Rotary kiln dangerous waste incineration two combustion chamber multi-section refractory layer structure

Abstract

The application relates to the technical field of boiler equipment, and discloses a two-burner multi-section refractory layer structure for a rotary kiln hazardous waste incinerator, which comprises an outer furnace body, the inner wall of the outer furnace body is internally provided with a gas protection assembly for air film soft protection of the inner wall of the equipment; the gas protection assembly comprises an inner pipe coaxially fixed on the inner wall of the outer furnace body, a plurality of groups of fixing blocks are arranged on the inner wall of the outer furnace body and located above the inner pipe, and an exhaust outer pipe is fixedly arranged at the position, the inner wall of the exhaust outer pipe and the outer wall at the top end pipe body of the inner pipe jointly form a first annular gap air channel. The equipment is provided with an air inlet ring pipe, a bifurcated pipe, a spray ring, a flow guide cover, an inner pipe and an exhaust outer pipe, high-pressure gas is branched and guided to form first, second and third air films close to the corresponding inner walls, the equipment inner wall is specially isolated from material adhesion, clean protection of the equipment inner wall is realized, faults caused by adhesion blockage or corrosion are reduced, and the maintenance frequency is reduced.

Description

Technical Field

[0001] This invention relates to the field of boiler equipment technology, and in particular to a multi-section refractory layer structure for a secondary combustion chamber in a rotary kiln for hazardous waste incineration. Background Technology

[0002] Biomass fuel heating is an important way of utilizing clean energy. The manufacturing of biomass combustion boilers and related equipment, such as furnaces, melting furnaces, and electric furnaces, is the core to ensure stable heating. The secondary combustion chamber, as a key component for treating rotary kiln and boiler exhaust gas, plays a role in purifying flue gas and ensuring complete combustion. When the secondary combustion chamber is running, the exhaust gas from the rotary kiln and boiler carries highly corrosive gaseous substances, unburned solid particles, and ash. These substances react at high temperatures to form sticky deposits, which are easily adsorbed onto the inner wall of the secondary combustion chamber due to dead angles and sudden changes in flue gas flow. They accumulate continuously, especially at the kiln opening, constriction, inverted cone, and flue corners. The thickening of the deposits can block the flue gas passage and cause uneven airflow, which not only affects the stability of biomass fuel heating but may also cause environmental risks. Furthermore, the stress of the deposits can exacerbate the cracking and peeling of the refractory layer on the inner wall. To avoid this problem, it is necessary to shut down the machine regularly for cleaning. The traditional method is to shut down the machine and cool it down, then workers open the cleaning manhole and manually knock off the deposits with tools such as pneumatic picks and steel bars.

[0003] However, the above-mentioned treatment of the deposits on the inner wall of the secondary combustion chamber still has the following shortcomings: First, due to the high corrosiveness of some incinerated materials and the high operating temperature, substances easily adhere to the inner wall of the secondary combustion chamber. When cleaning, the equipment must be shut down first, and the internal temperature must be allowed to drop to a safe range before cleaning personnel can manually knock off the deposits with tools such as pneumatic picks and steel bars. This manual cleaning method is inefficient and poses safety risks such as high temperature residue and contact with chemical substances. At the same time, during the forceful knocking process, it is very easy for the deposits to adhere to the aluminum silicate fiber cotton, lightweight insulation material, ordinary castable and other refractory materials on the inner wall and fall off, damaging the integrity and sealing insulation of the refractory materials, causing the refractory layer to be uneven, which in turn aggravates the subsequent accumulation of sticky deposits, forming a vicious cycle and ultimately shortening the service life of the equipment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing rotary kiln requires the machine to be stopped and cooled down before manual cleaning, which is inefficient and poses a safety risk. It is also easy for the internal refractory material to be damaged and fall off, which will aggravate the accumulation and shorten the service life of the equipment. To this end, we propose a multi-section refractory layer structure for the secondary combustion chamber of a rotary kiln for hazardous waste incineration.

