Coal dry distillation method and device for realizing same

Abstract

The invention discloses a coal dry distillation method and a device for realizing the same, which are used for solving the problems of low heat value utilization rate and high equipment manufacturing cost of the existing external-heat dry distillation technology, coal gas mixing in nitrogen in the internal-heat dry distillation technology and difficult semi-coke conveying of the internal / external-heat combined dry distillation technology. In the invention, the coal is subjected to dry distillation sequentially through an external-heat heating area, an internal-heat combustion area and an external-heat heating area with different temperatures and is heated by taking the hot semi-coke generated in the internal-heat dry distillation area as raw material coal, and the smoke generated in the internal-heat heating area is discharged. The device comprises an outer barrel, an inner barrel and a flue between the outer barrel and the inner barrel, wherein a combustion barrel internally communicated with the flue is mounted in the inner barrel, and a horizontal return screw is arranged on the outer wall of the inner barrel and the combustion barrel, thus the coal heating and dry distillation time is prolonged; and meanwhile, the isolation between the direct and indirect heating of the smoke and the coal gas is realized, the quality of the coal gas is guaranteed, and the production efficiency and the dry distillation heat efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a coal dry distillation method and a device for realizing the method. Background technique [0002] Common coal carbonization methods mainly include external heating carbonization method, semi-coke direct heating carbonization method (internal heating type carbonization method) and internal and external heating type combined carbonization method. [0003] The external heating dry distillation method has the disadvantage of low heat transfer efficiency, and because the external heating dry distillation equipment adopts the method of fixing the heating jacket and rotating the inner cylinder, 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 integral structure, which is inconveni...

AI Technical Summary

Problems solved by technology

[0003] The external heating dry distillation method has the disadvantage of low heat transfer efficiency, and because the external heating dry distillation equipment adopts the method of fixing the heating jacket and rotating the inner cylinder, 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 integral structure, which is inconvenient to operate due to the large volume and weight of the equipment during installation and disassembly

[0004] Due to the direct contact between air and coal in the internal heating dry distillation process, the gas produced during the dry distillation process contains too much carbon dioxide, ammonia and nitrogen, which will bring inconvenience to the subsequent gas treatment and lead to poor quality of the final gas

[0005] The usual method of combined internal and external heating dry distillation process is to install a set of rotary devices on the basis of external heating dry distillation equipment, which is specially used for internal heating of semi-coke. The heated semi-coke is separated from the flue gas and then enters the external heating type. Dry distillation equipment, this process requires a lot of investment, many hot semi-coke transportation links between the two rotary furnaces, difficult transportation, high equipment failure rate, high heat consumption, large-scale production equipment, large area occupation, and uneconomical equipment operation

Images