Dry type filter box for VOCS waste gas treatment

Abstract

The VOCS waste gas treatment dry type filter box comprises a filter box body, an oil receiving tank, an air inlet module, a filter module, an adsorption module and an air outlet module are arranged in the filter box body from bottom to top, and a power supply box and a PLC control box are arranged in the air outlet module; the filtering module comprises a metal wire mesh, a primary filter and a medium-high efficiency filter, the adsorption module comprises an activated carbon adsorption box, and the air outlet module comprises an adsorption fan; vOCS waste gas enters from the gas inlet module, oil dirt and dust are isolated through the metal wire mesh, the primary filter and the medium-high efficiency filter under the action of the adsorption fan, then the VOCS waste gas enters the activated carbon adsorption box to be adsorbed, purified gas is discharged from the gas outlet module, the frequency of the adsorption fan is controlled in real time through the PLC control box, the waste gas inlet amount is controlled according to actual working conditions, and standard emission is ensured. The device is small, movable, fully-sealed and fully-automatic operation equipment, the overall structure is reasonable and compact, and the device has high practical value and popularization prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of VOCs waste gas treatment equipment, and particularly relates to a VOCs waste gas treatment dry filter box. BACKGROUND

[0002] VOCs (volatile organic compounds) waste gas is generated in chemical industry, printing, coating, electronics and other industries. The emission of VOCs waste gas not only pollutes the atmospheric environment, but also seriously harms human health. Dry filtration is one of the common methods for treating VOCs waste gas. The particulate matter and organic pollutants in the waste gas are intercepted and adsorbed by filter material, so as to achieve the purpose of purifying the waste gas.

[0003] At present, the existing VOCs waste gas dry filter box has the following problems: 1. The filter structure is single, usually only one or two layers of filter material are provided, and it is difficult to effectively filter pollutants of different particle sizes, so the filtering efficiency is low; 2. The filter material is fixedly installed in the box body, and when the filter material reaches saturation or is blocked, the replacement process is cumbersome, a large number of parts need to be disassembled, and the normal operation of the equipment is affected; 3. The sealing performance between the box body and the filter assembly is poor, and the unfiltered waste gas is easy to leak from the gap, which reduces the purification effect; 4. There is no effective state monitoring mechanism, and the use condition of the filter cannot be grasped in time, which may lead to that the treated waste gas is not up to standard due to the failure of the filter; 5. Some VOCs waste gas contains a large amount of oil stains and impurities, which may easily cause the filter to be blocked; 6. The traditional filter box is too large and heavy, and is not convenient to move, and cannot be used in some small places. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a VOCs waste gas treatment dry filter box, which aims to solve the technical problems in the prior art that the existing filter box cannot treat the waste gas containing oil mist generated in the production process in the room or limited space, the filter assembly is easy to be blocked and inconvenient to replace, the sealing performance between the filter assembly and the box body is poor, there is no state monitoring, and the filtering efficiency is low.

[0005] The technical scheme of the present application is as follows: a VOCs waste gas treatment dry filter box, comprising a filter box body, an oil receiving groove, an air inlet module, a filter module, an adsorption module and an air outlet module are sequentially arranged in the filter box body from bottom to top, and a power box and a PLC control box are arranged in the air outlet module.

[0006] The oil receiving groove is pullably installed at the bottom of the filter box body, and the oil receiving groove and the filter box body are sealingly installed.

[0007] The air inlet module comprises an air inlet pipe and a conical oil guide hopper arranged below the air inlet pipe, the bottom of the conical oil guide hopper is communicated with the oil receiving groove, and a temperature sensor is arranged on one side of the air inlet pipe.

[0008] The filter module comprises a filter shell, a filter mounting frame arranged in the filter shell, a wire mesh arranged in the filter mounting frame from bottom to top, a primary filter, and a medium-high efficiency filter, and a filter maintenance door is arranged on one side of the filter shell; the filter module is sealingly arranged between the filter box body, the exhaust gas introduced by the air inlet module can pass through the filter module upwards, and a first wire penetrating pipe is arranged between the air inlet module and the filter module;

[0009] The adsorption module comprises an adsorber shell, an adsorber mounting frame arranged in the adsorber shell, and an activated carbon adsorption box arranged in the adsorber mounting frame, and an adsorber maintenance door is arranged on one side of the adsorber shell; the adsorption module is sealingly arranged between the filter box body, and the exhaust gas filtered by the filter module can pass through the adsorption module upwards, and a second wire penetrating pipe is arranged between the filter module and the adsorption module;

[0010] The air outlet module comprises a fan mounting bottom plate sealingly connected with the filter box body, an adsorption fan is arranged on the fan mounting bottom plate, the exhaust gas adsorbed by the adsorption module is extracted out of the filter box body by the adsorption fan, a VOCS concentration sensor is arranged on the air outlet pipeline of the adsorption fan, a maintenance cover plate is arranged on the filter box body on one side of the adsorption fan, and a third wire penetrating pipe is arranged between the adsorption module and the air outlet module;

[0011] A first differential pressure transmitter is arranged between the air inlet end and the air outlet end of the filter module, and a second differential pressure transmitter is arranged between the air inlet end and the air outlet end of the adsorption module; the temperature sensor, the first differential pressure transmitter, the second differential pressure transmitter, the VOCS concentration sensor, the adsorption fan, and the PLC control box are connected with the power supply box; the temperature sensor, the first differential pressure transmitter, the second differential pressure transmitter, the VOCS concentration sensor, and the adsorption fan are also connected with the PLC control box.

