COAL HYDROPYROLYSIS IN SWEPT FIXED-BED REACTOR - INFLUENCE OF THE COAL BED HEIGHT ON THE DISTRIBUTION AND NATURE OF THE HYDROCONVERSION PRODUCTS

In this paper, the hydropyrolysis of a low-rank coal in a swept fixed bed (SFB) reactor was carried out by fixing the hydrogen pressure (40 kg/cm(2)), the hydrogen flow (2 L/min), and the residence time (10 min ) at increasing temperatures (400, 500, and 600 degrees C). In additio n, the coal bed height (h, 1.5h, 2h, 2.5h, and 3h) was modified by inc reasing the coal loading weight of the fixed bed. This is the first ti me that the influence of the coal bed height on the distribution and c haracteristics of the hydroconversion products has been analyzed. In a ll of the experiments carried out, regardless of the hydropyrolysis te mperature, the percentages of tars and char directly depend on the coa l bed height. It is also demonstrated that there is not only a quantit ative dependence, but that also the height of the coal bed is very imp ortant and plays an important role in the nature of the conversion pro ducts from hydropyrolysis.