How can the heavy oil heat exchanger be purged quickly and thoroughly during shutdown?
Thread Content
We have installed heat exchangers for coking feedstocks. When it comes to cleaning the heat exchangers in the pressure-reduction section during shutdown and purging, it is very difficult to clean them thoroughly; it usually takes four to five days. Do any of you have any good methods?
Light oil or diesel can be used first to replace the heavy oil, followed by steam purging; additionally, a pressure buildup blasting method can be employed for purging, involving the repeated opening and closing of the inlet and outlet valves of the heat exchanger.
The pressure-holding burst purging method involves continuously opening and closing the inlet and outlet valves of the heat exchanger to carry out purging. We did the same thing, but it didn’t work well
If conditions permit, the wax oil or diesel that is discharged during shutdown should be introduced into the raw material buffer tank; the heat exchanger should then be replaced for a period of time, followed by repeated pressurized blasting purges.