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利用计算流体力学(CFD)技术对用于气化炉供风的梅花形和环形两种供风器的流场进行数值模拟和流场对比分析,并对分别装有这两种供风器的生物质上吸式气化炉系统的反应床层温度和产气成分等气化性能进行测试比较。结果表明:环形供风器供风时,其流场没有漩涡,主管风速和各支管风速衰减方向相逆,使供风互补趋于均匀并形成较大的供风平面;梅花形供风器各管道内流场则均存在漩涡且风速不均匀现象。气化性能试验也进一步验证,与梅花形供风器相比,环形供风器供风时,气化反应床层温度显著升高,且温度波动平缓,CO和H_2气体含量也明显提高,产气热值有效提高。说明环形供风器改善上吸式气化炉的供风均匀性以提高气化性能是可行的。
The computational fluid dynamics (CFD) technique was used to simulate the flow fields of the two kinds of plum-shaped and ring-shaped air supply devices for the gasifier supply and compare the flow field. The comparison of the gasification properties of the reaction bed temperature and the gas composition of the biomass gasification gasifier system was carried out. The results show that there is no whirlpool in the flow field and the main wind speed is opposite to the decay direction of wind speed of each branch, so that the wind supply tends to be uniform and form a larger wind supply plane. The flow field inside the pipe is both vortex and uneven wind speed phenomenon. Gasification performance test also further verify that, compared with the plum-shaped air supply, the ring-shaped air supply when the wind, the gasification reaction bed temperature was significantly increased, and the temperature fluctuations of gentle, CO and H 2 gas content was significantly increased, the production of Increased caloric value. It is feasible to improve the uniformity of the supply of gas by the annular air supply to the gasifier.