Research on the qualitative and quantitative analysis of the physical and chemical inhibition effect of coal seam inhibitors

The present paper proposes a method for quantitatively identifying the chemical inhibition effect of the inhibitor and aims to reveal the influence of raising the pre-inhibition temperature on chemical inhibition. To be specific, first, the coal samples inhibited with the halogen salt inhibitor and the water-soaked coal samples prepared at different pre-inhibition temperatures were repeated washed with the aid of an ultrasonic cleaner to obtain the inhibited washed coal samples and the reference washed coal samples. Furthermore, the variations of indicator gases, cross-point temperatures and inhibition rates of different coal samples with the rise of pre-inhibition temperature were explored by performing temperature-programmed experiments. Besides, the variations of active groups on the surfaces of the raw and inhibited coal samples were quantitatively analyzed through Fourier transform infrared spectroscopy tests. Based on the above experimental and analysis results, chemical inhibition of the halogen salt inhibitor was preliminarily verified both macroscopically and microscopically, and the respective contribution proportions of physical inhibition and chemical inhibition of the halogen salt inhibitor to the coal seam at different pre-inhibition temperatures were determined. Meanwhile, the influence of preinhibition temperature on the inhibitory effect was disclosed. It is concluded that raising the pre-inhibition temperature can promote the contribution proportion of chemical inhibition of the halogen salt inhibitor and significantly reduce the risk of coal self-heating.