考虑瞬态传热传质过程的内燃机余热裂解甲醇的机理研究及热力学优化

应用代用燃料、改善缸内燃烧过程、回收余热是最被看好的几种内燃机节能减排技术。项目组前期提出一种集内燃机余热回收与改良代用燃料于一体的新型联合热力循环，有望解决甲醇在内燃机上直接应用的难题，并获得更好的燃烧排放性能和更高的热效率。本项目致力于解决该新型联合热力循环的核心环节—内燃机余热催化裂解甲醇涉及的几个关键科学问题：（1）内燃机瞬态排气边界条件对甲醇裂解过程的影响；（2）裂解器内传热传质过程优化方法；（3）甲醇低温催化裂解的化学反应动力学机理及热力学优化。本项目提出一套联合试验与仿真的技术路线，从热力学和化学反应动力学的角度开展对甲醇吸热裂解的过程机理研究，探索甲醇低温催化裂解规律及影响因素，提出改善甲醇裂解效率和裂解产物组分及比例的方法，实现对裂解主反应的调控和预测。本项目研究成果不仅可以为甲醇裂解气内燃机提供理论和技术支持，还可以促进甲醇制氢及甲醇/氢燃料电池等相关技术的发展。

Using of alternative fuels, improving in-cylinder combustion process, and waste heat recovery are the most promising technologies for internal combustion (IC) engine energy saving and emission reduction. The project team proposed a new combined thermodynamic cycle integrated IC engine waste heat recovery and improvement of alternative fuels, which is expected to effectively solve the problems of the direct application of methanol on IC engine and get better combustion and emissions performances as well as higher thermal efficiency..This project focuses on solving the core issues of the new combined thermodynamic cycle - catalytic dissociating of methanol by IC engine exhaust heat, which involves several key scientific problems: (1) The effects of IC engine transient exhaust boundary conditions on methanol catalytic dissociating process. (2) The optimization method of the heat and mass transfer process in methanol cracker. (3) The chemical reaction kinetics mechanism and thermodynamics optimization of methanol catalytic dissociating in low temperature condition..This project proposes a technical route combined test with simulation, which carries out research on methanol endothermic pyrolysis process from the perspective of thermodynamics and chemical reaction kinetics, explores the law and influencing factors of catalytic dissociating of methanol in low temperature condition, proposes a method to improve the efficiency of methanol dissociating and regulate the ingredient and proportion of pyrolysis products, so as to realize the goal that the leading reaction of methanol dissociation can be controlled and predicted. The research results will not only provide theoretical and technical support for dissociated methanol engine, but also promote the development of hydrogen production from methanol, methanol/hydrogen fuel cells and other related technologies.