High-efficiency oxygen combustion device for treating aluminum ash residue

Abstract

The utility model discloses a kind of oxygen combustion-supporting combustion devices of high efficiency processing aluminium ash, belong to aluminium ash processing technical field, including rotary kiln, support, gas conveying mechanism and recovery mechanism, gas conveying mechanism includes liquid oxygen bottle, oxygen inlet pipe, gasifier, connecting pipe, valve one and oxygen lance, gas conveying mechanism is used to be generated by liquid oxygen gasification Pure oxygen is sprayed into rotary kiln by oxygen lance combustion-supporting, recovery mechanism includes air inlet pipe, oxygen removal box, air outlet pipe and circulation pipe, air inlet pipe is connected rotary kiln top, screen is equipped in air inlet pipe, copper-based catalyst is fixedly connected in oxygen removal box, molecular sieve cylinder is fixedly connected in air outlet pipe, circulation pipe is connected air outlet pipe top and air inlet pipe. The utility model replaces air by gas conveying mechanism delivery pure oxygen, solve the problem of prior art waste gas waste heat, low thermal efficiency, and by recovery mechanism to waste gas is purified gradually, solve the problem of waste gas emission pollution and resource waste, and recycle pure nitrogen.

Description

Technical Field

[0001] This utility model relates to the field of aluminum ash slag treatment technology, and in particular to an oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag. Background Technology

[0002] Aluminum ash slag is a major byproduct of the electrolytic aluminum and aluminum processing industries. It contains a certain amount of metallic aluminum as well as aluminum nitride and aluminum carbide compounds, and has recycling value. One of the common methods for treating aluminum ash slag is to use a rotary kiln for high-temperature roasting to recover metallic aluminum and to treat other components in a harmless manner.

[0003] During the high-temperature roasting process in a rotary kiln, a continuous supply of heat is required to maintain the high-temperature environment necessary for the reaction. In traditional processes, air is typically used as the combustion-supporting gas to support the combustion of fuel. Air contains nearly 80% nitrogen. This large amount of inert gas does not participate in the combustion reaction during the combustion process, but it is heated to the high temperature state inside the kiln. This not only wastes a lot of heat energy, resulting in low combustion efficiency and heat utilization, but also significantly increases the total emissions of exhaust gas.

[0004] These high-temperature exhaust gases contain nitrogen that has been ineffectively heated, as well as nitrogen and carbon dioxide generated from the reaction of aluminum nitride, aluminum carbide, and other substances in aluminum ash slag. In existing technologies, these mixed exhaust gases are often directly emitted without effective treatment, which not only wastes a lot of thermal energy but also pollutes the environment. At the same time, the useful components in the exhaust gases are not recovered and utilized, resulting in resource waste.

[0005] Therefore, this utility model proposes an oxygen-assisted combustion device for efficiently treating aluminum ash slag to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems of low thermal efficiency, large amount of waste gas, resource waste and environmental pollution caused by the use of air-assisted combustion in the existing aluminum ash slag treatment devices, this utility model aims to provide a high-efficiency oxygen-assisted combustion device for treating aluminum ash slag with improved structure that can effectively solve the above problems.

[0007] This utility model provides an oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag, comprising: a rotary kiln and a support; and an air conveying mechanism and a gas recovery mechanism disposed on one side of the rotary kiln.

[0008] The gas delivery mechanism consists of a liquid oxygen cylinder, an oxygen inlet pipe, a vaporizer, a connecting pipe, a valve, and an oxygen lance connected in sequence. The liquid oxygen cylinder is located at the rear of the rotary kiln, and the oxygen lance at the end of the gas delivery mechanism is connected to the interior of the rotary kiln to deliver pure oxygen after the liquid oxygen is vaporized to the rotary kiln for combustion support.

