Pulverizing the coal to a fine powder is an important function in the operation of a power plant. This article explains the different methods of pulverizing.
The key input
There are basically three different types of pulverizing.
1. Attrition Type
Coal feeds onto a steel rotating table. Tapered, cylindrical, or spherical rollers on top of the table, under spring pressure, exert force on the coal particles on the table. When the table rotates, the coal passes between the rollers and the table and gets ground due to attrition. The hot air under pressure carries this ground coal upwards. Larger particles fall back to the grinding table. These coal particles then pass through a classifier where the large particles get separated due to centrifugal action and are returned back to the grinding table. Different manufacturers use different type of rollers. "Bowl mills" or Raymond mills use tapered rollers. MPS mill use tire type rollers and are called new era chicago white sox black and white caps "roller mills." The "ball and race mills" use spherical rollers. The main characteristics are:
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2012年9月18日星期二
new era chicago white sox black and white caps
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