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The Importance Of Coal Washing

Mar. 04, 2021

The Importance Of Coal Washing

Coal washing is actually an important step in coal preparation. When washing the coal, non-coal materials and unnecessary raw materials are washed from the original ore. Through the coal washing plant, qualified products will be reached.

Why is coal washed(the importance of coal washing)?

The raw coal is mixed with many impurities during the mining process, and the quality of the coal is also different. The internal ash content of the coal is small, but the internal ash content is large. The products produced after coal washing process are generally divided into meteorites, medium coal, grade B clean coal, and grade A clean coal.

By washing coal, the cost of coal transportation can be reduced and the utilization rate of coal can be improved. Clean coal is an energy source generally used as fuel, and the fine coal in bituminous coal is generally used for coking.

The main reasons for coal washing are as follows:

1. Improve coal quality and reduce coal pollutant emissions

Coal washing can remove 50% to 80% of ash and 30% to 40% of total sulfur (or 60% to 80% of inorganic sulfur) in coal. Burning coal can effectively reduce soot, SO2 and NOx.

Emissions, washing 100 million tons of thermal coal can generally reduce 600,000 to 700,000 tSO2 and remove 16Mt of meteorites.

2. Improve coal utilization efficiency and save energy

The improvement of coal quality will significantly increase the efficiency of coal utilization.

Studies have shown that: coking coal ash content is reduced by 1%, iron-making coke consumption is reduced by 2.66%, and iron-making blast furnace utilization rate is increased by 3.99%; the use of washed anthracite to produce ammonia can save 20%;

For every 1% increase in coal ash used for power generation, the calorific value will decrease by 200~360J/g, and the standard coal consumption per kWh will increase by 2~5g; when industrial boilers and kilns burn coal, the thermal efficiency can be increased by 3%~8%.

3. Optimize product structure and improve product competitiveness

The development of coal washing is conducive to the transformation of coal products from a single structure, low quality to multiple varieties and high quality, and to achieve high-quality products.

There are many coal consumers in my country, and the requirements for coal quality and variety are constantly increasing. In some cities, the sulfur content of coal is below 0.5% and the ash content is below 10%.

If coal is not developed, it will not be able to meet market demand.

4. Reduce production waste

Because the coal-producing area is far away from the economically developed and rich coal resource areas, the coal transportation volume is large and the transportation distance is long.

The average transportation distance of coal is about 600 kilometers. After washing, the coal can remove a large amount of impurities and wash 100Mt raw coal, can save 9600Mt-km capacity.

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