[0009] Furthermore, the recovery mechanism is composed of an air inlet pipe, a screen, a deoxygenation box, a copper-based catalyst, an air outlet pipe, a molecular sieve cylinder, and a circulation pipe connected in sequence. The air inlet pipe is connected to the top left side of the rotary kiln, and the end of the circulation pipe is connected back to the air inlet pipe. Through the connection and combination of the recovery mechanism and the rotary kiln, it is used to purify and recover the waste gas generated by the rotary kiln.

[0010] Preferably, in order to effectively filter dust in the exhaust gas, a screen is fixedly connected to the bottom of the inner wall of the air inlet pipe. The screen is horizontally set, which increases the filtration contact area and can effectively intercept solid particles in the exhaust gas, preventing blockage of subsequent pipelines and equipment.

[0011] Preferably, in order to ensure the efficiency and sufficiency of the deoxygenation reaction, a copper-based catalyst is fixedly connected to the inner wall of the deoxygenation box. The copper-based catalyst is evenly distributed inside the deoxygenation box to provide the maximum reaction contact area, thereby efficiently removing oxygen contained in the exhaust gas.

[0012] Preferably, in order to efficiently adsorb carbon dioxide in the exhaust gas, a molecular sieve cylinder is fixedly connected to the inner wall of the exhaust pipe. The molecular sieve cylinder is axially arranged inside the exhaust pipe to guide the gas to flow axially through the molecular sieve material, prolong the contact time between the gas and the molecular sieve, and improve the adsorption effect on carbon dioxide molecules.

[0013] Preferably, in order to facilitate operators to accurately control the supply of pure oxygen, the valve is located on the outer wall of the connecting pipe and has a handle that can be turned. The structure makes it intuitive and convenient to manually open, close or adjust the oxygen passage, thereby improving the reliability of the device operation.

[0014] Preferably, in order to flexibly control the temperature of the deoxygenation reaction, a second valve is provided on the circulation pipe. The second valve is connected to the outer wall of the circulation pipe and is used to precisely control the flow rate of the reflux nitrogen, thereby stably diluting the oxygen concentration in the waste gas entering the recovery mechanism and preventing the reaction from overheating.

[0015] Preferably, in order to form a compact and reasonable gas supply layout, the liquid oxygen cylinder is located at the rear of the rotary kiln, while the gasifier is located on the right side of the liquid oxygen cylinder. This positional relationship shortens the liquid oxygen delivery pipeline and facilitates the smooth entry of liquid oxygen into the gasifier for gasification.

[0016] Preferably, in order to achieve stepwise and efficient purification of waste gas, the recycling mechanism is configured as a series structure. The structure forces the waste gas to pass through the screen for dust removal, through the deoxygenation box for deoxygenation, and through the molecular sieve cylinder for decarbonization in a predetermined order, ensuring that impurities and target gases are removed in an orderly and thorough manner.

[0017] This utility model has the following beneficial effects: 1. This utility model, by setting up a gas conveying mechanism, delivers the pure oxygen generated after the liquid oxygen is oxidized to the rotary kiln to replace air for combustion, which solves the problem in the prior art that the use of air for combustion leads to a large amount of nitrogen entering the reaction, generating more waste gas and waste heat, and low thermal efficiency. It reduces the generation of waste gas and waste heat, and improves combustion efficiency and heat utilization rate.

[0018] 2. This utility model, by setting up a recycling mechanism, sequentially treats the exhaust gas discharged from the rotary kiln by screen dust removal, copper-based catalyst deoxygenation, and molecular sieve cylinder carbon dioxide removal, which solves the problem of resource waste and environmental pollution caused by direct emission of exhaust gas in the prior art. It achieves the technical effect of separating and recovering pure nitrogen, realizing resource recycling, and avoiding environmental pollution.

