Abstract

Optimal recirculation in radiant and convective furnaces is chosen based on numerical simulations and optimal system organization principles. In optimization, the focus is on multifunctional solutions that not only increase the energy and resource conservation and decrease the environmental impact but also improve the thermodynamic efficiency. Computational experiments for radiant furnaces—specifically, coke ovens—have been used to determine the optimal gas recirculation ratio (more than twice that used in practice), in combination with cogeneration and the reduction of nitrogen oxides emissions in horizontal coke ovens with indirect heat transfer from the bottom. A multifunctional engineering solution is developed for convective furnaces with recirculation for heating a heat-sensitive material. Optimal recirculation ratio is chosen in combination with waste heat recovery in the Rankine thermodynamic cycle, ensuring cogeneration while maintaining flue gas nitrogen oxide concentrations at daily-averaged threshold limit values. The exergy efficiency of a system with the furnace is practically quadrupled.

中文翻译：

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辐射和对流炉的最佳再循环

摘要

基于数值模拟和最佳系统组织原则选择辐射和对流炉中的最佳再循环。在优化方面，重点是多功能解决方案，不仅可以增加能源和资源节约，减少对环境的影响，还可以提高热力学效率。辐射炉（特别是焦炉）的计算实验已被用于确定最佳气体再循环比（实际使用的两倍以上），并结合热电联产和通过间接传热减少卧式焦炉中的氮氧化物排放从底部。为加热热敏材料的再循环对流炉开发了一种多功能工程解决方案。在朗肯热力循环中结合废热回收选择最佳再循环比，确保热电联产，同时将烟气氮氧化物浓度保持在日平均阈值限值。带有熔炉的系统的火用效率实际上是原来的四倍。