Coal tar suspended bed coupled fixed bed hydrocracking process and device

Abstract

The invention discloses a coal tar suspended bed coupled fixed bed hydrocracking process and a device, the device comprises a catalyst storage tank, the catalyst storage tank is connected with a catalyst mixing tank, and the catalyst mixing tank is connected with a catalyst feed pump; and also comprises a coal tar buffer tank, wherein the coal tar buffer tank is connected with an oil slurry feeding pump, the oil slurry feeding pump is connected with a first heating furnace, the first heating furnace is connected with a hydrogen heating furnace, and the hydrogen heating furnace is connected with the first suspended bed reactor; the coal tar buffer tank is also connected with a first vacuum tower, the first vacuum tower is connected with a second heating furnace, the second heating furnace is connected with a hot low-pressure separator, the first suspended bed reactor is connected with a second suspended bed reactor, an outlet of the second suspended bed reactor is connected with a hot high-pressure separator, and the hot high-pressure separator is connected with a cyclone separator and a hot medium-pressure separator; the cyclone separator is connected with the fixed bed reactor. The process is short in technological process, high in conversion rate and light oil yield and low in energy consumption, the interior of the reactor and a feeding and mixing system are not prone to being blocked, and a pressure reduction system is not prone to being abraded.

Description

technical field [0001] The invention belongs to the technical field of coal tar processing, and in particular relates to a coal tar suspended bed coupled fixed bed hydrocracking process and device. Background technique [0002] Compared with the three residual oil processing methods of fixed bed, ebullating bed and moving bed, the suspension bed hydrocracking process is simple, and has good adaptability to low-quality heavy oil with high sulfur, high viscosity and high carbon residue, and can also be processed in an appropriate amount Partially pulverized coal; the comprehensive investment of the project is small, the operation flexibility is large, and the start-up time is long; the product has the advantages of high conversion rate, high gas-to-diesel ratio, high demetallization rate, etc., and has broad development prospects in the hydrotreating of inferior heavy oil. [0003] The downstream of the existing domestic suspended bed hydrocracking process must have an indepen...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a coal tar suspension bed coupling fixed bed hydrocracking device, which solves the problem of easy blockage of the reactor feed system of the existing suspension bed coupling fixed bed hydrocracking device and the decompression system caused by single-stage decompression easy wear problem

[0005] Another object of the present invention is to provide a coal tar suspended bed coupled fixed bed hydrocracking process, which solves the problems of low conversion rate of heavy component coal tar and low yield of light oil in the existing suspended bed coupled fixed bed hydrocracking process and Reactor coke clogging problem

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