A VOCs waste gas collection and purification device

Abstract

The invention relates to the field of waste gas treatment, and discloses a VOCs waste gas collection and purification treatment device, comprising a frame, on which a plurality of groups of absorption components are installed, the absorption components comprising a pipeline component and an absorption component, the absorption component comprising a pressure storage component and an absorption component, the absorption component comprising an absorption tank, an auger and a side pipe connected and communicated with the auger are coaxially installed inside the absorption tank, the side pipe comprises a vertical section, an upper connecting section used for connecting the upper end of the vertical section with the auger, and a lower connecting section used for connecting the lower end of the vertical section with the lower end of the auger, an air inlet is provided on the outer surface of the vertical section, the distance between the axis center line of the air inlet and the axis center line of the vertical section decreases from bottom to top, the waste gas bubbles entering the absorption tank through the air inlet are located in front of the side pipe along the rotation direction of the auger, and when the auger rotates to pull the chemical solution to flow, the chemical solution in the flowing state hinders the waste gas bubbles from rising.

Description

Technical Field

[0001] The present invention relates to the field of waste gas treatment, and in particular to a VOCs waste gas collection and purification treatment device. Background Art

[0002] VOCs waste gas refers to organic waste gas. The waste gas treatment methods include condensation recovery method, adsorption method, combustion method, absorption method, etc. Among them, the absorption method refers to introducing the waste gas into the absorption liquid, removing the pollutants through the physical combination or chemical reaction between the waste gas and the absorption liquid, and achieving the purpose of waste gas purification. In the prior art, the waste gas is generally only drawn into the tank storing the absorption liquid through the blower, air pump and other technologies, and the absorption liquid or waste gas is not operated accordingly after the waste gas enters, so that the waste gas purification efficiency and effect are relatively poor. For example, the Chinese invention patent with authorization announcement number CN109589745B discloses a VOCs adsorption device that can measure the VOCs concentration online. The waste gas enters the organic solution through a reduced intake pipe, and the auger speed is controlled by a control device to accelerate the mixing of the organic solution and the waste gas, as well as the rise of the waste gas and the speed of entering the organic solution from the intake pipe. It has some shortcomings, such as:

[0003] According to the drawings of this article on the prior art and the contents recorded in the text regarding accelerating the rise of exhaust gas and the speed at which it enters the organic solution from the intake pipe, it can be known that the rotation of the auger pulls the organic solution to flow upward, so as to achieve the purpose of accelerating the rise of exhaust gas and the speed at which it enters the organic solution from the intake pipe. Although the rotation of the auger can play a stirring role and accelerate the full mixing and contact between the exhaust gas and the solution, the auger will also pull the organic solution and the exhaust gas to flow upward together, so that the exhaust gas passes through the organic solution quickly, and the reaction time between the exhaust gas and the organic solution is shortened, which is not conducive to the full purification of the exhaust gas. In addition, although the reduced intake pipe can make the exhaust gas enter the organic solution at a faster speed at an oblique downward angle, the auger pulling the organic solution upward will offset the exhaust gas's component velocity in the vertical downward direction, resulting in the exhaust gas being closer to the liquid surface when it finally falls into the organic solution, which further shortens the reaction time between the exhaust gas and the organic solution, which is not conducive to the purification of the exhaust gas.

[0004] Based on the above, the present invention proposes a VOCs waste gas collection and purification treatment device. Summary of the invention

[0005] In order to solve the problems mentioned in the above background, the present invention provides a VOCs waste gas collection and purification treatment device.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0007] A VOCs waste gas collection and purification treatment device comprises a frame, a compressor is installed on the frame, an air inlet end of the compressor is used to receive waste gas, and an air outlet end is connected to a gas tank, an absorption mechanism is arranged at the bottom of the gas tank, the absorption mechanism comprises a plurality of groups of absorption components, waste gas transfer is achieved between two adjacent groups of absorption components through an air pump, the absorption components comprise a pipeline assembly and an absorption assembly, a plurality of groups of absorption assemblies are arranged in an array along the circumferential direction of the pipeline assembly, and the absorption assembly comprises a pressure storage component and an absorption component;

[0008] The absorption component includes an absorption tank, an auger is coaxially installed inside the absorption tank, the auger can rotate, the auger shaft of the auger is hollow inside and the upper end extends out of the absorption tank, and a side pipe connected to and communicated with the auger is also arranged in the absorption tank, and a plurality of side pipes are arranged in an array along the circumferential direction of the auger, and the side pipes include a vertical section, an upper connecting section for connecting the upper end of the vertical section with the auger, and a lower connecting section for connecting the lower end of the vertical section with the lower end of the auger, and an air inlet is arranged on the outer surface of the vertical section;

[0009] The distance between the axis line of the air inlet and the axis line of the vertical section decreases from bottom to top. The exhaust gas bubbles entering the absorption tank through the air inlet are located in front of the side pipe along the rotation direction of the auger. When the auger rotates and pulls the chemical solution to flow, the chemical solution in the flowing state hinders the exhaust gas bubbles from rising.

