CN215275839U - Low NMP recovery plant that pollutes - Google Patents
Low NMP recovery plant that pollutes Download PDFInfo
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- CN215275839U CN215275839U CN202022677000.9U CN202022677000U CN215275839U CN 215275839 U CN215275839 U CN 215275839U CN 202022677000 U CN202022677000 U CN 202022677000U CN 215275839 U CN215275839 U CN 215275839U
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Abstract
The utility model discloses a low-pollution NMP recovery device, which is formed by combining an NMP reaction device, an air circulation device and a gas treatment device; the NMP reaction device is communicated with the air circulation device through an exhaust pipe; the air circulation device is communicated with the gas treatment device; the air circulation device includes: a first flow divider having an inlet in communication with the exhaust gas pipe; the vent pipe is communicated with an outlet of the first flow divider; the inlet and the outlet are respectively connected with the other outlet of the first flow divider and a circulating pipeline communicated with the inlet; the second flow divider is arranged on the circulating pipeline, and an outlet of the second flow divider is communicated with the vent pipe; an NMP concentration detector is arranged between the first splitter and the second splitter; the gas processing device comprises: the zeolite rotating wheel consists of treating area, cooling area and regenerating area, and is combined with the third flow divider and the return pipe with end connected to the first flow divider. The utility model discloses can reduce equipment jam and clean frequency and air pollution and improve resource utilization.
Description
Technical Field
The utility model relates to a chemical recovery plant technical field, in particular to NMP recovery plant who pollutes lowly.
Background
N-methyl pyrrolidone, the name of English is N-methyl-2-pyrollidone, NMP for short. The range of applications of NMP is mainly as follows: (1) NMP is used as a solvent for polyvinylidene fluoride, etc., and an electrode auxiliary material for lithium ion batteries; (2) can be used for removing liquid of photoresist and producing LCD liquid crystal material; (3) the method is applied to the production of solvents and (4) the cleaning of precision instruments and circuit boards in the semiconductor industry. The NMP recycling machine is a special device for recycling NMP, and is divided into a freezing recycling type and a rotating wheel recycling type, and used and dirty waste methyl pyrrolidone can be recycled through a solvent recycling machine and a vacuum pressure reduction system. Because of its higher boiling point, so can not adopt the direct recovery method, through vacuum decompression, can reduce and retrieve the heating temperature, guarantee to retrieve the quality, it has above nature to improve and retrieve the factor of safety, this substance can be mutually soluble with water, and the heat release is only the dissolution heat that he dissolved in water and releases, is similar to concentrated sulfuric acid and also can release a large amount of heat in adding water.
As the demand of lithium batteries is getting larger, the demand of NMP is also increasing accordingly. Because the price of NMP is not low, the actual price can exceed 14000 yuan per ton. Therefore, NMP can be recovered to reduce the production cost. In the prior art, the method for recovering NMP in the mixed solution is to dehydrate in vacuum, separate the crystallized salt in the attached sheet by a centrifuge, then put the clear solution into an NMP rectifying tower, rectify and recover NMP in a vacuum rectifying mode, and dilute and discharge the residual solution.
However, in the process of implementing the technical solution in the prior art, the applicant finds that the following technical problems exist in the technical solution in the prior art:
when the mixed solution is subjected to intermittent vacuum rectification dehydration, because salt (mainly sodium chloride NaCl) is not dissolved in NMP, a large amount of salt begins to crystallize and separate out along with the reduction of water in a tower kettle of a dehydration and rectification tower in the dehydration process, and the crystallized salt can only be accumulated in a gap between the lower part of the tower kettle and a heating pipeline when being generated, so that the heating efficiency is influenced, and the crystallized salt is difficult to discharge completely during discharging. In general, the ratio of crystallized salt to liquid material is about 42%, and the rest salt is remained in the tower kettle, which results in the blockage of the tower kettle. The tower kettle is cleaned every 6-7 days, and the shutdown cleaning reduces the utilization rate of equipment to cause the reduction of production efficiency. In addition, there are problems in that NMP contained in the discharged exhaust gas affects air quality and wastes resources. Although the adsorption of NMP can reduce air pollution, the exhaust gas is in a non-full load state when the adsorption equipment is started under the condition that the concentration of NMP is insufficient, which also belongs to a resource waste. Meanwhile, whether the adsorption equipment can completely adsorb the NMP is very difficult to ensure, and the NMP-containing waste gas passing through the adsorption equipment is discharged into the atmosphere if not completely adsorbed, which is also a waste of resources and can also cause negative effects on the quality of the atmosphere.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a low NMP recovery plant that pollutes has solved among the prior art that equipment easily blocks up and needs frequent clean technical problem and the air quality that leads to production efficiency to receive the influence receive influence and wasting of resources's technical problem, has reached the technical effect that reduces equipment jam risk and improve production efficiency and air quality and make full use of resource.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a low-pollution NMP recovery device is formed by combining an NMP reaction device, an air circulation device and a gas treatment device; the NMP reaction device is communicated with the air circulation device through an exhaust pipe; the air circulation device is communicated with the gas treatment device;
the NMP reaction apparatus comprises:
the reaction kettle tower consists of a cylindrical upper kettle cavity positioned at the top of the reaction kettle tower, a middle kettle cavity positioned in the middle part of the reaction kettle tower and a lower kettle cavity positioned below the reaction kettle tower; the middle kettle cavity is provided with a first operation window; a second operation window is arranged at the bottom of the lower kettle cavity;
the partition wall is positioned between the middle kettle cavity and the lower kettle cavity and partitions the middle kettle cavity and the lower kettle cavity; a ceramic heating pipe set is embedded in the partition wall;
the guide cylinder is arranged in the center of the partition wall and is in a cylindrical or inverted cone shape;
the first heating element is arranged at the bottom close to the lower kettle cavity;
the second heating element is arranged in the middle kettle cavity and is in a round bar shape, one end of the second heating element is fixed on the kettle wall of the reaction kettle tower, and the other end of the second heating element is parallel to the ground and extends to the middle kettle cavity;
the rotating mechanism is arranged on the bottom wall close to the lower kettle cavity and is used for nesting the second heating element inside;
a steam pipe connecting inlets of the first and second heating members;
the discharge pipeline extends from the lower kettle cavity from bottom to top and leaves the reaction kettle tower from the side wall of the lower kettle cavity, and the inlet of the discharge pipeline is higher than the bottom of the lower kettle cavity by more than 45 cm;
the air circulation device includes:
a first flow divider, an inlet of said first flow divider communicating with said exhaust gas duct;
the vent pipe is communicated with an outlet of the first flow divider;
the inlet and the outlet of the circulating pipeline are respectively connected with the other outlet and the inlet of the first flow divider and communicated with each other;
the second flow divider is arranged on the circulating pipeline, and the outlet of the second flow divider is communicated with the vent pipe; an NMP concentration detector is arranged between the first shunt and the second shunt and is electrically connected with the second shunt;
the gas processing apparatus includes:
the zeolite rotating wheel consists of a treatment area, a cooling area and a regeneration area; the treatment area is positioned below the zeolite rotating wheel, and the inlet of the treatment area is communicated with the vent pipe; the regeneration zone is positioned above the zeolite rotating wheel; the cooling zone is located above the treatment zone and below the regeneration zone; the regeneration zone is connected with the coating equipment group through an air return pipe;
the exhaust pipe is connected with the treatment area, NMP is adsorbed in the treatment area when the NMP-containing gas in the exhaust pipe passes through the treatment area, and the gas is exhausted through the exhaust pipe;
the inlet of the third flow divider is connected with the exhaust pipe;
an atmosphere discharge pipe connected with one outlet of the third flow divider;
and the return pipe is connected with the other outlet of the third shunt, and the tail end of the return pipe is connected with the first shunt.
