OCR Text |
Show SUMMARY AND CONCLUSIONS. A Patent has been granted for the S.E.R. butane nozzle #5,241,949. For each size SER, Eclipse Combustion's new nozzle design was developed to burn butane vapor with market acceptable emission data and performance characteristics. The following results were obtained: • The ceramic 3.25" SER burner operation of Butane is possible at heat fluxes up to 61.6 Kwt/m2. At 45 Kwt/m2 heat flux, which is optimum working regime for that material, the burner can operate with a minimum excess air of 13% - 17%, and maximum 75% - 80%. optimum operation condition to make a minimum NOx emission by 21Dppm is on mixture with approximately 45% excess air. Further increasing of excess air gives only slight NOx reduction but a sharp efficiency decrease. Having the highest efficiency burner operated at 15% excess air creates NOx at approximately 250ppm. In comparison a natural gas burner emits approximately 140ppm NOx. • Metallic 4.5" and 6.0" SER burners burn butane efficiently (~ = 70% at 9250 C furnace temperature) . Maximum and optimum heat fluxes are 28.8 and 22.5 Kwt/m2 respectively. At optimum regime burners can operate within 12% - 85% excess air range, producing NOx emission lower than 200ppm. • SER butane operation reveals a high level of temperature uniformity. For example, a maximum temperature difference of a 3.25" SER is 33 0 C, 4.5" SER - 24 0 C, 6.0" - 27 0 at furnace temperature at approximately 9000 C. Less than 1DOC can be reached at furnace temperature of more than 10000 C. Natural gas data is close to the butane operation. -18- |