[0012] Further, the filter box body is provided with a roller with a brake at each of the four corners of the bottom, the bearing capacity of each roller is 100 kg, the oil receiving groove comprises a groove frame, a handle groove recessed inward is arranged on the outer side of the groove frame, and an oil level observation mirror is arranged on the groove frame on one side of the handle groove.

[0013] Further, one end of the air inlet pipe is provided with an air inlet, the other end is closed, a plurality of air outlet holes are formed on the pipe body of the air inlet pipe, the air inlet is installed on the air inlet cover plate, the air inlet cover plate is fixedly connected with the filter box body through cover plate bolts, and sealing installation is arranged between the air inlet cover plate and the filter box body; the upper end of the conical oil guide funnel is fixedly connected with the four side inner walls of the filter box body, the lower end of the conical oil guide funnel is provided with an oil leakage hole, the oil leakage hole is located above the oil receiving groove; the wires connected with the temperature sensor are introduced into the top air outlet module through the first wire penetrating pipe, the second wire penetrating pipe and the third wire penetrating pipe and are connected with the power supply box and the PLC control box respectively.

[0014] Further, the filter shell is welded with the four side inner walls of the filter box body, and the first wire penetrating pipe is installed on the filter shell in a penetrating manner; three filter installation grooves are arranged in the filter installation frame in a vertically spaced manner, and the metal wire mesh, the primary filter and the medium-high efficiency filter are respectively inserted into the three filter installation grooves; the filter maintenance door comprises a maintenance door cover, one end of the maintenance door cover is rotationally connected with the filter shell through a spring bolt, and the other end of the maintenance door cover is locked with the filter installation frame through a hand screw; a first threaded locking hole connected with the hand screw is arranged on the filter installation frame, a sealing strip is arranged on the inner side of the maintenance door cover, and a maintenance door buckle recessed inward is further arranged on the outer side of the maintenance door cover.

[0015] Further, the opening size of the metal wire mesh is 30-90 meshes, and the number of layers of the metal wire mesh is 5-10 layers; the primary filter adopts a G4 plate filter, and the medium-high efficiency filter adopts any one of F6, F7, F9 and H10 plate filters, and the thickness of the primary filter and the medium-high efficiency filter is 46 mm.

[0016] Further, the adsorber shell is welded with the four side inner walls of the filter box body, and the second wire penetrating pipe is installed on the adsorber shell in a penetrating manner; an adsorber installation groove for placing the activated carbon adsorption box is arranged in the adsorber installation frame, and a second threaded locking hole is arranged on the adsorber installation frame; the activated carbon adsorption box comprises an adsorption box shell, a mesh plate fixedly connected with the adsorption box shell through a tightening screw, and activated carbon particles arranged in the adsorption box shell.

[0017] Further, the mesh plate has a mesh size of 2-3 mm, and a center distance between the meshes of 4-5 mm; the activated carbon particles are waterproof activated carbon particles, the filling height of the activated carbon particles is 150-300 mm, the iodine value of the activated carbon particles is ≥800 mg / g, and the specific surface area of the activated carbon particles is ≥850 m2 / g.

[0018] Further, the third wire pipe is arranged on the fan mounting bottom plate, the air inlet pipe of the adsorption fan is sealingly connected to the fan mounting bottom plate through a rubber sealing gasket, the air outlet pipe of the adsorption fan has an air outlet opening, the air outlet opening is arranged on an air outlet cover plate, the air outlet cover plate is fixedly connected to the filter box body, and the air outlet cover plate and the maintenance cover plate are sealingly arranged between the filter box body.

[0019] Further, the power supply box comprises a power supply shell embedded in the filter box body and a power supply shell cover arranged at the outer edge of the power supply shell, the power supply shell cover is arranged on the outer wall of the filter box body and sealingly arranged between the filter box body, the power supply shell is provided with an air circuit breaker and a power supply converter, and the power cable connector, the air circuit breaker and the power supply converter are sequentially connected.

[0020] Further, the PLC control box comprises a control box shell embedded in the filter box body and an internal sealing cover arranged in the control box shell, the internal sealing cover is sealingly arranged between the filter box body, the control box shell is provided with a PLC industrial computer, the control box shell is provided with a cable connector connected to the PLC industrial computer and a plurality of aircraft plugs, and the filter box body is further provided with a switchable PLC maintenance door covering the PLC industrial computer, and the PLC maintenance door is provided with a maintenance door glass.

[0021] Compared with the prior art, the present application has the following advantages: the present application provides a VOCS waste gas treatment dry filter box, which optimizes the structure design, improves the filtering efficiency, simplifies the filter replacement process and enhances the sealing performance, and additionally provides a variety of state monitoring functions to meet the treatment needs of actual waste gas in various scenes, especially for indoor laboratories and various limited spaces; the VOCS waste gas treatment dry filter box is a small device, which is a mobile, fully sealed and fully automated integrated device, has an attractive appearance, a reasonable and compact overall structure, and is convenient to operate, and has high practical value and popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0023] Figure 2 Fig. 1 is a schematic diagram of the front view of the present application;

[0024] Figure 3 Fig. 2 is a schematic diagram of the detailed structure of the oil receiving groove in the present application;

[0025] Figure 4 Fig. 3 is a schematic diagram of the detailed structure of the filter mounting frame in the present application;

[0026] Figure 5 Fig. 4 is a schematic diagram of the detailed structure of the filter access door in the present application;

[0027] Figure 6 Fig. 5 is a schematic diagram of the detailed structure of the adsorber mounting frame in the present application;

[0028] Figure 7 Fig. 6 is a schematic diagram of the detailed structure of the activated carbon adsorption box in the present application.

