VOC (volatile organic compound) treatment system

Abstract

The utility model discloses a VOC (volatile organic compound) treatment system, which relates to the technical field of waste gas treatment and comprises a primary filter, a first-stage spraying absorption tower, a second-stage spraying absorption tower, a third-stage spraying absorption tower, a water mist separation device, a first-stage activated carbon adsorption device, a second-stage activated carbon adsorption device, an exhaust fan and an exhaust funnel which are sequentially connected. The primary filter comprises a first shell and a filtering assembly, the filtering assembly comprises a filtering cotton layer and a first supporting plate, and a non-woven fabric bag type filtering piece is arranged on a first ventilation opening in the first supporting plate; the water mist separation device comprises a second shell, a silk screen and a plurality of centrifugal fans are arranged in the second shell, a second air inlet and a second air outlet are formed in the second shell, a water pan is arranged at the bottom of the second shell, and a water outlet is formed in the water pan; a flow guide groove used for guiding fog drops on the inner wall of the second shell to the water receiving disc is formed in the inner wall of the second shell. The treatment efficiency of the VOC is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a VOC treatment system. Background Art

[0002] VOC refers to a class of active volatile organic compounds, that is, the type of volatile organic compounds that can cause harm. When VOC reaches a certain concentration, people will feel headaches, nausea, vomiting, fatigue, etc. within a short period of time. In severe cases, convulsions and coma may occur, and it will damage the liver, kidneys, brain and nervous system, causing serious consequences such as memory loss.

[0003] Existing VOC treatment systems have the following disadvantages:

[0004] (1) The nozzles in the spray tower are easily clogged during the treatment process, affecting the spraying effect;

[0005] (2) The water mist separation effect in the water mist separation device is not good, resulting in the inability to use the activated carbon adsorption normally.

[0006] Due to the above reasons, the treatment efficiency of the existing VOC treatment system is low. Utility Model Content

[0007] The purpose of the utility model is to provide a VOC treatment system to solve the problems existing in the above-mentioned prior art and improve the VOC treatment efficiency.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] The utility model provides a VOC treatment system, comprising a primary filter, a primary spray absorption tower, a secondary spray absorption tower, a tertiary spray absorption tower, a water mist separation device, a primary activated carbon adsorption device, a secondary activated carbon adsorption device, an exhaust fan and an exhaust pipe connected in sequence;

[0010] The primary filter comprises a first shell and a filter assembly arranged in the first shell, the first shell is provided with a first air inlet and a first air outlet, the first air inlet is used to let in exhaust gas, and the first air outlet is connected to the air inlet of the first-stage spray absorption tower; the filter assembly comprises a filter cotton layer and a first support plate respectively sealed and connected to the inner wall of the first shell, the filter cotton layer is closer to the first air inlet than the first support plate, a plurality of first air vents are arranged on the first support plate, and each of the first air vents is provided with a non-woven bag filter;

[0011] The water mist separation device includes a second shell, a wire mesh and a plurality of centrifugal fans are arranged in the second shell, a second air inlet and a second air outlet are arranged on the second shell, the second air inlet is connected with the air outlet of the three-stage spray absorption tower, and the second air outlet is connected with the air inlet of the first-stage activated carbon adsorption device; a water receiving tray is arranged at the bottom of the second shell, the wire mesh and the centrifugal fans are both located above the water receiving tray, and a drain outlet is arranged on the water receiving tray; the air inlet end of the centrifugal fan is facing the side of the wire mesh away from the second air inlet, and the exhaust end faces the second air outlet, and the inner wall of the second shell is provided with a guide groove for guiding the droplets on the inner wall of the second shell to the water receiving tray.

[0012] Preferably, the filter cotton layer is closer to the first air inlet than the non-woven bag filter element.

[0013] Preferably, the first-stage spray absorption tower, the second-stage spray absorption tower and the third-stage spray absorption tower all include a tower body and a circulating water tank, the bottom of the tower body is provided with a fourth air inlet and a water outlet from top to bottom, the top of the tower body is provided with a demisting layer and a plurality of packing layers distributed in sequence from top to bottom, and the packing layer is located below the demisting layer, a spray unit is provided on the top of each packing layer, the spray unit corresponds to the packing layer one by one, each spray unit includes a plurality of nozzles, the nozzles are connected with the circulating water tank through pipelines, the spray unit is used to spray the corresponding packing layer, and the top of the tower body is provided with a fourth air outlet.

