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Coal Hydrogasification for Cogeneration of Aromatic Hydrocarbon and Methane
Coal hydrogasification refers to the reaction process of pulverized coal and hydrogen under temperature of 800-1000℃ and pressure of 5-7MPa to produce methane, aromatic hydrocarbon and clean semi-coke. Compared with other coal-to-methane technologies, the advantages of coal hydrogasification technology lie in its relatively low reaction temperature, high systemic efficiency (up to 75%-80%), high methane content in the gas product (up to 60%-80%) and low generation of carbon dioxide (less than 3%); meanwhile, the hydrogasification process has better technology economic efficiency than other gasification technologies with its side products including liquid aromatic hydrocarbon products such as benzene, naphthalene, pyrene, phenanthrene, fluorene, etc. Coal hydrogasification is based on coal-based natural gas and can co-generate aromatic hydrocarbon petroleum products with high added values. It is a new clean coal gasification technology that realizes full-value, high-efficiency and clean conversion of coal through graded, quality-divided and gradient utilization.
ENN’s coal hydro-gasification technology has finished the development of the pilot plant with 10t/d coal process quantity and is planning to finish the construction and testing of a hundred-ton level industrial demonstration plant in 3 to 5 yearspilot plants to, aiming to solve a series of key technical problems such as pulverized coal dense phase transportation, hydrogen oxygenation nozzle, hydrogasification furnace, cooling slag discharge control, etc., to achieve over 75% methane content in gas products and over 10% aromatic hydrocarbon oil product yield in the process development and to complete a reactor exaggeration model and a technical software package of a kiloton-level industrial demonstration plant.
Coal hydrogasification has significant meaning for efficient and clean utilization of low-rank coal resources which covers 40% of total national reserves and especially for the subbituminous coal resources with high volatilization.