[0029] Wherein:

[0030] 1. Filter box body;

[0031] 2. Oil receiving groove; 201, oil groove frame; 202, handle groove; 203, oil level observation mirror;

[0032] 3. Air inlet module; 301, air inlet pipe; 301a, air inlet; 301b, air outlet hole; 302, air inlet cover plate; 303, cover plate bolt; 304, conical oil guide funnel; 304a, oil leakage hole; 305, temperature sensor;

[0033] 4. Filter module; 401, filter shell; 402, filter mounting frame; 402a, filter mounting groove; 402b, first threaded locking hole; 403, wire mesh; 404, primary efficiency filter; 405, medium-high efficiency filter; 406, filter access door; 4061, access door cover; 4062, spring latch; 4063, hand screw; 4064, sealing strip; 4065, access door buckle;

[0034] 5. Adsorption module; 501, adsorber shell; 502, adsorber mounting frame; 502a, adsorber mounting groove; 502b, second threaded locking hole; 503, activated carbon adsorption box; 5031, adsorption box shell; 5032, tightening screw; 5033, mesh plate; 5034, activated carbon particles; 504, adsorber access door;

[0035] 6. Air outlet module; 601, fan mounting bottom plate; 602, adsorption fan; 603, rubber sealing gasket; 604, air outlet; 605, air outlet cover plate; 606, VOCS concentration sensor; 607, access cover plate; 608, power cable joint;

[0036] 7, power supply box; 701, power supply shell; 702, power supply shell cover; 703, air circuit breaker; 704, power converter;

[0037] 8, PLC control box; 801, control box shell; 802, internal sealing cover; 803, PLC industrial computer; 804, aircraft carrier plug; 805, PLC access door; 806, access door glass;

[0038] 9, first wire tube; 10, second wire tube; 11, third wire tube;

[0039] 12, roller. DETAILED DESCRIPTION

[0040] The specific embodiments of the application are described below in conjunction with the accompanying drawings.

[0041] Embodiment:

[0042] The specific embodiments of the application are described below in conjunction with the accompanying drawings. Figure 1 、 Figure 2 The filter box is composed of eight parts, which mainly include a filter box body 1, an oil receiving groove 2, an air inlet module 3, a filter module 4, an adsorption module 5, and an air outlet module 6 arranged in the filter box body 1 from bottom to top, and a power supply box 7 and a PLC control box 8 arranged in the air outlet module 6. Among them, the power supply box 7 and the PLC control box 8 belong to the electric control module.

[0043] After the VOCs exhaust gas enters from the air inlet module 3, it passes through the filter module 4 and the adsorption module 5 from bottom to top, and is finally discharged from the air outlet module 6. The filter module 4 intercepts oil stains and particles in the exhaust gas, and the oil stains flow down along the wall and finally flow into the oil receiving groove 2; the exhaust gas after passing through the filter module 4 enters the adsorption module 5, most of the VOCs in the exhaust gas are absorbed, and finally the clean air is discharged from the top air outlet module 6.

[0044] Specifically, the structure of the filter box body 1 is that the filter box body 1 is a cuboid structure, the overall appearance is flat, and the filter box body 1 is provided with rollers 12 with brakes at the bottom corners. The bearing capacity of each roller 12 is 100 kg, and it is not easy to be damaged. The roller 12 makes the filter box body 1 move conveniently, and can be quickly moved to the equipment generating exhaust gas, so as to treat the VOCs exhaust gas generated by the production equipment on site.

[0045] The oil receiving groove 2 is pullably installed at the bottom of the filter box body 1, and an opening for pulling is arranged at one side of the bottom of the filter box body 1. The oil receiving groove 2 can be inserted into the inside of the filter box body 1 through the opening. In combination with Figure 3As shown, the specific structure of the oil receiving tank 2 is as follows: the oil receiving tank 2 includes an oil tank frame 201, which is a rectangular structure with an internal cavity for receiving oil. The outer side of the oil tank frame 201 is provided with an inwardly recessed handle groove 202, which is integrally formed with the oil tank frame 201 and can be used as a convenient handle. The oil tank frame 201 can be pulled out simply by inserting a hand into the handle groove 202. An oil level observation mirror 203 is provided on the oil tank frame 201 on one side of the handle groove 202. The oil level observation mirror 203 can be locked to the oil tank frame 201 with screws. The oil level observation mirror 203 and the oil tank frame 201 are sealed together to prevent leakage. When the oil level in the oil tank frame 201 exceeds the oil level observation mirror 203, pull out the oil tank frame 201 in time to remove the oil. Two guide rails can be installed at the bottom of the oil tank frame 201, and matching guide grooves are provided inside the filter box body 1 to facilitate pushing and pulling to clean the oil. In addition, to ensure sealing, the oil receiving tank 2 and the filter box body 1 are sealed together. This can be achieved by placing sealing gaskets on the contact surfaces of the oil tank frame 201 and the filter box body 1, or on the contact surfaces of the filter box body 1 and the oil tank frame 201.

