生物质热解气力进料光敏在线监测技术研究

为实现对热解用气力输送进料情况实时监测，以落叶松锯末颗粒为原料，采用遮光管内红外激光头与光敏传感器联用的方法，在自主研发的在线监测实验台上，考察了气体流量对进料率、固气比等的影响，分析了电平均值与进料率、固气比、颗粒速率的关系，并对管路各层的颗粒浓度进行了灰度图像重建。结果表明：该方法能有效实现在线监测；电平均值与进料率的变化关系和幂函数在第一象限的规律相似；电平均值与颗粒速率负相关；流体颗粒速率由管路下层到上层依次递增；距离喷嘴越远，电平均值越大，流体颗粒速率越小，颗粒分布更加分散，管路各层浓度更加均匀；圆管（DN 20 mm）流体颗粒平均速率约为0.2~0.6 m/s。

Development of biomass pyrolysis pneumatic conveying photosensitive on-line monitor technology

In order to monitor the feeding process in a pyrolysis pneumatic conveying system,a test which employs larch sawdust as the conveying material and an infrared laser combined with a photosensitive sensor monitoring method in the shading tube was carried out.An independent design test bench was used and the effects of gas flow rate on the feeding rate and the solid-gas ratio were investigated.The relationships between average signal level value,feeding rate,solid-gas ratio and average particle velocity were analyzed.Also,the particle concentration in each layer of the tube was monitored using image grayscale reconstruction technology.The results show that the online monitoring methods used are effective.The relationship between average signal level values is similar to the changes in the power function in the first quadrant.The average signal level values are inversely related to the feeding rate.The velocity of particles increases from the lower to the upper layer.The farther the distance between the nozzle and testing points,the greater the average signal level values and the smaller the velocity of particles,while the particles seems to be more dispersed and the concentration more uniform in the whole tube.The average velocity of particles in a 20 mm diameter tube is in the range 0.2-0.6 m/s.