Tunnel kiln tail gas purification structure

Abstract

The utility model relates to tunnel kiln tail gas purification technical field, proposes a kind of tunnel kiln tail gas purification structure, including separation mechanism, and the desulfurization mechanism is fixedly installed in separation mechanism side, and the adsorption mechanism is fixedly installed in the side of desulfurization mechanism, and separation mechanism includes cylinder, and the lower end of cylinder is fixedly installed with cone, and the outer wall of cylinder is fixedly installed with air inlet pipe, and the upper end of cylinder is fixedly installed with air outlet pipe, and the lower end of cone is fixedly installed with hopper, after gas enters cylinder and cone, again its inside forms a airflow rotating around separation mechanism axis, in the rotation process, solid particles in gas are thrown to the inner wall of separation mechanism by centrifugal force, finally fall into hopper in the bottom of separation mechanism, after separation, purification gas is reversed in the bottom of separation mechanism, and is discharged from the air outlet pipe in the top of separation mechanism, improve the dust removal efficiency of device, increase the purification integrity of subsequent step.

Description

Technical Field

[0001] This utility model relates to the field of tunnel kiln tail gas purification technology, and in particular to a tunnel kiln tail gas purification structure. Background Technology

[0002] Tunnel kilns, as modern continuous firing thermal equipment, are widely used in many industrial fields, such as ceramics, refractory materials, and brick and tile manufacturing. During operation, they generate a large amount of exhaust gas, which is complex in composition and contains various pollutants harmful to the environment and human health. In the brick and tile manufacturing industry, for example, the monitoring report (Jinghuanjianzi (2024) No. 065) dated May 16, 2024, from Jingmen Chenxiong Shale Brick Factory showed that the SO2 concentration at the tunnel kiln exhaust outlet reached 2085 mg / m³. 3 NOx concentration was 303 mg / m³ 3 The particulate matter concentration was 779.2 mg / m³. 3 These emissions exceeded the emission concentration limits in Table 2 of the "Emission Standard of Air Pollutants for Brick and Tile Industry" (GB29620-2013) by 12.9 times, 0.52 times, and 25 times, respectively. This phenomenon of exceeding the emission standards is not an isolated case, reflecting the urgency of purifying the exhaust gas of tunnel kilns.

[0003] A Chinese patent with publication number CN 211612239 U discloses a secondary roasting tunnel kiln exhaust gas purification device. When treating the exhaust gas, the exhaust gas enters the dust collector through the air inlet pipe, and the dust collector is sprayed through the dust settling water pipe to achieve the settling of the gas in the exhaust gas.

[0004] Regarding the aforementioned technologies, for some exhaust gases with small particle size, high temperature, and high concentration of dust, simple spraying and settling may not achieve the ideal dust removal effect, leading to a decrease in the efficiency of subsequent desulfurization and denitrification, while also causing some fine particles to be discharged with the exhaust gas, affecting the purification quality. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes a tunnel kiln tail gas purification structure to solve the problem that for some tail gas with small particle size, high temperature and high concentration of dust, simple spraying and settling may not achieve the ideal dust removal effect, resulting in a decrease in the efficiency of subsequent desulfurization and denitrification, and at the same time causing some fine particles to be discharged with the tail gas.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a tunnel kiln tail gas purification structure, including a separation mechanism, a desulfurization mechanism fixedly installed on one side of the separation mechanism, and an adsorption mechanism fixedly installed on one side of the desulfurization mechanism. The separation mechanism includes a cylindrical body, a cone fixedly installed at the lower end of the cylindrical body, an air inlet pipe fixedly installed on the outer wall of the cylindrical body, the air inlet pipe being fixedly connected to an air guide device, an air outlet pipe penetrating through the upper end of the cylindrical body, and both the air inlet pipe and the air outlet pipe communicating with the interior of the cylindrical body. An ash hopper is fixedly installed at the lower end of the cone, and a collection box is fixedly installed at the lower end of the ash hopper. When it is necessary to purify the tunnel kiln tail gas, the air guide device is connected to the air inlet pipe. When large particles are removed from the interior of the cylindrical body and the cone, the gas forms an airflow rotating around the axis of the separation mechanism inside the cylindrical body and the cone. This rotating airflow spirals from top to bottom within the separation mechanism. The gas moves, forming an external swirling flow. During the rotation, solid particles or droplets in the gas, due to their larger mass, are thrown towards the inner wall of the separation mechanism by centrifugal force, while the gas, due to its smaller mass, continues to rotate along the spiral path towards the bottom of the separation mechanism. The particles thrown to the inner wall slide downwards along the inner wall under the combined action of gravity and airflow, eventually falling into the ash hopper at the bottom of the separation mechanism. The purified gas after separation reverses at the bottom of the separation mechanism, forming an internal swirling flow from bottom to top, and is discharged from the exhaust pipe at the top of the separation mechanism. It has a high separation efficiency for larger dust particles, and can quickly and effectively remove most of the dust in the exhaust gas, reducing the burden on subsequent purification equipment. At the same time, it can be designed and selected according to parameters such as exhaust gas flow rate and dust concentration, and can adapt to the exhaust gas treatment needs of different working conditions. It can also play a good role in some high-temperature, high-concentration dust exhaust gases.

