A kiln exhaust gas treatment device

Abstract

This utility model relates to the field of kiln exhaust gas treatment technology, and in particular to a kiln exhaust gas treatment device, including a tank, an exhaust pipe installed on the top surface of the tank, a drain pipe installed on the bottom surface of the tank, a gas distributor installed at the lower part of the tank, a spraying mechanism installed above the gas distributor, and a demister installed in the upper part of the tank. The demister includes a baffle assembly and a vibration assembly. The baffle assembly includes a conical base plate; a support rod is arranged along the circumferential direction at the edge of the conical base plate; a baffle is fixedly installed at the upper end of the support rod; the baffle is located above the edge of the conical base plate; and the bottom end of the support rod is connected to the vibration assembly. Compared with the prior art, the conical base plate, support rod, and baffle structure of the baffle assembly in the demister can efficiently intercept water mist and particulate impurities in the exhaust gas by utilizing the airflow deflection principle, thereby improving the demisting effect.

Description

Technical Field

[0001] This utility model relates to the field of kiln exhaust gas treatment technology, and in particular to a kiln exhaust gas treatment device. Background Technology

[0002] In the process of producing aluminum hydroxide from alumina, the kiln exhaust gas has unique properties. Besides common water vapor, it also contains a certain amount of alkaline substances, such as ammonia, and tiny aluminum hydroxide particles. If this exhaust gas is released without proper treatment, it will not only pollute the atmosphere but may also cause scaling and corrosion problems in subsequent equipment, seriously affecting normal production.

[0003] Among existing kiln exhaust gas treatment devices, such as the industrial kiln exhaust gas treatment device disclosed in patent announcement number CN221611852U, there is an exhaust gas treatment tower. An exhaust pipe is fixedly installed on the top of the exhaust gas treatment tower, and an air inlet pipe is fixedly installed on the exhaust gas treatment tower. An incinerator is set on one side of the exhaust gas treatment tower, and an air pipe and an exhaust gas pipe are set on the incinerator. A conveying pipe is fixedly installed on the top surface of the incinerator, and the end of the conveying pipe is fixedly installed on the air inlet pipe. A uniform distribution cover is fixedly installed at the end of the air inlet pipe located inside the exhaust gas treatment tower. Multiple air outlet holes are set on the bottom wall of the uniform distribution cover. A spiral heat exchange tube is set inside the conveying pipe. A water inlet pipe is fixedly installed at the water inlet end of the spiral heat exchange tube, and a water outlet pipe is fixedly installed at the water outlet end of the spiral heat exchange tube. A spray assembly is set on the exhaust gas treatment tower.

[0004] In the above scheme, no demisting mechanism is installed above the spray pipes to further remove water mist containing alkaline substances from the exhaust gas, thereby reducing the need for subsequent processes and minimizing environmental pollution. Utility Model Content

[0005] To address the current issue that no demisting mechanism is installed above the spray pipes to further remove water mist containing alkaline substances from the exhaust gas, thereby reducing the need for subsequent processes and minimizing environmental pollution, this utility model provides a kiln exhaust gas treatment device.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: A kiln exhaust gas treatment device includes a tank, an exhaust pipe installed on the top surface of the tank, a drain pipe installed on the bottom surface of the tank, a gas distributor installed at the lower part of the tank, a spray mechanism installed above the gas distributor, and a demister installed in the upper part of the tank. The demister includes a baffle assembly and a vibration assembly. The baffle assembly includes a conical base plate. A support rod is arranged circumferentially along the edge of the conical base plate. A baffle is fixedly installed at the upper end of the support rod. The baffle is located above the edge of the conical base plate. The bottom end of the support rod is connected to the vibration assembly. The exhaust pipe, drain pipe, gas distributor, spray mechanism, and demister work together to effectively treat the exhaust gas. During operation, kiln exhaust gas enters the tank through a gas distributor, ensuring uniform gas flow through the spray mechanism. A catalyst is introduced into the spray mechanism to spray the exhaust gas. After spraying, the gas passes through a demister to remove mist before being discharged through the outlet pipe. Condensed water droplets are discharged through the drain pipe. In the demister, the conical base, support rods, and baffle structure of the baffle assembly utilize the principle of airflow deflection to efficiently intercept water mist and particulate impurities in the exhaust gas, improving the demisting effect. A vibration component connected to the support rod periodically vibrates the baffle assembly to prevent impurity accumulation, ensuring continuous and stable operation of the demister, extending equipment lifespan, improving the overall efficiency and stability of exhaust gas treatment, reducing the need for subsequent processes, and minimizing environmental pollution.

