Abstract
Exothermic-endothermic gas generators produce atmosphere gas for furnace heat treatment by the reaction of exothermic gas and natural gas in a retort which is heated by the combustion reaction which forms the exothermic gas. Because the exothermic gas can vary in composition, depending on the air/natural gas combustion ratio and the cooling water temperature, the carbon potential of the product gas is a function of these variables as well as the ratio of exothermic gas and natural gas supplied to the retort. The overall efficiency of the process is a function of the same variables and of the thermal efficiency as well. A mathematical model was developed and a computer program was written to analyze the performance of this type of generator. From this analysis, relationships between carbon potential and dew point, CO2 content and oxygen potential of the atmosphere gas were found. The effect of all operating variables on the overall efficiency of the process was determined. It is shown that this type of generator, as it is usually operated, is 5–10 percent more efficient in the production of atmosphere gas than an endothermic gas generator. Modifications of the generator design to enhance the overall efficiency by an additional 20 percent appear to be feasible.
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