摘要焦炭质量在一定程度上影响着炼铁指标, 而配煤结构的合理性对焦炭质量的影响程度约30%. 实际配煤过程中, 配合槽的水分设定值滞后将近24小时, 严重影响配煤切出准确率. 因此, 有必要研究配合槽内的水分分布情况和预测配合槽下切出煤料的含水率, 以指导配煤时间, 提高配煤精度.5102
本文主要利用对流方程和对流扩散方程, 建立一文情况下的水分渗透模型, 并采用有限差分方法进行求解. 通过数值模拟, 比较了对流模型和对流渗透模型, 说明对流渗透模型更接近实际情况. 另外, 建立了配合槽的加煤和切煤模型, 以模拟实际的加煤和切煤过程. 利用实验数据和现场数据, 确定和验证方程中对流速度和扩散速度涉及到的参数. 最后, 利用所建立的模型, 模拟了包含加煤, 渗透和切煤的实际过程, 并预测了不同初始含水率情况下水分的渗透结果.
关键词：水分分布模型 渗透 对流扩散方程 有限差分解法 毕业论文
Abstract
Coke quality to a certain extent, affects the ironmaking indices, and the influence degree of the rationality of structure of coal blending for coke quality of about 30%. Actual blending process, cooperate with tank water set data lag for almost 24 hours, seriously affect the coal blending cut out accuracy. Therefore, it is necessary to study moisture distribution within the tank and predict the channel incised the moisture content of the coal material, to guide the blending time and improve blending precision.
Convection equation in this paper, we use and convection diffusion equation, the model of water seepage of one dimensional case, and USES the finite difference method to solve. Through numerical simulation, compares the convection model and convective penetration model, shows that the convective penetration model closer to actual situation. Slot in addition to set up the model of coal and coal cutting, to simulate the actual process of coal and coal cutting. Using the experiment data and field data, identify and verify equation of diffusion and convection speed parameters are involved. Finally, using the established model, and simulates the containing coal, infiltration and the actual process of coal cutting, and water infiltration under different initial moisture content was predicted results.
Keywords：water distribution model, osmosis, convection-diffusion equation, finite difference method
目录
摘要 i
Abstract i
1前言 1
1.1背景 1
1.2问题描述 1
1.3对流扩散方程的介绍 2
2模型建立 3
2.1渗透模型的建立及求解 3
2.1.1假设 3
2.1.2问题分析和模型建立 3
2.1.3数值求解 5
2.1.4含水率的修正 5
2.1.5模型仿真和解释 6
2.2配煤槽中煤的增减模型 8
2.2.1切煤过程 9
2.2.2加煤过程 10
2.2.3流程 10
3模拟仿真 12
3.1基于实验数据的参数确定及检验 12
3.1.1基准对流速度和扩散速度 12
3.1.2考虑粒级 12
3.2基于现场数据的参数修正及检验 14
3.3实际过程的仿真模拟 16
4总结 20
致谢 21
参考文献 22
附录 不同初始含水率的渗透结果测算 23
1前言
1.1背景
作为还原剂, 能源和供炭剂, 焦炭广泛用于高炉炼铁, 冲天炉炼铁, 铁合金冶炼和有色金属冶炼等; 作为原料, 也应用于电石生产, 气化和合成化学等领域. 据统计, 世界焦炭产量的90％以上用于高炉炼铁, 冶金焦炭已经成为现代高炉炼铁技术的必备原料之一, 被喻为钢铁工业的“基本食粮”, 具有重要的战略价值和经济意义. 配煤槽水分分布模型的有限差分解法:http://www.751com.cn/shuxue/lunwen_2006.html