Method for preparing sulphurous acid by using sulfur as raw material

Abstract

The invention belongs to the field of chemical engineering, particularly relates to a method for preparing sulphurous acid by using sulfur as a raw material, and also relates to application of a sulphurous acid product produced by the method. The method comprises the following steps that a furnace door of a combustion furnace is opened; solid sulfur is put into combustion discs; then, partial solid sulfur is fed into a dissolving box through a feeding opening formed in the upper part of the combustion furnace; meanwhile, water is added into an acid storage tank; an injection pump, a fan and an air door of the combustion furnace are opened; sulfur dioxide gas generated during sulfur combustion is exhausted through an air outlet, is subjected to temperature reduction and cooling in a position of a smoke pipe connected with the air outlet and is then absorbed by an ejector; absorption tower and tail gas absorption tower process water valves are regulated; an anticorrosion pump is started to spray process water into a tail gas absorption tower. After a sulphurous acid production system provided by the invention is used, the sulfur treatment quantity is effectively increased, and is increased to 250kg / h from the sulfur treatment quantity of 100 to 150kg / h of ordinary equipment, so that the sulfur utilization rate is improved to 99.5 percent from about 70 percent; the SO2 content of tail gas is smaller than or equal to 5mg / Nm<3>.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for preparing sulfurous acid by using sulfur as a raw material. Background technique [0002] During the production and processing of corn starch, corn needs to be soaked, and the raw material used for soaking is food-grade sulfurous acid. At present, it is not easy for corn production enterprises to purchase food-grade sulfur dioxide for the production of sulfurous acid in the market, even if some enterprises outsource it. Edible grade sulfur dioxide, inject sulfur dioxide into production water to prepare sulfurous acid that meets the production requirements and use it in the soaking of corn starch, but the purchased sulfur dioxide does not comply with relevant national regulations because of its uncontrollable or uncontrollable production process, so this method Be eliminated. [0003] Corn production enterprises purchase food-grade sulfur, burn it to prod...

AI Technical Summary

Problems solved by technology

[0002] During the production and processing of corn starch, corn needs to be soaked, and the raw material used for soaking is food-grade sulfurous acid. At present, it is not easy for corn production enterprises to purchase food-grade sulfur dioxide for the production of sulfurous acid in the market, even if some enterprises outsource it. Edible grade sulfur dioxide, inject sulfur dioxide into production water to prepare sulfurous acid that meets the production requirements and use it in the soaking of corn starch, but the purchased sulfur dioxide does not comply with relevant national regulations because of its uncontrollable or uncontrollable production process, so this method Be eliminated

[0003] Corn production enterprises purchase food-grade sulfur, burn it to produce sulfur dioxide, and absorb it with water to prepare sulfurous acid. The defect of this method is that the maximum combustion capacity of the existing sulfur combustion furnace is 100-150kg / h. With the increase of combustion volume, The temperature in the combustion furnace must also increase. If the temperature in the combustion furnace is too high, the sulfur will sublimate and cannot be used effectively.

[0004] Therefore, it is necessary to improve the above-mentioned defects, and to improve the method and system for preparing sulfurous acid from sulfur, so that the quality of sulfurous acid produced by this method can meet the requirements of the products processed by the enterprise, and the designed system can be maximized. The use of raw material sulfur avoids the phenomenon that sulfur sublimation cannot be effectively utilized

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