Phenol waste gas purification treatment device

Abstract

The invention relates to the technical field of waste gas treatment, and particularly discloses a phenol waste gas purification treatment device which comprises a shell assembly, a gas inlet and a gas outlet are formed in the two ends of a shell main body correspondingly, a first cavity is formed in the shell main body, a Venturi tube is installed in the first cavity, and a solution box is arranged at the top of the first cavity; the bottom of the first cavity is a recovery tank, a corrugated demisting plate is mounted on the right side of the first cavity, a second Venturi channel is formed in the right side of the corrugated demisting plate, and rotating assemblies are mounted on the upper portion and the lower portion of the second Venturi channel correspondingly. According to the phenol waste gas treatment device, a chemical absorption and photocatalysis combined mode is utilized to increase the concentration treatment range of phenol waste gas, so that the phenol waste gas treatment device can adapt to a wider range of 10-5000 PPM, and the characteristics of chemical absorption and photocatalysis are utilized to realize a better treatment effect at both high concentration and low concentration.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas treatment, and more particularly to a device for purifying and treating phenol waste gas. Background Art

[0002] Phenol is an organic compound, a colorless needle-shaped crystal with a distinctive odor. It is toxic and an important raw material for the production of certain resins, fungicides, preservatives, and medicines. It can also be used to disinfect surgical instruments and treat excrement, kill skin bacteria, relieve itching and otitis media. It has a melting point of 43°C and is slightly soluble in water at room temperature. It is easily soluble in organic solvents. When the temperature is higher than 65°C, it can be miscible with water in any proportion. Phenol is corrosive and will denature local proteins upon contact. Its solution can be washed with alcohol when it comes into contact with the skin. A small amount of phenol is oxidized to quinone by oxygen when exposed to air and turns pink. It turns purple when it encounters trivalent iron ions. This method is usually used to test phenol.

[0003] Chinese invention patent publication number CN113041740A discloses a waste gas treatment device for a phenol production workshop, comprising a filter box, an electric heating pipe, an air intake pipe, and an exhaust fan. A filter tank and a disinfection tank are respectively provided on both sides of the inner wall of the filter box. An air guide pipe is plugged into the top of the filter tank, a mounting groove is provided on the surface of the air intake pipe, and a support rod is fixedly connected to the inner wall of one end of the air guide pipe. The waste gas treatment device for a phenol production workshop, through the coordinated arrangement of the air intake pipe and the exhaust fan, can directly collect toxic waste gas during the phenol production process to prevent toxic gas from causing harm to workers. The filter screen can filter larger particulate matter in the gas, thereby extending the use time of the medicinal solution in the filter tank and the disinfection tank.

[0004] Currently, phenol waste gas is usually treated by solution absorption, photocatalysis or biological treatment. The adaptability of various methods is different. There is currently no better combined treatment solution, and the treatment methods for high concentrations and low concentrations are not highly applicable. In addition, when using photocatalysis, the catalytic effect of the catalyst is reduced, which is a persistent problem. The existing structure cannot apply better treatment measures in the treatment stage to stabilize the catalytic efficiency for a long time. At the same time, the existing structure cannot cope with changes in flow rate, and the fixed purification efficiency has limitations for different wind speeds. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device for purifying and treating phenol waste gas to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a device for purifying phenol waste gas, comprising a housing assembly, wherein the housing body has an air inlet and an air outlet at both ends thereof, a first chamber is provided inside the housing body, a venturi tube is installed inside the first chamber, a solution tank is provided at the top of the first chamber, and a recovery tank is provided at the bottom, a corrugated demister plate is provided on the right side of the first chamber, a second venturi channel is provided on the right side of the corrugated demister plate, rotating assemblies are respectively installed above and below the second venturi channel, the rotating assembly is connected to a cleaning assembly by a belt, the cleaning assembly is installed inside a photocatalytic chamber, an ultraviolet lamp is installed at the center of the photocatalytic chamber, and a cam assembly is installed on the side of the cleaning assembly;

