关键词: 柴油加氢精制, 鸟巢保护剂, 积垢, 卸剂粉末, 元素组成

Abstract: In terms of the increasing bed pressure drop of diesel hydrorefining unit in a refinery, the nest form guard catalyst particles at the top of the bed and the powders deposited between the particles were collected. The samples were characterized by X-ray diffraction (XRD), X-ray fluorescence spectrometer (XRF), carbon-sulfur analyzer, scanning electron microscope (SEM). The analysis results showed that the increasing pressure drop of the reactor bed was because the excessive content of Fe, Ca, Si, P in the feedstock. Fe, Ca and other impurities fell off the surface of the guard catalyst and filled between the guard catalyst particles, leading to the increased pressure drop of the reactor bed. And it was difficult for the guard catalyst to intercept Si and P, since they can easily penetrate into the catalyst bed, resulting in the permanent deactivation of the hydrogenation catalyst.

Key words: diesel hydrorefining, nest form guard catalyst, deposition, catalyst powder, elementary composition