A VOC exhaust gas pretreatment device

Abstract

The utility model discloses a VOC waste gas pretreatment device, including filter box, the air inlet pipe and the air outlet pipe respectively being equipped with the both ends of filter box and being equipped with the filter plate in filter box, be provided with cleaning unit in the filter box, the cleaning unit includes adsorption cover, adsorption cover elevating is equipped with the one side end face of filter plate towards air inlet pipe to realize the adsorption cleaning of the impurity that sticks on filter plate, the utility model discloses a adsorption cover that can along the surface of filter plate elevating is set up, and cooperate external dust extraction equipment, has realized the on -line efficient cleaning of the impurity of filter plate windward surface, need not stop machine dismounting, has prolonged the service life of filter plate significantly and reduced maintenance cost, simultaneously, the vibration motor integrated in the device can produce high frequency microvibration in the cleaning process, and stubborn particle is shaken loose effectively, makes the cleaning more completely, through guide groove, ball and the symmetrical arrangement of lifting pull rope structure, has guaranteed the smooth and reliable of adsorption cover operation process.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a VOC waste gas pretreatment device. Background Technology

[0002] Volatile organic compounds (VOCs) are a major source of air pollution, posing a serious threat to both the environment and human health. In existing technologies, pretreatment of VOCs using activated carbon adsorption materials is a common method. For example, Chinese utility model patent CN216171187U discloses an industrial waste gas treatment device with a built-in activated carbon adsorption structure, which uses an internal activated carbon filter plate to adsorb and filter waste gas. Although the device has a simple structure, the activated carbon adsorption method it employs is essentially a unidirectional and static adsorption process. In actual operation, particulate matter in the waste gas continuously accumulates and enriches on the windward side of the activated carbon filter plate.

[0003] This work mode has the following significant drawbacks: 1. Easily clogged and with short effective working time: As the operating time accumulates, particulate matter forms a dense covering layer on one side of the filter plate, which not only greatly increases airflow resistance, but also clogs the pores on the surface of activated carbon, preventing the adsorption sites inside from effectively contacting the exhaust gas, resulting in a rapid decline in adsorption efficiency.

[0004] 2. High maintenance costs and cumbersome operation: When activated carbon filter plates fail due to clogging or adsorption saturation, existing cleaning methods usually require disassembling the entire filter plate from the equipment for manual cleaning or direct replacement. This process is time-consuming and labor-intensive, and frequent replacements result in high consumable costs and waste disposal costs. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a VOC exhaust gas pretreatment device that can effectively clean impurities adhering to the surface of the filter plate online without disassembling it. It is easy to operate and has low maintenance costs.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a VOC exhaust gas pretreatment device, comprising a filter box, an inlet pipe and an outlet pipe respectively disposed at both ends of the filter box, and a filter plate disposed inside the filter box. The filter box is equipped with a cleaning unit, which includes an adsorption hood. The adsorption hood is raised and lowered on the side of the filter plate facing the air inlet pipe to adsorb and clean the impurities adhering to the filter plate.

[0007] In the above scheme, preferably, the adsorption hood is provided with a plurality of adsorption ports, and the adsorption ports are connected to the dust collection equipment through adsorption tubes.

[0008] In the above scheme, preferably, the inner walls on both sides of the filter box are provided with guide grooves that cooperate with the guide of the adsorption hood, and the adsorption hood is provided with guide surfaces on both sides that are adapted to the guide groove on one side.

[0009] In the above scheme, preferably, several ball bearings that slide in contact with the bottom of the guide groove are symmetrically arranged on both sides of the adsorption cover.

[0010] In the above scheme, preferably, the filter box is equipped with a drive motor for driving the cleaning unit to lift and lower, the drive motor is equipped with a winding wheel, and the adsorption cover is equipped with a lifting rope connected to the winding wheel.

