摘要
离子是烃火焰中的重要质点，包括正离子、负离子和自由电子。化学电离是初级正离子和自由电子的主要来源。ＣＨＯ＋是烃火焰中最基本的初级正离子，在无氧或富燃火焰中，是另一种比较重要的初级正离子。初级负离子由中性质点吸附电子而生成。初级离子与中性质点反应生成各种次级离子。正离子对燃烧进程和燃烧产物有重要影响，特别是烃正离子对碳烟和未燃烃的产生起着决定作用。烃正离子与中性质点发生离子－分子反应，生成大分子离子和荷电碳粒，它们被电子或负离子中和即成未燃烃和碳烟。这就是碳烟生成离子机理的基本内容。负离子对燃烧进程的影响较小。
ons, including positive ions, negative ions and free electrons, are important species in hydrocarbon flames. Chemical ionization is the main source of positive ions and free electrons. CHO+ is the most fundamental primary positive ion. In non-oxygen or fuel rich flame, is another important primary positive ion. Primary negative ions are produced by electron absorption of neutral species. Primary ions react with neutral species to produce different secondary ions. Positive ions have great effect on combustion process and products. Especially, positive hydrocarbon ions play a decisive role in the formation of soot and unburnt hydrocarbon. Ion-molecule reaction between positive hydrocarbon ions and neutral species leads to large molecule ions and charged soot particulates. They are neutralized by electrons or negative ions to become unburnt hydrocarbon and soot.This is the main point of ion mechanism of soot formation. Negative ions have a little effect on combustion process.
出处
《燃烧科学与技术》
CAS
CSCD
1995年第4期347-353,共7页
Journal of Combustion Science and Technology
