摘要
针对于日产6000 t的LANE型第四代篦冷机熟料冷却过程,利用用户自定义标量(UDS)法编写了气-固双能量方程仿真程序,并建立了熟料冷却换热模型。该模型下模拟所得各出口温度与实际测量值的误差均在3%以下,说明模型能够较好地反映熟料冷却过程。在此基础上,研究进一步分析了风室风速对熟料层温度、各出口温度、冷却效率、风机功率消耗以及改进熵产数的影响。结果表明:当风速小于1.33 m/s时,二、三次风出口温度随风速增加而迅速升高;当风速大于1.33 m/s时,该温度随风速增加呈缓慢下降趋势。出口熟料温度与废气低温风温度则随风速的增大而逐渐降低。改进热熵产数在风速小于0.95 m/s时,随风速增加而明显升高,当风速大于1.71 m/s后则呈缓慢增长;改进耗散熵产数、风机总功率及冷却效率均随着风室风速的提高而逐渐增加,其中冷却效率在风速小于1.33 m/s时,变化较为显著。基于响应面法,并在保证各出口温度满足相应约束条件的前提下,以冷却效率最大、风机总功率最低及总改进熵产数最小为优化目标,对风室风速配比进行了多目标优化,获得了三种配风优化方案。结合工程应用需求,并以降低能耗为主要目标,最终选择了风机总功率最低的方案,该方案可使风机总功率减少4.11%。
For the clinker cooling process of a 6 O00 t/d LANE-type fourth-generation grate cooler,a gas-solid dual-energy-equation simulation program was developed using UDS,and a clinker cooling heat-transfer model was established.The simulated outlet temperatures obtained from this model deviate from the measured values by less than 3%,indicating that the model can accurately represent the clinker cooling process.On this basis,the influence of wind-chamber air velocity on the clinker bed temperature,outlet temperatures,cooling efficiency,fan power consumption and improved entropy-generation indices were further analyzed.The results show that when the air velocity is below 1.33 m/s,the secondary and tertiary air temperatures increase rapidly with increasing velocity;when the velocity exceeds 1.33 m/s,these temperatures decrease slowly as the velocity continues to rise.The outlet clinker temperature and the low-temperature exhaust-air temperature gradually decrease with increasing air velocity.The improved thermal entropy generation increases significantly when the velocity is below 0.95 m/s and grows slowly once the velocity exceeds 1.71 m/s.The improved dissipative entropy generation,total fan power consumption and cooling efficiency all increase with air velocity,with the cooling efficiency showing more pronounced variation when the velocity is below 1.33 m/s.Using the response surface methodology and ensuring that all outlet temperatures satisfied the required operational constraints,a multi-objective optimization of wind-chamber air-velocity distribution was conducted with the goals of maximizing cooling efficiency,minimizing total fan power consumption,and minimizing total improved entropy generation.Three optimized air-distribution schemes were obtained.Considering engineering applicability and aiming to reduce overall energy consumption,the scheme with the lowest total fan power consumption was ultimately selected,achieving a 4.11%reduction in total fan power.
作者
毛娅
占海里
包卿希
刘新亮
MAO Ya;ZHAN Haili;BAO Qingxi;LIU Xinliang(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China;Sinoma(Suzhou)Construction Co.,Ltd.,Suzhou Jiangsu 215300,China)
出处
《机械设计与研究》
北大核心
2026年第1期344-351,共8页
Machine Design And Research
关键词
篦冷机
水泥熟料
数值模拟
风量
响应面法
多目标优化
grate cooler
cement clinker
numerical simulation
air flow
response surface method
multiobjective optimization
