Babcock Power Environmental Inc.

Babcock Power Development LLC

James D Dougherty

James Kyle Neathery

Angelos Kokkinos

Matthew Quitadamo

John R Harold

Circulating dry scrubbing (CDS) systems and methods utilizes a particle classification unit operation to separate unreacted sorbent (such as lime, limestone, or sodium-based sorbent) such that a reactive fraction of the cut stream may be selectively recovered to a flue gas scrubbing system. This reduces the amount of fresh sorbent that must be supplied for pollutant removal.

Reduced sorbent utilization for circulating dry scrubbers

The invention provides a system for regenerative selective catalytic reduction including a catalyst chamber that contains a catalyst for reducing NOin a gas stream passing therethrough. The system also includes a reactant injector, first and second heat exchangers, and a valve manifold adapted to direct a substantially continuous gas stream through the heat exchangers and catalyst chamber in such a manner as to flow through the catalyst chamber in the same flow direction during each cycle of the system. The invention also provides a process of regenerative selective catalytic reduction wherein the gas stream through the catalyst chamber flows in the same flow direction during each cycle of the process.

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Boxford, MA, United States of America

James D Dougherty