[0010] Furthermore, the pipeline assembly includes a vertically arranged rotating shaft and a motor that drives the rotating shaft to rotate. A support arranged on the outer cylindrical surface of the rotating shaft is connected to the absorption tank. An exhaust nozzle is arranged on the outer cylindrical surface of the rotating shaft. The outer surface of the absorption tank is connected to an exhaust pipe and the connection is higher than the height of the chemical solution in the absorption tank. The exhaust nozzle is connected to the exhaust pipe and a second solenoid valve is arranged at the connection. The lower open end of the rotating shaft is connected to the air inlet end of the air pump through a rotating joint.

[0011] Furthermore, a rotating groove is coaxially arranged at the upper closed end of the rotating shaft, and a fixed tube is coaxially installed in the rotating groove. The fixed tube is fixedly arranged on the frame, the lower end of the fixed tube is closed, the upper end is open and is connected to the gas outlet end of the gas tank or the air pump, and a gas injection hole is opened on the outer circumferential surface of the fixed tube. The groove wall of the rotating groove can block the opening of the gas injection hole, and a gas injection nozzle is arranged on the outer circumferential surface of the rotating shaft. When the rotating shaft rotates, the gas injection nozzle can be connected to the gas injection hole, and the gas injection nozzle is connected to the gas injection tube in the pressure storage component.

[0012] Furthermore, the pressure storage component includes a pressure storage tank, the lower end of which is closed and provided with a joint, the upper end of which is open and provided with a pressure storage tank cover, the pressure storage tank cover is provided with an exhaust hole, a piston is provided inside the pressure storage tank, a spring is provided between the piston and the pressure storage tank cover, the joint is connected to the air injection pipe, and a switching valve is provided at the bottom of the joint.

[0013] Further, the switching valve comprises a valve housing, a valve core is arranged in the valve housing, a valve stem extends from the end of the valve core, the end of the valve stem extends out of the valve housing, the extension direction of the valve stem is parallel to the radial direction of the rotating shaft, and a spring 2 is arranged on the side of the valve core away from the valve stem;

[0014] A fine hole is respectively arranged on the upper and lower end faces of the valve housing, and the two fine holes are coaxial. The upper end of the valve housing is connected to the joint and the fine hole located above is communicated with the joint. An annular groove is arranged on the outer circumferential surface of the valve core, and the upper end of the auger shaft is connected to the lower end of the valve housing and the auger shaft is communicated with the fine hole located below.

[0015] Furthermore, a fixed ring coaxial with the rotating shaft is installed on the frame, and the inner circular surface of the fixed ring includes arc surface one, arc surface two and a transition surface for connecting the two, the diameter of arc surface one is smaller than the diameter of arc surface two, and when the rotating shaft rotates with the absorption component, when the end of the valve stem contacts arc surface one, the annular groove is connected with the fine hole, and spring two is compressed; when the end of the valve stem contacts arc surface two, spring two releases its elastic force, so that the annular groove is not connected with the fine hole.

[0016] Furthermore, a liquid exchange tank is coaxially arranged on the end face of the lower open end of the rotating shaft, and a liquid exchange nozzle connected to the liquid exchange tank is also arranged on the outer cylindrical surface of the rotating shaft. A liquid exchange tube is arranged at the bottom of the absorption tank, and the liquid exchange nozzle is connected to the liquid exchange tube and an electromagnetic valve three is arranged at the connection. A connecting pipe is installed at the notch of the liquid exchange tank through a rotating joint, and a water pump is connected to the end of the connecting pipe.