[0007] Preferably, the vibration assembly includes a spring; the spring is fixedly connected to the bottom surface of the support rod; the end of the spring away from the support rod is fixedly mounted on the mounting plate; the mounting plate is fixedly mounted on the inner wall of the tank; and a drive unit is connected to the baffle. The spring connects the support rod and the mounting plate. During operation, the spring absorbs and buffers vibrations caused by airflow impacts, reducing the swaying of the baffle assembly and ensuring its stable operation. Simultaneously, when cleaning and maintenance of the baffle assembly is required, the elasticity of the spring assists in vibration, making it easier for dust, water mist, and other impurities adhering to the baffle and other baffle components to fall off. The drive unit connected to the baffle drives the baffle to vibrate when there is a large accumulation of dust or when the airflow is weak and the baffle assembly vibrates little, enhancing the self-cleaning ability of the demister, effectively preventing the decrease in demister efficiency caused by impurity accumulation, ensuring the continuous and efficient operation of the demister, and improving the performance and stability of the entire kiln exhaust gas treatment device.

[0008] Preferably, a sleeve is provided on the top surface of the mounting plate; the lower end of the support rod and the spring are both housed within the sleeve. On one hand, the sleeve protects the spring and support rod, preventing them from being directly exposed to the kiln exhaust gas, reducing the corrosion of the spring and support rod by pollutants such as dust and sulfur oxides in the exhaust gas, extending their service life, and ensuring the stable operation of the vibration assembly. On the other hand, the sleeve guides the movement of the spring and support rod, ensuring that the support rod maintains a stable trajectory during vibration, preventing damage to the baffle assembly due to excessive swaying, thereby ensuring that the demister can stably and efficiently perform its demisting and dust removal functions, and improving the operational reliability of the entire kiln exhaust gas treatment device.

[0009] Preferably, the baffle is arranged in a circular ring shape; several through holes are provided along the edge of the conical base; and several through holes are located below the baffle. The circular ring shape of the baffle more effectively utilizes the principle of airflow deflection, causing water mist and dust impurities in the exhaust gas to collide and adhere to the bottom surface of the baffle, improving demisting and dust removal efficiency. The several through holes along the edge of the conical base, located below the baffle, allow the exhaust gas to pass through the through holes before being blocked by the baffle. The arrangement of the several through holes ensures smooth gas flow.

[0010] Preferably, the drive unit includes a rotating shaft; the rotating shaft is rotatably mounted on the side wall of the tank; a lever is radially fixed at the end of the rotating shaft; the end of the rotating shaft away from the lever passes through the side wall of the tank and is connected to a motor; the motor is fixedly mounted on the outer wall of the tank via a support; the lever can abut against the upper surface of the baffle. When the motor runs, it drives the lever to rotate with the rotating shaft, and the lever abuts against the upper surface of the baffle, controlling the vibration of the baffle. This helps to promptly shake off dust and other impurities adhering to the baffle, avoiding the impact of impurity accumulation on the demisting and dust removal efficiency. It can also enhance airflow turbulence to a certain extent, further improving the demister's ability to treat complex pollutants in the exhaust gas, ensuring the stable and efficient operation of the demister, and providing a reliable guarantee for kiln exhaust gas treatment.

