Step-by-step quality-improving processing technique and processing system for low-level coal

Abstract

The invention provides a step-by-step quality-improving processing technique for low-level coal. The processing technique includes the following steps: (1) the step of drying: raw coal particles are fed into a drying reactor to carry out anoxic hot gas drying under normal pressure, and moisture in the raw coal particles is physically removed; (2) the step of low-temperature dry distillation (thermal decomposition): the dry coal particles which are processed by the step (1) are fed into the dry distillation (thermal decomposition) reactor, anoxic gas is filled under normal pressure to carry out heating and dry distilling, and volatile matters in raw coal overflow in gaseous state through chemical changing. The invention further provides a step-by-step quality-improving processing system for the low-level coal, which comprises the drying reactor and the dry distillation reactor. The dry distillation reactor is arranged at the lower part of the drying reactor. By adopting the step-by-step processing method of drying and low-temperature dry distilling, the invention overcomes the singleness of the domestic quality-improving technology for the low-level coal in the treatment of coal varieties, thereby realizing the diversity of the quality-improving coal varieties.

Description

technical field [0001] The invention relates to a quality upgrading treatment process of dry dehydration-low-temperature carbonization for low-rank coal, and also relates to a processing system for dry-dehydration-low-temperature carbonization of low-rank coal. Background technique [0002] Low-rank coal includes peat, lignite, long-flame coal, gas coal, weakly caking coal and other sub-bituminous coal, accounting for about 50% of the world's coal resource reserves. More than 60% of the reserves. Mainly distributed in Yunnan, Inner Mongolia, Northeast China, Sichuan and other provinces. It is characterized by high water content, generally accounting for more than 20% (received basis); high volatile content, about 30-50% (dry ash-free basis); low calorific value, 2500-4500 kcal / kg. [0003] At present, the mining and utilization of coal resources in my country are mainly anthracite and bituminous coal, and the mining and utilization level of low-rank coal is very low, mainl...

AI Technical Summary

Problems solved by technology

Chinese patent CN201053004Y discloses a process technology of dry distillation and upgrading of sub-bituminous coal and bituminous coal using a rotary furnace. Although this process has a large amount of coal to be processed, it can realize large-scale production, but its ability to process low-rank coal is not high and energy consumption is large. , and have high requirements for factory construction, occupy a large area, and complex equipment supporting systems

Chinese patent CN1966612A discloses a technology for dry distillation and upgrading of weakly cohesive coal using a gas-carrier internal heating vertical furnace. This process can only be used for the upgrading of bituminous coal with low water content, and the coal type requires high requirements. , it is difficult to achieve the diversification of coal types; and in order to ensure the heat transfer efficiency and gas circulation volume of this process, the amount of coal processed is not large, and it is difficult to realize the expanded production on an industrial scale

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