Oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment

Abstract

The invention belongs to the technical field of oxygen-enriched combustion of rotary kilns, and relates to an oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment, which comprises an inner sleeve component and an outer sleeve component which are coaxially sleeved, and a gas channel is formed between the inner sleeve component and the outer sleeve component. The outer sleeve assembly comprises a first outer cylinder and a second outer cylinder which are coaxially arranged in a sleeved mode, and an outer air channel is formed between the first outer cylinder and the second outer cylinder. The inner sleeve assembly comprises a first inner cylinder and a second inner cylinder which are coaxially arranged in a sleeved mode, the first inner cylinder is located in the second inner cylinder, and an inner air channel is formed between the first inner cylinder and the second inner cylinder. Flexible adjustment of the concentration and the position of oxygen-enriched gas in the whole circumferential direction is achieved, then flames are controlled to form a proper flow field, an atmosphere field and a temperature field in the circumferential direction, control over the temperature in the rotary kiln is facilitated, combustion reaction is conducted in the high-temperature and high-oxygen environment, harmful substances are converted into harmless gas or solid products, and the combustion efficiency is improved. Meanwhile, combustion-supporting gas is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oxy-fuel combustion in rotary kilns, and particularly relates to an oxy-fuel distribution adjustable rotary kiln burner for hazardous waste treatment. Background Art

[0002] In the current field of hazardous waste treatment, combustion disposal technology has always been one of the main treatment methods. The traditional combustion process usually relies on oxygen in the air to provide the oxidant required for fuel combustion. However, this method has a series of problems, including but not limited to low combustion efficiency, difficult temperature control, low energy utilization rate, and a large amount of pollutant emissions.

[0003] In response to these problems, oxy-fuel combustion technology has been proposed and received extensive attention. This technology injects oxygen-rich gas into the combustion process to increase the oxygen concentration, thereby enhancing the combustion efficiency of the fuel, increasing the combustion temperature, reducing harmful gas emissions in the flue gas, and minimizing energy consumption by reducing the entry of nitrogen through oxy-fuel combustion. However, in the treatment of hazardous waste, the existing oxy-fuel combustion technology still has some limitations, such as uneven temperature during the combustion process, incomplete combustion caused by lack of oxygen in some areas, and uncontrollable temperature. These problems may lead to unstable emissions and reduced waste treatment efficiency.

[0004] Therefore, it is necessary to propose a new technology for synergistically treating hazardous waste by oxy-fuel combustion. This technology will combine the characteristics of hazardous waste and the requirements of the combustion process, design and optimize the burner structure, adjust the oxygen supply, and may introduce other auxiliary measures to ensure the high efficiency and stability of the combustion process, and minimize harmful gas emissions and secondary pollution of waste. The research and development of this technology will bring a major technological breakthrough to the field of hazardous waste treatment and promote the industry to move towards a more environmentally friendly and efficient direction. Summary of the Invention

[0005] The object of the present invention is to propose an oxy-fuel distribution adjustable rotary kiln burner for hazardous waste treatment to solve the technical problems existing in the prior art; the technical solutions adopted to achieve the above object are:

[0006] An oxygen-rich distribution adjustable rotary kiln burner for hazardous waste treatment, comprising an inner sleeve assembly and an outer sleeve assembly sleeved coaxially, wherein a gas channel is formed between the inner sleeve assembly and the outer sleeve assembly. The outer sleeve assembly includes a first outer cylinder and a second outer cylinder sleeved coaxially, the first outer cylinder is located inside the second outer cylinder, and an outer air channel is formed between the first outer cylinder and the second outer cylinder; the inner sleeve assembly includes a first inner cylinder and a second inner cylinder sleeved coaxially, the first inner cylinder is located inside the second inner cylinder, and an inner air channel is formed between the first inner cylinder and the second inner cylinder. A central air channel and an ignition port are arranged inside the first inner cylinder, and oxygen-rich air or ordinary air is injected into the outer air channel and / or the inner air channel.

[0007] Preferably, two first partition plates are arranged on the outer wall of the first outer cylinder along the axial direction to divide the outer air channel into an upper semi-circular outer air channel and a lower semi-circular outer air channel that are isolated from each other. A first arc-shaped air resistance block is arranged at the inner end of the upper semi-circular outer air channel, and the first arc-shaped air resistance block is fixed on the outer wall of the first outer cylinder; a second arc-shaped air resistance block is arranged on the inner wall of the second outer cylinder. When the second outer cylinder moves along the axial direction, the size of the air flow in the upper semi-circular outer air channel is controlled by the distance between the first arc-shaped air resistance block and the second arc-shaped air resistance block.