[0011] Preferably, the gas distributor includes a main pipe; the main pipe passes through the tank and is connected to several branch pipes; the main pipe is L-shaped; the branch pipes are evenly distributed along the circumference on the side wall of one end of the main pipe; and each branch pipe has several air outlets on its bottom surface. The L-shaped main pipe passing through the tank and connecting to the branch pipes is compact and reasonable, facilitating installation and maintenance, and making full use of the tank space. The evenly distributed branch pipes along the circumference on the side wall of one end of the main pipe allow the incoming kiln exhaust gas to be evenly dispersed in the circumferential direction, achieving preliminary airflow distribution. The air outlets on the bottom surface of each branch pipe further refine the exhaust gas and evenly spray it upwards, ensuring that the exhaust gas fully contacts the liquid sprayed by the spraying mechanism at the bottom of the tank, greatly improving the gas-liquid reaction efficiency, enhancing the absorption and purification effect of various pollutants in the exhaust gas, laying a good foundation for subsequent demisting and dust removal processes, and effectively improving the overall operating efficiency of the kiln exhaust gas treatment device.

[0012] Preferably, the spraying mechanism includes staggered upper and lower coils; both the upper and lower coils are closed at one end and open at the other; the open ends of both the upper and lower coils penetrate the tank body and are connected to connecting pipes; a liquid inlet pipe is connected to the middle of the connecting pipe; and several nozzles are provided on the bottom surface of both the upper and lower coils. The staggered arrangement of the upper and lower coils greatly increases the spraying coverage, ensuring that the kiln exhaust gas rising from the gas distributor can fully and comprehensively contact the sprayed liquid, improving the absorption efficiency of pollutants in the exhaust gas. The structure of the upper and lower coils, closed at one end and open at the other and connected to the liquid inlet pipe via a connecting pipe, ensures stable and smooth liquid input, guaranteeing the continuity and uniformity of the spraying. The nozzles installed on the bottom surface of the upper and lower coils can refine the liquid into tiny droplets and spray them out, further increasing the gas-liquid contact area and enhancing the purification effect on pollutants such as dust and sulfur oxides in the exhaust gas. This creates favorable conditions for the effective operation of the subsequent demister and significantly improves the performance of the entire kiln exhaust gas treatment device.

[0013] Preferably, guide plates are fixedly installed on both the left and right sides of the outer wall of the lower coil. Water droplets condensed by the gas spraying mechanism are guided by the guide plates to both sides of the lower coil, preventing the condensed water droplets from flowing into the nozzle along the lower coil.

[0014] As can be seen from the above technical solution, the advantages of this utility model include: the coordinated operation of the gas outlet pipe, liquid drain pipe, gas distributor, spray mechanism, and demister effectively treats exhaust gas. During use, the kiln exhaust gas enters the tank through the gas distributor, ensuring uniform gas flow through the spray mechanism. A catalyst is introduced into the spray mechanism to spray the exhaust gas. After spraying, the gas passes through the demister to remove mist before being discharged through the gas outlet pipe. Condensed water droplets are discharged through the liquid drain pipe. In the demister, the conical base, support rod, and baffle structure of the baffle assembly can efficiently intercept water mist and particulate impurities in the exhaust gas using the airflow deflection principle, improving the demisting effect. The vibration component is connected to the support rod, allowing for periodic vibration of the baffle assembly to prevent impurity accumulation, ensuring continuous and stable operation of the demister, extending equipment lifespan, and improving the overall efficiency and stability of exhaust gas treatment. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3for Figure 2 Enlarged structural diagram at point A; Figure 4 This is a cross-sectional schematic diagram of the baffle assembly of this utility model; Figure 5 This is a schematic diagram of the structure of the gas distributor of this utility model; Figure 6 This is a schematic diagram of the spraying mechanism of this utility model; Figure 7 This is a top view of the spraying mechanism of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1-Tank body, 2-Gas outlet pipe, 3-Liquid drain pipe, 4-Gas distributor, 5-Spraying mechanism, 6-Demister; 401-Main pipe, 402-Branch pipe; 501-Upper coil, 502-Lower coil, 503-Connecting pipe, 504-Inlet pipe, 505-Guide plate; 601-Conical base, 602-Support rod, 603-Baffle, 604-Spring, 605-Mounting plate, 606-Through hole, 607-Shaft, 608-Lever, 609-Motor, 610-Support, 611-Sleeve. Detailed Implementation

