News information
Side gap and side gap
08-07
Brick and tile roasting kilns flatten the stove, so there is also a tendency for the fire to concentrate in the middle of the stack. Its specific performance is: on the same section, the middle temperature is high, the temperature on both sides is low, the medium fire runs fast, the side fire lags behind, and the middle is easy to produce over-fire bricks, coke bricks, and both sides are easy to produce under-fire bricks and raw bricks. Especially in the tunnel kiln this situation is particularly serious, this is because in the tunnel kiln brick billet and kiln body have relative movement, one is the brick billet walk, the kiln does not move, one is the kiln body walk brick billet does not move, but are required to keep a certain distance between the billet stack and both sides of the kiln wall, kiln top, so as not to wipe hanging, pour billet. This distance is called"Side clearance" and "Top clearance". Its width should be 50mm ~ 80mm, not too wide, so as not to pass too much air volume, the tropical run away, the temperature can not rise, but also out of the fire brick, brick. The width of the seam between two adjacent bricks in the blank stack is only 15mm ~ 30mm, which is much smaller than the 50mm ~ 80mm of the side gap, the air volume that can pass through is also much less, and the heat taken away by the wind is much less, which further aggravates the tendency of fire to concentrate in the middle, resulting in serious high temperature in the middle and low temperature on both sides. For this reason, the temperature of the middle high temperature part should not be high when the blank is coded.
The method is to leave a width equal to or slightly greater than the sum of the side gaps on both sides in the middle of the kiln section."Middle seam", in this way, there is no brick blank, no internal coal burning, no heat source, plus the middle seam width passes through more wind, takes away more heat, and its temperature cannot rise even if it wants.
When the section of the kiln is wide, there are more than two stacks on the section, and two or three slits can be left outside the stacks on both sides of the middle slit........ The width decreases in turn until the gap on both sides is 50mm ~ 80mm. For this reason, the number of billets on a cross section must be even, and the number of drawing seams between billets is odd, and only then can there be a relatively wide middle seam to realize "medium thinning and edge density".
In the kiln room, there should be not only the above-mentioned longitudinal seam, but also the transverse seam. This is because the wind coming in longitudinally along the kiln chamber has to turn when it reaches the preheating zone and the drying zone.The bend of the 900, from the kiln wall, the mouth of the kiln top, the inlet of the air duct enters the flue and the tidal duct and is discharged to the atmosphere. If there is no transverse air duct, the flue gas and water vapor cannot be discharged smoothly, which will affect the fire speed in the light, and cause major accidents such as brick condensation, tidal collapse and kiln collapse.
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