Filtration Combustion of Ultra-Rich Methane/Air Mixtures

这是一项研究过滤燃烧（FC）的富和超富甲烷-空气混合物的等效比在1和4之间。特别关注超富混合物的超绝热燃烧，其中整个过程可以被描述为基于燃烧的燃料改性和化学合成。在这些实验中，研究的基本上是一维FC波。测定了产品的温度分布和燃烧波速以及化学成分。富波时烃类燃料在过滤波中只被部分氧化，而富波时烃类燃料在过滤波中只被部分氧化。因此，化学动力学、热释放和热传递是强耦合的。超富区超绝热（超焓）燃烧在燃料重整和合成等方面具有潜在的应用前景。初步研究表明，超富过滤燃烧制氢的可行性；在超焓多孔燃烧器中，甲烷转化为氢气的效率高达70%。研究了等效比对燃烧波速、燃烧温度和燃烧产物组成的影响；过滤速度和陶瓷材料特性（化学成分和孔径）对燃烧波结构和产物的影响；以及压力对超级巨浪的影响。

Abstract - KennedyThis is a study of filtration combustion (FC) of rich and ultrarich methane-air mixtures with equivalence ratios between 1 and 4. Particular attention is given to the superadiabatic combustion of ultrarich mixtures where the overall process can be characterized as combustion-based fuel modification and chemical synthesis. In these experiments, essentially one-dimensional FC waves are studied. Temperature profiles and combustion wave velocities as well as chemical composition of the products are determined. In contrast with the ultralean case, which results in complete burnout of the hydrocarbon fuel with formation of carbon dioxide and water, in the rich wave fuel is only partly oxidized in the filtration wave; consequently, the chemical kinetics, heat release, and heat transfer are strongly coupled. The superadiabatic (excess enthalpy) combustion in the ultrarich region has potential for such applications as fuel reforming and synthesis. Preliminary studies have shown the viability of ultrarich filtration combustion for hydrogen production; significant conversion of methane to hydrogen (up to 70%) has been achieved in excess enthalpy porous burners. The present studies include the effect of equivalence ratio on the combustion wave velocity, the combustion temperature, and the composition of the combustion products; the influences of the filtration velocity and the characteristics (chemical composition and pore size) of the ceramic materials on the combustion wave structure and products; and the effects of pressure on the ultrarich waves.