[0007] The cleaning assembly includes a cleaning main rod, the front of the cleaning main rod is fixedly connected to a first pulley and a cam body, the first pulley is connected to the rotating assembly through a belt, a cam assembly is installed on the side of the cam body, the cam body drives the cam assembly to vibrate, and the back of the cleaning main rod is fixedly connected to a cleaning frame

[0008] Furthermore, the Venturi tube includes a tube body, a fixed inner tube is fixedly connected to the interior of the tube body, a movable inner tube is installed inside the fixed inner tube, one end of the movable inner tube is installed inside the fixed inner tube, and the other end is fixedly connected to a movable baffle, a sliding rod is hinged on the outer side of the movable baffle, and the other end of the sliding rod is installed on the air inlet end of the tube body.

[0009] Furthermore, the movable inner tube includes a movable outer rod and a movable long rod, the outer side of the movable long rod is sleeved with an outer spring, one end of the movable long rod is fixedly connected to the inside of the movable outer rod, and the other end is fixedly connected to the inner circular plate, the fixed inner tube includes a fixed tube body, the interior of the fixed tube body is provided with a solution circular groove connected to the liquid inlet groove, the liquid inlet groove is connected to the solution tank at the top, the solution circular groove is connected to the spraying chamber, and the outer side of the spraying chamber is provided with multiple spraying ports.

[0010] Furthermore, a catalyst module is attached to the inner wall of the photocatalytic chamber, and an arc-shaped replacement groove is opened on the back of the photocatalytic chamber. The catalyst module is a replaceable component.

[0011] Furthermore, a circulation groove is provided on the plane of the cam body where the photocatalytic chamber is located, and a one-way valve groove is provided on the side of the circulation groove. The one-way valve groove is composed of a horizontal tube and a vertical tube. A placement groove is provided inside the horizontal tube. A one-way valve and a phenol detector are installed inside the placement groove. The other end of the one-way valve groove is connected to the air outlet.

[0012] Furthermore, the cleaning frame is composed of a circular frame, a side of the circular frame is provided with an air blowing hole, the circular frame is installed on the side of the ultraviolet lamp, and the air blowing hole is communicated with the air inlet.

[0013] Furthermore, an air intake pipe is provided at the bottom of the photocatalytic chamber, and the air intake pipe is used to collect the attachments on the catalyst module blown up by the cleaning component in the photocatalytic chamber.

[0014] Furthermore, a porous ceramic humidity-regulating layer is installed on the side of the corrugated demisting plate, a buffer section is set at the front end of the photocatalytic reaction stage, and a hydrophobic coating is lined on the inside.

[0015] Technical effects and advantages of the present invention:

[0016] 1. The present invention is provided with a venturi tube and a cleaning component, which is beneficial to increase the range of phenol waste gas concentration treatment by combining chemical absorption and photocatalysis, so that it can adapt to the range of 10-5000PPM. By utilizing the characteristics of chemical absorption and photocatalysis, it can achieve good treatment effects at both high and low concentrations.

[0017] 2. The present invention is advantageous in utilizing the change of flow rate by providing a Venturi tube, so that the movable inner tube moves to the right, the number of nozzles used in the fixed inner tube increases, the amount of sprayed solution increases, and a positive correlation is achieved with the wind speed and flow rate, thereby realizing self-adjustment of the chemical absorption efficiency when the flow rate changes.

[0018] 3. The present invention is provided with a cleaning component, which is conducive to utilizing the rotation of the rotating component to drive the cam body to make the cam component reciprocate, so that part of the gas discharged from the outlet enters the interior of the one-way valve groove and is ejected from the blowing hole to blow and clean the surface of the catalyst module. The catalytic efficiency of the catalyst surface is always subject to the contactless cleaning effect, maintaining a relatively stable catalytic efficiency and greatly increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a front cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 It is a cross-sectional view of the overall structure of the present invention.

[0022] Figure 4 It is a cross-sectional view of the housing component structure of the present invention.

[0023] Figure 5 It is a schematic diagram of the structure of the Venturi tube of the present invention.