[0019] 3. This utility model solves the problem of excessively high oxygen concentration in the deoxygenation box causing violent reaction and excessively high temperature with the copper-based catalyst, by setting a circulation pipe and valve two in the recovery mechanism to return part of the purified nitrogen to the inlet pipe. It dilutes the oxygen concentration in the inlet gas, stabilizes and controls the deoxygenation reaction temperature, and ensures the safe and stable operation of the recovery mechanism. Attached Figure Description

[0020] Figure 1 This is a perspective view of an oxygen-assisted combustion device for efficiently treating aluminum ash slag according to the present invention. Figure 2 This is a schematic diagram of the gas supply mechanism of an oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 A partial structural exploded view of the rotary kiln of the oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag proposed in this utility model. Figure 5 This is a structural cross-sectional view of the recovery mechanism of an oxygen-assisted combustion device for efficiently treating aluminum ash slag, as proposed in this utility model.

[0021] Explanation of reference numerals in the attached figures: 1. Rotary kiln; 2. Gas conveying mechanism; 201. Liquid oxygen cylinder; 202. Oxygen inlet pipe; 203. Gasifier; 204. Connecting pipe; 205. Valve 1; 206. Oxygen lance; 3. Recovery mechanism; 301. Gas inlet pipe; 302. Screen; 303. Deoxygenation box; 304. Copper-based catalyst; 305. Gas outlet pipe; 306. Molecular sieve cylinder; 307. Circulation pipe; 308. Valve 2; 4. Support frame. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example: Please refer to Figures 1 to 5 This utility model provides an oxygen-assisted combustion device for efficiently treating aluminum ash slag, which aims to solve the problems of excessive waste gas and heat, low thermal efficiency, and resource waste and environmental pollution caused by the direct emission of waste gas generated in the prior art when using air-assisted combustion to treat aluminum ash slag.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a high-efficiency oxygen-assisted combustion device for treating aluminum ash slag includes a rotary kiln 1 and a support 4. The support 4 is rotatably connected to the left and right sides of the outer wall of the rotary kiln 1. The device also includes a gas conveying mechanism 2 and a recovery mechanism 3. The gas conveying mechanism 2 is located on one side of the rotary kiln 1 and includes a liquid oxygen cylinder 201, an oxygen inlet pipe 202, a gasifier 203, a connecting pipe 204, a valve 205, and an oxygen lance 206. The liquid oxygen cylinder 201 is located on the rear side of the rotary kiln 1. The oxygen inlet pipe 202 is connected to the oxygen inlet pipe 202, which in turn is connected to the vaporizer 203. The vaporizer 203 is located in front of the liquid oxygen cylinder 201. The vaporizer 203 is connected to the connecting pipe 204 via a pipeline. A valve 205 is installed in the pipeline of the connecting pipe 204. The valve 205 is located on the outer wall of the connecting pipe 204 and has a handle that can be turned counterclockwise. The connecting pipe 204 is connected to the oxygen lance 206 via a pipeline. The front of the oxygen lance 206 is connected to the rotary kiln 1.

[0025] Please refer to Figure 1 and Figure 5 The recycling mechanism 3 includes an inlet pipe 301, a screen 302, a deoxygenation box 303, a copper-based catalyst 304, an outlet pipe 305, a molecular sieve cylinder 306, and a circulation pipe 307. The inlet pipe 301 is connected to the top left side of the rotary kiln 1 and is used to exhaust the waste gas. The bottom of the inner wall of the inlet pipe 301 is fixedly connected to the screen 302, which is set horizontally to block dust in the waste gas. The intake pipe 301 is connected to the deoxygenation box 303 through a pipeline. A copper-based catalyst 304 is fixedly connected to the inner wall of the deoxygenation box 303. The copper-based catalyst 304 is evenly distributed inside the deoxygenation box 303 and is used to react with oxygen in the exhaust gas. The deaerator box 303 is connected to the outlet pipe 305 through a pipeline. A molecular sieve cylinder 306 is fixedly connected to the inner wall of the outlet pipe 305. The molecular sieve cylinder 306 is axially arranged inside the outlet pipe 305 and is used to adsorb carbon dioxide in the waste gas. The top of the exhaust pipe 305 is connected to the circulation pipe 307 via a pipeline. The circulation pipe 307 is connected to the return intake pipe 301 via a pipeline. The circulation pipe 307 is equipped with a second valve 308, which is connected to the outer wall of the circulation pipe 307 to control the flow of nitrogen in the circulation pipe 307. The recovery mechanism 3 is configured as a series structure, and the exhaust gas flows through the screen 302, the deoxygenation box 303 and the molecular sieve cylinder 306 in sequence. This structure ensures that the exhaust gas is purified step by step. For the burner built into the rotary kiln 1, those skilled in the art can use conventional gas or oil burners. Its specific internal structure is well-known in the art and will not be described in detail here.

