Dust-containing tail gas incinerator

Abstract

The present invention relates to a dust-containing tail gas incinerator, which comprises an incinerator body. The incinerator body is provided with a flame section and a tail gas inlet section independent of the flame section. The flame section includes a horizontal cylinder and a combustion chamber located within the horizontal cylinder. The horizontal cylinder is provided with a combustion-supporting inlet pipe, and the combustion-supporting inlet pipe is communicated with the combustion chamber. A first cooling fresh air inlet pipe is provided on the side wall of the horizontal cylinder. The tail gas inlet section includes a tail gas flow channel, and the tail gas flow channel has a broken line shape that first extends obliquely upward and then extends obliquely downward. The second end of the tail gas flow channel is arranged to be tangent to the inner wall of the incinerator body, which can fully remove the combustible components in the tail gas and remove a large amount of dust existing in the tail gas, thereby effectively prolonging the service life of downstream equipment and pipelines and reducing the maintenance cost of downstream equipment and pipelines. It also improves the convenience of manual ash cleaning in maintenance operations.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and particularly to a dust-containing tail gas incinerator. Background Art

[0002] Some industrial tail gases mainly contain dust particles, sulfides, as well as CO and VOCs gases formed by incomplete oxidation of waste materials. Such tail gases need to be further purified and treated and can be discharged into the atmosphere only after meeting the emission standards. To remove these combustible components in the tail gas, a tail gas incinerator needs to be designed to provide sufficient temperature and reaction time for the oxidation of the combustible components in the tail gas, so as to fully convert them into CO2 and make the concentrations of CO and VOCs in the discharged gas meet the standards.

[0003] The tail gas incinerator not only needs to consider fully breaking down the combustible components in the tail gas, but also needs to consider initially removing a large amount of dust in the tail gas, so as to effectively extend the service life of downstream equipment and pipelines and reduce the maintenance cost of downstream equipment and pipelines. In addition, the design of the incinerator needs to consider the convenience of manual ash cleaning during maintenance operations. Summary of the Invention

[0004] In order to solve the above problems in the prior art, the present invention provides a dust-containing tail gas incinerator with combustible components, which can remove combustible components and dust and reduce the maintenance cost.

[0005] In order to achieve the above object, the present invention provides a dust-containing tail gas incinerator, which is mainly characterized by including an incinerator body, and the incinerator body is provided with a flame section and a tail gas inlet section independent of the flame section;

[0006] The flame section includes a horizontal cylinder and a combustion chamber located in the horizontal cylinder. The horizontal cylinder is provided with a combustion-supporting air inlet pipe and a gas inlet pipe. The combustion-supporting air inlet pipe and the gas inlet pipe are connected to the combustion chamber through a burner head. The combustion chamber is used to form a stable flame. The end of the horizontal cylinder is connected to the furnace wall of the incinerator body. The side wall of the horizontal cylinder is provided with a first cooling fresh air inlet pipe. The longitudinal axis of the first cooling fresh air inlet pipe is perpendicular to the longitudinal axis of the horizontal cylinder, and the first cooling fresh air inlet pipe is tangent to the inner wall of the horizontal cylinder. The end of the horizontal cylinder is arranged to be tangent to the inner wall of the incinerator body;

[0007] The described tail gas inlet section includes a tail gas flow channel. The first end of the tail gas flow channel is the tail gas inlet, and the second end of the tail gas flow channel is connected to the furnace wall of the incinerator body. In the direction from the first end to the second end of the tail gas flow channel, the tail gas flow channel has a broken line shape that first extends upwardly and then extends downwardly, and the second end of the tail gas flow channel is arranged to be tangent to the inner wall of the incinerator body.

[0008] Preferably, a turbulence ring is arranged at the end of the horizontal cylinder.

[0009] Preferably, the tail gas inlet section includes a second fresh cooling air inlet pipe, which is arranged to slope downward, and the pipe orifice of the second fresh cooling air inlet pipe is aligned with the ramp plane of the rear section of the tail gas flow channel.

[0010] Preferably, a tail gas cut-off valve is arranged in the tail gas flow channel.

[0011] Preferably, a flexible connection is arranged at the first end of the tail gas flow channel for connecting to the tail gas outlet flange of the upstream production equipment. The flexible connection includes an outer cylinder, an inner cylinder and a coating layer. The outer cylinder is provided with a first flange for connecting to the tail gas outlet of the upstream production equipment. The inner cylinder is independently sleeved inside the outer cylinder. The inner cylinder is provided with a second flange. There is a preset gap between the inner cylinder and the outer cylinder. The inner cylinder is connected to the first end of the tail gas flow channel, and the coating layer covers the visible parts of the outer cylinder and the inner cylinder.