Preferably, the rotating mechanism consists of a vertical fixing piece, a rotating shaft, a surrounding piece and a circular cover body; the pair of vertical fixing pieces are respectively fixed at two ends of the rotating mechanism; the rotating shaft is arranged on the central axis of the rotating mechanism and fixed on the fixing piece; the surrounding piece is sheet-shaped and is connected with the circle cover bodies fixed at the two ends of the rotating mechanism; the ceramic heating tube group has at least one layer; the first operation window is positioned on the side wall of the middle kettle cavity; the device also comprises a cooler and a heater, wherein the cooler and the heater are respectively communicated with the cooling area and the regeneration area; the exhaust pipe is provided with an NMP concentration detector electrically connected with the third shunt.
Preferably, the guide cylinder is in an inverted cone shape; the ceramic heating tube group has one layer; the inlet of the discharge pipeline is 50cm higher than the bottom of the lower kettle cavity; and a gas outlet of the cooling zone is communicated with the heater so as to reheat the cooled gas and use the reheated gas in the regeneration zone to desorb and recover adsorbed NMP.
Preferably, the device further comprises a driving motor arranged on the reaction kettle tower, and the driving motor is connected with the rotating shaft so as to drive the rotating mechanism to rotate; and an NMP concentration detector is arranged in the first shunt.
Preferably, the ceramic heating tube set is in the shape of a semicircle, and the radius of the ceramic heating tube set is more than 5/7 of the thickness of the partition wall; air blowing pipes are further arranged on two sides of the lower kettle cavity and are inverted L-shaped, and outlets of the air blowing pipes are opened towards the side wall of the lower kettle cavity and are separated from the side wall of the lower kettle cavity by more than 55 cm; the semi-circular curved surface of the ceramic heating pipe group faces the middle kettle cavity.
Preferably, the upper surface of the partition wall is an undulating surface; the semi-circular curved surface of the ceramic heating tube set faces the bottom of the wavy surface; the device also comprises a baffle close to the outlet of the air blowing pipe, one end of the baffle is fixed on the side wall of the lower kettle cavity, and the other end of the baffle extends towards the direction of the partition wall; the baffle is 30 degrees to the ground.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
according to the technical scheme, the device is formed by combining an NMP reaction device, an air circulation device and a gas treatment device; the NMP reaction device is communicated with the air circulation device through an exhaust pipe; the air circulation device is communicated with the gas treatment device; wherein, the zeolite rotating wheel consists of a treatment area, a cooling area and a regeneration area; the treatment area is positioned below the zeolite rotating wheel; the regeneration zone is positioned above the zeolite rotating wheel; the cooling zone is located above the treatment zone and below the regeneration zone; the regeneration area is connected with the coating equipment group through a return air pipe; the NMP reaction device comprises a rotary mechanism, a guide cylinder, a first heating assembly, a second heating assembly, a ceramic heating assembly, a discharge pipeline, a reaction kettle tower and a reaction kettle tower, wherein the rotary mechanism is arranged in a lower kettle cavity of the NMP reaction device, the guide cylinder is combined with a partition wall for separating the middle kettle cavity and the lower kettle cavity, the guide cylinder allows fluid to flow from the lower kettle cavity to the middle kettle cavity, the first heating assembly and the second heating assembly which are respectively positioned in the lower kettle cavity and the middle kettle cavity are combined with the partition wall, the ceramic heating assembly is embedded in the partition wall, the middle kettle cavity is provided with a first operation window, the bottom of the lower kettle cavity is provided with a second operation window, and an inlet which extends from the bottom to the top of the lower kettle cavity and leaves the reaction kettle tower from the side wall of the lower kettle cavity is higher than the bottom of the lower kettle cavity by more than 45 cm; and a return pipe connected to the other outlet of the third flow divider and connected to the first flow divider at its end in the gas processing apparatus. The second heating assembly in the middle kettle cavity space heats and evaporates the water in the salt-containing NMP water solution to form crystallized salt, and the crystallized salt stays on the partition wall to form a middle crystallization space to avoid accumulating at the bottom of the reaction kettle tower; in addition, under the stirring of the rotating mechanism, the crystallized salt is suspended in the kettle liquid and is not deposited at the bottom of the lower kettle cavity; meanwhile, the first heating assembly is nested in the rotating mechanism, kettle liquid is heated while being stirred, a kettle for mixing salt crystals rotates and rises and enters the middle kettle cavity through the guide cylinder, in the process of kettle liquid rising, crystals originally located in the lower kettle cavity flow into the middle kettle cavity together with the kettle liquid, the middle kettle cavity is heated by the second heating assembly, and particularly under the condition that the ceramic heating tube group is embedded in the partition wall to reduce the heating distance and improve the heat transmission efficiency, the kettle liquid is evaporated and the saturation of the crystals is improved, so that the growth of salt crystal particles is facilitated. The liquid in the upper kettle cavity can flow into the middle kettle cavity along the wall of the kettle cavity or flow into the lower kettle cavity through the guide cylinder to fill the volume left by the liquid in the upper flow cavity rising. After the distillation is finished, the rotating mechanism continues to rotate, most salt crystals are suspended in the kettle liquid and are discharged out of the reaction kettle tower, and the requirement for shutdown cleaning is reduced. In addition, under the arrangement of the first operation window and the second operation window, the crystallized salt is convenient to drain, and the cleaning time is reduced. The discharge pipe that from bottom to top drains away the cauldron liquid is higher than the diapire, reduces the crystallization salt jam risk of deposiing in the bottom. Furthermore, when air circulating device made the concentration of NMP not reach certain severity yet in the waste gas that NMP reaction unit discharged, in order to avoid gas treatment device low-load operation to cause the wasting of resources, earlier waste gas at the circulating line inner loop, along with the waste gas increase of replenishment, the NMP concentration of gathering improves, after NMP's concentration had arrived certain severity, arranges to gas treatment device through the second shunt and handles. In addition, the zeolite wheel comprising the treating zone, the cooling zone and the regenerating zone can adsorb and recover NMP in the waste gas, and prevent NMP in the gas discharged to the air. Meanwhile, in order to avoid the situation that NMP is discharged into the air due to the fact that the zeolite rotating wheel cannot adsorb the NMP in percentage as much as possible, the gas entering the exhaust pipe after passing through the zeolite rotating wheel passes through the third flow divider, at least a part or all of the gas is divided by the third flow divider and enters the air circulating device again for NMP content detection and flow dividing, and pollution and waste caused by the fact that the NMP-containing gas is discharged into the atmosphere by mistake are effectively reduced. The technical problems that equipment in the prior art is easy to block and frequent cleaning is needed to cause production efficiency to be affected and air quality to be affected and resources are wasted are effectively solved, and the technical effects that equipment blocking risks are reduced, production efficiency and air quality are improved and resources are fully utilized are achieved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a rotating mechanism in the present invention;
fig. 3 is a schematic structural view of an embodiment in which the partition wall of the present invention has a wavy surface.
