【摘要】 为研究动态分离器在不同转子转速和碾磨出力下的分离特性,进行了现场取样测试和数值模拟。通过对入口不同粒径煤粉的质量占比进行设置,使模拟结果可以与现场测试入炉煤粉细度进行对比,得出了较为可靠的数学模型。结果表明:碾磨出力较高时提高转子转速,入炉煤粉细度R₉₀减幅变慢,转子转速为67.5 r/min左右较合适,转子转速过高会使分离电耗迅速增加而入炉煤粉细度改善不明显;碾磨出力较低时提高转子转速,入炉煤粉细度R₉₀的减幅逐渐加快,设置较高的转子转速可使煤粉更细,低负荷下稳燃效果更好。更多还原

【Abstract】 Field sampling tests and numerical simulations were performed to study the separation characteristics of dynamic separators under different rotor speeds and milling outputs. By setting the inlet mass proportion of differently sized coal particles, and comparing the fineness of coal powder between numerical simulation and field testing, a more reliable mathematical model was obtained. Results show that at high milling output, when the rotor speed is increased, the reduction of pulverized coal fineness R₉₀ would be slowed down; the appropriate rotor speed is about 67.5 r/min, and high rotor speed would result in rapidly increased separation power consumption, but slightly improved pulverized coal fineness. Whereas, at low milling output, when the rotor speed is increased, the reduction of pulverized coal fineness R₉₀ would be accelerated, and the setting of higher rotor speed would result in finer pulverized coal particles, when better combustion stabilization effects are to be obtained under low load conditions.更多还原