeve 741, and the electromagnetic suction cup 742 is in contact with a metal block insulated and installed at the bottom end of the support screw 76.

[0031] Specifically, in order to improve the filtering and washing effect of the sprayed water mist on impurities in the exhaust gas, the electromagnetic suction cup 742 at the bottom of the connecting sleeve 741 can be controlled to disengage from the adsorption of the metal block at the bottom end of the supporting screw 76, so that the supporting screw 76 is disconnected from the rotating shaft rod 74, and when the magnetic suction ring 79 magnetically adsorbs the limiting ring 78, the mesh cover 73 is connected to the screw nut 77, and then the elastic restoring force of the elastic pipe network 72 will pull the screw nut 77 to move downward along the supporting screw 76, and at this time the supporting screw 76 will rotate in the opposite direction, thereby reducing the volume of the internal cavity of the filling cavity 721, so that the loose filler balls 10 can be evenly filled into the filling cavity 721, so that the solution sprayed by the spray mechanism 5 can form water mist and enter the evenly distributed filler balls 10, so that the exhaust gas flowing upward can Fully and efficiently contacting with the evenly dispersed water mist can not only effectively reduce the temperature of the organic waste gas, but also fully filter the organic waste gas, and fully filter and wash the particulate residues or dust and other impurities in the organic waste gas; and when it is necessary to increase the volume of the filling chamber 721, the magnetic adsorption force of the energized electromagnetic suction cup 742 will adsorb and fix the support screw 76 through the metal block, and then the rotating shaft rod 74 will be connected to the support screw 76 to achieve the stretching of the elastic pipe network 72; when the rotating shaft rod 74 is disconnected from the support screw 76 and continues to rotate, it will drive multiple scraping blades 791 to rotate on the lower surface of the filter net 71, so as to scrape and clean the particulate residues intercepted and adhered to the lower surface of the filter net 71, so as to prevent the particulate residues and other impurities from clogging the mesh of the filter net 71, thereby affecting the upward flow of the incoming exhaust gas. Filtering and washing effect.

[0032] In this embodiment, the double-layer spray mechanism 5 is laid in the spray tower 1, including a cavity ring 51, a spray pipe 52, a nozzle 53, a diversion pipe 54, a connecting pipe 55, a connecting hose 56 and a support column 57. The upper and lower cavity rings 51 are arranged at the center of the spray tower 1, and the outer ring surface of the cavity ring 51 is connected to a plurality of spray pipes 52 in a circular array, and each spray pipe 52 is connected to a plurality of nozzles 53. The wall of the water supply pipe 58 is connected to at least two A shunt pipe 54, and two shunt pipes 54 are fixed to the tower body of the spray tower 1, the shunt pipe 54 located at the top is connected to one of the spray pipes 52 at the top through a connecting pipe 55, and the shunt pipe 54 located at the bottom is connected to one of the spray pipes 52 at the bottom through a connecting hose 56, and the multiple spray pipes 52 located at the top are fixedly supported to the tower body of the spray tower 1 through multiple supporting columns 57, and a torsion adjustment component 8 is provided at the cavity ring 51 located at the bottom;

[0033] Specifically, the solution in the water tank 6 will be diverted to the connecting pipes 55 and the connecting hoses 56 of the upper and lower layers through the water pump, the water supply pipe 58 and the diversion pipe 54, and then enter the spray pipe 52. Since the multiple spray pipes 52 are connected through the cavity ring 51, the multiple circular array spray pipes 52 will spray the solution evenly and widely into the spray tower 1 through the multiple nozzles 53, so as to fully wash and filter the impurities in the exhaust gas. The torsion adjustment assembly 8 located below can drive the multiple spray pipes 52 below to axially twist, so that they are staggered with the multiple spray pipes 52 above, so as to further increase the area of ​​the multiple nozzles 53 spraying water mist in the spray tower 1; and the multiple support columns 57 can fix and support the multiple spray pipes 52 located above; one of the spray pipes 52 located below is connected to the diversion pipe 54 through the connecting hose 56, so that it will not interfere with the normal torsion and dislocation of the multiple spray pipes 52 below.