In the figure, 10-flow direction, 20-NMP reaction unit, 21-waste gas pipe, 30-gas treatment unit, 31-vent pipe, 32-return pipe, 33-coating equipment group, 34-atmospheric discharge pipe, 35-return pipe, 40-zeolite wheel, 41-treatment zone, 43-cooling zone, 45-regeneration zone, 47-cooler, 49-heater, 50-air circulation unit, 51-first diverter, 52-vent pipe, 53-second diverter, 54-circulation pipe, 55-NMP concentration detector, 56-third diverter, 100-reaction kettle tower, 101-first operation window, 103-second operation window, 110-lower kettle cavity, 120-middle kettle cavity, 130-upper kettle cavity, 140-partition wall, 141-wavy surface, 200-steam pipeline, 210-ceramic heating tube group, 310-first heating component, 320-second heating component, 400-rotating mechanism, 410-vertical fixing piece, 420-rotating shaft, 430-surrounding piece, 500-guide cylinder, 600-driving motor, 700-air blowing pipe, 710-baffle plate and 800-discharge pipeline.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The technical scheme of the embodiment of the application solves the problems that the equipment is easy to block and the production efficiency is affected and resources are wasted due to frequent cleaning by providing the low-pollution NMP recovery equipment, and is formed by combining an NMP reaction device 20, an air circulation device 50 and a gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is in communication with the gas treatment device 30; wherein, the zeolite rotating wheel 40 consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is located below the zeolite wheel 40; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35; wherein, the apparatus further comprises a rotary mechanism 400 arranged in the lower kettle cavity 110 of the NMP reaction device 20, a partition wall 140 for separating the middle kettle cavity 120 and the lower kettle cavity 110, a guide cylinder 500 for allowing fluid to flow from the lower kettle cavity 110 to the middle kettle cavity 120, a first heating component 310 and a second heating component 320 which are respectively arranged in the lower kettle cavity 110 and the middle kettle cavity 120, and a ceramic heating tube group 210 embedded in the partition wall, wherein the middle kettle cavity 120 is provided with a first operation window 101, the bottom of the lower kettle cavity 110 is provided with a second operation window 103, and a discharge pipeline 800 which extends from the bottom to the top of the lower kettle cavity 110 and is higher than the bottom of the lower kettle cavity 110 by more than 45cm is arranged at the inlet of the reaction kettle tower 100 separated from the side wall of the lower kettle cavity 110; and the return pipe 32 connected with the other outlet of the third flow divider 56 and connected with the first flow divider 51 at the end of the gas processing device 30, the system has the advantages of reducing the risk of equipment blockage, improving the production efficiency and the air quality and fully utilizing resources.
The general idea of the embodiment of the invention for solving the technical problems is as follows:
the device is formed by combining an NMP reaction device 20, an air circulation device 50 and a gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is in communication with the gas treatment device 30; wherein, the zeolite rotating wheel 40 consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is located below the zeolite wheel 40; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35; wherein, the apparatus further comprises a rotary mechanism 400 arranged in the lower kettle cavity 110 of the NMP reaction device 20, a partition wall 140 for separating the middle kettle cavity 120 and the lower kettle cavity 110, a guide cylinder 500 for allowing fluid to flow from the lower kettle cavity 110 to the middle kettle cavity 120, a first heating component 310 and a second heating component 320 which are respectively arranged in the lower kettle cavity 110 and the middle kettle cavity 120, and a ceramic heating tube group 210 embedded in the partition wall, wherein the middle kettle cavity 120 is provided with a first operation window 101, the bottom of the lower kettle cavity 110 is provided with a second operation window 103, and a discharge pipeline 800 which extends from the bottom to the top of the lower kettle cavity 110 and is higher than the bottom of the lower kettle cavity 110 by more than 45cm is arranged at the inlet of the reaction kettle tower 100 separated from the side wall of the lower kettle cavity 110; and a return pipe 32 connected to the other outlet of the third flow divider 56 and connected to the first flow divider 51 at the end of the return pipe in the gas processing apparatus 30. So that the second heating assembly 320 in the space of the middle kettle cavity 120 heats and evaporates the water in the salt-containing NMP water solution to form crystallized salt and stays above the partition wall 140 to form a middle crystallized space to avoid accumulating at the bottom of the reaction kettle tower 100; in addition, under the agitation of the rotating mechanism 400, the crystallized salt is suspended in the kettle solution without being deposited on the bottom of the lower kettle chamber 110; meanwhile, the first heating assembly 310 is nested in the rotating mechanism, the kettle liquid is heated while being stirred, the kettle for mixing salt crystals rotates, rises and enters the middle kettle cavity 120 through the guide cylinder 500, in the process of kettle liquid rising, crystals originally located in the lower kettle cavity 110 flow into the middle kettle cavity 120 along with the kettle liquid, the middle kettle cavity 120 is heated by the second heating assembly 320, and particularly under the condition that the ceramic heating tube group 210 is embedded in the partition wall 140 to reduce the heating distance and improve the heat transmission efficiency, the kettle liquid is evaporated and the saturation of the crystals is improved, so that the growth of salt crystal particles is facilitated. The liquid in the upper kettle cavity 130 can flow into the middle kettle cavity 120 along the kettle cavity wall or flow into the lower kettle cavity 110 through the guide cylinder 500 to fill the volume left by the liquid in the upper kettle cavity rising. After the distillation is finished, the rotating mechanism 400 continues to rotate, most salt crystals are suspended in the kettle liquid and are discharged out of the reaction kettle tower 100, and the requirement of shutdown cleaning is reduced. In addition, under the arrangement of the first operation window 101 and the second operation window 103, the crystallized salt is convenient to drain away, and the cleaning time is reduced. Discharge pipe 800 of drain off cauldron liquid from bottom to top is higher than the diapire, reduces the crystallization salt jam risk of deposiing in the bottom. Furthermore, when the concentration of NMP in the exhaust gas discharged from the NMP reaction device 20 has not reached a certain severity by the air circulation device 50, in order to avoid resource waste caused by low-load operation of the gas treatment device 30, the exhaust gas is circulated in the circulation pipeline 54, the concentration of the collected NMP increases as the amount of the supplemented exhaust gas increases, and when the concentration of NMP reaches a certain severity, the NMP is discharged to the gas treatment device 30 through the second flow divider 53 for treatment. In addition, the zeolite wheel 40 composed of the treating zone 41, the cooling zone 43 and the regeneration zone 45 can adsorb and recover NMP in the exhaust gas, and prevent NMP from being contained in the gas discharged to the air. Meanwhile, in order to avoid the situation that NMP is discharged into the air due to the fact that the zeolite rotating wheel 40 cannot adsorb NMP in percentage as much as possible, the gas entering the exhaust pipe 31 after passing through the zeolite rotating wheel 40 passes through the third flow divider 56, and at least a part or all of the gas divided by the third flow divider 56 enters the air circulating device 50 again for NMP content detection and flow division, so that pollution and waste caused by the fact that NMP-containing gas is discharged into the atmosphere by mistake are effectively reduced.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First embodiment
A low pollution NMP recovery equipment, as shown in figure 1, is composed of NMP reaction device 20, air circulation device 50 and gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30;
the NMP reaction apparatus 20 includes:
