There is a problem for coke ovens No. 3 and 4 at the Radonkoks company (Makeev coke and chemistry plant, Ukraine) from the sliding of the lining under the middle loading hatches. Examination [1] confirms that there is extensive disruption of the lining under the middle loading hatch in an oven of height 5.5-7 m, which after 8-15 years of operation extends to 100 percent of the piers. A cause of premature failure is the use of coals whose coking produces high swelling pressure. The lining under the middle loading hatch shows unstable behavior also because it is not capable of sustaining the tensile stresses arising from vertical and horizontal bending stresses [2] caused by the unilateral excess pressure of the coal tars and gas medium on the heating wall. It has been found that when the lining is reinforced by loads acting at the ends of rods, the minimal compressive stresses arise in the middle part of the pier, i.e., under the middle loading hatch, and in the zone where there are the maximal tensile bending stresses. This causes the lining to slip. The stability is affected also by the design, the properties of the refractory, and so on.
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