[0005] To achieve the above objectives, this application adopts the following technical solution: a multi-section refractory layer structure for a secondary combustion chamber of a rotary kiln for hazardous waste incineration, including an outer furnace body, wherein an air-proof component for providing air-film soft protection to the inner wall of the equipment is installed and fixed inside the outer furnace body. The gas protection component includes an inner tube coaxially fixed to the inner wall of the outer furnace body. An outer exhaust pipe is fixedly installed on the inner wall of the outer furnace body above the inner tube by multiple sets of fixing blocks. The inner wall of the outer exhaust pipe and the outer wall at the top of the inner tube together form a first annular seam air passage. The outer wall of the outer exhaust pipe and the inner wall of the outer furnace body together form a second annular seam air passage. The first and second annular seam air passages are connected to form an annular pipe air passage. A flow guide is fixed on the inner wall of the outer furnace body below the inner tube. The curved outer wall of the flow guide, together with the inner walls of the outer furnace body and the inner tube, forms an annular wall air passage. A spray ring is coaxially fixed on the lower surface of the outer exhaust pipe at the junction of the first and second annular seam air passages. The inner tube is equipped with a gas guide component for simultaneously supplying high-pressure gas to both the annular gas passage and the annular wall gas passage.

[0006] Preferably, the gas guiding component includes an air inlet ring pipe fixed to the outer wall of the outer furnace body. The outer wall of the air inlet ring pipe near the axis is connected to multiple branch pipes at equal angles. The branch pipes penetrate the outer furnace body and extend into the inner tube.

[0007] Preferably, one side port of the bifurcation pipe is connected to the inner cavity of the spray ring, and the other side port of the bifurcation pipe is connected to the ring wall air passage. The outer wall of the air intake ring pipe has an air inlet for connecting to the output end of an external air supply device.

[0008] Preferably, the inner wall of the inner tube has a funnel-shaped cross-section, and the outer diameter of the nozzle at the top of the inner tube is smaller than the outer diameter of the exhaust pipe.

[0009] Preferably, the outer wall of the inner tube is provided with multiple sets of first spiral patterns arranged at equal angles, and the inner wall of the exhaust pipe is provided with multiple sets of second spiral patterns arranged at equal angles, with the first and second spiral patterns interlacing and intersecting each other, and the outer wall of the tube body at the top of the inner tube is parallel to the inner wall of the exhaust pipe.

[0010] Preferably, the top outer wall of the outer furnace body is provided with a variable diameter section, which includes a first contraction section, a smooth section and an expansion section, and the bottom end of the flue gas pipe is provided with a second contraction section, wherein the first contraction section and the second contraction section are parallel.

[0011] Preferably, the bottom outer wall of the flow guide shroud is parallel to the inner wall of the outer furnace body, and the top annular outer wall of the outer furnace body is parallel to the top inner wall of the inner tube.

[0012] Preferably, the opening on the inner wall of the spray ring corresponds vertically to the inclined surface of the second contraction section.

[0013] Preferably, a flange is installed on the outer wall of the top end of the flue gas outer pipe, and the outer diameter of the top end of the flue gas outer pipe is larger than the outer diameter of the top end of the outer furnace body.

[0014] Preferably, a flue gas inlet section is obliquely inserted into one side of the outer wall at the bottom of the outer furnace body, and a slag removal port is opened on one side of the outer wall at the bottom of the outer furnace body.

[0015] The technical effects and advantages of this invention are as follows: In this invention, the device uses an inlet ring pipe, a branch pipe, a spray ring, a flow guide, an inner pipe, and an exhaust pipe to guide high-pressure gas into streams, forming a first gas film, a second gas film, and a third gas film that closely adhere to the corresponding inner wall. This is specifically designed to prevent substances from adhering to the inner wall of the device, thereby achieving clean protection of the inner wall, reducing malfunctions caused by blockage or corrosion from deposits, and lowering the frequency of inspection and maintenance.

