Sintering behavior of various coal flying slag particles in the entrained-bed coal gasifiers : (Measurement of sintering temperatures of slag powder containing char and sintering temperatures of various coal slag)

Flying slag particles have a tendency to deposit and sinter on the exit wall of entrained-bed coal gasifiers. A reasonable measurement to calibrate sintering temperatures in slag containing char and measure the relation between sintering temperatures and fusion temperatures of the slag were examined, using eighteen kinds of coal amorphous slag and char. It was found that a dilatometer was very useful in measuring only sintering temperatures of pure slag powder as the shrinkage of slag containing char was not related to sintering, and that the compressive strength method was reasonable in evaluating sintering behavior of the slag containing char. The lowest sintering temperature of slag tested and measured by a dilatometer, was approximately 650°C. It was also found that the sintering temperature of slag was related to the JIS melting point. The sintering temperature increased to approximately 800°C with an increase in the melting point of slag.