[0007] Preferably, the ash hopper includes a connecting shell, a funnel shell is fixedly installed at the lower end of the connecting shell, a vortex hood is fixedly installed at the upper end of the connecting shell, a connecting frame is fixedly installed inside the vortex hood, and a rotating fan blade is rotatably installed at the upper end of the connecting frame. Under the combined action of gravity and airflow, the particles on the inner wall slide down the inner wall and finally fall into the funnel shell at the bottom of the separation mechanism. The rotating fan blade inside the vortex hood rotates under the action of wind force to prevent dust from flying out of the funnel shell and affecting the separation efficiency.

[0008] Preferably, the collection box includes a shell with a round hole at the upper end, which is connected to the funnel shell. A cleaning box is slidably installed inside the shell. Dust falling into the funnel shell falls into the cleaning box through the round hole under the action of gravity for unified collection and cleaning.

[0009] Preferably, two sets of support frames are fixedly installed on the outer side of the cone. The lower ends of the two sets of support frames are fixedly connected to the shell. The support frames support and fix the cylinder and the cone to prevent the risk of tilting and collapse.

[0010] Preferably, the desulfurization mechanism includes a desulfurization tower, a pump fixedly installed at the upper end of the desulfurization tower, connecting pipes fixedly installed at both ends of the pump, one end of the connecting pipe being connected to the lower end of the desulfurization tower, a spray mechanism fixedly installed at the pump output end, the desulfurization tower being fixedly connected to the air outlet pipe by bolts, a drain valve being opened at the lower end of the side of the desulfurization tower away from the air outlet pipe, and an exhaust valve being opened in the middle of the side of the desulfurization tower away from the air outlet pipe, the exhaust valve being connected to the adsorption mechanism. After large particle dust removal, the exhaust gas flows into the desulfurization tower through the air outlet pipe. By starting the pump, the alkaline solution reacts with the sulfur dioxide in the air through the spray mechanism to desulfurize it. The desulfurized air flows into the adsorption mechanism through the exhaust valve for denitrification adsorption treatment. During the desulfurization process, the pump reuses the alkaline solution through the connecting pipe to improve resource utilization.

