Deep preparation technology of coal for direct coal liquefacation

Abstract

The invention discloses a deep preparation technology of coal for direct coal liquefacation. Feed coal is selectively crushed and then is sieved with a 0.5 mm particle size to grade; products passing through the sieving are separated through gravity concentration equipment, so as to obtain gravity treated cleaned coal, gravity treated middlings and gravity treated tailings; the gravity treated middlings is ground and fed into size mixing equipment; flotation reagent is added to the size mixing equipment, size mixing is performed, and then products are pumped into flotation equipment to perform separation, so as to obtain flotation cleaned coal and flotation tailings; the flotation cleaned coal is filtered and dried and then mixed with the gravity treated cleaned coal to form rich-vitrinite coal which is served as coal for direct coal liquefacation; and the products of the feed coal not passing through the sieving after crushing and sieving, the gravity treated tailings and the flotation tailings are mixed into rich-inertinite coal which can be served as high-quality steam coal, coal for gasification and the like. The technology is based on coal petrography maceral, adopts the differences in terms of densities and surface natures of different coal petrography maceral, and adopts the method of the combination of gravity concentration and flotation, so as to realize the large-scale separation and enrichment of coal maceral, increase the hydrogen-to-carbon ratio of coal for liquefacation, greatly improve the oil yield of direct liquefacation of coal, and obviously increase the economic benefit of direct liquefacation of coal.

Description

technical field [0001] The invention relates to a coal deep processing technology, in particular to a coal deep preparation technology for direct liquefaction of coal which is suitable for separating and enriching different coal rock components on the basis of coal rock organic microscopic components. Background technique [0002] Coal direct liquefaction is an advanced clean coal technology that converts coal into clean liquid fuels (gasoline, diesel, aviation kerosene, etc.) or chemical raw materials that are easy to transport and use. my country is a country rich in coal and low in oil. The direct liquefaction of coal can make up for the shortage of oil resources in our country, which is of great strategic significance; compared with coal, oil is a clean, convenient and efficient energy source with little environmental pollution. It is beneficial to environmental protection and can provide new development space for the coal industry. [0003] Due to the complexity and het...

AI Technical Summary

Problems solved by technology

But at the same time, the content of exinite in the microscopic components of coal rocks in the Shendong area is extremely low, and the content of inert components that are not suitable for direct coal liquefaction is generally higher than 30%, even as high as 60%, and the content of inertinite is high. And the instability significantly affects the oil yield of direct coal liquefaction

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