[0046] The intake module 3 is located above the oil receiving tank 2, as shown in the reference. Figure 1 , Figure 2 The intake module 3 includes an intake pipe 301, with an intake port 301a at one end and a closed end at the other. Several exhaust holes 301b are formed on the pipe body of the intake pipe 301, with the diameter of the exhaust holes 301b gradually increasing from the intake port 301a to the other end, allowing the incoming VOCs exhaust gas to be evenly dispersed from the exhaust holes 301b and enter the next stage filter module 4 more uniformly. The intake port 301a is mounted on an intake cover plate 302, which is fixedly connected to the filter box body 1 by cover bolts 303. Similarly, an opening for inserting the intake pipe 301 is formed on the side wall of the filter box body 1. The intake pipe 301 can be inserted into the filter box body 1 through this opening, and the intake cover plate 302 covers the opening and is locked to the filter box body 1 by cover bolts 303. To ensure a tight seal, the air intake cover 302 is sealed to the filter housing 1. This can be achieved by placing a sealing gasket on either the contact surface between the air intake cover 302 and the filter housing 1, or on the contact surface between the filter housing 1 and the air intake cover 302. The air inlet 301a of the air intake pipe 301 is located on the air intake cover 302, and the air intake pipe 301 is embedded, ensuring the overall aesthetic appearance of the filter housing 1.

[0047] A conical oil guide funnel 304 is provided below the air intake pipe 301. The upper end of the conical oil guide funnel 304 is fixedly connected to the four inner walls of the filter box 1, which can be done by welding. The lower end of the conical oil guide funnel 304 is provided with an oil leakage hole 304a, which is located above the oil receiving groove 2. The bottom of the conical oil guide funnel 304 is connected to the oil receiving groove 2. The oil sludge filtered by the filter module 4 will flow down the inner wall of the filter box 1 and flow smoothly into the oil receiving groove 2 at the bottom through the oil leakage hole 304a of the conical oil guide funnel 304 for collection.

[0048] A temperature sensor 305 is also provided on one side of the air intake pipe 301. The temperature sensor 305 can be fastened to a mounting plate with screws, and then the mounting plate is fixed to the inner wall of the filter box 1. The temperature sensor 305 is used to detect the intake air temperature in real time. When the intake air temperature is too high, it is not conducive to the upper adsorption module 5 adsorbing the exhaust gas.

[0049] The filter module 4 is located above the intake module 3, as shown in the reference. Figure 1 , Figure 2 , Figure 4 , Figure 5 The filter module 4 includes a filter housing 401, which is welded to the four inner walls of the filter box 1 to ensure that gas does not leak from the edges of the filter housing 401. The filter housing 401 has a hollow center, and a filter mounting frame 402 is provided inside the filter housing 401. The structure of the filter mounting frame 402 is as follows... Figure 4 As shown, the filter mounting frame 402 has three filter mounting slots 402a spaced vertically. A metal wire mesh 403, a pre-filter 404, and a medium-high efficiency filter 405 are inserted into the three filter mounting slots 402a from bottom to top. The metal wire mesh 403, the pre-filter 404, and the medium-high efficiency filter 405 can all be removed and replaced. The filter mounting frame 402 can also be removed from the filter housing 401.

[0050] The metal mesh 403 has 5 layers, and the opening size of the metal mesh 403 is 40 mesh to 60 mesh. The pre-filter 404 is a G4 plate filter. The medium and high efficiency filter 405 is any one of the F6, F7, F9, and H10 plate filters. The thickness of both the pre-filter 404 and the medium and high efficiency filter 405 is 46 mm.

[0051] To facilitate the replacement of the wire mesh 403, pre-filter 404, and medium / high-efficiency filter 405, a switchable filter access door 406 is provided on one side of the filter housing 401. Combined with... Figure 1 , Figure 4 , Figure 5, the filter maintenance door 406 includes a maintenance door cover 4061, one end of the maintenance door cover 4061 is rotatably connected to the filter shell 401 through two spring latches 4062, the spring latches 4062 are prior art, and will not be described here, under the action of the spring latches 4062, the maintenance door cover 4061 can be rotatably opened and closed. The other end of the maintenance door cover 4061 is locked and connected to the filter mounting frame 402 through two hand screws 4063, the hand screws 4063 are rotatably connected to the outer side of the maintenance door cover 4061, and the filter mounting frame 402 is provided with two first threaded locking holes 402b corresponding to the two hand screws 4063, as shown in Figure 4 When the filter maintenance door 406 needs to be opened, the hand screws 4063 on the maintenance door cover 4061 are screwed, so that the threaded segments of the hand screws 4063 are screwed out of the first threaded locking holes 402b of the filter mounting frame 402, that is, the maintenance door cover 4061 can be unlocked, and in the same way, the hand screws 4063 are reversely screwed to quickly lock and close the maintenance door cover 4061, so that the internal wire mesh 403 or the filter can be replaced. In order to ensure the sealing performance of the maintenance door cover 4061 when it is closed, a sealing strip 4064 is arranged on the inner side of the maintenance door cover 4061, the material of the sealing strip 4064 is preferably soft rubber, which has certain flexibility and oil corrosion resistance, and after the maintenance door cover 4061 is closed, the sealing strip 4064 can be tightly sealed to the filter mounting frame 402, so that the inside of the filter box body 1 is completely sealed. The outer side of the maintenance door cover 4061 is also provided with a concave maintenance door buckle 4065, which facilitates the hand to quickly open the maintenance door cover 4061.

