Efficient drying and quality-improving device and method for brown coal

Abstract

The invention relates to an efficient drying and quality-improving device and method for brown coal. In the prior art, no efficient drying and quality-improving device or method for brown coal, which is used for improving the utilization value of the brown coal, exists. The efficient drying and quality-improving device is characterized by comprising a coal storage bin, a fuel bin, a hot blast stove, a cylinder-type dryer, a product bin, a cyclone dust collector, an electrical dust collector and a plurality of pipelines, wherein both the product bin and the coal storage bin are connected with the cylinder-type dryer; the cylinder-type dryer is connected with the cyclone dust collector; and the cyclone dust collector, the electrical dust collector, the fuel bin are all connected with the hot blast stove. The method is characterized in that the raw material of the brown coal is conveyed into the cylinder-type dryer from the coal storage bin; the hot blast stove generates high-temperature flue gas at the temperature of 700-900 DEG C, and the flue gas is conveyed into the cylinder-type dryer; the raw material of the brown coal is dried by the high-temperature flue gas and conveyed into the product bin from the cylinder-type dryer for sealing and cooling, so that the finished product of the brown coal is obtained after cooling. According to the device and the method, the moisture in the brown coal can be reduced substantially, and a part of ash content in the brown coal can also be reduced, so that the utilization value of the brown coal can be improved.

Description

technical field [0001] The invention relates to a lignite high-efficiency drying and upgrading device and method, which are used for drying and dehydrating the lignite and removing part of the ash, so as to improve the grade of the lignite. Background technique [0002] my country has abundant coal resources, among which lignite reserves account for about 15% of the total coal reserves. However, due to the high water content of lignite and the presence of gangue and sand during the coal formation process, the calorific value of lignite is low, which brings certain difficulties to industrial applications. [0003] Lignite has the following typical characteristics. [0004] (1) Low calorific value. The calorific value of lignite is generally around 3000 kcal, which is much lower than the standard of 4600 kcal for low-quality coal stipulated in industrial applications. It can be seen that in order to increase the industrial utilization value of lignite, its calorific value mu...

AI Technical Summary

Problems solved by technology

[0005] (2) High water content

Generally, the water content of lignite is more than 30%. The high water content of lignite not only increases unnecessary transportation costs during transportation, but also reduces the original temperature in the furnace when lignite is used as power coal.

[0006] (3) developed pores and low density

Lignite has well-developed pores, is easy to weather and spontaneously combust, which is not conducive to storage

[0007] (4) High volatile content

[0010] In addition, the publication date is February 15, 2012, and the publication number is CN102352272A in the Chinese patent, which discloses a lignite upgrading device, which adds a heat extractor between the drying chamber and the regulating chamber to effectively control The total heat of the drying chamber, but the overall structure design is not reasonable enough, and the effect of upgrading the quality of lignite is poor

[0011] To sum up, at present, there is no lignite efficient drying and upgrading method with simple structure and reasonable design, which can greatly reduce the moisture in lignite, reduce part of the ash content in lignite, reduce the porosity of lignite, and improve the utilization value of lignite. Apparatus and method

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