|
|
|
Return to Japanese Patent Table of Contents High temperature desulfurization of synthesis gas. Abstract Synthesis gas, fuel gas, or reducing gas is produced by the noncatalytic partial oxidation of a sulfur-containing liquid hydrocarbonaceous fuel or a slurry of sulfur-containing solid carbonaceous fuel with a free-oxygen containing gas in the free-flow reaction zone, or first reaction zone R1, of a refractory lined gas generator at an autogenous temperature in the range of about 1900oF to 2900oF and above the ash fusion temperature of the slag formed in the reaction zone, so that a high proportion of the carbon in the fuel feed to the reaction zone is converted into carbon oxides. At least a portion of the hot effluent gas stream from the reaction zone is passed through a free-flow radiant cooler, or second reaction zone R2, in admixture with an iron-containing additive or in admixture with a second portion of the fuel and an iron-containing or calcium-containing additive. In the radiant cooler or second reaction zone R2, at least a portion of the sulfur-containing gases, e.g. H2S and COS react with the iron-containing or calcium-containing additive to produce particulate matter comprising iron oxysulfide or calcium sulfide. Further, a portion of this newly formed particulate matter and/or the iron-containing or calcium-containing additive combine with molten slag and/or ash in the hot raw gas stream passing through the radiant gas cooler or the second reaction zone R2. The slag produced thereby has a reduced ash fusion temperature and a reduced viscosity, or the fly-ash which is produced thereby has an increased ash softening temperature. The product gas stream discharged contains a reduced amount of sulfur-containing gases |