Considering that cement industry is more often and more serious confronted with crises of fossil fuels, therefore with the necessity of reducing specific heat consumptions, the use of alternative fuels may be an efficient solution.

Although in the past few years the research in this domain has increased, at present there is little information regarding how the use of alternative fuels may influence the values of the main thermo-technological indicators of combustion process and rotary kilns: temperature and enthalpy of hot gases, absolute productivity and specific heat consumption.

This paper aims to present some data regarding the influence of partial/total substitution of a reference fuel with an alternative one on specific heat consumption of rotary kilns.