[0018] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a kiln exhaust gas treatment device includes a tank 1, an exhaust pipe 2 installed on the top surface of the tank 1, a drain pipe 3 installed on the bottom surface of the tank 1, a gas distributor 4 installed at the lower part of the tank 1, a spraying mechanism 5 installed above the gas distributor 4, and a demister 6 installed in the upper part of the tank 1. The demister 6 includes a baffle assembly and a vibration assembly. The baffle assembly includes a conical base plate 601. A support rod 602 is arranged along the circumferential direction at the edge of the conical base plate 601. A baffle 603 is fixedly installed at the upper end of the support rod 602. The baffle 603 is located above the edge of the conical base plate 601. The bottom end of the support rod 602 is connected to the vibration assembly.

[0020] The exhaust pipe 2, drain pipe 3, gas distributor 4, spray mechanism 5, and demister 6 work together to effectively treat exhaust gas. During operation, kiln exhaust gas enters tank 1 through gas distributor 4, ensuring uniform gas flow through spray mechanism 5. A catalyst is introduced into spray mechanism 5 to spray the exhaust gas. After spraying, the gas passes through demister 6 to remove mist before being discharged through exhaust pipe 2. Condensed water droplets are discharged through drain pipe 3. In demister 6, the conical base 601, support rod 602, and baffle 603 of the baffle assembly utilize the airflow deflection principle to efficiently intercept water mist and particulate impurities in the exhaust gas, improving the demisting effect. The vibration component, connected to support rod 602, periodically vibrates the baffle assembly to prevent impurity accumulation, ensuring continuous and stable operation of demister 6, extending equipment lifespan, and improving the overall efficiency and stability of exhaust gas treatment.

[0021] In the above configuration, the vibration assembly includes a spring 604; the bottom surface of the support rod 602 is fixedly connected to the spring 604; the end of the spring 604 away from the support rod 602 is fixedly mounted on the mounting plate 605; the mounting plate 605 is fixedly mounted on the inner wall of the tank 1; and the baffle 603 is connected to a drive unit. The spring 604 connects the support rod 602 and the mounting plate 605. During operation, the spring 604 absorbs and buffers vibrations caused by airflow impacts, reducing the swaying of the baffle assembly and ensuring its stable operation. Simultaneously, when cleaning and maintenance of the baffle assembly is required, the elasticity of the spring 604 assists in vibration, making it easier for dust, water mist, and other impurities adhering to the baffle 603 and other baffle components to fall off. The drive unit connected to the baffle 603 drives the baffle 603 to vibrate when there is a large accumulation of dust or the airflow is weak and the baffle assembly vibrates less, enhancing the self-cleaning ability of the demister 6, effectively preventing the decrease in demister efficiency caused by impurity accumulation, ensuring the continuous and efficient operation of the demister 6, and improving the performance and stability of the entire kiln exhaust gas treatment device. A sleeve 611 is provided on the top surface of the mounting plate 605; the spring 604 and the support rod 602 are both housed within the sleeve 611. On one hand, the sleeve 611 protects the spring 604 and the support rod 602, preventing them from being directly exposed to the kiln exhaust gas, reducing the corrosion of the spring 604 and support rod 602 by pollutants such as dust and sulfur oxides in the exhaust gas, extending their service life, and ensuring the stable operation of the vibration assembly. On the other hand, the sleeve 611 guides the movement of the spring 604 and the support rod 602, ensuring that the support rod 602 maintains a stable trajectory during vibration, preventing damage to the baffle assembly due to excessive swaying, thereby ensuring that the demister 6 can stably and efficiently perform its demisting and dust removal functions, and improving the operational reliability of the entire kiln exhaust gas treatment device. The baffle 603 is generally arranged in a circular ring shape; several through holes 606 are provided along the edge of the conical base 601; several through holes 606 are located below the baffle 603. The baffle 603 is in the shape of a circular plate, which can more effectively utilize the principle of airflow deflection to cause water mist and dust and other impurities in the exhaust gas to collide and adhere to the bottom surface of the baffle 603, thereby improving the demisting and dust removal efficiency. Several through holes 606 are provided at the edge of the conical base 601 and are located below the baffle 603. The exhaust gas passes through the through holes 606 and is blocked by the baffle 603. The arrangement of several through holes 606 ensures smooth gas passage. The drive unit includes a rotating shaft 607; the rotating shaft 607 is rotatably mounted on the side wall of the tank 1; a lever 608 is fixedly mounted radially at the end of the rotating shaft 607; the end of the rotating shaft 607 away from the lever 608 passes through the side wall of the tank 1 and is connected to a motor 609; the motor 609 is fixedly mounted on the outer wall of the tank 1 through a support 610; the lever 608 can abut against the upper surface of the baffle 603. When the motor 609 is running, it drives the lever 608 to rotate with the shaft 607. The lever 608 abuts against the upper surface of the baffle 603, controlling the vibration of the baffle 603.This helps to promptly shake off dust and other impurities adhering to the baffle 603, preventing the accumulation of impurities from affecting the demisting and dust removal efficiency. It can also enhance airflow disturbance to a certain extent, further improving the ability of the demister 6 to handle complex pollutants in the exhaust gas, ensuring the stable and efficient operation of the demister, and providing a reliable guarantee for the treatment of kiln exhaust gas.

