Modeling Aspects of Hazardous Waste Incineration

通过焚烧方式销毁危险液体废物是一种可行的技术，但需要仔细监测排放物和燃烧效率。过去的建模工作由于缺乏关于控制加热、汽化、混合和在实际系统中遇到的液体-废物喷雾燃烧的热、动量和传质机制的基本信息而受到限制。这项研究工作的重点是控制液相和气相之间的能量、质量和动量交换的基本过程，以及销毁危险液体废物所涉及的化学反应。研究了两种不同的几何形状：一种由通道流中的平行液滴流组成，另一种由漩涡稳定的中心体反应器组成。研究了控制危险液体废物有效销毁的许多方面，如液滴尺寸分布、多组分（燃料掺杂）液体废物流、二次雾化、反应堆几何形状、有效火焰传播和湍流等的影响。目前信息的缺乏导致了过于保守和经济上缺乏吸引力的设计。该项目的研究结果将有助于设计更高效、更安全、更经济的液体废物焚烧炉。

The destruction of hazardous liquid wastes by means of incineration is a viable technique that requires careful monitoring of emissions and combustion efficiency. Modeling efforts in the past have been limited by the absence of fundamental information on the heat, momentum, and mass transfer mechanisms controlling the heating, vaporization, mixing, and combustion of the liquid-waste sprays encountered in real systems. This research effort concentrates on the fundamental processes governing the energy, mass and momentum exchanges between the liquid- and gas-phases, as well as on the chemical reactions involved in the destruction of hazardous liquid wastes. Two distinct geometries are investigated: one consisting of parallel streams of droplets in a channel flow, and another consisting of a swirl-stabilized centerbody reactor. A number of aspects controlling the efficient destruction of hazardous liquid wastes are examined, such as the effects of droplet size distribution, multi-component (fuel-doped) liquid- waste streams, secondary atomization, reactor geometry, efficient flame propagation, and turbulence, among others. The current lack of information has resulted in overly conservative and economically unattractive designs. The results of this program will be useful in the design of more efficient, safer, and economic liquid-waste incinerators.