An exhaust gas treatment device and treatment method for the production of active zinc oxide

Abstract

The present invention belongs to the field of waste gas treatment, and specifically relates to a waste gas treatment device and method for the production of activated zinc oxide, including a treatment tank. A recovery hood is fixedly connected to the top of the treatment tank. A series pipe is arranged near the bottom inside the treatment tank. A plurality of gas spray pipes with downward output ends are fixedly connected to the middle of the series pipe. A liquid spray pipe is arranged below the gas spray pipe. The output ends of the liquid spray pipe and the gas spray pipe are arranged opposite to each other. A separation box communicated with the series pipe is arranged outside the treatment tank. A demisting baffle is installed above the inner side of the treatment tank. An appropriate amount of treatment liquid is filled in the treatment tank, and the height of the treatment liquid needs to exceed the height of the series pipe. Through this setting, the function of efficient waste gas treatment is realized, and at the same time, it is ensured that the waste gas in the treatment tank is always effectively treated at a constant flow rate, reducing the problems of insufficient waste gas treatment and rapid consumption of the treatment liquid.

Description

Technical Field

[0001] The present invention belongs to the field of waste gas treatment, and more specifically, it is an apparatus and method for treating waste gas generated during the production of activated zinc oxide. Background Art

[0002] Activated zinc oxide is a zinc oxide with special surface treatment, having a large specific surface area and high chemical activity. It usually appears as white or slightly yellow spherical fine powder and can be used as a vulcanization activator to improve the smoothness, abrasion resistance, mechanical strength and anti-aging performance of rubber products.

[0003] During the production process of activated zinc oxide, a large amount of waste gas is generated. The main pollutant in the waste gas is sulfur dioxide, which cannot be directly discharged and needs to be desulfurized by using a treatment device.

[0004] In traditional waste gas generated during the production of activated zinc oxide, generally sulfur dioxide needs to be treated, and the treatment method usually uses the spraying method, where the treatment liquid contacts the waste gas from top to bottom and from bottom to top to complete the removal of sulfur dioxide. However, during the contact process of the waste gas, it is difficult to fully contact with the treatment liquid, resulting in a general treatment effect. Moreover, during the treatment process of the waste gas, constant spraying needs to be maintained all the time, leading to a problem of excessive consumption of the treatment liquid.

[0005] Therefore, the present invention provides an apparatus and method for treating waste gas generated during the production of activated zinc oxide. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: An apparatus for treating waste gas generated during the production of activated zinc oxide according to the present invention includes a treatment tank. A recovery hood is fixedly connected to the top of the treatment tank. A series pipe is arranged at the bottom inside the treatment tank. A plurality of gas spray pipes with output ends facing downwards are fixedly connected to the middle of the series pipe. A liquid spray pipe is arranged below the gas spray pipes. The output ends of the liquid spray pipe and the gas spray pipes are arranged opposite to each other. A separation tank communicated with the series pipe is arranged outside the treatment tank. A demisting baffle is installed above the inner side of the treatment tank;

[0008] First, fill an appropriate amount of treatment liquid in the treatment tank. The height of the treatment liquid needs to exceed the height of the series pipes. Then, the waste gas is transferred equally to each air spray pipe through the series pipes. The air spray pipes spray the waste gas towards the bottom. At the same time, the corresponding liquid spray pipes also spray the treatment liquid upwards. The waste gas and the liquid collide and combine with each other. The treatment liquid can be a common desulfurizer: an aqueous solution of limestone. With the collision of the waste gas and the treatment liquid, the gas will be dispersed into fine bubbles and form a state similar to an emulsion after mixing with the treatment liquid. Sulfur dioxide in the waste gas will react with water first to form sulfurous acid. Then, sulfurous acid will react with limestone to produce calcium sulfite precipitate, carbon dioxide and water. The calcium sulfite precipitate can further react with oxygen to form a more stable calcium sulfate precipitate. Among them, oxygen is introduced into the treatment pipe together with the waste gas. The generated gas will move upwards in the liquid and finally be discharged from the top of the recovery hood. A negative pressure device for recovery needs to be connected above the recovery hood. The formed precipitate will accumulate at the bottom of the treatment tank. The precipitate and the liquid can be recovered regularly from the bottom. Since the by-products contain water, after the reaction continues for a period of time, the water content in the aqueous solution of limestone can be reduced and the water in the by-products can be used for the reaction. Through this setting, an efficient waste gas treatment function is achieved. However, during the production process of active zinc oxide, the amount of waste gas generated will change according to the progress of the reaction. If the same amount of treatment liquid is always used for treatment, it is easy to cause the rapid consumption of the treatment liquid when the amount of waste gas is small, or the problem of poor desulfurization effect of the waste gas when the amount of waste gas is high. By first introducing the waste gas into the separation box, the separation box can detect the emission content of the waste gas. When the emission is low, the waste gas is temporarily stored in the separation box. When a certain amount of waste gas has accumulated, the waste gas is introduced into the treatment tank at a certain speed. When the waste gas emission is large, the waste gas is controlled and adjusted to be introduced into the treatment tank at a constant speed to ensure the smooth and long-term progress of the waste gas treatment process.

