Dust-containing tail gas incinerator

Abstract

The invention relates to a dust-containing tail gas incinerator which comprises an incinerator body, and the incinerator body is provided with a flame section and a tail gas inlet section independent of the flame section. The flame section comprises a horizontal barrel and a combustion chamber located in the horizontal barrel, the horizontal barrel is provided with a combustion-supporting inlet pipe, the combustion-supporting inlet pipe is communicated with the combustion chamber, and the side wall of the horizontal barrel is provided with a first cooling fresh air inlet pipe; the tail gas inlet section comprises a tail gas flow channel, the tail gas flow channel is in a fold line shape which obliquely extends upwards and then obliquely extends downwards, the second end of the tail gas flow channel is arranged to be tangent to the inner wall of the incinerator body, combustible components in tail gas can be fully removed, a large amount of dust in the tail gas can be removed, and the tail gas can be recycled. Therefore, the service lives of downstream equipment and pipelines are effectively prolonged, and the maintenance cost of the downstream equipment and the pipelines is reduced; and the convenience of manual ash removal in the maintenance operation is also improved.

Description

Technical Field

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

[0002] Some industrial tail gas mainly contains dust particles, sulfides, and CO and VOCs gases formed by incomplete oxidation of waste materials. Such tail gas needs to be further purified and treated to meet the emission standards before it can be discharged into the atmosphere. In order to remove these combustible components in the tail gas, it is necessary to design a tail gas incinerator 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 CO and VOCs concentrations of the exhaust gas meet the standards.

[0003] The exhaust gas incinerator must not only consider fully breaking down the combustible components in the exhaust gas, but also consider the preliminary removal of the large amount of dust in the exhaust gas, thereby effectively extending the life of downstream equipment and pipelines, and reducing the maintenance costs of downstream equipment and pipelines. In addition, the incinerator design needs to consider the convenience of manual 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 tail gas incinerator containing dust and combustible components, which can remove combustible components and dust and reduce maintenance costs.

[0005] In order to achieve the above object, the present invention provides a dust-containing tail gas incinerator, which mainly comprises an incinerator body, wherein 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 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, and the second end of the exhaust gas flow channel is arranged to be tangent to the inner wall of the incinerator body.

[0006] Preferably, a turbulence ring is provided at the end of the horizontal cylinder.

[0007] Preferably, the exhaust gas inlet section includes a second cooling fresh air inlet pipe, the second cooling fresh air inlet pipe 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.

[0008] Preferably, the exhaust gas flow passage is provided with an exhaust gas shut-off valve.

[0009] Preferably, 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.

[0010] Preferably, 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 exhaust gas inlet section.

[0011] Preferably, the incinerator body is a vertical cylinder, the flame section and the exhaust gas inlet section are both located on the bottom side wall of the vertical cylinder, and the exhaust port is arranged on the top of the vertical cylinder.

[0012] 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.

[0013] The beneficial effects of the present invention are: The dust-containing tail gas incinerator of the present invention can fully remove the combustible components in the tail gas and remove a large amount of dust in the tail gas, thereby effectively extending the life of downstream equipment and pipelines and reducing the maintenance cost of downstream equipment and pipelines; it also improves the convenience of manual dust cleaning during maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the dust-containing tail gas incinerator of the present invention.

[0015] Figure 2 It is a cross-sectional view of the tail gas inlet section of the dust-containing tail gas incinerator of the present invention.

[0016] Figure 3 It is a cross-sectional view of the dust-containing tail gas incinerator of the present invention.

[0017] Figure 4A It is a cross-sectional view of a flexible connection in the dust-containing tail gas incinerator of the present invention; Figure 4B for Figure 4A A partial enlarged schematic diagram of the middle circle D.

[0018] Figure 5 This is the velocity distribution cloud map inside the incinerator.

[0019] Figure 6 This is the velocity vector distribution diagram of the incinerator flame section.

[0020] Figure 7 This is the velocity vector distribution diagram of the inlet section of the incinerator exhaust gas.

[0021] Figure 8 This is the flow field trajectory distribution diagram of the incinerator combustion chamber from the first perspective.

