Method and device for improving utilization rate of alkali liquor at alkaline cleaning section of vacuum potassium carbonate desulfurization technique

Abstract

The invention relates to method and device for improving utilization rate of alkali liquor at an alkaline cleaning section of vacuum potassium carbonate desulfurization technique. The method comprises the following steps: diluting NaOH solution by replacing industrial new water with ammonia still waste water in a chemical workshop, and storing the diluted NaOH solution in a NaOH alkali liquor tank; conveying NaOH alkali liquor in the NaOH alkali liquor tank to the NaOH alkaline cleaning section at the upper part of a desulfurizing tower for carrying out alkaline cleaning, enabling the alkaline cleaning water to flow back into a waste alkaline tank, then evenly mixing the alkaline cleaning water in the waste alkaline tank with NaOH alkali liquor in the NaOH alkali liquor tank, conveying back to the alkaline cleaning section at the upper part of the desulfurizing tower for recycling, and stopping recycling until the pH value of waste liquor in the waste alkaline tank is lower than 10; conveying the waste liquor in the waste alkaline tank into an ammonia still tower to be used as alkaline instead of NaOH. According to the method and the device, the alkaline liquor at the alkaline cleaning section can be recycled, and the usage efficiency of the alkali liquor can be improved on the premise of guaranteeing the desulfurization effect of the desulfurizing tower.

Description

[0001] technical field [0002] The invention belongs to the field of chemical production, and in particular relates to a method and a device for improving the utilization rate of alkali liquid in the alkali washing section of the vacuum potassium carbonate desulfurization process. Background technique [0003] Vacuum potassium carbonate desulfurization is a widely used wet desulfurization process developed by Anshan Jiao Nai Institute. Because of its high desulfurization efficiency, in addition to Wuhan Iron and Steel Coking Company, there are coking plants in Angang New District (Bayuquan), Baosteel Meishan Coking Plant, Shaogang Coking Plant, Handan Iron and Steel New District and other coking plants in China. Although the vacuum potassium carbonate desulfurization process of each coking plant The operation conditions are not the same, but they all face problems such as high alkali consumption for gas purification and difficult treatment of desulfurization waste liquid. ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a solution for the low utilization rate of NaOH lye in the alkaline washing section of the vacuum potassium carbonate desulfurization process and a large amount of waste liquid A method and device for improving the utilization rate of alkali solution in the alkali washing section of the vacuum potassium carbonate desulfurization process

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