Rotary kiln can be used in mining industry

Rotary kiln is negative pressure operation, the negative pressure to ensure that the flame has a certain shape and length, so that can supply for pulverized coal combustion in oxygen, so as to achieve the purpose of the pulverized coal combustion. Only negative pressure operation, timely discharge waste gas produced by coal combustion and exhaust gas produced during the decomposition of CaCO3, make the production on the rails. Otherwise, the waste gas is not discharge in time or is bad to get rid of it, can’t normal production. Data shows that: in an airtight container, with the increase of CO2 content of CaCO3 decomposition, decomposition speed slow down, until it is zero. To strengthen the ventilation and exhaust each reduced by 2%, the content of CO2 in the decomposition time shortened about 10%, therefore, if you don’t negative pressure rotary kiln production and forced ventilation, pulverized coal not only can’t combustion, flame shape, CaCO3 difficult to decompose, and kiln head sealing equipment, smoke chamber walls, watching the fire cover, etc., will be burn out.

Pulverized coal is fine, fast burning completely; Granularity or less coarse coal, which is beneficial to the dryer complete combustion, coal particle size should be in the range of 0.05 ~ 0.07 mm. High volatile coal or the coal which coal quality pine, its size can be slightly larger; Anthracite coal or hard coal, grain size will be smaller. Pulverized coal fineness of hongxing control in 0.08 mm square hole sieve, the sieve residual is 5% ~ 5%; High content of volatile matter of high value, and vice in low. Under the premise of meeting the process requirement, the granularity of coal powder is fine and good for dryer burning, but the preparation of superfine pulverized coal to increase the power consumption of grinding superfine pulverized coal spontaneous combustion will lead to the dryer, even burst, not safe, so the preparation of pulverized coal particle size may not too fine.

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