天然气掺混二甲醚扩散式燃烧性能与排放

调节二甲醚(DME)与天然气的体积比,在火焰筒试验台上测试了燃烧器的组分响应,在小型工业炉窑上测试了传热与燃烧性能.结果表明:与纯天然气相比,天然气掺混二甲醚时热效率变化不大,混合气相对于天然气具有较好的互换性;混合气燃烧时污染物的排放,与纯天然气相比也相差不大,NOx等污染物一直维持在较低水平.从经济性角度出发,为提高燃烧效率,建议掺混10%~30%体积分数的二甲醚为宜.

Performance and Emission of Diffusion Combustion Fueled with DME and Natural Gas Mixtures

Performance response tests of diffusion burner on the burner flame tube and heat transfer within industrial furnace were carried out by means of adjusting the proportion of dimethyl ether (DME) in natural gas. Results show that DME mixtures can give similar thermal efficiency in comparison with natural gas, which implies that the mixture has an acceptable interchangeability with natural gas. In addition, pollutant emissions when fueled with DME mixture were found to be consistent with those under natural gas. Particularly NOx remained quite low. It was recommended that DME percentage should be controlled within 10%~30% for the sake of economic feasibility.