A lignite drying device and method

Abstract

The invention relates to a lignite drying device and method. The device includes a steam device and a turntable conveying device; the steam device is composed of a column and a steam riser, and the steam riser is divided into three connected steam pipes, the upper, the middle and the lower. The steam pipe in the lower section is connected with the steam inlet, and the steam pipe in the upper section is connected with the steam outlet, forming a C-shaped steam flow channel; there are intervals between the steam pipes in each section as drying stations; 2 sets of lignite steamers, each set of lignite steamers are composed of 3 steamers, and each steamer reaches the drying station in sequence after being rotated by a turntable. In the present invention, drying lignite in a steamer is equivalent to a fixed bed drying method, and each group of 3 steamers can simultaneously complete the process of coal loading, drying, and coal unloading at 3 different stations, and has a good effect of lignite drying and quality improvement, and the device With the advantages of simple structure, small footprint, and continuous and efficient operation, it is especially suitable for medium and small-scale lignite drying operations.

Description

technical field [0001] The invention relates to the technical field of lignite drying and upgrading, in particular to a lignite drying device and method. Background technique [0002] Among the lignite reserves in my country, Yunnan and Inner Mongolia are the most, accounting for about 3 / 4 of the national lignite reserves, but the formation time of lignite underground is relatively short, and the degree of coalification is relatively low. Its main feature is relatively high water content , accounting for about 30% to 50% of the weight of lignite. Due to the short formation time, there are many capillary pores inside lignite, which makes lignite like a sponge, which will absorb moisture when it meets water after drying, and if this kind of lignite with high water content is directly transported, the price is expensive and the cost performance is low , thus limiting the possibility of transporting lignite to remote areas. The direct participation of high-moisture lignite in c...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the conventional lignite drying methods adopt fluidized bed or rotary drying, and most of them use indirect heating, which generally has the following disadvantages: 1) It can only remove the moisture on the surface of lignite, but cannot effectively remove many of the lignite. The internal water in the capillary, so the dried lignite is easy to absorb water and return to moisture or weather and spontaneously ignite; 2) When dry drying is used, due to the low ignition point of lignite, there is a risk of burning or even explosion; when using fluidized bed wet drying, steam Large consumption, high energy consumption, high production cost, and high equipment cost; 3) The structure of the drying equipment is complex, the floor area is large, and the investment cost is high

[0004] The Chinese patent with the patent number CN 204154090 U discloses a "lignite drying device", which consists of a raw coal conveying system, a steam heat source system, a drying system, and a wet electrostatic precipitator system. large area

[0005] The Chinese patent with the patent number CN102564095 discloses "a device and method for drying lignite with low-pressure superheated steam", which uses the steam to move from bottom to top and the lignite to move from top to bottom for drying. The process is complicated and the process conditions are strict.

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