The Babcock & Wilcox Company

Babcock & Wilcox Power Generation Group, Inc.

John William Smith

Donald J Dziubakowski

Oliver W Durrant

A heat exchanger is provided in an air duct between an air heater and a windbox of a combustion means such as a boiler. Dilution air is carried to the heat exchanger from a dilution air fan in a separate duct. The heat in the air from the air heater is transferred to the dilution air via the heat exchanger and the heated dilution air is sent to vaporize ammonia before the ammonia is introduced into an exhaust duct with a selective catalytic reduction (SCR) chamber. A bypass valve is provided around the heat exchanger for blending heated and unheated air to control the temperature of the dilution air.

Carrier air heating system for SCR

A superheater spray water control system for variable pressure applications produces an output signal representative of expected superheater absorption as a function of measured steam flow, compensates the signal for temperature variations within the superheater and adjusts it for over/under fire transients. An output signal representative of required superheater absorption from the drum to the superheater outlet, together with a spray water enthalpy signal obtained as a function of measured stem flow, is used with the compensated and adjusted actual superheater absorption and measured steam flow signals to produce a spray quantity demand signal.

Superheater spray flow control for variable pressure operation

A system for controlling the bed level of a fluidized bed independent of the density of the bed material using a minimum number of pressure sensors is disclosed. A pressure sensor is positioned at the base of the bed, at approximately eight feet above the distributor plate, and at one or more intermediate locations therebetween. The measurements from the foregoing sensors are selectively processed through the use of a specific logic arrangement to produce an output signal representative of the bed level of the fluidized bed.

Control system for a fluidized bed

A bottom supported vapor generator having tubular platens communicating with upper and lower headers and including rigid members fixedly connecting the lower headers to a grid slidably supported on concrete pedestals.

Vapor generator

A coordinated control system for a power producing unit consisting of two, single reheat steam generators supplying steam to a single turbine-generator.

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Massillon, OH, United States of America

John William Smith