a reaction kettle tower 100 consisting of a cylindrical upper kettle cavity 130 positioned at the top of the reaction kettle tower 100, a middle kettle cavity 120 positioned at the middle part of the reaction kettle tower 100 and a lower kettle cavity 110 positioned below the reaction kettle tower 100; the middle kettle cavity 120 is provided with a first operation window 101; the bottom of the lower kettle cavity 110 is provided with a second operation window 103;
a partition wall 140 positioned between the middle kettle cavity 120 and the lower kettle cavity 110 and separating the middle kettle cavity 120 from the lower kettle cavity 110; a ceramic heating tube set 210 is embedded in the partition wall 140;
a guide cylinder 500 disposed at the center of the partition wall 140 and having a cylindrical or reverse tapered shape;
a first heating element disposed proximate the bottom of the lower kettle chamber 110;
the second heating element is arranged in the middle kettle cavity 120, is in a round bar shape, and has one end fixed on the kettle wall of the reaction kettle tower 100 and the other end parallel to the ground and extends towards the middle kettle cavity 120;
the rotating mechanism 400 is arranged on the bottom wall close to the lower kettle cavity 110 and nests the second heating element inside;
a steam pipe 200 connecting inlets of the first heating member and the second heating member;
a discharge pipe 800 extending from the lower kettle cavity 110 from bottom to top and leaving the reaction kettle tower 100 from the side wall of the lower kettle cavity 110, the inlet of the discharge pipe 800 being higher than the bottom of the lower kettle cavity 110 by more than 45 cm;
the air circulation device 50 includes:
a first flow divider 51, an inlet of the first flow divider 51 communicating with the exhaust gas pipe 21;
a vent pipe 52 communicating with an outlet of the first flow divider 51;
a circulation pipe 54 having an inlet and an outlet connected to and communicated with the other outlet and the inlet of the first flow divider 51, respectively;
a second flow divider 53 provided in the circulation pipe 54, an outlet of which communicates with the air pipe 52; an NMP concentration detector 55 is arranged between the first shunt 51 and the second shunt 53, and the NMP concentration detector is electrically connected with the second shunt 53;
the gas processing apparatus 30 includes:
a zeolite rotating wheel 40 which consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is positioned below the zeolite wheel 40, and the inlet of the treatment zone is communicated with a vent pipe 52; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35;
an exhaust pipe 31 connected to the treatment region 41, wherein NMP is adsorbed in the treatment region 41 when NMP-containing gas in the exhaust pipe 21 passes through the treatment region 41, and the gas is exhausted through the exhaust pipe 31;
a third diverter 56 having an inlet connected to the exhaust pipe 31;
an atmospheric air discharge pipe 34 connected to one of the outlets of the third flow divider 56;
a return pipe 32, which is connected to the other outlet of the third diverter 56, and which is connected at its end to the first diverter 51.
One or more technical solutions provided by the present embodiment have at least the following technical effects or advantages:
the technical proposal is that the device is formed by combining an NMP reaction device 20, an air circulation device 50 and a gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30; wherein, the zeolite rotating wheel 40 consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is located below the zeolite wheel 40; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35; wherein, the apparatus further comprises a rotary mechanism 400 arranged in the lower kettle cavity 110 of the NMP reaction device 20, a partition wall 140 for separating the middle kettle cavity 120 and the lower kettle cavity 110, a guide cylinder 500 for allowing fluid to flow from the lower kettle cavity 110 to the middle kettle cavity 120, a first heating component 310 and a second heating component 320 which are respectively arranged in the lower kettle cavity 110 and the middle kettle cavity 120, and a ceramic heating tube group 210 embedded in the partition wall, wherein the middle kettle cavity 120 is provided with a first operation window 101, the bottom of the lower kettle cavity 110 is provided with a second operation window 103, and a discharge pipeline 800 which extends from the bottom to the top of the lower kettle cavity 110 and is higher than the bottom of the lower kettle cavity 110 by more than 45cm is arranged at the inlet of the reaction kettle tower 100 separated from the side wall of the lower kettle cavity 110; and a return pipe 32 connected to the other outlet of the third flow divider 56 and connected to the first flow divider 51 at the end of the gas processing apparatus 30. So that the second heating assembly 320 in the space of the middle kettle cavity 120 heats and evaporates the water in the salt-containing NMP water solution to form crystallized salt and stays above the partition wall 140 to form a middle crystallized space to avoid accumulating at the bottom of the reaction kettle tower 100; in addition, under the agitation of the rotating mechanism 400, the crystallized salt is suspended in the kettle solution without being deposited on the bottom of the lower kettle chamber 110; meanwhile, the first heating assembly 310 is nested in the rotating mechanism, the kettle liquid is heated while being stirred, the kettle for mixing salt crystals rotates, rises and enters the middle kettle cavity 120 through the guide cylinder 500, in the process of kettle liquid rising, crystals originally located in the lower kettle cavity 110 flow into the middle kettle cavity 120 along with the kettle liquid, the middle kettle cavity 120 is heated by the second heating assembly 320, and particularly under the condition that the ceramic heating tube group 210 is embedded in the partition wall 140 to reduce the heating distance and improve the heat transmission efficiency, the kettle liquid is evaporated and the saturation of the crystals is improved, so that the growth of salt crystal particles is facilitated. The liquid in the upper kettle cavity 130 can flow into the middle kettle cavity 120 along the kettle cavity wall or flow into the lower kettle cavity 110 through the guide cylinder 500 to fill the volume left by the liquid in the upper kettle cavity rising. After the distillation is finished, the rotating mechanism 400 continues to rotate, most salt crystals are suspended in the kettle liquid and are discharged out of the reaction kettle tower 100, and the requirement of shutdown cleaning is reduced. In addition, under the arrangement of the first operation window 101 and the second operation window 103, the crystallized salt is convenient to drain away, and the cleaning time is reduced. Discharge pipe 800 of drain off cauldron liquid from bottom to top is higher than the diapire, reduces the crystallization salt jam risk of deposiing in the bottom. Furthermore, when the concentration of NMP in the exhaust gas discharged from the NMP reaction device 20 has not reached a certain severity by the air circulation device 50, in order to avoid resource waste caused by low-load operation of the gas treatment device 30, the exhaust gas is circulated in the circulation pipeline 54, the concentration of the collected NMP increases as the amount of the supplemented exhaust gas increases, and when the concentration of NMP reaches a certain severity, the NMP is discharged to the gas treatment device 30 through the second flow divider 53 for treatment. In addition, the zeolite wheel 40 composed of the treating zone 41, the cooling zone 43 and the regeneration zone 45 can adsorb and recover NMP in the exhaust gas, and prevent NMP from being contained in the gas discharged to the air. Meanwhile, in order to avoid the situation that NMP is discharged into the air due to the fact that the zeolite rotating wheel 40 cannot adsorb NMP in percentage as much as possible, the gas entering the exhaust pipe 31 after passing through the zeolite rotating wheel 40 passes through the third flow divider 56, and at least a part or all of the gas divided by the third flow divider 56 enters the air circulating device 50 again for NMP content detection and flow division, so that pollution and waste caused by the fact that NMP-containing gas is discharged into the atmosphere by mistake are effectively reduced. The technical problems that equipment in the prior art is easy to block and frequent cleaning is needed to cause production efficiency to be affected and air quality to be affected and resources are wasted are effectively solved, and the technical effects that equipment blocking risks are reduced, production efficiency and air quality are improved and resources are fully utilized are achieved.
