More stringent emission limits or the addition of post combustion NO{sub}x control are creating the need for further reduction of NO{sub}x emissions from pulverized coal boilers. Regardless of the current combustion NO{sub}x control method, it is becoming more apparent that stoichiometries local to the burners must be maintained in order to achieve ultra low NO{sub}x performance without significantly sacrificing combustion efficiency or boiler performance and operation. Foster Wheeler's experience shows that proper air and coal metering at the burners is the key component for all future advanced combustion systems. The paper presents an update on the latest findings and benefits associated with operating coal fired boilers using Foster Wheeler and TR-Tech's Electric Charge Transfer technology. ECT systems provide boiler operators with continuous on-line indication of coal flow distribution, conduit velocity and particle fineness. Operators of coal fired boilers equipped with ECT systems are now seeing what "really" occurs within the coal conduits. Highlights from numerous ECT installations on both wall and tangential fired boilers will be presented. This new information being provided by the ECT technology is opening up an entire new spectrum in operational assessment and improvement as well as emission control.
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