Internal and external heat combined coal destructive distillation equipment and coal destructive distillation process thereof

Abstract

The invention discloses internal and external heat combined coal destructive distillation equipment and a coal destructive distillation process thereof and aims to solve the problems that the heat value utilization rate is low and the coal gas quality is low in a conventional internal and external heat combined coal destructive distillation method. The equipment comprises an outer barrel, an inner barrel and a flue, wherein a preheating area, a destructive distillation area I and a destructive distillation area II are sequentially formed along the feeding direction; a combustion cylinder is arranged in the inner barrel in the area II; a feeding hole of the combustion cylinder is communicated with the inner barrel in the area II through a local returning spiral, and a discharge opening of the combustion cylinder is communicated with the returning spiral which is arranged on the inner barrel in the area I; raw materials in the coal destructive distillation process are preheated and are mixed with thermal semicoke in the returning spiral; after the mixture passes through the inner barrel in the area I and the area II, one part of the mixture is output to serve as a semicoke product, and other part of the mixture is heated in the combustion cylinder and enters the returning spiral to serve as a heat carrier; the flue gas generated in the combustion cylinder serves as the heat carrier and is discharged through the flue in the process, and the coal gas is not contacted, so that the quality of the coal gas is guaranteed; meanwhile, the heat generated by direct heating in the area II is continuously used for heating and performing destructive distillation on the coal, and the heat utilization rate can be improved.

Description

Technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to an internal and external heat combined coal dry distillation equipment and a coal dry distillation process. Background technique [0002] Common coal dry distillation methods mainly include external heating dry distillation method, semi-coke direct heating dry distillation method (internal heating dry distillation method) and internal and external heating combined dry distillation method. [0003] The external heating type dry distillation method has the disadvantage of low heat transfer efficiency, and because the external heating type dry distillation equipment adopts the heating jacket to be fixed and the inner cylinder rotates, the inner cylinder must have a higher high temperature strength, which will cause The metal inner cylinder is expensive and has the risk of high temperature deformation. At the same time, the inner cylinder of the equipment is an int...

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Problems solved by technology

[0006] One of the objectives of the present invention is to provide a coal carbonization equipment with high calorific value utilization rate and good gas quality, and at the same time solve the problem of difficult transportation of hot semi-coke between two rotary furnaces in the internal and external thermal combined carbonization process

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