[0012] Preferably, the rotation direction of the gas flow entering the incinerator body from the flame section is the same as the swirl direction of the gas flow entering the incinerator body from the tail gas inlet section.

[0013] Preferably, the incinerator body is a vertical cylinder. The flame section and the tail gas inlet section are both located on the bottom side wall of the vertical cylinder, and an exhaust port is arranged at the top of the vertical cylinder.

[0014] Preferably, the bottom end of the vertical cylinder is an inverted conical bottom end, and the maximum diameter of the cross section of the inverted conical bottom end is equal to the diameter of the vertical cylinder.

[0015] The beneficial effects of the present invention are as follows:

[0016] By using the dust-containing tail gas incinerator of the present invention, the combustible components in the tail gas can be fully removed, and a large amount of dust existing in the tail gas can be removed, thereby effectively extending the service life of the downstream equipment and pipelines and reducing the maintenance cost of the downstream equipment and pipelines; it also improves the convenience of manual ash cleaning in maintenance operations. Description of the Drawings

[0017] Figure 1 Structural schematic diagram of the dust-containing tail gas incinerator of the present invention.

[0018] Figure 2 Cross-sectional view of the tail gas inlet section in the dust-containing tail gas incinerator of the present invention.

[0019] Figure 3 Cross-sectional view of the dust-containing tail gas incinerator of the present invention.

[0020] Figure 4A Cross-sectional view of the flexible connection in the dust-containing tail gas incinerator of the present invention; Figure 4B is Figure 4A Partial enlarged schematic diagram of the circle D in

[0021] Figure 5 Velocity distribution nephogram in the incinerator body.

[0022] Figure 6 Velocity vector distribution diagram of the flame section of the incinerator.

[0023] Figure 7 Velocity vector distribution diagram of the tail gas inlet section of the incinerator.

[0024] Figure 8 Flow field trace line distribution diagram of the first perspective of the combustion chamber of the incinerator.

[0025] Figure 9 Flow field trace line distribution diagram of the second perspective of the combustion chamber of the incinerator. Specific embodiments

[0026] In order to more clearly describe the technical content of the present invention, the following will be further described in conjunction with specific embodiments.

[0027] As Figures 1 to 4B shown, it is a specific embodiment of the dust-containing tail gas incinerator of the present invention. Among them, the incinerator includes an incinerator body 1, and the incinerator body 1 is provided with a flame section 2 and a tail gas inlet section 3 independent of the flame section 2.

[0028] The flame section 2 includes a horizontal cylinder and a combustion chamber located in the horizontal cylinder. The horizontal cylinder is provided with a combustion-supporting air inlet pipe 13 and a gas inlet pipe 15. The combustion-supporting air inlet pipe 13 and the gas inlet pipe 15 are connected to the combustion chamber through a burner head. The combustion chamber is used to form a stable flame. The end of the horizontal cylinder is connected to the furnace wall of the incinerator body 1. The side wall of the horizontal cylinder is provided with a first cooling fresh air inlet pipe 4. The longitudinal axis of the first cooling fresh air inlet pipe 4 is perpendicular to the longitudinal axis of the horizontal cylinder, and the first cooling fresh air inlet pipe 4 is tangent to the inner wall of the horizontal cylinder. As Figure 3As shown, the end of the horizontal cylinder is arranged to be tangent to the inner wall of the incinerator body. After gas such as natural gas and combustion-supporting air are ignited at the burner head, a flame with a fixed length and diameter is formed in the combustion chamber. Under normal operating conditions, no cooling air is introduced through the first fresh cooling air inlet pipe; during the purging operation, cooling air is introduced through the first fresh cooling air inlet pipe; in addition, when the concentrations of CO, VOCs, etc. in the tail gas entering the incinerator are high and the heat released during combustion causes the combustion temperature to exceed the set value, cooling air is introduced through the first fresh cooling air inlet pipe. A certain proportion of the cooling air is mixed with the combustion products in the flame section. At this time, the burner operates at the lowest power to keep the combustion chamber temperature within the set range and reduce the combustion chamber temperature.

