Thermal conduction has causes related to coking
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The coking rate of heat transfer oil is related to the temperature it is exposed to; the highest operating temperature that the best heat transfer oils can withstand at present is 400°C. The flame temperature in a heat transfer oil furnace can exceed 800°C (when coal is used as fuel). The temperature distribution of the heat transfer oil within the furnace is uneven, and the temperature shown by the outlet thermometer is merely the temperature of the heat transfer oil after it has been heated and mixed. The higher the circulation flow rate of the heat transfer oil, the greater the degree of turbulence, which helps to reduce the unevenness in temperature distribution within the furnace. To be precise, reducing the flow rate exacerbates the uneven heating of the heat transfer oil, and the rate of thermal degradation of the heat transfer oil increases.
So, may I ask the original poster, how can we increase the flow rate? By increasing pressure?
The design specifications for heat transfer oil boilers include restrictions on the flow rate of the furnace tubes