CAJ | 학술논문

利用三维离散元法建立了无钟高炉布料模型，分析了料罐、旋转溜槽中的颗粒流动行为以及颗粒离开溜槽后的下落轨迹和料堆形成，可视化再现了装料过程。结果发现：炉料在流动过程中始终存在粒度偏析，料罐排料流为漏斗流，小颗粒由于偏析而倾向于后期排出；溜槽倾角对颗粒流动行为和料堆形成影响较大；溜槽内颗粒流由于溜槽旋转而向侧上部偏离和翻动，小颗粒因靠近壁面而位于料流内侧，大颗粒因聚集在溜槽上部而处在料流外侧，炉料颗粒偏析、偏转翻动和速度分布影响下落轨迹；在炉料下落到料面的堆积过程中，大颗粒易于向炉喉中心和边缘偏析，小颗粒因位于料流内侧和渗透作用而分布在堆尖下方且偏向中心侧。结合激光网格炉内测量技术料流轨迹测量结果，验证了模型的适用性。
이용삼유리산원법건립료무종고로포료모형，분석료료관、선전류조중적과립류동행위이급과립리개류조후적하락궤적화료퇴형성，가시화재현료장료과정。결과발현：로료재류동과정중시종존재립도편석，료관배료류위루두류，소과립유우편석이경향우후기배출；류조경각대과립류동행위화료퇴형성영향교대；류조내과립류유우류조선전이향측상부편리화번동，소과립인고근벽면이위우료류내측，대과립인취집재류조상부이처재료류외측，로료과립편석、편전번동화속도분포영향하락궤적；재로료하락도료면적퇴적과정중，대과립역우향로후중심화변연편석，소과립인위우료류내측화삼투작용이분포재퇴첨하방차편향중심측。결합격광망격로내측량기술료류궤적측량결과，험증료모형적괄용성。
A bell-less blast furnace charging model was established by using 3D discrete element method. The flow behavior of particles in the hopper and rotating chute, the falling trajectory and heaping process of particles discharged from the rotating chute were modeled and analyzed by using this model. Consequently, the charging process was reproduced visually. It is found that size segregation is always prevalent throughout the flow process of particles. The discharging flow from the hopper is funnel flow, and small particles tend to be discharged in the later stage due to size segregation. It is proved that the influence of chute inclination angle on the particle behavior and heaping process is very significance. The granular flow in the chute deviates upward to one side and tumbles attributing to rotation. Small particles close to the chute wall surface move to the inside of the stream, while large ones staying at the upper part of the chute flow move to the outside. The falling tra jectory of particles is affected by particle size segregation, deflection and tumbling, and velocity distribution. During the process of burden falling and heaping, large particles are apt to segregate to the center and periphery of the furnace throat, while small particles locate under the pile top and they are partial to the center due to locating inside the stream and permeation. The applicability of the model has been verified by the measurement results of burden tra jectories based on the laser grid in-furnace measure technology.