Abstract
The gasification tests for the Alagtolgoi and Ailbayan coal deposits were conducted in the temperature up to 850°C using bench scale reactor in order to evaluate product gas composition. Prior to the gasification experiments, the raw coal was pyrolysed in a stainless steel reactor under N2 atmosphere at a temperature of 500°C for 1 h. General behavior of the coal conversion was quite similar for both coals. The gasification tests show that an increase in temperature enhances the formation of hydrogen, carbon dioxide and carbon monoxide. The highest yield of hydrogen and carbon dioxide concentrations of the Ailbayan coal are achieved at temperature of 850°C, which were 2.859 mmol⋅g-1⋅min-1 and 1.054 mmol⋅g-1⋅min-1 respectively. However maximum rate of hydrogen for Alagtolgoi subbituminous coal reached around 800°C. Overall results show that the maximum gasification rate is reached earlier for subbituminous coal than for bituminous coal, but product gas evolution was higher for the investigated bituminous coal.
Highlights
Conversion of coal by any of the processes to produce a mixture of combustible gases is termed coal gasification, even though a large number of chemical reactions other than socalled gasification reactions are involved
The opportunity has been taken to investigate the Alagtolgoi subbituminous and the Ailbayan bituminous coals using a suite of bench scale reactors
The Alagtolgoi and Ailbayan coal samples were screened to a particle size of 0.15 ~ 0.2 mm and air dried before use
Summary
Vol 56 No 04 (220) 2016 and Kazakhstan [5]. The increased utilization of coal is being considered as a means of developing the economy in Mongolia. Taking into account Mongolia’s dependence on imported oil, coal gasification integrated with syngas cleaning process for removal of sulfur component and carbon dioxide can be a reliable clean and efficient energy system. It becomes attractive, if you consider issues, like air pollution problem in Mongolia and possibility to produce cheap gaseous fuel (DME), where gasification enables conversion of coal with very low levels of air pollution compared to most existing coal combustion technologies.
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