蒸汽-兰炭换热与余热回收特性实验研究

Experimental Study on the Heat Transfer and Heat Recovery Characteristics of Steam and Semi-coke

利用自行搭建的蒸汽–兰炭气固换热实验系统,研究了整个料层内兰炭与蒸汽的换热及余热回收特性,分析了颗粒平均粒径、料层厚度、蒸汽流量对兰炭余热回收量和蒸汽?增的影响规律。实验结果表明:随着换热时间的增长,料层整体平均温度以先快后慢的趋势逐渐降低,有效换热系数逐渐减小,热回收量和蒸汽的?增上升;增加料层厚度、减小兰炭颗粒的粒径、提高蒸汽流量有利于有效换热系数的增加,有效换热系数的范围在3.5~52.0 W/(m2·K)之间。此外,拟合出了粒径、料层厚度、蒸汽流量、料层整体平均温度与有效换热系数的实验关系式。

In order to study the heat transfer between semi-coke and steam,a gas-solid heat transfer experimental system was established.The effects of the particle size,material layer height,steam flow on the amount of heat recovery and energy increase were analyzed.The experimental results show that with the increase of heat transfer time,the average temperature of the whole material layer decreases slowly,the effective heat transfer coefficient decreases gradually,and the amount of heat recovery and energy recovery increase.With the increase of material layer height,the reduction of particle size and the increase of steam flow,the effective heat transfer coefficient increases in the range of 3.5~52.0 W/( m^2·K).The experimental relationship expressions between the particle size,material layer height,steam flow,average temperature of the whole material layer and effective heat transfer coefficient were fitted.