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Show experimental and modeling results on H20 2 and H20/CH30H reactions with NO in a 300 kW combustor firing natural gas and coal. Hydrogen peroxide and its mixtures with methanol can effectively oxidize NO under flue gas conditions. The efficiency of methanol in NO oxidation is about the same or higher as that of H20 2• However, H20/CH30H mixtures are more efficient in NO oxidation than each component individually due to more easy fonnation of OH radicals from H20 2• The presence of H20 2 in mixtures with CH30H is capable of decreasing the amount of CO fonned from CH30H. Since methanol is less expensive than hydrogen peroxide, one can add as much CH30H as possible within CO limits, and then add enough H20 2 to obtain target NO conversion. Experimental results are qualitatively explained by kinetic modeling. EXPERIMENT AL Tests were perlonned at a 1 MBtu/hr Boiler Simulator Facility (BSF) firing natural gas and illinois coal. The facility was previously used for development of CombiNOx by Pont et al. (1993). The BSF, Figure 1, consists of a vertical radiant furnace and a horizontal convective pass. The radiant furnace is a refractory cylinder with a 56 cm inside diameter and 6.7 m height. It is equipped with nUIrerous ports to allow introduction of sampling and injection probes. The convective pass is refractory lined and square in geometry, having inside dimensions of 20x20 cm and 14.2 m long. It is configured with movable air cooled tubes for heat extraction, simulating the economizer and superheater sections of a full scale boiler. The BSF is equipped with a variable swirl distributed mixing burner, a baghouse at the end of the convective pass for particulate control, a continuous emissions monitoring (CEM) system, and personal computer based data acquisition system. The CEM system includes a chemiluminescent NO/NOx analyzer, infrared CO and CO2 analyzers, a fluorescence S02 analyzer, a flame ionization total hydrocarbon analyzer, and a paramagnetic O2 3 - |