[0014] Preferably, the primary activated carbon adsorption device and the secondary activated carbon adsorption device both include an adsorption box and three activated carbon adsorption layers arranged in the adsorption box, the adsorption box is provided with a third air inlet and a third air outlet, the direction from the third air inlet to the third air outlet is a first direction, all the activated carbon adsorption layers are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

[0015] Preferably, the three activated carbon adsorption layers are respectively a first activated carbon adsorption layer, a second activated carbon adsorption layer and a third activated carbon adsorption layer, and the second activated carbon adsorption layer is located between the first activated carbon adsorption layer and the third activated carbon adsorption layer;

[0016] The gap between the first activated carbon adsorption layer and the inner wall of the adsorption box is blocked by a first partition at one end near the third air outlet, the gap between the first activated carbon adsorption layer and the second activated carbon adsorption layer is blocked by a second partition at one end near the third air inlet, the gap between the second activated carbon adsorption layer and the third activated carbon adsorption layer is blocked by a third partition at one end near the third air outlet, and the gap between the third activated carbon adsorption layer and the inner wall of the adsorption box is blocked by a fourth partition at one end near the third air inlet.

[0017] Preferably, the primary filter, the first-level activated carbon adsorption device and the second-level activated carbon adsorption device are respectively provided with differential pressure gauges, each of which is connected to a controller, and the controller can activate an alarm device when the monitoring value of the differential pressure gauge reaches a set value. The alarm device adopts a buzzer or an alarm light, and the alarm device corresponds to the differential pressure gauge one by one; the differential pressure gauge on the primary filter is used to monitor the pressure difference between the first air inlet and the first air outlet, the differential pressure gauge on the first-level activated carbon adsorption device is used to monitor the pressure difference between the air inlet and the air outlet of the first-level activated carbon adsorption device, and the differential pressure gauge on the second-level activated carbon adsorption device is used to monitor the pressure difference between the air inlet and the air outlet of the second-level activated carbon adsorption device.

[0018] Preferably, each of the activated carbon adsorption layers comprises a mesh box and activated carbon arranged in the mesh box, a top end of the mesh box is provided with a plurality of filling ports, and a bottom end of the mesh box is provided with a plurality of discharge ports.

[0019] Compared with the prior art, the utility model has achieved the following technical effects:

[0020] The VOC treatment system of the utility model can intercept particulate dust in the exhaust gas and remove particulate matter in the exhaust gas through the setting of a preliminary filter, thereby solving the problem that the nozzle in the spray absorption tower is easily blocked due to the presence of particulate matter, and improving the treatment efficiency of the exhaust gas; the water mist separation device uses a wire mesh to perform static demisting and uses a centrifugal fan to remove water mist in the exhaust gas, which greatly reduces the water content in the exhaust gas after spraying, reduces the water vapor entering the activated carbon adsorption device, improves the adsorption effect of the activated carbon on the exhaust gas, and improves the treatment efficiency of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a structural diagram of the VOC treatment system of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the primary filter in the VOC treatment system of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the first-level spray absorption tower in the VOC treatment system of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the water mist separation device in the VOC treatment system of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the primary activated carbon adsorption device in the VOC treatment system of the utility model;

[0027] Among them, 10, primary filter; 20, primary spray absorption tower; 30, secondary spray absorption tower; 40, tertiary spray absorption tower; 50, water mist separation device; 60, primary activated carbon adsorption device; 70, secondary activated carbon adsorption device; 80, exhaust fan; 90, exhaust pipe;

[0028] 101, first air inlet; 102, filter cotton layer; 103, first support plate; 104, non-woven bag filter element; 105, first air outlet; 106, first shell;

[0029] 201, tower body; 202, packing layer; 203, circulating water tank; 204, spray water; 205, fourth air inlet; 206, water outlet; 207, fourth air outlet; 208, demisting layer;

[0030] 501, second air inlet; 502, second air outlet; 503, second shell; 504, wire mesh; 505, centrifugal fan; 506, water tray; 507, drain outlet;

[0031] 601, adsorption box; 602, third air inlet; 603, third air outlet; 604, first activated carbon adsorption layer; 605, second activated carbon adsorption layer; 606, third activated carbon adsorption layer; 607, first partition; 608, second partition; 609, third partition; 610, fourth partition. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The purpose of the utility model is to provide a VOC treatment system to solve the problems existing in the above-mentioned prior art and improve the VOC treatment efficiency.