[0008] Preferably, the height of the first arc-shaped air resistance block gradually increases along the air flow direction in the outer air duct; the second arc-shaped air resistance block is fixed at the upper semi-circular part of the inner wall of the second outer cylinder, and the height of the second arc-shaped air resistance block gradually decreases along the air flow direction in the outer air duct.

[0009] Preferably, when the first arc-shaped air resistance block and the second arc-shaped air resistance block approach each other, the air duct formed between them gradually narrows until they are closely attached to each other to seal the upper semi-circular outer air channel.

[0010] Preferably, two second partition plates are arranged on the outer wall of the first inner cylinder along the axial direction to divide the inner air channel into an upper semi-circular inner air channel and a lower semi-circular inner air channel that are isolated from each other. A third arc-shaped air resistance block is arranged at the inner end of the lower semi-circular inner air channel, and the third arc-shaped air resistance block is fixed on the outer wall of the first inner cylinder; a fourth arc-shaped air resistance block is arranged on the inner wall of the second inner cylinder. When the second inner cylinder moves along the axial direction, the size of the air flow in the lower semi-circular inner air channel is controlled by the distance between the third arc-shaped air resistance block and the fourth arc-shaped air resistance block.

[0011] Preferably, the height of the third arc-shaped air resistance block gradually increases along the air flow direction in the inner air duct; the fourth arc-shaped air resistance block is fixed at the lower semi-circular part of the inner wall of the second inner cylinder, and the height of the fourth arc-shaped air resistance block gradually decreases along the air flow direction in the inner air duct.

[0012] Preferably, when the third arc-shaped air resistance block and the fourth arc-shaped air resistance block approach each other, the air duct formed between them gradually narrows until they are closely attached to each other to seal the lower semi-circular inner air channel.

[0013] Preferably, a first power mechanism for driving the second outer cylinder to move along the axial direction is further provided.

[0014] Preferably, a second power mechanism for driving the second inner cylinder to move along the axial direction is further provided.

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

[0016] (1) In the present invention, the first hydraulic cylinder drives the second outer cylinder 1 to move along the axial direction. Under the mutual cooperation of the first arc-shaped air resistance block 10 and the second arc-shaped air resistance block 11, the rapid adjustment of the air flow in the upper semi-circular outer air passage or its closing state can be realized.

[0017] (2) By driving the second inner cylinder 5 to move along the axial direction through the second hydraulic cylinder, under the mutual cooperation of the third arc-shaped air resistance block 13 and the fourth arc-shaped air resistance block 12, the rapid adjustment of the air flow in the lower semi-circular inner air passage or its closing state can be realized.

[0018] (3) Through the mutual cooperation of the opening and closing ratios between the above two, the flexible adjustment of the concentration, position, and distribution of the oxygen-rich gas in the entire circumferential direction can be realized, thereby controlling the combustion state of the flame in the circumferential direction and the temperature distribution, greatly improving the combustion efficiency, also improving the utilization efficiency of oxygen enrichment and saving energy.

[0019] (4) In the present invention, a temperature sensor and a pressure sensor are also equipped in the kiln head to monitor the temperature and pressure inside the kiln head in real time, and then feedback this information to the total control system. Furthermore, through the cooperation between the above two, the concentration, position, and distribution of the internal oxygen-rich gas are adjusted in real time, so as to achieve uniform temperature distribution during the combustion process and greatly improve the waste treatment efficiency. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the nozzle of the present invention;

[0021] Figure 2 is Figure 1 the sectional view along the line A-A in

[0022] Figure 3 is Figure 2 the sectional view along the line B-B in

[0023] Figure 4 It is a diagram of the use state of the present invention. Detailed Embodiments

[0024] The present invention will be further described below with reference to the drawings.

[0025] AsFigure 1 and Figure 2 As shown in Figure 2 , the present invention includes an inner sleeve assembly and an outer sleeve assembly which are coaxially sleeved. A gas channel 4 is formed between the inner sleeve assembly and the outer sleeve assembly. The outer sleeve assembly includes a first outer cylinder 3 and a second outer cylinder 1 which are coaxially sleeved. The first outer cylinder 3 is located inside the second outer cylinder 1, and an outer air channel 2 is formed between the first outer cylinder 3 and the second outer cylinder 1. The inner sleeve assembly includes a first inner cylinder 7 and a second inner cylinder 5 which are coaxially sleeved. The first inner cylinder 7 is located inside the second inner cylinder 5, and an inner air channel 6 is formed between the first inner cylinder 7 and the second inner cylinder 5. A central air channel 9 and an ignition port 8 are provided inside the first inner cylinder 7. Oxygen-rich air or ordinary air is injected into the outer air channel 2 and / or the inner air channel 6, and an ignition auxiliary fuel can also be injected into the central air channel 9.

