Preparation device and method for alkali residue liquid desulfurizing agent

Abstract

The invention relates to a preparation device and method for a desulfurizing agent, in particular to a preparation device and method for an alkali residue liquid desulfurizing agent. The preparation device comprises an alkali residue conveying pump, wherein the alkali residue conveying pump is connected with a sand removal device through a first pipeline; the top end of the sand removal device is connected with a thickener through a second pipeline; the upper part of the thickener is connected with a main collection pipeline through a first overflow pipeline; the thickener is connected with a chlorine reducing bucket through a fifth pipeline; an assistant preparation tank is connected with a middle layer of the chlorine reducing bucket; a washing water pipeline is connected with a lower layer of the chlorine reducing bucket; the bottom of the chlorine reducing bucket is connected with a finished product buffer bucket through a sixth pipeline; an upper layer of the chlorine reducing bucket is connected with the main collection pipeline through a second overflow pipeline. The preparation method comprises the following steps: performing gravitational sand settling, thickening and settling and chlorine reduction by washing, performing settling and thickening, discharging the liquid desulfurizing agent from the bottom of the chlorine reducing bucket, and enabling the liquid desulfurizing agent to enter the buffer bucket for storage. Compared with the prior art, the application of high-energy equipment such as a pressure filter, a centrifuge and the like is avoided, mechanical solid-liquid separation of waste alkali residue liquid is avoided, and the flue gas desulfurization effect is effectively improved.

Description

technical field [0001] The invention relates to a device and method for preparing a desulfurizing agent, in particular to a device and a method for preparing an alkali slag liquid desulfurizing agent. Background technique [0002] Utilizing the by-product alkali slag waste liquid in the ammonia-soda method soda ash production to produce alkali slag liquid desulfurizer, which is used in the production of boiler flue gas desulfurizer, is a new technology for resource utilization of alkali slag waste. At present, there are two production processes of alkali slag desulfurizer: the first process is that the waste liquid of alkali slag is desanded, then enters the filter press for solid-liquid separation, and then adds water to the coulter crusher to reduce chlorine to make a liquid desulfurizer ; The second process is that the alkali slag waste liquid enters the two-stage decanter centrifuge to realize solid-liquid separation and chlorine reduction after desanding, and then it is...

AI Technical Summary

Problems solved by technology

Both of these two processes require a mechanical solid-liquid separation process to achieve solid-liquid separation and chlorine reduction, resulting in the agglomeration of solid particles of the desulfurizer. Low activity, large circulating volume of desulfurization liquid, high operating cost

At the same time, the energy consumption of mechanical solid-liquid separation and chlorine reduction process is high. The plate and frame filter press needs to be equipped with a double-stage pressurized pump and an air compressor station. The damage rate of the filter cloth is high, resulting in high production costs. Pulp caused difficulties. As the first generation technology, the process of preparing liquid desulfurizer by plate-and-frame filter press and coulter crusher has been discontinued since 2012; Agglomeration is reduced, and the quality and activity of the desulfurizer is relatively improved. Therefore, compared with the first-generation process technology, the desulfurization efficiency of the desulfurization tower and the quality of desulfurization gypsum products are improved, but the energy consumption of the centrifuge is still high.

Both of the above two processes require loading, unloading and transportation of solid materials, the degree of automation control is low, and the stability of the entire production process is poor

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