[0029] As Figure 2 shown, the tail gas inlet section 3 includes a tail gas flow channel. The first end of the tail gas flow channel is the tail gas inlet, which is connected to the upstream production equipment through the tail gas inlet of the tail gas flow channel. The second end of the tail gas flow channel is connected to the furnace wall of the incinerator body 1. In the direction from the first end to the second end of the tail gas flow channel, the tail gas flow channel has a broken line shape that first extends upward and then extends downward, that is, the tail gas flow channel has a front section 6 of the tail gas flow channel and a rear section 7 of the tail gas flow channel. Based on this broken line shape, it can effectively prevent the particulate matter carried in the tail gas from continuously accumulating in the tail gas flow channel during normal operation, reducing the frequency and difficulty of manual ash cleaning. As Figure 3 shown, the second end of the tail gas flow channel is arranged to be tangent to the inner wall of the incinerator body 1. Further, the rotation direction of the air flow entering the incinerator body 1 from the flame section 2 is the same as the swirl direction of the air flow entering the incinerator body 1 from the tail gas inlet section 3.

[0030] For the tail gas flow channel of the present invention, in the direction from the first end to the second end of the tail gas flow channel, the front section 6 of the tail gas flow channel, that is, the upwardly inclined section, effectively reduces the possibility of particulate matter in the tail gas adhering to or even accumulating on the inner wall of the front section. These particulate matters will fall back to the upstream production equipment; the rear section 7 of the tail gas flow channel, that is, the downwardly inclined section, can also reduce the possibility of particulate matter adhering to the inner wall of the rear section. The particulate matter will enter the incinerator body along the downward ramp, facilitating subsequent centralized ash cleaning operations.

[0031] Dusty tail gas, especially the flue gas from upstream production equipment, enters from the tail gas inlet of the tail gas flow channel and enters the incinerator body along the tail gas flow channel in a tangential direction. The gas sent out by the flame section 2 also enters the incinerator body in a tangential direction. The rotation direction of the tail gas flow channel and the flame section gas in the incinerator body 1 is the same, forming a spiral upward rotating gas flow in the incinerator body 1. Larger-sized dust particles in the gas are thrown to the inner wall of the furnace body under the action of centrifugal force and accumulate towards the bottom of the furnace body under the action of gravity, thereby realizing the preliminary separation of gas and solid.

[0032] In the flame section 2 of the incinerator of the present invention, the cross-section of the first cooling fresh air inlet pipe 4 can be circular. Based on this first cooling fresh air inlet pipe 4, the gas turbulence degree in the flame section is further increased, and the air flow is made to rotate, with the rotation direction parallel to the longitudinal axis of the flame section, making it easier for the gas sent from the flame section to the reaction section to mix with the tail gas; in addition, in the working condition where the cooling air sent to the flame section and the burner are turned on simultaneously, the flame temperature can also be reduced to a certain extent, avoiding the risk of excessive nitrogen oxide concentration caused by too high flame temperature.

[0033] In the incinerator of the present invention, the tail gas inlet section 3 and the flame section 2 are independent of each other and enter the incinerator body 1 respectively, and the swirling directions formed in the incinerator body 1 are the same. On the one hand, it avoids the possibility of ash accumulation in the horizontal cylinder of the flame section 2; on the other hand, it reduces the influence of the tail gas on the flame shape and is beneficial to the stable operation of the flame section.

[0034] As Figure 3 shown, a turbulence ring 12 is provided at the end of the horizontal cylinder body, which can increase the gas turbulence degree and at the same time protect the flame and avoid the air flow in the incinerator body 1 having a greater influence on the flame shape. The turbulence ring 12 used in the present invention is a retracted structure located at the end of the horizontal cylinder body, and its cross-section is trapezoidal.

[0035] As Figure 1 and Figure 2 shown, the tail gas inlet section 3 includes a second cooling fresh air inlet pipe 5. The second cooling fresh air inlet pipe 5 is arranged obliquely downward, and the pipe orifice of the second cooling fresh air inlet pipe 5 is aligned with the ramp plane of the rear section 7 of the tail gas flow channel. The axis of the second cooling fresh air inlet pipe is parallel to the ramp plane of the rear section 7 of the tail gas flow channel. The second cooling fresh air inlet pipe 5 has the same inclination angle as the rear slope of the tail gas flow channel, and the high-speed jet of the cooling air can blow the ramp in the rear section 7 of the tail gas flow channel. The cross-section of the second cooling fresh air inlet pipe 5 can be circular and is inserted obliquely downward into the rear section 7 of the tail gas flow channel. During the ash cleaning operation, the ramp of the rear section 7 of the tail gas flow channel can be directly blown by the fresh air, and the possible accumulated ash on the ramp can be blown to the bottom of the incinerator, thereby reducing the frequency and difficulty of manual ash cleaning operations.