[0009] Preferably, an exhaust pipe is installed at the bottom of one end of the separation box. The bottom of the separation box is inclined. The exhaust pipe is flat. A flow velocity measuring instrument is installed in the middle of the exhaust pipe. A circulation pipe is arranged outside the treatment tank. The circulation pipe is communicated with the series pipe. A first transfer pipe is connected between the exhaust pipe and the circulation pipe. A second transfer pipe is connected between the separation box and the circulation pipe. Air pumps are installed in both the first transfer pipe and the second transfer pipe. An air flow valve is arranged at the connection between the exhaust pipe and the separation box. When starting to introduce exhaust gas, the air flow valve is in a closed state. The exhaust gas is directly conveyed to the circulation pipe and the series pipe through the exhaust pipe and the first transfer pipe and sprayed out through the air spray pipe. When the flow velocity measuring instrument detects that the exhaust gas flow rate is large, the air flow valve is opened to allow part of the exhaust gas to enter the separation box. The air pump in the first transfer pipe is used to quantitatively transfer the exhaust gas to the air spray pipe to ensure the constant conveyance of the exhaust gas. When the flow velocity measuring instrument detects that the exhaust gas flow velocity is low, the first transfer pipe is closed to allow the exhaust gas to be first input into the separation box for storage. At the same time, the liquid spray pipe in the treatment tank stops working. According to the flow velocity detected by the flow velocity measuring instrument, the amount of exhaust gas accumulated in the separation box is roughly estimated. Then, the air pump in the second transfer pipe is started to convey the exhaust gas in the separation box to the air spray pipe at a constant speed. Through this setting, it is ensured that the exhaust gas in the treatment tank is always effectively treated at a constant flow rate, reducing the problems of insufficient exhaust gas treatment and rapid consumption of the treatment liquid. The inclined separation box allows the particulate matter in the exhaust gas to precipitate at the bottom under the action of gravity. A recovery door is arranged at the bottom of the separation box for cleaning the particulate matter, which can reduce the blockage of the pipeline by the particulate matter. The detection process of the flow velocity measuring instrument is to close the air pumps of the first transfer pipe and the second transfer pipe at the same time and measure only relying on the influx speed of the exhaust gas. The detection time is extremely short and will not affect the normal introduction of the exhaust gas.

[0010] Preferably, a plurality of filling pipes are installed near the lower part inside the treatment tank. The plurality of filling pipes are communicated with each other. The filling pipes are communicated with the liquid spray pipes. A transfer valve communicated with the filling pipes is arranged outside the treatment tank. The treatment liquid is connected to the outside through the transfer valve, and the treatment liquid is conveyed to the plurality of liquid spray pipes at a constant rate, so that the treatment liquid impacts and contacts the exhaust gas obliquely upward, dispersing the air flow into fine bubbles to ensure the full contact between the exhaust gas and the treatment liquid and the treatment effect of the exhaust gas.

[0011] Preferably, a rotatable connecting ring is provided above the series of pipes. A restraining ring is fixedly connected to the inner wall of the treatment tank. The connecting ring is clamped in the restraining ring. A plurality of vertical partition plates are fixedly connected to the middle of the connecting ring, and there are gaps between adjacent vertical partition plates. During the waste gas treatment process, the connecting ring rotates, thereby driving the plurality of vertical partition plates to rotate, stirring the accumulated treatment liquid. In this way, after the waste gas contacts the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the bubbles of the waste gas move upward, they will be impacted by the vertical partition plates, thus being broken into smaller bubbles, further ensuring the full mixing of the waste gas and the treatment liquid.

[0012] Preferably, a side pipe is fixedly connected between the transmission valve and the restraining ring. The side pipe is tangent to the restraining ring. There is a flow-through gap between the connecting ring and the restraining ring. The side pipe is communicated with the flow-through gap, and this flow-through gap is communicated with the filling pipe through the interlayer of the treatment tank. A plurality of annular wind-receiving plates are fixedly connected to the outer side of the connecting ring. The treatment liquid is transferred to the gap between the connecting ring and the restraining ring through the side pipe. With the arrangement of the wind-receiving plates, the flow of the treatment liquid will push the wind-receiving plates and the connecting ring to move. Finally, the treatment liquid enters the filling pipe through the interlayer of the treatment tank and is sprayed out through the liquid spray pipe. Through this setting, the high-speed rotation of the connecting ring is realized, and no additional electrical components need to be set.

[0013] Preferably, a plurality of hollow holes are opened in the middle of the vertical partition plates. A partition plate is arranged above the restraining ring. A plurality of detection valves are installed on the surface of the partition plate. A demisting baffle is arranged above the partition plate. When the vertical partition plates impact the waste gas bubbles, the bubbles will pass through the hollow holes. Since the aperture of the hollow holes is small, the water flow and the bubbles are under greater pressure when passing through. According to Bernoulli's theorem, the flow velocity here will become faster, and finally an effect similar to that of a Venturi tube will be formed, allowing the bubbles flowing through the hollow holes to be quickly released and decomposed into numerous small bubbles, further improving the contact effect between the waste gas and the treatment liquid. A plurality of air flow holes are opened on the surface of the partition plate to allow the air flow to pass through normally. At the same time, a water level detection module is provided. When the water level exceeds the partition plate, the discharge speed at the bottom is accelerated to ensure that the water level is below the partition plate. The demisting baffle reduces the liquid in the discharged air flow by contacting the air flow, reducing the solution content in the discharged air flow.