[0017] A gear is arranged at the upper end of the auger, and a gear ring is coaxially arranged on the fixed ring, and the gear is meshed with the gear ring.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the process of purifying the exhaust gas by the absorption component of this scheme:

[0020] 1. The air inlet is arranged at an angle, so that the exhaust gas entering the absorption tank has a vertical downward component velocity, which enables the exhaust gas to first go deeper into the chemical solution, and then move upward after the initial vertical downward velocity reaches zero, thereby increasing the flow path of the exhaust gas in the chemical solution and thus the residence time of the exhaust gas in the chemical solution;

[0021] All air inlets are arranged on the vertical section of the side pipe, and when the auger rotates to pull the chemical solution to flow, the chemical solution in the flowing state hinders the exhaust gas bubbles from rising, which can further prolong the residence time of the exhaust gas bubbles in the chemical solution;

[0022] That is, it can greatly prolong the residence time of exhaust gas in the chemical solution and improve the exhaust gas purification effect.

[0023] 2. The rotation of the auger and the side pipe will stir the chemical solution to keep the concentration of each part of the chemical solution uniform. At the same time, because the exhaust gas bubbles entering the absorption tank through the air inlet are located just in front of the side pipe along its own rotation direction, when the exhaust gas just enters the chemical solution to form bubbles, it is immediately dispersed by the side pipe. The combination of the two can better make the exhaust gas and the chemical solution contact evenly and improve the exhaust gas purification effect.

[0024] 3. During the purification process, the second solenoid valve is closed, the purified air is above the liquid surface, and the exhaust gas is pushed into the auger by the piston. Therefore, on the one hand, the exhaust gas will move down a certain distance in the auger before entering the absorption tank through the air inlet hole, further improving the flow path of the exhaust gas in the chemical solution. On the other hand, the exhaust gas purification process is in a positive pressure state, which is beneficial to improve the reaction efficiency between the exhaust gas and the chemical solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 is a schematic diagram of an absorption component, an air pump and a motor;

[0027] Figure 3 is a schematic diagram of an absorption member;

[0028] Figure 4 is a schematic diagram of a fixed ring;

[0029] Figure 5 It is a schematic diagram of the pipeline assembly, the gas injection pipe, the exhaust pipe and the liquid exchange pipe;

[0030] Figure 6 is a cross-sectional view of a pipeline assembly;

[0031] Figure 7 is a schematic diagram of the absorption component;

[0032] Figure 8 is a cross-sectional view of a pressure storage component and a switching valve;

[0033] Fig. 9 is a cross-sectional view of a switching valve;

[0034] Fig.10 A cross-sectional view of the absorbent component.

[0035] The reference numerals in the accompanying drawings are:

[0036] 100, compressor; 101, gas tank; 102, air pump; 103, air inlet pipe; 104, air outlet pipe; 200, absorption mechanism; 201, pipeline assembly; 2011, rotating shaft; 2012, fixed pipe; 2013, air injection hole; 2014, air injection nozzle; 2015, exhaust nozzle; 2016, liquid exchange tank; 2017, liquid exchange nozzle; 2018, support; 202, pressure storage component; 2021, air injection pipe; 2022, pressure storage tank; 2023, piston; 2024, spring one; 20 25. Connector; 203. Absorbing component; 2031. Exhaust pipe; 2032. Liquid exchange pipe; 2033. Absorbing tank; 2034. Auger; 2035. Side pipe; 2036. Air inlet; 2037. Gear; 204. Motor; 205. Fixing ring; 2051. Arc surface one; 2052. Arc surface two; 206. Gear ring; 207. Switching valve; 2071. Valve housing; 2072. Valve core; 2073. Valve stem; 2074. Spring two; 2075. Fine hole; 2076. Ring groove. DETAILED DESCRIPTION

[0037] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0038] Reference Figure 1-Figure 10 A VOCs waste gas collection and purification treatment device includes a frame, on which a compressor 100 is installed. The air inlet end of the compressor 100 is used to receive the waste gas. For example, an air collecting hood is set at the place where the waste gas is generated. The air inlet end of the compressor 100 is connected to the air collecting hood. The waste gas is sucked through the compressor 100 and injected into a gas tank 101 connected to the air outlet end of the compressor 100.

[0039] An absorption mechanism 200 is provided at the bottom of the gas tank 101, which is used to purify the exhaust gas by absorption. There are many types of pollutants in the exhaust gas, so the exhaust gas needs to be treated in sequence by different chemical solutions. Therefore, the absorption mechanism 200 includes multiple groups of absorption components, and an air pump 102 is provided between two adjacent groups of absorption components. The air inlet end of the air pump 102 is connected to the output end of one group of absorption components, and the air outlet end is connected to the input end of another group of absorption components, so as to realize the transfer of exhaust gas between two adjacent groups of absorption components.

