Coal pyrolysis solid heat carrier rotary heating method

Abstract

The invention relates to a coal pyrolysis solid heat carrier rotary heating method. According to the method, semicoke obtained through pyrolysis and having a temperature of 500-600 DEG C is conveyed into the furnace head of a rotary heating furnace through a feeder, and the heating furnace is installed in a certain inclination; the semicoke advances to the material outlet under the effects of gravity and a shoveling plate during a rotary furnace rotating process so as to be discharged; during the heating process, a certain amount of air or oxygen is introduced into the heating furnace, the air or oxygen and the semicoke having a temperature of 500-600 DEG C are subjected to partial oxidation reaction in the heating furnace, and a lot of heat is released so as to be used for heating the remaining semicoke to a temperature of 800 DEG C; and the 800 DEG C CO being subjected to heat exchange, N2 and other trace gases carry a small amount of the semicoke dust and are discharged from the furnace head or furnace tail so as to be burned, the burned flue gas is subjected to temperature mixing, and the obtained gas is conveyed to a rotary dryer so as to be used as the flue gas for drying. According to the present invention, only a small amount of the oxygen or air is introduced without introduction of a large number of high-temperature flue gas, the diameter and the length of the rotary heating can be effectively reduced, the equipment investment can be saved, and the enlargement difficulty of the equipment is reduced; the produced carbon monoxide tail gas is subjected to further burning and temperature mixing so as to be used for drying the raw coal, such that the heat resource for drying the raw coal is saved; and the dried coal is subjected to pyrolysis so as to improve the quality of the coal gas produced through the pyrolysis.

Description

technical field [0001] The invention relates to the technical field of fully and rationally utilizing coal resources, in particular to a coal pyrolysis solid heat carrier rotary heating method using hot semi-coke as a solid heat carrier. Background technique [0002] Developing comprehensive utilization industries of coal drying, pyrolysis, upgrading and processing can effectively alleviate the tight supply of high-quality steam coal, widen the resource channels of high-quality steam coal with low-grade coal, extend the industrial chain of the coal industry, and improve the comprehensiveness of coal resources. Utilization efficiency and environmental benefits of coal utilization can better meet domestic energy demand and provide a strong security guarantee for national economic development. [0003] There are many coal pyrolysis upgrading processes. The pyrolysis process is an endothermic process. According to the different heating methods, it can be divided into external he...

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Problems solved by technology

[0005] (1) The temperature of the high-temperature flue gas used for heating is 1100°C. It is necessary to heat the hot semi-coke at 600°C to 800°C. Due to the low specific heat of flue gas, the required amount of flue gas is large, resulting in a large volume of rotary semi-coke heating furnace equipment , it is difficult to enlarge the device

[0006] (2) The discharge temperature of high-temperature flue gas is 750-800°C, and the heat utilization rate of flue gas is low, resulting in energy waste

[0007] (3) The gas-solid heat exchange is carried out in the furnace body. To improve the heat exchange efficiency, the semi-coke needs to be picked up, which leads to a large breakage rate of the semi-coke, so that the amount of semi-coke dust brought out of the rotary heating furnace is large and increases. The load of subsequent incineration and dust removal processes

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