[0016] In this invention, the device utilizes an air inlet ring pipe, a flow guide, a burner, a ring pipe air duct, and refractory materials. It employs an air film to assist the refractory materials in heat insulation and increase the oxygen content inside the device. In conjunction with the burner, it achieves complete combustion of flue gas. Relying on the Bernoulli effect, it guides the self-circulation of fresh air, thereby achieving enhanced heat insulation efficiency of the refractory materials and purification of flue gas, extending the service life of the refractory materials, and reducing overall operating energy consumption and costs. Attached Figure Description

[0017] The disclosure of this invention 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 invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the overall external structure of the present invention; Figure 3 This is a cross-sectional schematic diagram of the outer furnace body structure of the present invention; Figure 4 This is a cross-sectional schematic diagram of the outer tube structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of the inner tube, spray ring, and intake ring pipe structure of the present invention. Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 7 This is a detailed schematic diagram of the air deflector structure of the present invention; Figure 8 This is a cross-sectional schematic diagram of the device structure of the present invention; Figure 9 This is a schematic cross-sectional view of the device structure of the present invention.

[0018] Legend: 1. Outer furnace body; 11. Smoke inlet section; 12. Slag removal port; 2. Gas protection component; 21. Inner pipe; 211. First spiral pattern; 22. Air inlet ring pipe; 221. Branch pipe; 23. Spray ring; 24. Exhaust pipe; 241. Second spiral pattern; 25. Flow guide hood. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] Reference Figure 1-9 As shown, the present invention provides a technical solution: a multi-section refractory layer structure for the secondary combustion chamber of a rotary kiln for hazardous waste incineration, including an outer furnace body 1. The outer wall of the outer furnace body 1 is made of metal, and the inner wall is lined with refractory material up to 400mm thick, including 30mm thick aluminum silicate fiber cotton, 150mm lightweight insulation material, and 220mm ordinary castable material, which is specially designed to cope with highly corrosive incineration materials and high temperatures in the rotary kiln, and to isolate high temperatures and various hazardous chemicals. An air protection component 2 for providing air film soft protection for the inner wall of the equipment is installed and fixed inside the outer furnace body 1. The gas protection component 2 includes an inner tube 21 coaxially fixed to the inner wall of the outer furnace body 1. An exhaust pipe 24 is fixedly installed on the inner wall of the outer furnace body 1 above the inner tube 21 by multiple sets of fixing blocks. The inner wall of the exhaust pipe 24 and the outer wall of the top of the inner tube 21 together form a first annular gas channel. The outer wall of the exhaust pipe 24 and the inner wall of the outer furnace body 1 together form a second annular gas channel. The first and second annular gas channels are connected to form an annular gas channel. A guide hood 25 is fixed on the inner wall of the outer furnace body 1 below the inner tube 21. The curved outer wall of the guide hood 25 together with the inner walls of the outer furnace body 1 and the inner tube 21 together form an annular wall gas channel. A spray ring 23 is coaxially fixed on the lower surface of the exhaust pipe 24 at the junction of the first and second annular gas channels. The inner tube 21 is equipped with a gas guide component for simultaneously supplying high-pressure gas to the annular gas passage and the annular wall gas passage.

