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Show 2 Introduction Low NOx combustion science has progressed significantly in the last several years. Many new low NOx burners meet NOx compliance standards. The retrofit costs for low NOx burners reportedly range from $12- SIS/kW, but these costs are viewed as unacceptably high by many companies with power boilers. This is especially true of utilities facing capital cost spending restraints due to rate pressures from independent producers. As an engineering combustion systems company serving the utility, industrial and marine sectors, RJM Corporation has worked with many clients to expand the envelope of combustion system performance. Increasing low NOx performance represents the goal of the industry today. However, in recent years, an industry mandate has developed to make conventional burner systems meet NOx compliance standards by simple, but economic, changes to existing burner components. One part of this mandate requires installed costs to be less than $4/kW for coal units and $3/kW for gas and oil units. Also, only simple mechanical changes are desired. NOx control techniques to be avoided include burners out of service, burner biasing by elevation, external flue-gas recirculation, or overfire air injection. Acceptable techniques included balancing the airflow and fuel flow as a low NOx control prerequisite. As shown in Figure 1, RIM Corporation has been successful in meeting these program objectives for conventional, front wall fired coal and oil burner units, and standard tangentially-fued oil burning systems . . 7 .6 ecn .5 .2"5' eenn'a" l·4 e E w E .3 O)C-Z .2 .1 O~~~--~~~--~L-~ __ ~ ____ ~ __ Coal Oil (T·fired) 011 (Standard) DEMONSTRATED CONVENTIONAL BURNER NOx CONTROL Figure 1 |
