Abstract
The effective and efficient utilization of byproduct fuels has gained increasing attention in all industrial fields. In this study, flame stabilization mechanisms for non-standard low-calorific value (NLCV) gases of blast furnace gas and coke oven gas have been systematically analyzed under practical operating conditions of hot air heaters. The complex oscillatory dynamics has been successfully reproduced with the unsteady perfectly stirred reactor combustion model. The differences in the combustion stabilities between NLCV gases have been further revealed, with the kinetic importance of individual variable and chemical reaction for the complex dynamics being quantified with chemical explosive mode analysis. Then the effects of gas composition and fuel blending on combustion instability are investigated. The optimal fuel switching temperature, switching schemes and oscillating combustion inhibition methods are finally proposed for stable combustion of blast furnace gas and coke oven gas. The tolerance range of flow rate fluctuations are increased by 10% and 30% with selecting fuel switching scheme and initial combustion state reasonably.
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