[0014] Preferably, a plurality of recovery pipes are fixedly connected to the bottom of the treatment tank. The ends of the plurality of recovery pipes extend to the outside of the treatment tank. A recovery valve is fixedly connected to the end of the recovery pipe. When the recovery valve is opened, the treatment liquid at the bottom will flow out along the recovery pipe, ensuring that the liquid level inside the treatment tank will not be too high and can also discharge the sediment at the bottom.

[0015] Preferably, the recovery pipe is arranged in an arc shape, and a baffle is fixedly connected to the inner bottom of the treatment tank. The baffle is located above the connection between the recovery pipe and the treatment tank. Under the rotation of the connection ring, the treatment liquid inside the treatment tank rotates, and the arc direction of the recovery pipe is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe under the action of gravity and inertia. When the recovery valve is opened, the sediment can be quickly discharged, reducing the problem of excessive sediment accumulation. The baffle is provided to assist the transfer of sediment into the recovery pipe.

[0016] This method is applicable to the above-mentioned waste gas treatment device for the production of active zinc oxide. Specifically, the method is as follows:

[0017] S1: First, fill an appropriate amount of treatment liquid in the treatment tank. The height of the treatment liquid needs to exceed the height of the series pipe. Then, the waste gas is equally transferred to each air spray pipe through the series pipe. The air spray pipe sprays the waste gas towards the bottom, and at the same time, the corresponding liquid spray pipe also sprays the treatment liquid upwards. The waste gas and the liquid collide and combine with each other.

[0018] S2: According to the flow velocity measured by the flow velocity measuring instrument, select an appropriate flow method to keep the waste gas being treated in the treatment tank at a constant flow rate. During the waste gas treatment process, the connection ring rotates, driving multiple vertical partitions to rotate, stirring the accumulated treatment liquid. In this way, after the waste gas comes into contact with the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the waste gas bubbles move upwards, they will be impacted by the vertical partitions, thus being crushed into smaller bubbles, further ensuring the full mixing of the waste gas and the treatment liquid.

[0019] S3: Under the rotation of the connection ring, the treatment liquid inside the treatment tank rotates, and the arc direction of the recovery pipe is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe under the action of gravity and inertia. When the recovery valve is opened, the sediment can be quickly discharged.

[0020] The method for the connection ring to rotate in S3 is as follows:

[0021] Q1: Connect to the external treatment liquid through the transfer valve, and deliver the treatment liquid to multiple liquid spray pipes at a constant rate. The treatment liquid is transferred to the gap between the connection ring and the restraint ring through the side pipe and discharged after one full circle.

[0022] Q2: In cooperation with the setting of the wind-receiving plate, the flow of the treatment liquid will push the connection ring to move. Finally, the treatment liquid enters the filling pipe through the interlayer of the treatment tank and is sprayed out through the liquid spray pipe. Through this setting, the high-speed rotation of the connection ring is realized, and no additional electrical components need to be set.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. An apparatus and method for treating waste gas in the production of active zinc oxide according to the present invention, through the arrangement of gas spray pipes and liquid spray pipes, first fill an appropriate amount of treatment liquid in the treatment tank, and the height of the treatment liquid needs to exceed the height of the series pipes. Then, the waste gas is equally transferred to each gas spray pipe through the series pipes, and the gas spray pipes spray the waste gas towards the bottom. At the same time, the corresponding liquid spray pipes also spray the treatment liquid upwards. The waste gas and the liquid collide and combine with each other. Through this arrangement, an efficient waste gas treatment function is achieved.

[0025] 2. An apparatus and method for treating waste gas in the production of active zinc oxide according to the present invention temporarily store the waste gas in a separation tank. When a certain amount of waste gas has accumulated, the waste gas is introduced into the treatment tank at a certain speed. When the waste gas emission is large, control and adjust the waste gas to still be introduced into the treatment tank at a constant speed, ensuring that the waste gas in the treatment tank is always effectively treated at a constant flow rate, reducing the problems of insufficient waste gas treatment and rapid consumption of the treatment liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 is a perspective view of the present invention;

[0028] Figure 2 is a cross-sectional view of the treatment tank of the present invention;

[0029] Figure 3 is a cross-sectional view of the restraint ring of the present invention;

[0030] Figure 4 is a perspective view of the series pipes of the present invention;

[0031] Figure 5 is a perspective view of the folding plate of the present invention;

[0032] Figure 6 is a perspective view of the separation tank of the present invention;

[0033] Figure 7 is a flowchart of the method of the present invention;

