垂直下降管散体颗粒换热实验台设计与应用

Design and Experiment of Downward Vertical Tube for Heat Transfer of Particles

为研究陶瓷球固体热载体与生物质粉颗粒及空气的换热机理,设计了一种分离式垂直下降管颗粒换热实验装置,该装置可以进行陶瓷球和生物质粉2种流动特性完全不同的散体颗粒的换热实验研究。喂料实验表明:陶瓷球和生物质颗粒下料均匀可调、分离完全。根据90℃陶瓷球与室温空气换热实验数据,分析计算出陶瓷球与空气的对流换热系数为291.3 W/(m2.K);以陶瓷球质量流量为1.0、1.2、1.4 kg/min,陶瓷球与生物质粉质量比为15、20、25进行的颗粒换热实验结果表明,随陶瓷球流量、陶瓷球与生物质粉质量比的增大生物质粉升温增大。

In order to investigate the heat exchange mechanism between the ceramic balls heat carrier, biomass particles and air, a downward vertical flow tube of particles separation apparatus was developed and the heat exchange experiments with ceramic balls heat carrier and biomass particles can be conducted with the apparatus. The feeding experiments of particles showed that the feeding rate of the ceramic balls and the biomass particles were stable and these two kinds of particles were separated completely. Based on the data obtained from the heat exchange experiments among the ceramic balls at 90~2 and the air at room temperature, the convective heat exchange coefficient between the ceramic balls and the air was worked out and the value was about 291.3 W/（m2＂ K）. The heat transfer experiments of ceramic balls and biomass particles at the condition of ceramic balls＇ mass flow rate were 1.0, 1.2 and 1.4 kg/min, mass ratio of ceramic balls and biomass particles were 15, 20 and 25 respectively. The results indicate that the temperature variation of the biomass particles increases with the increase of ceramic balls mass flow rate and the mass ratio of ceramic balls and biomass particles.