Two-way utilization method and device for wet process circulation desulfurization recovered solution

Abstract

The invention discloses a two-way utilization method and device for a wet process circulation desulfurization recovered solution. A foam tank for storing a foam desulfurization recovered solution is connected on a main pipe for conveying the desulfurization recovered solution of a filter press, which is connected with a rich liquid tank, through a pipeline, when the desulfurization recovered solution flowing out of the filter press has foam, a valve on the main pipe, which is used for controlling the desulfurization recovered solution to flow into the rich liquid tank, is closed, the valve on the pipeline connected between the main pipe and the foam tank is opened, and then the foam recovered solution flowing out of the filter press is conveyed into the foam tank through the pipeline; and when the desulfurization recovered solution flowing out of the filter press does not have the foam, the valve on the main pipe is opened, the valve on the pipeline connected between the main pipe and the foam tank is simultaneously closed, then the foam desulfurization recovered solution in the foam tank is conveyed into the filter press through a liquid conveying pump, and after secondary filtration treatment by the filter press, the desulfurization recovered solution after recovery treatment can be conveyed into the rich liquid tank in a circulation desulfurization system. According to the two-way utilization method and device disclosed by the invention, the foam recovery rate is greatly improved, the index of suspended sulfur is reduced, and the yield of a finished product and sulfur is improved.

Description

technical field [0001] The invention relates to the utilization of desulfurization recovery liquid, in particular to a bidirectional utilization method and device for wet cycle desulfurization recovery liquid. Background technique [0002] At present, small-scale nitrogen fertilizer plants that use coal as raw material all use wet ammonia desulfurization or lye circulation desulfurization. The desulfurization tower absorbs the sulfur element after the reaction, and generates foam through the regeneration reaction. When overflowing from the regeneration tank, part of the ammonia water will be entrained. The entrained part of the ammonia water will be filtered through the reinforced polypropylene chamber filter press and returned to the system for reuse to save ammonia water loss. . But when the filter cloth of the filter press is too dirty, the pressure is too high or the regeneration temperature is too low, and the foam is fine, there will be a lot of foam in the return liq...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problem caused by the foam return system caused by the one-way process of the existing return liquid utilization method, and to provide a two-way utilization method and device for the wet cycle desulfurization recovery liquid, which utilizes the two-way process to Reduce the foam returned to the system, increase the foam recovery rate, and solve the problems of excessive suspended sulfur index and increased resistance of the desulfurization tower

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