Aluminum wheel hub melting gas purification device

Abstract

The utility model belongs to non - ferrous metal regenerative smelting technical field, and disclose a kind of aluminium wheel hub smelting gas purification device, including smoke inlet pipeline, the input end connection smelting flue gas discharge of smoke inlet pipeline, the output end sealing connection of smoke inlet pipeline has heating structure, and the other end of heating structure is connected with denitration device, and the output end of denitration device is connected with waste heat recovery device, and booster fan is equipped between denitration device and waste heat recovery device, and the output end of waste heat recovery device is connected with desulfurization device, and the output end of desulfurization device leads to chimney and is discharged to atmosphere, and heating structure uses hot air heating flue gas of smelting furnace, can prevent temperature too low to cause catalyst damage, the utility model structure design compact and reasonable, can carry out denitration, desulfurization to flue gas, can remove most nitrogen oxides and sulfur dioxide in flue gas, and set heating flue gas, can reduce SCR catalyst consumption, reduce denitration cost, have higher practicality.

Description

TECHNICAL FIELD

[0001] The utility model relates to non ferrous metal regenerative smelting technical field, concretely is a kind of aluminium hub smelting gas purification device. BACKGROUND

[0002] Common aluminium hub is the vehicle hub of aluminium alloy material, can utilize pyrometallurgical smelting to recycle the metal aluminium therein, called regenerative aluminium, and it has considerable proportion in original aluminium production yield.5 tons or more bauxite, 530-550kg anode paste are consumed to produce one ton of electrolytic aluminium, and 1.314 square meters of vegetation are destroyed.The electrolytic aluminium production process needs to consume various production resources, with the increasing shortage of resources, the increasing additional cost of environmental management, the production advantage of regenerative aluminium is increasingly prominent.

[0003] Aluminium recycling in China mainly adopts pyrometallurgical smelting, and the main process that produces waste gas and may cause environmental impact is the smelting process.In the smelting process, the main fuels used are coal, coke, heavy oil, diesel, coal gas and natural gas, etc.After the fuel is burned, the waste gas contains a large amount of smoke and dust and gases containing sulfur, carbon, phosphorus and nitrogen oxides, etc.;after the furnace charge (waste aluminium) is heated, the oil stains in the waste material itself and the combustible inclusions will burn, and a large amount of sulfur, carbon and nitrogen oxides will also be produced;in the smelting process, in order to reduce the burning loss, improve the recovery rate of aluminium and ensure the quality of aluminium alloy, a certain amount of covering agent, refining agent and degassing agent are added, which react with various impurities in the aluminium melt to produce a large amount of waste gas and smoke, which contains various metal oxides and non-metal oxides, and may also contain harmful substances, which may pollute the environment.

[0004] Among them, the highest content in the pollution flue gas is nitrogen oxide and sulfur dioxide, and nitrogen oxide and sulfur dioxide seriously pollute the air, so it is necessary to remove nitrogen oxide and sulfur dioxide from the flue gas. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies of the prior art, the utility model provides an aluminium hub smelting gas purification device to solve the problems of producing a large amount of harmful nitrogen oxide and sulfur dioxide pollution in smelting aluminium hub as proposed in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: an aluminium hub smelting gas purification device, comprising a smoke inlet pipeline, the input end of the smoke inlet pipeline is connected with a smelting flue gas discharge port, the output end of the smoke inlet pipeline is sealingly connected with a heating structure, the other end of the heating structure is connected with a denitration device, the output end of the denitration device is connected with a waste heat recovery device, a booster fan is arranged between the denitration device and the waste heat recovery device, the output end of the waste heat recovery device is connected with a desulfurization device, and the output end of the desulfurization device leads to a chimney and is discharged into the atmosphere.

[0007] Preferably, the heating structure comprises a hot air pipe and a heating cavity, the heating cavity is a large volume cavity, the hot air pipe is arranged through the heating cavity, and the hot air pipe is connected with hot air of the smelting furnace.