[0040] Reference Figure 2 and Figure 3The absorption component includes a pipeline component 201 and an absorption component, wherein the absorption component is arranged in a plurality of groups in an array along the circumferential direction of the pipeline component 201, and the absorption component includes a pressure storage component 202 and an absorption component 203. The pressure storage component 202 is used to receive the exhaust gas and perform pressure storage treatment, so that the exhaust gas enters the absorption component 203 in a downward direction and at a faster speed, so that the exhaust gas can enter deeper into the chemical solution, and the exhaust gas purification is in a positive pressure environment. The increased pressure is conducive to accelerating the reaction efficiency between the exhaust gas and the chemical solution and improving the purification effect.

[0041] 1. Pipeline component 201:

[0042] Reference Figure 5 and Figure 6 The pipeline assembly 201 includes a vertically arranged rotating shaft 2011, and the rotating shaft 2011 is driven to rotate by a motor 204 arranged on a frame.

[0043] The lower end of the rotating shaft 2011 is open and connected to the air inlet pipe 103 through a rotating joint. The upper end of the rotating shaft 2011 is closed and coaxially provided with a rotating groove, and a fixed pipe 2012 is coaxially installed in the rotating groove.

[0044] The fixed tube 2012 is fixedly set on the frame, the upper end of the fixed tube 2012 is open and connected to the gas tank 101 or the gas outlet pipe 104, and a solenoid valve is set at the connection, the lower end of the fixed tube 2012 is closed, the outer cylindrical surface of the fixed tube 2012 is provided with a gas injection hole 2013, and the opening of the gas injection hole 2013 can be blocked by the groove wall of the rotating groove, and the outer cylindrical surface of the rotating shaft 2011 is provided with a gas injection nozzle 2014. When the rotating shaft 2011 rotates, the gas injection nozzle 2014 can be connected with the gas injection hole 2013. In addition, the gas injection nozzle 2014 is used to connect with the gas injection tube 2021 in the pressure storage component 202. Therefore, a plurality of gas injection nozzles 2014 are set corresponding to the number of absorption components.

[0045] The outer cylindrical surface of the rotating shaft 2011 is also provided with an exhaust nozzle 2015, and the exhaust nozzle 2015 is used to connect with the exhaust pipe 2031 in the absorbing component 203, so a plurality of exhaust nozzles 2015 are correspondingly provided. In addition, a solenoid valve 2 is provided at the connection between the exhaust nozzle 2015 and the exhaust pipe 2031.

[0046] A liquid exchange tank 2016 is coaxially arranged on the end face of the lower open end of the rotating shaft 2011, and a liquid exchange nozzle 2017 connected to the liquid exchange tank 2016 is also arranged on the outer cylindrical surface of the rotating shaft 2011. The liquid exchange nozzle 2017 is used to connect with the liquid exchange tube 2032 in the absorption component 203, and therefore a plurality of liquid exchange nozzles are correspondingly arranged. In addition, a solenoid valve three is arranged at the connection between the liquid exchange nozzle 2017 and the liquid exchange tube 2032. In addition, a connecting pipe is installed at the notch of the liquid exchange tank 2016 through a rotating joint. When the chemical solution in the absorption component 203 is saturated and needs to be replaced, the solenoid valve three is opened, the chemical solution is emptied by the water pump technology, and a new chemical solution is injected, and then the solenoid valve three is closed. It should be noted that the liquid level of the chemical solution is lower than the height of the exhaust nozzle 2015.

[0047] 2. Pressure storage component 202:

[0048] Reference Figure 3 The outer cylindrical surface of the rotating shaft 2011 is provided with a support 2018, the absorbing component 203 is installed on the support 2018, and the pressure storage component 202 is installed on the upper end of the absorbing component 203. Therefore, when the rotating shaft 2011 rotates, it will rotate with the pressure storage component 202 and the absorbing component 203.

