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Knowledge On Regenerative Cement Rotary Kiln

Rotary kiln belongs to building material equipment, and it can be divided into cement kiln, metallurgy chemical kiln and lime kiln according to different materials.These typically consist of a pair of shafts, operated alternately.First, when shaft a is the "primary" and b the "secondary" shaft, the combustion air is added from the top of shaft a, while fuel somewhat below via burner lances.The flame is top-bottom.The hot gases pass downward, cross to shaft b via the so called "channel" and pass upward to exhaust of shaft b.At same time in both shafts cooling air is added from the bottom to cool the lime and to make exhaust of gases via the bottom of the kiln impossible via maintaining always a positive pressure.The combustion air and cooling air leave the kiln jointly via exhaust on top of shaft b, preheating the stone.The direction of flow is reversed periodically (typically 5-10 times per hour) shaft a and b changing the role of "primary" and "secondary" shaft.The kiln has three zones: preheating zone on the top, bunting zone in the middle, and cooling zone close to the buttom.The cycling produces a long burning zone of constant, relatively low temperature (around 950°c) that is ideal for the production of high quality soft burned reactive lime.With exhaust gas temperatures as low as 120c° and lime temperature at kiln outlet in 80c° range the heat loss of the regenerative kiln is minimal , fuel consumption is as low as 3,6 mj/kg.Due to these features the regenerative kilns are today mainstream technology under conditions of substantial fuel costs.Regenerative kilns are built with 150 to 800 t/day output, 300 to 450 being typical.Cement kiln is used for making of cement clinker and there are dry and wet methods to make cement.Metallurgy chemical kiln is used in metallurgy industry and ironworks for lean iron ore, chromium ore and ferronickel ore calcimine.Rotary kiln is used for calcimine of high aluminum vandal ochre in refractory material industry; for calcimine of calotte and aluminum hydroxide in aluminum manufacturer; for claiming of chrome sand ore and chrome powder ore in chemical plant.Lime kiln is used for baking active lime and dolomite in the steel factory and ferroalloy factory.Wet magnetic separator : http://www.Hxjq-crushers.Com/17.Htmcement plant : http://www.Hxjq-crushers.Com/5.Htmmineral impact crusher : http://www.Hxjq-crushers.Com/6.Htmball mill : http://www.Hxjq-crushers.Com/4.Htmrotary kiln : http://www.China-crusher.Com/rotary-kiln5.Html.

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