[0011] Preferably, the adsorption mechanism includes a purification box, with an adsorption box fixedly installed on one side of the purification box. The lower ends of the purification box and the adsorption box are connected through an exhaust pipe. An exhaust pipe is installed through the upper end of the adsorption box. The air that has undergone desulfurization treatment flows into the purification box through the exhaust valve for denitrification treatment. Under the action of a catalyst, nitrogen oxides are reduced to nitrogen and water using reducing agents such as ammonia. The exhaust gas after denitrification treatment is adsorbed through the exhaust pipe at the lower end of the adsorption box to adsorb residual organic pollutants, odor substances, and some trace harmful gases that are difficult to remove, thereby improving the quality of exhaust gas purification. Finally, it is discharged through the exhaust pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This utility model proposes a tunnel kiln tail gas purification structure. When the tail gas of the tunnel kiln needs to be purified, it is connected to the air inlet pipe through an air guide device. When removing large particles of dust inside the cylindrical and conical bodies, the gas forms an airflow rotating around the axis of the separation mechanism inside the cylindrical and conical bodies. This rotating airflow moves spirally from top to bottom within the separation mechanism, forming an external vortex. During the rotation, solid particles or droplets in the gas, due to their larger mass, are thrown towards the inner wall of the separation mechanism by centrifugal force, while the gas, due to its smaller mass, continues to rotate along the spiral path towards the bottom of the separation mechanism and is thrown towards the inner wall. Under the combined action of gravity and airflow, the particles on the inner wall slide downwards along the inner wall and eventually fall into the ash hopper at the bottom of the separation mechanism. The purified gas after separation reverses at the bottom of the separation mechanism, forming an upward internal vortex flow, and is discharged from the air outlet pipe at the top of the separation mechanism. It has a high separation efficiency for larger dust particles, and can quickly and effectively remove most of the dust in the exhaust gas, reducing the burden on subsequent purification equipment. At the same time, it can be designed and selected according to parameters such as exhaust gas flow rate and dust concentration, and can adapt to the exhaust gas treatment needs of different working conditions. It can also play a good role in exhaust gases with high temperature and high concentration of dust. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0015] Figure 1 The schematic diagram illustrates the overall structure according to one embodiment of the present invention. Figure 1 ;

[0016] Figure 2 The schematic diagram illustrates the overall structure according to one embodiment of the present invention. Figure 2 ;

[0017] Figure 3 The schematic diagram shows a three-dimensional structural diagram of a separation mechanism according to one embodiment of the present invention;

[0018] Figure 4 The schematic diagram shows the internal structure of the separation mechanism according to one embodiment of the present invention;

[0019] Figure 5 The diagram schematically shows an exploded view of an ash hopper according to one embodiment of the present invention;

[0020] Figure 6 The schematic diagram shows a collection box structure according to one embodiment of the present invention;

[0021] Figure 7 The schematic diagram shows a desulfurization mechanism structure according to one embodiment of the present invention;

[0022] Figure 8 The diagram schematically shows an adsorption mechanism structure according to one embodiment of the present invention.

[0023] The diagram is labeled as follows: 1. Separation mechanism; 11. Cylindrical body; 12. Air inlet pipe; 13. Air outlet pipe; 14. Cone; 15. Support frame; 16. Ash hopper; 161. Connecting shell; 162. Funnel shell; 163. Vortex cover; 164. Connecting frame; 165. Rotating fan blade; 17. Collection box; 171. Shell; 172. Circular hole; 173. Cleaning box; 2. Desulfurization mechanism; 21. Desulfurization tower; 211. Drain valve; 212. Exhaust valve; 22. Pump; 221. Spraying mechanism; 23. Connecting pipe; 3. Adsorption mechanism; 31. Purification box; 32. Adsorption box; 321. Exhaust pipe one; 322. Exhaust pipe two. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0025] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0026] According to one embodiment of the present invention, in conjunction with Figure 1-4 The diagram illustrates a tunnel kiln tail gas purification structure, comprising a separation mechanism 1, a desulfurization mechanism 2 fixedly installed on one side of the separation mechanism 1, and an adsorption mechanism 3 fixedly installed on one side of the desulfurization mechanism 2. The separation mechanism 1 includes a cylindrical body 11, a cone 14 fixedly installed at the lower end of the cylindrical body 11, an air inlet pipe 12 fixedly installed on the outer wall of the cylindrical body 11, the air inlet pipe 12 being fixedly connected to an air guide device, an air outlet pipe 13 penetrating through the upper end of the cylindrical body 11, and both the air inlet pipe 12 and the air outlet pipe 13 communicating with the interior of the cylindrical body 11. An ash hopper 16 is fixedly installed at the lower end of the cone 14, and a collection box 17 is fixedly installed at the lower end of the ash hopper 16. When the tunnel kiln tail gas needs to be purified, the air guide device connects to the air inlet pipe 12. During large particle dust removal inside the cylindrical body 11 and the cone 14, the gas forms an airflow rotating around the axis of the separation mechanism 1 inside the cylindrical body 11 and the cone 14. This rotating airflow... The gas moves in a spiral motion from top to bottom, forming an outer vortex. During the rotation, solid particles or droplets in the gas, due to their larger mass, are thrown towards the inner wall of the separation mechanism 1 by centrifugal force, while the gas, due to its smaller mass, continues to rotate along the spiral path towards the bottom of the separation mechanism 1. The particles thrown towards the inner wall slide down the inner wall under the combined action of gravity and airflow, and finally fall into the ash hopper 16 at the bottom of the separation mechanism 1. The purified gas after separation reverses at the bottom of the separation mechanism 1, forming an inner vortex from bottom to top, and is discharged from the air outlet pipe 13 at the top of the separation mechanism 1. It has a high separation efficiency for larger dust particles, and can quickly and effectively remove most of the dust in the exhaust gas, reducing the burden on subsequent purification equipment. At the same time, it can be designed and selected according to parameters such as exhaust gas flow rate and dust concentration, and can adapt to the exhaust gas treatment needs of different working conditions. It can also play a good role in some high-temperature, high-concentration dust exhaust gases.