[0021] The output end of the external air supply device is fixed to the flange at the air inlet on the outer wall of the air inlet ring pipe 22. When the external air supply device is started, high-pressure gas is injected into the air inlet ring pipe 22. Then, one of the high-pressure airflows enters the spray ring 23 through one end interface of the multi-component branch pipe 221 and is sprayed vertically upward. This high-pressure airflow is sprayed upward close to the inner wall of the exhaust pipe 24. After being doubly restricted by the inner wall of the exhaust pipe 24 and the outer wall of the inner pipe 21, an annular first air film is formed. The first air film can protect the inner wall of the exhaust pipe 24. The continuously sprayed first air film can block the adhesion of sticky deposits and keep the inner wall of the exhaust pipe 24 relatively clean. Another high-pressure airflow enters the annular gas channel through the other end of the bifurcation pipe 221. This high-pressure airflow is dispersed by the impact of the guide shroud 25 to form annular airflows in two directions. One annular airflow flows downward and sprays vertically downward close to the inner wall of the outer furnace body 1 to form a second gas film. The other annular airflow flows downward and sprays vertically upward close to the inner wall of the inner tube 21 to form a third gas film. As described in the principle of the first gas film, the second gas film and the third gas film respectively provide gas soft protection for the bottom inner wall of the outer furnace body 1 and the inner wall of the top tube of the inner tube 21 to isolate sticky adhering substances. It should be noted that the lower surface of the deflector 25 is equipped with multiple sets of burners arranged in an equiangular array, which can keep the internal temperature of the secondary combustion chamber stable above 1100℃ and can spray flame jets to ignite the continuously rising flue gas. Multiple sets of thermal sensors are installed at equal angles at the top of the inner wall of the flow guide 25, and the time for the flue gas to pass through the inner wall of the flow guide 25 upward is greater than two seconds, thereby achieving complete combustion of the flue gas. This is existing technology, so it will not be described in detail. Finally, under the combined impact of the first, second, and third gas films, the oxygen content inside the equipment increases, and combustion becomes more complete. Because of the continuous injection of high-pressure and high-speed gas, the gas pressure inside the outer furnace body 1 and in the cavity below the inner tube 21 increases. At this time, the high-pressure airflow carries the flue gas in the combustion state and continuously sprays it upward along the inner wall of the guide hood 25. At this time, due to the Bernoulli effect (which is existing technology, so I will not elaborate further), a certain negative pressure is generated at the opening above the second annular seam gas channel. After the equipment has been running for a certain period of time, the air supply rate of the external air supply equipment can be slowed down to serve as an auxiliary airflow. At this time, due to the continuous jet of flame, a negative pressure is generated above the second annular slit air passage. Since the annular air passage is a connected structure, fresh air from the outside will be continuously drawn in. When the newly entered air travels to the bend of the annular air passage, the fresh air is continuously carried upward by the airflow jetted by the external air supply equipment, thereby realizing the self-circulation of the external gas. This can reduce the energy consumption of the external air supply equipment to a certain extent and reduce operating costs. It should be noted that the annular airway consists of a first annular slit airway and a second annular slit airway, and its cross-sectional shape is U-shaped.

[0022] Reference Figure 3-9 As shown in this embodiment: the gas guiding component includes an air inlet ring pipe 22 fixed to the outer wall of the outer furnace body 1. Multiple branch pipes 221 are connected in an equiangular array on the outer wall of the side of the air inlet ring pipe 22 near the axis. The branch pipes 221 penetrate the outer furnace body 1 and extend into the inner pipe 21.

[0023] One side of the branch pipe 221 is connected to the inner cavity of the spray ring 23. The high-pressure airflow is sprayed vertically upward through the guide of the spray ring 23. The other side of the branch pipe 221 is connected to the ring wall air passage. The outer wall of the air inlet ring pipe 22 has an air inlet for connecting with the output end of the external air supply equipment. Specifically, the air inlet is equipped with a flange that facilitates docking with the output end of the external air supply equipment.

[0024] Reference Figure 3-9 As shown in this embodiment: the inner wall cross-section of the inner tube 21 is funnel-shaped, and the outer diameter of the nozzle at the top of the inner tube 21 is smaller than the outer diameter of the exhaust pipe 24.

[0025] The outer wall of the inner tube 21 is provided with multiple sets of first spiral patterns 211 arranged at equal angles, and the inner wall of the exhaust pipe 24 is provided with multiple sets of second spiral patterns 241 arranged at equal angles. The first spiral patterns 211 and the second spiral patterns 241 interweave and overlap each other. The outer wall of the tube body at the top of the inner tube 21 is parallel to the inner wall of the exhaust pipe 24.

[0026] The first spiral pattern 211 and the second spiral pattern 241 interweave to form multiple spiral spaces. The first air film passing through the first annular slit air passage is separated by multiple sets of spiral spaces to form a spiral airflow, which further restricts the flow direction and position of the first air film, so that the first air film is closely attached to the inner wall of the exhaust pipe 24, indirectly improving the isolation effect on sticky deposits.

[0027] Reference Figure 1-9 As shown in this embodiment: the top outer wall of the outer furnace body 1 is provided with a variable diameter section, which includes a first contraction section, a smooth section and an expansion section, and the bottom end of the flue gas pipe 24 is provided with a second contraction section, and the first contraction section and the second contraction section are parallel to each other.

[0028] The bottom outer wall of the flow guide hood 25 is parallel to the inner wall of the outer furnace body 1, and the top annular outer wall of the outer furnace body 1 is parallel to the top inner wall of the inner tube 21.

