Composite external heating type dry distillation machine

Abstract

The invention discloses a composite external heating type dry distillation machine which comprises a cylinder body, an external heating mechanism, an internal heating mechanism, a fume inlet and a heat distribution chamber, wherein materials to be subjected to dry distillation are contained in the cylinder body, and the cylinder body is provided with a cylinder body feed end and a cylinder body discharge end and can horizontally rotate; the external heating mechanism is arranged on the outer wall of the cylinder body; the internal heating mechanism is communicated with the external heating mechanism through a communicating mechanism; the fume inlet is formed in the inner wall of the cylinder body, is near the cylinder body discharge end and is communicated with the external heating mechanism; the heat distribution chamber is connected to the cylinder body discharge end, communicated with the internal heating mechanism and communicated with the fume inlet. According to the composite external heating type dry distillation machine disclosed by the invention, a large quantity of inert gas is unnecessary to interfuse, so that the purity of generated coal gas is enhanced; the filling rate and heat exchange efficiency of the materials are improved, the quality of generated semicoke is more stable, and the pulverization degree of the materials is relatively lower, so that the dust capacity of generated crude gas is greatly reduced.

Description

technical field [0001] The present application relates to the field of low-rank coal processing, in particular to a composite external heating dry distillation machine. Background technique [0002] The low-temperature dry distillation of low-rank coal refers to the processing method of heating coal under non-oxidative conditions to finally obtain tar, gas and semi-coke. This method achieves the purpose of improving the quality of low-rank coal through modification. The dry distillation machine is an important component equipment in the low-temperature dry distillation production process. It should ensure high process efficiency and convenient and reliable operation. Among them, the main requirements are that the retort material is heated evenly, the retort process is easy to control, the available raw material types are wide, the raw coal particle size range is large, and the secondary pyrolysis of the precipitated volatiles is small. [0003] At present, domestic low-temp...

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Problems solved by technology

However, this simple external heating method also has serious shortcomings. Due to the small thermal conductivity and filling coefficient, the coal is not heated uniformly, resulting in uneven tar quality, and under the premise of the same production capacity, the volume of the equipment is much larger. for other types of equipment

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