Treatment of the issue of excessively high wall temperature in the residue hydrogenation furnace tubes
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The specified wall temperature for the tubes in our residue hydrogenation reactor is no more than 520 degrees, but in actual operation it is kept below 500 degrees. Recently, there have been several points where the temperature has risen slightly above 500 degrees; we’re not sure why this is happening. We would also like to ask those with expertise whether it’s necessary to carry out coking treatment for the residue hydrogenation reactor. We appreciate any guidance from those experienced in this field.
We resolved this issue effectively when we stopped operations in March; there was no burning, and the furnace tubes were purged with steam. Since then, up to now, there has been no occurrence of any spots on the furnace tubes having excessively high temperatures.
Reply to 2# zhg20051007: Is it necessary to install a coking tank for hydrogen mixing in front of the furnace? I’ve seen cases where hydrogen mixing is done behind the furnace without such a coking tank. During your maintenance work, there was no burning, and steam purging was used directly – so what is the pressure of the purging steam? Blowout cleaning?