POLYCYCLIC HYDROCARBONS IN FURNACE FLAMES

含氮、含氧和含硫的PAC属于 已知在广泛的环境中产生的细菌诱变剂 燃烧装置的范围。的形成和破坏 这些物种将在湍流扩散火焰中进行研究 使用燃烧的天然气、液体燃料和煤粉 麻省理工学院燃烧研究设施(CRF)的隧道。这个 实验允许详细描述火焰中的 燃烧控制良好情况下的测量和采样 通用工业火焰类型的条件。最近的研究，位于 麻省理工学院-CRF已经表明，含氮PAC形成 优先来自燃料热解和NOX的产物。这 观察引发了这样一个问题：燃料丰富/燃料贫乏 排序法是我国NOX排放控制的首选方法 实践的火焰，有利于这种直接的形成 代理诱变剂。拟议研究的主要目标是 确定环境中含有氮、氧和硫的PAC 火焰，它们对火焰生物活性的贡献 并确定在何种燃烧条件下 它们已经形成了。这样的信息不仅会直接 适用于工业规模装置的燃烧，但它 也将有助于表明适当的措施，以 减少小型设备的排放，这些设备具有更大的 在冷热环境下运行时产生有害排放的倾向 循环方式。 详细的火焰结构测量将允许 对火焰数据的解释以当地的 高度致突变的PAC的形成和破坏，并提供 针对它们的燃烧过程改进的基础 选择性减量。

Nitrogen-, oxygen- and sulfur-containing PACs are among the bacterial mutagens which are known to be produced within a wide range of combustion devices. The formation and destruction of these species will be studied in turbulent diffusion flames of natural gas, liquid fuel and pulverized coal using the combustion tunnel of the MIT Combustion Research Facility (CRF). The experiments permit detailed characterization of in flame measurements and sampling under well controlled combustion conditions of generic industrial flame types. Recent studies at the MIT-CRF have shown that nitrogen containing PACs form preferentially from products of fuel pyrolysis and NOX. This observation raises the question whether fuel-rich/fuel-lean sequencing, the preferred method of NOX emission control in practical flames, is conducive to the formation of such direct acting mutagens. Major objectives of the proposed study are to identify the nitrogen-, oxygen- and sulfur-containing PACs in the flame, their contribution to the biological activity of flame samples, and to determine the combustion conditions under which they are formed. Such information will not only be directly applicable to combustion in devices of industrial scale, but it will also be valuable in indicating the measures appropriate to reducing emissions from smaller-scale equipment which has greater propensity for unhealthful emissions when operated in a hot-cold cyclic manner. The detailed flame structure measurements will permit the interpretation of the flame data in terms of local rates of formation and destruction of the highly mutagenic PACs and provide the basis for combustion process modification aimed at their selective reduction.