In the process of cement production, chlorides in combination with the SO3 also introduced into the process are a cause of breakdowns in the production process. Heat exchanger installations with and without calciner are particularly affected by this. Because of the high temperatures in the rotary kiln, the chlorides vaporise, only to condense again in the heat exchanger connected downstream. They thus form a loop which leads to concentration in the kiln/heat exchanger system. This particularly applies for chlorides, whose vaporisation rates in the rotary kiln are greater than 96%. Until a few years ago, the raw materials were the main source of the chloride input. The rising costs in the cement industry led to the use of substitute fuels by all producers, which on the one hand reduce the fuel costs, but on the other hand impair continuous operation or render it impossible by worsening the combustion situation in the kiln and increasing the input of chlorides. For this reason, bypass systems have been increasingly installed in recent times. This paper describes three plants only recently brought on stream by LAFARGE.
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