Let’s brainstorm about what causes coal tar to coking during the heat exchange and heating process.
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Let’s brainstorm: what causes coal tar to coking during the heating process in heat exchange! The gum and asphaltenes in the raw materials cause coking; high operating temperatures, slow flow rates, long residence times, and non-turbulent flow at the heat exchange surface?
High temperature, too much gelatin, and too many large particle powders
In response to the comments on the layout, high temperature is one of the reasons; could it be that the efficiency of the heat exchanger is insufficient, leading to coking at high temperatures? My understanding is limited, so this is just a one-sided reply
What causes coal tar to coking during the heat exchange and heating process? . . . Once the equipment is finalized, the problems mainly arise from too rapid heating during operation, excessive temperatures, and long residence times.
I believe the fundamental reason is that coal tar is a product of coal pyrolysis; it contains large amounts of olefins, dienes (which facilitate coking), resins, asphaltenes, etc. Moreover, coal tar contains a high volume of coke dust suspended in it, which accelerates the heating and coking process at the coking centers, allowing coking to occur even at very low temperatures. The external factors are excessive temperature and long residence time.