Second embodiment
A low pollution NMP recovery equipment, as shown in figure 1, is composed of NMP reaction device 20, air circulation device 50 and gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30;
the NMP reaction apparatus 20 includes:
a reaction kettle tower 100 consisting of a cylindrical upper kettle cavity 130 positioned at the top of the reaction kettle tower 100, a middle kettle cavity 120 positioned at the middle part of the reaction kettle tower 100 and a lower kettle cavity 110 positioned below the reaction kettle tower 100; the middle kettle cavity 120 is provided with a first operation window 101; the bottom of the lower kettle cavity 110 is provided with a second operation window 103;
a partition wall 140 positioned between the middle kettle cavity 120 and the lower kettle cavity 110 and separating the middle kettle cavity 120 from the lower kettle cavity 110; a ceramic heating tube set 210 is embedded in the partition wall 140;
a guide cylinder 500 disposed at the center of the partition wall 140 and having a cylindrical or reverse tapered shape;
a first heating element disposed proximate the bottom of the lower kettle chamber 110;
the second heating element is arranged in the middle kettle cavity 120, is in a round bar shape, and has one end fixed on the kettle wall of the reaction kettle tower 100 and the other end parallel to the ground and extends towards the middle kettle cavity 120;
the rotating mechanism 400 is arranged on the bottom wall close to the lower kettle cavity 110 and nests the second heating element inside;
a steam pipe 200 connecting inlets of the first heating member and the second heating member;
a discharge pipe 800 extending from the lower kettle cavity 110 from bottom to top and leaving the reaction kettle tower 100 from the side wall of the lower kettle cavity 110, the inlet of the discharge pipe 800 being higher than the bottom of the lower kettle cavity 110 by more than 45 cm;
the air circulation device 50 includes:
a first flow divider 51, an inlet of the first flow divider 51 communicating with the exhaust gas pipe 21;
a vent pipe 52 communicating with an outlet of the first flow divider 51;
a circulation pipe 54 having an inlet and an outlet connected to and communicated with the other outlet and the inlet of the first flow divider 51, respectively;
a second flow divider 53 provided in the circulation pipe 54, an outlet of which communicates with the air pipe 52; an NMP concentration detector 55 is arranged between the first shunt 51 and the second shunt 53, and the NMP concentration detector is electrically connected with the second shunt 53;
the gas processing apparatus 30 includes:
a zeolite rotating wheel 40 which consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is positioned below the zeolite wheel 40, and the inlet of the treatment zone is communicated with a vent pipe 52; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35;
an exhaust pipe 31 connected to the treatment region 41, wherein NMP is adsorbed in the treatment region 41 when NMP-containing gas in the exhaust pipe 21 passes through the treatment region 41, and the gas is exhausted through the exhaust pipe 31;
a third diverter 56 having an inlet connected to the exhaust pipe 31;
an atmospheric air discharge pipe 34 connected to one of the outlets of the third flow divider 56;
a return pipe 32, which is connected to the other outlet of the third diverter 56, and which is connected at its end to the first diverter 51.
Specifically, as shown in fig. 2, the rotating mechanism 400 is composed of a vertical fixing member 410, a rotating shaft 420, a surrounding member 430 and a circular cover; a pair of vertical fixing members 410 fixed to both ends of the rotating mechanism 400, respectively; the rotating shaft 420 is installed through the central axis of the rotating mechanism 400 and fixed on the fixing member; the surrounding piece 430 is in a sheet shape and is connected with and fixed on the circular cover bodies at two ends of the rotating mechanism 400; the ceramic heating tube set 210 has at least one layer; the first work window 101 is positioned on the side wall of the middle kettle cavity 120; a cooler 47 and a heater 49 are further included, the cooler 47 and the heater 49 are respectively communicated with the cooling zone 43 and the regeneration zone 45; the exhaust pipe 31 is provided with an NMP concentration detector 55 electrically connected to the third shunt 56.
Specifically, the guide cylinder 500 is shaped as an inverted cone; the ceramic heating tube set 210 has one layer; the inlet of the discharge pipe 800 is 50cm higher than the bottom of the lower kettle cavity 110; the gas outlet of the cooling zone 43 is in communication with a heater 49 to reheat the cooled gas and for the regeneration zone 45 to desorb and recover the adsorbed NMP.
Specifically, the device further comprises a driving motor 600 arranged on the reaction kettle tower 100, wherein the driving motor 600 is connected with the rotating shaft 420 through a shaft so as to drive the rotating mechanism 400 to rotate; the first flow divider 51 is provided therein with an NMP concentration detector 55.
Specifically, the ceramic heating tube set 210 is semicircular in shape, and the radius thereof is greater than 5/7 of the thickness of the partition wall 140; both sides of the lower kettle cavity 110 are also provided with air blowing pipes 700, the air blowing pipes 700 are inverted L-shaped, and the outlets of the air blowing pipes 700 are opened towards the side wall of the lower kettle cavity 110 and are more than 55cm away from the side wall of the lower kettle cavity 110; the semi-circular curved surface of the ceramic heating tube set 210 faces the mid-kettle cavity 120.
