Analysis is made to the problems in raw gas primary cooling by utilizing waste heat from flushing liquor for current chilling.After taking measures,like treatment for the flushing liquor by stages,optimization for raw gas primary cooling process and increasing the temperature of the flushing liquor into the refrigerator,satisfactory results can be obtained such as higher efficiency of refrigerator unit,lower cost of the unit,and avoidance of blockage in flushing liquor nozzle or tar jamming inside the GCM so that safe and stable operation can be ensured.