[0034] In this embodiment, the torsion adjustment assembly 8 includes a torsion rod 81, a torsion spring 82, a support ring 83, a magnetic block 84 and a sleeve 85. The torsion rod 81 is inserted into the cavity ring 51 located at the bottom, and the torsion rod 81 and the cavity ring 51 are connected by the torsion spring 82. The support ring 83 made of metal is insulated and sleeved on the ends of multiple spray pipes 52 located at the lower layer. The inner wall of the spray tower 1 is insulated and installed with multiple magnetic blocks 84, and the multiple magnetic blocks 84 are in contact with the outer ring surface of the support ring 83. The sleeve 85 is fixed to the top end of the support screw 76, and the torsion rod 81 is inserted into the sleeve 85. The bottom of the sleeve 85 is also insulated and installed with an electromagnetic suction cup 742, and the electromagnetic suction cup 742 is insulated and installed with a metal block in contact with the bottom end of the torsion rod 81.

[0035] Specifically, when the multiple spray pipes 52 located at the lower layer need to be twisted, the electromagnetic suction cup 742 in the control sleeve 85 will absorb and fix the twist rod 81, and the support screw 76 is connected to the shaft rod 74, and then the shaft rod 74 will drive the twist rod 81 to rotate through the support screw 76. At this time, the magnetic suction ring 79 and the limit ring 78 can be adsorbed and connected as needed, so that the elastic pipe network 72 stretches and stretches, and the rotation of the torsion rod 81 will drive the lower cavity ring 51 to rotate through the torsion spring 82, so that the axial rotation of the multiple spray pipes 52 located below is misaligned with the multiple spray pipes 52 above Then, the multiple magnetic blocks 84 are energized to adsorb and fix the support ring 83, so that the multiple spray pipes 52 that are axially rotated and misaligned are in a fixed state, and the bottom end of the torsion rod 81 will be separated from the connection with the support screw 76 through the electromagnetic suction cup 742, so that the torsion rod 81 will not rotate continuously, thereby facilitating the misalignment adjustment of the upper and lower layers of the multiple spray pipes 52, thereby further increasing the water mist area sprayed by the multiple nozzles 53 in the spray tower 1, so that the incoming exhaust gas can fully contact the sprayed water mist over a large area, thereby further improving the filtering and washing treatment of impurities in the exhaust gas.

[0036] In this embodiment, the torsion adjustment assembly 8 further includes a connecting rod 86 and a limiting swivel 87. The top end of the torsion rod 81 extends upward from the cavity ring 51, and the outer ring surface of the top end is connected to at least two connecting rods 86. At least two connecting rods 86 are connected to the inner ring surface of the limiting swivel 87. The outer ring surface of the limiting swivel 87 is flush with the outer ring surface of the support ring 83, and the outer ring surface of the limiting swivel 87 is also in close contact with the multiple segmented magnetic blocks 84.

[0037] Specifically, in order to facilitate the resetting of the multiple spray pipes 52 after twisting, when the multiple spray pipes 52 are axially rotated to a certain degree of agitation, the electromagnetic suction block 84 will adsorb and fix the support ring 83, and will simultaneously adsorb and fix the limit swivel 87, and then adsorb and fix the torsion rod 81 through the connecting rod 86. At this time, the electromagnetic suction cup 742 in the sleeve 85 is disconnected from the torsion rod 81, so that the torsion rod 81 and the spray pipe 52 can be adsorbed and fixed synchronously, and the torsion spring 82 is in a tightened state. When the multiple spray pipes 52 need to be reset, the electromagnetic suction block 84 of the segment and the lower segment is first controlled to be disconnected from the adsorption of the support ring 83. , while the upper electromagnetic suction block 84 continues to adsorb and fix the limit swivel 87, and at this time the elastic restoring force of the torsion spring 82 will drive the multiple spray pipes 52 to reversely twist, so that they return to the initial position and continue to spray water mist, so that it is convenient to adjust the twisting position of the multiple spray pipes 52 in the lower layer at any time according to needs, so that they can fully spray water mist; when the multiple spray pipes 52 need to continue to twist, the upper part of the electromagnetic suction block 84 is separated from the adsorption of the limit swivel 87, so that the rotating shaft rod 74 can drive the torsion rod 81 to rotate through the connected support screw 76, so that the multiple spray pipes 52 in the lower layer can be twisted and connected with the multiple spray pipes above 52 misalignment, in order to improve the stability of the stretched elastic pipe network 72 after stretching, the limit swivel 87 can be adsorbed and fixed by the electromagnetic suction block 84, and then the torsion rod 81 and the support screw 76 are connected, so that the support screw 76 is in a fixed state, thereby facilitating the limit support of the elastic pipe network 72 after stretching and disconnecting; at the same time, in order to facilitate the reset of the elastic pipe network 72 after stretching, when the torsion spring 82 is in a tightened state, the magnetic suction block 84 of the lower section will first adsorb and fix the support ring 83, and the adsorption block of the upper section will be separated from the adsorption of the limit swivel 87, so that the torsion rod 81 rotates in the opposite direction under the reset action of the torsion spring 82, At this time, the torsion rod 81 is connected to the supporting screw 76, and the magnetic ring absorbs and fixes the limit ring 78, so that the reverse rotation of the supporting screw 76 will drive the mesh cover 73 to move downward through the screw nut 77, so that the stretched elastic pipe net 72 can be quickly reset, so that the filled filler balls 10 can be tightly and evenly dispersed in the filling cavity 721. Therefore, the stretched elastic pipe net 72 can be slowly restored under its own elastic restoring force as needed, so that the cavity of the filling cavity 721 is reduced, and the torsion rod 81 can be reversely twisted to make the screw nut 77 slide downward along the supporting screw 76, driving the elastic pipe net 72 to quickly reset.

