Steam coal separation process

Abstract

The invention discloses a steam coal separation process. The steam coal separation process comprises the steps that raw coal is subjected to dry method deep classification through a double-layer elastic classifying screen, first-layer plus sieve materials of the double-layer elastic classifying screen enter a crusher, the first-layer plus sieve materials after crushing and second-layer plus sieve materials of the double-layer elastic classifying screen enter a desliming screen together to be subjected to dry desliming, and minus sieve materials of the double-layer elastic classifying screen and minus sieve materials of the desliming screen serve as slack coal products; plus sieve materials of the desliming screen enter a gravity separator for separation, light products and heavy products after separation are subjected to medium removal and dehydration, then clean coal and gangue products are obtained, minus sieve materials after medium removal and dehydration enter a slime water treatment system to be treated, and washing water closed cycle of the system is realized. The steam coal separation process is simple, production is steady and efficient, the steam coal separation has the advantages that the preparation proportion is high, the feed size range is wide, separation precision and adaptability are high, production cost is low and the like, and good economical and practical benefits are achieved.

Description

technical field [0001] The invention relates to a thermal coal separation process, which belongs to the field of coal screening and separation systems and processes. Background technique [0002] Coal is the main primary energy source in my country, and its reserves are abundant, reaching 5.9 trillion tons. It is the most economical, reliable and basic guarantee for my country's energy security and energy strategy. In 2015, the national raw coal output was 3.75 billion tons, and coal consumption accounted for 64.0% of the total energy consumption. Coal occupies a dominant position in my country's energy consumption structure, and coal has made a significant contribution to the development of my country's national economy. At present, the degree of clean utilization of coal in the country is relatively low. The selected proportion of raw coal is about 59%, and the proportion of steam coal is only about 35%, while that of developed countries in the world is 80% to 100%. Due t...

AI Technical Summary

Problems solved by technology

At present, thermal coal preparation plants mostly use raw coal for 13(6) classification, +13mm lump coal is sorted and discharged by moving screen jigging or dense medium separator, and the final coal is not selected. The final coal of this process is not sorted. The ratio of raw coal selection is low, the yield of clean coal is low, and the economic benefits of coal preparation plants are poor; in order to meet the user's requirements for coal product quality, it is necessary to increase the ratio of raw coal selection and increase the amount of final coal selection

However, the final coal is all selected, and the coal slime brought in during the sorting process needs to be recovered through dehydration. The dehydration effect of the coal slime is poor, the moisture content of the coal slime is high, and the calorific value is low. In some coal preparation plants, the calorific value of the sorted product coal is even lower than raw coal phenomenon

In addition, when the coal slime is easy to be slimed, too much coal slime enters the sorting system, it is difficult to settle the coal slime, and it is difficult to remove the water, which makes the slime content in the circulating water too high, which affects the sorting operation and affects the coal preparation plant. The production process system is running normally

Images