Drying or low-temperature dry distillation method and device of brown coal or low-metamorphic candle coal

Abstract

The invention discloses a drying method or a low-temperature dry distillation method and device of brown coal or low-metamorphic candle coal. According to the method and the device, a plurality of tail gas discharging holes are formed at the top of a tunnel-type drying room; more than one condensate water discharging outlet is formed at the bottom of the tunnel-type drying room; the feeding end part of the tunnel-type drying room is a low-temperature segment; the discharging end part of the tunnel-type drying room is a high-temperature segment; a hot air inlet or a steam inlet is formed on the high-temperature segment; a charging car which moves from the feeding end part to the discharging end part is movably arranged in the tunnel-type drying room; and a plurality of metal material pipes provided with venting holes are mounted on the charging car at intervals. A heat exchanger communicated with the tail gas discharging holes and the hot air inlet or the steam inlet is also arranged on the device. The moving direction of the charging car is opposite to the leading-in direction of the hot air or the steam, so that the temperature of materials in the metal material pipes can be increased gradually; and thus the materials are dried or distilled. The water content of the materials after being dried or distilled is decreased obviously; and the majority of the water evaporated from the materials can be discharged as the condensate water. Therefore, the method is environment-friendly and easy to control, and realizes the recycling of the vaporization heating part. The equipment is simple, low in cost and easy for mass production.

Description

technical field [0001] The invention relates to the field of coal drying, in particular to the field of drying or low-temperature dry distillation of lignite and low-modified long-flame coal. Background technique [0002] Over the years, a large number of researches and experiments have been done at home and abroad on the technical process of reducing the moisture content of lignite and low-metamorphic long-flame coal and improving coal quality. There are many kinds of methods used, but there are no mature technical processes, and there are many disadvantages, mainly including: ①. The coal after drying still has the disadvantages of lignite, which is easy to spontaneous combustion, weathering, and easy to absorb water and return to moisture. ②. Due to the low ignition point of lignite in dry drying, the hot air is in direct contact with the coal during drying, which is very dangerous, easy to catch fire or even explode; the exhaust gas is entrained with coal powder, and the ...

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Problems solved by technology

[0002] Over the years, a large number of researches and experiments have been done at home and abroad on the technical process of reducing the moisture content of lignite and low-metamorphic long-flame coal and improving coal quality. There are many kinds of methods used, but there are no mature technical processes, and there are many disadvantages, mainly including: ①. After drying, the coal still has the disadvantages of lignite, which is easy to spontaneous combustion, weathering, and easy to absorb water and return to moisture

②. Due to the low ignition point of lignite in dry drying, the hot air is in direct contact with the coal during drying, which is very dangerous, easy to catch fire or even explode; the exhaust gas is entrained with coal powder, and the degree of environmental pollution control is poor; when wet (steam) drying, The amount of steam is large, the energy consumption is large, the production cost is high, and the equipment is expensive

③. The drying equipment is complex, difficult to large-scale production, high investment cost, high production cost

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