[0034] In the figure: 1, treatment tank; 2, recovery hood; 3, recovery pipe; 4, transmission valve; 5, circulation pipe; 6, recovery valve; 7, separation tank; 8, waste gas pipe; 9, transmission pipe 1; 10, transmission pipe 2; 11, demisting baffle; 12, partition board; 13, restraint ring; 15, filling pipe; 16, side pipe; 17, vertical partition board; 18, hollow hole; 19, connecting ring; 20, wind-receiving plate; 21, gas spray pipe; 22, series pipe; 23, liquid spray pipe; 24, folding plate; 25, flow velocity measuring instrument. DETAILED DESCRIPTION OF THE INVENTION

[0035] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0036] As Figures 1 to 6 shown, an exhaust gas treatment device for the production of activated zinc oxide according to an embodiment of the present invention includes a treatment tank 1, a recovery hood 2 is fixedly connected to the top of the treatment tank 1, a series pipe 22 is arranged near the bottom inside the treatment tank 1, a plurality of gas spray pipes 21 with downward output ends are fixedly connected to the middle of the series pipe 22, a liquid spray pipe 23 is arranged below the gas spray pipe 21, the output ends of the liquid spray pipe 23 and the gas spray pipe 21 are arranged opposite to each other, a separation tank 7 communicated with the series pipe 22 is arranged outside the treatment tank 1, and a demisting baffle 11 is installed above the inner side of the treatment tank 1;

[0037] First, an appropriate amount of treatment liquid is filled in the treatment tank 1, and the height of the treatment liquid needs to exceed the height of the series pipe 22. Then, the exhaust gas is equally transmitted to each gas spray pipe 21 through the series pipe 22, and the gas spray pipe 21 sprays the exhaust gas downward. At the same time, the corresponding liquid spray pipe 23 also sprays the treatment liquid upward, and the exhaust gas and the liquid collide and combine with each other; the treatment liquid can be a common desulfurizer: an aqueous solution of limestone; as the exhaust gas and the treatment liquid collide, the gas will be dispersed into fine bubbles and form a state similar to an emulsion after mixing with the treatment liquid. Sulfur dioxide in the exhaust gas will first react with water to form sulfurous acid, and then sulfurous acid will react with limestone to generate calcium sulfite precipitate, carbon dioxide and water. The calcium sulfite precipitate can further react with oxygen to generate a more stable calcium sulfate precipitate. Among them, oxygen is introduced into the treatment pipe 1 together with the exhaust gas. The generated gas will move upward in the liquid and finally be discharged from the top of the recovery hood 2. A negative pressure device for recovery needs to be connected above the recovery hood 2, and the formed precipitate will accumulate at the bottom of the treatment tank 1. The precipitate and the liquid can be recovered from the bottom regularly; since the by-product contains water, after the reaction continues for a period of time, the water content in the aqueous solution of limestone can be reduced, and the water of the by-product can be used for the reaction; through this setting, an efficient exhaust gas treatment function is realized; however, during the production process of activated zinc oxide, the amount of exhaust gas generated will change according to the progress of the reaction. If the same amount of treatment liquid is always used for treatment, it is easy to cause the rapid consumption of the treatment liquid when the amount of exhaust gas is small, or the poor desulfurization effect of the exhaust gas when the amount of exhaust gas is high. By first introducing the exhaust gas into the separation tank 7, the separation tank 7 can detect the emission content of the exhaust gas. When the emission is low, the exhaust gas is temporarily stored in the separation tank 7, and when the exhaust gas accumulates to a certain amount, the exhaust gas is introduced into the treatment tank 1 at a certain speed. When the exhaust gas emission is large, it is controlled and adjusted so that the exhaust gas still enters the treatment tank 1 at a constant speed to ensure the smooth and long-term progress of the exhaust gas treatment process.

[0038] At the bottom of one end of the separation box 7, an exhaust pipe 8 is installed. The bottom of the separation box 7 is inclined. The exhaust pipe 8 is flat. A flow rate measuring instrument 25 is installed in the middle of the exhaust pipe 8. A circulation pipe 5 is arranged outside the treatment tank 1. The circulation pipe 5 is communicated with a series pipe 22. A first transfer pipe 9 is connected between the exhaust pipe 8 and the circulation pipe 5. A second transfer pipe 10 is connected between the separation box 7 and the circulation pipe 5. Air pumps are installed in both the second transfer pipe 10 and the first transfer pipe 9;