[0052] The exhaust gas introduced by the air inlet module 3 can pass through the filter module 4 upwards, and a first wire penetrating pipe 9 is arranged between the air inlet module 3 and the filter module 4, the first wire penetrating pipe 9 is penetratingly arranged on the filter shell 401, and the first wire penetrating pipe 9 is sealingly arranged between the filter shell 401, so as to avoid gas leakage. The first wire penetrating pipe 9 is used for leading wires to the upper layer, after the wires are penetrated into the first wire penetrating pipe 9, the two ends of the first wire penetrating pipe 9 can be sealed by a sealing plug, so as to further prevent gas from leaking from the first wire penetrating pipe 9, and the filtering effect is ensured.

[0053] The adsorption module 5 is arranged above the filter module 4, referring to Figure 1 , Figure 2 , Figure 6 , Figure 7 The adsorption module 5 includes an adsorber shell 501, the adsorber shell 501 is welded and connected to the four inner walls of the filter box body 1, so as to ensure that the gas cannot leak from the edge of the adsorber shell 501. The middle part of the adsorber shell 501 is hollow, and the adsorber shell 501 is provided with an adsorber mounting frame 502, and the structure of the adsorber mounting frame 502 is as shown in Figure 6As shown, the adsorber mounting frame 502 is provided with an adsorber mounting groove 502a, and the adsorber mounting groove 502a is provided with an activated carbon adsorption box 503, which can be taken out and replaced, and the adsorber mounting frame 502 can also be taken out from the adsorber shell 501.

[0054] In combination Figure 7 The specific structure of the activated carbon adsorption box 503 is that the activated carbon adsorption box 503 comprises an adsorption box shell 5031, the inside of the adsorption box shell 5031 is hollow, and each of the upper and lower sides of the adsorption box shell 5031 is provided with a mesh plate 5033, and the activated carbon particles 5034 are arranged in the adsorption box shell 5031. Each mesh plate 5033 is locked and fixed at the four corners of the adsorption box shell 5031 through four tightening screws 5032, and the mesh plate 5033 is fastened to the adsorption box shell 5031 through the four tightening screws 5032, so as to facilitate the disassembly and replacement of the activated carbon particles 5034. The size of the mesh of the mesh plate 5033 is 2-3 mm, and the center distance between the meshes is 4-5 mm, so that the exhaust gas can enter the activated carbon while ensuring the support of the activated carbon particles 5034. The activated carbon particles 5034 are waterproof activated carbon particles, the particles are columnar, the diameter of the activated carbon particles 5034 is ≤3 mm, the iodine value is 850 mg / g, the filling height of the activated carbon particles 5034 is 150 mm, and the specific surface area of the activated carbon particles 5034 is ≥850 m2 / g, so that the VOCS exhaust gas can be completely absorbed by the activated carbon, thereby achieving the purification effect.

[0055] In order to facilitate the replacement of the activated carbon particles 5034, an adsorber maintenance door 504 which can be opened and closed is arranged on one side of the adsorber shell 501, when the activated carbon particles 5034 are saturated, the adsorber maintenance door 504 is opened, the activated carbon adsorption box 503 is taken out, and the internal activated carbon particles 5034 are replaced. The structure and opening and closing mode of the adsorber maintenance door 504 are the same as those of the filter maintenance door 406, and similarly, Figure 6 As shown, two second threaded locking holes 502b are arranged on the adsorber mounting frame 502, and the opening and closing of the adsorber maintenance door 504 is realized by the cooperation of the hand-tightening screw and the second threaded locking hole 502b. The adsorber maintenance door 504 is also provided with a sealing strip and a maintenance door buckle, so as to ensure that the inside of the filter box body 1 is completely sealed after being closed, and the adsorber maintenance door 504 can be quickly opened.

[0056] The waste gas filtered by filter module 4 can pass upward through adsorption module 5. A second conduit 10 is provided between filter module 4 and adsorption module 5. The second conduit 10 is installed on the adsorber housing 501 and is sealed to prevent gas leakage. The second conduit 10 is used to lead the wire to the upper layer. After the wire is inserted into the second conduit 10, both ends of the second conduit 10 can be sealed with a sealing plug to further prevent gas leakage from the second conduit 10 and ensure the filtration effect.

[0057] The gas outlet module 6 is located above the adsorption module 5, as shown in the reference. Figure 1 , Figure 2 The exhaust module 6 includes a fan mounting base plate 601 that is sealed to the filter box body 1. The four sides of the fan mounting base plate 601 are welded to the four inner walls of the filter box body 1 to ensure that gas will not leak from the edges of the fan mounting base plate 601. An adsorption fan 602 is installed on the fan mounting base plate 601. The air inlet pipe of the adsorption fan 602 is sealed to the fan mounting base plate 601 through a rubber sealing gasket 603 to ensure that gas will not leak and will be completely drawn into the adsorption fan 602 through the air inlet pipe. The air outlet duct of the adsorption fan 602 has an air outlet 604, which is mounted on an air outlet cover 605. The air outlet cover 605 is fixedly connected to the filter box body 1. An opening for inserting the air outlet 604 is provided on the side wall of the filter box body 1. The air outlet 604 can be inserted into the interior of the filter box body 1 through this opening, and the air outlet cover 605 covers the opening and can be locked to the filter box body 1 by locking components such as bolts. To ensure airtightness, the air outlet cover 605 and the filter box body 1 are sealed together. This can be achieved by placing a sealing gasket on the contact surface between the air outlet cover 605 and the filter box body 1, or on the contact surface between the filter box body 1 and the air outlet cover 605. The air outlet 604 of the air outlet duct is located on the air outlet cover 605, and the air outlet duct is embedded, ensuring the overall aesthetic appearance of the filter box body 1.