[0029] The opening on the inner wall of the spray ring 23 corresponds vertically to the inclined surface of the second contraction section; During the vertical upward spraying process, the first air film impacts the inclined surface of the second contraction section. Guided by the inclined surface of the second contraction section, the first air film is guided into the spiral space formed by the first spiral pattern 211, the second spiral pattern 241, the outer wall of the inner tube 21, and the inner wall of the exhaust pipe 24.

[0030] Reference Figure 1-9 As shown in this embodiment: a flange is installed on the outer wall of the top of the flue gas outer pipe 24, and the outer diameter of the top of the flue gas outer pipe 24 is larger than the outer diameter of the top of the outer furnace body 1. The outer diameter of the top end of the flue gas pipe 24 is larger than the outer diameter of the top end of the outer furnace body 1, which can protect and block the upper opening of the first annular seam gas passage, reduce the entry of dust and debris into the first annular seam gas passage and block the internal passage of the equipment, thereby reducing the failure rate of the equipment to a certain extent. Meanwhile, the flange at the top of the flue gas outer pipe 24 is connected and fixed to the waste heat boiler to maximize heat utilization.

[0031] A flue gas inlet section 11 is obliquely inserted into one side of the outer wall at the bottom of the outer furnace body 1. The flue gas inlet section 11 is connected to the exhaust gas outlet of the rotary kiln. A slag cleaning port 12 is opened on one side of the outer wall at the bottom of the outer furnace body 1. The slag cleaning port 12 can be connected to the slag removal machine to receive the ash and slag produced after combustion, and can also be used by cleaning personnel to enter the equipment for cleaning and maintenance.

[0032] Working principle: First, the external air supply equipment is fixed to the flange of the air inlet ring pipe 22. After starting, high-pressure gas is injected into the air inlet ring pipe 22. Then, the high-pressure gas is divided into two streams. One stream enters the spray ring 23 through the bifurcation pipe 221 and is sprayed vertically upward. It flows closely against the inner wall of the exhaust pipe 24. The first air film is formed by the restriction between the inner wall of the exhaust pipe 24 and the outer wall of the inner pipe 21. This can prevent sticky deposits from adhering to the inner wall of the exhaust pipe 24 and keep the inner wall of the exhaust pipe 24 clean. At the same time, the high-speed and continuous flow of the air film has a certain heat insulation effect, which helps the refractory material to perform heat insulation, reduces the degree of heat of the refractory material, and can extend the service life of the refractory material to a certain extent and reduce the cost of maintenance and replacement. Secondly, another stream of high-pressure gas enters the annular gas channel through the branch pipe 221. After being impacted by the guide shroud 25, it disperses into two annular airflows. One stream adheres closely to the inner wall of the outer furnace body 1 and sprays downwards to form a second gas film; the other stream adheres closely to the inner wall of the inner tube 21 and sprays upwards to form a third gas film. As described above, the second and third gas films protect the bottom inner wall of the outer furnace body 1 and the top inner wall of the inner tube 21, respectively, isolating them from sticky deposits. Simultaneously, the high-speed, continuously flowing gas films provide a certain degree of insulation, reducing the impact of high temperatures on the bottom of the outer furnace body 1 and the top of the inner tube 21. At the same time, the burner on the guide shroud 25 sprays a flame jet to ignite the rising flue gas. A thermal sensing device ensures complete combustion of the flue gas. The first, second, and third gas films together increase the oxygen content inside the equipment, promoting more complete combustion. Following this, the continuous injection of high-pressure gas increases the air pressure in the cavity below the inner tube 21, and the airflow carries the combustion gases... The flue gas is ejected upward along the inner wall of the guide hood 25. Due to the Bernoulli effect, a negative pressure is generated above the opening of the second annular slit air passage. After the equipment has been running for a period of time, the air supply rate of the external air supply equipment can be slowed down, and only the auxiliary airflow is retained as the driving airflow. The continuous flame jet keeps the negative pressure above the second annular slit air passage. The connecting structure of the annular air passage allows fresh air from the outside to be continuously drawn in. When it travels to the bend of the annular air passage, it is carried upward by the auxiliary airflow, realizing gas self-circulation, reducing the overall energy consumption of the equipment and reducing operating costs. Next, when the first gas film is ejected upward, it hits the inclined surface of the second contraction section at the bottom of the exhaust pipe 24. After being guided, it enters the spiral space formed by the first spiral pattern 211 and the second spiral pattern 241, forming a spiral airflow. This further adheres to the inner wall of the exhaust pipe 24, strengthening the isolation effect of sticky deposits. At the same time, the spirally flowing gas film continues to maintain a high speed, making the heat insulation effect more stable.

