基于热载体焓火用的烧结余热回收竖罐操作参数优

来源期刊:中南大学学报(自然科学版)2021年第4期

论文作者:董辉 冯军胜 张晟 赵亮

文章页码:1242 - 1251

关键词:烧结;余热回收;竖罐;焓火用;参数优化

Key words:sinter; waste heat recovery; vertical tank; enthalpy exergy; parameter optimization

摘    要:以烧结矿余热回收竖罐为研究对象,基于多孔介质和局部非热力学平衡双能量方程模型,建立竖罐内气体流动和气固传热的稳态计算模型,模拟研究烧结矿进口温度、空气进口流量和温度等操作参数对竖罐内气固传热过程的影响,并以竖罐出口空气焓火用为优化目标函数,采用全工况方法得到最大空气焓火用条件下的最佳操作参数组合。研究结果表明:竖罐出口空气焓火用随烧结矿进口温度增加而增加,随空气进口流量和温度增加先增加后减小;通过调整竖罐内空气进口流量和温度,可获得最大的竖罐出口空气焓火用;对于某钢铁企业年产390万t的余热回收竖罐,最优操作参数组合为:空气进口流量为180 kg/s,空气进口温度为333 K。

Abstract: Taking vertical tank for sinter waste heat recovery as research object, steady-state calculation model of gas flow and gas solid heat transfer in vertical tank was established on the basis of porous medium and two-equation energy model of local non-equilibrium thermodynamics. The effects of sinter inlet temperature, air inlet flow rate and temperature on the gas solid heat transfer process in vertical tank were investigated numerically. The air enthalpy exergy at the outlet of vertical tank was selected as the optimized objective function, and the optimal operating parameter combination under the condition of maximum air enthalpy exergy was obtained by the whole working condition method. The results show that the air enthalpy exergy at the outlet of vertical tank increases with the increase of sinter inlet temperature, and increases initially and decreases afterwards with the increase of air inlet flow rate and temperature. The maximal air enthalpy exergy at the outlet of vertical tank can be achieved through the adjustment of air inlet flow rate and temperature in vertical tank. For the vertical tank for waste heat recovery with an annual output of 3.9 million t sinter in an iron and steel company, the optimal operating parameter combination is as follows. The air inlet flow rate is 180 kg/s, and the air inlet temperature is 333 K.

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