Investigation on pH influence for the effective transportation of coal water slurry using experimental design

The present study aims to identify the pH values in preparation of coal water slurry (CWS) that were evaluated. Rheological characteristics and stability of coal water slurry (CWS) were observed with two types of impellers at pH varying from 6.99 to 7.24. The results showed that the concentration of coal water slurry, rheological characteristics and stability of CWS for propeller and rushton impellers. The parameters that are most effected on the objectives are impeller speed (N) and ratio of clearance height with diameter of tank (C/T). The third parameter, ratio of slurry height with tank diameter (Z/T), is not effecting on output. The pH values of concentrated coal water slurry are favorable to transport to coal gasifier. For propeller impeller, the pH values vary from 6.99 to 7.15; for Rushton impeller pH values vary from 7.12 to 7.24 comparatively Rushton impeller having more base which is most favorable and obtain good CWS concentration. The influence of coal particle size is also investigated on pH values for optimal parameters of equipment.

Automated summary

The present study aims to identify the influence of pH values on the rheological characteristics and stability of coal water slurry (CWS). The results showed that the impeller type, impeller speed, and the ratio of clearance height with diameter of tank were the key parameters affecting the properties of CWS. pH values have a significant impact on the concentration and stability of CWS.