바이오가스와 도시가스의 혼합을 위한 혼합챔버 성능에 관한 수치해석 연구

The purpose of this study is to verify the performance of a static mixer for mixing of biogas and town gas by numerical analysis using CFD software(FLUENT). This static mixer has been designed for applying to a 5MW bio-gas turbine. The reason for designing a static mixer is that there is a need to mix town gas with biogas when there is less production of biogas in biogas sites. Non-uniformity is a main parameter related to the performance of a static mixer. So, non-uniformity in the outlet section was calculated for investigating the performance of a static mixer. Non-uniformity was based on the mole fraction of methane in a mixture of biogas and town gas. Low non-uniformity means that biogas and town gas are mixed well through this static mixer. Also, pressure drop at the outlet section of a static mixer was calculated. The pressure drop is less than 0.2% in this static mixer. In order to calculate non-uniformity and pressure drop, mass flow rates of biogas and town gas were calculated in each of air temperature conditions. As a result, this static mixer is suitable for applying to a 5MW bio-gas turbine.