[0024] Figure 6 It is a schematic diagram of the fixed inner tube structure of the present invention.

[0025] Figure 7 It is a schematic structural diagram of the cleaning component of the present invention.

[0026] Figure 8It is a schematic structural diagram of the cam assembly of the present invention.

[0027] The accompanying drawings are marked as follows: 1. housing assembly; 101. housing body; 102. air inlet; 103. air outlet; 104. solution tank; 105. threaded plate; 106. recovery tank; 107. first chamber; 108. second venturi channel; 109. photocatalytic chamber; 110. air intake pipe; 111. one-way valve slot; 112. placement slot; 2. venturi tube; 201. tube body; 202. movable inner tube; 2021. movable outer rod; 2022. movable long rod; 2023. outer spring; 2024. Inner circular plate; 203, movable baffle; 204, sliding rod; 205, fixed inner tube; 2051, fixed tube body; 2052, solution circular groove; 2053, spray chamber; 2054, liquid inlet tank; 3, corrugated defogger plate; 4, rotating assembly; 5, cleaning assembly; 501, cleaning main rod; 502, first pulley; 503, cam body; 504, air inlet; 505, cleaning frame; 506, blowing hole; 6, belt; 7, ultraviolet lamp; 8, cam assembly; 801, cam rod; 802, cam spring. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. In addition, the forms of the various structures described in the following embodiments are merely examples. The device for purifying and treating phenol-based waste gas involved in the present invention is not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work fall within the scope of protection of the present invention.

[0029] Reference Figures 1-4 The present invention provides a phenol waste gas purification device, comprising a housing assembly 1, an air inlet 102 and an air outlet 103 at both ends of a housing body 101, a first chamber 107 is provided inside the housing body 101, a venturi tube 2 is installed inside the first chamber 107, a solution tank 104 is provided at the top of the first chamber 107, a recovery tank 106 is provided at the bottom, a corrugated demister plate 3 is installed on the right side of the first chamber 107, a second venturi channel 108 is provided on the right side of the corrugated demister plate 3, a rotating assembly 4 is installed above and below the second venturi channel 108, the rotating assembly 4 is connected to a cleaning assembly 5 by a belt 6, the cleaning assembly 5 is installed inside a photocatalytic chamber 109, an ultraviolet lamp 7 is installed at the center of the photocatalytic chamber 109, and a cam assembly 8 is installed on the side of the cleaning assembly 5;

[0030] In this embodiment, it is necessary to specifically explain that: the sodium hydroxide solution sprayed from the fixed inner tube 205 is mixed to form soluble sodium phenolate, which quickly reduces the concentration of sodium phenolate in the exhaust gas, and is applicable to a content range of one hundred to five thousand PPM. The photocatalytic section is applicable to a range of ten to two hundred PPM. The combination of the two makes the device adaptable to a wider concentration range and has a higher treatment efficiency.

[0031] The main difference between this embodiment and the prior art is that this embodiment uses a combination of chemical absorption and photocatalysis to expand the treatment range of phenol exhaust gas concentration to adapt to the range of 50 to 5,000 PPM. By utilizing the characteristics of chemical absorption and photocatalysis, it achieves good treatment effects for both high and low concentrations. At the same time, by utilizing the change in flow rate, it realizes the ability to self-adjust the chemical absorption efficiency and automatically treat the surface of the catalyst module, specifically in the venturi tube 2 and the cleaning component 5;

[0032] The above structure is the main structure of this embodiment, which solves the current problem that the absorption efficiency cannot be adjusted when the flow rate changes, and at the same time solves the problem of reduced catalytic efficiency after long-term use. The rotating component 4 is an existing structure, and the specific structure and connection method of the rotating component 4 are not described in detail in this embodiment.

[0033] Reference Figure 3 A porous ceramic humidity-regulating layer is installed on the side of the corrugated demisting plate 3, which is filled with diatomaceous earth porous ceramics after gas-liquid separation to absorb excess moisture and release it when the airflow is dry to achieve dynamic balance.