[0058] In this embodiment, the adsorption fan 602 is a variable frequency fan, and the air pressure is preferably 500 Pa. The air outlet pipeline of the adsorption fan 602 is also provided with a VOCS concentration sensor 606 for real-time detection of the treated exhaust gas up to standard. A filter box body 1 on one side of the adsorption fan 602 is also provided with an openable and closable maintenance cover plate 607. The maintenance cover plate 607 can be fixed to the filter box body 1 by screws. The maintenance cover plate 607 and the filter box body 1 are also sealed and installed. A sealing gasket can be provided on the contact surface between the maintenance cover plate 607 and the filter box body 1 or on the contact surface between the filter box body 1 and the maintenance cover plate 607 to ensure the sealing between the maintenance cover plate 607 and the filter box body 1 and prevent gas leakage. The maintenance cover plate 607 facilitates the maintenance of the adsorption fan 602 and the internal wiring. The filter box body 1 above the maintenance cover plate 607 is also provided with a power cable joint 608 for connecting an external power supply to power the entire device.

[0059] The exhaust gas adsorbed by the adsorption module 5 is drawn out of the filter box body 1 by the adsorption fan 602. A third wire penetrating pipe 11 is provided between the adsorption module 5 and the gas outlet module 6. The third wire penetrating pipe 11 is installed on the fan installation bottom plate 601 and is sealed and installed between the third wire penetrating pipe 11 and the fan installation bottom plate 601 to prevent gas leakage. After the wire is inserted into the third wire penetrating pipe 11, the both ends of the third wire penetrating pipe 11 can be sealed by a sealing plug to further prevent gas leakage and ensure the adsorption effect.

[0060] The power supply box 7 and the PLC control box 8 are both arranged in the gas outlet module 6. The power supply box 7 is used to power the entire device, and the PLC control box 8 is used to control the operation of the device.

[0061] Referring to Figure 1 , Figure 2 The power supply box 7 includes a power supply shell 701 embedded in the filter box body 1 and a power supply shell cover 702 arranged on the outer edge of the power supply shell 701. Similarly, an opening is formed in the side wall of the filter box body 1 for accommodating the power supply shell 701. The power supply shell 701 can be accommodated in the filter box body 1 through the opening, and the power supply shell cover 702 covers the opening and can be locked and connected with the outer wall of the filter box body 1 by bolts. In order to ensure the sealing, the power supply shell cover 702 and the filter box body 1 are sealed and installed. A sealing gasket can be provided on the contact surface between the power supply shell cover 702 and the filter box body 1 or on the contact surface between the filter box body 1 and the power supply shell cover 702 to ensure the sealing between the power supply shell cover 702 and the filter box body 1 and ensure that the inside of the filter box body 1 is completely sealed.

[0062] The air circuit breaker 703 is provided with a leakage protector, and the power converter 704 is a 220V-to-24V power switch. The power cable joint 608, the air circuit breaker 703 and the power converter 704 are sequentially connected by wires, and the power converter 704 is connected to each electrical instrument by wires to supply power to the entire device.

[0063] The PLC control box 8 comprises a control box shell 801 embeddedly installed in the filter box body 1 and an internal sealing cover 802 arranged in the control box shell 801. An inwardly recessed cavity is formed in the sidewall of the top of the filter box body 1, and an opening is arranged at the bottom of the cavity. The control box shell 801 is arranged in the cavity, and the internal sealing cover 802 covers the opening and is connected to the filter box body 1 by welding, thereby ensuring the installation sealing and completely sealing the inside of the filter box body 1.

[0064] The control box shell 801 is provided with a cable joint and a plurality of aircraft plugs 804 connected to the PLC industrial computer 803. The cable joint and the plurality of aircraft plugs 804 are arranged in the filter box body 1 at the rear side of the opening, thereby ensuring the electrical connection and the sealing of the entire device. The cable joint is used to connect the power supply, and the aircraft plugs 804 are used to connect various instruments to realize data transmission. The filter box body 1 is further provided with a switchable PLC maintenance door 805 covering the PLC industrial computer 803. Similarly, the main structure and the switching mode of the PLC maintenance door 805 are the same as those of the foregoing filter maintenance door 406, and the PLC maintenance door 805 is further provided with a maintenance door glass 806 for observation.

[0065] In the embodiment, a first differential pressure transmitter is arranged between the air inlet end and the air outlet end of the filter module 4, and a second differential pressure transmitter is arranged between the air inlet end and the air outlet end of the adsorption module 5. The structure and the installation and use mode of the differential pressure transmitter are prior art, and will not be described herein again. The wires of the differential pressure transmitter are led to the top and connected to the power supply box 7 and the PLC control box 8 through the corresponding wire pipes.

[0066] The temperature sensor 305, the first differential pressure transmitter, the second differential pressure transmitter, the VOCs concentration sensor 606, the adsorption fan 602 and the PLC industrial computer 803 of the PLC control box 8 are connected to the power converter 704 of the power supply box 7. The temperature sensor 305, the first differential pressure transmitter, the second differential pressure transmitter, the VOCs concentration sensor 606 and the adsorption fan 602 are further connected to the PLC industrial computer 803 of the PLC control box 8. The PLC industrial computer 803 receives the signals given by each unit and outputs a signal to control the frequency of the adsorption fan 602 to ensure the normal operation of the entire device.