[0011] In the above scheme, preferably, the lifting ropes are symmetrically arranged on both sides of the adsorption cover, and the winding wheel is respectively provided with a first winding groove and a second winding groove connected to the lifting ropes on both sides.

[0012] In the above scheme, preferably, the adsorption cover is provided with a counterweight.

[0013] In the above scheme, preferably, the counterweight block is provided with a plurality of vibration motors on the side facing the filter plate, and the counterweight block is provided with a mounting cavity adapted to the vibration motors, and the vibration motors are elastically mounted in the mounting cavity through elastic elements.

[0014] In the above scheme, preferably, the filter box is provided with an induction switch electrically connected to the vibration motor, and the winding wheel is provided with an induction pin that, when rotated, cooperates with the induction switch and triggers it.

[0015] In the above scheme, preferably, wind speed detectors are respectively installed on the inlet and outlet of the air inlet pipe, and the wind speed detectors are connected to the PLC controller to determine the wind speed difference between the air inlet pipe and the air outlet pipe. The drive motor, vibration motor, and inductive switch are all connected to the PLC controller.

[0016] The beneficial effects of this utility model are as follows: By setting an adsorption hood that can rise and fall along the surface of the filter plate, and in conjunction with an external dust collection device, this utility model achieves online and efficient cleaning of impurities on the windward side of the filter plate without stopping the machine for disassembly, significantly extending the service life of the filter plate and reducing maintenance costs; at the same time, the vibration motor integrated in the device can generate high-frequency micro-vibration during the cleaning process, effectively loosening stubborn particles and making the cleaning more thorough; through the guide groove, ball bearings and symmetrically arranged lifting rope structure, the stability and reliability of the adsorption hood operation are ensured; in addition, by combining a wind speed detector and a PLC controller, automatic judgment and intelligent start and stop based on pressure difference changes are realized, making the entire cleaning process automated and intelligent, greatly reducing manual intervention. Attached Figure Description

[0017] Figure 1This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the adsorption cover of this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the cleaning unit of this utility model.

[0021] Figure 5 This utility model Figure 2 A magnified schematic diagram of the structure at point A in the middle. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figures 1-5 .

[0023] A VOC exhaust gas pretreatment device mainly includes a filter box 1, an inlet pipe 2, an outlet pipe 3, a filter plate 4, and a cleaning unit 5.

[0024] The filter box 1 is a sealed box with an air inlet pipe 2 and an air outlet pipe 3 connected to its left and right ends, respectively. The filter plate 4 is vertically fixed inside the filter box 1, preferably an activated carbon filter plate, for adsorbing particulate matter in VOC waste gas. Vertical guide grooves 101 are provided on the inner walls of both sides of the filter box 1.

[0025] The cleaning unit 5 includes an adsorption hood 501, which is disposed on the side of the filter plate 4 facing the air inlet pipe 2 (i.e., the windward side). The opening of the adsorption hood 501 is opposite to the surface of the filter plate 4, and its lateral width and shape are adapted to the lateral width of the filter plate 4. Figure 3 As shown.

[0026] The adsorption cover 501 has guide surfaces 504 on both sides, which cooperate with the guide groove 101 on the inner wall of the filter box 1, so that the adsorption cover 501 can be stably guided up and down along the guide groove 101. In order to reduce friction, a number of balls 505 are also symmetrically installed on both sides of the adsorption cover 501. These balls 505 slide in contact with the bottom of the guide groove 101, and the balls 505 can be connected to the side wall of the adsorption cover 501 by magnetic attraction or elastic connection, thereby setting a certain clearance redundancy for the vertical sliding up and down of the adsorption cover 501.

[0027] The internal cavity of the adsorption hood 501 is opposite to the surface of the filter plate 4 through multiple evenly distributed adsorption ports 502. These adsorption ports 502 are finally connected to an external industrial vacuum cleaner (not shown in the figure) through an adsorption tube 503. The adsorption tube 503 is connected to the industrial vacuum cleaner through a flexible tube, so that the adsorption hood 501 can achieve the effect of synchronous dust collection by the redundant expansion and contraction of the flexible tube when it is vertically raised and lowered.