[0049] Reference Figure 8 The pressure storage component 202 includes a pressure storage tank 2022, the lower end of the pressure storage tank 2022 is closed and provided with a joint 2025, the upper end is open and provided with a pressure storage tank cover, the pressure storage tank cover is provided with an exhaust hole, a piston 2023 is sleeved in the pressure storage tank 2022, a spring 2024 is provided between the piston 2023 and the pressure storage tank cover, the joint 2025 is connected to the gas injection pipe 2021, and a switching valve 207 is provided at the bottom of the joint 2025. When the switching valve 207 is closed and the gas injection pipe 2021 is connected to the gas injection hole 2013, since the gas tank 101 is full of compressed exhaust gas, the exhaust gas can quickly enter the pressure storage tank 2022 and move the piston 2023 upward, and the spring 2024 is compressed. When the switching valve 207 is opened and the gas injection pipe 2021 is not connected to the gas injection hole 2013, the spring 2024 releases the elastic force to drive the exhaust gas to flow downward.

[0050] Reference Fig. 9 The switching valve 207 includes a valve housing 2071, a valve core 2072 is arranged in the valve housing 2071, a valve stem 2073 extends from the end of the valve core 2072, the end of the valve stem 2073 extends out of the valve housing 2071, the extension direction of the valve stem 2073 is parallel to the radial direction of the rotating shaft 2011, and a spring 2074 is arranged on the side of the valve core 2072 away from the valve stem 2073.

[0051] A fine hole 2075 is respectively arranged on the upper and lower end faces of the valve housing 2071, and the two fine holes 2075 are coaxial. The upper end of the valve housing 2071 is connected to the joint 2025 and the fine hole 2075 located above is communicated with the joint 2025. An annular groove 2076 is arranged on the outer circumferential surface of the valve core 2072. Initially, the spring 2074 is not compressed, the annular groove 2076 and the fine hole 2075 are misaligned and not communicated, and the switching valve 207 is closed. When the valve stem 2073 is pushed and moves with the valve core 2072, the spring 2074 is compressed, so that the annular groove 2076 can be communicated with the fine hole 2075, and the switching valve 207 is opened. At this time, since the aperture of the fine hole 2075 is small, the exhaust gas is output at a faster speed.

[0052] Reference Figure 3 and Figure 4 A fixed ring 205 coaxial with the rotating shaft 2011 is installed on the frame, and the inner circular surface of the fixed ring 205 includes an arc surface 1 2051, an arc surface 2052 and a transition surface for connecting the two, wherein the diameter of the arc surface 1 2051 is smaller than the diameter of the arc surface 2052.

[0053] When the rotating shaft 2011 is driven to rotate by the motor 204, the pressure storage component 202 and the absorption component 203 will rotate together. During this process, the end of the valve stem 2073 either contacts the arc surface 1 2051 or contacts the arc surface 2052. When it contacts the arc surface 1 2051, the switching valve 207 is opened, and when it contacts the arc surface 2052, the switching valve 207 is closed. It should be noted that the central angle of the arc surface 2052 is much smaller than the central angle of the arc surface 1 2051.

[0054] 3. Absorbing component 203:

[0055] Reference Figure 7 and Fig.10 The absorption component 203 includes an absorption tank 2033 connected to the support 2018, the connection between the absorption tank 2033 and the liquid exchange pipe 2032 is located at the bottom of the tank, and the connection between the absorption tank 2033 and the exhaust pipe 2031 is close to the absorption tank cover.

[0056] An auger 2034 is coaxially installed inside the absorption tank 2033. The auger shaft of the auger 2034 is hollow inside and the upper end extends out of the absorption tank 2033 and is connected to the lower end of the valve housing 2071, and the auger shaft is connected to the fine hole 2075 located below.

[0057] A gear 2037 is provided at the upper end of the auger 2034, and a ring gear 206 is coaxially provided on the fixed ring 205. The gear 2037 meshes with the ring gear 206. When the absorbing component 203 rotates following the rotating shaft 2011, the auger 2034 can rotate through the cooperation of the gear 2037 and the ring gear 206.

[0058] A side pipe 2035 connected to the auger 2034 is also provided in the absorption tank 2033. A plurality of side pipes 2035 are arranged in an array along the circumferential direction of the auger 2034, and two are shown in the attached figure of this scheme.

[0059] Furthermore, the side pipe 2035 includes a vertical section, an upper connecting section for connecting the upper end of the vertical section with the auger 2034, and a lower connecting section for connecting the lower end of the vertical section with the lower end of the auger 2034. Since the bottom of the tank is generally arc-shaped, the upper connecting section is horizontally arranged and the lower connecting section is arc-shaped.

