A spraying device with exhaust gas treatment function

Abstract

The application discloses a spraying device with waste gas treatment function, comprising a spraying protection cabinet, a spraying tower and a gas extraction mechanism. The spraying tower is internally provided with a water removal layer, a filler layer, a spraying layer, a cyclone stirring layer and a liquid circulation layer from top to bottom. The gas extraction mechanism forms a negative pressure at the top of the tower, and the waste gas of the spraying protection cabinet is sucked into the cyclone stirring layer, so that the gas and liquid are fully mixed through spraying and cyclone stirring, the mixed gas is subjected to a reinforced reaction through the filler layer, and then water is removed through the water removal layer and discharged up to the standard. The device solves the problems of large occupation of traditional systems, easy blockage of pipelines and low efficiency, and has the advantages of high treatment efficiency, compact structure and low operation cost.

Description

Technical Field

[0001] This application relates to the technical field of spraying equipment, and more specifically, to a spraying equipment with exhaust gas treatment function. Background Technology

[0002] In industrial production, spraying is widely used in product surface treatment. Traditional spraying equipment generates a large amount of waste gas containing harmful substances such as paint mist and volatile organic compounds (VOCs) during operation. If this waste gas is discharged directly without treatment, it will cause serious pollution to the atmospheric environment and endanger the health of operators.

[0003] Currently, the most common method for treating spray painting exhaust gas is to set up an independent exhaust gas treatment system outside the spray booth, such as a single spray tower, activated carbon adsorption device, or catalytic combustion equipment. This separate design has obvious drawbacks: First, it occupies a large area, requiring additional space to install treatment facilities, increasing the complexity and cost of the factory layout; second, the exhaust gas needs to be transported through long pipelines from the spray booth to the treatment device, which is prone to blockage due to paint mist settling, and there is a risk of exhaust gas leakage, resulting in poor treatment efficiency and control effect; finally, the independently set spray towers are mostly simple single-stage or two-stage sprays, which have limited removal efficiency for fine paint mist particles and organic solvents, making it difficult to meet increasingly stringent environmental emission standards.

[0004] Therefore, the industry urgently needs an integrated device that highly integrates spraying and exhaust gas treatment, which can effectively solve the above problems, achieve efficient and compact exhaust gas treatment, and directly meet emission standards. Utility Model Content

[0005] To address the problems described in the background art, this application provides a spraying device with exhaust gas treatment function.

[0006] A spraying device with exhaust gas treatment function includes a spraying protective cabinet, a spray tower, and a gas extraction mechanism. The spray tower includes a tower body and a dewatering layer, a packing layer, a spraying layer, a cyclone stirring layer, and a liquid circulation layer arranged from top to bottom within the tower body. The spraying protective cabinet is connected to the tower body, and the side of the cyclone stirring layer is connected to the spraying protective cabinet. The bottom of the cyclone stirring layer is connected to the liquid circulation layer. The gas extraction mechanism is connected to the top of the tower body. A negative pressure is created by the gas extraction mechanism, causing the exhaust gas in the spraying protective cabinet to enter the cyclone stirring layer. Liquid is sprayed onto the cyclone stirring layer through the spraying layer, and the gas-liquid mixture is stirred and conveyed upward through the cyclone stirring layer. The gas-liquid mixture is further mixed through the packing layer, and moisture is removed in the dewatering layer.

[0007] Preferably, the dewatering layer is provided with a dewatering component, which is a cyclone plate or a wire mesh demister.

[0008] Preferably, the spray layer is provided with a straight pipeline, the straight pipeline extends in a straight line, and multiple nozzles are arranged along the extension direction of the straight pipeline, the nozzles spraying in a downward direction.

[0009] Preferably, the packing layer is filled with packing material, which is one or more combinations of Pall rings, Raschig rings, multifaceted hollow spheres, or stepped rings.

