含水量对府谷煤煤粉流动特性的影响

Influence of Moisture Content on the Flow Properties of Fugu Pulverized Coal

借用Jenike剪切测试系统和Freeman的FT4多功能粉末流动性测试仪,研究了水分含量对府谷煤粉流动性的影响,获得了煤粉的流动函数、内摩擦角、粘聚力、壁摩擦角、压缩率、透气性和流动能等一系列流动参数。研究结果表明:水分含量为3%~4%(质量分数)时煤粉流动函数较大、流动性较好、透气性好、没有粘聚现象而内摩擦角较大;水分含量在5%左右时,煤粉流动性差、粘聚力较大、壁摩擦角较大、透气性好;水分含量在7%左右时,煤粉流动性变好、粘聚力较小、壁摩擦角较小、压缩率有利于煤粉流动、但是透气性较差;当水分含量大于9%时、煤粉团聚严重、不利于煤粉流动。研究还发现,铝合金的壁摩擦角最小,适合做煤粉仓的内衬。

Flowability of Fugu pulverized coal on different moisture content was investigated by Jenike shear test system and FT4 Powder Rheometer from Freeman technology.Flow function,internal friction,cohesion,wall friction,compressibility percentage,permeability and flow energy were determined.The results show that the pulverized coal had better flow properties,fine permeability,slight cohesion and hard internal friction when the moisture content was between3% and 4%.When the moisture content increased near to 5%,the flowability became worse,and the cohesion and angle of wall friction became larger.However,when the moisture content increased to around 7%,the coal had a better flowability than before.It had a slight cohesion,a small angle of wall friction,a compressibility percentage tavorable to flowability of the pulverized coal,but a warse permeability.When the moisture content was greater than 9%,pulverized coal became hard to flow because of the action of agglomeration.The results also show that aluminum alloys had a best surface with small angle of wall friction,which can be used as the lining for pulverized coal soils.