Suspended bed external separation system and using method thereof

Abstract

The invention relates to the technical field of suspended bed hydrogenation, in particular to a suspended bed external separation system and a using method thereof. The suspended bed external separation system comprises a high-pressure feeding pump, a suspended bed reactor, a primary cyclone separator, a secondary cyclone separator, a fixed bed reactor, a heat exchanger, a cold high-pressure separator and a cold low-pressure separator. The suspended bed external separation system has the following advantages: 1, light and heavy components can be effectively separated through the primary cyclone separator and the secondary cyclone separator, and the heavy components enter the suspended bed reactor again for reaction separation; 2, the operation cycle of the fixed bed reactor at the rear part of the suspended bed reactor is ensured, the pressure drop is reduced, and the service life of a catalyst is ensured; and 3, the heavy oil at the bottom of the suspended bed reactor, which contains more catalyst powder, heavy metals and the like, are discontinuously discharged, so that the load of the suspended bed reactor is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrogenation of a suspended bed, in particular to an external separation system of a suspended bed and a method for using the same. Background technique [0002] At present, in the second-generation biodiesel hydrogenation unit, there is a short operation period of the reaction system, which is mainly manifested in the increase of bed pressure drop in a short period of time and the discoloration of the product, which makes the unit unable to continue to operate. Moreover, the catalyst powder in the suspended bed and the oil containing high heavy metals are carried to the fixed bed reactor through the air flow, so that the catalyst channels of the fixed bed reactor are quickly blocked, the pressure drop of the bed layer increases, and the operation cannot continue. However, the service life of the catalyst is short, resulting in frequent shutdowns such as shutdowns and catalyst replacements, and increased...

AI Technical Summary

Problems solved by technology

[0002] At present, in the second-generation biodiesel hydrogenation unit, the operating period of the reaction system is short, mainly manifested in the increase of bed pressure drop in a short period of time, and the discoloration of the product, which makes the unit unable to continue to operate.

In addition, the catalyst powder in the suspension bed and the oil containing high heavy metals are carried to the fixed bed reactor through the air flow, so that the catalyst channels of the fixed bed reactor are quickly blocked, the pressure drop of the bed layer increases, and the operation cannot continue

However, the service life of the catalyst is short, resulting in frequent shutdowns such as shutdowns and catalyst replacements, and increased production costs.

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