[0039] During operation, an air flow valve is provided at the connection between the exhaust pipe 8 and the separation box 7. When starting to introduce waste gas, the air flow valve is in a closed state. The waste gas is directly transported to the circulation pipe 5 and the series pipe 22 through the exhaust pipe 8 and the first transfer pipe 9 and is ejected outward through the air spray pipe 21. When the flow rate measuring instrument 25 detects that the waste gas flow rate is large, the air flow valve is opened to allow part of the waste gas to enter the separation box 7. The air pump in the first transfer pipe 9 is used to quantitatively transfer the waste gas to the air spray pipe 21 to ensure the constant transportation of the waste gas; when the flow rate measuring instrument 25 detects that the waste gas flow rate is low, the first transfer pipe 9 is closed to allow the waste gas to be first input into the separation box 7 for storage. At the same time, the liquid spray pipe 23 in the treatment tank 1 stops working. According to the flow rate detected by the flow rate measuring instrument 25, the amount of waste gas accumulated in the separation box 7 is roughly estimated. Then, the air pump in the second transfer pipe 10 is started to transport the waste gas in the separation box 7 to the air spray pipe 21 at a constant speed. Through this setting, it is ensured that the waste gas in the treatment tank 1 is always effectively treated at a constant flow rate, reducing the problems of insufficient waste gas treatment and rapid consumption of the treatment liquid. The inclined separation box 7 allows the particulate matter in the waste gas to precipitate at the bottom under the action of gravity. A recovery door is provided at the bottom of the separation box 7 for cleaning the particulate matter, which can reduce the blockage of the pipeline by the particulate matter; the detection process of the flow rate measuring instrument 25 is to close the air pumps of the first transfer pipe 9 and the second transfer pipe 10 at the same time and measure only relying on the influx speed of the waste gas. The detection time is extremely short and will not affect the normal introduction of the waste gas.

[0040] A plurality of filling pipes 15 are installed inside the treatment tank 1 near the lower part. The plurality of filling pipes 15 are communicated with each other. The filling pipes 15 are communicated with the liquid spray pipes 23. A transfer valve 4 communicated with the filling pipes 15 is arranged outside the treatment tank 1;

[0041] During operation, the treatment liquid is connected to the outside through the transfer valve 4, and the treatment liquid is transported to the plurality of liquid spray pipes 23 at a constant rate, so that the treatment liquid impacts and contacts the waste gas obliquely upward, dispersing the air flow into fine bubbles to ensure the full contact between the waste gas and the treatment liquid and the treatment effect of the waste gas.

[0042] Above the series connection pipe 22, a rotatable connection ring 19 is provided. A restraint ring 13 is fixedly connected to the inner wall of the treatment tank 1. The connection ring 19 is clamped in the restraint ring 13. A plurality of vertical partition plates 17 are fixedly connected to the middle of the connection ring 19, and there are gaps between adjacent vertical partition plates 17;

[0043] During operation, in the process of waste gas treatment, the connection ring 19 rotates, thereby driving a plurality of vertical partition plates 17 to rotate, stirring the accumulated treatment liquid. In this way, after the waste gas contacts the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the bubbles of the waste gas move upward, they will be impacted by the vertical partition plates 17. When being impacted, the bubbles flow around the vertical partition plates 17, thereby applying a greater pressure to the bubbles, and thus crushing the bubbles into smaller bubbles, further ensuring the full mixing of the waste gas and the treatment liquid.

[0044] A side pipe 16 is fixedly connected between the transfer valve 4 and the restraint ring 13. The side pipe 16 is tangent to the restraint ring 13. There is a circulation gap between the connection ring 19 and the restraint ring 13. The side pipe 16 is communicated with the circulation gap, and this circulation gap is communicated with the filling pipe 15 through the interlayer of the treatment tank 1. A plurality of annular wind-receiving plates 20 are fixedly connected to the outside of the connection ring 19;

[0045] During operation, the treatment liquid is transferred to the gap between the connection ring 19 and the restraint ring 13 through the side pipe 16. With the setting of the wind-receiving plates 20, the flow of the treatment liquid will push the wind-receiving plates 20 and the connection ring 19 to move. Finally, the treatment liquid enters the filling pipe 15 through the interlayer of the treatment tank 1 and is sprayed outward through the liquid spray pipe 23. Through this setting, the high-speed rotation of the connection ring 19 is realized, and no additional electrical components need to be set.

[0046] A plurality of hollow holes 18 are opened in the middle of the vertical partition plates 17. A partition plate 12 is provided above the restraint ring 13. A plurality of detection valves are installed on the surface of the partition plate 12. A demisting baffle 11 is provided above the partition plate 12;

[0047] During operation, when the vertical partition plates 17 impact the waste gas bubbles, the bubbles will pass through the hollow holes 18. Since the aperture of the hollow holes 18 is small, the pressure received by the water flow and the bubbles when passing through is large. According to Bernoulli's theorem, the flow velocity here will become faster, and finally an effect similar to that of a Venturi tube will be formed, allowing the bubbles flowing through the hollow holes 18 to be quickly released, decomposing into many small bubbles, further improving the contact effect between the waste gas and the treatment liquid. A plurality of air flow holes are opened on the surface of the partition plate 12 to allow the air flow to pass through normally. At the same time, a water level detection module is provided. When the water level exceeds the partition plate 12, the discharge speed at the bottom is accelerated to ensure that the water level is below the partition plate 12. The demisting baffle 11 reduces the liquid in the discharged air flow by contacting the air flow, reducing the solution content in the discharged air flow.

[0048] A plurality of recovery pipes 3 are fixedly connected to the bottom of the treatment tank 1, and the ends of the plurality of recovery pipes 3 extend to the outside of the treatment tank 1. A recovery valve 6 is fixedly connected to the end of the recovery pipe 3;

[0049] During operation, when the recovery valve 6 is opened, the treatment liquid at the bottom will drain out along the recovery pipe 3, ensuring that the liquid level inside the treatment tank 1 will not be too high and can also discharge the sediment at the bottom.

