Fischer-Tropsch wax and catalyst filtering and back-flushing method for Fischer-Tropsch synthetic slurry bed reactor

Abstract

The invention provides a Fischer-Tropsch wax and catalyst filtering and back-flushing method for a Fischer-Tropsch synthetic slurry bed reactor. The method comprises the following steps of: 1, in production mode, opening a clear solution extracting system, and extracting Fischer-Tropsch wax to a crude wax product buffer tank with set pressure; 2, in the production mode, when the back-flushing time interval value reaches a set value, opening a back-flushing system to back-flushing a filter element; and 3, when the back-flushing time reaches a set value, closing the back-flushing system, and newly extracting the Fischer-Tropsch wax to the crude wax product buffer tank with the set pressure. By automatically controlling a filter system and the back-flushing system and automatically back-flushing the filter element according to the time period or the back-flushing operation pressure difference, the Fischer-Tropsch wax can be stably and effectively extracted from the reactor for a long period, and stable and continuous operation of the Fischer-Tropsch synthetic slurry bed reactor is realized.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis, in particular to a method for filtering and recoiling Fischer-Tropsch wax and catalyst in a Fischer-Tropsch synthesis slurry bed reactor. Background technique [0002] In recent years, with the rapid development of the world economy, energy security has attracted widespread attention from all countries, especially oil, known as the blood of industry, especially in some countries that are rich in coal and short of oil. Coal or natural gas is converted into high-quality liquid fuels and high value-added chemicals through F-T synthesis reaction, which not only makes use of coal resources reasonably, efficiently and cleanly, but also makes up for the relative shortage of petroleum resources, making Fischer-Tropsch synthesis technology researched and developed by various countries Institutions and industries attach great importance to it. Fischer-Tropsch synthesis refers to the reaction proce...

AI Technical Summary

Problems solved by technology

But the use of the three-phase slurry bed reactor also brings new problems. In the slurry bed reactor, 20-200 μm fine Fischer-Tropsch catalyst particles are mixed with liquid hydrocarbons (Fischer-Tropsch wax) products. The effective separation of SF has always been a technical difficulty in the development of slurry bed Fischer-Tropsch synthesis technology.

[0004] Patent CN100443155C discloses a slurry bed circulation reactor and its application. The slurry bed reactor includes a riser and a downcomer. The filter medium in the downcomer is divided into two parts: the filter area and the slurry area. When the pressure difference on both sides of the filter medium When it is higher than the set value, backwashing is performed, and the implementation method of the backwashing filter is not described in detail, and how to achieve it is unknown

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