[0067] The electric wire of the temperature sensor 305 is introduced into the top air outlet module 6 through the first wire tube 9, the second wire tube 10 and the third wire tube 11 to be connected with the power box 7 and the PLC control box 8 respectively, and the electric wire of the first differential pressure transmitter and the second differential pressure transmitter is also introduced into the top to be connected with the power box 7 and the PLC control box 8 through the corresponding wire tube.

[0068] When the VOCs waste gas is introduced into the device, the PLC industrial computer 803 can display the temperature of the entering waste gas, the differential pressure of the filter module 4, the differential pressure of the adsorption module 5 and the concentration value of the VOCs contained in the outlet waste gas in real time. When the temperature is greater than 40 degrees, the PLC industrial computer 803 automatically controls to reduce the frequency of the top fan 803 to reduce the air intake amount and the air intake temperature. When the temperature is too high, the adsorption module 5 cannot adsorb the VOCs waste gas. When the differential pressure is too large or the concentration value is too high, the system alarms to remind the worker to replace the filter or the activated carbon particles 5034.

[0069] Application example: a small high-temperature oven device in a laboratory, which generates VOCs waste gas with an exhaust gas volume of 50 Nm 3 / h and a VOCs concentration of 200 mg / m 3 . The overall treatment air volume range of the VOCs waste gas treatment dry filter box designed by the application is 0-100 m 3 / h, the overall size of the device is 0.43 m x 0.43 m x 1.3 m, the device is small and convenient, and the outlet waste gas concentration is 20 mg / m 3 after the device is connected to the waste gas and one-key started and stably operated, which meets the discharge standard, and the filter and the activated carbon are very fast to replace, solves the problem of fixed-point treatment of small air volume waste gas in some laboratories, and the operation cost is very low, and the device stably operates for more than one year.

[0070] Of course, the above embodiments are only for illustrating the technical concept and characteristics of the application, the purpose is to enable those skilled in the art to understand the content of the application and implement it, and cannot limit the protection scope of the application. Any modification made according to the spirit and essence of the main technical solution of the application should be covered within the protection scope of the application.

Claims

1. A dry filter box for VOCs exhaust gas treatment, characterized in that: The filter box includes a filter box body (1), and the filter box body (1) is provided with an oil receiving tank (2), an air inlet module (3), a filter module (4), an adsorption module (5), and an air outlet module (6) from bottom to top. The air outlet module (6) is provided with a power supply box (7) and a PLC control box (8). The oil receiving groove (2) is removably installed at the bottom of the filter box body (1), and the oil receiving groove (2) is sealed to the filter box body (1). The air intake module (3) includes an air intake pipe (301) and a conical oil funnel (304) located below the air intake pipe (301). The bottom of the conical oil funnel (304) is connected to the oil receiving groove (2). A temperature sensor (305) is provided on one side of the air intake pipe (301). The filter module (4) includes a filter housing (401), a filter mounting frame (402) disposed inside the filter housing (401), a metal wire mesh (403) detachably disposed in the filter mounting frame (402) from bottom to top, a pre-filter (404), and a medium-high efficiency filter (405). A switchable filter maintenance door (406) is provided on one side of the filter housing (401). The filter module (4) is sealed to the filter box body (1). The exhaust gas introduced by the air intake module (3) can pass upward through the filter module (4). A first conduit (9) is provided between the air intake module (3) and the filter module (4). The adsorption module (5) includes an adsorber housing (501), an adsorber mounting frame (502) disposed within the adsorber housing (501), and an activated carbon adsorption box (503) detachably disposed within the adsorber mounting frame (502). An adsorber maintenance door (504) that can be opened and closed is provided on one side of the adsorber housing (501). The adsorption module (5) is sealed to the filter box (1). The waste gas filtered by the filter module (4) can pass upward through the adsorption module (5). A second conduit (10) is provided between the filter module (4) and the adsorption module (5). The exhaust module (6) includes a fan mounting base plate (601) that is sealed to the filter box body (1). An adsorption fan (602) is provided on the fan mounting base plate (601). The waste gas adsorbed by the adsorption module (5) is extracted from the filter box body (1) by the adsorption fan (602). A VOCs concentration sensor (606) is provided on the air outlet pipe of the adsorption fan (602). A switchable maintenance cover plate (607) is provided on the filter box body (1) on one side of the adsorption fan (602). A third conduit (11) is provided between the adsorption module (5) and the exhaust module (6). A first differential pressure transmitter is provided between the air inlet and the air outlet of the filter module (4), and a second differential pressure transmitter is provided between the air inlet and the air outlet of the adsorption module (5); the temperature sensor (305), the first differential pressure transmitter, the second differential pressure transmitter, the VOCs concentration sensor (606), the adsorption fan (602), and the PLC control box (8) are all connected to the power supply box (7); the temperature sensor (305), the first differential pressure transmitter, the second differential pressure transmitter, the VOCs concentration sensor (606), and the adsorption fan (602) are also connected to the PLC control box (8).

2. The dry filter box for VOCs exhaust gas treatment according to claim 1, characterized in that: The filter box body (1) is provided with braked rollers (12) at the four corners of the bottom. Each roller (12) has a load-bearing capacity of 100kg. The oil receiving tank (2) includes an oil tank frame (201). The outer side of the oil tank frame (201) is provided with an inwardly recessed handle groove (202). An oil level observation mirror (203) is provided on the oil tank frame (201) on one side of the handle groove (202).

