POLYCYCLIC HYDROCARBONS IN FURNACE FLAMES

含氮、含氧和含硫的PAC属于 已知细菌诱变剂在广泛的 一系列燃烧装置。 的形成和破坏 这些物种将在湍流扩散火焰中进行研究， 天然气、液体燃料和煤粉燃烧， MIT燃烧研究设施（CRF） 的 实验允许详细表征火焰中的 在良好控制的燃烧下进行测量和取样 一般工业火焰类型的条件。 最近的研究在 MIT-CRF已经表明含氮PAC形成 优选来自燃料热解和NOX的产物。 这 观察提出了一个问题，富油/贫油 排序是控制NOx排放的首选方法， 实用的火焰，有利于这种直接的形成 致突变剂 拟议研究的主要目的是 识别PAC中含氮、氧和硫的PAC 火焰，它们对火焰生物活性的贡献 样品，并确定燃烧条件下， 他们形成了。 这些信息不仅直接 适用于工业规模的装置中的燃烧，但它 也将有助于指出适当的措施， 减少小型设备的排放， 在冷热环境中操作时有害健康排放的倾向 循环方式 详细的火焰结构测量将允许 根据局部燃烧速率对火焰数据进行解释， 形成和破坏高度致突变的PAC，并提供 燃烧过程修改的基础， 选择性还原

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.