Numberical Simulation Of Pulverized Coal Oxy-fuel Combustion Process

Oxy-fuel combustion technology (also known as O₂/CO₂ combustion technology) is a new type of combustion technology. Put the fuel into the oxy-fuel(O₂/CO₂)full combustion, thermal radiation is rapidly increasing, resulting in huge energy saving potential. Oxy-fuel (O₂/CO₂) combustion technology not only has low-cost CO₂ separation and recovery characteristics, but also has a low NOx emission and high desulfurization efficiency. The advantages are obvious and the application prospects are developmental.On the based of further researches on the paper of the oxy-fuel (O₂/CO₂) combustion technology, the achievement which the predecessor had studied to establish a set of complete the oxy-fuel (O₂/CO₂) combustion of pulverized coal model was summarized . Then it structures thegeometry model, partitions the grid through the GAMBIT software, and simulates the oxy-fuel (O₂/CO₂) combustion of DC burner through the FLUENT software. The results show: compare the oxy-fuel (O₂/CO₂) combustion of pulverized coal with the air combustion of pulverized coal,oxygen concentration of 21% of the oxy-fuel (O₂/CO₂) combustion temperature is lower than the combustion temperature under air atmosphere,and the combustion temperature of the oxygen concentration of 30% of the oxy-fuel (O₂/CO₂) and under air atmosphere is basically the same. The amount of NOx generated by the oxy-fuel (O₂/CO₂) combustion is much less. In the oxy-fuel (O₂/CO₂) combustion of pulverized coal process, with the increase in oxygen concentration, SO₂ generation capacity have increased, but compared to air atmosphere, the oxygen concentration of 21% of the oxy-fuel (O₂/CO₂) combustion is less than the amount of SO₂ generated.Through the above work, the oxy-fuel combustion process of pulverized coal be displaied directly. The combustion theory and numerical simulation are integrated perfectly by the above work. It is good for the further development and consummation of the numberical simulation theory of the two-phase fuel combustion and Oxy-fuel combustion technology. At the same time, the study also provides reasonable the oretical guidance for similar burner's optimization design and operation.