Comprehensive utilization method of low metamorphic bituminous coal

Abstract

The invention discloses a comprehensive utilization method of low metamorphic bituminous coal. The comprehensive utilization method comprises steps of (1) coaling; (2) preheating hot exhaust gas; (3) conducting high-temperature pyrolysis and carbonization; (4) modifying smokeless coal after pyrolysis; (5) conducting dry quenching on modified smokeless coal to generate high-temperature combustible hot exhaust gas; (6) discharging smokeless coal after dry quenching; (7) leading out raw coke oven gas produced by pyrolysis in the step (3), purifying and burning; (8) conducting dry quenching on the smokeless coal by exhaust gas after burning, namely the step (5); (9) modifying the smokeless coal by the high-temperature combustible hot exhaust gas produced by dry quenching, namely the step (4); (10) preheating hot exhaust gas for gas supplement and burning of the high-temperature combustible hot exhaust gas, namely the step (2); (11) dewatering the low metamorphic bituminous coal with big moisture content by preheated hot exhaust gas; (12) discharging moisture; (13) sending the low metamorphic bituminous coal after dewatering to the step (1); and (14) supplementing new low metamorphic bituminous coal with big moisture content.

Description

technical field [0001] The invention relates to a comprehensive utilization method of coal, in particular to a comprehensive utilization method of low metamorphic bituminous coal. Background technique [0002] Studies have shown that the Jurassic coal reserves are the largest in my country from the perspective of formation age, accounting for about 45% of my country's proven coal reserves. Since the coal formed in this era except for a very small amount of anthracite, most of the rest are lignite , long-flame coal, non-caking coal, weakly caking coal and other low-metamorphic bituminous coals. The physical characteristics of low-metamorphic bituminous coals are high water content and high volatile components, especially lignite, which is a kind of brown-black between peat and bituminous coal. Dull low-grade coal has a water content of over 40% and contains free humic acid. It has strong chemical reactivity and is easily weathered in the air. It is difficult to store and transp...

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Problems solved by technology

[0003] However, low-modified bituminous coal and lignite are widely used in coking, oil refining, gasification, liquefaction, power and chemical industry. Dehydration and drying of low-modified bituminous coal and lignite, followed by low-temperature pyrolysis and dry distillation method, because dehydration and drying of metamorphic bituminous coal and lignite consumes a lot of energy, the production cost is high, and the coal chemical by-products obtained by low-temperature pyrolysis and dry distillation such as raw coal gas and tar It is also relatively low. At this stage, people are gradually studying the high-temperature pyrolysis process of low-metamorphic bituminous coal and lignite

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