[0036] In the present invention, the fresh cooling air can be drawn from the outdoor air by a cooling fan and is divided into two parts and fed into the incinerator. One part is fed tangentially into the flame section 2, and the other part is fed into the tail gas inlet section 3.

[0037] A tail gas cut-off valve is provided in the tail gas flow path described above to cut off the gas passage between the upstream production equipment and the incinerator. The incinerator can function independently after the upstream production equipment is taken offline. The overall structure of the valve can be a gate valve and is manually operated. The valve preferably adopts an internal insulation design, and the internal insulation can use castable.

[0038] As Figure 4A shown, a flexible connection 8 is provided at the first end of the tail gas flow path described above for connecting to the tail gas outlet flange of the upstream production equipment, facilitating the on-site installation and connection of the upstream production equipment and the incinerator; in addition, it can effectively absorb the expansion in the vertical and radial directions at the tail gas outlet of the upstream production equipment, avoiding the stress impact on the tail gas inlet section of the incinerator. As Figure 4A and Figure 4B shown, the flexible connection body is divided into three parts, namely an outer cylinder, an inner cylinder, and a high-temperature resistant flexible coating material. The outer cylinder includes an outer cylinder wall 9 and a flange, and the outer cylinder is connected to the tail gas outlet of the upstream production equipment. The inner cylinder includes an inner cylinder wall 10, a flange, and a castable lining 14. The inner cylinder is connected to the interface of the tail gas flow path of the incinerator. There is a ring plate at the bottom of the inner cylinder wall to support the castable lining. The diameter of the inner cylinder is smaller than that of the outer cylinder. During normal installation, the inner cylinder is inserted into the outer cylinder, and the insertion depth is controlled at the design value, and the gap between the inner cylinder and the outer cylinder is controlled at the design value. The high-temperature resistant flexible coating material 11 is coated around the outer periphery of the inner cylinder and the outer cylinder to ensure that the visible parts of the inner cylinder and the outer cylinder are covered with high-temperature resistant flexible coating material. One end of the high-temperature resistant flexible coating material is tied and fixed to the outer wall of the inner cylinder with a metal strap, and the other end is fixed to the outer wall of the outer cylinder.

[0039] The inner cylinder and the outer cylinder are independent of each other and can absorb the axial displacement caused by thermal expansion of the upstream production equipment and the incinerator during normal operation. A certain gap is provided between the inner cylinder and the outer cylinder to absorb the radial displacement caused by thermal expansion. The high-temperature resistant flexible coating material coated on the outer surface of the cylinder has a certain flexibility and can withstand the relative displacement between the inner and outer cylinders. The high-temperature resistant flexible coating material is fixed with a strap, which is convenient for regular replacement. In addition, since the combustion chambers of the upstream production equipment and the incinerator are both under negative pressure during normal operation, high-temperature gases will not overflow outdoors from the gap between the inner and outer cylinders.

[0040] The incinerator body 1 is a vertical cylinder, and the flame section 2 and the tail gas inlet section 3 are both located on the bottom side wall of the vertical cylinder, and an exhaust port is arranged on the top of the vertical cylinder. The gas flow channel of the flame section 2 is perpendicular to the flow channel of the incinerator body 1. The incinerator body can adopt an internal insulation design, for example, a variety of specifications of refractory bricks, castables and thermal insulation materials are selected, which have the functions of wear-resistant inner wall and heat insulation. The vertical cylinder can adopt carbon steel or stainless steel cylinder wall. A heat insulation cover is installed on the outer surface of the furnace body that can be touched by personnel to prevent personnel from being scalded. The volume design of the vertical cylinder meets the maximum residence time requirement of the combustible components in the tail gas, ensuring that the combustible components react fully.

[0041] The high-temperature gas from the flame section 2 and the exhaust gas from the exhaust inlet section 3 enter the incinerator body 1 from the vertical cylindrical side wall at the bottom of the incinerator body respectively. The two gases are fully mixed in the incinerator body 1 and are sent out of the incinerator from the top exhaust port in the incinerator body after sufficient reaction.