[0050] The recovery pipe 3 is arranged in an arc shape, and a folding plate 24 is fixedly connected to the inner bottom of the treatment tank 1. The folding plate 24 is located above the connection between the recovery pipe 3 and the treatment tank 1;

[0051] During operation, under the rotation of the connecting ring 19, the treatment liquid inside the treatment tank 1 rotates. The arc direction of the recovery pipe 3 is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe 3 under the action of gravity and inertia. In this way, when the recovery valve 6 is opened, the sediment can be quickly discharged, reducing the problem of excessive sediment accumulation. The setting of the folding plate 24 is to assist the transfer of sediment to the recovery pipe 3.

[0052] A method for treating waste gas in the production of active zinc oxide, which is applicable to the above-mentioned waste gas treatment device for the production of active zinc oxide. The specific method is as follows:

[0053] S1: First, fill an appropriate amount of treatment liquid in the treatment tank 1. The height of the treatment liquid needs to exceed the height of the series pipe 22. Then, the waste gas is equally transferred to each air spray pipe 21 through the series pipe 22. The air spray pipe 21 sprays the waste gas towards the bottom. At the same time, the corresponding liquid spray pipe 23 also sprays the treatment liquid upwards. The waste gas and the liquid collide and combine with each other;

[0054] S2: According to the flow rate measured by the flow rate measuring instrument 25, select an appropriate flow method to keep the waste gas being treated in the treatment tank 1 at a constant flow rate. During the waste gas treatment process, the connecting ring 19 rotates, driving a plurality of vertical partition plates 17 to rotate, stirring the accumulated treatment liquid. In this way, after the waste gas contacts the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the bubbles of the waste gas move upwards, they will be impacted by the vertical partition plates 17, thereby being crushed into smaller bubbles, further ensuring the full mixing of the waste gas and the treatment liquid;

[0055] S3: Under the rotation of the connecting ring 19, the treatment liquid inside the treatment tank 1 rotates. The arc direction of the recovery pipe 3 is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe 3 under the action of gravity and inertia. In this way, when the recovery valve 6 is opened, the sediment can be quickly discharged.

[0056] The method for the connecting ring 19 to rotate in S2 is as follows:

[0057] Q1: The treatment liquid connected to the outside through the transfer valve 4 is conveyed to a plurality of liquid nozzles 23 at a constant rate. The treatment liquid is transferred through the side pipe 16 to the gap between the connecting ring 19 and the binding ring 13, and is discharged after surrounding a circle.

[0058] Q2: With the setting of the wind-receiving plate 20, the flow of the treatment liquid will push the connecting ring 19 to move. Finally, the treatment liquid enters the filling pipe 15 through the interlayer of the treatment tank 1 and is ejected outward through the liquid nozzle 23. Through this setting, the high-speed rotation of the connecting ring 19 is realized, and no additional electrical components need to be set.

[0059] During operation, an appropriate amount of treatment liquid is first filled in the treatment tank 1, and the height of the treatment liquid needs to exceed the height of the series pipe 22. Then, the waste gas is equally transferred to each gas nozzle 21 through the series pipe 22, and the gas nozzle 21 ejects the waste gas toward the bottom. At the same time, the corresponding liquid nozzle 23 also ejects the treatment liquid upward, and the waste gas and the liquid collide and combine with each other. The treatment liquid can be a common desulfurizer: an aqueous solution of limestone. With the collision of the waste gas and the treatment liquid, the gas will be dispersed into fine bubbles and form a state similar to an emulsion after mixing with the treatment liquid. Sulfur dioxide in the waste gas will first react with water to form sulfurous acid, and then sulfurous acid will react with limestone to form calcium sulfite precipitate, carbon dioxide and water. Calcium sulfite precipitate can further react with oxygen to form a more stable calcium sulfate precipitate. Among them, oxygen is introduced into the treatment pipe 1 together with the waste gas. The generated gas will move upward in the liquid and finally be discharged from the top of the recovery hood 2. A negative pressure device for recovery needs to be connected above the recovery hood 2, and the formed precipitate will accumulate at the bottom of the treatment tank 1. The precipitate and the liquid can be recovered from the bottom regularly. Since the by-product contains water, after the reaction continues for a period of time, the water content in the aqueous solution of limestone can be reduced, and the water of the by-product can be used for the reaction. Through this setting, the function of efficient waste gas treatment is realized. However, during the production process of active zinc oxide, the amount of waste gas generated will change according to the progress of the reaction. If the same amount of treatment liquid is always used for treatment, it is easy to cause the rapid consumption of the treatment liquid when the amount of waste gas is small, or the poor desulfurization effect of the waste gas when the amount of waste gas is high. By first introducing the waste gas into the separation box 7, the separation box 7 can detect the emission content of the waste gas. When the emission is low, the waste gas is temporarily stored in the separation box 7. When a certain amount of waste gas has accumulated, the waste gas is introduced into the treatment tank 1 at a certain speed. When the waste gas emission is large, it is controlled and adjusted so that the waste gas still enters the treatment tank 1 at a constant speed to ensure the smooth and long-term progress of the waste gas treatment process.