[0008] Preferably, the denitration device comprises a high-temperature-resistant pipe and a main structure, the high-temperature-resistant pipe is provided with an ammonia injection grid, one end of the high-temperature-resistant pipe is connected with the heating cavity, the other end of the high-temperature-resistant pipe is connected with the top of the main structure, a rectifying grid is arranged in the main structure and close to an outlet of the high-temperature-resistant pipe, a plurality of catalyst layers are arranged in the main structure, and an exhaust port is arranged at the bottom of the main structure.

[0009] Preferably, the waste heat recovery device comprises a high-pressure gas pipe, a heat exchange tank, a steam mist eliminator and a fluid curved coil pipe, the heat exchange tank is provided with a heat exchange cavity and a single-connection fluid curved coil pipe, the heat exchange tank is provided with a fluid inlet and a fluid outlet, the fluid inlet and the fluid outlet are respectively and sealingly connected with the head and tail of the fluid curved coil pipe, the input end of the high-pressure gas pipe is sealingly connected with a booster fan, the output end of the high-pressure gas pipe is communicated with the heat exchange cavity, the heat exchange cavity is further connected with the steam mist eliminator, and the top end of the steam mist eliminator serves as a device outlet.

[0010] Preferably, the desulfurization device comprises a conveying pipe, a desulfurization tower and an output pipe, the conveying pipe is sealingly connected with the top end of the steam mist eliminator, the conveying pipe is sealingly connected with a spraying layer in the middle of the desulfurization tower, and the output pipe is arranged at the top of the desulfurization tower.

[0011] Compared with the prior art, the aluminum hub smelting gas purification device has the following beneficial effects:

[0012] 1. The aluminum hub smelting gas purification device is provided with a denitration device and a desulfurization device, can perform denitration and desulfurization on flue gas, can remove most of nitrogen oxides and sulfur dioxide in the flue gas, can heat the flue gas, can reduce the loss of an SCR catalyst, can reduce the cost of denitration, and has high practicability.

[0013] 2. The denitration device is provided, denitration is performed by using an SCR method, nitrogen oxides in the flue gas can be removed, the SCR method has high denitration efficiency, low cost and convenient use.

[0014] 3. The heating structure and the waste heat recovery device are provided, the flue gas is heated, denitration operation can be promoted, the catalyst can be prevented from being damaged due to excessively low temperature, catalyst consumption can be greatly reduced and cost can be reduced, the waste heat is recovered after denitration operation, energy utilization rate is improved, and the subsequent desulfurization work is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure schematic view of the utility model;

[0016] Figure 2The utility model discloses a heating structure and denitration device schematic drawing.

[0017] Figure 3 The utility model discloses a denitration device cut structure schematic drawing.

[0018] Figure 4 The utility model discloses a waste heat recovery device structure schematic drawing.

[0019] In the drawing: 1, the smoke pipeline of going in; 2, heating structure; 3, denitration device; 4, booster fan; 5, waste heat recovery device; 6, desulfurization device; 7, hot air pipe; 8, heating cavity; 9, high temperature resistant pipeline; 10, main structure; 11, ammonia injection grid; 12, rectifier grid; 13, catalyst layer; 14, exhaust port; 15, high pressure gas pipe; 16, heat exchange tank; 17, fluid inlet; 18, fluid outlet; 19, steam fog catcher; 20, conveying pipeline; 21, desulfurization tower; 22, output pipeline. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of the utility model protection.

