External heating type solid carbon-containing material pyrolysis method and pyrolysis system

Abstract

The invention relates to a solid carbon-containing material pyrolysis system which comprises a circulating fluid bed hearth and a pyrolysis channel, wherein a solid heat carrier flows in the hearth in a fluidized state; granular solid carbon-containing materials containing volatile compounds are added into the pyrolysis channel from the upper part, pass through the pyrolysis channel in a fluidized state from top to bottom under the action of gravity, and is subjected to pyrolysis reaction; the pyrolysis channel is penetrated through the hearth, and the upper end of the pyrolysis channel and the lower end of the pyrolysis channel are positioned outside the hearth; the pyrolysis channel and the hearth are divided by a heat-conducting dividing wall, the solid heat carrier and the solid carbon-containing materials in the pyrolysis channel perform heat exchange through the heat-conducting dividing wall, and the solid carbon-containing materials are heated and subjected to pyrolysis reaction. The invention also relates to a solid carbon-containing material pyrolysis method.

Description

technical field [0001] The invention relates to the pyrolysis of solid carbonaceous materials, in particular to a pyrolysis system and method for granular solid carbonaceous materials containing volatile matter. Background technique [0002] The generation of coal gas, tar and semi-coke through pyrolysis is a high-value utilization method for cascade utilization of low-rank coal resources to obtain high value-added products, with remarkable economic and social benefits. In recent years, oil shale has become the most potential non-traditional hydrocarbon resource recognized in the world. Because its oil content is generally 4% to 20%, and the highest can reach 30%, in addition to combustion for power generation, the main utilization method is carbonization and refining. After the oil shale is heated and carbonized, the kerogen contained in it decomposes to produce shale oil, carbonized gas and shale semi-coke; the shale oil can be used as fuel oil, and can also be further pro...

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Problems solved by technology

However, due to the poor thermal conductivity of coal, the material heating rate is slow and the temperature is uneven in the indirect heat exchange coal pyrolysis process, which easily leads to problems such as long pyrolysis time, low tar yield, and high heavy oil content.

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