[0060] An air flow valve is provided at the connection between the exhaust gas pipe 8 and the separation box 7. When the exhaust gas starts to be introduced, the air flow valve is in the closed state. The exhaust gas is directly transported to the circulation pipe 5 and the series pipe 22 through the exhaust gas pipe 8 and the first transfer pipe 9, and is ejected outward through the air spraying pipe 21. When the flow rate measuring instrument 25 detects that the exhaust gas flow rate is large, the air flow valve is opened to allow some exhaust gas to enter the separation box 7. The air pump in the first transfer pipe 9 is used to quantitatively transfer the exhaust gas to the air spraying pipe 21 to ensure the constant transportation of the exhaust gas. When the flow rate measuring instrument 25 detects that the exhaust gas flow rate is low, the first transfer pipe 9 is closed to allow the exhaust gas to be first stored in the separation box 7. At the same time, the liquid spraying pipe 23 in the treatment tank 1 stops working. According to the flow rate detected by the flow rate measuring instrument 25, the amount of exhaust gas accumulated in the separation box 7 is roughly estimated. Then, the air pump in the second transfer pipe 10 is started to transport the exhaust gas in the separation box 7 to the air spraying pipe 21 at a constant speed. Through this setting, it is ensured that the exhaust gas in the treatment tank 1 is always effectively treated at a constant flow rate, reducing the problems of insufficient exhaust gas treatment and rapid consumption of the treatment liquid. The separation box 7 is inclined, so that the particulate matter in the exhaust gas can settle at the bottom under the action of gravity. A recovery door is provided at the bottom of the separation box 7 for cleaning the particulate matter, which can reduce the blockage of the pipeline by the particulate matter. The detection process of the flow rate measuring instrument 25 is to close the air pumps of the first transfer pipe 9 and the second transfer pipe 10 at the same time, and measure only relying on the influx speed of the exhaust gas. The detection time is extremely short and will not affect the normal introduction of the exhaust gas;

[0061] The treatment liquid is connected to the outside through the transfer valve 4, and the treatment liquid is transported to the multiple liquid spraying pipes 23 at a constant rate, so that the treatment liquid impacts and contacts the exhaust gas obliquely upward, dispersing the air flow into fine bubbles to ensure the full contact between the exhaust gas and the treatment liquid and the treatment effect of the exhaust gas;

[0062] During the exhaust gas treatment process, the connecting ring 19 rotates, thereby driving the multiple vertical partitions 17 to rotate, stirring the accumulated treatment liquid. In this way, after the exhaust gas contacts the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the bubbles of the exhaust gas move upward, they will be impacted by the vertical partitions 17, thus being crushed into smaller bubbles, further ensuring the full mixing of the exhaust gas and the treatment liquid;

[0063] The treatment liquid is transferred to the gap between the connecting ring 19 and the restraint ring 13 through the side pipe 16. With the setting of the wind receiving plate 20, the flow of the treatment liquid will push the wind receiving plate 20 and the connecting ring 19 to move. Finally, the treatment liquid enters the filling pipe 15 through the sandwich layer of the treatment tank 1 and is sprayed outward through the liquid spraying pipe 23. Through this setting, the high-speed rotation of the connecting ring 19 is realized, and no additional electrical components need to be set;

[0064] When the vertical partition plate 17 impacts the impact waste gas bubbles, the bubbles will pass through the hollow holes 18. Since the aperture of the hollow holes 18 is relatively small, the water flow and bubbles will be under greater pressure when passing through. According to Bernoulli's theorem, the flow velocity here will become faster, and finally an effect similar to that of a Venturi tube will be formed, enabling the bubbles flowing through the hollow holes 18 to be quickly released, decomposing into numerous small bubbles, further improving the contact effect between the waste gas and the treatment liquid. The surface of the partition plate 12 is provided with a plurality of air flow holes to allow the air flow to pass through normally. At the same time, a water level detection module is provided. When the water level exceeds the partition plate 12, the discharge speed at the bottom is accelerated to ensure that the water level is below the partition plate 12. The demisting baffle 11 reduces the liquid in the discharged air flow and the solution content in the discharged air flow by contacting the air flow;

[0065] When the recovery valve 6 is opened, the treatment liquid at the bottom will flow out along the recovery pipe 3, ensuring that the liquid level inside the treatment tank 1 will not be too high and can also discharge the sediment at the bottom;

