The process flow is as follows: Sulfur recovery is usually realized by a process called Claus. Sulfur-containing feed gas is usually called acid gas. First, acid gas is burned with air or oxygen in a device called a combustion furnace. Strictly control the amount of air or oxygen so that the volume ratio of hydrogen sulfide to sulfur dioxide gas in combustion products is 2: 1. Thereafter, the combustion gas is cooled, and the sulfur in the gas is condensed and recovered. After heating, the remaining gas enters the Claus reactor for reaction. The reaction is mainly hydrogen sulfide and sulfur dioxide to produce sulfur and water. This reaction can only be achieved by using a catalyst. The gas after the reaction also needs to be cooled to recover sulfur. Then the residual gas is subjected to secondary and tertiary reactions, and finally the harmless treatment is completed. -Baidu Encyclopedia