高湿含量粉煤密相气力输送试验研究

Experimental Study on Dense-phase Pneumatic Transportation of High Moisture Content Pulverized Coal

为获得高固气比和稳定性好的粉煤输送效果,首先采用快速水分分析仪、国标法、工业分析3种方法测量粉煤湿含量;其次研究了粉煤湿含量随输送次数增加而变化的规律,发料罐压力与充气流量及粉煤输送量的关系,固气比与表观气速的关系。结果表明:采用快速水分分析仪可快速准确测得粉煤湿含量;粉煤湿含量随着输送次数的增加而降低;总湿含量高达10.7%(质量分数)的粉煤,输送时管线压力和固相速度变化较小,因此可获得稳定的密相粉煤输送;充气总流量越大,在输送粉煤时发料罐压力越高,二者近似呈线性关系。

In order to have a high solid and air ratio and good stability transportation of the pulverized coal,the rapid moisture content analyzer,the Chinese coal standard and the industrial analysis were applied to measure the moisture content of the pulverized coal.Then the paper studied the moisture content variation law of the pulverized coal increased with the transportation times increased,the relationship between the pressure of the delivery tank and the compressed air flow as well as the pulverized coal transportation quantity,and the relationship between the solid and air ratio and apparent air velocity.The results showed that the rapid analyzer could be fast and accurately to measure the moisture content of the pulverized coal,the moisture content of the pulverized coal would be reduced with the times of the transportation increased,the total moisture content of the pulverized coal would be reached to 10.7%（quantity fraction）,the pipeline pressure and the solid phase velocity would be varied small during the transportation and the stable transportation of the dense phase pulverized coal could be obtained.The total filled air quantity more higher,the stabilized pressure of the loading tank during the pulverized coal transportation would be more higher and the filled air flow quantity and the stabilized pressure would be in a linear relationship.