The present work outlines the main results of a full-scale study conducted on the utilization of waste tires as auxiliary fuel in cement production. Experimental tests were conducted for determining the influence of shredded tires on combustion conditions, emissions produced, and the characteristics of clinker obtained, for feeding ratios over 35% in terms of total heat input. The addition of tire chips did not lead to any appreciable modification in either the whole process or the quality of clinker produced; gaseous emissions were mostly unaffected, with significant improvements related to the reductions obtained in nitrogen and sulfur oxides concentrations. Experimental findings from tests conducted with tire chips exposed to kiln combustion flue gases compare favorably with the typical burnout times derived from theoretical approaches. These experimental data and calculations to estimate particle trajectories beyond the injection point, through proper theoretical analysis of the kinetic behavior, result in important indications for the shredding operation and for optimum injection modes.

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One of the main aim of gas turbine engine designers is to improve the performances of their power\ud systems, as power attainable or thrust, without increasing fuel consumption too much. To achieve this\ud goal different practices are used, but two of the most effective ones are regeneration and intercooling.\ud The first consists in recovering part of the enthalpy present in exhaust gas to pre heat air before its\ud introduction into the combustion chamber, the second in cooling the air during the compression process\ud so as to reduce the compression work needed, and consequently to obtain more power available at the\ud output shaft. In this paper the behaviour of a turboprop engine has been simulated, by means of a\ud numeric computational program, in which both practices are adopted, studying their effects on the\ud performances, efficiencies and fuel consumption of the engine for different operating conditions

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