Parameter optimization through performance analysis of model based control of a batch heat treatment furnace with low NOx radiant tube burner

A model based control structure for heat treating a 0.5% C steel slab in a batch furnace with low NOx radiant tube burner is designed and tested for performance to yield optimal parameter values using the model developed in the companion paper. Combustion is considered in a highly preheated and product gas diluted mode. Controlled combustion with a proposed arrangement for preheating and diluting the air by recirculating the exhaust gas that can be retrofitted with an existing burner yields satisfactory performance and emission characteristics. Finally, the effect of variable property considerations are presented and critically analyzed.