B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/348
B01D 53/34 (2006.01) B01D 53/50 (2006.01) C01B 17/60 (2006.01)
Patent
CA 1073187
ABSTRACT In the removal of sulphur dioxide, from a flue gas stream it is known to use a solid acceptor which is regenerated using reducing or strip- ping gas. However, the time required for regenerating the acceptor is less than that required for loading the acceptor. As a result there is a discon- tinuous demand for reducing or stripping gas which consequentially places a high demand upon the unit generating the reducingly stripping gas and the unit for treating this gas subsequent to regeneration of the acceptor. The present invention overcomes the drawbacks associated with a discontinuous demand for reducing or stripping gas by providing a process for the removal of sulphur dioxide from a flue gas stream by means of a solid acceptor on which the sulphur dioxide is accepted and from which it is subsequently recovered by regeneration of the loaded acceptor with a reducing gas, which process is carried out in two or three equally large main reaction zones com- prising the said acceptor, of which zones at least one and at most two is/are invariably connected to the flue gas stream and said main zones being alter- nately subjected to a regeneration treatment with the exclusion of the flue gas stream, characterized in that an auxiliary reaction zone with acceptor is applied, which auxiliary reaction zone is of shorter length than the said main reaction zones, and which auxiliary zone is subjected to a regeneration treatment during the short intervals which are maintained between the subse- quent regeneration treatments of the main reaction zones.
220642
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