Abstract:The pH value of waste heat boiler water is a strictly monitored parameter during boiler operation, once the pH value of boiler water exceeds the normal range, it will bring serious consequences to the safety of boiler operation. Combined with the production practice, the reasons for the high or low pH value of boiler water and its harm are briefly analyzed, and some preventive measures are put forward to ensure the safe and economic operation of the boiler, so as to prevent the occurrence of accidents.