Regarding shutdown passivation cleaning
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This time, we shut down our catalytic unit and carried out passivation cleaning of the vapor line at the top of the fractionator. It seems that many units no longer perform such passivation cleaning of their vapor lines; let’s discuss this!
During shutdowns, passivation cleaning is still necessary in order to minimize the spontaneous combustion of ferrous sulfide. During shutdowns, in addition to fractional cleaning, we also carry out passivation cleaning of the desulfurization system; if you need any documentation, I have it here
Our company’s oxygen pipelines, boilers, methanol equipment, process equipment, heat exchangers, compressor cooling systems, as well as all subsequent maintenance tasks are carried out by Sichuan Xiangguang Cleaning Company. They are our partners, and you can get in touch with them in the future – Sichuan Xiangguang Cleaning Technology Co., Ltd
At the top of the tower, there is less FeS formed as a result of injection; most of it exists in the form of a FeS film. This results in limited passivation effects, and it also generates a large amount of chemical waste that is difficult to treat