method for low-temperature combustion of sulfur for the production of oleum and sulfuric acid

摘要

The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SOSUB3 /SUBand/or sulphuric acid of a concentration of 94 to 100% by weight of HSUB2/SUBSOSUB4 /SUBby combustion of sulphur with atmospheric oxygen according to the principle of superstoichiometric combustion, cooling the resultant sulphur-dioxide-containing gases to 350° C. to 500° C., catalytic conversion of these cooled gases to give sulphur-trioxide-containing gases in the presence of a vanadium-containing catalyst using single or double contact catalysis, absorption of the sulphur-trioxide-containing gases after cooling, if appropriate removal of liquids from the gases after absorption and energy recovery, with liquid sulphur being injected into the hot combustion gas stream perpendicular to the main direction of flow in the form of a fan using one or more bimodal fan-type nozzles.