The first prevention is to prevent hydrocarbons from entering the main condensate evaporator as much as possible by correctly operating the front-end purification and adsorption device: in addition to removing water in the process air, the purification and adsorption device must be able to remove CO2 very effectively. Monitoring the content of CO2 in the purified air not only helps to correctly operate the purification adsorption device to remove CO2 and hydrocarbons, but also reduces the possibility of blockage of the main condensate evaporator channel caused by solid CO2. If CO2 penetrates the purification adsorption device, the switching operation cycle of the two purifiers shall be reduced accordingly.
The second way to prevent hydrocarbon from draining in the main condensate evaporator is to continuously drain the liquid from the bath liquid of the condensate evaporator. The compression process in the liquid oxygen pump is adopted, and the product oxygen leaves the distillation tower in liquid form, so the possibility of hydrocarbon accumulation is very small. Despite these precautions, some impurities may still deposit on the corrugated sheets of the main condensing evaporator after a period of time. As an additional measure, the main condensing evaporator must be cleaned by thorough defrosting within the heating cycle specially determined for the unit. To ensure effective defrosting, the temperature and moisture of the defrosting gas at the outlet of the main condenser evaporator shall be monitored. The defrosting can only be stopped when the required dryness and temperature are reached.
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