Brown coal conversion under the action of supercritical water

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Solid Fuel Chemistry (English Translation)

DOI:https://doi.org/10.3103/S0361521907050035· OSTI ID:21037022

Vostrikov, A A; Fedyaeva, O N; Psarov, S A; Dubov, D Y; Sokol, M Ya ^[1]

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1. Russian Academy of Sciences, Novosibirsk (Russian Federation). Kutateladze Institute of Thermophysics, Siberian Division

A test bench was developed and the conversion of the organic matter of coal (OMC) in supercritical water (SCW) was studied under conditions of a continuous supply of a water-coal suspension to a vertical flow reactor at 390-760{sup o}C and a pressure of 30 MPa. From 44 to 63% OMC was released as liquid and gaseous products from coal particles (from the water-coal supension) during the time of fall to the reactor. This stage was referred to as the dynamic conversion of coal. The particles passed through the stage of the dynamic conversion of coal did not agglomerate in the reactor in the subsequent process of batch conversion in a coal layer at T = 550-760{sup o}C. The volatile products of the overall process of the dynamic and batch conversion of coal included saturated hydrocarbons (CH{sub 4} and C{sub 2}H{sub 6}), aromatic hydrocarbons (C{sub 6}H{sub 6}, C{sub 7}H{sub 8}, and C{sub 8}H{sub 10}), synthesis gas (H{sub 2} and CO), and CO{sub 2}. At T < 600{sup o}C, CO{sub 2} and CO were the degradation products of oxygen-containing OMC fragments, whereas they also resulted from the decomposition of water molecules at higher temperatures in accordance with the reaction c + H{sub 2}O = CO + H{sub 2}. The mechanisms were considered, and the parameters responsible for the dynamic conversion of coal were calculated.

• OSTI ID: 21037022
• Journal Information: Solid Fuel Chemistry (English Translation), Journal Name: Solid Fuel Chemistry (English Translation) Journal Issue: 5 Vol. 41; ISSN 0361-5219; ISSN SFCHDV
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHEMICAL REACTION KINETICS
COAL
ORGANIC MATTER
PARTICLES
PRESSURE DEPENDENCE
SUPERCRITICAL STATE
TEMPERATURE DEPENDENCE
WATER