STAGED COMBUSTION OF SULFUREOUS COMBUSTIBLE EFFLUENTS WITH RECOVERY OF THE SULFUR IN THE CLAUS PROCESS

摘要

The invention relates to a process for advantageously efficiently treating a sulfureous combustible effluent stream by recovering the sulfur in elemental form. This process consists especially of the succession of two steps:
a step of combustion of the sulfureous combustible effluent stream with an oxidant gas in excess,a step of post-combustion of the effluents from the combustion step with an acidic gas.;The stream of the post-combustion effluents, free of chemical compounds that are harmful to the efficacy of the Claus catalysts, is treated in a Claus unit which performs the recovery of the sulfur in elemental form.

主权项

1. Process for treating a sulfureous combustible effluent stream, comprising the successive steps consisting in:
introducing into a combustion chamber the said stream and an oxidant gas in excess, performing the total combustion of the said stream with an excess of the oxidant gas, and withdrawing the gaseous effluent from the combustion chamber; reacting, in a post-combustion chamber, a mixture consisting of the said gaseous effluent and an acidic gas, the said acidic gas being in an amount sufficient for all of the oxidant compounds to be consumed by reaction with the hydrogen sulfide of the acidic gas, the oxidant compounds being O2, SO3 and NOx, and withdrawing the treated stream, the residence time of all of the gaseous streams in the said post-combustion chamber being at least greater than 0.5 second.