Brown coal drying equipment and method

Abstract

The invention provides a lignite drying process and equipment used therein. The basic principle of the present invention is to use the concentration gradient to diffuse the water molecules covered on the raw coal surface into the air flow. The basic method is to blow air into the coal seam through a fan, and take away moisture while the air passes through the coal seam.

Description

field of invention [0001] The invention relates to drying technology, in particular to a lignite drying equipment and method. Background technique [0002] Lignite is the coal with the lowest degree of coalification and is named for its brown or dark brown appearance. The geological reserves of lignite in the world are about 4 trillion tons, accounting for 40% of the global coal reserves. my country is rich in lignite resources. According to statistics at the end of the 20th century, the country has proven reserves of lignite of 130 billion tons, accounting for about 13% of the country's total coal reserves. Among the proven lignite reserves in China, the northeastern region of Inner Mongolia has the largest amount, accounting for about 3 / 4 of the national lignite reserves; the southwestern region, mainly in Yunnan Province, accounts for about 1 / 5 of the country's lignite reserves; Lignite in Northeast China, East China and South Central China accounts for about 5% of the ...

AI Technical Summary

Problems solved by technology

The system of this method is relatively complicated, and the manufacture of the steam compressor (heat pump) involved is relatively difficult, and there is no application precedent in China.

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