基于PSR的非绝热MILD燃烧研究

On Non-Adiabatic MILD Combustion Based on the PSR Model

本文研究了基于全混流反应器(PSR)模型的非绝热MILD燃烧的特征和形成条件。通过理论研究,本文将PSR绝热燃烧的S形曲线理论推广到非绝热的工况下,并给出了非绝热MILD燃烧的数学判据。研究表明,随着散热速率的增加,形成MILD燃烧所需的入口温度降低,燃烧后的温升减小。综合考察燃烧过程有无明显火焰锋面和燃烧前后的温升,在本文考察的范围内,散热有利于MILD燃烧的实现和保持,反之吸热不利于MILD燃烧的实现和保持。

The characteristics and establishment conditions of a non-adiabatic MILD combustion in a perfectly stirred reactor (PSR)were studied using theoretical analysis and modeling.The S-shaped curve theory of adiabatic PSR combustion was extended to non-adiabatic PSR combustion conditions, and the mathematical criteria for the establishment of non-adiabatic MILD combustion was provided in the present study.Results demonstrated that MILD combustion can be established with lower inlet temperature and the decreased temperature increase with respect to the inlet temperature as heat loss rate increased.Considering both the flameless nature of a MILD combustion and the maximum allowable temperature increase,heat loss favored,while heat gain is not conducive to,the establishment and maintenance of a MILD combustion process.