[0026] As Figure 2 and Figure 3 As shown in Figure 3 , two first partition plates 20 are arranged on the outer wall of the first outer cylinder 3 along the axial direction, dividing the outer air channel 2 into an upper semi-circular outer air channel and a lower semi-circular outer air channel which are isolated from each other. The first partition plate 20 is in sealed sliding connection with the inner wall of the second outer cylinder 1. The outer end of the first partition plate 20 is located at the nozzle, and the inner end of the first partition plate 20 is connected to a first arc-shaped air resistance block 10. A first arc-shaped air resistance block 10 is provided at the inner end of the upper semi-circular outer air channel, and a second arc-shaped air resistance block 11 is provided on the inner wall of the second outer cylinder 1. When the second outer cylinder 1 moves along the axial direction, the size of the air flow in the upper semi-circular outer air channel is controlled by the distance between the first arc-shaped air resistance block 10 and the second arc-shaped air resistance block 11. The height of the first arc-shaped air resistance block 10 gradually increases along the air flow direction in the outer air channel 2. The second arc-shaped air resistance block 11 is fixed at the upper semi-circular part of the inner wall of the second outer cylinder 1, and the height of the second arc-shaped air resistance block 11 gradually decreases along the air flow direction in the outer air channel 2. When the first arc-shaped air resistance block 10 and the second arc-shaped air resistance block 11 approach each other, the air duct formed between them gradually narrows until they are closely attached to each other, completely sealing the upper semi-circular outer air channel.

[0027] As Figure 2 and Figure 3As shown in the figure, two second partitions 21 arranged along the axial direction are provided on the outer wall of the first inner cylinder 7, and the inner air passage 6 is divided into an upper semi-circular inner air passage and a lower semi-circular inner air passage that are isolated from each other. The outer end of the second partition 21 is located at the nozzle, and the inner end of the second partition 21 is connected to the third arc-shaped air resistance block 13. A third arc-shaped air resistance block 13 is provided at the inner end of the lower semi-circular inner air passage. The third arc-shaped air resistance block 13 is fixed to the first inner cylinder 7. A fourth arc-shaped air resistance block 12 is provided on the inner wall of the second inner cylinder 5. When the second inner cylinder 5 moves along the axial direction, the size of the air flow in the lower semi-circular inner air passage is controlled by the distance between the third arc-shaped air resistance block 13 and the fourth arc-shaped air resistance block 14. The height of the third arc-shaped air resistance block 13 gradually increases along the air flow direction in the inner air duct; the fourth arc-shaped air resistance block 12 is fixed at the lower semi-circular part of the inner wall of the second inner cylinder, and the height of the fourth arc-shaped air resistance block 12 gradually decreases along the air flow direction in the inner air duct; when the third arc-shaped air resistance block 13 and the fourth arc-shaped air resistance block 12 approach each other, the air duct formed between the two gradually narrows until they are in close contact with each other to completely seal the lower semi-circular inner air passage.

[0028] As Figure 2 shown, a first hydraulic cylinder 15 for driving the second outer cylinder 1 to move along the axial direction is also provided. Specifically, a first corrugated telescopic section 16 is provided at the end of the second outer cylinder 1. A first connecting ear 14 is provided on the outer wall of the second outer cylinder 1. The piston rod of the first hydraulic cylinder 15 is hinged to the first connecting ear 14, so as to drive the second outer cylinder 1 to move along the axial direction.

[0029] As Figure 2 shown, a second hydraulic cylinder 18 for driving the second inner cylinder 5 to move along the axial direction is also provided. Specifically, a second corrugated telescopic section 19 is provided at the end of the second inner cylinder 5. A second connecting ear 17 is provided on the outer wall of the second inner cylinder 5. The piston rod of the second hydraulic cylinder 18 is hinged to the second connecting ear 17, so as to drive the second inner cylinder 5 to move along the axial direction.

[0030] As Figure 4 shown, during operation, the rotary kiln burner 24 of the present invention is located at an eccentric position at the head of the rotary kiln body 22. A feed inlet 26 is provided beside the rotary kiln burner 24. A waste liquid spray gun head 27 is provided obliquely above the rotary kiln burner 24. At the same time, a support frame 30 extending into the interior of the rotary kiln body 22 is provided in the kiln head. A temperature detection head 28 and a pressure sensing head 29 are symmetrically installed on the support frame 30. The rotary kiln body 22 slowly rotates counterclockwise along the arrow 23. The waste 25 to be treated inside it is mainly concentrated at the bottom of the rotary kiln body 22 and is slightly biased towards the rotation direction of the rotary kiln body 22. At the initial ignition state, an ignition combustion improver is injected into the central air passage 9, and oxygen-enriched air is injected into the outer air passage 2 and the inner air passage 6 to start combustion as soon as possible.

