A lignite boiling dehydration device and method

Abstract

The invention relates to a lignite boiling dehydration device and method. The device comprises a sandwich pot, a water delivery pipe, a stirring device, a tilting device and a pulley device; Connected, the hollow trunnions on both sides are respectively used as steam inlet and steam outlet to communicate with the superheated steam pipeline; a stirring device is installed in the sandwich pot, and the stirring device is driven up and down by a pulley device; the water outlet of the input water pipe is set above the sandwich pot, and the water delivery A water control valve is set on the pipeline; the sandwich pot is erected on the tilting device and can be driven by it to tilt around the hollow trunnion, so as to dump out the lignite and water in the sandwich pot. According to the characteristics of high internal moisture and different amounts of humus in the lignite, the present invention dehydrates the lignite by boiling water, which can fully remove the moisture inside the capillary and destroy part of the capillary structure of the lignite. It has simple technology and equipment, and is fire-resistant , Explosion-proof, no dust discharge and so on.

Description

technical field [0001] The invention relates to the technical field of lignite drying and upgrading, in particular to a lignite boiling dehydration device and method. Background technique [0002] Lignite is a kind of mineral coal with the lowest degree of coalification. It has a high moisture content (15%-60%), is easily weathered and fragmented in the air, is difficult to store and transport, and has a low combustion value, only 3000 kcal or below. At the same time, lignite is rich in capillaries, and the capillaries contain rich water. [0003] At present, the main method to upgrade the quality of lignite is to dehydrate and dry it. The dried lignite is not only easy to transport but also has a large combustion value (up to 4800-6000 kcal). Existing lignite drying technologies can be specifically divided into the following three categories: mechanical dehydration process, evaporative drying process and non-evaporative drying process. However, the dehydration effect of m...

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Problems solved by technology

However, the dehydration effect of mechanical dehydration process and non-evaporative drying process is poor, and local overheating is easy to cause lignite spontaneous combustion and explosion accidents; evaporative drying process is relatively better in improving quality, but most of them adopt fluidized bed method, Ubiquitous following shortcoming: 1) can only remove the moisture of lignite surface, can not effectively remove the internal water in numerous capillaries in lignite, so the lignite after drying is easy to absorb water and regain moisture or weathering, spontaneous combustion; 2) steam consumption is big, consumes Large capacity, high production cost, and high equipment cost; 3) The drying equipment has a complex structure, a large floor area, and high investment costs

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