[0034] In this embodiment, it is necessary to specifically explain that: a buffer section is provided at the front end of the photocatalytic reaction stage, and is lined with a hydrophobic coating such as polytetrafluoroethylene to prevent residual droplets from adhering to the catalyst. The catalyst module uses fluorine-doped TiO2 to improve alkali resistance and prevent sodium hydroxide corrosion.

[0035] Reference Figure 5 The venturi tube 2 includes a tube body 201, a fixed inner tube 205 is fixedly connected to the inside of the tube body 201, a movable inner tube 202 is installed inside the fixed inner tube 205, one end of the movable inner tube 202 is installed inside the fixed inner tube 205, and the other end is fixedly connected to a movable baffle 203, a sliding rod 204 is hinged on the outer side of the movable baffle 203, and the other end of the sliding rod 204 is installed on the air inlet end of the tube body 201.

[0036] In this embodiment, it is necessary to specifically explain that: the gas enters the interior of the outer shell assembly 1 from the air inlet 102, and under the guidance of the threaded plate 105, the gas rotates and enters the venturi tube 2. Under the action of the venturi tube 2, the gas is accelerated to pass through the right side of the tube body 201 and mixes with the sodium hydroxide solution sprayed by the fixed inner tube 205 to form soluble sodium phenol, which quickly reduces the concentration of sodium phenol in the exhaust gas to below 200 PPM.

[0037] Reference Figure 6 The movable inner tube 202 includes a movable outer rod 2021 and a movable long rod 2022. The outer side of the movable long rod 2022 is sleeved with an outer spring 2023. One end of the movable long rod 2022 is fixedly connected to the inside of the movable outer rod 2021, and the other end is fixedly connected to the inner circular plate 2024. The fixed inner tube 205 includes a fixed tube body 2051. A solution circular groove 2052 is opened inside the fixed tube body 2051 and is connected to the liquid inlet groove 2054. The liquid inlet groove 2054 is connected to the solution tank 104 at the top. The solution circular groove 2052 is connected to the spraying chamber 2053. A plurality of spraying ports are opened on the outside of the spraying chamber 2053.

[0038] In this embodiment, it should be specifically explained that: when the flow rate increases, the resistance of the movable baffle 203 increases, causing the movable inner tube 202 to move to the right, and the inner circular plate 2024 moves to the right inside the spraying chamber 2053. The liquid enters the left side of the spraying chamber 2053 from the liquid inlet groove 2054 and the solution circular groove 2052. As the movable long rod 2022 moves to the right, the number of nozzles of the fixed inner tube 205 on the left increases, so that the content of the sprayed solution increases.

[0039] Reference Figure 7 The cleaning component 5 includes a cleaning main rod 501, and the front of the cleaning main rod 501 is fixedly connected to the first pulley 502 and the cam body 503. The first pulley 502 is connected to the rotating component 4 through a belt 6. The cam component 8 is installed on the side of the cam body 503. The cam body 503 drives the vibration of the cam component 8. The back of the cleaning main rod 501 is fixedly connected to a cleaning frame 505. The cleaning frame 505 is composed of a circular frame. A blowing hole 506 is opened on the side of the circular frame. The circular frame is installed on the side of the ultraviolet lamp 7. The blowing hole 506 is connected to the air inlet 504. The gas enters the air inlet 504 to the blowing hole 506 to clean the catalytic plate module, while avoiding the formation of a film on the catalyst module due to the high moisture content in the exhaust gas, which affects the catalytic efficiency.

[0040] In this embodiment, it is necessary to specifically explain that: a catalyst module is attached to the inner wall of the photocatalytic chamber 109, and an arc-shaped replacement groove is opened on the back of the photocatalytic chamber 109. The catalyst module is a replaceable component, and the replacement method is to remove and install the upper and lower arc plates from the inside of the replacement groove on the back.

