The optimum condition for ignition of gases by composite sparks

Electrostatic spark ignition of sensitive dust clouds of MIE<1mJ

“…However, as can also be seen from Fig. 2, the result from the present investigation agree with the trends of the data of Parker (1985) and Kono et al (1976).…”

“…The solid line is an estimated MIE curve based on the data points. Other data added for comparison are from Moorhouse and Williams (1974), Dietlen (1976), Kono et al (1976), Parker (1985) and Lewis and von Elbe (1987).…”

Feasibility of methods and systems for reducng LNG tanker fire hazards

“…values in m1n Table 7.4 were measured for a DC capacitive discharge. However, similar values have been reported for AC capacitive discharges (Kono, et al, 1976), ~nductive break sparks (Berz, 1959), and switching sparks (Kravchenko, 1973). Moreover, an optimum discharge duration exists which provides the smallest values of E · .…”

Measurement of minimum ignition energies of dust clouds in the <1mJ region

“…Kono et al [14] determined the lowest ignition energies for three lean concentrations of propane in air as a function of the duration of the spark. The spark generator produced composite sparks with an initiating capacitive discharge and a subsequent discharge component of variable duration.…”

“…The different phases of the discharge are known to have different abilities to cause ignition, with the rapid breakdown phase being the most efficient way of transferring electric energy to chemical ignition of gas mixtures [16,17]. Parker [15] found that the ignition energy generally increased with increasing spark duration, from about 0.3 mJ for sparks of about 0.2 s duration to 2 mJ at 100 s. Kono et al [14] found a minimum ignition energy at about 50 s spark duration, with a slightly higher ignition energy for sparks of shorter duration. For sparks of longer duration the ignition energies were significantly higher.…”