CAJ | 학술논문

针对水泥篦冷机内熟料堆积体的多孔介质特性，应用非热平衡理论并结合Forchheimer-Brinkman-Darcy扩展模型，建立篦冷机的渗流换热模型。采用此模型对篦冷机内水泥熟料的冷却过程进行数值模拟，获得了不同供风风速、不同篦速下的气体和熟料层温度的变化规律。研究结果表明，所建模型可以较为准确地反映水泥熟料堆积体的冷却过程；供风风速的增加虽有利于熟料颗粒的冷却，但会降低回收风的温度，不利于热量的回收，合理的供风风速区间为1.5～2.0 m/s；在产量不变的情况下，增加篦速可强化熟料的前端骤冷效果，有利于形成高品质熟料，但是过高的篦速会使篦冷机前端的气体温度偏低，不利于水泥熟料的烧成；在料层厚度不变的情况下，增加篦速，回收风温与出料温度升高，但篦速过高时出料温度偏高；综合考虑产量不变与厚度不变这两种情况下篦速对熟料冷却过程的影响，得出合理的篦速区间为0.006～0.008 m/s。
침대수니비랭궤내숙료퇴적체적다공개질특성，응용비열평형이론병결합Forchheimer-Brinkman-Darcy확전모형，건립비랭궤적삼류환열모형。채용차모형대비랭궤내수니숙료적냉각과정진행수치모의，획득료불동공풍풍속、불동비속하적기체화숙료층온도적변화규률。연구결과표명，소건모형가이교위준학지반영수니숙료퇴적체적냉각과정；공풍풍속적증가수유리우숙료과립적냉각，단회강저회수풍적온도，불리우열량적회수，합리적공풍풍속구간위1.5～2.0 m/s；재산량불변적정황하，증가비속가강화숙료적전단취랭효과，유리우형성고품질숙료，단시과고적비속회사비랭궤전단적기체온도편저，불리우수니숙료적소성；재료층후도불변적정황하，증가비속，회수풍온여출료온도승고，단비속과고시출료온도편고；종합고필산량불변여후도불변저량충정황하비속대숙료냉각과정적영향，득출합리적비속구간위0.006～0.008 m/s。
Based on the porous media characteristics of cement clinker accumulation body in grate cooler, a seepage heat transfer model of grate cooler is established with the thermal non-equilibrium theory and the Forchheimer-Brinkman-Darcy extended model. The model is utilized to make the numerical simulation of the cooling process of cement clinker in grate cooler and then the temperature variation of air and clinker can be achieved in different wind speed and different grate speed. The results show that the established model can reflect the cooling process of cement clinker accumulation body more accurately. The increase of wind speed is conducive to the cooling of clinker, but it will lower the wind temperature of the recovery. The reasonable range of wind speed is 1.5-2.0 m/s. Secondly, the increase of grate speed can strengthen the front quenching in the case of a fixed yield, which is good to formatting high-quality clinker. But the gas temperature in the front of grate cooler will decrease if the grate speed is too fast. In this way, the sintering of cement clinker is not very well. In the case of a fixed bed depth, the increase of grate speed can improve the recovery wind temperature and the discharging temperature. The discharging temperature is on the high side when the grate speed is too high. By comprehensive consideration of the influence of grate speed on the cooling process under the fixed yield and the fixed bed depth, the reasonable range of grate speed is 0.006-0.008 m/s.