Method for manufacturing wet fuel by rapid common thermal decomposition of biomass and coal

Abstract

The invention provides a method that a biomass and coal are pyrolyzed rapidly to prepare liquid fuel, which belongs to the technology field of energy and chemical industry. The reaction system consists of a riser combustion reactor (10) and a biomass / coal rapid co-pyrolysis reactor. The two reactors are linked circularly through a solid heat carrier. A pyrolysis reactor consists of an upper pyrolysis reactor mixing section (5), a middle pyrolysis reactor cocurrent pyrolysis section (6) and a lower pyrolysis reactor gas-solid separation section (7); the quality ratio of the biomass and the coal is 95 / 5 to 50 / 50; the byproduct hydrogen rich gas led for circular reuse in the pyrolysis reactor is regarded as carrier gas and quenching gas; the co-pyrolysis char is completely burnt in the riser combustion reactor (10). The beneficial effects of the invention are capable of operating under normal temperature, simple in process, high in heat efficiency, high in liquid fuel yield, good in quality and suitable for the co-pyrolysis liquefaction of the solid biomass and low rank coal.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and relates to a method for rapidly co-pyrolyzing biomass and coal to prepare liquid fuel. Background technique [0002] Fast pyrolysis from biomass or coal is one of the most efficient methods to obtain liquid fuels and chemicals, but individual pyrolysis of biomass or coal has its limitations. [0003] The H / C ratio of coal is low, therefore, the yield of pyrolysis liquid products is low. The yield of coal pyrolysis semi-coke is generally greater than 50%, therefore, its application must be considered. When low-quality coal (high ash, high sulfur) is used for pyrolysis, the utilization of semi-coke becomes a difficult problem. In order to increase the yield of liquid products, rapid pyrolysis in a hydrogen-rich environment is required, that is, coal hydropyrolysis, but the source of hydrogen is a big problem. At present, hydrogen or alternative hydrogen sources (such as n...

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Problems solved by technology

In addition, the carrier gas in this reactor plays the role of isolating coal and biomass particles, and the abundant hydrogen in biomass is not easily transferred to coal, which also makes it difficult for synergistic reactions to occur (references: Hindmarsh C J, Thomas K M, Wang W X et al. A comparison of the pyrolysis of coal in wire-mesh and induced-flowreactors. Fuel, 1995, 74: 1185-1190)

Rapid heating in the settling furnace (10 4 °C / s) and short residence time, the co-pyrolysis results of coal and biomass failed to find any obvious synergistic effect

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