介绍了LWH-106D缓蚀剂在某催化裂化装置中的应用，分析了湿硫化氢对催化裂化设备的腐蚀机理及防护。实际应用结果表明，LWH-106D缓蚀剂对催化分馏塔顶的冷换设备和管线防腐效果良好；水样中的铁离子浓度由2.41 mg/L下降到0.29 mg/L，pH平均值为9.19，降低了设备的维修费用，保证装置长周期运行。

The application of LWH-106D corrosion inhibitor in a catalytic cracking unit is introduced.The corrosion mechanism of hydrogen sulfide on catalytic cracking equipment are analyzed and the corresponding protection methods are discussed.The results show that the LWH-106D corrosion inhibitor exhibits good anti-corrosion effect for the cold change equipment and pipelines at the top of the catalytic fractionation tower.The iron ion concentration in water samples decreases from 2.41 mg·L^-1 to 0.29 mg·L^-1,and the average pH value is 9.19,which can lower the maintenance cost of the equipment and ensure the long cycle run of the facility.