Babcock Power Environmental Inc.

John R Harold

Clayton Erickson

James D Dougherty

Calvin E Phelps, Sr

Richard F Abrams

Rajaram Jambhekar

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.

Systems and methods for high efficiency regenerative selective catalytic reduction

The invention provides a system for converting urea into reactants useful for removing NOfrom industrial emissions. The system includes a urea inlet, a steam inlet, and a reactor in fluid communication with the urea inlet and the steam inlet. The reactor is configured and adapted to inject urea from the urea inlet into a steam flow from the steam inlet to convert the urea into at least one reactant for NOreduction within a substantially gaseous mixture. The invention also provides a method of converting urea into reactants for reducing NOout of industrial emissions. The method includes injecting urea into a steam flow to convert the urea into at least one reactant for NOreduction within a substantially gaseous mixture.

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Regenerative selective catalytic reduction (RSCR) systems and processes are provided whereby NOand CO levels in gases are reduced by mixing the gas with a reactant and then introducing the gas into an RSCR apparatus for treatment that entails heating the gas, causing the gas to undergo one or more catalytic reactions, and then directing the gas through a heat transfer area, to which the gas provides heat for use in connection with successive cycles of the RSCR process.

Systems and methods for removing materials from flue gas via regenerative selective catalytic reduction

This invention relates generally to the treatment of NOx in combustion flue gas. In certain embodiments, the invention relates to the use of a regenerative heat exchanger (RHE) to convert urea to ammonia in a side stream of flue gas. Ammonia and/or other urea decomposition products exit the heat exchanger, are mixed with the rest of the flue gas, and enter a selective catalytic reduction (SCR) unit for reduction of NOx in the flue gas. The use of an RHE significantly improves the thermal efficiency of the overall process. More particularly, in certain embodiments, the regenerative heat exchanger is a dual chamber RHE.

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Worcester, MA, United States of America

John R Harold