Catalyst replacement system and method for slurry bed reactor

Abstract

The invention discloses a catalyst replacement system and method for a slurry bed reactor. The replacement method comprises the slurry bed reactor, a reduction reactor and a residue wax agitating kettle. The replacement method is a replacement method with periodic replacement of a catalyst and massive replacement of the catalyst being combined; the periodic replacement of the catalyst specifically lies in that the catalyst is replaced once every five days, wherein 4.5 tons of catalyst is replaced every time; the massive replacement of the catalyst lies in that the catalyst which is well reduced twice continuously is added to the slurry bed reactor once every month to finish massive replacement. The catalyst replacement system and method disclosed by the invention have the advantages that massive replacement of the catalyst can be realized to ensure that a catalytic reaction system in the slurry bed reactor is always at an efficient state, so that the production efficiency is improved, and the product quality is stabilized; a crushed catalyst can be furthest discharged to prevent the crushed catalyst from blocking a filter pipe, so that the life of the filter pipe is prolonged and the production and maintenance cost is reduced; a remarkable economic benefit can be produced.

Description

Technical field: [0001] The invention relates to a catalyst replacement system and method, in particular to a slurry bed reactor catalyst replacement system and method. Background technique: [0002] The catalyst for the Fischer-Tropsch synthesis reaction needs to be pretreated before use, that is, the catalyst is reduced. The reduced catalyst can obtain a stable active phase for the Fischer-Tropsch synthesis reaction. With the prolongation of the Fischer-Tropsch reaction time, the catalytic efficiency of the catalyst in the Fischer-Tropsch synthesis reaction system decreases, the reaction rate decreases, and the production efficiency is reduced; in order to meet production needs and improve production efficiency, it is necessary to replace a large number of new catalysts in a timely manner . [0003] The original design of the Fischer-Tropsch reaction catalyst is to replace 3.6 tons every 5 days. This operation will cause the Fischer-Tropsch reaction to drop every 3 days a...

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Problems solved by technology

[0003] The original design of the Fischer-Tropsch reaction catalyst is to replace 3.6 tons every 5 days. This operation will cause the Fischer-Tropsch reaction every 3 days after the catalyst is added, the reaction efficiency will decrease, the load will decrease, and the stable operation of the system at high load will be affected.

At the same time, after the catalyst is used for a period of time, it will have a certain impact on the quality of coal-based synthetic wax, especially the melting point and chroma of coal-based synthetic wax, resulting in a reduction in product price or failure to sell

At present, the replacement of the catalyst for the Fischer-Tropsch synthesis reaction still cannot make the system run stably at high load, and cannot guarantee the stability of product quality. At the same time, the broken catalyst is easy to block the filter tube, which increases the cost of production and maintenance.

[0004] However, directly reducing the catalyst in a large amount in the reduction reactor and replacing it will cause the reduction effect to deteriorate and cause the blockage of the distributor in the reduction reactor. Cause pipeline blockage, therefore, cannot realize a large amount of one-time reduction and replace the catalyst with the existing method

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