生物质热裂解双仓式气力输送喂料装置输料特性

Conveying characteristics of double bins feeding device for biomass fast pyrolysis

设计制造了一套生物质热裂解用双仓式气力输送喂料装置,研究流化气速、喷动气速、有效喷射距离(s=50mm、100mm、150mm、200mm)、输料管内径(d1=21mm、24mm、29mm)和生物质颗粒粒径对进料率的影响。试验结果表明,进料率随着流化流速、喷动气速、输料管内径、生物质颗粒粒径的增大而增大。在有效喷射距离为100mm时,进料率最高。固气比随着流化气或喷动气速的增加先增加后降低,在流化气和喷动气的共同作用下,随着气体流速的增加固气比一直在降低。为了描述进料率与喷动气速、流化气速、有效喷射距离、输料管内径以及生物质颗粒粒径之间的关系,采用多元线性回归分析,建立了多元线性回归模型。开展了额外试验验证模型的准确性,结果表明试验值和预测值误差在±10.2%以内,表明所建立的模型可靠,可以利用该模型预测喂料器的进料率。

A double bins pneumatic feeding device for biomass pyrolysis was designed and manufactured.The feeding rate of the biomass power was studied at the different fluidization gas velocity, injection gas velocity, effective injection distance(s=50 mm,100 mm,150 mm,200 mm), inner diameter of conveying pipe(d1=21 mm,24 mm,29 mm) and biomass particle size. The experimental results showed that the feeding rate increased with the increase of fluidization gas velocity, injection gas velocity, inner diameter of conveying pipe and biomass particle size. When the effective injection distance was 100 mm, the feeding rate was the highest. The solid-gas ratio firstly increased and then decreased with the increase of fluidization gas velocity or injection gas velocity. Under the combined action of fluidization gas and injection gas, the solid-gas ratio decreased with the increase of gas flow velocity. To describe the link of the feeding rate with the fluidization flow velocity, injection flow velocity, effective injection distance, inner diameter of conveying pipe and biomass particle size, a multivariate linear regression model was established by using multivariate linear regression analysis. Extra experiments were carried out to verify the accuracy of the model. The results showed that the error between the experimental value and the predicted value was within ±10.2%, which indicated that the model was reliable and could be used to predict the conveying efficiency of the feeder.