【Learning from Others: Anqing Petrochemical’s Minor Renovations to Eliminate Major Hazards in Environmental Protection Equipment and Slag Dewatering Vessels】

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Anqing Petrochemical’s minor modifications eliminate major hazards in environmental protection equipment 2019-01-23 Source: Sinopec News Network On January 18, the Thermal Power Department of Anqing Petrochemical carried out modifications to the slag dewatering tank of Unit 1, thereby completely eliminating the problems associated with this environmental protection equipment, such as its high failure rate and the difficulty in carrying out maintenance tasks. The slag dewatering bin is a device used in coal-fired power plants to store boiler slag and separate the slag from water. The leached ash water and overflow water are further treated by subsequent equipment before being reused; the dehydrated ash is then transported away for comprehensive utilization. This approach not only saves water resources but also reduces environmental pollution, making it an extremely important environmental protection device in coal-fired power plants. The slag dewatering tank No. 1, which is part of this furnace dust area, was built in 2005; the first-generation central water separation filtration method it used presented numerous problems during operation. The central water separation element is secured by six tension rods arranged vertically. Due to the corrosion caused by slag water and the impacts during slag discharge, these tension rods break frequently. Each time maintenance is required, scaffolding over ten meters high must be built; this not only poses significant risks associated with working at heights but also prolongs the maintenance time, thereby affecting the safe and reliable operation of the slag water environmental protection system. On January 10, during operation, water separation and fracture was detected at the center of slag dehydrating bin No. 1; therefore, it was decided to inspect and modify this part of the slag handling area. By changing the water drainage method from central to peripheral, inspections and maintenance can be carried out on the platform, which not only eliminates the risks associated with working at heights but also significantly improves the reliability of the slag water environmental protection system. (Guo Chuangang, Wei Hengguo)