Types of coal mines different methods

The size of the machines continues to grow. Although some operators of process plants have introduced larger screens, others are hesitant to get involved. New US facilities are built in a single line, and larger screens are probably the easiest way to improve performance on this type of system. Larger machines not only reduce the capacity, but also the detection area within the system. A big screen instead of several small screens.

The carbon vibrating screen fulfills several functions in the modern processing plant. First, the separation according to size, but also drains and eliminates impurities. In the United States, the coal industry differs from region to region and therefore proof is required. The hardness of the coal can not only be a problem, but also other conditions, such as rock, clay and acidic water that affect the sieve.

The vibrating screen and the general selection of different classifications that use circular vibrations so that screen changes in the raw steel create the wrong phenomenon that increases the likelihood of screen paper can use larger meshes, more productive. Because circular agitator uniaxial excitation, so the simplest construction, noise and vibration of small maintenance-friendly, durable. The shaker is specially designed for quarrying quarries, but also for coal mining, coal processing, mineral processing, building materials, electricity and chemical industries, etc.

The coal is first crushed by the coal preparation machines to a size of 20 to 25 mm and then transported to the coal bunkers. The coal feeds feed this mill continuously and continuously if required. The coal is gradually crushed by grinding elements. The carbon particles are recycled about 4 times before the desired fineness is achieved. The finisher allows the finest particles to exit the mill outlet while the coarse particles are returned to the mill to continue grinding. The primary air comes from P. A. Blower through air preheater to coal mill or in some boilers. P. A. The blower pressurizes the heat received from the air preheater and passes it on to the mills. The warm primary air extracts moisture from the coal and serves as a conveyor to direct the coal dust through the pipes to the boiler.

The production is coal dust, which requires sophistication. For complete combustion, the carbon must have a fineness between 75% and 200 mesh and between 99.5% and 50 mesh. The mixture of primary air and carbon circulating in each carbon tube must have a minimum velocity of 18 m / s. Temp. About 80 ° C and an air / carbon ratio of 1.8-2. The fuel flow in the pipes is balanced in the range of +/- 10%.

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