[0028] To drive the lifting and lowering of the adsorption hood 501, a drive motor 6 is installed on the top of the filter box 1. The drive motor 6 is preferably a servo motor. A winding wheel 601 is fixed to the output shaft of the drive motor 6. A first winding groove 602 and a second winding groove 603 are arranged side-by-side on the winding wheel 601. One end of each of the two lifting ropes 506 is fixed to the first winding groove 602 and the second winding groove 603, respectively, and the other ends are symmetrically connected to the top sides of the adsorption hood 501. By controlling the forward and reverse rotation of the drive motor 6 to raise and lower the winding wheel 601 and the lifting ropes 506, the lifting and lowering of the adsorption hood 501 can be achieved. To balance and stabilize the lifting and lowering process of the adsorption hood 501, a counterweight 507 is also fixedly installed on the bottom end face of the adsorption hood 501. This allows the adsorption hood 501 to descend due to the gravity of the counterweight 507 when the lifting ropes 506 are released. Figure 4 and Figure 5 As shown.

[0029] To enhance the cleaning effect, several vibration motors 7 are embedded in the side of the counterweight 507 facing the filter plate 4. The vibration motors 7 are evenly arranged in a transverse array along the adsorption cover 501, such as... Figure 4 As shown, the counterweight 507 has a mounting cavity 508 that matches the shape of the vibrating motor 7. The vibrating motor 7 is elastically mounted in the mounting cavity 508 by springs or other elastic elements. This elastic mounting method can play a buffering role, avoiding the direct rigid transmission of vibration to the filter plate 4 and thus preventing damage to the rigidity of the filter plate 4. That is, while the adsorption cover 501 slides down to adsorb impurities on the filter plate 4, the vibrating motor 7 can be started to make the vibrating motor 7 synchronously contact the filter plate 4 and transmit vibration to the filter plate 4, causing the stubborn impurities adhering to it to fall off and be simultaneously adsorbed by the adsorption cover 501.

[0030] To achieve automatic control, an induction switch 701 is installed on the top of the filter box 1, and an induction pin 702 is provided on the winding wheel 601. When the winding wheel 601 rotates one revolution, the induction switch 701 is triggered once through the induction pin 702. After the induction switch 701 is triggered, each vibration motor 7 vibrates for N seconds, so that the vibration motor 7 can achieve intermittent vibration while the adsorption cover 501 is lifting and lowering.

[0031] In addition, wind speed detectors (not shown in the figure) are installed at the inlets of the air inlet pipe 2 and the air outlet pipe 3, respectively. All electrical components, including the drive motor 6, the vibration motor 7, the induction switch 701, and the wind speed detectors, are electrically connected to a PLC controller (not shown in the figure). When the wind speed detector between the air inlet pipe 2 and the air outlet pipe 3 detects a rapid increase in the wind speed difference, it means that there are too many impurities on the surface of the surface filter plate 4 and it needs to be cleaned. At this time, the drive motor 6 can be started by the PLC controller to make the adsorption cover 501 descend and remove the impurities from the surface of the filter plate 4, thereby cleaning the surface of the filter plate 4 and facilitating reuse.

[0032] Working principle: Under normal operating conditions, VOC exhaust gas enters through the inlet pipe 2, is purified by the filter plate 4, and is discharged through the outlet pipe 3; at this time, the cleaning unit 5 does not work.

[0033] When impurities accumulate on the surface of filter plate 4, causing an increase in the pressure difference across it (manifested as an increase in the wind speed difference between the air inlet pipe 2 and the air outlet pipe 3), the PLC controller receives a signal from the wind speed detector and determines that cleaning is required. The PLC controller then starts the drive motor 6 and the external vacuum cleaner. The drive motor 6 drives the winding wheel 601 to rotate, and the lifting rope 506 pulls the adsorption cover 501 to slowly descend (or ascend) along the surface of filter plate 4. During this process, the external vacuum cleaner continuously sucks away the impurities swept from the surface of filter plate 4 through the adsorption pipe 503 and the adsorption port 502.

