Micronized Coal Reburning No_x Reduction Mechanism Of Study

China is the world's largest coal producing and consuming country. The coal has the absolute predominance in the primary energy, which determines the main position of the coal-electricity power in electricity production. During coal combustion, many kinds of contamination are emitted out, in which nitrogen oxide (NO_x) is one of the important substance leading to increased environment pollution. To control NO_x emission, one of the most valid methods is reburning technology.Research indicated that gas reduction mechanism hace main function on NO_x reduction during coal reburning. Therefore, a simplified model of chemistry dynamics reactions was established by using the method of the Miller sensitivity analysis method on superfine pulverized coal reburning in this paper. The total reaction model was simplified from having 46 radicles and 240 gas radicle reactions to having 37 radicles and 79 gas radicle reactions.In complicated reaction model system, these radicle reaction equations were divided into two categories: trans-hydrocarbon and trans-nitrogen compounds. The reduction essence of hydrocarbon and nitrogen compounds on NO_x was found, and many important chemical radicle reactions were obtained.The volatile and hydrocarbon compound releasing behaviors of superfine pulverized coal were studied by using thermogravimety and gas chromatography under the deoxidized atmosphere. The effects of pyrolysis atmosphere, pyrolysis temperature, coal particle sizes and coal types on coal pyrolysia behaviors were obtained, and the essential reason of NO_x reduction to be enhanced were found.