HAMON电除尘器故障分析及应对措施

Fault analysis and countermeasures of HAMON electrostatic precipitator

HAMON电除尘器可用于处理催化裂化烟气中的催化剂粉尘。由于催化裂化装置四年一修,电除尘器不能随时停运检修,因此针对HAMON电除尘器的运行情况进行研究,对于保障电除尘器及催化裂化装置的长周期稳定运行具有重要意义。在运行过程中,电除尘器出现电流和电压降低的问题。对故障原因进行分析,并在电除尘器停运后进行检查,发现:腐蚀泄漏导致电除尘器内部烟气湿度大。制定了检查、检修项目,更换了配件,同时结合冷态试验结果,调整了电除尘器的电流、电压、振打周期和振打力度。检修开工后,电除尘器入口粉尘质量浓度53.3 mg/m^(3),出口粉尘质量浓度4.8 mg/m^(3),远低于设计值(30 mg/m^(3))。检修开工至今超过2 a,电除尘器运行平稳,未出现任何故障,实现了长周期稳定运行。

HAMON electrostatic precipitator can be used to treat catalyst dust in FCC flue gas.Due to the four-year maintenance of FCC unit,the electrostatic precipitator cannot be shut down for maintenance at any time,therefore,studying the operation of the HAMON electrostatic precipitator is of great significance for ensuring the long-term stable operation of the electrostatic precipitator and FCC unit.During operation,the electrostatic precipitator experiences a decrease in current and voltage.After analyzing the cause of the malfunction and conducting an inspection after the shutdown of the electrostatic precipitator,it is found that corrosion leakage causes high flue gas humidity in the internal of the electrostatic precipitator.We have established inspection and maintenance items,replaced accessories,and adjusted the current,voltage,rapping period and rapping intensity of the electrostatic precipitator based on the cold test results.After the maintenance start-up,the dust concentration at the inlet of the electrostatic precipitator is 53.3 mg/m^(3),and the dust concentration at the outlet is 4.8 mg/m^(3),which is much lower than the design value(30 mg/m^(3)).The maintenance has been suspended for over 2 years,and the electrostatic precipitator operates smoothly without any faults,achieving long-term stable operation.