β Scribed by K. Xu
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gas oil fractions are the major constituents (90%) of this coal tar oil. Among the tar collected from the four different coal samples, Pocahontas tar contains the least proportion of these two fractions, while Arch and Amerikohl tars have the greatest abundance of these fractions followed by the Splash Dam coal tar. Steam pyrolysis of Arch and Amerikohl coals would produce raw tars with high yields of carbon black oils.
Briquetting method for biomass coal and its influencing factors Xu, K. et al. Hunnjing Kexue, 2001, 22, (4) 81-85. (In Chinese) A briquetting mechanism using the linkage function of biomass fibre was established for briquetting of biomass coal. The effect of different coal, briquetting pressure, biomass shape and content, and water content on the briquetting performance was studied. The results showed that the briquetting method was suitable for varied kinds coal and biomass. The briquette mechanism performance was improved with the increasing of biomass content, with a reasonable low limitation of -15%.
Pure biomass also could be briquetted.
The briquetting pressure which could consolidate the linkage of biomass fibre was no > 120 MPa. There would be a negative effect at too high pressure. Increasing biomass content and decreasing pressure at certain degree could offset the negative effect of water content significantly, with a permissive limitation over 10% for Datong coal.
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