A self-designed explosion suppression experimental system including sensor detection system

gas mixing equipment

data acquisition device and electric spark ignition device was set up to investigate various fuel/air premix detonation flame propagation and quenching by crimped-ribbon flame arresters in horizontal pipe that closed at both ends. Detonation experiment showed that when the concentration of flammable gas was close to the stoichiometric ratio

(4.2% propane

6.6% ethylene and 28.5% hydrogen

percentage by volume)

the evolution process from ignition to flame quenching was very short. It could be divided into four stages: slow rise

quick rise

accelerate rise and pressure fluctuation. The peak detonation pressure for propane-air and ethylene-air was higher in D 80 mm flame arrester than other diameters. When pipe diameter increased to 400 mm

the detonation pressure was decreased gradually

especially for ethylene-air the pressure was only about 3 MPa. However

the peak detonation pressure of hydrogen-air was gradually increased with the increase of the pipe diameter. The result on detonation velocity indicated that its value for the premixed gas of propane-air was quite close to ethylene-air

even a little higher. However

the value of hydrogen-air premixed gas was relatively high. With the increase of the pipe diameter

the detonation velocity tended to be more stable due to the wall heat loss

the resistance factors and some other reasons. At the same time

it might be expected that the detonation safety flame velocity would be proportional to element thickness base on the classic theory of the heat transfer. Then

by using the experimental data

the detonation safety flame velocity calculation method was derived

which would provide more accurate reference for design and selection of crimped-ribbon flame arrester.