Coal heat carrier dry distillation system and method thereof

Abstract

The invention relates to a heat carrier destructive distillation system for coal, which comprises a raw coal cabin, a flash dryer, and a circulating fluidized bed air heating furnace, wherein a spiral metering conveyor I is arranged at the bottom of the raw coal cabin; a flash dryer is connected with a drying primary separator and an air heating furnace twice cyclone separator; the drying primary separator is connected with a drying secondary separator and a mixer; the air heating furnace twice cyclone separator is connected with a cooling paddle machine and a waste heat boiler; the waste heat boiler is connected with an air heating furnace once cyclone separator connected with the mixer and the circulating fluidized bed air heating furnace; the mixer is connected with an internal thermal rotary gas retort; a separator is connected with a cooling tower and a fluidized bed grading cooler; the cooling tower is connected with a coal gas air blower and a tar oil cooler; the fluidized bed grading cooler is connected with a semi-coke delivery pipe, the drying secondary separator and a grading cyclone separator; the circulating fluidized bed air heating furnace is connected with the grading cyclone separator. In addition, the invention further discloses an application method of the system. The heat carrier destructive distillation system is low in investment and easy to implement, and has high overall efficiency and excellent safety.

Description

technical field [0001] The invention relates to the technical field of fully and rationally utilizing coal resources, in particular to a heat carrier dry distillation system for coal and a method thereof. Background technique [0002] There are many coal dry distillation (pyrolysis) upgrading processes, and the dry distillation process is an endothermic process, which can be divided into external heat type and internal heat type according to different heat supply methods. According to the difference of heat transfer medium, internal heat type can be divided into gas heat carrier method and solid heat carrier method. [0003] The gas heat carrier method uses high-temperature inert gas as the carbonization heat source. The ENCOAL process and CODE process in the United States are all gas heat carrier carbonization methods, but the disadvantage of this method is the dilution of the inert gas, which reduces the quality of the gas. At the same time, the raw coal The particle size...

AI Technical Summary

Problems solved by technology

The disadvantage of using ceramic balls is that additional fuel is required to heat them, and the overall thermal efficiency is low

The patents applied by Northeast Electric Power University (ZL200710055610.1, ZL201220606884.) use circulating fluidized bed hot blast furnace to circulate hot ash and burning embers as solid heat carriers. These two patents are more suitable for the pyrolysis of oil shale, but not for coal. Pyrolysis, when the methods provided by these two patents are used for pyrolysis of coal, high-quality semi-coke products cannot be obtained. The obtained semi-coke products are burnt coke residue or a mixture of semi-coke and ash, and its calorific value is low And it has no utilization value, and the energy consumption is high, and there are complete hidden dangers in the system

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