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Show ABSTRACT PAPER. NO. 16 Demonstration of Combined NO~ and Sea Emission Control Technologies Involvlng Gas Reburning Dr. Blair A. FOlsom~ Todd M. Sommer v Dr. Roy Payne S V Energy and Environmental Research Corporation 18 Mason Irvine, California 92718 (714) 859-8851 AFRC-JFRC International Conference Environmental Control of Combustion Processes Honolulu, Hawaii October 7-10, 1991 /'" ~l.; CLOt/:' C A-4 TL Three field evaluations of Gas Reburning (GR) integrated with other emission control technologies are in progress. Results from the first tests are presented. GR is a combustion modification emission control technology. It can be easily retrofitted to virtually any combustion system. An appropriate amount of natural gas (typically 10-20 percent of the total heat input) is injected into the furnace above the main burners producing a slightly reducing zone. NOx is reduced by react i on wi th hydrocarbon fragments. Addi tiona 1 overfi re air is provided to burn out the remaining combustibles. GR alone can reduce NOx and S02 emissions by 60 and 20 percent respectively. These control levels may be augmented by integrating GR with other synergistic control technologies. Integration with Sorbent Injection (GR-SI) can increase SO~ emission control to 50 percent. Integration with Low NOx Burners (GR-LNB) can lncrease NOx emission control to 75 percent. Two field evaluation projects involving GR-SI and GR-LNB are in progress at three sites. Initial NO~ test results are available from a 71 MW tangentially fired boiler equipped with ~R-SI. NO~ emissions were reduced by about 70 percent in these short term tests exceeding the goal of 60 percent control. Additional long term tests will confirm these results in normal commercial operation. This work is part of the u.S. Department of Energy Clean Coal Technology \ Program. Cofunding is being provided by the Gas Research Institute, State of Illinois, Public Service Company of Colorado, Colorado Interstate Gas, Electric Power Research Institute, and Energy and Environmental Research Corporation. INTRODUCTION Nitrogen Oxides are generally recognized as air pollutants. Most of the bound nitrogen produced by coal combustion exits the stack in the form of nitric 1 |
