In high temperature kilns fuel is an important subject since it may cause high influence in the total costs of products. In these cases issues related to energy efficiency are a permanent quest. Thus some studies were performed with the objective of helping the energy efficiency improvements in high-temperature industrial processes like lead crystal glasses and sodium silicate. By data collection and a validated numerical simulation a thermal balance was developed. In the second step technical actions were commented. Regarding the results, the study showed that up to 80% of kiln inlet energy is lost by chimney, walls and ceiling of kilns. The computational model demonstrated that wall thermal insulation improvements can reduce up to 4% of thermal losses if kiln wall thickness is considerably enlarged. There was no significant temperature increasing in sodium silicate kiln when burner and chimney have moved their position. A low cost heat exchanger was modelled using numerical simulation. This equipment resulted in an estimated efficiency up to 18% for the case of sodium silicate kiln and provided 250°C heating for air outlet flow.
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