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为研究层流炉反应管内气固两相流的运动规律,设计制造一套1∶1的冷态透明玻璃实验装置。在主气流氩气流量为1.0、1.5、2.0、2.5 m3/h时,利用粒子图像测试技术(PIV)对反应管内氩气流(以水蒸气为示踪粒子)和生物质半焦颗粒速度场进行测量。结果表明:在反应管中心处,氩气速度和生物质半焦颗粒的轴向速度相差较大,不能用氩气速度代替颗粒速度。通过对实验数据的分析计算,获得反应管内雷诺数与生物质半焦颗粒停留时间(无量纲处理后)的关联式。可将该结果用于计算热解挥发特性实验的颗粒停留时间,从而优化颗粒停留时间的计算方法,为建立更加合理的热解动力学模型提供依据。
In order to study the movement of gas-solid two-phase flow in laminar reactors, a set of 1: 1 cold-state transparent glass experimental apparatus was designed and manufactured. Argon gas flow (using water vapor as tracer particles) and biomass semi-coke particle velocity field in the reaction tube were measured by Particle Image Measurement (PIV) at the flow rates of 1.0, 1.5, 2.0 and 2.5 m3 / measuring. The results show that there is a large difference between the argon gas velocity and the axial velocity of the biomass semicoke particles at the center of the reaction tube, and the argon velocity can not be used to replace the particle velocity. Through the analysis and calculation of the experimental data, the correlation between the Reynolds number in the reaction tube and the residence time of the semi-coke particles (after dimensionless treatment) is obtained. This result can be used to calculate the particle residence time in the experiment of pyrolysis volatilization, so as to optimize the calculation method of particle residence time and provide a basis for establishing a more reasonable pyrolysis kinetic model.