One or more technical solutions provided by the present embodiment have at least the following technical effects or advantages:
the technical proposal is that the device is formed by combining an NMP reaction device 20, an air circulation device 50 and a gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30; wherein, the zeolite rotating wheel 40 consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is located below the zeolite wheel 40; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35; wherein, the apparatus further comprises a rotary mechanism 400 arranged in the lower kettle cavity 110 of the NMP reaction device 20, a partition wall 140 for separating the middle kettle cavity 120 and the lower kettle cavity 110, a guide cylinder 500 for allowing fluid to flow from the lower kettle cavity 110 to the middle kettle cavity 120, a first heating component 310 and a second heating component 320 which are respectively arranged in the lower kettle cavity 110 and the middle kettle cavity 120, and a ceramic heating tube group 210 embedded in the partition wall, wherein the middle kettle cavity 120 is provided with a first operation window 101, the bottom of the lower kettle cavity 110 is provided with a second operation window 103, and a discharge pipeline 800 which extends from the bottom to the top of the lower kettle cavity 110 and is higher than the bottom of the lower kettle cavity 110 by more than 45cm is arranged at the inlet of the reaction kettle tower 100 separated from the side wall of the lower kettle cavity 110; and a return pipe 32 connected to the other outlet of the third flow divider 56 and connected to the first flow divider 51 at the end of the gas processing apparatus 30. So that the second heating assembly 320 in the space of the middle kettle cavity 120 heats and evaporates the water in the salt-containing NMP water solution to form crystallized salt and stays above the partition wall 140 to form a middle crystallized space to avoid accumulating at the bottom of the reaction kettle tower 100; in addition, under the agitation of the rotating mechanism 400, the crystallized salt is suspended in the kettle solution without being deposited on the bottom of the lower kettle chamber 110; meanwhile, the first heating assembly 310 is nested in the rotating mechanism, the kettle liquid is heated while being stirred, the kettle for mixing salt crystals rotates, rises and enters the middle kettle cavity 120 through the guide cylinder 500, in the process of kettle liquid rising, crystals originally located in the lower kettle cavity 110 flow into the middle kettle cavity 120 along with the kettle liquid, the middle kettle cavity 120 is heated by the second heating assembly 320, and particularly under the condition that the ceramic heating tube group 210 is embedded in the partition wall 140 to reduce the heating distance and improve the heat transmission efficiency, the kettle liquid is evaporated and the saturation of the crystals is improved, so that the growth of salt crystal particles is facilitated. The liquid in the upper kettle cavity 130 can flow into the middle kettle cavity 120 along the kettle cavity wall or flow into the lower kettle cavity 110 through the guide cylinder 500 to fill the volume left by the liquid in the upper kettle cavity rising. After the distillation is finished, the rotating mechanism 400 continues to rotate, most salt crystals are suspended in the kettle liquid and are discharged out of the reaction kettle tower 100, and the requirement of shutdown cleaning is reduced. In addition, under the arrangement of the first operation window 101 and the second operation window 103, the crystallized salt is convenient to drain away, and the cleaning time is reduced. Discharge pipe 800 of drain off cauldron liquid from bottom to top is higher than the diapire, reduces the crystallization salt jam risk of deposiing in the bottom. Furthermore, when the concentration of NMP in the exhaust gas discharged from the NMP reaction device 20 has not reached a certain severity by the air circulation device 50, in order to avoid resource waste caused by low-load operation of the gas treatment device 30, the exhaust gas is circulated in the circulation pipeline 54, the concentration of the collected NMP increases as the amount of the supplemented exhaust gas increases, and when the concentration of NMP reaches a certain severity, the NMP is discharged to the gas treatment device 30 through the second flow divider 53 for treatment. In addition, the zeolite wheel 40 composed of the treating zone 41, the cooling zone 43 and the regeneration zone 45 can adsorb and recover NMP in the exhaust gas, and prevent NMP from being contained in the gas discharged to the air. Meanwhile, in order to avoid the situation that NMP is discharged into the air due to the fact that the zeolite rotating wheel 40 cannot adsorb NMP in percentage as much as possible, the gas entering the exhaust pipe 31 after passing through the zeolite rotating wheel 40 passes through the third flow divider 56, and at least a part or all of the gas divided by the third flow divider 56 enters the air circulating device 50 again for NMP content detection and flow division, so that pollution and waste caused by the fact that NMP-containing gas is discharged into the atmosphere by mistake are effectively reduced. The technical problems that equipment in the prior art is easy to block and frequent cleaning is needed to cause production efficiency to be affected and air quality to be affected and resources are wasted are effectively solved, and the technical effects that equipment blocking risks are reduced, production efficiency and air quality are improved and resources are fully utilized are achieved.
In addition, the exhaust pipe 31 is provided with an NMP concentration detector 55 electrically connected with the third shunt 56, so that the cyclic detection and classification can be effectively controlled again, and the proportion of gas discharged to the atmosphere can be effectively distributed, thereby further protecting the air quality and fully utilizing resources.
Third embodiment
A low pollution NMP recovery equipment, as shown in figure 1, is composed of NMP reaction device 20, air circulation device 50 and gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30;
the NMP reaction apparatus 20 includes:
a reaction kettle tower 100 consisting of a cylindrical upper kettle cavity 130 positioned at the top of the reaction kettle tower 100, a middle kettle cavity 120 positioned at the middle part of the reaction kettle tower 100 and a lower kettle cavity 110 positioned below the reaction kettle tower 100; the middle kettle cavity 120 is provided with a first operation window 101; the bottom of the lower kettle cavity 110 is provided with a second operation window 103;
a partition wall 140 positioned between the middle kettle cavity 120 and the lower kettle cavity 110 and separating the middle kettle cavity 120 from the lower kettle cavity 110; a ceramic heating tube set 210 is embedded in the partition wall 140;
a guide cylinder 500 disposed at the center of the partition wall 140 and having a cylindrical or reverse tapered shape;
a first heating element disposed proximate the bottom of the lower kettle chamber 110;
the second heating element is arranged in the middle kettle cavity 120, is in a round bar shape, and has one end fixed on the kettle wall of the reaction kettle tower 100 and the other end parallel to the ground and extends towards the middle kettle cavity 120;
the rotating mechanism 400 is arranged on the bottom wall close to the lower kettle cavity 110 and nests the second heating element inside;
a steam pipe 200 connecting inlets of the first heating member and the second heating member;
a discharge pipe 800 extending from the lower kettle cavity 110 from bottom to top and leaving the reaction kettle tower 100 from the side wall of the lower kettle cavity 110, the inlet of the discharge pipe 800 being higher than the bottom of the lower kettle cavity 110 by more than 45 cm;
the air circulation device 50 includes:
a first flow divider 51, an inlet of the first flow divider 51 communicating with the exhaust gas pipe 21;
a vent pipe 52 communicating with an outlet of the first flow divider 51;
a circulation pipe 54 having an inlet and an outlet connected to and communicated with the other outlet and the inlet of the first flow divider 51, respectively;
a second flow divider 53 provided in the circulation pipe 54, an outlet of which communicates with the air pipe 52; an NMP concentration detector 55 is arranged between the first shunt 51 and the second shunt 53, and the NMP concentration detector is electrically connected with the second shunt 53;
the gas processing apparatus 30 includes:
a zeolite rotating wheel 40 which consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is positioned below the zeolite wheel 40, and the inlet of the treatment zone is communicated with a vent pipe 52; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35;
an exhaust pipe 31 connected to the treatment region 41, wherein NMP is adsorbed in the treatment region 41 when NMP-containing gas in the exhaust pipe 21 passes through the treatment region 41, and the gas is exhausted through the exhaust pipe 31;
a third diverter 56 having an inlet connected to the exhaust pipe 31;
an atmospheric air discharge pipe 34 connected to one of the outlets of the third flow divider 56;
a return pipe 32, which is connected to the other outlet of the third diverter 56, and which is connected at its end to the first diverter 51.
