2011, №4

сс. 59-75

Conversion of brown coal in sub- and supercritical water at cyclic pressurization and depressurization

2011, №4

сс. 59-75

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O.N. Fedyaeva, A.A. Vostrikov, A.V. Shishkin, M.Ya. Sokol, L.S. Borisova, V.A. Kashirtsev

Key words: supercritical water, brown coal, conversion, sulfur and oxygen removal

Conversion  of brown coal in sub- and supercritical water at 310÷460 °C and pressures up  to 30 MPa in the cyclic pressurization and depressurization modes is studied.  The temperature dependences of coal organic matter (COM) conversion, yield of  volatile and condensed products are obtained. Temperature dependence of  condensed substances yield has a maximum at 370 °C. At rising temperature the  fraction of high-molecular substances in condensed products is increased.  Cumulative conversion of COM into volatile and condensed products at heating to  460 °С was correspondingly  31.4 and 8.6 %. According to the data of  mass-spectrometric analysis of volatile products, elemental analysis of initial  coal, carbonaceous residue after conversion and condensed products, 82.3 % of  oxygen and 74.7 % of sulfur are removed from COM. The main products of  conversion of oxygen and sulfur containing groups are CO2 and H2S.

doi:10.1134/S1990793111080069