Co-gasification system and method for coal and petroleum coke

Abstract

The invention relates to the field of carbon-based raw material gasification, in particular to a coal and petroleum coke co-gasification system and method, including a raw material crushing unit, a fluidized bed pyrolysis unit, a fluidized bed gasification unit, an entrained flow gasification unit, a pyrolysis Product cleanup unit, syngas cleanup unit and cyclone separator. Coal powder is pyrolyzed in the fluidized bed pyrolysis unit to produce pyrolytic semi-coke while by-product coal tar and pyrolysis gas, pyrolytic semi-coke and crude petroleum coke are produced by gasification reaction in the fluidized bed gasification unit to prepare and synthesize Gas; fine coal powder and fine petroleum coke powder enter the entrained bed gasification unit for gasification. Pyrolysis gas and synthesis gas respectively enter the pyrolysis product purification unit and synthesis gas purification unit to obtain clean products. The invention realizes the graded utilization of different particle sizes of samples, coal tar and pyrolysis gas are produced by-products at the same time when syngas is prepared, the relative content of minerals in coal is increased through pyrolysis, and the gasification activity of petroleum coke is improved by using minerals in coal to improve Petroleum coke gasification efficiency.

Description

technical field [0001] The invention relates to the technical field of carbon-based raw material gasification, in particular to a coal and petroleum coke co-gasification system and method. Background technique [0002] With the increase of crude oil demand in our country, the deepening of the heavy crude oil and the improvement of the requirements for light distillates such as gasoline and diesel, the delayed coking process has been widely adopted by major refineries, and the output of petroleum coke is also increasing year by year. The proportion of coke gradually increases. According to statistics, the output of petroleum coke from January to October in 2018 alone reached 22.184 million tons. [0003] Except some high-quality petroleum cokes are used as industrial raw materials, others are mainly used for combustion to generate electricity, and the combustion of high-sulfur petroleum coke has brought serious environmental problems. According to the "Law of the People's R...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a system and method for co-gasification of coal and petroleum coke to solve the problems of low petroleum coke conversion rate, low utilization rate and poor petroleum coke gasification reaction activity in the prior art. Polygeneration and increase its added value, while pyrolysis can enrich the minerals in coal, increase the relative content of catalytic active components, and then co-gasify pyrolysis semi-coke and petroleum coke can effectively Improve the gasification reaction activity of petroleum coke and reduce the corrosion of harmful metals in petroleum coke to the furnace wall. The whole system and method can realize the organic coupling of coal polygeneration and petroleum coke utilization

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