[0034] When the winding wheel 601 rotates once, the sensing pin 702 triggers the sensing switch 701 once. After the sensing switch 701 is triggered, each vibration motor 7 vibrates for N seconds, so that the vibration motor 7 can vibrate intermittently while the adsorption cover 501 is rising and falling. The vibration generated by the vibration motor 7 is transmitted to the filter plate 4 through the counterweight 507 and the adsorption cover 501, which loosens the stubborn particles deep in its pores and then sucks them away by the adsorption cover 501, thus completing a deep cleaning.

[0035] After cleaning, all equipment was reset and the system resumed normal filtration operation.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A VOC waste gas pretreatment device, characterized in that: It includes a filter box (1), an air inlet pipe (2) and an air outlet pipe (3) respectively located at both ends of the filter box (1), and a filter plate (4) located inside the filter box (1). The filter box (1) is provided with a cleaning unit (5), which includes an adsorption hood (501). The adsorption hood (501) is raised and lowered on the side end face of the filter plate (4) facing the air inlet pipe (2) to achieve adsorption and cleaning of impurities adhering to the filter plate (4).

2. The VOC waste gas pretreatment device according to claim 1, characterized in that: The adsorption hood (501) is provided with a number of adsorption ports (502), and the adsorption ports (502) are connected to the dust collection equipment through adsorption tubes (503).

3. The VOC waste gas pretreatment device according to claim 1, characterized in that: The filter box (1) has guide grooves (101) on both sides of its inner wall that are compatible with the adsorption cover (501). The adsorption cover (501) has guide surfaces (504) on both sides that are compatible with the guide groove (101) on one side.

4. The VOC waste gas pretreatment device according to claim 3, characterized in that: The adsorption cover (501) has several balls (505) symmetrically arranged on both sides, which slide in contact with the bottom of the guide groove (101).

5. A VOC waste gas pretreatment device according to claim 1, characterized in that: The filter box (1) is equipped with a drive motor (6) for driving the cleaning unit (5) to lift and lower. The drive motor (6) is equipped with a winding wheel (601). The adsorption cover (501) is equipped with a lifting rope (506) connected to the winding wheel (601).

6. A VOC waste gas pretreatment device according to claim 5, characterized in that: The lifting ropes (506) are symmetrically arranged on both sides of the adsorption cover (501), and the winding wheel (601) is provided with a first winding groove (602) and a second winding groove (603) that are connected to the lifting ropes (506) on both sides.

7. A VOC waste gas pretreatment device according to claim 5, characterized in that: The adsorption cover (501) is provided with a counterweight (507).

8. A VOC waste gas pretreatment device according to claim 7, characterized in that: The counterweight (507) is provided with a plurality of vibration motors (7) on the side facing the filter plate (4). The counterweight (507) is provided with a mounting cavity (508) adapted to the vibration motor (7). The vibration motor (7) is elastically disposed in the mounting cavity (508) by means of an elastic element.

9. A VOC waste gas pretreatment device according to claim 8, characterized in that: The filter box (1) is provided with an induction switch (701) electrically connected to the vibration motor (7), and the winding wheel (601) is provided with an induction pin (702) that, after rotation, cooperates with the induction switch (701) and triggers it.

10. A VOC waste gas pretreatment device according to claim 1, characterized in that: Wind speed detectors are respectively installed on the inlet of the air inlet pipe (2) and the outlet pipe (3). The wind speed detectors are connected to the PLC controller to determine the wind speed difference between the air inlet pipe (2) and the outlet pipe (3). The drive motor (6), the vibration motor (7), and the induction switch (701) are all connected to the PLC controller.

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