[0027] Combination Figure 3-5As shown, the ash hopper 16 includes a connecting shell 161, a funnel shell 162 fixedly installed at the lower end of the connecting shell 161, a vortex cover 163 fixedly installed at the upper end of the connecting shell 161, a connecting frame 164 fixedly installed inside the vortex cover 163, and a rotating fan blade 165 rotatably installed at the upper end of the connecting frame 164. Under the combined action of gravity and airflow, the particles on the inner wall slide down along the inner wall and finally fall into the funnel shell 162 at the bottom of the separation mechanism 1. The rotating fan blade 165 inside the vortex cover 163 rotates under the action of wind force to prevent dust from flying out of the funnel shell 162 and affecting the separation efficiency.

[0028] Combination Figure 3-4 , Figure 6 As shown, the collection box 17 includes a shell 171, and a round hole 172 is provided at the upper end of the shell 171. The round hole 172 is connected to the funnel shell 162. A cleaning box 173 is slidably installed inside the shell 171. Dust falling into the funnel shell 162 falls into the cleaning box 173 through the round hole 172 under the action of gravity for unified collection and cleaning.

[0029] Combination Figure 3-4 As shown, two sets of support frames 15 are fixedly installed on the outer side of the cone 14. The lower ends of the two sets of support frames 15 are fixedly connected to the shell 171. The support frames 15 support and fix the cylinder 11 and the cone 14 to prevent the risk of tilting and collapse.

[0030] Combination Figure 1-2 , Figure 7 As shown, the desulfurization mechanism 2 includes a desulfurization tower 21. A pump 22 is fixedly installed at the upper end of the desulfurization tower 21. Connecting pipes 23 are fixedly installed at both ends of the pump 22. One end of the connecting pipe 23 is connected to the lower end of the desulfurization tower 21. A spray mechanism 221 is fixedly installed at the output end of the pump 22. The desulfurization tower 21 is fixedly connected to the air outlet pipe 13 by bolts. A drain valve 211 is provided at the lower end of the side of the desulfurization tower 21 away from the air outlet pipe 13, and an exhaust valve 2 is provided in the middle of the side of the desulfurization tower 21 away from the air outlet pipe 13. 12. The exhaust valve 212 is connected to the adsorption mechanism 3. After large particle dust removal, the exhaust gas flows into the desulfurization tower 21 through the air outlet pipe 13. The pump 22 is started to make the alkaline solution react with the sulfur dioxide in the air through the spray mechanism 221 to desulfurize it. The desulfurized air flows into the adsorption mechanism 3 through the exhaust valve 212 for denitrification adsorption. During the desulfurization process, the pump 22 reuses the alkaline solution through the connecting pipe 23 to improve the utilization rate of resources.

[0031] Combination Figure 1-2 , Figure 8As shown, the adsorption mechanism 3 includes a purification box 31, an adsorption box 32 is fixedly installed on one side of the purification box 31, the lower ends of the purification box 31 and the adsorption box 32 are connected by an exhaust pipe 321, and an exhaust pipe 322 is installed through the upper end of the adsorption box 32. The air that has been desulfurized flows into the purification box 31 through the exhaust valve 212 for denitrification treatment. Under the action of a catalyst, nitrogen oxides are reduced to nitrogen and water by reducing agents such as ammonia. The exhaust gas after denitrification treatment is adsorbed by the exhaust pipe 321 at the lower end of the adsorption box 32 to adsorb residual organic pollutants, odor substances and some trace harmful gases that are difficult to remove, thereby improving the quality of exhaust gas purification. Finally, it is discharged through the exhaust pipe 322.