[0022] Fig. 9 This is the flow field trajectory distribution diagram of the incinerator combustion chamber from the second perspective. DETAILED DESCRIPTION

[0023] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0024] like Figures 1 to 4B The figure shows a specific embodiment of the dust-containing tail gas incinerator of the present invention, wherein the incinerator comprises an incinerator body 1 , wherein the incinerator body 1 is provided with a flame section 2 and a tail gas inlet section 3 independent of the flame section 2 .

[0025] 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. The first cooling fresh air inlet pipe 4 is tangent to the inner wall of the horizontal cylinder. Figure 3As shown, the end of the horizontal cylinder is arranged to be tangent to the inner wall of the incinerator body. After the gas such as natural gas and the combustion-supporting air are ignited at the head of the burner, a flame of fixed length and diameter is formed in the combustion chamber. In normal operation, the first cooling fresh air inlet pipe does not introduce cooling air; in purge operation, the first cooling fresh air inlet pipe introduces cooling air; in addition, when the heat released during the combustion of CO and VOCs in the tail gas entering the incinerator with high concentrations causes the combustion temperature to exceed the set value, the first cooling fresh air inlet pipe introduces cooling air, and a certain proportion of cooling air is mixed with the combustion products in the flame section. At this time, the burner is in the lowest power operation, and the combustion chamber temperature is lowered to maintain the combustion chamber temperature within the set range.

[0026] like Figure 2 As shown, the exhaust gas inlet section 3 includes an exhaust gas flow channel, the first end of which is the exhaust gas inlet, which is connected to the upstream production equipment through the exhaust gas inlet of the exhaust gas flow channel, and the second end of which is connected to the furnace wall of the incinerator body 1. 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 folded line shape that first extends upward and then extends downward, that is, the exhaust gas flow channel has a front section 6 and a rear section 7 of the exhaust gas flow channel. Based on the folded line shape, it can effectively prevent the particulate matter carried in the exhaust gas from continuously accumulating in the exhaust gas flow channel during normal operation, thereby reducing the frequency and difficulty of manual cleaning. Figure 3 As shown, the second end of the exhaust gas flow passage is arranged to be tangent to the inner wall of the incinerator body 1. Furthermore, the rotation direction of the airflow entering the incinerator body 1 from the flame section 2 is the same as the swirl direction of the airflow entering the incinerator body 1 from the exhaust gas inlet section 3.

[0027] For the exhaust gas flow channel of the present invention, in the direction from the first end of the exhaust gas flow channel to the second end of the exhaust gas flow channel, the front section 6 of the exhaust gas flow channel, that is, the upward inclined section, effectively reduces the possibility of particulate matter in the exhaust gas adhering to or even accumulating on the inner wall of the front section, and these particulate matter will fall back into the upstream production equipment; the rear section 7 of the exhaust gas flow channel, that is, the downward inclined section, can also reduce the possibility of particulate matter adhering to the inner wall of the rear section, and the particulate matter will enter the incinerator body along the downward ramp, which is convenient for subsequent centralized ash cleaning operations.

[0028] Dust-containing exhaust gas, especially the flue gas from upstream production equipment, enters from the exhaust gas inlet of the exhaust gas flow duct and enters the incinerator body in a tangential direction along the exhaust gas flow duct. The gas delivered by the flame section 2 also enters the incinerator body in a tangential direction. The exhaust gas flow duct and the flame section airflow have the same rotation direction in the incinerator body 1, and a spirally rising rotating airflow is formed in the incinerator body 1. The dust with larger particle size in the gas is thrown to the inner wall of the furnace body by centrifugal force and accumulates to the bottom of the furnace body by gravity, thereby realizing the preliminary separation of gas and solid.

[0029] 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 the first cooling fresh air inlet pipe 4, the turbulence of the flame section gas is further increased, and the airflow is rotated, and the rotation direction is parallel to the longitudinal axis of the flame section, so that the gas sent to the reaction section by the flame section is easier to mix with the tail gas; in addition, in the working condition where the cooling air is sent to the flame section and the burner is turned on at the same time, the flame temperature can also be reduced to a certain extent, avoiding the risk of excessive nitrogen oxide concentration caused by excessive flame temperature.

