Lignite drying/low-temperature carbonization method with function of conducting heat by steam

Abstract

The invention discloses a lignite drying / low-temperature carbonization method with a function of conducting heat by steam. The method comprises the steps of: after putting a material to be dried into more than two drying chambers which are sequentially communicated, and sealing, introducing steam into one drying chamber, stopping feeding the steam until the drying chamber is full of steam and with a required steam pressure, and starting a heating device in the drying chamber; and when the steam temperature raises to exceed the burning point of the material, prolonging the heating time to achieve the low-temperature carbonization of the material. Overpressure steam generated in the drying chamber in the material heating process is discharged into the next sealed drying chamber in which the martial to be heated is put, and so forth, the upstream drying chamber recycles the overpressure steam discharged by the previous drying chamber to preheat and dry as shown in step two; and the generated condensate water is drained from a condensate water drain outlet. The lignite subjected to drying / low-temperature carbonization is obviously reduced in moisture, greatly reduced in size, increased in particle strength, and low in production input cost, and is simultaneously suitable for the drying process of other materials.

Description

technical field [0001] The invention relates to material drying and low-temperature dry distillation technology, in particular to a drying / low-temperature dry distillation method and device thereof after lignite particles and pulverized coal are granulated. This drying and low-temperature dry distillation technology is also applicable to the drying processing of vegetables, fruits, wood and other materials. 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 improving coal quality. There are many kinds of methods used, but there is no mature technical process, and there are many disadvantages, mainly: ① The coal after drying is still completely The disadvantage of lignite is that it is prone to spontaneous combustion, weathering, and easy to absorb water and return to moisture. ② Due to the low ignition point of lignite during dry...

AI Technical Summary

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 improving coal quality. There are many kinds of methods used, but there is no mature technical process, and there are many disadvantages, mainly: ① The coal after drying is still completely Disadvantages of lignite, easy to spontaneous combustion, weathering, easy to absorb water and return to moisture

② Due to the low ignition point of lignite during dry drying, hot air drying is dangerous, easy to catch fire or even explode, and the degree of environmental pollution control is poor; wet (steam) drying uses fluidized bed drying, which consumes a large amount of steam and consumes Large capacity, high production cost, and expensive equipment

③Drying equipment is complex, difficult to large-scale production, high investment costs

④ It is difficult to recycle the latent heat of vaporization of moisture in the material during drying, resulting in high energy consumption and high production costs

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