Development and application of thermal mathematical model of iron ore pellet bed in grate

Based on the analysis of heat transfer mechanics, physical and chemical change of pellet drying and preheating process in grate, the mathematical model is established and solved by three-diagonal matrix algorithm. With Visual Basic 6.0 a simulation software is developed. The model is verified by measurements at a domestic pellet plant, and the temperature distribution of pellet bed is gained. Meanwhile, the influence of different operation parameters on the pellet thermal process is studied. The results can be taken as a basis of practical production control and the grate optimizing design.     

Ad Hoc网络会话密钥协商算法研究

密钥协商是构建Adhoc安全网络系统需解决的关键问题之一。针对Adhoc网络的特点,提出了一种基于Chebyshev（2P）多项式的会话密钥协商算法,利用Chebyshev（2P）单项陷门函数来构建用于Adhoc网络保密通信的会话密钥。经分析表明：该算法具有较高的安全性,在P取值较大时,该算法的性能要优于ECDH算法,适合于资源受限、拓扑结构动态变化的Adhoe网络。     

一种基于灰色理论-隐马尔科夫模型的装备故障预测方法

针对复杂电子装备的系统复杂性、故障关联性以及监测信息不完备的特点,论文提出利用HMM作为分类器,实现对早期故障因素模式的识别;研究了基于灰色理论的状态预测技术,提出基于灰色理论与隐马尔科夫模型相结合的故障预测方法,最后通过某电子装备故障发生率、故障类型与潜在故障因素之间的统计关系和特点,验证了该方法具备一定的预测精度。     

Optimization of pellet induration process parameters in rotary kiln using simulation results

In order to optimize the pellet induration process parameters of rotary kiln, a mathematical model is developed and solved by using commercial software FLUENT. Orthogonal regression has been performed by using the simulated results of the pellet induration in rotary kiln. The functional relations between pellet induration quality and process parameters are obtained. The main parameters that affect the thermal process are also discussed. The results show that the high temperature zone is longer and the local high-temperature could be avoided while the velocity difference decreases between the secondary air and the carbon particle, which leads to more uniformed temperature distribution and better induration quality. The work gives a right direction on improving of pellet production.