The Babcock & Wilcox Company

James F Desellem

Karl M Heil

Thomas J Flynn

Mikhail Maryamchik

Albert D LaRue

Mandar R Gadgil

Eric Lynn Wells

Larry A Hiner

William R Stirgwolt

Laura M McDermitt

John A Kulig

Steven L Osborne

Jeremiah J Yoder

Margaret Yeager

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

Material handling systems for fluids are disclosed herein. The fluid may be a liquid, solution, slurry, or emulsion. The systems receive as inputs the fluid, steam, and water. These feed into a surge tank where additives can be introduced. The steam and water are used to control some physical properties and enable the distribution of the fluid as desired. In particular embodiments, the system is useful for handling materials to be sent to a dual-phase fuel feeder for combustion in a fluidized-bed boiler, the energy being used to generate electricity or in various production processes.

Material handling system for fluids

Energy is generated from cellulosic biofuel waste streams, specifically a lignin filter cake and a waste syrup, by combusting these waste products in a fluidized bed combustor under specified conditions. The heat and steam generated can be used to generate electricity and/or in cellulosic biofuel production processes.

Methods of generating energy from cellulosic biofuel waste

A dual phase fuel feeder is disclosed that can be used to provide both solid fuels and liquid fuels to a boiler, such as a fluidized bed boiler. The fuel feeder includes a sloped chute which defines a solid feedpath. Gas distribution nozzles are located at the base of the fuel feeder, and secondary nozzles are located so as to be able to distribute a liquid or particulate fuel into the solid feedpath. This permits the liquid fuel to contact the solid fuel and be carried into the fluidized bed instead of becoming suspended above the bed.

Dual phase fuel feeder for boilers

A flue gas passage arrangement for a steam generator which permits adjustment of the heat transfer effectiveness of a final bank of heat exchanger surface to control a temperature of the flue gas flowing through and exiting from the flue gas passage and conveyed to a downstream NO reduction device having a minimum operating temperature. The NO reduction device is advantageously an SCR. Economizer heating surface is located within the flue gas passage, and a baffle plate extends through the flue gas passage and creates two flue gas paths there through. The economizer heating surface may be a single, common bank having a section located in both gas paths, or in only one gas path. Alternatively, two separate banks of economizer heating surface may be employed. A variable position damper is provided in one gas path, either below or above one section. The variable position damper can be selectively opened or closed to permit or restrict the flow of flue gases through the second section to control the effectiveness of the economizer heating surface to maintain the temperature of the flue gas conveyed to the downstream NO reduction device at or above the minimum operating temperature.

Boiler internal flue gas by-pass damper for flue gas temperature control

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Salineville, OH, United States of America

James F Desellem