Brown coal drying and dehydrating device

Abstract

The invention relates to a brown coal drying and dehydrating device and an application method. The hot-air drying and dehydrating device dries and dehydrates brown coal at high speed and low energy consumption by main means of high-power microwaves and infrared. The application method for the device comprises the steps of: crushing raw coal; pretreating the coal through a hot-air drying system to remove external water; and then drying and dehydrating the coal further by microwaves, wherein an infrared scanning system is adopted in the drying and dehydrating process in order to prevent the brown coal from backwater. By applying the device, the water in the brown coal can be removed by over 98 percent in short time. The brown coal drying and dehydrating device has the advantages of simpleness and easy operation of process flow, quick dehydration and low energy consumption. The device and the method have no negative effect on the environment, the water coming out through drying can also be recycled, and the device and the method are economic and effective.

Description

Technical field: [0001] The invention belongs to the technical field of coal processing, in particular to the application technical field of processing and dehydrating lignite quickly and with low energy consumption. Background technique: [0002] my country is a country dominated by coal as a primary energy source, and has become the world's largest coal producer. According to statistics, my country's mineable reserves of coal resources rank third in the world, accounting for about 11.5% of the world's total reserves. Among them, lignite processing accounts for about 16% of the world's total lignite reserves. At present, bituminous coal and anthracite are the main mining and utilization of coal resources in our country, and the mining and utilization level of lignite is very low. With the continuous increase of my country's demand for energy and the excessive exploitation of bituminous coal and anthracite resources, the development and utilization of lignite will become m...

AI Technical Summary

Problems solved by technology

Although the patent US4567340A also mentioned a kind of electromagnetic wave lignite dehydration equipment, but the equipment has high operating cost, which is mainly manifested in high energy consumption

In addition, the microwave drying equipment for coal is also mentioned in the patent CN101326265A. First of all, this equipment is the same as the patent US4567340A. Grading and then drying treatment, which increases the process and increases the operating cost accordingly

We all know that electromagnetic waves are mainly driven by electricity, and the efficiency of electromagnetic waves from input power to output power is 75%, and 1KW output power will evaporate 1kg of water, so when lignite is completely dehydrated by electromagnetic waves, the cost is quite high and it is difficult mass production

The efficiency of microwave in removing internal water (adsorbed water) and combined water in lignite is very high, because water molecules are wave-absorbing substances, which increase their own energy by absorbing the energy of microwaves, thereby accelerating the rotation of water molecules Vibrates and emits into the air, which is difficult for conventional equipment

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