[0038] In this embodiment, a plurality of toggle rods 88 are connected to the outer circumferential array of the connecting sleeve 741, and the plurality of toggle rods 88 are located in the elastic pipe network 72;

[0039] Specifically, when the rotating shaft rod 74 continuously rotates to drive the multiple scraper blades 791 to rotate, the multiple toggle rods 88 on the connecting sleeve 741 will also rotate in the elastic pipe network 72, so that it can stir the filler balls 10 filled in the elastic pipe network 72, so that the filler balls 10 can stir and rotate in the filling cavity 721, so that the exhaust gas flowing upward can fully contact with the stirring and rotating filler balls 10, so that it can further increase the filtering and washing effect of the filler balls 10 filled in the filling cavity on impurities in the exhaust gas.

[0040] In this embodiment, a demister 9 is installed above the interior of the spray tower 1, and the demister 9 is located above the upper spray pipe 52; specifically, the demister 9 can remove moisture from the exhaust gas after filtering and washing, so that the filtered exhaust gas can be discharged after dehumidification.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A NMP waste gas return air treatment process, characterized in that: include: A spray tower (1) is used for spraying and absorbing impurities mixed in the introduced NMP waste gas, wherein the spray tower (1) is connected to an air inlet channel (2) at the bottom of one side and is connected to an air outlet channel (3) at the top, and a waste liquid collection bin (4) is formed at the bottom of the spray tower (1); The spray mechanism (5) is connected to a water tank (6) below one side of the spray tower (1) through a water supply pipe (58) and is used to evenly spray the liquid in the water tank (6) into the spray tower (1) to contact and absorb the NMP waste gas introduced; The filler adjustment mechanism (7) is located below the spray mechanism (5) and is used to adjust the looseness and uniformity of the filler balls (10) filled in the filler cavity.

2. A NMP waste gas return air treatment process according to claim 1, characterized in that: The filler adjustment mechanism (7) comprises a filter screen (71), an elastic pipe network (72), a mesh cover (73), a rotating shaft (74), blades (75), a support screw (76), a screw nut (77), a limit ring (78) and a magnetic ring (79); the filter screen (71) is fixedly installed inside the spray tower (1); the upper surface of the filter screen (71) is connected to the elastic pipe network (72); the outer pipe wall of the elastic pipe network (72) is in close contact with the inner wall of the spray tower (1); the upper end of the elastic pipe network (72) is connected to the mesh cover (73); the center of the filter screen (71) is rotatably mounted with a rotating shaft (74) through a bearing; and the bottom end of the rotating shaft (74) extending downward is fixed with a plurality of blades (75); the plurality of blades (75) Located above the air inlet passage (2), the upper end surface of the rotating shaft rod (74) is connected to a supporting screw (76), and the top end of the supporting screw (76) extends upwardly out of the center hole of the mesh cover (73), the supporting screw (76) is sleeved with a screw nut (77), and the outer ring surface of the screw nut (77) is insulated and sleeved with a limiting ring (78), the limiting ring (78) is located in an annular cavity opened on the inner wall of the center hole of the mesh cover (73), a magnetic ring (79) is insulated and fixed on the inner wall of the annular cavity, and the magnetic ring (79) is sleeved on the outer ring surface of the limiting ring (78), a filling cavity (721) is formed between the filter screen (71), the elastic pipe network (72) and the mesh cover (73), and the filling cavity (721) is filled with filler balls (10).

