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.
Highlights
As is well known, a methane–air mixture is a type of explosive gas and is the main component of natural gas, biogas, and coalbed methane
The explosion pressure parameters of the methane explosion, suppressed by different concentrations of montmorillonite powders (Mt) and G-Mt, were tested by using the 20 L spherical explosion instrument, and the flame propagation behavior was measured in the pipeline test system, which had a cross-sectional area of 100 × 100 mm2 and a length of 500 mm
Clean, nontoxic and low-cost inhibitors, with polyhydroxy functional groups modified by gluconic acid, were obtained through a simple stirring method
Summary
A methane–air mixture is a type of explosive gas and is the main component of natural gas, biogas, and coalbed methane It is a high-quality clean fuel as well as an important raw material for the manufacture of syngas, as well as many chemical products that are usually transported through the pipeline network [1]. Montmorillonite was modified by gluconic acid, and montmorillonite powders with polyhydroxyl functional groups were obtained. The explosion inhibition effects of the montmorillonite powders with polyhydroxyl functional groups on methane explosions were investigated using a 20 L stainless steel spherical vessel and a 5 L pipeline experimental system. Based on the experimental results, a possible suppression mechanism was discussed
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