[0010] Preferably, the cyclone mixing layer is provided with multiple cyclone mixing tanks arranged in parallel and a connecting box located on one side thereon. The multiple cyclone mixing tanks are arranged in parallel along the extension direction of the straight pipeline. Each cyclone mixing tank has an exhaust gas inlet at the top, an open bottom extending to the liquid circulation layer below, and a clean gas outlet on the side. The clean gas outlets of all cyclone mixing tanks are connected to the connecting box, which is connected to the spray protection cabinet. The number of cyclone mixing tanks is the same as the number of nozzles provided on the straight pipeline, and each nozzle is aligned with one cyclone mixing tank and located above the exhaust gas inlet of that cyclone mixing tank.

[0011] Preferably, the liquid circulation layer includes a bottom water tank, and a trough with an open top is provided in the bottom water tank. The bottom ends of the plurality of cyclone mixing tanks are all submerged in the trough. A water outlet is provided on one side of the top of the trough, and an inclined water outlet guide plate is provided at the water outlet.

[0012] Preferably, the liquid circulation layer further includes a water tank located in the bottom pool, a filter screen is provided on one side of the water tank and is connected to the bottom pool through the filter screen, a water pump is provided on the top of the water tank, the input end of the water pump extends into the water tank, and the output end of the water pump is connected to a water delivery pipe, which is connected to and communicates with the straight pipeline.

[0013] Preferably, the gas extraction mechanism includes an air supply pipe connected to the top of the tower, an air volume pleated filter box connected to the air supply pipe, and a negative pressure fan connected to the air volume pleated filter box.

[0014] The beneficial technical effects of this application are as follows:

[0015] 1. By integrating the spray protection cabinet and spray tower into a single unit, the system effectively solves the problems of large footprint, easy pipe blockage, high risk of gas leakage, and low treatment efficiency associated with traditional separate waste gas treatment systems. Specifically, the equipment utilizes a gas extraction mechanism to create negative pressure, directly introducing the waste gas generated during spraying into the cyclone mixing layer, avoiding the risks of paint mist settling and leakage caused by long-distance pipeline transportation. Through the downward spraying of liquid from the spray layer and the gas-liquid mixing action of the cyclone mixing layer, the waste gas and treatment liquid are thoroughly mixed, significantly improving the removal efficiency of paint mist particles and volatile organic compounds. Subsequently, the gas-liquid mixture undergoes further enhanced contact and reaction in the packing layer, and moisture is effectively separated by the dehydration layer, ensuring that the outlet gas directly meets environmental emission standards. In addition, the liquid circulation layer enables the recycling of the treatment liquid, reducing operating costs, while the compact structural design reduces the equipment footprint and simplifies the plant layout, achieving overall high efficiency, reliability, and economy in waste gas treatment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a spraying device with exhaust gas treatment function according to this embodiment.

[0017] Figure 2 This is a schematic diagram of the spray tower in this embodiment.

[0018] Attached reference numerals: 1. Spraying protective cabinet; 2. Spray tower; 21. Tower body; 22. Dewatering layer; 23. Packing layer; 24. Spraying layer; 241. Straight pipeline; 242. Spray nozzle; 25. Cyclone mixing layer; 251. Cyclone mixing tank; 2511. Mixing fan; 252. Connecting box; 26. Liquid circulation layer; 261. Bottom pool; 262. Water tank; 263. Tank body; 264. Water outlet guide plate; 265. Water pump; 266. Water supply pipe; 3. Gas extraction mechanism; 31. Air supply pipe; 32. Air volume pleated filter box; 33. Negative pressure fan; Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Reference Figure 1 and Figure 2This application provides a spraying device with exhaust gas treatment function. In specific implementation, its core lies in the compact combination of the spraying protective cabinet 1 and the spray tower 2, which integrates a multi-stage purification unit. The spraying operation generates exhaust gas in the spraying protective cabinet 1. This exhaust gas is driven by a negative pressure formed at the top of the spray tower 2 by a gas extraction mechanism 3 and is directly drawn into the tower body 21 for treatment. The spray tower 2 includes a tower body 21 and a water removal layer 22, a packing layer 23, a spray layer 24, a cyclone stirring layer 25, and a liquid circulation layer 26 arranged from top to bottom in the tower body 21. The spraying protective cabinet 1 is connected to the tower body 21.