3. A NMP waste gas return air treatment process according to claim 2, characterized in that: The outer ring surface of the rotating shaft rod (74) is equipped with a plurality of scraper blades (791) in a circular array, and the plurality of scraper blades (791) are in close contact with the lower surface of the filter screen (71); the top end of the rotating shaft rod (74) is connected to a sleeve (741), and a support screw (76) is inserted into the connecting sleeve (741); the bottom of the connecting sleeve (741) is insulated with an electromagnetic suction cup (742), and the electromagnetic suction cup (742) is insulated from the metal block installed at the bottom end of the support screw (76).

4. A NMP waste gas return air treatment process according to claim 3, characterized in that: The double-layer spray mechanism (5) is laid in the spray tower (1), comprising a cavity ring (51), a spray pipe (52), a nozzle (53), a diverter pipe (54), a connecting pipe (55), a connecting hose (56) and a support column (57). The upper and lower cavity rings (51) are arranged at the center of the spray tower (1), and the outer ring surface of the cavity ring (51) is connected to a plurality of spray pipes (52) in a circular array, and each spray pipe (52) is connected to a plurality of nozzles (53). The wall of the water supply pipe (58) is connected to at least two diverters (54). The invention relates to a spray tower (1) having two branch pipes (54), and two branch pipes (54) are fixed to the tower body of the spray tower (1); the branch pipe (54) located above is connected to one of the spray pipes (52) above through a connecting pipe (55); the branch pipe (54) located below is connected to one of the spray pipes (52) below through a connecting hose (56); the plurality of spray pipes (52) located above are fixedly supported to the tower body of the spray tower (1) through a plurality of supporting columns (57); and a torsion adjustment component (8) is provided at the cavity ring (51) located below.

5. A NMP waste gas return air treatment process according to claim 4, characterized in that: The torsion adjustment assembly (8) comprises a torsion rod (81), a torsion spring (82), a support ring (83), a magnetic block (84) and a sleeve (85); the torsion rod (81) is inserted into the cavity ring (51) located below, and the torsion rod (81) and the cavity ring (51) are connected via the torsion spring (82); the support ring (83) made of metal is insulatedly sleeved on the ends of the plurality of spray pipes (52) located at the lower layer; the spray tower (1 ) is insulated and installed with a plurality of magnetic blocks (84) on its inner wall, and the plurality of magnetic blocks (84) are in close contact with the outer ring surface of the support ring (83); the sleeve (85) is fixed to the top end of the support screw (76), and a torsion rod (81) is inserted into the sleeve (85); an electromagnetic suction cup (742) is also insulated and installed at the bottom of the sleeve (85), and the electromagnetic suction cup (742) is insulated and installed with a metal block in contact with the bottom end of the torsion rod (81).

6. A NMP waste gas return air treatment process according to claim 3, characterized in that: The torsion adjustment assembly (8) also includes a connecting rod (86) and a limiting swivel (87), the top end of the torsion rod (81) extends upward from the cavity ring (51), and the outer ring surface of the top end is connected to at least two connecting rods (86), at least two of the connecting rods (86) are connected to the inner ring surface of the limiting swivel (87), the outer ring surface of the limiting swivel (87) is flush with the outer ring surface of the support ring (83), and the outer ring surface of the limiting swivel (87) is also in close contact with a plurality of segmented magnetic blocks (84).

7. A NMP waste gas return air treatment process according to claim 3, characterized in that: The outer circumferential array of the connecting sleeve (741) is connected to a plurality of toggle rods (88), and the plurality of toggle rods (88) are located in the elastic pipe network (72).

8. A NMP waste gas return air treatment process according to claim 4, characterized in that: A demister (9) is installed above the interior of the spray tower (1), and the demister (9) is located above the upper spray pipe (52).

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