Open AccessControl of the emission of NOx during coal combustion by inhibiting the formation of NOx precursor in the pyrolysis process
Author(s) -
Kaixia Zhang,
Sheng Ju,
Song Yang,
Sicong Guo,
Wei Du,
Shoujun Liu,
Lili Chen,
Pengzheng Shi
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/592/1/012051
Subject(s) - char , pyrolysis , coal , nox , combustion , chemistry , coal combustion products , nitrogen , chemical engineering , catalysis , waste management , environmental chemistry , destructive distillation , organic chemistry , carbonization , engineering , adsorption
NO X emitted from coal combustion cause serious pollution to the ecological environment. At present, controlling and reducing NO X emissions has become one of the most important technologies to control the pollutants in the atmosphere. Due to the formation of a large amount of NO X precursor HCN, NH 3 , char-N during coal pyrolysis, and these nitrogen species with O 2 in the air cause the emissions of NOx during combustion. Therefore, it is of great significance to study the control of NO X precursors during coal pyrolysis. The addition of additives to coal has an important catalytic effect on the control of NO X precursors during coal pyrolysis. In this paper, the catalytic effect of additive Fe, Ca, Na on nitrogen transport during pyrolysis of raw coal or demineralized coal was discussed. It can be concluded that Fe, Ca, Na can catalyze the conversion of NH 3 , HCN and char-N to N 2 , thus reducing the NO X precursor in the pyrolysis of coal and reducing the emission of NO X in the subsequent combustion process. The result provides an important scientific basis for the control of NO X emission by reducing NO X precursor formed in pyrolysis during coal combustion.