Suppression Effects of Hydroxy Acid Modified Montmorillonite Powders on Methane Explosions

Abstract

In this paper, montmorillonite inhibitors modified with polyhydroxy functional groups by gluconic acid (GA) were successfully prepared. The particle size distribution, composition, surface functional groups, and pyrolysis characteristics of the pure montmorillonite powders (Mt) and the gluconic acid modified powders (G-Mt) were analyzed by using a laser particle analyzer, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and thermogravimetry-differential scanning calorimetry (TG-DSC), respectively. The suppression effect of Mt and G-Mt on the 9.5% methane-air premixed gas was tested in a 20 L spherical explosion device and a 5 L pipeline experimental system. The results show that G-Mt displays a much better suppression property than that of Mt. The optimal explosion suppression effect concentration of Mt or G-Mt powders is about 0.25 g·L −1 . In this concentration, for G-Mt, the maximum explosion pressure declined by 26.7%, the maximum rate of pressure rise declined by 74.63%, and the time for the flame front to reach the top of the pipe was delayed by 242.5%. On the basis of the experimental data, the better suppression effect of G-Mt than Mt might be attributed to the presence of more hydroxyl groups on the surface.

Evaluations of Aluminum Tri-Hydroxide and Pristine Montmorillonite in Glass Fiber Reinforced Polymer for Vehicle Components

“…This could be due to the residue of alumina and water vapour from the ATH, which prevents the MMT barrier layer formation when the composite decomposition occurs [62]. Another factor that may also occur is the hydroxyl from MMT which is released then reacts with oxygen and becomes reactive [70]. This is contrary to the purpose of MMT as a flame retardant, which is to switch functions to accelerate the decomposition of polyester [58].…”

Mechanism Analysis of Airbag Explosion Suppression and Energy Absorption in a Flexible Explosion Suppression System

“…Among inert additives, CO 2 had the highest efficiency, followed by N 2 , Ar, and He. On the other hand, Song et al [13][14][15] studied the inhibition effect of inert dust and solid particle inhibitors [16] on gas explosions, finding that particle size has a great influence on inert rock dust to inhibit gas explosions. In addition, Chen et al [17,18] studied metal foam and found that it can reduce the overpressure generated, but it has little effect on the flame tip speed and shape.…”

Exceptional Performance of Flame-Retardant Polyurethane Foam: The Suppression Effect on Explosion Pressure and Flame Propagation of Methane-Air Premixed Gas

“…Scholars have made considerable progress in the field of gas explosion suppression technology. A large number of studies have focused on the use of inert gas [7][8][9][10], ultrafine water mist [11,12], and powder inhibitors [13][14][15] to suppress and mitigate gas explosions. Previous work explored the impact of various materials on the suppression of methane explosions.…”