Hot water gas dehydration device for low rank bituminous coal

Abstract

The invention discloses a hot water gas dehydration device for low rank bituminous coal. The hot water gas dehydration device comprises a shell, a water vapor evaporative exhaust device, a waste gas heat exchange dehydrator and a lower coal cabin, wherein a coal drying cavity is formed in the shell; the top of the cavity is relatively enclosed, and is only provided with a coal inlet; the lower coal cabin is formed at the bottom of the shell, and is communicated with the cavity; the water vapor evaporative exhaust device comprises a water vapor exhaust hole, a water vapor hole communication pipeline, a water vapor collecting pipeline and a condensed water collecting pipeline; and the waste gas heat exchange dehydrator comprises a hot water gas entrance channel, a hot waste gas buffering chamber, a radiating pipe, a radiating pipe serial connection channel, a waste gas transition channel and a low-temperature waste gas exhaust channel. According to the principle of the hot water gas dehydration device for the low rank bituminous coal disclosed by the invention, hot waste gas produced after burning of clean gas produced during high-temperature pyrolysis of the low rank bituminous coal is dehydrated and dried without adding additional energy consumption, so that cost is saved, a good dehydration effect is achieved, and the water content of the dehydrated low rank bituminous coal can be controlled at about 5 percent.

Description

technical field [0001] The invention relates to a coal dehydration device, in particular to a device for dehydrating low-modified bituminous coal with high water content by using hot waste gas. 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 st...

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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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