[0042] The bottom end of the vertical cylinder is an inverted cone-shaped bottom end, which is funnel-shaped, and the maximum cross-sectional diameter of the inverted cone-shaped bottom end is equal to the diameter of the vertical cylinder. The inverted cone-shaped bottom end can be connected to an ash discharge pipeline and connected to a screw feeder, so that the collected dust falls into an ash hopper or a feeding device along the ash discharge pipeline and is continuously discharged.

[0043] The dust-containing tail gas incinerator based on the present invention specifically involves two different working conditions: a normal operating condition and a purge condition.

[0044] When the incinerator is in normal operating conditions, the exhaust gas shut-off valve is in the open state, and the exhaust gas from the upstream production equipment enters the vertical cylinder through the exhaust gas flow duct of the incinerator. The burner operates at a certain power to maintain the temperature in the incinerator combustion chamber at the design value, and the air supply fan for cooling fresh air is completely closed, so no cooling fresh air is sent into the flame section and the exhaust gas inlet section.

[0045] When the incinerator is in the purge condition, the gas supply of the incinerator burner is in a closed state, and the combustion-supporting air is continuously sent into the flame section through the burner head to purge the flame section; the exhaust gas shut-off valve is in a completely closed state, isolating the gas passage from the upstream production equipment, and the induced draft fan located downstream of the incinerator sucks the gas in the incinerator for a certain period of time. In order to speed up the replacement of the gas in the incinerator and the pipeline, the cooling air fan is turned on simultaneously to send fresh air into the flame section and the exhaust gas inlet section.

[0046] The purpose of purging the incinerator is to clean the combustible gas remaining in the equipment and pipelines of the entire system after the last exhaust gas treatment, as well as the potential accumulation of gas leakage caused by the lax closure of the gas shut-off valve at the burner head.

[0047] The present invention provides a simulation calculation of the operation of the incinerator, which proves that the equipment meets the performance requirements. The performance requirements are as follows: the static pressure loss at the inlet and outlet of the incinerator is within a reasonable range; the gas flow field in the incinerator is stable and reliable, and the inlet air volume configuration is reasonable.

[0048] The simulation calculation involves:

[0049] The computational fluid dynamics method (CFD METHOD), and the specific steps are as follows:

[0050] Calculate the preliminary external dimensions and interface dimensions according to the design input parameters;

[0051] Establish a geometric model;

[0052] Establish a three-dimensional model of the incinerator, generate a topological model, set the grid parameters and generate the grid;

[0053] Set the basic model parameters, physical calculation model parameters, fluid medium parameters, boundary conditions, solver setting parameters, etc. in the CFD simulation calculation software;

[0054] Run the simulation calculation and obtain the results;

[0055] Post-process the simulation results and output a report.

[0056] In the above simulation calculation process, the specific design input parameters involved are as follows:

[0057] (1) Tail gas parameters of upstream production equipment

[0058] The tail gas gas components of the upstream production equipment are shown in Table 1 below:

[0059]

[0060] (2) Gas parameters in the flame section

[0061] The burner turns on the gas according to the load demand and proportionally configures the combustion-supporting air. Premixed combustion is carried out in the burner nozzle, and the gas sent into the incinerator is the product after the complete combustion of natural gas. The gas components are calculated according to the theoretical gas flow rate and the combustion-supporting air flow rate, as shown in Table 2 below.

[0062]

[0063] Calculation simulation results

[0064] (1) Simulation results of the process gas state parameters of the incinerator

[0065] The state parameters of the gas at the inlet and outlet of the incinerator are shown in Table 3 below.

[0066]

[0067] Description:

[0068] The static pressure loss from the inlet of the incinerator tail gas to the outlet of the incinerator is 383 Pa, and this static pressure difference can meet the operation requirements of the downstream incinerator.

[0069] The cooling air is not turned on under normal operating conditions.

[0070] (2) Velocity distribution inside the incinerator

[0071] The velocity distribution nephogram inside the incinerator is as follows Figure 5 shown.

[0072] (3) Velocity vector distribution in the flame section and tail gas pipeline of the incinerator

[0073] The velocity vector distribution in the flame section of the incinerator is as Figure 6 shown, and the velocity vector distribution in the tail gas inlet section of the incinerator is as Figure 7 shown.

[0074] (4) Flow field trace distribution inside the incinerator

[0075] The flow field trace distributions at different perspectives inside the incinerator are as Figure 8 and Figure 9 shown.

