基于化学反应动力学的氨-氢混合无碳燃料燃烧爆炸机理研究  

Study on the Mechanism of Combustion and Explosion of Ammonia-Hydrogen Hybrid Carbon-Free Fuel Based on Chemical Reaction Kinetics

作　　者：滕霖 单志伟 李西贵 李卫东 罗宇 江莉龙[1] TENG Lin;SHAN Zhiwei;LI Xigui;LI Weidong;LUO Yu;JIANG Lilong(College of Chemical Engineering,Fuzhou University,Fujian Fuzhou 350108,China)

机构地区：[1]福州大学化工学院,福州350108

出　　处：《油气与新能源》2024年第1期72-81,共10页Petroleum and new energy

基　　金：国家自然科学基金青年科学基金项目“干冰颗粒碰撞聚并行为的微尺度界面演化机制研究”(52204072);国家市场监督管理总局技术保障专项项目“基于多功能光纤监测技术的燃气管道在线监测”(2022YJ17)。

摘　　要：碳中和背景下,氨-氢混合无碳燃料备受关注,但合成氨与氨分解制氢过程也存在着氨-氢混合燃爆的风险。目前对氨-氢燃烧爆炸详细机理的研究不够充分,传统的详细机理十分复杂,计算耗时过长。为了研究高压下氨-氢混合气体的燃烧爆炸特性,使用零维均质模型(即不考虑空间分布且物理和化学性质均为均匀的简化模型),采用带有误差传播的有向关系图(DRGEP)法简化现有的氨-氢燃烧爆炸详细机理,再通过敏感性分析得到基元反应较少的氨-氢燃烧爆炸简化机理。将简化机理与计算流体动力学(CFD)模型耦合,开展管道内氨-氢燃烧数值模拟。结果表明,简化机理在验证层流火焰速度和点火延迟时间等方面表现出良好的性能。在爆破压力为59.61 atm和69.97 atm下,平均激波速度的相对误差低于1.4%,精度较高;且与简化机理耦合的CFD模型节约了计算资源。研究成果有助于推动氨-氢燃烧CFD模拟技术的发展,可为氨-氢混合无碳燃料的燃烧过程及爆炸防控提供理论指导。In the context of carbon neutrality,ammonia-hydrogen hybrid carbon-free fuel has received significant attention.However,the processes of ammonia synthesis and ammonia decomposition for hydrogen production also pose risks of ammonia-hydrogen combustion explosion.Currently,research on the detailed mechanism of ammonia-hydrogen combustion explosion is not sufficient,and traditional detailed mechanisms are very complex,resulting in lengthy computational times.To study the combustion and explosion characteristics of ammonia-hydrogen mixed gas under high pressure,a zero-dimensional homogeneous model(a simplified model that does not consider spatial distribution and assumes uniform physical and chemical properties)was used.The Directed Relation Graph with Error Propagation(DRGEP)method was applied to simplify the existing detailed mechanism of ammonia-hydrogen combustion explosion.Through sensitivity analysis,a simplified mechanism with fewer elementary reactions for ammoniahydrogen combustion explosion was obtained.This simplified mechanism was then coupled with a Computational Fluid Dynamics(CFD)model to conduct numerical simulations of ammonia-hydrogen combustion in pipelines.The results show that the simplified mechanism performs well in validating laminar flame speed and ignition delay time.At explosion pressures of 59.61 atm and 69.97 atm,the average shock wave speed’s relative error was below 1.4%,indicating high accuracy;and the CFD model coupled with the simplified mechanism could save a significant amount of computational resources.This research contributes to the development of ammonia-hydrogen combustion CFD simulation technology and can provide theoretical guidance for the combustion process and explosion prevention and control of ammonia-hydrogen blended carbon-free fuel.

关 键 词：氨氢燃烧 化学动力学 反应机理 简化机理 数值模拟 爆炸 

分 类 号：O355[理学—流体力学]