Numerical study on tangential firing in furnace under the O2/CO2 atmosphere

The numerical study on furnace flow, heat transfer and combustion process for the 600MW tangential firing boiler in a power plant under the O₂/CO₂ atmosphere has been researched. The results showed that: With the oxygen molar concentration increasing, the temperature in furnace increases and the high temperature region in furnace becomes larger which is favorable to pulverized coal ignition under the O₂/CO₂ atmosphere. But considering the safety of burner and water wall slagging, the oxygen molar concentration is not too high. Oxygen-enriched combustion has little effect on the upper layer pulverized coal combustion, but it has great effect on under layer pulverized coal combustion. Compared with pulverized coal combustion under the air atmosphere, the furnace flame central position moves upward, and the characteristic of temperature distribution in furnace is beneficial to preventing water wall from slagging when the oxygen molar concentration is not too high.