3. The dry filter box for VOCs exhaust gas treatment according to claim 1, characterized in that: The air intake pipe (301) has an air inlet (301a) at one end and is closed at the other end. Several air outlets (301b) are opened on the pipe body of the air intake pipe (301). The air inlet (301a) is installed on the air intake cover plate (302). The air intake cover plate (302) is fixedly connected to the filter box body (1) by cover plate bolts (303). The air intake cover plate (302) and the filter box body (1) are sealed together. The conical oil guide funnel (304)... The upper end is fixedly connected to the four inner walls of the filter box body (1). The lower end of the conical oil funnel (304) is provided with an oil leakage hole (304a), which is located above the oil receiving groove (2). The wire connected to the temperature sensor (305) is introduced into the top air outlet module (6) through the first conduit (9), the second conduit (10), and the third conduit (11) and connected to the power supply box (7) and the PLC control box (8) respectively.

4. The dry filter box for VOCs exhaust gas treatment according to claim 1, characterized in that: The filter housing (401) is welded to the four inner walls of the filter box (1), and the first conduit (9) is installed on the filter housing (401); the filter mounting frame (402) is provided with three vertically spaced filter mounting slots (402a), and the metal wire mesh (403), the pre-filter (404), and the medium- and high-efficiency filters (405) are respectively inserted into the three filter mounting slots (402a); the filter maintenance door (406) includes a maintenance door cover (4061), and the maintenance door cover (4061) is... One end of the inspection door cover (4061) is rotatably connected to the filter housing (401) via a spring pin (4062), and the other end of the inspection door cover (4061) is locked to the filter mounting frame (402) via a hand screw (4063). The filter mounting frame (402) is provided with a first threaded locking hole (402b) connected to the hand screw (4063). The inner side of the inspection door cover (4061) is provided with a sealing strip (4064), and the outer side of the inspection door cover (4061) is also provided with an inwardly recessed inspection door buckle (4065).

5. A dry filter box for VOCs exhaust gas treatment according to claim 4, characterized in that: The opening size of the metal wire mesh (403) is 30 mesh to 90 mesh, and the number of layers of the metal wire mesh (403) is 5 to 10 layers; the primary filter (404) is a G4 plate filter, and the medium and high efficiency filter (405) is any one of F6, F7, F9, and H10 plate filters; the thickness of the primary filter (404) and the medium and high efficiency filter (405) is 46 mm.

6. A dry filter box for VOCs exhaust gas treatment according to claim 1, characterized in that: The adsorber housing (501) is welded to the inner walls of the four sides of the filter box (1), and the second conduit (10) is installed on the adsorber housing (501). The adsorber mounting frame (502) is provided with an adsorber mounting groove (502a) for placing the activated carbon adsorption box (503), and the adsorber mounting frame (502) is provided with a second threaded locking hole (502b). The activated carbon adsorption box (503) includes an adsorption box housing (5031), a perforated plate (5033) connected and fixed to the adsorption box housing (5031) by tightening screws (5032), and activated carbon particles (5034) disposed in the adsorption box housing (5031).

7. A dry filter box for VOCs exhaust gas treatment according to claim 6, characterized in that: The mesh size of the perforated plate (5033) is 2-3 mm, and the center-to-center distance between the meshes is 4-5 mm; the activated carbon particles (5034) are waterproof activated carbon particles, the filling height of the activated carbon particles (5034) is 150 mm-300 mm, the iodine value of the activated carbon particles (5034) is ≥800 mg / g, and the specific surface area of ​​the activated carbon particles (5034) is ≥850 m² / g.

8. A dry filter box for VOCs exhaust gas treatment according to claim 1, characterized in that: The third conduit (11) is installed on the fan mounting base plate (601). The air inlet pipe of the adsorption fan (602) is sealed to the fan mounting base plate (601) through a rubber sealing gasket (603). The air outlet pipe of the adsorption fan (602) has an air outlet (604). The air outlet (604) is installed on the air outlet cover plate (605). The air outlet cover plate (605) is fixedly connected to the filter box body (1). The air outlet cover plate (605) and the maintenance cover plate (607) are both sealed to the filter box body (1). A power cable connector (608) is also provided on the filter box body (1) above the maintenance cover plate (607).

9. A dry filter box for VOCs exhaust gas treatment according to claim 8, characterized in that: The power supply box (7) includes a power supply housing (701) embedded in the filter box body (1) and a power supply housing cover (702) located on the outer edge of the power supply housing (701). The power supply housing cover (702) covers and is installed on the outer wall of the filter box body (1) and is sealed between the filter box body (1). An air circuit breaker (703) and a power converter (704) are provided inside the power supply housing (701). The power cable connector (608), the air circuit breaker (703), and the power converter (704) are connected in sequence.

10. A dry filter box for VOCs exhaust gas treatment according to claim 9, characterized in that: The PLC control box (8) includes a control box housing (801) embedded in the filter box housing (1) and an internal sealing cover (802) located inside the control box housing (801). The internal sealing cover (802) is sealed to the filter box housing (1). The control box housing (801) contains a PLC industrial computer (803). The control box housing (801) is provided with a cable connector for connecting to the PLC industrial computer (803) and multiple aircraft carrier plugs (804). The filter box housing (1) is also provided with an openable PLC maintenance door (805) covering the PLC industrial computer (803). The PLC maintenance door (805) is provided with maintenance door glass (806).

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