Specifically, as shown in fig. 2, the rotating mechanism 400 is composed of a vertical fixing member 410, a rotating shaft 420, a surrounding member 430 and a circular cover; a pair of vertical fixing members 410 fixed to both ends of the rotating mechanism 400, respectively; the rotating shaft 420 is installed through the central axis of the rotating mechanism 400 and fixed on the fixing member; the surrounding piece 430 is in a sheet shape and is connected with and fixed on the circular cover bodies at two ends of the rotating mechanism 400; the ceramic heating tube set 210 has at least one layer; the first work window 101 is positioned on the side wall of the middle kettle cavity 120; a cooler 47 and a heater 49 are further included, the cooler 47 and the heater 49 are respectively communicated with the cooling zone 43 and the regeneration zone 45; the exhaust pipe 31 is provided with an NMP concentration detector 55 electrically connected to the third shunt 56.
Specifically, the guide cylinder 500 is shaped as an inverted cone; the ceramic heating tube set 210 has one layer; the inlet of the discharge pipe 800 is 50cm higher than the bottom of the lower kettle cavity 110; the gas outlet of the cooling zone 43 is in communication with a heater 49 to reheat the cooled gas and for the regeneration zone 45 to desorb and recover the adsorbed NMP.
Specifically, the device further comprises a driving motor 600 arranged on the reaction kettle tower 100, wherein the driving motor 600 is connected with the rotating shaft 420 through a shaft so as to drive the rotating mechanism 400 to rotate; the first flow divider 51 is provided therein with an NMP concentration detector 55.
Specifically, the ceramic heating tube set 210 is semicircular in shape, and the radius thereof is greater than 5/7 of the thickness of the partition wall 140; both sides of the lower kettle cavity 110 are also provided with air blowing pipes 700, the air blowing pipes 700 are inverted L-shaped, and the outlets of the air blowing pipes 700 are opened towards the side wall of the lower kettle cavity 110 and are more than 55cm away from the side wall of the lower kettle cavity 110; the semi-circular curved surface of the ceramic heating tube set 210 faces the mid-kettle cavity 120.
Specifically, as shown in fig. 3, the upper surface of the partition wall 140 is a wavy surface 141; the semi-circular curved surface of the ceramic heating tube set 210 faces the bottom of the wavy surface 141; the device also comprises a baffle 710 close to the outlet of the gas blowing pipe 700, one end of the baffle 710 is fixed on the side wall of the lower kettle cavity 110, and the other end of the baffle 710 extends towards the direction of the partition wall 140; the baffle 710 is at 30 degrees to the ground.
One or more technical solutions provided by the present embodiment have at least the following technical effects or advantages:
the technical proposal is that the device is formed by combining an NMP reaction device 20, an air circulation device 50 and a gas treatment device 30; the NMP reaction device 20 is communicated with the air circulation device 50 through an exhaust pipe 21; the air circulation device 50 is communicated with the gas processing device 30; wherein, the zeolite rotating wheel 40 consists of a treatment zone 41, a cooling zone 43 and a regeneration zone 45; the treatment zone 41 is located below the zeolite wheel 40; the regeneration zone 45 is located above the zeolite wheel 40; cooling zone 43 is located above treatment zone 41 and below regeneration zone 45; the regeneration area 45 is connected with the coating equipment group 33 through an air return pipe 35; wherein, the apparatus further comprises a rotary mechanism 400 arranged in the lower kettle cavity 110 of the NMP reaction device 20, a partition wall 140 for separating the middle kettle cavity 120 and the lower kettle cavity 110, a guide cylinder 500 for allowing fluid to flow from the lower kettle cavity 110 to the middle kettle cavity 120, a first heating component 310 and a second heating component 320 which are respectively arranged in the lower kettle cavity 110 and the middle kettle cavity 120, and a ceramic heating tube group 210 embedded in the partition wall, wherein the middle kettle cavity 120 is provided with a first operation window 101, the bottom of the lower kettle cavity 110 is provided with a second operation window 103, and a discharge pipeline 800 which extends from the bottom to the top of the lower kettle cavity 110 and is higher than the bottom of the lower kettle cavity 110 by more than 45cm is arranged at the inlet of the reaction kettle tower 100 separated from the side wall of the lower kettle cavity 110; and a return pipe 32 connected to the other outlet of the third flow divider 56 and connected to the first flow divider 51 at the end of the gas processing apparatus 30. So that the second heating assembly 320 in the space of the middle kettle cavity 120 heats and evaporates the water in the salt-containing NMP water solution to form crystallized salt and stays above the partition wall 140 to form a middle crystallized space to avoid accumulating at the bottom of the reaction kettle tower 100; in addition, under the agitation of the rotating mechanism 400, the crystallized salt is suspended in the kettle solution without being deposited on the bottom of the lower kettle chamber 110; meanwhile, the first heating assembly 310 is nested in the rotating mechanism, the kettle liquid is heated while being stirred, the kettle for mixing salt crystals rotates, rises and enters the middle kettle cavity 120 through the guide cylinder 500, in the process of kettle liquid rising, crystals originally located in the lower kettle cavity 110 flow into the middle kettle cavity 120 along with the kettle liquid, the middle kettle cavity 120 is heated by the second heating assembly 320, and particularly under the condition that the ceramic heating tube group 210 is embedded in the partition wall 140 to reduce the heating distance and improve the heat transmission efficiency, the kettle liquid is evaporated and the saturation of the crystals is improved, so that the growth of salt crystal particles is facilitated. The liquid in the upper kettle cavity 130 can flow into the middle kettle cavity 120 along the kettle cavity wall or flow into the lower kettle cavity 110 through the guide cylinder 500 to fill the volume left by the liquid in the upper kettle cavity rising. After the distillation is finished, the rotating mechanism 400 continues to rotate, most salt crystals are suspended in the kettle liquid and are discharged out of the reaction kettle tower 100, and the requirement of shutdown cleaning is reduced. In addition, under the arrangement of the first operation window 101 and the second operation window 103, the crystallized salt is convenient to drain away, and the cleaning time is reduced. Discharge pipe 800 of drain off cauldron liquid from bottom to top is higher than the diapire, reduces the crystallization salt jam risk of deposiing in the bottom. Furthermore, when the concentration of NMP in the exhaust gas discharged from the NMP reaction device 20 has not reached a certain severity by the air circulation device 50, in order to avoid resource waste caused by low-load operation of the gas treatment device 30, the exhaust gas is circulated in the circulation pipeline 54, the concentration of the collected NMP increases as the amount of the supplemented exhaust gas increases, and when the concentration of NMP reaches a certain severity, the NMP is discharged to the gas treatment device 30 through the second flow divider 53 for treatment. In addition, the zeolite wheel 40 composed of the treating zone 41, the cooling zone 43 and the regeneration zone 45 can adsorb and recover NMP in the exhaust gas, and prevent NMP from being contained in the gas discharged to the air. Meanwhile, in order to avoid the situation that NMP is discharged into the air due to the fact that the zeolite rotating wheel 40 cannot adsorb NMP in percentage as much as possible, the gas entering the exhaust pipe 31 after passing through the zeolite rotating wheel 40 passes through the third flow divider 56, and at least a part or all of the gas divided by the third flow divider 56 enters the air circulating device 50 again for NMP content detection and flow division, so that pollution and waste caused by the fact that NMP-containing gas is discharged into the atmosphere by mistake are effectively reduced. The technical problems that equipment in the prior art is easy to block and frequent cleaning is needed to cause production efficiency to be affected and air quality to be affected and resources are wasted are effectively solved, and the technical effects that equipment blocking risks are reduced, production efficiency and air quality are improved and resources are fully utilized are achieved.