[0041] Reference Figure 8A circulation groove is provided on the plane of the cam body 503 where the photocatalytic chamber 109 is located, and a one-way valve groove 111 is provided on the side of the circulation groove. The one-way valve groove 111 is composed of a horizontal tube and a vertical tube. A placement groove 112 is provided inside the horizontal tube. A one-way valve and a phenol detector are installed inside the placement groove 112. The other end of the one-way valve groove 111 is connected to the air outlet 103. The one-way valve is used to allow part of the gas discharged from the air outlet 103 to enter the interior of the one-way valve groove 111 and enter the circulation groove under the action of the one-way valve. The phenol detector is used to detect the phenol content in the inhaled gas and monitor the phenol content in the exhaust gas.

[0042] In this embodiment, it should be specifically explained that an air intake pipe 110 is provided at the bottom of the photocatalytic chamber 109 , and the air intake pipe 110 is used to collect the attachments on the catalyst module blown up by the cleaning component 5 in the photocatalytic chamber 109 .

[0043] Working principle of the present invention:

[0044] The main problems solved by this embodiment are: using a combination of chemical absorption and photocatalysis to increase the range of phenol waste gas concentration treatment to adapt to the range of fifty to five thousand PPM, using the characteristics of chemical absorption and photocatalysis to achieve good treatment effects on both high and low concentrations, and at the same time using the change in flow rate to achieve self-adjustment of chemical absorption efficiency and automatic treatment of the catalyst module surface, solving the current problem of being unable to adjust the absorption efficiency when the flow rate changes, and solving the problem of reduced catalytic efficiency after long-term use.

[0045] The specific steps are as follows:

[0046] The gas enters the interior of the housing component 1 from the air inlet 102, and rotates into the venturi tube 2 under the guidance of the threaded plate 105. Under the action of the venturi tube 2, the gas is accelerated to pass through the right side of the tube body 201 and mixes with the sodium hydroxide solution sprayed by the fixed inner tube 205 to form soluble sodium phenolate, which quickly reduces the concentration of sodium phenolate in the exhaust gas to below 200 PPM. After the humidity is reduced by the corrugated demisting plate 3, the liquid is recovered and processed through the recovery tank 106. The dried gas enters the second venturi channel 108, and the speed is increased again to drive the rotating component 4 to rotate, and the rotating component 4 drives the cleaning component 5 to rotate. At the same time, the gas enters the photocatalytic chamber 109 along the two walls under the action of the venturi tube. Since the photocatalytic chamber 109 is equipped with an ultraviolet lamp 7 and the inner wall is attached with a catalyst module, the low-concentration exhaust gas is completely purified under the action of photocatalysis and discharged to the outside from the air outlet 103.

[0047] At the same time, the rotating component 4 drives the cleaning component 5 to rotate, and the cam body 503 causes the cam component 8 to reciprocate, so that part of the gas discharged from the outlet 103 enters the inside of the one-way valve groove 111 and enters the circulation groove under the action of the one-way valve. In this process, the phenol detector detects phenol on the discharged gas and monitors the phenol content of the discharged gas. At the same time, the gas enters the inside of the cleaning rack 505 from the air inlet 504 and is ejected from the air blowing hole 506 to blow and clean the surface of the catalyst module. Since the rotation of the cleaning component 5 is driven by the gas, the catalytic efficiency of the catalyst surface is always cleaned without contact, which remains relatively stable and greatly increases the service life. When the catalyst module needs to be replaced, the module can be taken out from the back for replacement without disassembling the device.