[0060] The interior of the side pipe 2035 is hollow and both ends are connected to the auger shaft of the auger 2034 . A plurality of air inlet holes 2036 are distributed in an array on the outer surface of the side pipe 2035 .

[0061] After the pressure accumulator 2022 is fully filled with waste gas and the switching valve 207 is opened, the waste gas enters the auger 2034 through the switching valve 207 and finally enters the absorption tank 2033 through the air inlet 2036;

[0062] At the same time, the auger 2034 rotates together with the side pipe 2035, so that the exhaust gas and the chemical solution are fully mixed and contacted.

[0063] In a preferred embodiment, the air inlet 2036 is arranged at an angle, and the opening of the air inlet 2036 set on the outer wall of the side pipe 2035 is higher than the opening set on the inner wall of the side pipe 2035. In this way, the exhaust gas entering the absorption tank 2033 has a vertical downward component velocity, which can make the exhaust gas first move downward deeper into the chemical solution, and then move upward after the initial vertical downward velocity reaches zero, thereby increasing the flow path of the exhaust gas in the chemical solution, thereby increasing the reaction time and achieving a better purification effect.

[0064] In a preferred embodiment, when gas enters the liquid, it generally takes the form of bubbles. The exhaust gas bubbles that enter the absorption tank 2033 through the air inlet 2036 are located just in front of the side pipe 2035 along its own rotation direction. In this way, when the exhaust gas just enters the chemical solution to form bubbles, it is immediately dispersed by the side pipe 2035, and is in better contact with the chemical solution, resulting in a better purification effect. On the contrary, if the exhaust gas bubbles are located behind the side pipe 2035, they can only be dispersed by the next side pipe 2035, which is not timely. The exhaust gas after being dispersed has already floated up for a distance, and the purification effect is relatively poor.

[0065] In a preferred embodiment, all the air inlet holes 2036 are arranged on the vertical section of the side pipe 2035, and when the auger 2034 rotates to pull the chemical solution to flow, the chemical solution in the flowing state hinders the exhaust gas bubbles from rising, thereby further extending the residence time of the exhaust gas bubbles in the chemical solution and improving the purification effect.

[0066] Furthermore, there are two types of obstruction:

[0067] First, if Fig.10 As shown, when the auger 2034 rotates, it pulls the chemical solution to flow upward, so the flow trajectory of the chemical solution in the absorption tank 2033 is as follows: Fig.10 As shown by the dotted lines in the figure, the part close to the auger 2034 flows upward, and the part away from the auger 2034 flows downward, and the vertical section of the side pipe 2035 is far away from the auger 2034. Therefore, the exhaust gas bubbles entering the chemical solution through the air inlet 2036 will be hindered by the downward flowing chemical solution, thereby achieving the purpose of prolonging the residence time of the exhaust gas bubbles in the chemical solution.

[0068] Second, similar to the first method, the vertical section of the side pipe 2035 is close to the auger 2034, so when the auger 2034 rotates, it should pull the chemical solution downward, and the flow pattern is similar to Fig.10 The opposite is true, so that the exhaust gas bubbles are also hindered by the downward flowing chemical solution, thereby achieving the purpose of prolonging the residence time of the exhaust gas bubbles in the chemical solution.

[0069] Working principle of the present invention:

[0070] The present invention achieves the purpose of exhaust gas purification by pulling the exhaust gas through a plurality of groups of absorption components in sequence through the cooperation of the compressor 100 and the air pump 102. The core of the present solution is the purification of the exhaust gas by the absorption components. The specific purification process is as follows:

[0071] The motor 204 drives the rotating shaft 2011 to rotate, and the absorbing component rotates together. During the rotation process:

[0072] During the contact between the valve stem 2073 of the switching valve 207 and the second arc surface 2052, the switching valve 207 is in a closed state, the gas injection hole 2013 is connected with the corresponding gas injection nozzle 2014, the exhaust gas is drawn into the pressure storage tank 2022 through the compressor 100 or the air pump 102, and the spring 1 2024 is compressed;

[0073] Afterwards, during the contact process between the valve stem 2073 of the switching valve 207 and the arc surface 1 2051, the switching valve 207 is in an open state, the gas injection hole 2013 is not connected to the corresponding gas injection nozzle 2014, and the spring 1 2024 releases its elastic force, so that the exhaust gas enters the auger 2034 through the switching valve 207, and finally enters the chemical solution in the absorption tank 2033 through the air inlet 2036. At the same time, under the cooperation of the gear ring 206 and the gear 2037, the auger 2034 rotates together with the side pipe 2035. The rotation action and the exhaust gas entry action are combined to achieve a full mixing reaction between the exhaust gas and the chemical solution, thereby achieving the purpose of purification. During the purification process, the integrated auger and side pipe structure can achieve the following effects:

