Production method of high-concentration sulfur dioxide gas

Abstract

The invention discloses a production method of high-concentration sulfur dioxide gas, which comprises the following steps: cooling sulfur dioxide flue gas generated by combustion of a sulfur burning furnace, enabling part of the flue gas to enter a downstream process, enabling the rest flue gas to enter the sulfur burning furnace after being mixed with air before returning to the sulfur burning furnace through a pipeline, and simultaneously spraying and burning liquid sulfur in the sulfur burning furnace to generate sulfur dioxide flue gas with a proper concentration, and repeating the process. According to the method, the flue gas cooled by a waste heat boiler flows back, so that the concentration of sulfur dioxide in the flue gas can be increased to be higher, overtemperature of the sulfur burning furnace is avoided, and a large amount of heat can be recycled.

Description

technical field [0001] The invention relates to a production method of sulfur dioxide gas, in particular to a production method of high-concentration sulfur dioxide gas. Background technique [0002] Industrial production of sulfur dioxide is mainly obtained from direct incineration of sulfur-containing raw materials. When incinerating sulfur to produce sulfur dioxide, if the concentration of sulfur dioxide in the sulfur dioxide flue gas is to be increased to 18%, the incineration temperature will reach above 1600°C. Due to the limitation of the high temperature resistance of the equipment (operating temperature <1150°C), the sulfur produced by burning sulfur The concentration of sulfur dioxide in the flue gas will not be too high, generally lower than 13%, which cannot meet the demand for higher sulfur dioxide concentration in some occasions. Oxygen-enriched or pure oxygen incineration of sulfur can produce high-concentration sulfur dioxide, but its cost is higher, and ...

AI Technical Summary

Problems solved by technology

When incinerating sulfur to produce sulfur dioxide, if the concentration of sulfur dioxide in the sulfur dioxide flue gas is to be increased to 18%, the incineration temperature will reach above 1600°C. Due to the limitation of the high temperature resistance of the equipment (operating temperature <1150°C), the sulfur produced by burning sulfur The concentration of sulfur dioxide in the flue gas will not be too high, generally lower than 13%, which cannot meet the needs of higher sulfur dioxide concentration in some occasions

Oxygen-enriched or pure oxygen incineration of sulfur can produce high concentrations of sulfur dioxide, but its cost is higher, and the incineration temperature is also higher, which cannot be tolerated by ordinary equipment

Now the oxygen-enriched smelting process can produce sulfur dioxide gas with a concentration of more than 18%, but it is often far away from the place where sulfur dioxide is used, and it is extremely inconvenient to transport and use safely. Even if separation, purification, compression, and liquefaction can be used to transport sulfur dioxide with a high concentration gas, but at a very high cost

In addition, the general high-concentration sulfur dioxide production process is to water-cool the high-temperature sulfur dioxide flue gas produced by sulfur combustion without recovering heat. The equipment can be simpler, but there is a lot of waste heat and a large amount of cooling water is required.

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