“…3a), it becomes notable that adequate increase of platinum wire diameter enables to reduce , ae Y and, consequently, limit value of catalytic combustion e T (Fig. 3b) This value meets the experimental range of hydrogen ratio 0.95-1.95% by volume, enabling self-supporting catalytic combustion with electrical supply off [2].…”
supporting
confidence: 57%
“…Catalytic combustion in such conditions is advantageous since gaseous mixture with combustible gases admixture does not require continuous heating with only initial heating of platinum wire beyond certain critical temperature (point of ignition) [2]. In this case initial temperature of wire should exceed ignition point but less that fade point and combustible gases content in gas-air mixture should exceed the fade concentration value.…”
The proposed work describes analytical identification of hydrogen admixture concentration and catalyst temperatures limit values beyond which catalytic flameless steady combustion of gas-air mixtures at ambient temperature at platinum wires is observed. Effect of gas-air slip velocity upon considered values is shown. Initial platinum wire preheating temperatures required for catalytic ignition are determined.
“…3a), it becomes notable that adequate increase of platinum wire diameter enables to reduce , ae Y and, consequently, limit value of catalytic combustion e T (Fig. 3b) This value meets the experimental range of hydrogen ratio 0.95-1.95% by volume, enabling self-supporting catalytic combustion with electrical supply off [2].…”
supporting
confidence: 57%
“…Catalytic combustion in such conditions is advantageous since gaseous mixture with combustible gases admixture does not require continuous heating with only initial heating of platinum wire beyond certain critical temperature (point of ignition) [2]. In this case initial temperature of wire should exceed ignition point but less that fade point and combustible gases content in gas-air mixture should exceed the fade concentration value.…”
The proposed work describes analytical identification of hydrogen admixture concentration and catalyst temperatures limit values beyond which catalytic flameless steady combustion of gas-air mixtures at ambient temperature at platinum wires is observed. Effect of gas-air slip velocity upon considered values is shown. Initial platinum wire preheating temperatures required for catalytic ignition are determined.
“…Експериментально показано [3], що каталітичне горіння газоповітряної суміші з домішкою водню чи аміаку на тонкому платиновому дротику стає самопідримуючим в стійкому стаціонарному режимі після вимкнення електричного струму через дротину, якщо концентрація домішки горючого газу вища деякого критичного значення концентрації згасання при заданій температурі холодної газоповітряної суміші [4]. Такий же ефект відбувається при зниженні температури газоповітряної суміші до будь якої низької температури.…”
Section: вступunclassified
“…ibie TTT << [4]. Метою даної роботи стало визначення часу затримки каталітичного запалювання газоповітряних сумішей з домішками горючого газу, реагування якого на металевій нитці ( частинці) протікає за реакцією першого порядку.…”
Період індукції і температура горіння холодних газоповітряних сумішей з домішками горючого газу на платиновій частинці (нитці)1 Одеський національний університет імені І.І. Мечникова, вул. Дворянська, 2, м. Одеса,
“…The upper steady mode is described by linear relation of flameless combustion temperature and combustible gas admixture content for thin filament, where heat losses with radiation may be ignored [7]. It is also possible to use the linear dependence of the flameless combustion temperature on the heating current's square or the gas stream's temperature at a constant impurity concentration [8,9].…”
Ignition of gaseous combustible mixtures on catalytically active hot solid surfaces has numerous applications in many industrial processes and is a complex process that involves close interaction between surface processes and transfer processes in the gas mixture. In this paper, stable and critical states catalytic oxidation of hydrogen impurities in air on a platinum filament are considered. It is shown that filament temperature and its resistance depending on the mixture temperature and hydrogen concentration are of the hysteresis features. Within this hysteresis region, it is possible to achieve the catalytic combustion mode of hydrogen as a result preheating the catalyst filament above a certain critical value. The dependence of the limiting hydrogen's concentration on catalyst filament's diameter, above which is observed in the cold gas mixture self-sustaining catalytic combustion without electric current.
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