Device and method for regulating humidity of coal powder by utilizing microwave preheating

Abstract

The invention provides a device and method for regulating humidity of coal powder by utilizing microwave preheating. The device comprises coal storage tanks, a pulverizer, two buffer bins, a microwave box, a microwave device, an exhaust fan, a condenser, conveyer belts, a detection device and the like. Single coals enter the respective coal storage tanks via belt-type machines; an automatic coal blending device is arranged below each coal storage tank; the feed amount is controlled according to the given value, the coal is sequentially spread on a coal blending belt, enters the pulverizer to be pulverized, and enters the two buffer bins; and the coals enter the microwave box through the respective conveyer belts, so that the continuous coal feed is converted into intermittent coal feed. Microwaves generated by a microwave source in the microwave box are transmitted to the coking coal in the microwave box without any loss so as to form a uniformly-distributed microwave field and humidify the coking coal. A detection control device is utilized to keep the water content of the coking coal to be 6-7%, the coking coal is continuously sent into the coal tower by the belt-type machine, and the vapor generated in the humidifying process is discharged, condensed and sent to a water collection tank. The device has the advantages of high humidifying efficiency, favorable uniformity and energy saving, and can enhance the coke quality.

Description

technical field [0001] The invention relates to a novel coal preparation process for adjusting the humidity of coal powder by using microwave preheating, belongs to the technical field of energy saving, and is suitable for drying and humidity control of coal powder with relatively high humidity in industries such as metallurgy, electric power, and coal chemical industry. Background technique [0002] Coal is the main energy source in China. When coal is used in industry, it is generally washed first. The moisture content of the washed coal is still high, and further dehumidification and dehumidification are required to make effective use of coal. At present, the coking coal used by domestic and foreign coking enterprises in coking is directly loaded into the coke oven after being transported and blended from the coal yard to reach the proportion of coal types, resulting in a relatively high humidity of 10%-14% for the added coal. After the coal with high moisture content ent...

AI Technical Summary

Problems solved by technology

However, the process is complicated, the equipment is huge, the operation links are many, and the investment is high, so it is rarely used now.

The second type of pulverized coal drying and humidity control technology uses steam as the heat carrier. In the multi-tube rotary dryer, steam is used to indirectly heat the coal material, so that the coal material is dried and adjusted. However, this process uses steam as the heat carrier. carrier, wastes energy, and cannot meet the user's requirements for energy saving by using coke oven flue gas waste heat, and is rarely used at present

The above three processes are complicated, heavy equipment, high investment, large floor area, difficult operation and maintenance, high steam and power consumption, low operation rate, and poor adaptability to coal with high moisture and high viscosity, and need to be equipped with environmental protection and dust removal system

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