[0022] In other alternative embodiments, the motor 609, the shaft 607, and the lever 608 are replaced by a vibration motor, which is fixedly mounted on the upper surface of the baffle 603.

[0023] like Figure 5 As shown, the gas distributor 4 includes a main pipe 401; the main pipe 401 penetrates the tank body 1 and is connected to several branch pipes 402; the main pipe 401 is generally L-shaped; the several branch pipes 402 are evenly distributed along the circumference on the side wall of one end of the main pipe 401; each branch pipe 402 has several gas outlets on its bottom surface. The L-shaped main pipe 401 penetrating the tank body 1 and connecting to several branch pipes 402 has a compact and reasonable structure, is easy to install and maintain, and can make full use of the space in the tank body 1. The several branch pipes 402 are evenly distributed along the circumference on the side wall of one end of the main pipe 401, which allows the incoming kiln exhaust gas to be evenly dispersed in the circumferential direction, achieving preliminary airflow distribution. The numerous air outlets on the bottom surface of each branch pipe 402 further refine the exhaust gas and spray it upwards evenly, ensuring that the exhaust gas fully contacts the liquid sprayed by the spraying mechanism 5 at the bottom of the tank 1. This greatly improves the gas-liquid reaction efficiency, enhances the absorption and purification effect of various pollutants in the exhaust gas, lays a good foundation for subsequent demisting and dust removal processes, and effectively improves the operating efficiency of the entire kiln exhaust gas treatment device.

[0024] like Figure 6 and Figure 7As shown, the spraying mechanism 5 includes an upper coil 501 and a lower coil 502 arranged in a staggered manner. Both the upper coil 501 and the lower coil 502 have one closed end and the other open end. The open ends of both the upper coil 501 and the lower coil 502 pass through the tank body 1 and are connected to a connecting pipe 503. A liquid inlet pipe 504 is connected to the middle of the connecting pipe 503. Several nozzles are provided on the bottom surface of both the upper coil 501 and the lower coil 502. The staggered arrangement of the upper coil 501 and the lower coil 502 greatly increases the spray coverage area, ensuring that the kiln exhaust gas rising from the gas distributor 4 can fully and comprehensively contact the sprayed liquid, improving the absorption efficiency of pollutants in the exhaust gas. The upper coil 501 and the lower coil 502, with one closed end and one open end, are connected to the liquid inlet pipe 504 via the connecting pipe 503. This structure ensures stable and smooth liquid input, guaranteeing the continuity and uniformity of the spraying. The numerous nozzles installed on the bottom surfaces of the upper coil 501 and lower coil 502 can refine the liquid into tiny droplets, further increasing the gas-liquid contact area and enhancing the purification effect on pollutants such as dust and sulfur oxides in the exhaust gas. This creates favorable conditions for the effective operation of the subsequent demister and significantly improves the performance of the entire kiln exhaust gas treatment device. Guide plates 505 are fixedly installed on both the left and right sides of the outer wall of the lower coil 502. Water droplets condensed by the spray mechanism 5 are guided by the guide plates 505 to both sides of the lower coil 502, preventing the condensed water droplets from flowing into the nozzles along the lower coil 502.

