Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


The relationship of the sintering characteristics of lignite ash to the known fouling tendency of the ash was investigated.

The investigation includes the determination of the temperature at which sintering begins and the correlation of fouling tendency of the ash to the compressive strength developed during the sintering of ash specimens. The significance of sample preparation, sodium content, and treatment temperature was determined by statistical analysis of the data.

The temperature at which sintering begins was determined for samples of ash prepared in the laboratory. Differences in this sinter temperature were observed for samples with different fouling tendencies. The sinter point could not be determined for samples of ash which had been prepared by other methods from the same coal.

Compressive strengths developed during sintering were very similar for samples of high-sodium content fly ash and high-sodium content laboratory ash. The sinter strengths of the low-sodium counter-parts of these two ashes were also very similar. The differences in sinter strength developed for the high- and low-sodium content samples of each type of ash also gives a clear indication of the relative fouling tendency.

An analysis of the variance of the sinter strength data indicates that sodium level, sample preparation method and treatment temperature all have a significant effect on the sinter strength.

The relative fouling tendency of lignite ash can be measured using samples of ash prepared is the laboratory, by wither determining the sinter point or the sinter strength developed.