掺氢对天然气燃烧室燃烧及排放特性影响数值模拟
Numerical Simulation of the Effect of Hydrogen Mixing on Combustion and Emission Characteristics of the Natural Gas Combustor
赵昊 1楼国锋 2刘少鹏 1温治 2苏福永2
作者信息
- 1. 北京科技大学能源与环境工程学院,北京 100083
- 2. 北京科技大学能源与环境工程学院,北京 100083;北京科技大学能源与环境工程学院,冶金工业节能减排重点实验室,北京 100083
- 折叠
摘要
针对以天然气为燃料的燃气轮机使用掺氢燃料后的燃烧及其排放特性开展研究,基于DLN1.0燃烧室火焰筒,采用数值模拟的方法研究不同掺氢比(H2体积分数0～30％一共7种工况)在恒定热功率和相同当量比条件下对天然气混合气燃烧过程的影响,获得火焰筒内流场、温度场和燃烧产物的分布参数以及对应关系.结果表明:随着掺氢比的增加火焰温度上升,燃烧反应区扩大,火焰筒出口处的温度分布均匀性变差;掺氢造成局部释热量的改变,会导致NOx的排放随着掺氢比的增加而呈现增加趋势;CO和CO2的排放量都有显著的减少,H2O的生成量显著增加.同时,采用所提出稀释燃烧的方法解决由掺氢造成的一系列问题,研究不同当量比工况下掺氢燃烧后的特性变化,并计算得到各个掺氢比工况下最佳的当量比值.研究成果为后续工业燃气轮机天然气掺氢燃烧技术的应用提供了理论指导.
Abstract
The combustion and emission characteristics of existing gas turbines using hydrogen-doped fuel were studied.Based on the DLN1.0 combustion chamber flame cylinder,the numerical simulation method was adopted to study the influence of different hydro-gen-doped ratios(a total of 7 operating conditions with volume fraction of H2 ranging from 0 to 30％)on the combustion process of natural gas mixture under the condition of constant thermal power and the same equivalent ratio.The distribution parameters of the flow field,temperature field and combustion product in a flame cylinder and their corresponding relationships were obtained.The results show that with the increase of hydrogen mixing ratio,the flame temperature rises,the combustion reaction zone expands,and the tem-perature distribution uniformity at the outlet of the flame tube becomes worse.Hydrogen mixing results in the change of local heat re-lease,which will lead to an increasing trend of NOx emission with the increase of the hydrogen mixing ratio.Both CO and CO2 emissions decrease significantly,while H2 O production increases significantly.At the same time,a proposed dilution combustion method was adopted to solve a series of problems caused by hydrogen mixing,the characteristics changes were studied after hydrogen mixing com-bustion under different equivalent ratios,and the best equivalent ratio was calculated under each hydrogen mixing ratio.The research results provide theoretical guidance for the subsequent application of hydrogen-doped combustion technology in industrial gas turbines.
关键词
天然气掺氢/稀释燃烧/燃烧特性/排放特性Key words
natural gas mixed with hydrogen/dilution combustion/combustion performance/emission performance引用本文复制引用
基金项目
国家重点研发计划(2017YFB0304303)
出版年
2024
NETL
NSTL
万方数据