The Babcock & Wilcox Company

Laura M McDermitt

Mandar R Gadgil

Tony F Habib

Thomas J Flynn

James F Desellem

John Ronald Cline

Prasanna Seshadri

Margaret Yeager

Various embodiments of a system for the removal of particulate emissions from an electric generating unit are provided, comprising: a gas producer; a primary particulate collector unit including: a primary collection hopper field each including at least one primary collection hopper, wherein each primary collection hopper includes a primary collection hopper outlet, each primary collection hopper outlet fluidically connected to a particulate discharge duct; a flue duct inlet oriented upstream of the at least one primary collection hopper field; a flue duct outlet oriented downstream of the primary collection hopper field; wherein the gas producer is fluidically connected to the primary particulate collector unit by a flue duct; and a particulate recirculation duct fluidically connected at a first end to the primary collection hopper and/or the particulate discharge duct, and fluidically connected at a second end to the flue duct upstream of the primary particulate collector unit.

Sorbent utilization improvement by selective ash recirculation from a particulate collector

The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus directed to one or more of: (i) reducing the levels of NOfrom one or more types of combustors, furnaces or boilers; (ii) reducing the levels of NOfrom one or more types of biomass combustors, furnaces or boilers; or (iii) reducing the levels of NOfrom one or more types of fluidized bed biomass combustors, furnaces or boilers. In one embodiment, the method and apparatus of the present invention permit the use of a less complex and/or expensive system to accomplish selective non-catalytic reduction (SNCR) and enable one to achieve DeNO(NOreduction) under low load or unit turndown operation for biomass combustion in a bubbling fluidized bed (BFB) boiler.

Selective non-catalytic reduction (SNCR) of NOx in fluidized bed combustion reactors

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Wadsworth, OH, United States of America

Laura M McDermitt