生物燃气及生物燃气掺氢燃烧特性的实验研究

摘要

为了获得生物燃气及生物燃气掺氢的燃烧特性,文章通过高速纹影系统在定容燃烧弹中研究了CH4/CO2在不同CO2比例、不同当量比、不同初始压力以及不同掺氢比下的层流燃烧特性.研究结果表明:生物燃气的层流燃烧速度随着CO2掺混比例的增大而降低,随着初始压力的升高而降低;生物燃气掺氢后的层流燃烧速度随着掺氢比的增大而增大;对于生物燃气及生物燃气掺氢而言,火焰的稳定性随着初始压力及掺氢比的增大而降低,随着当量比增大而增大,生物燃气中CO2的比例对火焰稳定性的影响不大.%In order to get more information of laminar burning characteristics of biogas under different compositions and hydrogen fractions, an experimental study is performed in a constant volume vessel by using the Schlieren system to investigate the laminar burning velocities of CH4/CO2premixed flames under various CO2fractions and various H2fractions associated with different equivalence ratios at atmospheric pressure and elevated pressures. The unstretched burning velocities of biogas premixed flames decreases with increasing CO2fraction. The value of unstretched burning velocities decreases with increasing initial pressure with a specific equivalence ratio and CO2fraction. The unstretched burning velocities of biogas premixed flames increases with increasing H2fraction. The flame stability decreases with the increasing pressure and hydrogen fraction, the flame stability increases with the increasing equivalence ratio, but the CO2has little influence on the flame stability.