TY - JOUR
T1 - The influence of key parameters on combustion of double gas hydrate
AU - Misyura, S. Y.
AU - Manakov, A. Y.
AU - Morozov, V. S.
AU - Nyashina, G. S.
AU - Gaidukova, O. S.
AU - Skiba, S. S.
AU - Volkov, R. S.
AU - Voytkov, I. S.
PY - 2020/8
Y1 - 2020/8
N2 - The combustion and dissociation of the double hydrate of propane-methane have been studied in terms of several key parameters: the velocity of the forced air flow U0, heat flux, temperature difference, and geometry of the work area. Simple expressions relating the dissociation rate with the specified key parameters have been obtained. The ratio of dissociation rates J1/J2 was determined, where the dissociation rates J1 and J2 correspond to the experiment with and without combustion, respectively. At U0 = 0 m/s, the ratio J1/J2 equals 8–9, and in the presence of forced gas flow J1/J2 = 11–12. Forced convection increases this ratio. Approximate correlations have been obtained for assessing the time of combustion beginning and the duration of the gas hydrate burning. The dissociation rate is nonlinearly related to the velocity U0. Two characteristic modes of gas hydrate dissociation are distinguished. Measurements of velocity fields obtained using the Particle Tracking Velocimetry (PTV) method show that the interaction of forced and free convection flows leads to a decrease in the maximum resultant velocity. Due to fuel excess over the oxidizer (violation of stoichiometric ratio), there are periodic emissions of gas bubbles, leading to incomplete combustion of the fuel. To improve the efficiency of combustion, it is advisable to use velocities U0 = 1.2–3 m/s. A further increase in U0 leads to the extinguishing of the flame.
AB - The combustion and dissociation of the double hydrate of propane-methane have been studied in terms of several key parameters: the velocity of the forced air flow U0, heat flux, temperature difference, and geometry of the work area. Simple expressions relating the dissociation rate with the specified key parameters have been obtained. The ratio of dissociation rates J1/J2 was determined, where the dissociation rates J1 and J2 correspond to the experiment with and without combustion, respectively. At U0 = 0 m/s, the ratio J1/J2 equals 8–9, and in the presence of forced gas flow J1/J2 = 11–12. Forced convection increases this ratio. Approximate correlations have been obtained for assessing the time of combustion beginning and the duration of the gas hydrate burning. The dissociation rate is nonlinearly related to the velocity U0. Two characteristic modes of gas hydrate dissociation are distinguished. Measurements of velocity fields obtained using the Particle Tracking Velocimetry (PTV) method show that the interaction of forced and free convection flows leads to a decrease in the maximum resultant velocity. Due to fuel excess over the oxidizer (violation of stoichiometric ratio), there are periodic emissions of gas bubbles, leading to incomplete combustion of the fuel. To improve the efficiency of combustion, it is advisable to use velocities U0 = 1.2–3 m/s. A further increase in U0 leads to the extinguishing of the flame.
KW - Gas hydrate combustion
KW - Gas hydrate dissociation
KW - Heat transfer
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U2 - 10.1016/j.jngse.2020.103396
DO - 10.1016/j.jngse.2020.103396
M3 - Article
AN - SCOPUS:85085948145
VL - 80
JO - Journal of Natural Gas Science and Engineering
JF - Journal of Natural Gas Science and Engineering
SN - 1875-5100
M1 - 103396
ER -