[0026] As a preferred embodiment, please refer to Figure 5 In order to effectively filter dust in the exhaust gas, a screen 302 is fixedly connected to the bottom of the inner wall of the air inlet pipe 301, and the screen 302 is set horizontally.

[0027] As another preferred embodiment, please refer to Figure 5 In order to fully remove oxygen from the exhaust gas, a copper-based catalyst 304 is fixedly connected to the inner wall of the deoxygenation box 303, and the copper-based catalyst 304 is evenly distributed inside the deoxygenation box 303.

[0028] As another preferred embodiment, please refer to Figure 5 In order to efficiently adsorb carbon dioxide, a molecular sieve cylinder 306 is fixedly connected to the inner wall of the gas outlet pipe 305, and the molecular sieve cylinder 306 is axially arranged inside the gas outlet pipe 305.

[0029] As a preferred embodiment, please refer to Figure 2 and Figure 3 To facilitate manual control of oxygen supply and demand, valve 205 is located on the outer wall of connecting pipe 204 and has a handle that can be turned.

[0030] As a preferred embodiment, please refer to Figure 5 In order to control the amount of nitrogen circulating to adjust the deoxygenation temperature, the circulation pipe 307 is equipped with a second valve 308, which is connected to the outer wall of the circulation pipe 307 and is used to control the flow of nitrogen in the circulation pipe 307.

[0031] As a preferred embodiment, please refer to Figure 2 In order to optimize the layout of the gas pipeline, the liquid oxygen cylinder 201 is located on the rear side of the rotary kiln 1, and the gasifier 203 is located on the right side of the liquid oxygen cylinder 201.

[0032] As a preferred embodiment, please refer to Figure 5 In order to achieve the step-by-step purification and separation of waste gas, the recovery mechanism 3 is set in series. During the flow process, the waste gas passes in sequence through the screen 302 set in the inlet pipe 301, the copper-based catalyst 304 set in the deoxygenation box 303, and the molecular sieve cylinder 306 set in the outlet pipe 305.

[0033] Working principle: The aluminum ash slag to be processed is transported into the rotary kiln 1. The rotary kiln 1 is rotated and supported by the support 4. The gas supply mechanism 2 is started, and the liquid oxygen in the liquid oxygen cylinder 201 is transported to the gasifier 203 through the oxygen inlet pipe 202 connected to its front side. The gasifier 203 vaporizes the liquid oxygen to generate oxygen. After the aluminum ash slag is transported, the handle of the valve 205 on the outer wall of the connecting pipe 204 is turned counterclockwise. The oxygen enters the oxygen gun 206 connected to its left side through the connecting pipe 204 and is sprayed into the rotary kiln 1 connected to its front side. At this time, the burner built into the rotary kiln 1 is started, and the fuel is heated to a high temperature to allow oxygen to react with the aluminum ash slag. The gas supply mechanism 2 directly inputs pure oxygen into the rotary kiln 1, so that all the input gas participates in the combustion reaction with the aluminum ash slag. The aluminum nitride in the aluminum ash slag undergoes an oxidation-reduction reaction with oxygen to produce nitrogen, and the aluminum carbide undergoes an oxidation reaction with oxygen to produce carbon dioxide, which combines with the unreacted oxygen to form waste gas. The waste gas generated by the reaction is discharged through the air inlet pipe 301 connected to the top left of the rotary kiln 1. The screen 302 fixedly connected to the bottom of the inner wall of the air inlet pipe 301 will block the dust in the waste gas and prevent blockage. Then the waste gas enters the deoxygenation box 303 connected to the left side of the air inlet pipe 301. The copper-based catalyst 304 fixedly connected to its inner wall reacts with oxygen to generate copper oxide, removing the oxygen in the waste gas. Then the remaining waste gas enters the air outlet pipe 305 connected to the left side of the deoxygenation box 303. The molecular sieve cylinder 306 fixedly connected to its inner wall will remove the carbon dioxide in the waste gas by molecular adsorption. The remaining nitrogen can be stored as an inert gas. Since the reaction between copper-based catalyst 304 and oxygen is an exothermic reaction, if the oxygen concentration is too high, the reaction with copper-based catalyst 304 will be violent and generate a lot of heat. At this time, some nitrogen can enter the inlet pipe 301 through the circulation pipe 307 connected to the top of the outlet pipe 305. By opening the valve 308 set on the outer wall of the circulation pipe 307, the oxygen in the inlet pipe 301 is diluted to avoid the oxygen concentration being too high.

