Simulation and optimization of thermal parameter of sinter annular cooler based on enthalpy exergy of heat carrier

doi:10.11949/j.issn.0438-1157.20170406

Abstract

Abstract:

With a 405 m² annular sinter cooler as research objects, the two-dimensional steady-state numerical model of annular sinter cooler was established on the basis of the porous media and local non-equilibrium thermodynamics theory. The moving speed along with the moving direction of sinter trolley was defined into the numerical model with the help of user-defined functions in COMSOL. The main factors influencing the sinter waste heat recovery and influence laws were analyzed. The enthalpy exergy of outlet cooling air of annular sinter cooler was taken as the evaluation index of parameter optimization, and the suitable operating parameters combination of first and second stages in annular sinter cooler were obtained through the method of orthogonal experiment. The results show that when the other operating parameters are constant, the enthalpy exergy of outlet cooling air first increases and then decreases with the increase of inlet air velocity. The suitable operating parameters are as follows. The standard flow of inlet cooling air is 8.3×10⁵ m³·h^-1. The height of sinter bed layer is 1.6 m and the temperature of inlet cooling air is 424 K. Under this condition, the exergy of outlet heat carrier increases by 11.09% than existing working condition.

Key words: sintering, heat transfer, exergy, numerical simulation, orthogonal experiment

摘要：

以某冷却面积为405 m²的环冷机为研究对象，基于多孔介质和局部非热力学平衡理论，建立了环冷机二维稳态数值计算模型。借助COMSOL软件的自定义函数功能，将环冷台车沿运行方向的移动速度定义到数值模型中，研究并分析影响烧结矿余热回收的主要因素及其影响规律。以环冷机出口冷却空气的焓(火用）作为参数优化指标，并采用正交试验设计方法，得出环冷机一二段适宜的操作参数组合。结果表明：当其他操作参数不变时，随着入口风速的增加，出口冷却空气所携带的焓(火用）呈现先增大后减小的趋势。环冷机一二段适宜的操作参数为：冷却空气进口标况流量8.3×10⁵ m³·h^-1、料层高度1.6 m和进口风温424 K，此工况下出口热载体焓(火用）值比现有实际工况的提高了11.09%。

关键词: 烧结, 传热, (火用）, 数值模拟, 正交试验

CLC Number:

ZHANG Sheng, FENG Junsheng, DONG Hui. Simulation and optimization of thermal parameter of sinter annular cooler based on enthalpy exergy of heat carrier[J]. CIESC Journal, 2017, 68(11): 4129-4136.

张晟, 冯军胜, 董辉. 基于热载体焓(火用）为判据的环冷机热工参数仿真优化[J]. 化工学报, 2017, 68(11): 4129-4136.

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