[0048] When the flow rate increases, the resistance of the movable baffle 203 increases, causing the movable inner tube 202 to move to the right, and the inner circular plate 2024 moves to the right inside the spraying chamber 2053. The liquid enters the left side of the spraying chamber 2053 from the liquid inlet groove 2054 and the solution circular groove 2052. As the movable long rod 2022 moves to the right, the number of nozzles of the left fixed inner tube 205 increases, which increases the content of the sprayed solution, making the spraying capacity positively correlated with the wind speed flow rate.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A phenol waste gas purification device, comprising a housing assembly (1), characterized in that: The housing assembly (1) comprises a housing body (101), the two ends of the housing body (101) are respectively an air inlet (102) and an air outlet (103), a first chamber (107) is provided inside the housing body (101), a venturi tube (2) is installed inside the first chamber (107), a solution tank (104) is provided at the top of the first chamber (107), and a recovery tank (106) is provided at the bottom, a corrugated demister plate (3) is installed on the right side of the first chamber (107), a second venturi channel (108) is provided on the right side of the corrugated demister plate (3), a rotating assembly (4) is installed above and below the second venturi channel (108), the rotating assembly (4) is connected to the cleaning assembly (5) via a belt (6), the cleaning assembly (5) is installed inside the photocatalytic chamber (109), an ultraviolet lamp (7) is installed at the center of the photocatalytic chamber (109), and a cam assembly (8) is installed on the side of the cleaning assembly (5); The cleaning assembly (5) comprises a cleaning main rod (501), the front of the cleaning main rod (501) being fixedly connected to a first pulley (502) and a cam body (503), the first pulley (502) being connected to a rotating assembly (4) via a belt (6), a cam assembly (8) being mounted on the side of the cam body (503), the cam body (503) driving the cam assembly (8) to vibrate, and a cleaning frame (505) being fixedly connected to the back of the cleaning main rod (501).

2. The device for purifying phenol waste gas according to claim 1, characterized in that: The venturi tube (2) comprises a tube body (201), a fixed inner tube (205) is fixedly connected to the interior of the tube body (201), a movable inner tube (202) is installed inside the fixed inner tube (205), one end of the movable inner tube (202) is installed inside the fixed inner tube (205), and the other end is fixedly connected to a movable baffle (203), a sliding rod (204) is hinged to the outer side of the movable baffle (203), and the other end of the sliding rod (204) is installed on the air inlet end of the tube body (201).

3. The device for purifying phenol waste gas according to claim 2, characterized in that: The movable inner tube (202) comprises a movable outer rod (2021) and a movable long rod (2022); an outer spring (2023) is sleeved on the outer side of the movable long rod (2022); one end of the movable long rod (2022) is fixedly connected to the interior of the movable outer rod (2021); and the other end is fixedly connected to the inner circular plate (2024); the fixed inner tube (205) comprises a fixed tube body (2051); a solution circular groove (2052) is provided inside the fixed tube body (2051) and is connected to a liquid inlet groove (2054); the liquid inlet groove (2054) is connected to a solution tank (104) at the top; the solution circular groove (2052) is connected to a spray chamber (2053); and a plurality of spray ports are provided on the outer side of the spray chamber (2053).

4. The device for purifying phenol waste gas according to claim 1, characterized in that: A catalyst module is attached to the inner wall of the photocatalytic cavity (109), an arc-shaped replacement groove is provided on the back of the photocatalytic cavity (109), and the catalyst module is a replaceable component.

5. The device for purifying phenol waste gas according to claim 1, characterized in that: A circulation groove is provided on the plane of the cam body (503) where the photocatalytic chamber (109) is located, and a one-way valve groove (111) is provided on the side of the circulation groove. The one-way valve groove (111) is composed of a horizontal tube and a vertical tube. A placement groove (112) is provided inside the horizontal tube. A one-way valve and a phenol detector are installed inside the placement groove (112). The other end of the one-way valve groove (111) is connected to the air outlet (103).

6. The device for purifying phenol waste gas according to claim 1, characterized in that: The cleaning frame (505) is composed of a circular frame, and a blowing hole (506) is opened on the side of the circular frame. The circular frame is installed on the side of the ultraviolet lamp (7), and the blowing hole (506) is communicated with the air inlet (504).

7. The device for purifying phenol waste gas according to claim 1, characterized in that: An air intake pipe (110) is provided at the bottom of the photocatalytic chamber (109), and the air intake pipe (110) is used to collect attachments on the catalyst module blown up by the cleaning component (5) in the photocatalytic chamber (109).

8. The device for purifying phenol waste gas according to claim 1, characterized in that: A porous ceramic humidity-regulating layer is installed on the side of the corrugated demisting plate (3); a buffer section is provided at the front end of the photocatalytic reaction stage, and a hydrophobic coating is lined on the inside.

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