On-line catalyst loading and unloading method and system for fluidized bed residual oil hydrogenation process

Abstract

The invention discloses an online catalyst loading and unloading method and system for a fluidized bed residual oil hydrogenation process. The method comprises the following steps: adding a used catalyst in a second reactor into a first reactor, enabling the catalyst to participate in a residual oil hydrogenation reaction, discharging the catalyst after part of the catalyst loses activity, and then adding a new catalyst into the second reactor. The system comprises a first reactor, a second reactor, a loading and unloading tank and a conveying oil storage tank, the bottom of the first reactor and the bottom of the second reactor are communicated with the loading and unloading tank through pipelines, the loading and unloading tank is communicated with the top of the first reactor and the top of the second reactor through pipelines, and the conveying oil storage tank is communicated with the loading and unloading tank through a conveying oil inlet pipe. And the conveying oil inlet pipe is provided with a conveying oil heater. By changing the loading and unloading mode of the catalyst, the problem of coking caused by over-high conversion rate due to over-high activity of the catalyst at the bottom of the first reactor is solved, and meanwhile, the loss of a new catalyst in the second reactor is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to an on-line loading and unloading method and system of a catalyst for a fluidized bed residual oil hydrogenation process. Background technique [0002] At this stage, the ebullated bed residual oil hydrogenation technology is generally used to achieve the lightening of the residual oil. In this process, nickel-vanadium metal, nickel-molybdenum metal or nickel-cobalt metal, etc. are usually used as catalysts, and the raw oil is subjected to hydrocracking reaction in the first reactor and the second reactor in sequence. During this process, the activity of the catalyst in the first reactor and the second reactor needs to be ensured by adding new catalyst every day and discharging the used catalyst, which contains spent catalyst, coke, residual oil, etc. During the operation of the system, it is necessary to sample and analyze the content of nickel-vanadium metal, nickel...

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Problems solved by technology

[0010] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a catalyst online loading and unloading method and system for ebullated-bed residual oil hydrogenation process, to solve the catalyst activity reduction in the second reactor, the first reactor Technical problems such as unstable catalyst activity, coking, and production fluctuations caused by the oil transported into the second reactor caused by excessive increase in catalyst activity

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