Gap Determination for Clinker Preparation Kilns
Journal Title: RECENT - Year 2009, Vol 10, Issue 26
Abstract
Cement kilns are the heart of the cement production process; they are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement. Their capacities usually define the capacity of the cement plant. The gaps between the kiln and the rings which support the kiln have to be constant. The gap has to be kept between two limits so that the force of friction is great enough to avoid uncontrolled sliding between the ring and the shell of the kiln. If these are not equal for all of the rings, they can twist the kiln. The measurement of the temperature of the shell and of the kiln, and the computing of the gap based on these two are difficult. The purpose of this work is to build up a measuring system for the gap, based on the measurement of the time of an entire rotation of the two entities using a programmable logic controller (PLC). The computing algorithm has been applied to determine the gap for the clinker kiln at the cement mill LAFARGE Hoghiz, Romania. The results obtained have been verified. Before the kiln was turned on, a line a line has been drawn starting on the ring and ending on the shell of the kiln. By measuring the distance between the two lines after the accomplishment of n rotations the gap has been determined manually. This gap was then compared with gap determined by the PLC and the two were nearly equal. The higher the number of rotations taken into account is, the greater the precision of the obtained gap will be. Because the gap is determined by a program, the result can then be sent to higher ranked system which can take a decision which will cause the growth or the decrease of the gap.
Authors and Affiliations
Ioan MĂRGINEANU, Lucian ITU
Keywords
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