Experimental study of gasification of automobile tires in filtration combustion with different heat carriers

Experiments on the filtration combustion of automobile tires mixed with a solid coolant are carried out. The mass content of tire particles in a mixture varies from $10$ to $70\%$. Particles of chemically inert sapphire $(\mathrm{Al}_2\mathrm{O}_3)$ and sulfur-absorbing marble $(\mathrm{CaCO}_3)$ are used as a heat carrier. Optimal conditions for the filtration combustion of automobile tires are determined (the tire content in a mixture is $50\%$, the combustion temperature is approximately $1000^\circ$C, the mass burning rate is $0.40$ kg/m$^3$ of supplied air). It is established that the replacement of a solid inert coolant with marble has practically no effect on the combustion temperature. In this case, the composition of combustion products changes: the $\mathrm{CO}_2$ content in gaseous products increases (their combustion heat decreases from approximately $2.5$ to $2.2$ MJ/m$^3$), the yield of liquid pyrolysis products decreases approximately from $45$ to $40\%$, and the sulfur content in solid combustion products increases from $28$ to $40\%$.