水冷壁气化炉熔渣流动的实验研究

水冷壁气流床气化炉的核心思想是"以渣抗渣",因此对熔渣沉积形态与流动规律的研究尤为重要。文中在实验室小型水冷壁气化炉热模装置上,以神府煤气化灰渣、柴油和纯氧气为原料模拟气流床水冷壁气化实验,采用高温内窥镜并结合数字图像处理技术研究了熔渣的沉积、流动过程。实验结果表明:气化炉操作温度高于熔渣临界黏度温度时,渣层表面灰渣处于熔融状态;运动到壁面处的灰渣颗粒主要被熔融渣层吸收;熔渣的流动速度和渣层表面温度有关系,渣层表面温度越高,熔渣流动速度越大。在实验条件下,熔渣层表面速度约为0.002 6—0.003 m/s。

Experimental study of slag flow on membrane wall in entrained-flow gasifier

The core idea of membrane wall-lined gasifier is ’using slag to protect the gasifier’,so the study on the slag deposition and flow law is especially important.With Shenfu slag,diesel oil and pure oxygen as raw materials,the slag deposition and flow were studied in a lab-scale membrane wall-lined entrained-flow gasifier via endoscope and digital image processing technology.The results show that when the temperature of gasifier is higher than that at slag critical viscosity,the slag in the surface is in molten state;the char particles reached the reactor wall are mainly captured by the molten slag layer;the slag flow velocity is influenced by the slag surface temperature,that is,the higher the temperature,the faster the speed.The slag velocity is about 0.002 6-0.003 m/s under the experimental conditions.