[0025] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A kiln exhaust gas treatment device, comprising a tank (1), an exhaust pipe (2) installed on the top surface of the tank (1), a drain pipe (3) installed on the bottom surface of the tank (1), a gas distributor (4) installed at the lower part of the tank (1), and a spraying mechanism (5) installed above the gas distributor (4), characterized in that, A demister (6) is installed in the upper part of the tank body (1); the demister (6) includes a baffle assembly and a vibration assembly; the baffle assembly includes a conical base plate (601); a support rod (602) is provided along the circumferential direction at the edge of the conical base plate (601); a baffle (603) is fixedly provided at the upper end of the support rod (602); the baffle (603) is located above the edge of the conical base plate (601); the bottom end of the support rod (602) is connected to the vibration assembly.

2. The kiln off-gas treatment apparatus according to claim 1, characterized in that, The vibration assembly includes a spring (604); the bottom surface of the support rod (602) is fixedly connected to the spring (604); one end of the spring (604) away from the support rod (602) is fixedly mounted on the mounting plate (605); the mounting plate (605) is fixedly mounted on the inner wall of the tank (1); and the baffle (603) is connected to a drive unit.

3. The kiln off-gas treatment apparatus according to claim 2, characterized in that, A sleeve (611) is provided on the top surface of the mounting plate (605); the lower end of the support rod (602) and the spring (604) are both located inside the sleeve (611).

4. The kiln off-gas treatment apparatus according to claim 2, wherein The baffle (603) is arranged in a circular ring shape; several through holes (606) are provided at the edge of the conical base plate (601); several through holes (606) are provided below the baffle (603).

5. The kiln off-gas treatment apparatus as claimed in claim 2, wherein, The drive unit includes a rotating shaft (607); the rotating shaft (607) is rotatably mounted on the side wall of the tank (1); a lever (608) is fixedly mounted radially at the end of the rotating shaft (607); a motor (609) is connected to the end of the rotating shaft (607) away from the lever (608) after passing through the side wall of the tank (1); the motor (609) is fixedly mounted on the outer wall of the tank (1) through a support (610); the lever (608) can abut against the upper surface of the baffle (603).

6. The kiln tail gas treatment device according to claim 1, characterized in that, The gas distributor (4) includes a main pipe (401); the main pipe (401) passes through the tank (1) and is connected to several branch pipes (402); the main pipe (401) is arranged in an L-shape; several branch pipes (402) are evenly arranged on the side wall of one end of the main pipe (401) along the circumferential direction; several gas outlets are provided on the bottom surface of each branch pipe (402).

7. The kiln exhaust gas treatment device according to claim 1, characterized in that, The spraying mechanism (5) includes an upper coil (501) and a lower coil (502) arranged alternately; one end of the upper coil (501) and the lower coil (502) are both closed, and the other end is both open; the open ends of the upper coil (501) and the lower coil (502) pass through the tank (1) and are connected to a connecting pipe (503); the middle of the connecting pipe (503) is connected to an inlet pipe (504); several spray nozzles are provided on the bottom surface of the upper coil (501) and the lower coil (502).

8. The kiln off-gas treatment apparatus according to claim 7, characterized in that, Guide plates (505) are fixedly installed on both the left and right sides of the outer wall of the lower coil (502).

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