In addition, the exhaust pipe 31 is provided with an NMP concentration detector 55 electrically connected with the third shunt 56, so that the cyclic detection and classification can be effectively controlled again, and the proportion of gas discharged to the atmosphere can be effectively distributed, thereby further protecting the air quality and fully utilizing resources. The semi-circular curved surface of the ceramic heating tube assembly 210 faces the bottom of the wavy surface 141, so that the heating efficiency can be improved, and the crystallization process of the crystallized salt can be promoted to improve the production efficiency.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (6)
1. A low-pollution NMP recovery equipment is characterized in that: the device is formed by combining an NMP reaction device, an air circulation device and a gas treatment device; the NMP reaction device is communicated with the air circulation device through an exhaust pipe; the air circulation device is communicated with the gas treatment device;
the NMP reaction apparatus comprises:
the reaction kettle tower consists of a cylindrical upper kettle cavity positioned at the top of the reaction kettle tower, a middle kettle cavity positioned in the middle part of the reaction kettle tower and a lower kettle cavity positioned below the reaction kettle tower; the middle kettle cavity is provided with a first operation window; a second operation window is arranged at the bottom of the lower kettle cavity;
the partition wall is positioned between the middle kettle cavity and the lower kettle cavity and partitions the middle kettle cavity and the lower kettle cavity; a ceramic heating pipe set is embedded in the partition wall;
the guide cylinder is arranged in the center of the partition wall and is in a cylindrical or inverted cone shape;
the first heating element is arranged at the bottom close to the lower kettle cavity;
the second heating element is arranged in the middle kettle cavity and is in a round bar shape, one end of the second heating element is fixed on the kettle wall of the reaction kettle tower, and the other end of the second heating element is parallel to the ground and extends to the middle kettle cavity;
the rotating mechanism is arranged on the bottom wall close to the lower kettle cavity and is used for nesting the second heating element inside;
a steam pipe connecting inlets of the first and second heating members;
the discharge pipeline extends from the lower kettle cavity from bottom to top and leaves the reaction kettle tower from the side wall of the lower kettle cavity, and the inlet of the discharge pipeline is higher than the bottom of the lower kettle cavity by more than 45 cm;
the air circulation device includes:
a first flow divider, an inlet of said first flow divider communicating with said exhaust gas duct;
the vent pipe is communicated with an outlet of the first flow divider;
the inlet and the outlet of the circulating pipeline are respectively connected with the other outlet and the inlet of the first flow divider and communicated with each other;
the second flow divider is arranged on the circulating pipeline, and the outlet of the second flow divider is communicated with the vent pipe; an NMP concentration detector is arranged between the first shunt and the second shunt and is electrically connected with the second shunt;
the gas processing apparatus includes:
the zeolite rotating wheel consists of a treatment area, a cooling area and a regeneration area; the treatment area is positioned below the zeolite rotating wheel, and the inlet of the treatment area is communicated with the vent pipe; the regeneration zone is positioned above the zeolite rotating wheel; the cooling zone is located above the treatment zone and below the regeneration zone; the regeneration zone is connected with the coating equipment group through an air return pipe;
the exhaust pipe is connected with the treatment area, NMP is adsorbed in the treatment area when the NMP-containing gas in the exhaust pipe passes through the treatment area, and the gas is exhausted through the exhaust pipe;
the inlet of the third flow divider is connected with the exhaust pipe;
an atmosphere discharge pipe connected with one outlet of the third flow divider;
and the return pipe is connected with the other outlet of the third shunt, and the tail end of the return pipe is connected with the first shunt.
2. The low contamination NMP recovery apparatus according to claim 1, characterized in that: the rotating mechanism consists of a vertical fixing piece, a rotating shaft, a surrounding piece and a circular cover body; the pair of vertical fixing pieces are respectively fixed at two ends of the rotating mechanism; the rotating shaft is arranged on the central axis of the rotating mechanism and fixed on the fixing piece; the surrounding piece is sheet-shaped and is connected with the circle cover bodies fixed at the two ends of the rotating mechanism; the ceramic heating tube group has at least one layer; the first operation window is positioned on the side wall of the middle kettle cavity; the device also comprises a cooler and a heater, wherein the cooler and the heater are respectively communicated with the cooling area and the regeneration area; the exhaust pipe is provided with an NMP concentration detector electrically connected with the third shunt.
3. The low contamination NMP recovery apparatus according to claim 2, characterized in that: the guide cylinder is in an inverted cone shape; the ceramic heating tube group has one layer; the inlet of the discharge pipeline is 50cm higher than the bottom of the lower kettle cavity; and a gas outlet of the cooling zone is communicated with the heater so as to reheat the cooled gas and use the reheated gas in the regeneration zone to desorb and recover adsorbed NMP.
4. The low contamination NMP recovery apparatus according to claim 2, characterized in that: the driving motor is arranged on the reaction kettle tower and is connected with the rotating shaft so as to drive the rotating mechanism to rotate; and an NMP concentration detector is arranged in the first shunt.
5. The low contamination NMP recovery apparatus according to claim 1, characterized in that: the ceramic heating tube set is semicircular, and the radius of the ceramic heating tube set is more than 5/7 of the thickness of the separating wall; air blowing pipes are further arranged on two sides of the lower kettle cavity and are inverted L-shaped, and outlets of the air blowing pipes are opened towards the side wall of the lower kettle cavity and are separated from the side wall of the lower kettle cavity by more than 55 cm; the semi-circular curved surface of the ceramic heating pipe group faces the middle kettle cavity.
6. The low contamination NMP recovery apparatus according to claim 5, characterized in that: the upper surface of the partition wall is a wavy surface; the semi-circular curved surface of the ceramic heating tube set faces the bottom of the wavy surface; the device also comprises a baffle close to the outlet of the air blowing pipe, one end of the baffle is fixed on the side wall of the lower kettle cavity, and the other end of the baffle extends towards the direction of the partition wall; the baffle is 30 degrees to the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022677000.9U CN215275839U (en) | 2020-11-18 | 2020-11-18 | Low NMP recovery plant that pollutes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022677000.9U CN215275839U (en) | 2020-11-18 | 2020-11-18 | Low NMP recovery plant that pollutes |
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