天然气混合催化燃烧特性

Characteristics of Hybrid Catalytic Combustion of Natural Gas

利用二次补燃技术研究天然气催化燃烧过程中的NOx、未燃碳氢(UHC)和CO排放及载体出口端温度的变化,找出适当的一次、二次燃料配比,使其产生最佳的排放效果.实验表明,适当的二次补燃有助于减少NOx排放,而CO、UHC排放仍旧维持较低水平.但随着二次补气量的增加,尽管NOx排放量变化不大,但当二次补气量超过某值时,CO、UHC排放会有所增加.研究还表明,二次补燃可以降低蜂窝陶瓷载体温度,避免了载体由于受到高温产生的热应力而导致的破裂以及催化剂由于高温而失效.

Secondary natural gas supply was used to study emissions such as NOx, CO and unburned hydrocarbon （UHC） and the temperature at the outlet of catalytic monolith as well. The suitable proportion of first fuel supply to the secondary was found for lower combustion emissions. The experimental results showed that the appropriate secondary fuel supply helped to reduce NOx emission, while CO and UHC emissions still remained low. However, with the increase of secondary fuel supply, though NO~ emission almost kept uncharged, CO and UHC emissions constantly increased when the secondary fuel volume was more than a certain amount. Meanwhile, the experiments also showed that the secondary fuel supply reduced the temperature in the catalytic monolith, which helped to protect the catalytic monolith from fracture caused by high heat stress and from deactivation of catalyst caused by high temperature.