Will using 370-degree heat transfer oil to heat asphalt cause coking?
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Asphalt with a softening point of 60 degrees is transferred to a 40 m3 intermediate storage tank (outdoor) at 300 degrees, where it remains for 8 to 12 hours. I would like to ask: 1) Will heating with 370-degree heat transfer oil coils cause coking? 2) Will heating asphalt with a softening point of 120 or 180 degrees to 320–340 degrees using 370-degree heat transfer oil cause coking? 3) Will using 370-degree heat transfer oil for insulation of asphalt with a softening point of 260–280 degrees cause coking?
As long as it is drained completely each time, coking will not occur
It mainly depends on the extraction temperature of the asphalt, or the inlet temperature of the asphalt into the heat exchanger; if it is above 370 degrees, crystallization should start, and in such cases it’s necessary to use heat transfer oil with a higher operating temperature. Sometimes a high softening point does not mean a high asphalt extraction temperature; it depends mainly on the process used. For reference only
What the original poster is asking about is whether asphalt will coking. Based on my many years of practical experience, asphalt does not coke at 370 degrees.
What kind of heat transfer oil can reach 370 degrees? If the heat transfer oil reaches 370 degrees, I estimate that it will coking.
1. One cannot simply consider just how many degrees are required for the asphalt’s softening point in order to determine whether coking will occur; what’s crucial is the state of the asphalt itself. 2. If the temperature is too high, it’s likely that heat transfer oil won’t be effective for heating; whereas if the temperature difference is too small, the heating effect will be poor