Abstract
An incineration process is the most dominant method of the waste disposal in Japan. A stoker furnace is widely used for the waste incineration. Recently, in the stoker furnace, low air ratio and high temperature incineration have been applied increasingly. However, they result in the increase in the amount of air pollutant NOx generated due to flame instability. Especially, it is difficult to control NOx production in char combustion. In this research, in order to evaluate the NOx generation mechanisms in char combustion of waste incineration process, RDF char burning experiments were carried out, investigating the combustion behaviors and exhaust gas compositions. The incineration experiments were conducted at different temperatures and gas conditions such as O2, CO2, steam, EGR(Exhaust gas recirculation). The char-NOx production behavior showed different behaviors depending on experiment conditions. In particular at the steam gas and EGR conditions, the char-NOx concentration was very high due to the steam gas shift reaction.
