煤粉加压密相输送实验研究

EXPERIMENTAL STUDY ON DENSE-PHASE PNEUMATIC CONVEYING OF PULVERIZED COAL AT HIGH PRESSURES

该文建立了一个接收端压力为3MPa,输送压差可达1MPa的高压密相气力输送实验系统,在其上用氮气进行了干煤粉加压密相输送实验,研究了该系统作为干煤粉加压气化炉供煤装置的工作特性,包括输送稳定性、以及输送压差与煤粉输送速率和输送管中煤粉浓度的关系等。研究结果表明,该干煤粉加压密相输送系统工作稳定,实现了高浓度低速连续的密相输送。在3MPa下,输送煤粉的固气比达到586kg/m3(气)、输送速率通量达到3775.6kg/(m2·s),输送气体速率范围为4.2m/s^6.9m/s,达到了干煤粉加压气化炉的工艺要求。分析表明,在高压、高浓度密相输送情况下,输送管中的煤粉浓度是影响输送管道压降的主要因素。

The experiment of dense phase pneumatic conveying of pulverized coal was carded out using nitrogen in an experimental setup that has the terminal pressure of 3MPa and the maximum total conveying pressure drop of 1 MPa. The operating and conveying characteristics of the setup was investigated, including the operating stability of the conveying system and relationships among pressure drop, superficial gas velocity and transport rate. The ratio of solid to gas was up to 586 kg/m^3 （at 3MPa） , solid flux of 3775.6 kg/m^2.s were achieved and superficial gas velocities were from 4.2 to 6.9 m/s in the experiment. Results indicate that dense phase conveying of pulverized coal can be operated smoothly in the conveying system, and the pulverized coal concentration in the conveying pipe controls the conveying pressure drop under the condition of high pressure dense phase pneumatic conveying.