Relationship between Coal-Water Mixture Concentration and Coal Composition

Abstract

A fuel of coal-water mixture (hereinafter simply called CWM) is preferable to be combustible without being dehydrated. For such an advantage, it is necessary to increase the coal content of CWM by using an appropriate type of coal. The CWM samples with various types of coal were prepared in order to examine how the coal composition had an effect on concentrating the CWM. Following results were obtained:
1) Types of coal remarkably varied the maximum coal concentration (hereinafter called MxCC) of the CWM. However, a highly-loaded CWM could easily be prepared by the use of good dispersants. (Table 1-5)
2) The MxCC of CWM was lowered with an increase in the number of oxygen atoms or of water molecules per 100 carbon atoms in coal. These factors were very closely correlated with each other. (Figs.1-4)
3) The MxCC of CWM was also lowered with an increase in the water wet tability of coal. (Figs.5, 6)
4) The tendencies mentioned in 2) and 3) were also found when such dispersa nts as sodium salt of formalin naphthalenesulfonate condensate and (N-polyoxyalkylene)polyethy lene imine were used. (Figs.1-6)