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Knowledge About the Shape of Rotary Kiln

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<p>The rotary kiln consists of a tube made from steel plate,and lined with firebrick. The tube slopes slightly (1–4°) and slowly rotates on its axis at between 30 and 250 revolutions per hour. Rawmix is fed in at the upper end, and the rotation of the kiln causes it gradually to move downhill to the other end of the kiln.At the other end fuel, in the form of gas, oil, or pulverized solid fuel, is blown in through the "burner pipe", producing a large concentric flame in the lower part of the kiln tube. </p><p>Early rotary kilns were simple cylinders. However, the idea that different parts of the kiln ought to have different diameters emerged quite early. Before 1900 in the USA, kilns were being installed with the front (hot) half having a shell diameter 20-30% greater than the rear half. A wider burning zone with a reduction in its diameter at the outlet end was favoured because this was considered to produced a zone in which the material bed depth was increased, thereby slowing material flow down, and allowing clinker to "soak" at the peak temperature. A further, more practical reason for a wide burning zone shell was that it allowed room for thicker refractory and for thick coating that usually forms in this zone.</p><p>The provision of expanded zones in other parts of the kiln enjoyed periods of popularity at various times. Expanded mid ("calcining") zones were advocated in the 1920s, while various forms of expanded rear (cold end) zones had a long and continuing popularity, these becoming more standard as it became known that most "long" kilns are limited in their capacity by the gas velocity at the back end. At the same time, there has always been a strong body of opinion in favour of "straight" kilns, it being argued that the benefits of expanded sections are outweighed by their disadvantages - the tapered sections are mechanically weak and hard to line with stable brickwork.</p>The products produced by Fote Machinery Co., Ltd. are <a href="http://www.fut-china.com/p-17.html">fertilizer machine manufacturer</a>, <a href="http://www.ft-dryer.com/products/Metal-powder-dryer.html">metal powder dryer</a> and so on, and Fote Machinery will satisfy you with best products and top service. Thank you for your reading!<p>shaking table separation: http://www.fote-machine.com/product/sha … </p>

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