Method for preparing sulfur dioxide gas

Abstract

The invention relates to a method for preparing novel sulfur dioxide (SO2) gas. The method comprises the steps of (1) melting sulfur: adding industrial sulfur into a sulfur melting tank disposed on a side wall of a sulfur burner so that the solid sulfur is melted into molten sulfur; (2) gasifying: heating the molten sulfur to obtain sublimed sulfur; (3) burning: leading the sublimed sulfur to the sulfur burner, and mixing and burning the mixture of the sublimed sulfur and air to obtain high temperature SO2 gas; (4) subjecting to a first grade cooling and a second burning: leading the SO2 gas into a first heat exchanger and cooling the SO2 gas with a hot-water circulation cooling process, adding air to perform the second burning after the SO2 gas is cooled to a temperature between 400 DEG C and 450 DEG C, and then cooling the SO2 gas again; and (5) subjecting to a second grade cooling: cooling the SO2 gas after the SO2 gas is led into a injection cycle washing cooler. According to the method, hot water serves as a cooling medium of the first heat exchanger, so that long term corrosion resistance is achieved, the service life of the device is prolonged, generation of sulfur trioxide (SO3) is effectively controlled, device corrosion is effectively prevented and the production cost is saved.

Description

technical field [0001] The invention relates to a novel production method of sulfur dioxide gas. Background technique [0002] SO needs to be used in the sugar making process 2 Gas as an auxiliary material, mainly in the clarification process, SO2 reacts with milk of lime to generate CaSO 3 Precipitation, adsorption, and removal of impurities, colloids, and pigments in the sugar juice to clarify the sugar juice. In addition, SO 2 The gas can also weaken or inhibit the formation of new pigments in the sugar process and reduce the discoloration of white sugar during storage. In addition, in the bleaching process of papermaking, textile, food, etc., it is also necessary to use SO 2 , so high quality SO 2 It plays a very important role in industrial production in many fields. [0003] Existing production SO 2 Gas methods and devices, there are many sulfur combustion instability, resulting in SO 2 poor quality; or incomplete combustion, there is a large amount of sublimate...

AI Technical Summary

Problems solved by technology

[0003] Existing production SO 2 Gas methods and devices, there are many sulfur combustion instability, resulting in SO 2 poor quality; or incomplete combustion, there is a large amount of sublimated sulfur, which will block the pipeline for subsequent processes, deteriorate the operating environment and cause waste of sulfur; or the air volume during combustion is too large, resulting in SO 3 The amount of generation increases, resulting in a large amount of acid mist in the furnace gas, which has a great impact on the quality of the treated substances

Moreover, due to the limited material conditions of the equipment (carbon steel equipment), the equipment is severely corroded, the service life of the equipment is short, and the cost is high, resulting in a passive situation of maintenance once a year and replacement every three years

[0004] The applicant of this patent application applied for "A Production Method of Sulfur Dioxide Gas" in 2011, which solved the problems of incomplete sulfur combustion, SO 3 generation and wet SO 2 The anti-corrosion problem of furnace gas cooling, but this method uses air as the cooling medium and U-shaped heating jacket to melt sulfur, and there are problems such as a little more equipment, some complexity and poor cooling effect

Images