Introduction to Rotary Cement Dry Kilns

Dry approach kilns

In a contemporary works, the blended raw material enters the kiln by way of the pre-heater tower. Right here, hot gases from the kiln, and almost certainly the cooled clinker in the far end with the kiln, are made use of to heat the raw meal. Because of this, the raw meal is already hot prior to it enters the kiln.

The dry approach is significantly far more thermally efficient than the wet process. Firstly, and most undoubtedly, this is because the meal is actually a dry powder and there is certainly small or no water that has to be evaporated. Secondly, and much less undoubtedly, the approach of transferring heat is significantly a lot more efficient in a dry procedure kiln.

An integral part in the process is really a heat exchanger named a ‘suspension preheater’. This is a tower having a series of cyclones in which fast-moving hot gases maintain the meal powder suspended in air. All the time, the meal gets hotter as well as the gas gets cooler until the meal is at practically the same temperature as the gas.

The basic dry method technique consists in the kiln and a suspension preheater. The raw supplies, limestone and shale as an example, are ground finely and blended to produce the raw meal. The raw meal is fed in at the top of the preheater tower and passes through the series of cyclones within the tower. Hot gas from the kiln and, generally, hot air from the clinker cooler are blown via the cyclones. Heat is transferred effectively from the hot gases towards the raw meal.

The heating procedure is effective since the meal particles have an extremely high surface region in relation to their size and as a result of the significant difference in temperature among the hot gas and also the cooler meal. Ordinarily, 30%-40% in the meal is decarbonated before entering the kiln.

A development of this method is the ‘precalciner’ kiln. Most new cement plant is of this kind. The principle is comparable to that of the dry approach preheater system but using the significant addition of a different burner, or precalciner. Using the additional heat, about 85%-95% with the meal is decarbonated prior to it enters the kiln.

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