Publicou 6 edições por ano
ISSN Imprimir: 1940-2503
ISSN On-line: 1940-2554
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COMPUTATIONAL MODELLING ON PULVERIZED COAL COMBUSTION IN A 5 KW BURNER TO STUDY NO REDUCTION THROUGH CO-FLOW METHANE USED AS SECONDARY FUEL
RESUMO
Numerical simulation is performed to investigate NO reduction in pulverized coal combustion by adding co-flow methane as secondary fuel. Addition of methane can reduce overall NO by reducing the Fuel NO and by considering it as re-burn fuel as well. In general, re-burn fuel is injected downstream of the flame. We injected co-flow methane, primary air, and coal from the same plane of an axi-symmetric burner. Moreover, in all simulations, we kept the heat output constant (5 kW) for different blend conditions. The study revealed that a large quantity of NO forms within the domain, when only coal is used as fuel. With the reduction in coal and addition of methane, the total NO formation within the domain is reduced significantly. It is also observed that too great addition of methane increases the flame temperature, which increases the thermal NO and prompt NO as well. Higher flame temperature enhances the re-burn rate, thus overall NO decreases. A better coal burnt out has been observed with same conditions due to greater flame temperature.
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