[0066] Under the rotation of the connecting ring 19, the treatment liquid inside the treatment tank 1 rotates. The curvature direction of the recovery pipe 3 is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe 3 under the action of gravity and inertia. In this way, when the recovery valve 6 is opened, the sediment can be quickly discharged, reducing the problem of excessive sediment accumulation. The setting of the baffle 24 is to assist the transfer of the sediment to the recovery pipe 3.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas treatment device for the production of activated zinc oxide, characterized in that: It includes a processing tank, a recovery hood is fixedly connected to the top of the processing tank, a series pipe is arranged near the bottom inside the processing tank, a plurality of air spray pipes with output ends facing downwards are fixedly connected to the middle of the series pipe, a liquid spray pipe is arranged below the air spray pipe, the output ends of the liquid spray pipe and the air spray pipe are arranged oppositely, a separation tank communicated with the series pipe is arranged outside the processing tank, and a demisting baffle is installed above the inner side of the processing tank; A rotatable connecting ring is arranged above the series pipe, a restraint ring is fixedly connected to the inner wall of the processing tank, the connecting ring is clamped in the restraint ring, a plurality of vertical partition plates are fixedly connected to the middle of the connecting ring, and there are gaps between adjacent vertical partition plates; A plurality of filling pipes are installed near the lower part inside the processing tank, the plurality of filling pipes are communicated with each other, the filling pipes are communicated with the liquid spray pipe, and a transmission valve communicated with the filling pipe is arranged outside the processing tank; A side pipe is fixedly connected between the transmission valve and the restraint ring, the side pipe is tangent to the restraint ring, there is a flow-through gap between the connecting ring and the restraint ring, the side pipe is communicated with the flow-through gap, and the flow-through gap is communicated with the filling pipe through the interlayer of the processing tank, and a plurality of annular wind-receiving plates are fixedly connected to the outside of the connecting ring; A plurality of recovery pipes are fixedly connected to the bottom of the processing tank, the ends of the plurality of recovery pipes extend to the outside of the processing tank, and recovery valves are fixedly connected to the ends of the recovery pipes; The recovery pipes are arranged in an arc shape, a folding plate is fixedly connected to the inner bottom of the processing tank, and the folding plate is located above the connection between the recovery pipe and the processing tank; under the rotation of the connecting ring, the processing liquid inside the processing tank rotates, and the arc direction of the recovery pipe is the same as the rotation direction.

2. The waste gas treatment device for the production of activated zinc oxide according to claim 1, wherein: An exhaust pipe is installed at the bottom of one end of the separation tank, the bottom of the separation tank is inclined, the exhaust pipe is arranged in a flat shape, a flow velocity measuring instrument is installed in the middle of the exhaust pipe, a circulation pipe is arranged outside the processing tank, the circulation pipe is communicated with the series pipe, a transmission pipe I is connected between the exhaust pipe and the circulation pipe, and a transmission pipe II is connected between the separation tank and the circulation pipe, and air pumps are installed in both the transmission pipe II and the transmission pipe I.

3. The waste gas treatment device for the production of activated zinc oxide according to claim 2, characterized in that: A plurality of hollow holes are opened in the middle of the vertical partition plate, a partition plate is arranged above the restraint ring, a plurality of detection valves are installed on the surface of the partition plate, and a demisting baffle is arranged above the partition plate.

4. A method for treating waste gas from the production of activated zinc oxide, characterized in that: This method is applicable to an active zinc oxide production waste gas treatment device described in claim 3 above. The method is specifically as follows: S1: First, fill an appropriate amount of processing liquid in the processing tank, and the height of the processing liquid needs to exceed the height of the series pipe. Then, the waste gas is equally transmitted to each air spray pipe through the series pipe, and the air spray pipe sprays the waste gas towards the bottom. At the same time, the corresponding liquid spray pipe also sprays the processing liquid upwards, and the waste gas and the liquid collide and combine with each other; S2: According to the flow velocity of the flow velocity measuring instrument, select an appropriate flow method to continuously process the waste gas in the treatment tank at a constant flow rate. During the waste gas treatment process, the connecting ring rotates, driving multiple vertical partitions to rotate, stirring the accumulated treatment liquid. In this way, after the waste gas comes into contact with the sprayed treatment liquid, it can also be fully mixed with the accumulated treatment liquid. At the same time, when the bubbles of the waste gas move upward, they will be impacted by the vertical partitions, thus being broken into smaller bubbles, further ensuring the full mixing of the waste gas and the treatment liquid; S3: Under the rotation of the connecting ring, the treatment liquid inside the treatment tank rotates. The arc direction of the recovery pipe is the same as the rotation direction. In this way, the generated sediment will gradually gather in the recovery pipe under the action of gravity and inertia. In this way, when the recovery valve is opened, the sediment can be quickly discharged.

5. A method for treating waste gas from the production of activated zinc oxide according to claim 4, characterized in that: The method for the connecting ring to rotate in S2 is as follows: Q1: Connect the external treatment liquid through the transfer valve, and deliver the treatment liquid to multiple liquid spray pipes at a constant rate. The treatment liquid is transferred to the gap between the connecting ring and the restraint ring through the side pipe and discharged after a full circle; Q2: In cooperation with the setting of the wind receiving plate, the flow of the treatment liquid will push the connecting ring to move. Finally, the treatment liquid enters the filling pipe through the sandwich layer of the treatment tank and is sprayed outward through the liquid spray pipe. Through this setting, the high-speed rotation of the connecting ring is realized, and no additional electrical components need to be set.

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