[0030] 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 swirl directions formed in the incinerator body 1 are the same. On the one hand, the possibility of ash accumulation in the horizontal cylinder of the flame section 2 is avoided; on the other hand, the influence of the tail gas on the flame shape is reduced, which is beneficial to the stable operation of the flame section.

[0031] like Figure 3 As shown, a turbulence ring 12 is provided at the end of the horizontal cylinder to increase gas turbulence and protect the flame, thereby preventing the airflow in the incinerator body 1 from having a significant impact on the flame shape. The turbulence ring 12 used in the present invention is an indented structure located at the end of the horizontal cylinder, and has a trapezoidal cross section.

[0032] like Figure 1 and Figure 2 As shown, the exhaust gas inlet section 3 includes a second cooling fresh air inlet pipe 5, which is tilted downward and the pipe mouth of the second cooling fresh air inlet pipe 5 is aligned with the ramp plane of the exhaust gas flow channel rear section 7. The axis of the second cooling fresh air inlet pipe is parallel to the ramp plane of the exhaust gas flow channel rear section 7. The second cooling fresh air inlet pipe 5 has an equal inclination angle with the slope of the exhaust gas flow channel rear section, and the high-speed jet of cooling air can sweep the ramp in the exhaust gas flow channel rear section 7. The cross-section of the second cooling fresh air inlet pipe 5 can be circular, and it is tilted downward and inserted into the exhaust gas flow channel rear section 7. During the ash cleaning operation, fresh air can be directly used to blow the ramp of the exhaust gas flow channel rear section 7, and the ash that may exist on the ramp can be blown to the bottom of the incinerator, thereby reducing the frequency and difficulty of manual ash cleaning operations.

[0033] The cooling fresh air in the present invention can come from the outdoor air sucked by the cooling fan, and is divided into two parts and sent to the incinerator, one part is sent to the flame section 2 in a tangential direction, and the other part is sent to the exhaust gas inlet section 3.

[0034] The tail gas flow passage is provided with a tail gas cut-off valve for cutting off the gas passage between the upstream production equipment and the incinerator. The incinerator can have the function of independent operation after the upstream production equipment is offline. The overall structure of the valve can be a gate valve, which is manually operated. The valve preferably adopts an internal insulation design, and the internal insulation can be castable.

[0035] like Figure 4A As shown, the first end of the exhaust gas flow channel is provided with a flexible connection 8 for connecting with the exhaust gas outlet flange of the upstream production equipment, so as to facilitate the on-site installation and connection of the upstream production equipment and the incinerator; in addition, it can effectively absorb the expansion of the exhaust gas outlet of the upstream production equipment in the vertical direction and radial direction, and avoid the incinerator exhaust gas inlet section from being affected by stress. Figure 4A and Figure 4B As shown, the flexible connection body is divided into three parts, namely, an outer tube, an inner tube and a high-temperature resistant flexible coating material. The outer tube includes an outer tube wall 9 and a flange, and the outer tube is connected to the exhaust gas outlet of the upstream production equipment. The inner tube includes an inner tube wall 10, a flange, and a castable lining 14. The inner tube is connected to the interface of the exhaust gas flow channel of the incinerator. There is a ring plate at the bottom of the inner tube wall to support the castable lining. The diameter of the inner tube is smaller than that of the outer tube. During normal installation, the inner tube is inserted into the outer tube, the insertion depth is controlled within the design value, and the gap between the inner tube and the outer tube is controlled within the design value. The high-temperature resistant flexible coating material 11 is coated on the outer periphery of the inner tube and the outer tube to ensure that the visible parts of the inner tube and the outer tube are covered with high-temperature resistant flexible coating material. A metal rolling strip is used to tie one end of the high-temperature resistant flexible coating material to the outer wall of the inner tube, and the other end is fixed to the outer wall of the outer tube.