[0034] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] like Figures 1 to 5 As shown, this embodiment provides a VOC treatment system, including a primary filter 10, a primary spray absorption tower 20, a secondary spray absorption tower 30, a tertiary spray absorption tower 40, a water mist separation device 50, a primary activated carbon adsorption device 60, a secondary activated carbon adsorption device 70, an exhaust fan 80 and an exhaust chimney 90 connected in sequence.

[0036] The primary filter 10 includes a first shell 106 and a filter assembly arranged in the first shell 106. The first shell 106 is provided with a first air inlet 101 and a first air outlet 105. The first air inlet 101 is used to introduce exhaust gas, and the first air outlet 105 is connected to the air inlet of the first-level spray absorption tower 20; the filter assembly includes a filter cotton layer 102 and a first support plate 103 respectively sealed to the inner wall of the first shell 106, the filter cotton layer 102 is closer to the first air inlet 101 than the first support plate 103, and a plurality of first air vents are provided on the first support plate 103, and each first air vent is provided with a non-woven bag filter element 104.

[0037] It should be noted that the filter cotton layer 102 is spaced apart from the first support plate 103, and the bag opening of the non-woven bag filter 104 is sealed and connected to the corresponding first vent; the exhaust gas will first pass through the primary filter 10, and the dusty exhaust gas will enter the first shell 106 through the exhaust gas collection and delivery pipeline and the first air inlet 101. The dusty exhaust gas is filtered by the filter cotton layer 102 and the non-woven bag filter 104 in the filter assembly in the first shell 106, and the dust in the exhaust gas can be intercepted in the box. The gas passes through the primary filter 10 and enters the subsequent treatment system. The dust particles in the exhaust gas are removed by regularly cleaning or replacing the primary filter 10. The primary filter 10 can be used to intercept particulate dust in the exhaust gas, has a large dust holding capacity, and mainly filters dust particles above 1μm. It has the characteristics of low resistance and large air volume; the primary filter 10 can be cleaned and reused many times, and has a long service life. The VOC treatment system of the utility model can intercept particulate dust in the exhaust gas through the setting of the preliminary filter, remove the particulate matter in the exhaust gas, thereby solving the problem that the nozzle in the spray absorption tower is easily blocked due to the presence of particulate matter, and improving the exhaust gas treatment efficiency. The non-woven bag filter 104 is a prior art, and the specific structure of the non-woven bag filter 104 is not elaborated in this embodiment.

[0038] The water mist separation device 50 includes a second shell 503, in which a wire mesh 504 and a plurality of centrifugal fans 505 are arranged, and a second air inlet 501 and a second air outlet 502 are arranged on the second shell 503, the second air inlet 501 is connected to the air outlet of the third-stage spray absorption tower 40, and the second air outlet 502 is connected to the air inlet of the first-stage activated carbon adsorption device 60; a water receiving tray 506 is arranged at the bottom of the second shell 503, the wire mesh 504 and the centrifugal fan 505 are both located above the water receiving tray 506, and a drain outlet 507 is arranged on the water receiving tray 506; the air inlet end of the centrifugal fan 505 is directly opposite to the side of the wire mesh 504 away from the second air inlet 501, and the exhaust end faces the second air outlet 502, and the inner wall of the second shell 503 is provided with a guide groove for guiding the droplets on the inner wall of the second shell 503 to the water receiving tray 506.

[0039] The exhaust gas filtered by the preliminary filter will be sprayed and washed in the first-stage spray absorption tower 20, the second-stage spray absorption tower 30 and the third-stage spray absorption tower 40 in turn, and then enter the second shell 503 of the water mist separation device 50 through the second air inlet 501. The exhaust gas first passes through the wire mesh 504 to remove larger particle droplets. The wire mesh 504 is made of stainless steel. The principle of defogger of the wire mesh 504 is that when the fine droplets in the gas phase pass through the stainless steel wire mesh 504, the droplets hit the wire mesh 504 and adsorb on the wire mesh 504. When the number of droplets adsorbed on the wire mesh 504 increases, the tiny droplets gather and condense into large droplets. Under the action of gravity, the droplets move downward along the intersection of the woven wire mesh 504, continuously adsorbing the droplets in the gas together, and the grown droplets flow to the bottom of the wire mesh 504, and finally fall into the water receiving tray 506 below the wire mesh 504.

