Anti-scabing method of aluminum oxide roasting furnace flue gas waste heat recovery process

Abstract

An anti-scabing method of an aluminum oxide roasting furnace flue gas waste heat recovery process relates to an improvement of the aluminum oxide roasting furnace flue gas waste heat recovery process method directly using water to contact flue gas. The method is characterized in that the water system of a gas-liquid exchange tower adopts an independent self-circulation mode in the recovery process, and the produced hot water passes through an indirect heat exchange device to exchange heat with the water required by production users so as to realize the aim of separating the water for the direct heat exchange system and the water for the users. The anti-scabing method of the invention adopts the technology of directly exchanging heat and recycling exhaust heat from the aluminum oxide roasting furnace flue gas, thus greatly decreasing the scabing speed of the system, increasing the running rate of the recovery system and then ensuring the normal operation of the recovery process.

Description

technical field [0001] The invention relates to an anti-scarring method for recovering waste heat from flue gas of an alumina roasting furnace, and relates to an improvement of a method for recovering waste heat from flue gas of an alumina roasting furnace by directly contacting water and flue gas. Background technique [0002] At present, in order to save energy and reduce consumption, alumina production enterprises are constantly developing new energy-saving methods. The waste heat of alumina roasting furnace flue gas adopts the method of direct heat exchange between water and flue gas for waste heat recovery, which is a technology that some enterprises have just developed in recent years. However, due to the direct contact between water and flue gas during use, the user's water directly enters the heat exchange system. When the water quality is hard or the alkalinity is high, especially when the water alkalinity is greater than 20g / l (full alkali), the system will be scarr...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to save energy and reduce consumption, alumina production enterprises are constantly developing new energy-saving methods. The waste heat of alumina roasting furnace flue gas adopts the method of direct heat exchange between water and flue gas for waste heat recovery, which is a technology that some enterprises have just developed in recent years. However, due to the direct contact between water and flue gas during use, the user's water directly enters the heat exchange system. When the water quality is hard or the alkalinity is high, especially when the water alkalinity is greater than 20g / l (full alkali), the system will be scarred. If the speed is fast, the equipment and pipelines will be unusable due to scarring and blockage, and need to be cleaned, which will affect the normal operation cycle of the recovery system

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