[0031] As Figure 2 shown, the first hydraulic cylinder 15 drives the second outer cylinder 1 to move along the axial direction to adjust the magnitude of the air flow in the upper semi-circular outer air passage or to close it; the second hydraulic cylinder 18 drives the second inner cylinder 5 to move along the axial direction to adjust the magnitude of the air flow in the lower semi-circular inner air passage or to close it; that is, through the combined action of the two, the concentration and position of the oxygen-enriched gas can be flexibly adjusted in the entire circumferential direction, thereby controlling the combustion state of the flame in the circumferential direction and the temperature distribution, greatly improving the combustion efficiency and also improving the utilization efficiency of the oxygen enrichment and saving energy.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary kiln burner with adjustable oxygen-enriched distribution for hazardous waste treatment, characterized in that: It comprises an inner sleeve assembly and an outer sleeve assembly which are coaxially sleeved, wherein a gas channel is formed between the inner sleeve assembly and the outer sleeve assembly, the outer sleeve assembly comprises a first outer cylinder and a second outer cylinder which are coaxially sleeved, the first outer cylinder is located inside the second outer cylinder, and an outer wind channel is formed between the first outer cylinder and the second outer cylinder; the inner sleeve assembly comprises a first inner cylinder and a second inner cylinder which are coaxially sleeved, the first inner cylinder is located inside the second inner cylinder, and an inner wind channel is formed between the first inner cylinder and the second inner cylinder, a central wind channel and an ignition port are provided in the first inner cylinder, and oxygen-enriched wind or ordinary wind is injected into the outer wind channel and / or the inner wind channel.

2. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 1 is characterized in that: Two first partitions arranged along the axial direction are provided on the outer wall of the first outer cylinder to divide the outer wind channel into an upper semicircular outer wind channel and a lower semicircular outer wind channel isolated from each other, and a first arc-shaped wind resistance block is provided at the inner end of the upper semicircular outer wind channel, and the first arc-shaped wind resistance block is fixed on the outer wall of the first outer cylinder; a second arc-shaped wind resistance block is provided on the inner wall of the second outer cylinder, and when the second outer cylinder moves along the axial direction, the size of the wind flow in the upper semicircular outer wind channel is controlled by the distance between the first arc-shaped wind resistance block and the second arc-shaped wind resistance block.

3. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 2 is characterized in that: The height of the first arc-shaped wind resistance block gradually increases along the wind flow direction in the outer wind duct; the second arc-shaped wind resistance block is fixed at the upper semicircle of the inner wall of the second outer cylinder, and the height of the second arc-shaped wind resistance block gradually decreases along the wind flow direction in the outer wind duct.

4. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 3 is characterized in that: When the first arc-shaped wind resistance block and the second arc-shaped wind resistance block are close to each other, the wind passage formed between them gradually narrows until they are closely attached to each other and seal the upper semicircular outer wind passage.

5. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 1 is characterized in that: Two second partitions arranged along the axial direction are provided on the outer wall of the first inner cylinder to divide the inner wind channel into an upper semicircular inner wind channel and a lower semicircular inner wind channel isolated from each other, and a third arc-shaped wind resistance block is provided at the inner end of the lower semicircular inner wind channel, and the third arc-shaped wind resistance block is fixed on the outer wall of the first inner cylinder; a fourth arc-shaped wind resistance block is provided on the inner wall of the second inner cylinder, and when the second inner cylinder moves along the axial direction, the size of the wind flow in the lower semicircular inner wind channel is controlled by the distance between the third arc-shaped wind resistance block and the fourth arc-shaped wind resistance block.

6. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 5 is characterized in that: The height of the third arc-shaped wind resistance block gradually increases along the wind flow direction in the inner wind duct; the fourth arc-shaped wind resistance block is fixed at the lower semicircle of the inner wall of the second inner cylinder, and the height of the fourth arc-shaped wind resistance block gradually decreases along the wind flow direction in the inner wind duct.

7. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 6 is characterized in that: When the third arc-shaped wind resistance block and the fourth arc-shaped wind resistance block are close to each other, the wind channel formed between the two gradually narrows until they are closely attached to each other and seal the wind channel in the lower semicircle.

8. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to any one of claims 2 to 7, characterized in that: A first power mechanism is also provided for driving the second outer cylinder to move along the axial direction.

9. The oxygen-enriched distribution adjustable rotary kiln burner for hazardous waste treatment according to claim 8, characterized in that: A second power mechanism is also provided for driving the second inner cylinder to move along the axial direction.

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