A tail gas treating unit takes the gas leaving the Claus reactors and recovers the last of its sulphur before the incinerator. Its front end is a combustion chamber, where tail gas is heated or partially combusted to the reaction conditions the licensor specifies, and a waste heat boiler that cools the gas and raises steam. We supply the two together, engineered to the licensor's basis, in the same modular construction as our MCC and incinerator packages.