[0036] The inner and outer cylinders are independent of each other and can absorb the axial displacement caused by thermal expansion of the upstream production equipment and incinerators during normal operation. A certain gap is set between the inner and outer cylinders to absorb the radial displacement caused by thermal expansion. The high-temperature resistant flexible coating material coated on the outside of the cylinder has a certain flexibility and can withstand the relative displacement of the inner and outer cylinders. The high-temperature resistant flexible coating material is fixed with a rolled belt, which is convenient for regular replacement. In addition, since the combustion chambers of the upstream production equipment and incinerators are under negative pressure during normal operation, the high-temperature gas will not overflow from the gap between the inner and outer cylinders to the outside.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The dust-containing tail gas incinerator based on the present invention specifically involves two different working conditions: a normal operating condition and a purging condition.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] The present invention provides a simulation calculation of the operation of the incinerator to prove that the equipment meets the performance requirements, wherein the performance requirements are: 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 is reasonably configured.

[0045] The simulation calculations involve: Computational fluid dynamics method (CFD METHOD), the specific steps are: Calculate preliminary dimensions and interface dimensions based on design input parameters; Build geometric models; Establish a three-dimensional model of the incinerator, generate a topological model, set mesh parameters and generate meshes; Set basic model parameters, physical calculation model parameters, fluid medium parameters, boundary conditions, solver setting parameters, etc. in CFD simulation software; Run simulation calculations and obtain results; Post-process the simulation results and output a report.

[0046] In the above simulation calculation process, the design input parameters involved are as follows: (1) Exhaust parameters of upstream production equipment The gas composition of the tail gas from the upstream production equipment is shown in Table 1:

[0047] (2) Flame stage gas parameters The burner starts the gas according to the load demand and allocates the combustion-supporting air in proportion. Premixed combustion is carried out in the burner nozzle. The gas sent to the incinerator is the product of complete combustion of natural gas. The gas composition is calculated based on the theoretical gas flow rate and combustion-supporting air flow rate, as shown in Table 2 below.

[0048]

[0049] Calculation simulation results (1) Simulation results of incinerator process gas state parameters The various state parameters of the inlet and outlet gases of the incinerator are shown in Table 3.

[0050]

[0051] illustrate: The static pressure loss from the incinerator exhaust gas inlet to the incinerator outlet is 383Pa, and this static pressure difference can meet the operating needs of the downstream incinerator.

[0052] The cooling air is not turned on under normal operating conditions.

[0053] (2) Velocity distribution inside the incinerator The velocity distribution cloud diagram inside the incinerator is as follows Figure 5 shown.

[0054] (3) Velocity vector distribution of incinerator flame section and tail gas pipeline The velocity vector distribution of the incinerator flame section is as follows Figure 6 As shown, the velocity vector distribution of the inlet section of the incinerator tail gas is as follows Figure 7 shown.

[0055] (4) Distribution of flow field traces in the incinerator body The distribution of flow field traces at different angles in the incinerator body is as follows Figure 8 and Fig. 9 shown.

[0056] From the above results, it can be seen that a stable spiral upward airflow can be formed in the incinerator body, and the gas flow rate close to the inner wall of the incinerator body is greater than 25m / s. The large mass particles in the airflow are thrown to the inner wall of the reaction section under the action of centrifugal force, and fall to the ash collecting pipeline at the bottom under the action of gravity. The velocity component of the airflow close to the inner wall is very small in the vertical direction, and the effect on the downward movement of the particles is limited; the airflow in the incinerator body has a very limited effect on the airflow in the flame section, which can ensure the stability of the flow state in the flame section.

[0057] The beneficial effects of the present invention are: The dust-containing tail gas incinerator of the present invention can fully remove the combustible components in the tail gas and remove a large amount of dust in the tail gas, thereby effectively extending the life of downstream equipment and pipelines and reducing the maintenance cost of downstream equipment and pipelines; it also improves the convenience of manual dust cleaning during maintenance operations.

[0058] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may 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, and the second end of the exhaust gas flow channel is arranged to be tangent to the inner wall of the incinerator body.

2. The dust-containing tail gas incinerator according to claim 1, characterized in that: A turbulence ring is arranged at the end of the horizontal cylinder.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. The dust-containing tail gas incinerator according to claim 7, 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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