The Babcock & Wilcox Company

Bailey Meter Company

Robert R Walker

Thomas D Russell

A system for the operation of once-through boilers which utilizes variable throttle pressure over a very wide load operating range is disclosed. The system utilizes a valving arrangement permitting the turbine valve (22) to be opened to a predetermined open position, typically 70 percent of its full open position, as soon as possible during the system loading process, maintaining the turbine valve (22) in this predetermined open position while the flow of steam from the boiler is being varied by a control valve (40) and the output pressure of the boiler is varying accordingly, and then allowing the turbine valve (22) to open further from the predetermined open position when the system reaches full design pressure so as to vary the flow of steam from the boiler while the output pressure thereof is maintained substantially constant. In this manner, the boiler is operated at a variable output pressure over a very wide load operating range.

Control system for variable pressure once-through boilers

A coordinated control technique and arrangement for a steam power generating system is disclosed in which combined megawatt error and turbine pressure error signal are used to control the turbine control valve and the fuel flow to the boiler.

Coordinated control technique and arrangement for steam power generating

A furnace draft control for a fossil fuel fired steam generator wherein the rates of flow of fuel, air and flue gas are adjusted in parallel in accordance with changes in power demand and the forced and induced drafts are adjusted in opposite directions as required to maintain furnace draft at set point.

Growing community of inventors

Euclid, OH, United States of America

Robert R Walker