[0074] 1. The air inlet is arranged at an angle, so that the exhaust gas entering the absorption tank has a vertical downward component velocity, which enables the exhaust gas to first go deeper into the chemical solution, and then move upward after the initial vertical downward velocity reaches zero, thereby increasing the flow path of the exhaust gas in the chemical solution and thus the residence time of the exhaust gas in the chemical solution;

[0075] All air inlets are arranged on the vertical section of the side pipe, and when the auger rotates to pull the chemical solution to flow, the chemical solution in the flowing state hinders the exhaust gas bubbles from rising, which can further prolong the residence time of the exhaust gas bubbles in the chemical solution;

[0076] That is, it can greatly prolong the residence time of exhaust gas in the chemical solution and improve the exhaust gas purification effect.

[0077] 2. The rotation of the auger and the side pipe will stir the chemical solution to keep the concentration of each part of the chemical solution uniform. At the same time, because the exhaust gas bubbles entering the absorption tank through the air inlet are located just in front of the side pipe along its own rotation direction, when the exhaust gas just enters the chemical solution to form bubbles, it is immediately dispersed by the side pipe. The combination of the two can better make the exhaust gas and the chemical solution contact evenly and improve the exhaust gas purification effect.

[0078] 3. During the purification process, the second solenoid valve is closed, the purified air is above the liquid surface, and the exhaust gas is pushed into the auger by the piston. Therefore, on the one hand, the exhaust gas will move down a certain distance in the auger before entering the absorption tank through the air inlet hole, further improving the flow path of the exhaust gas in the chemical solution. On the other hand, the exhaust gas purification process is in a positive pressure state, which is beneficial to improve the reaction efficiency between the exhaust gas and the chemical solution.

[0079] After the purification is completed, the solenoid valve 2 opens, and the purified exhaust gas is drawn by the air pump and flows into the next absorption component.

[0080] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A VOCs waste gas collection and purification device, comprising a frame, a compressor (100) is installed on the frame, the air inlet end of the compressor (100) is used to receive waste gas, and the air outlet end is connected to a gas tank (101), and an absorption mechanism (200) is arranged at the bottom of the gas tank (101), and the absorption mechanism (200) includes a plurality of groups of absorption components, and waste gas is transferred between two adjacent groups of absorption components through an air pump (102), characterized in that: The absorption component comprises a pipeline component (201) and an absorption component, wherein a plurality of groups of the absorption components are arranged in an array along the circumferential direction of the pipeline component (201), and the absorption component comprises a pressure storage component (202) and an absorption component (203); The absorption component (203) comprises an absorption tank (2033), an auger (2034) is coaxially mounted inside the absorption tank (2033), the auger (2034) is rotatable, the auger shaft of the auger (2034) is hollow inside and the upper end extends out of the absorption tank (2033), a side pipe (2035) connected to and in communication with the auger (2034) is also arranged inside the absorption tank (2033), a plurality of side pipes (2035) are arranged in an array along the circumferential direction of the auger (2034), the side pipes (2035) comprise a vertical section, an upper connecting section for connecting the upper end of the vertical section with the auger (2034), and a lower connecting section for connecting the lower end of the vertical section with the lower end of the auger (2034), and an air inlet (2036) is arranged on the outer surface of the vertical section; The distance between the axis of the air inlet (2036) and the axis of the vertical section decreases from bottom to top, and the exhaust gas bubbles entering the absorption tank (2033) through the air inlet (2036) are located in front of the side pipe (2035) along the rotation direction of the auger (2034). When the auger (2034) rotates to pull the chemical solution to flow, the chemical solution in the flowing state prevents the exhaust gas bubbles from rising; The pipeline assembly (201) comprises a vertically arranged rotating shaft (2011) and a motor (204) for driving the rotating shaft (2011) to rotate; a support (2018) arranged on the outer circumferential surface of the rotating shaft (2011) is connected to the absorption tank (2033); an exhaust nozzle (2015) is arranged on the outer circumferential surface of the rotating shaft (2011); an outer surface of the absorption tank (2033) is connected to an exhaust pipe (2031) and the connection is higher than the height of the chemical solution in the absorption tank (2033); the exhaust nozzle (2015) is connected to the exhaust pipe (2031) and a second solenoid valve is arranged at the connection; and a lower open end of the rotating shaft (2011) is connected to an air inlet end of an air pump (102) via a rotating joint; A rotating groove is coaxially arranged at the upper closed end of the rotating shaft (2011), a fixed pipe (2012) is coaxially installed in the rotating groove, the fixed pipe (2012) is fixedly arranged on the frame, the lower end of the fixed pipe (2012) is closed, the upper end is open and connected to the gas outlet end of the gas tank (101) or the gas pump (102), the outer circumferential surface of the fixed pipe (2012) is provided with a gas injection hole (2013), the groove wall of the rotating groove can block the opening of the gas injection hole (2013), the outer circumferential surface of the rotating shaft (2011) is provided with a gas injection nozzle (2014), when the rotating shaft (2011) rotates, the gas injection nozzle (2014) can be connected to the gas injection hole (2013), and the gas injection nozzle (2014) is connected to the gas injection pipe (221) in the pressure storage component (202).

