论文部分内容阅读
针对燃料分级燃烧技术在我国处于发展阶段,目前国内还没有工业应用的成果和经验这一状况,进行了常规煤粉作为再燃燃料的燃料分级燃烧试验研究,其目的是通过试验了解和掌握燃料分级燃烧技术,并为电厂锅炉应用燃料分级燃烧技术积累经验。华能长兴电厂用常规煤粉(R90=20%)作为再燃燃料进行的燃料分级燃烧试验是以锅炉3层燃烧器下面的2层燃烧器作为主燃区的燃料喷口,通过控制给粉机转速使主燃区的给粉量约80%,最上层燃烧器作为再燃区燃料喷口,再燃区的给粉量约20%,原三次风喷口则作为燃尽风喷口;调整和关闭不同位置的二次风门开度,使锅炉炉膛燃烧形成下面为主燃区(空气过剩系数为1.0)、中间是再燃烧区(空气过剩系数为0.88)和上面为燃尽区(空气过剩系数为1.2)的3个燃烧区段,实现燃料分级燃烧。通过工业试验得到电厂锅炉在现有条件下采用常规煤粉作为再燃燃料可使烟气中NOx排放值降低约20%。
In view of the fact that fuel staged combustion technology is in the stage of development in our country and there is no industrial application result and experience in China at present, the staged combustion test study of conventional pulverized coal as reburning fuel has been carried out. The purpose is to understand and master the fuel classification Combustion technology, and accumulated experience in the application of fuel staged combustion technology for power plant boilers. Huaneng Changxing Power Plant with conventional pulverized coal (R90 = 20%) as a fuel reheat fuel staged combustion test is based on the burner layer 3 burner below the two burner as the main fuel zone fuel nozzle, by controlling the speed to the powder The main combustion zone to about 80% of the amount of powder, the top burner as a fuel zone fuel reburn zone reburn zone to about 20% of the amount of powder, the original tertiary air spout as a burnout wind spout; adjust and close the different positions of the second The degree of opening of the damper caused the combustion in the boiler hearth to form the following main combustion zone (air excess coefficient: 1.0), in the middle, there were 3 reburning zones (air excess coefficient: 0.88) and burnout zone (air excess coefficient: 1.2) Combustion section, to achieve fuel staged combustion. Industrial tests have shown that using conventional pulverized coal as a reburning fuel under current conditions in power plant boilers can reduce NOx emissions by about 20% in flue gas.