Alstom Technology Limited

Combustion Engineering, Inc.

General Electric Technology Gmbh

Richard E Donais

Todd D Hellewell

Paul D Kuczma

Robert D Lewis

Wendell H Mills

David P Towle

John Childs Lewis

Galen H Richards

Jonathan S Simon

Kevin T Grzebien

A pulverized solid fuel nozzle tip assembly with a low contact frame for use with a pulverized solid fuel pipe nozzle is described. The pulverized solid fuel nozzle tip assembly has an outer nozzle tip portion adapted to mount in supported relation with the pulverized solid fuel pipe nozzle, and an inner nozzle tip portion adapted for mounting within the outer nozzle tip portion to have secure tiltable movement. The outer nozzle has supporting surfaces that support surfaces of the inner nozzle tip portion to minimize the tilting forces transmitted to the inner nozzle tip portion during normal furnace operation, enhancing the wear resistance of the pulverized solid fuel nozzle tip assembly. The supporting surfaces of the outer nozzle also eliminate stress cracking to the surfaces of the inner nozzle tip portion that can arise due to thermal growth.

Pulverized solid fuel nozzle tip assembly with low contact frame

A fuel nozzle assembly including a conduit defining a fuel inlet and a fuel outlet and being operable to convey a fuel stream comprising a solid particulate fuel entrained in a fluid. The conduit has a flow area defined by an interior surface of the conduit. A first flow deflector and a second flow deflector extend inwardly from the interior surface. The first flow deflector and the second flow deflector are positioned to disrupt a velocity profile of the flow stream established upstream of the conduit.

Flow deflectors for fuel nozzles

A nozzle tip [] for a pulverized solid fuel pipe nozzle [] of a pulverized solid fuel-fired furnace includes: a primary air shroud [] having an inlet [] and an outlet [], wherein the inlet [] receives a fuel flow []; and a flow splitter [] disposed within the primary air shroud [], wherein the flow splitter disperses particles in the fuel flow [] to the outlet [] to provide a fuel flow jet which reduces NOx in the pulverized solid fuel-fired furnace. In alternative embodiments, the flow splitter [] may be wedge shaped and extend partially or entirely across the outlet []. In another alternative embodiment, flow splitter [] may be moved forward toward the inlet [] to create a recessed design.

Low NOx nozzle tip for a pulverized solid fuel furnace

A control system for a fuel-fired furnace and more specifically the control of the stoichiometric ratio of the combustion process occurring within the furnace of a steam generating power plant. The control system, when so employed, is capable of regulating the distribution of air flow to the combustion process such that the formation of oxides of nitrogen are maintained at acceptable levels. The control system includes in general a stoichiometric subsystem that determines the mass flow rate of air required to maintain the stoichiometric ratio within the combustion process; an override protection subsystem which ensures control precedence of the windbox-to-furnace pressure differential over the stoichiometry subsystem; and an overfire air subsystem that acts to apportion air flow amongst the various levels of overfire air within the boiler.

Control of staged combustion, low NO.sub.x firing systems with single or

Growing community of inventors

West Suffield, CT, United States of America

Richard E Donais