[0076] From the above results, it can be seen that a stable spiral upward air flow can be formed inside the incinerator. The gas flow velocity near the inner wall of the incinerator is > 25 m / s. The large-mass particulate matters in the air flow are thrown to the inner wall of the reaction section under the action of centrifugal force and fall to the bottom ash collection pipeline under the action of gravity. The velocity component of the air flow near the inner wall in the vertical direction is very small, and the influence on the downward movement of particulate matters is limited. The air flow inside the incinerator has a very limited influence on the air flow in the flame section, which can ensure the stability of the flow pattern in the flame section.

[0077] The beneficial effects of the present invention are as follows:

[0078] By using the dust-containing tail gas incinerator of the present invention, the combustible components in the tail gas can be fully removed, and a large amount of dust existing in the tail gas can be removed, thereby effectively prolonging the service life of downstream equipment and pipelines and reducing the maintenance and repair costs of downstream equipment and pipelines; it also improves the convenience of manual ash cleaning during maintenance operations.

[0079] In this specification, the present invention has been described with reference to its specific embodiments. However, it is obvious that various modifications and transformations can still be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A dust-containing tail gas incinerator, characterized in that: It comprises an incinerator body, wherein the incinerator body is provided with a flame section and an exhaust gas inlet section independent of the flame section; The flame section includes a horizontal cylinder and a combustion chamber located in the horizontal cylinder, the horizontal cylinder is provided with a combustion-supporting air inlet pipe and a fuel gas inlet pipe, the combustion-supporting air inlet pipe and the fuel gas inlet pipe are connected with the combustion chamber through a burner head, the combustion chamber is used to form a stable flame, the end of the horizontal cylinder is connected with the furnace wall of the incinerator body, the side wall of the horizontal cylinder is provided with a first cooling fresh air inlet pipe, the longitudinal axis of the first cooling fresh air inlet pipe is perpendicular to the longitudinal axis of the horizontal cylinder, the first cooling fresh air inlet pipe is tangent to the inner wall of the horizontal cylinder, and the end of the horizontal cylinder is arranged to be tangent to the inner wall of the incinerator body; The exhaust gas inlet section includes an exhaust gas flow channel, the first end of the exhaust gas flow channel is the exhaust gas inlet, the second end of the exhaust gas flow channel is connected to the furnace wall of the incinerator body, and in the direction from the first end of the exhaust gas flow channel to the second end of the exhaust gas flow channel, the exhaust gas flow channel has a broken line shape that first extends upward and then extends downward, the second end of the exhaust gas flow channel is arranged to be tangent to the inner wall of the incinerator body, and a turbulence ring is arranged at the end of the horizontal cylinder.

2. The dust-containing tail gas incinerator according to claim 1, characterized in that: The exhaust gas inlet section comprises a second cooling fresh air inlet pipe, which is arranged obliquely downward and the pipe opening of the second cooling fresh air inlet pipe is aligned with the ramp plane of the rear section of the exhaust gas flow channel.

3. The dust-containing tail gas incinerator according to claim 1, characterized in that: The tail gas flow passage is provided with a tail gas cut-off valve.

4. The dust-containing tail gas incinerator according to claim 1, characterized in that: A flexible connection is provided at the first end of the exhaust gas flow channel for connecting to the exhaust gas outlet flange of the upstream production equipment. The flexible connection includes an outer tube, an inner tube and a coating layer. The outer tube is provided with a first flange for connecting to the exhaust gas outlet of the upstream production equipment. The inner tube is independently sleeved in the outer tube. The inner tube is provided with a second flange. A preset gap is provided between the inner tube and the outer tube. The inner tube is connected to the first end of the exhaust gas flow channel. The coating layer covers the external visible parts of the outer tube and the inner tube.

5. The dust-containing tail gas incinerator according to claim 1, characterized in that: The rotation direction of the airflow entering the incinerator body from the flame section is the same as the swirl direction of the airflow entering the incinerator body from the tail gas inlet section.

6. The dust-containing tail gas incinerator according to claim 1, characterized in that: The incinerator body is a vertical cylinder, the flame section and the tail gas inlet section are both located on the bottom side wall of the vertical cylinder, and the top of the vertical cylinder is provided with an exhaust port.

7. The dust-containing tail gas incinerator according to claim 6, characterized in that: The bottom end of the vertical cylinder is an inverted cone-shaped bottom end, and the maximum diameter of the cross section of the inverted cone-shaped bottom end is equal to the diameter of the vertical cylinder.

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