No-catalyst coal-based heavy components quality improvement method

Abstract

The invention belongs to the coal low-temperature pyrolysis tar technology and provides a no-catalyst coal-based heavy components quality improvement method, in order to solve the problem that in theheavy oil quality improvement processes such as catalytic hydrogenation and catalytic cracking, the condition limit is higher than 400 DEG C, it is a concentration point of large energy consumption, economy reduction and technical difficulty improvement for the whole process, the condition of heavy component hydrogenation is harsh, and the catalyst deactivation is a difficult problem in the process of catalytic hydrogenation. The heavy components adopt the fraction of the medium and low temperature coal tar at 350 DEG C or above, the biomass adopts 40-60 mesh pine sawdust which is dried at 100DEG C for 12 hours; a hydrogen-supplying solvent is analytical pure tetra-hydronaphthalene and used for coal-based heavy components quality improvement. After the addition of biomass pine sawdust, the yield of n-hexane soluble matter of the heavy components of the mixed reaction raw materials increases from 66.63% to 75.46%, the addition of biomass pine sawdust promotes the lightweight process ofthe heavy components, and the product components are relatively concentrated. The reaction temperature can be reduced to 320 DEG C, which is of great significance for practical application.

Description

technical field [0001] The invention belongs to the technical field of coal low-temperature pyrolysis tar, and in particular relates to a catalyst-free coal-based heavy component upgrading method. Background technique [0002] China is relatively rich in coal resources, of which low-rank coal reserves account for about 55%. Coal graded conversion technology based on coal pyrolysis is an important way to realize the clean and efficient utilization of low-rank coal. However, the yield of tar produced by the currently operating pyrolysis device is low and the content of its heavy components is high. Higher heavy components not only make the quality of tar poor and difficult to process and utilize, but also tend to condense and block equipment, affecting pyrolysis stable operation of the system. For the coal pyrolysis process, there are mainly two effective ways to realize the lightening of tar in the research. One is to introduce hydrogen-rich substances to co-pyrolyze with c...

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Problems solved by technology

[0004] At present, most heavy oil upgrading processes use catalysts for catalytic hydrogenation, and catalysts are added in the temperature window where hydrogenation and cracking can be performed to improve the degree of lightening heavy oils. Currently, the catalysts used are mainly transition metal catalysts such as Fe, Ni, and Mo. , but the addition of catalyst will increase the cost of the heavy oil hydrogenation process and reduce its economy

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