[0032] In this embodiment, when the exhaust gas of the tunnel kiln is purified, the exhaust gas enters the separation mechanism 1 composed of the cylindrical body 11 and the conical body 14 through the air guide device from the air inlet pipe 12. Inside, an airflow rotating around the axis is formed. Larger solid particles or droplets in the outer swirling flow are thrown towards the inner wall by centrifugal force and slide down the wall to the funnel shell 162 of the ash hopper 16. Then, they fall into the cleaning box 173 of the collection box 17 through the round hole 172. The purified gas forms an inner swirling flow and is discharged from the air outlet pipe 13. Subsequently, the exhaust gas enters the desulfurization mechanism through the air outlet pipe 13. In the desulfurization tower 21 of unit 2, the pump 22 sprays an alkaline solution through the spray mechanism 221 to react with sulfur dioxide in the tail gas for desulfurization. The alkaline solution is reused by the pump 22 through the connecting pipe 23. After desulfurization, the tail gas flows out from the exhaust valve 212. Then the tail gas enters the purification box 31 of the adsorption mechanism 3. Under the action of the catalyst, nitrogen oxides are reduced to nitrogen and water by reducing agents such as ammonia. After desulfurization, the tail gas enters the adsorption box 32 through the exhaust pipe 1 321 to adsorb residual organic pollutants, and finally is discharged through the exhaust pipe 2 322.

[0033] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A tunnel kiln tail gas purification structure, characterized in that: The device includes a separation mechanism, a desulfurization mechanism fixedly installed on one side of the separation mechanism, an adsorption mechanism fixedly installed on one side of the desulfurization mechanism, a cylindrical body, a cone fixedly installed at the lower end of the cylindrical body, an air inlet pipe fixedly installed on the outer wall of the cylindrical body, the air inlet pipe being fixedly connected to an air guide device, an air outlet pipe penetrating through the upper end of the cylindrical body, both the air inlet pipe and the air outlet pipe communicating with the interior of the cylindrical body, an ash hopper fixedly installed at the lower end of the cone, and a collection box fixedly installed at the lower end of the ash hopper.

2. The tunnel kiln tail gas purification structure according to claim 1, characterized in that: The ash hopper includes a connecting shell, a funnel shell is fixedly installed at the lower end of the connecting shell, a vortex cover is fixedly installed at the upper end of the connecting shell, a connecting frame is fixedly installed inside the vortex cover, and a rotating fan blade is rotatably installed at the upper end of the connecting frame.

3. The tunnel kiln tail gas purification structure according to claim 2, characterized in that: The collection box includes a shell, the upper end of which has a circular hole that communicates with the funnel shell, and a cleaning box is slidably installed inside the shell.

4. The tunnel kiln tail gas purification structure according to claim 3, characterized in that: Two sets of support frames are fixedly installed on the outer side of the cone, and the lower ends of the two sets of support frames are fixedly connected to the shell.

5. The tunnel kiln tail gas purification structure according to claim 1, characterized in that: The desulfurization mechanism includes a desulfurization tower, a pump fixedly installed at the upper end of the desulfurization tower, connecting pipes fixedly installed at both ends of the pump, one end of the connecting pipe being connected to the lower end of the desulfurization tower, a spraying mechanism fixedly installed at the output end of the pump, the desulfurization tower being fixedly connected to the air outlet pipe by bolts, a drain valve being provided at the lower end of the side of the desulfurization tower away from the air outlet pipe, and an exhaust valve being provided at the middle of the side of the desulfurization tower away from the air outlet pipe, the exhaust valve being connected to the adsorption mechanism.

6. The tunnel kiln tail gas purification structure according to claim 1, characterized in that: The adsorption mechanism includes a purification box, an adsorption box is fixedly installed on one side of the purification box, the lower end of the purification box and the adsorption box are connected through an exhaust pipe, and an exhaust pipe is installed through the upper end of the adsorption box.

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