Process equipment for preparing gypsum

Abstract

The invention discloses process equipment for preparing gypsum by virtue of an absorption tower used during flue gas desulfurization. The process equipment comprises a limestone slurry forming mechanism, an oxidation air preparation mechanism and a water supply mechanism, wherein sulfur-containing flue gas in a boiler is transferred into the absorption tower through a pipeline; lime slurry in the absorption tower is extracted and transferred to a slurry circulating pipeline by a circulating pump and is jetted down from the top of the absorption tower through nozzles; lime slurry reacts with sulfur-containing flue gas to generate suspended calcium sulfite particles, and the suspended calcium sulfite particles are oxidized in lime slurry at the bottom of the absorption tower to generate primary gypsum particles; the primary gypsum particles are discharged from the absorption tower by a gypsum discharging pump and is transferred to a gypsum slurry buffer tank; gypsum slurry is subjected to primary dehydration by a gypsum rotational flow station to generate secondary gypsum, and the secondary gypsum is subjected to secondary dehydration by a vacuum belt filter to generate finished gypsum. The equipment is relatively good in stability and can be used for preparing reliable gypsum products, and the cost is greatly lowered.

Description

technical field [0001] The invention relates to a process equipment for making gypsum, which belongs to the technical field of environmental protection. Background technique [0002] my country's energy composition is dominated by coal, and its consumption accounts for about 70% of the total primary energy consumption. Although the application of new energy is becoming more and more extensive, the situation dominated by coal will not be possible for a long time in the future. Difficult to change. For example, thermal power plants use coal as the main fuel to generate electricity, and the direct combustion of coal releases a large amount of SO 2 , which will cause air pollution, and with the increase of installed capacity, SO 2 emissions are also increasing, increasing SO 2 The degree of control becomes very urgent and necessary. Now for SO 2 There are three main control methods: desulfurization before combustion, desulfurization during combustion, and desulfurization a...

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to solve the problem of poor stability of the currently used gypsum desulfurization process, and the problem that the remaining gypsum after desulfurization is difficult to handle and utilize, and to provide a method that can make The desulfurization process has good stability, and at the same time, the gypsum production method that can obtain qualified gypsum products

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