Combustion Characteristics of 0.5 MW Class Oxy-Fuel FGR (Flue Gas Recirculation) Boiler for CO2 Capture

Energies

Hyouck-Ju Kim¹  Joon Ahn² 

[1] Korea Institute of Energy Research, Daejeon 34129, Korea;School of Mechanical Engineering, Kookmin University, Seoul 02707, Korea;

关键词: oxy-fuel combustion;    industrial boiler;    heat flux;    emission;   

DOI  :  10.3390/en14144333

来源: DOAJ

【 摘 要 】

A 0.5 MW class oxy-fuel boiler was developed to capture CO₂ from exhaust gas. We adopted natural gas as the fuel for industrial boilers and identified characteristics different from those of pulverized coal, which has been studied for power plants. We also examined oxy-fuel combustion without flue gas recirculation (FGR), which is not commonly adopted in power plant boilers. Oxy-fuel combustion involves a stretched flame that uniformly heats the combustion chamber. In oxy-natural-gas FGR combustion, water vapor was included in the recirculated gas and the flame was stabilized when the oxygen concentration of the oxidizer was 32% or more. While flame delay was observed at a partial load for oxy-natural-gas FGR combustion, it was not observed for other combustion modes. In oxy-fuel combustion, the flow rate and flame fullness decrease but, except for the upstream region, the temperature near the wall is distributed not lower than that for air combustion because of the effect of gas radiation. For this combustion, while the heat flux is lower than other modes in the upstream region, it is more than 60% larger in the downstream region. When oxy-fuel and FGR combustion were employed in industrial boilers, more than 90% of CO₂ was obtained, enabling capture, sequestration, and boiler performance while satisfying exhaust gas regulations.

【 授权许可】

Unknown