HCN and NH3 formation during coal/char gasification in the presence of NO.
Understanding the conversion of coal-N during gasification is an important part of the development of gasification-based power generation technologies to reduce NO(x) emissions from coal utilization. This study investigated the conversion of coal-N in the presence of NO during the gasification of three rank-ordered coals and their chars in steam and low-concentration O(2). Our results show that NO can be incorporated into the char structure during gasification. The inherent char-N and the N incorporated into the char from NO-char reactions behave very similarly during gasification. During the gasification in steam, significant amounts of HCN and NH(3) can be formed from the incorporated N structure in char, especially for the relatively "aged" chars, mainly due to the availability of abundant H radicals on the char surface during the gasification in steam. During the gasification in 2000 ppm O(2), the formation of HCN or NH(3) from the N structures in char, including those incorporated into the char from the NO-char reactions, was not a favored route of reaction mainly due to the lack of H on char surface in the presence of O(2).
Lin
Jian-Ying
JY
Department of Chemical Engineering, Monash University, Victoria 3800, Australia.
Zhang
Shu
S
Zhang
Lian
L
Min
Zhenhua
Z
Tay
Huiling
H
Li
Chun-Zhu
CZ
D000641:Ammonia / Q000138:chemical synthesis*; D002851:Chromatography, High Pressure Liquid; D003031:Coal; D005740:Gases / Q000737:chemistry*; D006856:Hydrogen Cyanide / Q000138:chemical synthesis*; D009569:Nitric Oxide / Q000737:chemistry*
D003031:Coal; D005740:Gases; D006856:Hydrogen Cyanide; D009569:Nitric Oxide; D000641:Ammonia