[0040] The exhaust gas after passing through the wire mesh 504 flows toward the centrifugal fan 505, and the centrifugal fan 505 causes the exhaust gas after passing through the wire mesh 504 to perform centrifugal motion. When the exhaust gas performs centrifugal motion, the water mist remaining in the exhaust gas will be thrown toward the inner wall of the second shell 503 due to the relatively large centrifugal force. In the process of the droplets continuously hitting the inner wall of the second shell 503, the volume of the droplets on the inner wall of the second shell 503 continues to increase. When the volume of the droplets on the inner wall of the second shell 503 increases to a certain extent, it will flow along the guide groove to the water receiving tray 506, and finally be discharged through the drain outlet 507.

[0041] In the water mist separation device 50, static demisting is performed through the wire mesh 504 and the water mist in the exhaust gas is removed through the centrifugal fan 505, which greatly reduces the water content in the exhaust gas after spraying, reduces the water vapor entering the activated carbon adsorption device, improves the adsorption effect of the activated carbon on the exhaust gas, and improves the exhaust gas treatment efficiency.

[0042] It should be noted that the first-stage spray absorption tower 20, the second-stage spray absorption tower 30 and the third-stage spray absorption tower 40 can all adopt existing spray absorption towers in the field, and the first-stage activated carbon adsorption device 60 and the second-stage activated carbon adsorption device 70 can all adopt existing activated carbon adsorption devices in the field; the exhaust fan 80 is used to pump the waste gas adsorbed by the second-stage activated carbon adsorption device 70 to the exhaust pipe 90, and discharge it through the exhaust pipe 90.

[0043] In the optional scheme of this embodiment, it is more preferred that the filter cotton layer 102 is closer to the first air inlet 101 than the non-woven bag filter element 104. That is, when the exhaust gas enters the preliminary filter, the exhaust gas is first filtered by the filter cotton in the filter cotton layer 102, and then filtered by the non-woven bag filter element 104. The filter cotton removes particles with a particle size of 5 μm or more, and the non-woven bag filter element 104 removes particles with a particle size of 1-5 μm.

[0044] In the optional scheme of the present embodiment, it is more preferred that the first-stage spray absorption tower 20, the second-stage spray absorption tower 30 and the third-stage spray absorption tower 40 all include a tower body 201 and a circulating water tank 203, the bottom of the tower body 201 is provided with a fourth air inlet 205 and a water outlet 206 from top to bottom, the top of the tower body 201 is provided with a demisting layer 208 and a plurality of packing layers 202 distributed from top to bottom, and the packing layer 202 is located below the demisting layer 208, a spray unit is provided at the top of each packing layer 202, the spray unit corresponds to the packing layer 202 one by one, each spray unit includes a plurality of nozzles, the nozzle is connected to the circulating water tank 203 through a pipeline, the spray unit is used to spray the corresponding packing layer 202, the top of the tower body 201 is provided with a fourth air outlet 207, and the topmost spray unit is located below the demisting layer 208. The exhaust gas enters the tower from the air inlet at the bottom of the tower body 201, and passes through the tower body 201 from bottom to top, while the spray water 204 sprays down from top to bottom, that is, the gas and liquid flow in opposite directions, and the gas continuously passes through the packing layer 202 when flowing through the packing layer 202, and the gas and liquid are in close contact on the surface of the packing for mass transfer; when the spray water 204 reaches the bottom of the tower body 201, it flows into the circulating water tank 203 and is pumped to the nozzle for spraying. When the concentration of the spray water 204 reaches the set value, the water outlet 206 at the bottom of the tower body 201 is opened to discharge the water in the circulating water tank 203 and the bottom of the tower body 201. After the water is discharged, the water outlet 206 is closed, and the circulating water tank 203 is replenished with water to facilitate the next cycle of spraying. The demisting layer 208 is a prior art, and the specific structure of the demisting layer 208 is not elaborated in this embodiment. After being sprayed in the tower body 201 , the exhaust gas flows into the primary activated carbon adsorption device 60 and the secondary activated carbon adsorption device 70 through the fourth gas outlet 207 , and is finally discharged through the exhaust pipe 90 by being pumped by the exhaust fan 80 .

