Alkali slag liquid desulfurizer preparation device and method

Abstract

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. Including the alkali slag conveying pump, the alkali slag conveying pump is connected to the desanding device through the first pipeline, the top of the desandering device is connected to the thickener through the second pipeline, and the upper part of the thickener is connected to the collector through the first overflow pipeline. The main pipeline is connected, the thickener is connected to the chlorine reduction tank through the fifth pipeline; the auxiliary agent tank is connected to the middle layer of the chlorine reduction tank, the washing water pipeline is connected to the lower layer of the chlorine reduction tank, and the bottom of the chlorine reduction tank is connected to the finished buffer tank through the sixth Pipeline connection; the upper layer of the chlorine reduction tank is connected with the general collection pipeline through the second overflow pipeline. The preparation method is: gravity sand settling, thick sedimentation, washing and dechlorination, and sedimentation after thickening. The liquid desulfurizer is discharged from the bottom of the chlorine desulfurization tank and stored in a buffer tank. Compared with the existing technology: the application of high energy consumption equipment such as filter presses and centrifuges is avoided, the mechanical solid-liquid separation of alkali slag waste 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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