2. A VOCs waste gas collection and purification device according to claim 1, characterized in that: The pressure storage component (202) comprises a pressure storage tank (2022), the lower end of the pressure storage tank (2022) is closed and provided with a joint (2025), the upper end is open and provided with a pressure storage tank cover, the pressure storage tank cover is provided with an exhaust hole, a piston (2023) is sleeved in the pressure storage tank (2022), a spring (2024) is provided between the piston (2023) and the pressure storage tank cover, the joint (2025) is connected to the gas injection pipe (221), and a switching valve (207) is provided at the bottom of the joint (2025).

3. A VOCs waste gas collection and purification device according to claim 2, characterized in that: The switching valve (207) comprises a valve housing (2071), a valve core (2072) is arranged in the valve housing (2071), a valve stem (2073) extends from the end of the valve core (2072), the end of the valve stem (2073) protrudes from the valve housing (2071), the extension direction of the valve stem (2073) is parallel to the radial direction of the rotation axis (2011), and a second spring (2074) is arranged on the side of the valve core (2072) away from the valve stem (2073); A fine hole (2075) is respectively provided on the upper and lower end surfaces of the valve housing (2071), and the two fine holes (2075) are coaxial. The upper end of the valve housing (2071) is connected to the joint (2025) and the fine hole (2075) located at the top is communicated with the joint (2025). An annular groove (2076) is provided on the outer circumferential surface of the valve core (2072), and the upper end of the auger shaft is connected to the lower end of the valve housing (2071) and the auger shaft is communicated with the fine hole (2075) located at the bottom.

4. A VOCs waste gas collection and purification device according to claim 3, characterized in that: A fixing ring (205) coaxial with the rotating shaft (2011) is mounted on the frame. The inner circumferential surface of the fixing ring (205) includes an arc surface 1 (2051), an arc surface 2 (2052), and a transition surface for connecting the two. The diameter of the arc surface 1 (2051) is smaller than the diameter of the arc surface 2 (2052). When the rotating shaft (2011) rotates with the absorption component, when the end of the valve stem (2073) contacts the arc surface 1 (2051), the annular groove (2076) is connected to the fine hole (2075), and the second spring (2074) is compressed. When the end of the valve stem (2073) contacts the arc surface 2 (2052), the second spring (2074) releases its elastic force, so that the annular groove (2076) is not connected to the fine hole (2075).

5. A VOCs waste gas collection and purification device according to claim 1, characterized in that: A liquid exchange tank (2016) is coaxially arranged on the end surface of the lower open end of the rotating shaft (2011); a liquid exchange nozzle (2017) connected to the liquid exchange tank (2016) is also arranged on the outer circumferential surface of the rotating shaft (2011); a liquid exchange tube (2032) is arranged at the tank bottom of the absorption tank (2033); the liquid exchange nozzle (2017) is connected to the liquid exchange tube (2032) and a solenoid valve three is arranged at the connection; a connecting tube is installed at the notch of the liquid exchange tank (2016) via a rotating joint, and a water pump is connected to the end of the connecting tube.

6. A VOCs waste gas collection and purification device according to claim 4, characterized in that: A gear (2037) is arranged at the upper end of the auger (2034), a gear ring (206) is coaxially arranged on the fixing ring (205), and the gear (2037) is meshed with the gear ring (206).

Images