[0033] The technical scope of this invention 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 invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A two-chamber multi-stage refractory lining structure for a rotary kiln hazardous waste incinerator, characterized by, Includes an outer furnace body, and an air-proof component for providing air-film soft protection for the inner wall of the equipment is installed and fixed inside the outer furnace body; The gas protection component includes an inner tube coaxially fixed to the inner wall of the outer furnace body. An outer exhaust pipe is fixedly installed on the inner wall of the outer furnace body above the inner tube by multiple sets of fixing blocks. The inner wall of the outer exhaust pipe and the outer wall at the top of the inner tube together form a first annular seam air passage. The outer wall of the outer exhaust pipe and the inner wall of the outer furnace body together form a second annular seam air passage. The first and second annular seam air passages are connected to form an annular pipe air passage. A flow guide is fixed on the inner wall of the outer furnace body below the inner tube. The curved outer wall of the flow guide, together with the inner walls of the outer furnace body and the inner tube, forms an annular wall air passage. A spray ring is coaxially fixed on the lower surface of the outer exhaust pipe at the junction of the first and second annular seam air passages. The inner tube is equipped with a gas guiding component for simultaneously supplying high-pressure gas to both the annular air passage and the annular wall air passage. The gas guiding component includes an air inlet ring pipe fixed to the outer wall of the outer furnace body. Multiple branch pipes are connected in an equiangular array on the outer wall of the air inlet ring pipe near the axis. The branch pipes penetrate the outer furnace body and extend into the inner tube. One side port of the branch pipe is connected to the inner cavity of the spray ring, and the other side port of the branch pipe is connected to the ring wall gas passage. The outer wall of the air inlet ring pipe has an air inlet for connecting to the output end of the external gas supply equipment.

2. A rotary kiln hazardous waste incineration two combustion chamber multi-stage refractory lining structure according to claim 1, characterized in that: The inner wall of the inner tube has a funnel-shaped cross-section, and the outer diameter of the nozzle at the top of the inner tube is smaller than the outer diameter of the exhaust pipe.

3. A multi-stage refractory lining structure for a secondary combustion chamber of a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The outer wall of the inner tube is provided with multiple sets of first spiral patterns arranged at equal angles, and the inner wall of the exhaust pipe is provided with multiple sets of second spiral patterns arranged at equal angles. The first and second spiral patterns interweave with each other, and the outer wall of the tube body at the top of the inner tube is parallel to the inner wall of the exhaust pipe.

4. A multi-stage refractory lining structure for a secondary combustion chamber of a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The outer wall at the top of the outer furnace body is provided with a variable diameter section, which includes a first contraction section, a smooth section and an expansion section, and the bottom end of the flue gas pipe is provided with a second contraction section, wherein the first contraction section and the second contraction section are parallel to each other.

5. A multi-stage refractory lining structure for a secondary combustion chamber of a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The bottom outer wall of the flow guide shroud is parallel to the inner wall of the outer furnace body, and the top annular outer wall of the outer furnace body is parallel to the top inner wall of the inner tube.

6. A multi-stage refractory lining structure for a secondary combustion chamber of a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: The opening on the inner wall of the spray ring corresponds vertically to the inclined surface of the second contraction section.

7. The multi-section refractory layer structure for a secondary combustion chamber in a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: A flange is installed on the outer wall of the top of the flue gas pipe, and the outer diameter of the top of the flue gas pipe is larger than the outer diameter of the top of the outer furnace body.

8. The multi-section refractory layer structure for a secondary combustion chamber in a rotary kiln for hazardous waste incineration according to claim 1, characterized in that: A flue gas inlet section is obliquely inserted into one side of the outer wall at the bottom of the outer furnace body, and a slag removal port is opened on one side of the outer wall at the bottom of the outer furnace body.

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