[0045] The tower body 201 in this embodiment is a packed tower, which belongs to a continuous contact gas-liquid mass transfer device. The two-phase composition changes continuously along the tower height. Under normal operating conditions, the gas phase is the continuous phase and the liquid phase is the dispersed phase. The liquid absorption tower is provided with manholes at different locations for easy maintenance and overhaul. An observation hole is provided on the side of the tower body 201, through which the changes and reaction processes of the liquid and gas in the tower body 201 can be observed. The packed tower has the advantages of large production capacity, high separation efficiency, small pressure drop, small liquid holdup, and large operational flexibility.

[0046] In the optional scheme of the present embodiment, it is more preferred that the first-stage activated carbon adsorption device 60 and the second-stage activated carbon adsorption device 70 both include an adsorption box 601 and three activated carbon adsorption layers arranged in the adsorption box 601, and the adsorption box 601 is provided with a third air inlet 602 and a third air outlet 603, and the direction from the third air inlet 602 to the third air outlet 603 is the first direction, and all the activated carbon adsorption layers are arranged at intervals along the second direction, and the second direction is perpendicular to the first direction.

[0047] In the optional scheme of this embodiment, it is more preferred that the three activated carbon adsorption layers are respectively the first activated carbon adsorption layer 604, the second activated carbon adsorption layer 605 and the third activated carbon adsorption layer 606, and the second activated carbon adsorption layer 605 is located between the first activated carbon adsorption layer 604 and the third activated carbon adsorption layer 606;

[0048] The gap between the first activated carbon adsorption layer 604 and the inner wall of the adsorption box 601 is blocked by the first partition plate 607 at one end near the third air outlet 603, the gap between the first activated carbon adsorption layer 604 and the second activated carbon adsorption layer 605 is blocked by the second partition plate 608 at one end near the third air inlet 602, the gap between the second activated carbon adsorption layer 605 and the third activated carbon adsorption layer 606 is blocked by the third partition plate 609 at one end near the third air outlet 603, and the gap between the third activated carbon adsorption layer 606 and the inner wall of the adsorption box 601 is blocked by the fourth partition plate 610 at one end near the third air inlet 602.

[0049] In this embodiment, the flow path of the exhaust gas in the adsorption box 601 is limited by the provision of the first baffle 607, the second baffle 608, the third baffle 609 and the fourth baffle 610, thereby reducing the resistance to air circulation as much as possible while improving the adsorption effect.

[0050] In the optional scheme of the present embodiment, it is more preferred that a differential pressure gauge is respectively provided on the primary filter 10, the first-level activated carbon adsorption device 60 and the second-level activated carbon adsorption device 70, each differential pressure gauge is connected to the controller, and the controller can turn on the alarm device when the monitoring value of the differential pressure gauge reaches the set value. The alarm device adopts a buzzer or an alarm light, and the alarm device corresponds to the differential pressure gauge one by one; the differential pressure gauge on the primary filter 10 is used to monitor the pressure difference between the first air inlet and the first air outlet, the differential pressure gauge on the first-level activated carbon adsorption device 60 is used to monitor the pressure difference between the air inlet and the air outlet of the first-level activated carbon adsorption device 60, and the differential pressure gauge on the second-level activated carbon adsorption device 70 is used to monitor the pressure difference between the air inlet and the air outlet of the second-level activated carbon adsorption device 70. The pressure difference is detected by a differential pressure gauge, and the controller controls the alarm device to sound an alarm when the pressure difference value detected by the differential pressure gauge exceeds the set value. Since the alarm device corresponds to the differential pressure gauge one by one, by knowing which alarm device sounds an alarm, it is possible to determine which of the primary filter 10, the first-level activated carbon adsorption device 60 and the second-level activated carbon adsorption device 70 has a too low pressure difference, and the user can be reminded to replace the filter component or activated carbon in time, which is convenient to use.

[0051] In the optional scheme of this embodiment, it is more preferred that each activated carbon adsorption layer includes a mesh box and activated carbon arranged in the mesh box, a plurality of filling ports are arranged at the top of the mesh box, a plurality of unloading ports are arranged at the bottom of the mesh box, and a gate is arranged at the unloading port. Unloading can be carried out by opening the gate at the unloading port when unloading is required.

