Under what circumstances during coal tar processing is coking likely to occur in the tubes of a tubular furnace?
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Under what conditions during coal tar processing is coking likely to occur in the tubes of a tubular furnace?
In my opinion, there are two aspects: 1. Temperature – temperature is the key factor; when it is too high, the flow rate inside the furnace tubes decreases and the residence time increases, leading to local overheating and thus coking. 2. Continuous operation of the pump: If a two-stage pump does not deliver fluid for an extended period of time and the furnace temperature fails to drop, it is very likely that localized carbonization will occur inside the furnace tubes. When the pump starts operating again, the flow rate within the tubes decreases, resulting in extremely high pressure at the pump head; this leads to significant coking, and in severe cases, the entire furnace tube can become blocked.