Claims

1. A high-efficiency oxygen-assisted combustion device for treating aluminum ash slag, comprising: Rotary kiln (1); Support (4), which is rotatably connected to the left and right sides of the outer wall of the rotary kiln (1); Its features are, The device also includes a gas conveying mechanism (2) and a recovery mechanism (3), wherein the gas conveying mechanism (2) is disposed on one side of the rotary kiln (1); The gas delivery mechanism (2) includes a liquid oxygen cylinder (201), an oxygen inlet pipe (202), a vaporizer (203), a connecting pipe (204), a valve (205), and an oxygen lance (206). The liquid oxygen cylinder (201) is located on the rear side of the rotary kiln (1). The liquid oxygen cylinder (201) is connected to the oxygen inlet pipe (202) through a pipeline. The oxygen inlet pipe (202) is connected to the vaporizer (203) through a pipeline. The vaporizer (203) is fluidly connected to the connecting pipe (204) through a pipeline. The valve (205) is installed in the pipeline of the connecting pipe (204). The connecting pipe (204) is connected to the oxygen lance (206) through a pipeline. The front side of the oxygen lance (206) is connected to the rotary kiln (1). The recovery mechanism (3) includes an inlet pipe (301), a screen (302), a deoxygenation box (303), a copper-based catalyst (304), an outlet pipe (305), a molecular sieve cylinder (306), and a circulation pipe (307). The inlet pipe (301) is connected to the top left side of the rotary kiln (1). The inlet pipe (301) is connected to the deoxygenation box (303) through a pipe. The deoxygenation box (303) is connected to the outlet pipe (305) through a pipe. The top of the outlet pipe (305) is connected to the circulation pipe (307) through a pipe. The circulation pipe (307) is connected to the inlet pipe (301) through a pipe.

2. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, A screen (302) is fixedly connected to the bottom of the inner wall of the air intake pipe (301), and the screen (302) is set horizontally.

3. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, The inner wall of the deoxygenation box (303) is fixedly connected with a copper-based catalyst (304), and the copper-based catalyst (304) is evenly distributed inside the deoxygenation box (303).

4. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, A molecular sieve cylinder (306) is fixedly connected to the inner wall of the gas outlet pipe (305), and the molecular sieve cylinder (306) is axially arranged inside the gas outlet pipe (305).

5. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, The valve (205) is disposed on the outer wall of the connecting pipe (204) and has a screw-on handle.

6. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, The circulation pipe (307) is equipped with a second valve (308), which is connected to the outer wall of the circulation pipe (307) and is used to control the flow of nitrogen in the circulation pipe (307).

7. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, The liquid oxygen cylinder (201) is located on the rear side of the rotary kiln (1), and the gasifier (203) is located on the right side of the liquid oxygen cylinder (201).

8. The oxygen-assisted combustion device for high-efficiency treatment of aluminum ash slag according to claim 1, characterized in that, The recycling mechanism (3) is configured in series, and includes the screen (302), the deoxygenation box (303), and the molecular sieve cylinder (306) in sequence.

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