Regarding the cooling of organic heat carrier boilers
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Dear colleagues, in the company’s methanol cracking hydrogen production system, there is a 2300KW horizontal gas-fired organic heat carrier boiler. A few days ago, it was shut down for temperature reduction and pipe replacement; according to the procedures, the oil temperature needs to be reduced below 100°C. However, due to the lack of ventilation in the furnace and reliance solely on the oil pump for circulation, the cooling process was slow, which affected the schedule. I would like to ask fellow users for quick and effective ways to reduce temperature (trying to use water evaporation in the vapor superheater didn’t work very well). Thank you!
Is considering forced purging of the furnace chamber?
Make good use of the expansion tank and oil storage tank for cold oil replacement.
Thank you for the reply! Forced ventilation was also considered, but it is difficult to implement. The fan attached to the burner has low power, and the other high-power fans do not have air inlets. Cooling by replacing the oil with cold oil was also tried, but the oil level in the expansion tank was low to begin with; as a result, the oil temperature dropped rapidly in a short period of time. However, once the replacement was complete, the oil temperature started to rise again. Don’t gas boiler manufacturers consider the need for maintenance or cooling in case of abnormalities?
In abnormal situations, cold oil replacement is initiated, and finally the compression air is used to empty the pipe. If there is local oil leakage and sparking, activate the inert gas to purge the furnace chamber. Question: The burning has stopped, and with no source of heat, to what extent will the temperature rise?
The cold oil replacement path can be not just the expansion tank, but also the oil storage tank. It’s not a big problem to pour some of the return oil into the oil storage tank; moreover, the oil from the storage tank is poured into the expansion tank (of course, there are other ways of doing this, and different places may have their own methods, but they are generally similar). Take a look at the instruments on the pipelines connected to the boiler; boiler manufacturers certainly don’t take this aspect lightly.
If nothing else works, pump the oil from the system into the storage tank; that’s exactly what the storage tank is for
The best approach is to replace the oil inside the pipeline.