Wet start-up method for hydrogenation unit, energy-saving hydrogenation process and hydrogenation apparatus

摘要

The present invention relates to a wet start-up method for hydrogenation unit, an energy-saving hydrogenation process, and a hydrogenation apparatus. The method involves heating a start-up activating oil to a specific temperature and flowing the heated oil through a bed of hydrogenation catalyst bed, so that the temperature at the catalyst bed layer is increased to 180±10° C. or above by means of heat exchange and the reaction heat generated from activation in the start-up method.

主权项

1. A wet start-up method for hydrogenation unit, comprising the following steps:
(a) utilizing a low-temperature heat source to heat up a start-up activating oil, feeding the heated start-up activating oil and a circulating hydrogen into a hydrogenation unit, wherein the hydrogenation unit contains a sulfurized type hydrogenation catalyst, and the sulfurized type hydrogenation catalyst is activated; (b) stopping the use of the low-temperature heat source, utilizing the reaction heat generated from the activating reaction of the sulfurized type hydrogenation catalyst to heat up materials in the hydrogenation unit to 180±10° C., and then introducing an olefin-rich gas and/or olefin-rich light distillate oil into the hydrogenation unit to carry out olefin hydrogenation reaction; (c) utilizing the reaction heat generated from the olefin hydrogenation reaction to further heat up the materials in the hydrogenation unit to 230±10° C., and keeping the temperature constant for at least 4 h; (d) heating the materials in the hydrogenation unit further to a temperature higher than 240° C., reducing the amount of the olefin-rich gas and/or olefin-rich light distillate oil gradually, replacing the start-up activating oil with a feedstock gradually, and utilizing the reaction heat generated from the feedstock hydrogenation reaction to heat up the materials in the hydrogenation unit until the target temperature is reached.