Method and device for recycling high-pressure dissolved steam exhaust of diluting tank in alumina production

Abstract

The invention discloses a method and a device for recycling high-pressure dissolved steam exhaust of a diluting tank in alumina production. The steam exhaust produced by a diluting tank (1) and a final condensate water self-evaporator is recycled by adopting a steam exhaust reclaiming device (2), the heat of the steam exhaust is collected by sprayed cold water, and the formed hot water enters a hot water tank (4) from a bottom outlet of the steam exhaust reclaiming device (2) and is delivered to a hot water station through a hot water delivery pump (5) to serve as red mud washing water and hot water for a whole plant. The flow rate of new water is adjusted by the interlocking of an adjusting valve (7) and a thermometer (9) so as to control the temperature of the hot water at the outlet of the steam exhaust reclaiming device (2), and the liquid level balance of the hot water tank (4) is controlled by the interlocking of an adjusting valve (6) and a liquid level meter (10). A water seal (3) is arranged on a steam exhaust pipeline, and a branch pipe is connected to an emergency steam outlet at the top of the steam exhaust reclaiming device (2). The method and the device solve the problem of reclaiming the steam exhaust produced by the diluting tank and the final condensate water self-evaporator, avoid environmental pollution, effectively recycle waste heat, and reduce the production energy consumption.

Description

technical field [0001] The invention relates to a method and a device for recovering and utilizing exhaust gas in a high-pressure dissolution dilution tank in alumina production. Background technique [0002] In the high-pressure dissolution process of an alumina plant, the dissolution slurry is flashed from the evaporator of the final stage pulp and then enters the dilution tank. The slurry is expanded again in the dilution tank and then self-evaporates to produce exhaust gas (100~110°C) , and mixed with exhaust steam (100~110°C) from the evaporator from the final condensed water, and then introduced into the vapor pressure condenser. The upper part of the vapor pressure condenser is sprayed with fresh water from the comprehensive circulating water station of the alumina plant to recover the exhausted steam. Part of the exhausted steam is recovered by spraying cold water and sent to the hot water station as hot water, and part of the hot water is sent back to the hot water ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method and device for recovering and utilizing exhaust steam in a high-pressure dissolution dilution tank in alumina production, so as to overcome the low recovery rate of exhaust steam in the prior art, large waste heat loss of exhaust steam, and a small amount of alkali Exhaust steam exhausted into the atmosphere will cause environmental pollution and other problems

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