Abstract

The influence of the formation of microheterogeneous soot particles on the gas-phase conversion of rich mixtures of methane with oxygen into synthesis gas in a temperature range from 1500 to 1800 K under the conditions of an adiabatic reactor was studied by kinetic modeling. The effect of CO₂ and H₂O additives on this process was studied. The appearance of soot particles was observed in rich mixtures, starting from the fuel excess factor ϕ = 3.33. At relatively low temperatures of ~1500 K, a small amount of microheterogeneous soot particles was formed, which did not significantly affect other components of the reacting system. A noticeable effect of soot particles at this temperature was observed at a higher value of ϕ = 8.0. This was most clearly manifested in the temperature profile of the process, in which two maximums were observed at times of about 0.01 and 0.1 s upon the addition of water to the reacting mixture. In the case of CO₂ additions, the second maximum in the temperature profile was almost not pronounced. A complex temperature profile led to the appearance of the second concentration maximum of hydroxyl radicals OH at times of ~0.1 s. The addition of H₂O and CO₂ made it possible to vary the H₂/CO ratio in the synthesis gas over a wide range, which is necessary for the synthesis of various products. Because the added CO₂ under these conditions was actually involved in the chemical process of obtaining synthesis gas, its partial recirculation from the conversion products made it possible to reduce its emission in the production of synthesis gas.

中文翻译：

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烟灰颗粒对气相甲烷转化为合成气的影响：H2O 和 CO2 添加剂的作用

摘要

通过动力学模型研究了绝热反应器条件下，在1500~1800 K温度范围内，微异质烟灰颗粒的形成对富甲烷与氧气的混合物气相转化为合成气的影响。_{研究了CO 2}和H ₂ O添加剂对该过程的影响。从燃料过剩系数 phi = 3.33 开始，在富混合物中观察到烟灰颗粒的出现。在约 1500 K 的相对较低温度下，形成少量微异质烟灰颗粒，这不会显着影响反应系统的其他组件。在此温度下，在较高值 phi = 8.0 时观察到烟灰颗粒的显着影响。这在该过程的温度曲线中得到最清楚的体现，其中在向反应混合物中添加水后约0.01和0.1秒的时间处观察到两个最大值。_{在添加 CO 2}的情况下，温度曲线中的第二个最大值几乎不明显。复杂的温度曲线导致羟基自由基 OH 的第二浓度最大值在约 0.1 秒的时间出现。_{H 2} O和CO ₂的添加使得可以在宽范围内改变合成气中的H ₂ /CO比率，这对于合成各种产品是必要的。由于在这些条件下添加的CO ₂实际上参与了获得合成气的化学过程，因此其从转化产物中的部分再循环使得可以减少其在合成气生产中的排放。