换向方式对蓄热式加热炉热过程影响数值模拟

Numerical Simulation on the Effect of Switching Modes on the Thermal Process of a HTAC Reheating Furnace

基于商业软件CFX4.3和自编程序,建立了三维非稳态HTAC加热炉内热过程的CFD仿真系统,并以国内某HTAC加热炉为对象,分析了不同的换向燃烧组织方式对HTAC加热炉内多烧嘴喷射射流的卷吸、燃烧现象以及钢坯在炉内的加热过程的影响。结果表明:采用分段同侧换向控制的HTAC加热炉能获得很好的流场和温度场分布,基本满足高质量的钢坯加热需要,但该炉在生产条件下的温度制度存在不合理之处,在今后设计和操作中应进一步优化和改进;全同侧换向控制的火焰布置方式不利于钢坯的均匀、快速加热;而采用交叉换向控制的火焰布置方式可以改善加热炉内的流场和温度分布,更有利于满足钢坯的加热工艺要求。

Based on commercial software CFX4.3 and some self-programming codes, a 3-D CFD simulation system for simulating thermal process in a continuous heating furnace by using high temperature air combustion technology was developed. The effect of switching modes on the entrancement, combustion and billet heating process in furnace were analyzed numerically, and the computational results were compared with production records and onsite measurement, which verified the practicability of this CFD system. The results demonstrated that the flow pattern and the distribution of temperature in the HTAC reheating furnace with partial same-side-switching combustion mode were favorable to satisfy the high quality requirements of reheating. But the de.sign and operation of current state were still need to be optimized to improve the temperature schedule of billet heating. Compared to the results with current mode, the distribution of flow and temperature in HTAC reheating furnace with same-side-switching combustion mode can＇t satisfy the heating process, while the distribution of flow and temperature can be improved by using crossed-switching combustion mode, which was favorable to satisfy the heating process of billets.