[0021] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0022] A kind of aluminum hub smelting gas purification device, including smoke pipeline 1, the input end of smoke pipeline 1 is connected smelting flue gas discharge port, the output end of smoke pipeline 1 is sealingly connected with heating structure 2, another end of heating structure 2 is connected with denitration device 3, the output end of denitration device 3 is connected with waste heat recovery device 5, booster fan 4 is equipped between denitration device 3 and waste heat recovery device 5, the output end of waste heat recovery device 5 is connected with desulfurization device 6, and the output end of desulfurization device 6 leads to chimney and is discharged into atmosphere.Smelting aluminum hub generated flue gas enters heating structure 2 and is heated and settled from smoke pipeline 1, and then flue gas is transported to heating structure 2 and is denitrated, removes nitrogen oxides therein, after recycling waste heat and cooling, flue gas can be directly discharged after desulfurization by desulfurization device 6, and wherein the discharged flue gas must meet GB 13271 and HJ 462 and other execution standards, fly ash structure can be selectively arranged in front of smoke pipeline 1, aluminum hub belongs to the excellent renewable aluminum waste material, but part of material pollution is heavy, leading to excessive fly ash.

[0023] Further, the heating structure 2 comprises a hot air pipe 7 and a heating cavity 8. The heating cavity 8 is a large cavity, and the hot air pipe 7 is arranged in the heating cavity 8 and connected to the hot air of the smelting furnace. The heating cavity 8 is recommended to be large in volume, so that the pressure is reduced when the volume of the flue gas suddenly increases, and the particulate matters and contaminated dust in the flue gas are deposited and accumulated at the bottom of the heating cavity 8. The hot air pipe 7 can be provided with multiple groups of hot air rotating structures, and the flue gas is heated by the hot air of the smelting furnace. The flue gas is recommended to be heated to about 300°C, and can even be heated to above 350°C.

[0024] Further, the denitration device 3 comprises a high-temperature-resistant pipe 9 and a main structure 10. The high-temperature-resistant pipe 9 is provided with an ammonia injection grid 11, one end of the high-temperature-resistant pipe 9 is connected to the heating cavity 8, and the other end is connected to the top of the main structure 10. The main structure 10 is provided with a rectifying grid 12 near the outlet of the high-temperature-resistant pipe 9. The main structure 10 is also provided with multiple groups of catalyst layers 13. The main structure 10 is provided with an exhaust port 14 at the bottom. The denitration device 3 adopts the SCR denitration method, which is high in efficiency, low in cost, and easy to use. The catalyst is recommended to be a low-temperature SCR catalyst. If the reaction temperature is too low, the activity of the catalyst will be reduced, resulting in a decrease in the denitration efficiency. If the catalyst continuously operates at a low temperature, the catalyst will be permanently damaged. Heating the flue gas can reduce the loss of the catalyst.

[0025] Further, the waste heat recovery device 5 comprises a high-pressure gas pipe 15, a heat exchange tank 16, a steam mist catcher 19, and a fluid curved coil pipe. The heat exchange tank 16 is provided with a heat exchange cavity and a single fluid curved coil pipe. The heat exchange tank 16 is provided with a fluid inlet 17 and a fluid outlet 18. The fluid inlet 17 and the fluid outlet 18 are respectively and sealingly connected to the head and tail of the fluid curved coil pipe. The input end of the high-pressure gas pipe 15 is sealingly connected to the booster fan 4. The output end of the high-pressure gas pipe 15 is in communication with the heat exchange cavity. The heat exchange cavity is also connected to the steam mist catcher 19. The top end of the steam mist catcher 19 serves as a device outlet. The fluid inlet 17 can be connected to cold water, and the fluid outlet 18 can output hot water for use in the daily life of the personnel in the park. The high-temperature flue gas is in contact with the curved coil pipe in the heat exchange tank 16 to be cooled. The steam mist catcher 19 is used to capture the moisture in the flue gas, so as to prevent too much liquid from entering the desulfurization device and affecting the desulfurization efficiency. The waste heat recovery device 5 is recommended to cool the flue gas to below 160°C.