[0021] Reference Figure 1 and Figure 2 The exhaust gas first enters the cyclone mixing layer 25 located in the middle of the tower body 21. This layer consists of multiple cyclone mixing drums 251 arranged side by side and a shared connecting box 252. Each cyclone mixing drum 251 has an exhaust gas inlet at the top, an open bottom, and a clean gas outlet on the side. The clean gas outlets of all cyclone mixing drums 251 are connected to the connecting box 252, which in turn connects to the interior of the spray protection cabinet 1 through a side opening, forming the main channel for exhaust gas entry. A mixing fan 2511 is installed at the top of the cyclone mixing drum 251, with the outlet of the mixing fan 2511 facing upwards to achieve gas mixing.

[0022] Reference Figure 1 and Figure 2 Above the cyclone mixing layer 25, a spray layer 24 is provided. This spray layer 24 uses a straight pipe 241 extending in a straight line, with multiple downward-spraying nozzles 242 installed along its length. The number and arrangement of the nozzles 242 correspond one-to-one with the number and arrangement of the cyclone mixing tanks 251 below, ensuring that each nozzle 242 can accurately spray above the exhaust gas inlet of a cyclone mixing tank 251.

[0023] Reference Figure 1 and Figure 2 The liquid required for treatment is supplied by a liquid circulation layer 26. This layer is located at the bottom of the tower body 21 and includes a bottom pool 261 and a water tank 262, with the water tank 262 located within the bottom pool 261. The bottom pool 261 contains a trough 263 with an open top, and the bottom ends of multiple cyclone agitators 251 are submerged below the liquid surface of this trough 263, forming a liquid seal. An outlet is located on the upper side of one side of the trough 263, equipped with an inclined outlet guide plate 264. The water tank 262 is connected to the bottom pool 261 on one side via a filter screen 2621, and a water pump 265 is installed at the top. The water pump 265 draws liquid from the water tank 262 and pumps it through a water delivery pipe 266 to the straight pipe 241 of the upper spray layer 24.

[0024] Reference Figure 1 and Figure 2 During operation, water pump 265 delivers liquid to straight pipeline 241, which sprays it downwards through nozzle 242. Simultaneously, under negative pressure, exhaust gas enters tangentially from the exhaust gas inlet at the top of cyclone mixing tank 251, creating a rotating airflow within the tank. The downward-sprayed liquid and the upward-rotating exhaust gas are intensely mixed and agitated within the cyclone mixing tank 251, achieving initial capture of paint mist particles and dissolution of some organic matter. The purified gas-liquid mixture flows upwards, while the paint mist-containing liquid is thrown against the tank wall under centrifugal force, eventually falling back through the bottom opening into the tank 263 of the liquid circulation layer 26. The falling liquid is filtered through a filter screen and then enters the water tank 262 for recycling.

[0025] Reference Figure 1 and Figure 2 Subsequently, the gas-liquid mixture rises to the packing layer 23. This layer is filled with highly efficient packing materials such as Pall rings, Raschig rings, or multifaceted hollow spheres. The huge specific surface area allows the gas and liquid phases to come into full contact here, enabling deep purification and mass transfer, and further removing volatile organic compounds.

[0026] Reference Figure 1 and Figure 2 After being purified by the packing layer 23, the gas continues to rise to the top dehydration layer 22. This layer is equipped with dehydration components, such as cyclone separators or wire mesh demisters, which effectively intercept, collect, and separate the tiny droplets entrained in the gas, ensuring that the discharged gas is dry.

