Abstract
Publisher Summary This chapter discusses coal liquefactions using simulated coke oven gas (COG). The use of inexpensive COG instead of hydrogen gas in coal liquefaction producing solvent refined coal (SRC) that enhances economic feasibility, but few data have reported this matter. Semi-coke formation is predominant with COG than with hydrogen gas. The desirable reaction temperature with COG is around 420°C lower than those for coal liquefaction using hydrogen gas to produce fuel oil. Effective hydrogen supply to fragments generated from coal––due to thermal cracking––is of much importance in coal liquefaction. Hydrogen is supplied from coal, solvent and hydrogen gas, and large amount of molecular hydrogen is consumed during liquefaction and upgrading. Total cost of produced coal liquids depends not only on severity of operating conditions, such as temperature and pressure, but also on the amount of hydrogen gas consumed. COG contains about 50–60 vol% molecular hydrogen, and the cost is by far inexpensive than hydrogen gas.
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