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Smoke processing method for alumina roasting furnace

A technology of flue gas treatment and treatment method, applied in waste heat treatment, furnace, furnace components, etc., can solve problems such as adverse environmental impact, and achieve the effects of high heat utilization rate, reduced environmental impact, and large heat exchange

Inactive Publication Date: 2010-11-17
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

[0002] At present, in the alumina production process, the flue gas flow rate of the roaster that roasts aluminum hydroxide into alumina reaches 100,000Nm 3 / h or more, the temperature is about 150°C, and the flue gas contains about 100mg / Nm 3 The left and right alumina or aluminum hydroxide are valuable substances, and direct discharge will have adverse effects on the environment
Flue gases from alumina roasters have not been treated more effectively

Method used

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  • Smoke processing method for alumina roasting furnace
  • Smoke processing method for alumina roasting furnace

Examples

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Effect test

Embodiment 1

[0017] Roasting furnace: exhaust fan speed 75%, feeding capacity 79t / h

[0018] Waste heat recovery system: heat exchanger flue gas throughput 100%, flue gas inlet temperature 153°C, outlet temperature 20.9°C, feed water temperature 20.9°C, outlet water temperature 76°C, flow rate 450m 3 / h, recovery of alumina 13Kg / h.

[0019] Roasting furnace: exhaust fan speed 81%, feeding capacity 82t / h

[0020] Waste heat recovery system: flue gas throughput of heat exchanger is 95%, flue gas inlet temperature is 157°C, outlet temperature is 23°C, feed water temperature is 23°C, outlet water temperature is 77°C, flow rate is 455m 3 / h, recovery of alumina 12.3Kg / h.

[0021] Roasting furnace: exhaust fan speed 89%, feeding capacity 87t / h

[0022] Waste heat recovery system: flue gas throughput of heat exchanger is 85%, flue gas inlet temperature is 150°C, outlet temperature is 25°C, feed water temperature is 25°C, outlet water temperature is 74°C, flow rate is 458m 3 / h, recovery of al...

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Abstract

The invention discloses a smoke processing method for an alumina roasting furnace, relating to a method for utilizing waste heat of smoke discharged into air by an alumina roasting furnace and recovering valuables therein. The method is characterized in that a bypass flue is additionally arranged on a smoke removal pipeline behind the exhaust fan of the roasting furnace, and the bypass flue and the original smoke removal pipeline are respectively provided with a flue valve or a blind damper; and a draught fan is additionally arranged on the bypass flue, the smoke discharged out from the roasting furnace is introduced in a smoke-water heat transfer processor for processing, the generated hot water enters into a settling pond for recovering sediments, and the hot water after sediment separation can be used as washing water of aluminium hydroxide, washing water of red mud or living area heating or bathing water. The method in the invention can recover valuables in the smoke, obviously removes SO2 from smoke, reduces influence of roasting furnace smoke on environment by a wide margin and can realize a win-win effect of economic benefit and social benefit.

Description

technical field [0001] A flue gas treatment method of an alumina roasting furnace relates to a method for utilizing residual heat in the flue gas discharged into the atmosphere from the alumina roasting furnace and recovering its valuable substances. Background technique [0002] At present, in the alumina production process, the flue gas flow rate of the roaster that roasts aluminum hydroxide into alumina reaches 100,000Nm 3 / h or more, the temperature is about 150°C, and the flue gas contains about 100mg / Nm 3 The left and right alumina or aluminum hydroxide are valuable substances, and direct discharge will have adverse effects on the environment. Flue gases from alumina roasters have not been treated more efficiently. Contents of the invention [0003] The object of the present invention is to address the above-mentioned shortcomings and provide a flue gas treatment method for an alumina roaster that effectively utilizes the waste heat in the flue gas discharged into ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCY02P10/25
Inventor 任巨金张广麻树春杨俊丙任绛明吕英哲房连军董海宁薛启峰谢长胜郝向东赵培生景卫兵
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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