Process and equipment for improving the quality of coal slurry and lignite through drying same

Abstract

The invention relates to process and equipment for improving the quality of coal slurry and lignite through drying the same. The process comprises the following steps: (1) the coal slurry and the lignite are predried and then quantitatively fed to a drying system; (2) the coal slurry and the lignite are dried to be improved in quality by a material drying system; and (3) products are produced from the dried coal slurry and lignite of improved quality. The coal slurry and the lignite are dried and dewatered according to the physical and chemical properties of the same and the coal slurry and the lignite can not adhered to the wall of a cylinder of the equipment and can be cleaned automatically; the equipment is arranged integrally lineally on a plane so that the height of a factory building is lowered and the investment on the equipment is reduced by half compared with investment on the equipment arranged in a laminated mode; in addition, the equipment integrates feeing equipment, drying equipment and discharging equipment, has good sealing performance and high thermal efficiency which is increased to over 70 percent from the original 30-40 percent, saves energy to be consumed by one third, is environmentally friendly, can efficiently dewater the coal slurry and the lignite to improve the quality thereof and can be used safely and reliably so as to obtain obvious economic benefits.

Description

Technical field: [0001] The invention relates to a process and equipment for improving the quality of coal slime and lignite through drying, in particular to a process and equipment for drying and improving the quality of coal slime and lignite. Background technique: [0002] According to statistics, coal slime, a by-product of coal washing and processing in China, is about 30 million tons per year. Its ash content is mostly between 30% and 60%, which are discarded in tailings dams abroad. In China, most of them are left alone and flooded. This part of coal slime has a fine particle size (≤0.5mm), a high water content of about 30%, and a high viscosity, which not only brings great difficulties to storage, loading, and transportation, but also cannot be used in the national economy and people's livelihood, which is a great waste of resources. In order to remove moisture, most of them use air-dried ground pins; not only does it occupy a large area. Moreover, "coal slime wat...

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Problems solved by technology

[0004] At present, it is very difficult to dehydrate and improve the quality of the above two materials, and mechanical dehydration cannot be effective; only (thermal) drying and dehydration can be used. Most of the drying processes at home and abroad are aging and the equipment is outdated. The material devices are all separated from each other, so the equipment layout is cascaded, requiring tall workshops and large investment in equipment; when drying coal slime, sticking, blocking, and shed phenomena often occur, it is difficult to clean, the equipment cannot operate normally, and the dehydration and drying can reach The expected effect is not achieved; and because lignite is flammable and explosive, it is impossible to use direct "mass heat exchange" method for drying and dehydration. When drying lignite, indirect heat transfer is often used, and the thermal efficiency is low, generally around 30%, and the energy consumption is large. Realize energy saving and environmental protection

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