[0027] Reference Figure 1 and Figure 2 Finally, the thoroughly purified and dried gas is extracted by the gas extraction mechanism 3 at the top of the tower. This mechanism consists of a gas supply pipe 31 connected to the top of the tower, a pleated filter box 32 connected to the gas supply pipe 31, and a negative pressure fan 33 connected to the filter box. The gas undergoes final filtration before being discharged, and is then discharged in compliance with emission standards by the negative pressure fan 33.

[0028] This application integrates the waste gas treatment process seamlessly through a compact, integrated design, which not only saves space but also ensures efficient, stable, and economical treatment results through the multi-stage synergistic effect of cyclone mixing, spraying, packing adsorption, and water removal.

[0029] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spraying equipment with exhaust gas treatment function, characterized in that: The system includes a spray protection cabinet, a spray tower, and a gas extraction mechanism. The spray tower comprises a tower body and, arranged from top to bottom, a dewatering layer, a packing layer, a spraying layer, a cyclone mixing layer, and a liquid circulation layer. The spray protection cabinet is connected to the tower body, and the side of the cyclone mixing layer is connected to the spray protection cabinet. The bottom of the cyclone mixing layer is connected to the liquid circulation layer. The gas extraction mechanism is connected to the top of the tower body. The gas extraction mechanism creates a negative pressure, causing the exhaust gas inside the spray protection cabinet to enter the cyclone mixing layer. The spraying layer sprays liquid onto the cyclone mixing layer, and the cyclone mixing layer agitates the gas and liquid mixture, which is then transported upwards. The gas and liquid mixture is further mixed in the packing layer, and moisture is removed in the dewatering layer.

2. The spray coating apparatus having a waste gas treatment function according to claim 1, characterized by: The dewatering layer is equipped with a dewatering component, which is a cyclone plate or a wire mesh demister.

3. The spray coating apparatus having a waste gas treatment function according to claim 1, characterized by: The spray layer is provided with a straight pipeline, which extends in a straight line and has multiple nozzles arranged along its extension direction, with the nozzles spraying downwards.

4. The spray coating apparatus having an exhaust gas treatment function according to claim 1, characterized by: The packing layer is filled with packing material, which is one or more combinations of Pall rings, Raschig rings, multifaceted hollow spheres, or stepped rings.

5. The spray coating apparatus having an exhaust gas treatment function according to claim 3, characterized by: The cyclone mixing layer is provided with multiple cyclone mixing tanks arranged side by side and a connecting box located on one side. The multiple cyclone mixing tanks are arranged side by side along the extension direction of the straight pipeline. Each cyclone mixing tank has an exhaust gas inlet at the top, an open bottom extending to the liquid circulation layer below, and a clean gas outlet on the side. The clean gas outlets of all cyclone mixing tanks are connected to the connecting box, which is connected to the spray protection cabinet. The number of cyclone mixing tanks is the same as the number of nozzles provided on the straight pipeline, and each nozzle is aligned with one cyclone mixing tank and located above the exhaust gas inlet of that cyclone mixing tank.

6. The spray coating apparatus having an exhaust gas treatment function according to claim 5, characterized by: The liquid circulation layer includes a bottom water tank, and a trough with an open top is provided in the bottom water tank. The bottom ends of the multiple cyclone mixing tanks are all submerged in the trough. A water outlet is provided on one side of the top of the trough, and an inclined water outlet guide plate is provided at the water outlet.

7. The spray coating apparatus having an exhaust gas treatment function according to claim 6, characterized by: The liquid circulation layer also includes a water tank located in the bottom pool. A filter screen is provided on one side of the water tank and is connected to the bottom pool through the filter screen. A water pump is provided on the top of the water tank. The input end of the water pump extends into the water tank, and the output end of the water pump is connected to a water delivery pipe. The water delivery pipe is connected to and communicates with the straight pipeline.

8. The spray coating apparatus having an exhaust gas treatment function according to claim 1, characterized by: The gas extraction mechanism includes an air supply pipe connected to the top of the tower, an air volume pleated filter box connected to the air supply pipe, and a negative pressure fan connected to the air volume pleated filter box.

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