[0026] Further, the desulfurization device 6 comprises a conveying pipe 20, a desulfurization tower 21, and an output pipe 22. The conveying pipe 20 is sealingly connected to the top end of the steam mist catcher 19. The conveying pipe 20 is sealingly connected to the spraying layer in the middle of the desulfurization tower 21. The top of the desulfurization tower 21 is provided with the output pipe 22. The desulfurization device 6 is recommended to adopt a high-efficiency wet sodium method or an ammonia method. The absorbent is circulated and sprayed to absorb the sulfur dioxide in the flue gas. If the smelting production scale is large and the amount of flue gas is large, a pre-washing tower is recommended to be arranged.

[0027] Working principle: when using the device for aluminum hub smelting gas purification, the flue gas generated by smelting is introduced into the smoke pipeline 1, the flue gas is heated to 300 DEG C at the heating structure 2, the high-temperature flue gas is subjected to SCR denitration in the denitration device 3, the flue gas after denitration is pressurized by the booster fan 4 and then transmitted to the waste heat recovery device 5 to recover heat and reduce the temperature to below 160 DEG C, by which the flue gas is introduced into the desulfurization device 6 to be desulfurized, and the flue gas after desulfurization can be directly discharged into the atmosphere after meeting the emission standard.

[0028] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An aluminum wheel hub smelting gas cleaning device comprising a flue (1), the input end of the flue (1) being connected to a smelting gas discharge port, characterized in that: The output end of the smoke inlet pipeline (1) is sealingly connected with a heating structure (2), the other end of the heating structure (2) is connected with a denitration device (3), the output end of the denitration device (3) is connected with a waste heat recovery device (5), a booster fan (4) is arranged between the denitration device (3) and the waste heat recovery device (5), the output end of the waste heat recovery device (5) is connected with a desulfurization device (6), and the output end of the desulfurization device (6) leads to a chimney and is discharged into the atmosphere.

2. The aluminum wheel hub melting gas cleaning apparatus according to claim 1, characterized in that: The heating structure (2) comprises a hot air pipe (7) and a heating cavity (8), the heating cavity (8) is a large-volume cavity, the hot air pipe (7) penetrates through the heating cavity (8), and the hot air pipe (7) is connected with hot air of a smelting furnace.

3. The aluminum wheel hub melting gas cleaning apparatus according to claim 2, wherein: The denitration device (3) comprises a high-temperature-resistant pipeline (9) and a main structure (10), the high-temperature-resistant pipeline (9) is provided with an ammonia injection grid (11), one end of the high-temperature-resistant pipeline (9) is connected with the heating cavity (8), the other end of the high-temperature-resistant pipeline (9) is connected with the top of the main structure (10), the main structure (10) is provided with a rectifying grid (12) near the output port of the high-temperature-resistant pipeline (9), and a plurality of catalyst layers (13) are arranged in the main structure (10).

4. The aluminum wheel hub melting gas clean-up device of claim 1, wherein: The waste heat recovery device (5) comprises a high-pressure gas pipe (15), a heat exchange tank (16), a steam mist eliminator (19) and a fluid curved coil pipe, the heat exchange tank (16) is provided with a heat exchange cavity and a single-coupled fluid curved coil pipe, the heat exchange tank (16) is provided with a fluid inlet (17) and a fluid outlet (18), the fluid inlet (17) and the fluid outlet (18) are sealingly connected with the fluid curved coil pipe in a head-to-tail mode, the input end of the high-pressure gas pipe (15) is sealingly connected with the booster fan (4), the output end of the high-pressure gas pipe (15) is communicated with the heat exchange cavity, the heat exchange cavity is further connected with the steam mist eliminator (19), and the top end of the steam mist eliminator (19) serves as a device output port.

5. The aluminum wheel hub melting gas clean-up device of claim 4, wherein: The desulfurization device (6) comprises a conveying pipeline (20), a desulfurization tower (21) and an output pipeline (22), the conveying pipeline (20) is sealingly connected with the top end of the steam mist eliminator (19), the conveying pipeline (20) is sealingly connected with a spraying layer in the middle of the desulfurization tower (21), and the top of the desulfurization tower (21) is provided with the output pipeline (22).

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