TY - JOUR
T1 - Experimental study on characteristics of pressurized grade conversion of coal
AU - Zhou, Guanwen
AU - Zhong, Wenqi
AU - Yu, Aibing
AU - Dou, Yuanyuan
AU - Yin, Junping
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/12/15
Y1 - 2018/12/15
N2 - In order to investigate the characteristics of pressurized grade conversion of coal, an experimental system was established, and the general properties of coal and semi-coke were studied by using the BET and SEM methods. Then, the effects of the following variables on production yields, pollutant gas emission, and the quality of high-grade raw materials such as tar and coal gas were investigated in the ranges as specified: pyrolysis temperature (500–700 °C), pressure (0.1–0.5 MPa), pyrolysis atmosphere (N2 and coal gas) and particle size (0–3 mm and 0–6 mm). It was found that when the coal pyrolysis temperature is 600 °C, the tar yield reaches its maximum, and the coal gas atmosphere and pressure are both helpful to increase the tar and semi-coke yield as well as to improve the quality of tar and the heat value of coal gas. With the pressure increasing, the NO and SO2 emissions decrease. As a result of the pressure increase, the combustion temperature of the semi-coke decreases, resulting in the reduction of high temperature minerals and the increase of low temperature minerals in ash. The results of this study will be useful to address some of the presently existing issues in design, optimization and scale up of pressurized grade conversion of coal processes.
AB - In order to investigate the characteristics of pressurized grade conversion of coal, an experimental system was established, and the general properties of coal and semi-coke were studied by using the BET and SEM methods. Then, the effects of the following variables on production yields, pollutant gas emission, and the quality of high-grade raw materials such as tar and coal gas were investigated in the ranges as specified: pyrolysis temperature (500–700 °C), pressure (0.1–0.5 MPa), pyrolysis atmosphere (N2 and coal gas) and particle size (0–3 mm and 0–6 mm). It was found that when the coal pyrolysis temperature is 600 °C, the tar yield reaches its maximum, and the coal gas atmosphere and pressure are both helpful to increase the tar and semi-coke yield as well as to improve the quality of tar and the heat value of coal gas. With the pressure increasing, the NO and SO2 emissions decrease. As a result of the pressure increase, the combustion temperature of the semi-coke decreases, resulting in the reduction of high temperature minerals and the increase of low temperature minerals in ash. The results of this study will be useful to address some of the presently existing issues in design, optimization and scale up of pressurized grade conversion of coal processes.
KW - Coal
KW - Gas emissions
KW - Pressurized grade conversion
KW - Pyrolysis
KW - Semi-coke
KW - Tar quality
UR - https://www.scopus.com/pages/publications/85050851244
U2 - 10.1016/j.fuel.2018.07.142
DO - 10.1016/j.fuel.2018.07.142
M3 - 文章
AN - SCOPUS:85050851244
SN - 0016-2361
VL - 234
SP - 965
EP - 973
JO - Fuel
JF - Fuel
ER -