Original scientific paper
Numerical study with ChemKin for hydrogasification mechanism of pulverized coal and Hg speciation transformation inside a hydrogasifier
Linbo Yan
; School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
Boshu He
Lele Ma
Xiaohui Pei
Chaojun Wang
Mingyang Li
Jingge Song
Abstract
Zero-emission coal (ZEC) technology has been actively studied recently. It aims to achieve zero emission of CO2 and other pollutants and the efficiency of this system can reach no less than 70%. Hydro-gasification of pulverized coal is a core process of ZEC. However, the mechanism of gasification and transformation of mercury speciation in the hydro-gasification is has not been understood precisely up until now. This restrains the ZEC’s commercialization. The purpose of this paper is to study the mechanism of hydro-gasification and mercury speciation transformation for coal in the gasifier with high temperature and pressure. Detailed chemical kinetics mechanism (CKM) has been proposed for hydro-gasification for pulverized coal in an entrained flow hydro-gasifier. The effects have been studied for different reaction conditions on hydro-gasification products and evolution of Hg in terms of the chemical reaction kinetics method. The CKM mechanism includes 130 elementary reactions and is solved with commercially available software, ChemKin. The calculation results are validated against the experimental data from literature and meaningful predictions are finally obtained. In addition, the chemical equilibrium calculation (CEC) is also used for predictions. Although the CEC method assumes all the reactions have reached chemical equilibrium, which is not the case in industrial reality, the calculation results are of value as reference.
Keywords
Zero-emission coal (ZEC); Hydro-gasification; Chemical equilibrium Calculation (CEC); Chemical kinetics mechanism (CKM); Mercury (Hg)
Hrčak ID:
107267
URI
Publication date:
4.2.2013.
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