Experimental Study On Suppressing Gas Explosion In Tube With Aluminium Silicate Board

The experimental investigations into premixed flame propagation in pipes or channels are great important for design and application of flame anesters, and deflagration suppression of flammable gas clouds in vessels or unconfined space. Aiming to provide theoretical references for deflagration suppression and the design of flame arresters, experimental investigations are carried out to analyze the flame and pressure wave propagation in tube lining with porous materials of aluminium silicate board on the tube wall in this paper. The main work and conclusions in this paper are as follow:(1) In experimental investigation, experimental apparatus that can measure pressure, and flame speed instantaneously are built, and high frequency data acquisition system is set up. The construction of explosion suppression is aluminium silicate board.(2) With premixed acetylene-air gases and propane-air gases, experimental investigations about explosion waves propagating and suppression in tube are dealt with. Experimental conditions are set as follow: Stoichiometric rate and atmospheric pressure are used for initial concentration of acetylene (7.75%), propane (3.95%) and initial pressure; the inside dameter and length of tube, which is closed at ignition end and open at the other, are 81 mm and 2.2 m respectively; The experimental investigations are carried out to analyze the suppression effect of aluminium silicate board on flame propagation in tubes.(3) The effects of construction of the length changes of aluminium silicate board on flame propagation speed and explosion overpressure in tube are analyzed. Empirical formulas about relationship between flame propagation speed, overpressure and the length of aluminium silicate board are obtained. With the increase of length, flame propagation speed and overpressure decrease.(4) In addition, the effects of the thickness of aluminium silicate board on flame propagation speed and overpressure are also analyzed. When the length value is set small, the phenomenon that the value of flame propagation speed and overpressure are first restrained to reduce and then increase as thickness increases, and best suppressive thickness is existed; With the increase of length and thicness, flame...