Experimental and mechanism study on the explosion pressure characteristics of syngas in a tube
To ensure the safety of syngas in industrial production and use,the explosion pressure oscillation characteristics of H2/CO/Air premixed gas with different hydrogen volume fractions are studied in this paper through an experimental system built by ourselves,and the influence of dimension one factors on the pressure oscillation is also calculated using theory.It is found that the combustion-induced rapid phase transformation of syngas occurs when the hydrogen volume fraction is 70％.With the gradual increase in the hydrogen volume fraction,the overpressure curve then appears as a more obvious combustion-induced rapid phase transition phenomenon,the explosion generated by the first peak value of the overpressure gradually increases.In the open pipe,when the hydrogen volume fraction is 50％and 70％,the maximum explosion overpressure occurs in the high-frequency oscillation stage at the later stage of the curve.When the volume fraction of hydrogen is 50％,the first peak explosion overpressure and the maximum explosion overpressure are 0.043 MPa and 0.111 MPa,respectively;when the volume fraction of hydrogen is 70％,the first peak explosion overpressure and the maximum explosion overpressure are 0.057 MPa and 0.162 MPa,respectively.It is found that the combustion-induced rapid phase transition does occur in the open pipe,and the change of hydrogen volume fraction plays an important role in the change of overpressure peak and overpressure oscillation.The oscillation periods of different hydrogen volume fractions all belong to the same order of magnitude of 10-4,indicating that hydrogen volume fraction does not affect the oscillation period.With the increase of hydrogen volume fraction,the average amplitude of oscillation increases gradually,and the overpressure oscillation becomes more obvious.As the dimension one factors θ,and θ2 gradually increase,the oscillation phenomenon is strengthened.The theoretical analysis indicates that the flame propagation stage and the condensation stage of the water and wall surface are jointly driven,as well as the heat exchange stage between the flame and the cold wall surface through radiation and the condensation stage of the water and wall surface are jointly driven.The results of the study have implications for preventing the occurrence of syngas explosions.
safety engineeringsyngasexplosionoscillationdimension one factorcondensationradiation
NETL
NSTL
万方数据
维普
