高濃度石炭-水スラリー (CWM) のレオロジー特性

概要

論文の詳細を見る
Coal-water mixtures (CWM) are usually sheared at different rates by pumping, atomization and other steps in proceeding from production to combustion. Thus. a through knowledge of their rheological characteristics in advance is important for determining the most appropriate handling procedure. The authors examined CWM samples of various coal concentrations, and obtained the following results. <BR>1) CWMs containing no additives are Newtonian fluids, at a coal concentration less than 10%.They became pseudo-plastic fluids on increasing the coal concentration.<BR>2) Two highly loaded CWMs, one with a multi-branched high molecular nonionic surfactant and the other with the sodium salt of the formalin naphthalenesulfonate condensate, showed pseudoplastic flow. <BR>3) For both types, on bringing the coal to a certain concentration, pseudoplasticity suddenly increased. At a lower coal concentration, CWM containing a nonionic surfactant was rapidly converted to Newtonian fluids. CWMs possessing an anionic surfactant gradually lost pseudoplasticity. <BR>4) A CWM showing pseudoplasticity at a low coal concentration can be produced from coal with high oxygen content.
社団法人日本油化学会の論文