[0052] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A VOC treatment system, characterized in that: It includes a primary filter, a primary spray absorption tower, a secondary spray absorption tower, a tertiary spray absorption tower, a water mist separation device, a primary activated carbon adsorption device, a secondary activated carbon adsorption device, an exhaust fan and an exhaust pipe which are connected in sequence; The primary filter comprises a first shell and a filter assembly arranged in the first shell, the first shell is provided with a first air inlet and a first air outlet, the first air inlet is used to let in exhaust gas, and the first air outlet is connected to the air inlet of the first-stage spray absorption tower; the filter assembly comprises a filter cotton layer and a first support plate respectively sealed and connected to the inner wall of the first shell, the filter cotton layer is closer to the first air inlet than the first support plate, a plurality of first air vents are arranged on the first support plate, and each of the first air vents is provided with a non-woven bag filter; The water mist separation device includes a second shell, a wire mesh and a plurality of centrifugal fans are arranged in the second shell, a second air inlet and a second air outlet are arranged on the second shell, the second air inlet is connected with the air outlet of the three-stage spray absorption tower, and the second air outlet is connected with the air inlet of the first-stage activated carbon adsorption device; a water receiving tray is arranged at the bottom of the second shell, the wire mesh and the centrifugal fans are both located above the water receiving tray, and a drain outlet is arranged on the water receiving tray; the air inlet end of the centrifugal fan is facing the side of the wire mesh away from the second air inlet, and the exhaust end faces the second air outlet, and the inner wall of the second shell is provided with a guide groove for guiding the droplets on the inner wall of the second shell to the water receiving tray.

2. The VOC treatment system according to claim 1, characterized in that: The filter cotton layer is closer to the first air inlet than the non-woven bag filter element.

3. The VOC treatment system according to claim 1, characterized in that: The first-stage spray absorption tower, the second-stage spray absorption tower and the third-stage spray absorption tower all include a tower body and a circulating water tank. The bottom of the tower body is provided with a fourth air inlet and a water outlet from top to bottom. The top of the tower body is provided with a demisting layer and a plurality of packing layers distributed in sequence from top to bottom, and the packing layer is located below the demisting layer. A spray unit is provided on the top of each packing layer. The spray unit corresponds to the packing layer one by one. Each spray unit includes a plurality of nozzles. The nozzle is connected to the circulating water tank through a pipeline. The spray unit is used to spray the corresponding packing layer. The top of the tower body is provided with a fourth air outlet.

4. The VOC treatment system according to claim 1, characterized in that: The primary activated carbon adsorption device and the secondary activated carbon adsorption device both include an adsorption box and three activated carbon adsorption layers arranged in the adsorption box, the adsorption box is provided with a third air inlet and a third air outlet, the direction from the third air inlet to the third air outlet is a first direction, all the activated carbon adsorption layers are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction.

5. The VOC treatment system according to claim 4, characterized in that: The three activated carbon adsorption layers are respectively a first activated carbon adsorption layer, a second activated carbon adsorption layer and a third activated carbon adsorption layer, and the second activated carbon adsorption layer is located between the first activated carbon adsorption layer and the third activated carbon adsorption layer; The gap between the first activated carbon adsorption layer and the inner wall of the adsorption box is blocked by a first partition at one end near the third air outlet, the gap between the first activated carbon adsorption layer and the second activated carbon adsorption layer is blocked by a second partition at one end near the third air inlet, the gap between the second activated carbon adsorption layer and the third activated carbon adsorption layer is blocked by a third partition at one end near the third air outlet, and the gap between the third activated carbon adsorption layer and the inner wall of the adsorption box is blocked by a fourth partition at one end near the third air inlet.

6. The VOC treatment system according to claim 1, characterized in that: The primary filter, the first-level activated carbon adsorption device and the second-level activated carbon adsorption device are respectively provided with differential pressure gauges, each of which is connected to a controller, and the controller can activate an alarm device when the monitoring value of the differential pressure gauge reaches a set value. The alarm device adopts a buzzer or an alarm light, and the alarm device corresponds to the differential pressure gauge one by one; the differential pressure gauge on the primary filter is used to monitor the pressure difference between the first air inlet and the first air outlet, the differential pressure gauge on the first-level activated carbon adsorption device is used to monitor the pressure difference between the air inlet and the air outlet of the first-level activated carbon adsorption device, and the differential pressure gauge on the second-level activated carbon adsorption device is used to monitor the pressure difference between the air inlet and the air outlet of the second-level activated carbon adsorption device.

7. The VOC treatment system according to claim 4, characterized in that: Each of the activated carbon adsorption layers comprises a mesh box and activated carbon arranged in the mesh box. The top of the mesh box is provided with a plurality of filling ports, and the bottom of the mesh box is provided with a plurality of discharge ports.

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