Belt-conveying drying system and method for realizing dehydration upgrading of lignite by using solar energy

Abstract

The invention relates to the field of coal high-efficiency utilization and aims to provide a belt-conveying drying system and a belt-conveying drying method for realizing the dehydration upgrading of lignite by using solar energy. The system comprises a feed preheating chamber, a dryer and a discharged material cooling chamber, which are connected in turn by a belt-conveying equipment, wherein the dryer is divided by a vertical partition into an air preheating chamber and a drying chamber, through holes are formed on the partition, and the air preheating chamber is provided with an air inlet, a drying chamber and an air outlet; and the discharged material cooling chamber is provided with a fresh air inlet, the air outlet of the discharged material cooling chamber is connected with the air inlet of the air preheating chamber by an air duct, the air outlet of the drying chamber is connected with the air inlet of the feed preheating chamber and the air inlet of the air preheating chamber by air ducts at the same time, and the air outlet of the feed preheating chamber is connected to a coal powder separation system. The system and the method have the advantages that: the energy-conservation and emission-reduction effect is obvious; the drying process is simple; the initial investment is small; the operation cost is low; the normal energy consumption is low; the pollutant emission is small; and the management and use of the whole device can be accepted by a user more easily.

Description

technical field [0001] The invention belongs to the field of high-efficiency utilization of coal, and in particular relates to a belt-type transfer drying system and method for realizing dehydration and upgrading of lignite by using solar energy. Background technique [0002] my country's lignite reserves are very rich, and the proven reserves are more than 100 billion tons, accounting for about 13% of the total coal reserves. With economic development and the decline of recoverable reserves of high-quality coal resources, it is of great significance to effectively utilize lignite. However, lignite is a mineral coal with the lowest degree of coalification, which has high moisture content (generally 25wt%-50wt%), low calorific value (generally 1500kcal / kg-3500kcal / kg), and poor long-distance transportation economy. These disadvantages of lignite increase the utilization cost of lignite, reduce its market competitiveness, and limit the efficient and large-scale use of lignite...

AI Technical Summary

Problems solved by technology

At present, there is no process and technology for dehydration and upgrading of lignite by using solar energy resources at home and abroad. The present invention makes full use of the characteristics that the areas rich in lignite resources in my country are also the areas with the most abundant solar energy resources, and fill the gap in the dehydration and upgrading of lignite by solar energy.

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