掺烧醇基燃料对天然气预混燃烧特性的影响

摘要

以甲醇为主的醇基燃料作为一种清洁能源，具有运输方便、NOx 排放低等特点，具备成为天然气补充、替代能源的可能。针对醇基燃料作为替代燃料应用于天然气燃气轮机机组的潜在需求，开展了天然气预混火焰掺烧醇基燃料的实验研究。基于天然气贫预混模型燃烧器，采用醇基燃料汽化后再燃烧的方式，开展了醇基燃料掺烧负荷比例对天然气预混燃烧特性的影响研究，从火焰结构、火焰稳定性、火焰温度和CO／NOx 排放等燃烧特性进行了对比研究。结果表明，相对于天然气预混燃烧，保持空气量和负荷不变，掺烧醇基燃料后火焰结构、火焰稳定性和CO排放等均影响不大，且能获得更低的NOx 排放。%Alcohol-based Fuel, as a liquid fuel mainly by methanol, has advantages for convenient transportation and low NOx emis-sion, could be made possible for supplemental and substitute energy.For potential requirements of the alcohol-based fuel applied in gas turbine systems fueled with natural gas, experimental study of co-firing the alcohol-based fuel in a natural gas premixed model combus-tor was conducted.The alcohol-based fuel was vaporized and mixing with natural gas.Influence investigations of co-firing heat load ra-tio of alcohol-based fuel on combustion characteristics were developed, including flame structure, flame stability, flame temperature and CO/NOx emissions.Air flux and total heat load of the premixed flame were maintained.Results indicated, compared with natural gas premixed combustion, lower NOx emission was obtained, while other flame characteristics such as flame structure, flame stability, flame temperature and CO emission show little change.