Abstract

This research investigated the exhaust gas recirculation (EGR) process to recover part of the thermal and chemical energy left in the exhaust boiler stream. A theoretical energy conversion and use analysis was performed based on a small boiler. Several measurements and analyses of the operation reports provided the boundary conditions and relevant information for modelling the processes. The methodology considered the radiation from exhaust gases, thermodynamics balances, and financial engineering calculations for the energy recovery analysis. Financial results indicate that the exhaust gas recirculation process implementation, regarding 20% of the EGR ratio, presented 69% and 1.45 years of internal returning rate and payback, respectively. However, the regenerative process presented an internal returning rate and payback values of 112% and 0.9 years. Indeed, both processes might be applied in order to increase efficiency and reduce emissions.

中文翻译：

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基于废气再循环和热再生过程的能量回收在燃木锅炉中的应用

摘要

这项研究调查了废气再循环 (EGR) 过程，以回收废气锅炉流中剩余的部分热能和化学能。基于小型锅炉进行了理论能量转换和利用分析。运行报告的多次测量和分析为过程建模提供了边界条件和相关信息。该方法考虑了废气辐射、热力学平衡和能量回收分析的金融工程计算。财务结果表明，废气再循环工艺的实施，在EGR率20%的情况下，内部收益率和投资回收期分别为69%和1.45年。然而，再生过程的内部收益率和投资回收期分别为 112% 和 0.9 年。事实上，这两种过程都可以应用以提高效率并减少排放。