改性煤矸石-海藻酸钠粉体对管道内甲烷/空气爆炸的抑爆实验OA北大核心CSTPCD

A kind of microporous modified coal gangue (MCG) with a rough surface and large specific surface area was obtained by roasting,acid-alkali excitation,and physical grinding of industrial solid waste coal gangue (CG) as raw material. Using MCG as the matrix,a new flame retardant sodium alginate (SA) was combined with MCG by mechanochemical technology (MCT) to prepare an efficient,environmentally friendly,and economical modified coal gangue-sodium alginate (MCG-SA) powder explosion suppressor. The three powders were characterized by thermogravimetric analysis,SEM analysis,and XRD analysis to determine their thermal decomposition characteristics,micro-morphology,and crystal phase composition. Through the SEM analysis,it can be observed that the powder is irregularly stacked with particles and has many micro-pore cracks,a rough surface,and a weakened agglomeration effect. The XRD analysis shows that there are characteristic peaks of SA and MCG in the composite powder,which proves that the combination of the two is successful. It is not difficult to see from the thermogravimetric analysis that the composite powder has both the thermogravimetric characteristics of MCG and SA,and the mass loss of thermal decomposition is as high as 67.02％,which has excellent heat absorption performance. Based on the self-built test platform,the effects of MCG,SA,and their composite powders on the explosion pressure and flame propagation speed of methane-air premixed gas under different compounding ratios and adding masses were investigated. The results show that MCG,SA and MCG-SA powders have good anti-explosion effect,and the anti-explosion ability of composite powders is better than that of single powders. Among them,the composite powder with a mass of 250 mg and SA mass fraction of 50％ has the most significant synergistic inhibition effect on 9.5％ methane/air explosion,and the maximum explosion pressure and maximum flame propagation velocity are reduced by 36.72％ and 68.93％,respectively. The arrival time of the maximum explosion pressure and the maximum flame propagation speed are extended by 243.36％ and 171.33％,respectively. The mechanism of explosion suppression of composite powder is mainly reflected in the barrier effect,heat absorption,adsorption,and consumption of free radicals. This research has certain research significance and reference value in the field of industrial environmental protection and gas explosion protection.