Quick pyrolysis technology for coal

Abstract

The invention provides a quick pyrolysis technology for coal. Feed coal with the particle size of 0-50 mm is firstly fed into a straight tube pyrolysis section with the length-diameter ratio being 40:1, mixed with a high-temperature carrier with the temperature of 850-950 DEG C and subjected to dry distillation under fluidization of raw gas, wherein the rising speed of the raw gas ranges from 2 m/s to 8 m/s. Thus, when the pyrolysis technology is used for conducting coal pyrolysis treatment, heat and mass transfer of cold materials and hot materials can be achieved, pyrolysis is quick, the whole pyrolysis process is controlled to be within 10-30 s, the utilization rate of raw materials is up to 100%, and the tar yield is high.

Description

technical field [0001] The invention relates to a coal rapid pyrolysis process, which belongs to the technical field of coal pyrolysis. Background technique [0002] The salient features of my country's energy resources are rich in coal, low in oil and short of gas. However, at present, coal resources are often used for a single purpose, most of which are mainly for direct combustion, and other gasification and liquefaction are also mainly for a single process. The direct combustion of coal simply uses coal as fuel, and cannot effectively utilize the high-value components contained in coal; and in the individual conversion processes such as coal gasification and liquefaction, the reaction rate of solid particles decreases with the increase of conversion degree. Slow, in order to obtain a higher conversion efficiency, measures must be taken to convert the part that is difficult to convert, which leads to complex technology, huge equipment, high investment and production cost...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, a fluidized bed pyrolysis reactor is used for coal pyrolysis reaction, and the heat and mass transfer of the cold and hot materials inside the reactor is relatively slow, resulting in uneven distribution of the internal temperature field and a rise in temperature. The rate is relatively slow, part of the raw coal flows out of the reactor before the pyrolysis reaction occurs, and the tar yield is relatively low. Therefore, a rapid coal rapid heat transfer method that can realize rapid heat and mass transfer of cold and hot materials, fast pyrolysis, and high tar yield is proposed. Pyrolysis process

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