Drying or low-temperature destructive distillation method and device of brown coal or low-deterioration long flame coal

Abstract

The present invention relates to a drying or low-temperature destructive distillation method and apparatus for brown coal or low-deterioration long flame coal. A tunnel type drying chamber of the method and apparatus comprises a preheating segment and a high-temperature segment, multiple exhaust ports are disposed on the top of the high-temperature segment, and multiple hot air or vapor inlets are disposed on the bottom or the side of the high-temperature segment. Multiple excessive tail gas inlets are disposed on the bottom or the side of the preheating segment, the preheating segment is in communication with the multiple exhaust ports of the high-temperature segment through an excessive tail gas exhaust pipeline of the high-temperature segment, and multiple tail gas and condensed water discharge openings are disposed on the bottom of the preheating segment. The tail gas exhausted by the high-temperature segment can be entirely or partially reheated by an external heat source generator or mixed with fresh hot air to form hot air and vapor with a necessary temperature, flow speed and flow rate to be used in drying or destructive distillation of a material, and part of the tail gas can enter the preheating segment to preheat the drying material and is exhausted after an environmental protection treatment. The method and apparatus are environmentally-friendly and easy to control, the heat of vaporization is recycled, the device is simple and the manufacturing cost is low, and mass production is easy to carry out.

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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