A Novel Multi-Fuel Burner and its Combustion Characteristics Study

At present, biomass fuel is often injected into the rotary kiln through the ignition channel or coal fuel channel of traditional burners for cement production. However, neither of these channels is designed for the injection of biomass fuel, which results in reduced production efficiency, compromised clinker quality, unstable operating conditions, etc. In this study, we propose a novel burner with an additional channel for biomass fuel injection to address these shortcomings. A series of computational fluid dynamics simulations are carried out to study the impact of the novel burner's parameters on the temperature field and flame shape within the kiln, as well as the benefits of the novel burner when co-firing biomass and coal fuel. Experimental results show that the combustion performance of the novel burner is superior to that of the two traditional burners. The novel burner offers long-term stability, flexible control over the kiln's temperature and flame shape when the substitution rate of biomass fuel does not exceed 50%.