Abstract
In this paper, we discuss the impact of the rank of coal, petrographic composition, and physico-chemical coal properties on the release and composition of syngas during coal gasification in a CO2 atmosphere. This study used humic coals (parabituminous to anthracite) and lithotypes (bright coal and dull coal). Gasification was performed at temperatures between 600 and 1100 °C. It was found that the gas release depends on the temperature and rank of coal, and the reactivity increases with the increasing rank of coal. It was shown that the coal lithotype does not affect the gas composition or the process. Until 900 °C, the most intense processes were observed for higher rank coals. Above 1000 °C, the most reactive coals had a vitrinite reflectance of 0.5–0.6%. It was confirmed that the gasification of low-rank coal should be performed at temperatures above 1000 °C, and the reactivity of coal depends on the petrographic composition and physico-chemical features. It was shown that inertinite has a negative impact on the H2 content; at 950 °C, the increase in H2 depends on the rank of coal and vitrinite content. The physicochemical properties of coal rely on the content of maceral groups and the rank of coal. An improved understanding these relationships will allow the optimal selection of coal for gasification.
Highlights
In the face of the increasingly restrictive climate and energy policies of the European Union, Poland must look for solutions enabling further use of coal as an energy source
As a result of the conducted experiment involving the gasification of coal at temperatures of up to 1100 ◦ C, we found that the amount of released gas mainly depends on the rank of coal
The pyrolysis phase is dominant in the case of coking coal and anthracite; when it comes to coals of lower rank, gases are generally released during the gasification process
Summary
In the face of the increasingly restrictive climate and energy policies of the European Union, Poland must look for solutions enabling further use of coal as an energy source. Taking into consideration the transition from coal mining and the combustion of coal for energy production, clean-coal technologies are being actively developed These include the gasification process, which, depending on the technology used, can act as an effective way to reduce carbon dioxide emissions. One way to reduce investment and operating costs and improve the reliability and operation of the reactor is the development of low temperature gasification technologies in a CO2 atmosphere The advantage of this solution lies in its use of an additional carbon dioxide stream as a gasification agent that feeds coal (C element) and oxygen and improves the efficiency of the process. The obtained results will allow the selection of potential deposits that are best suited for gasification in a CO2 atmosphere
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