Experimental exploration and mechanism analysis of the deflagration pressure of methane/pulverized coal blenders inhibited by modified kaoline-containing compound inhibitors
Abstract
In this work, with the assistance of the intercalation modification approach, three kinds of intercalated compounds, dimethyl sulfoxide (DMSO), potassium acetate (KAc), and ammonium sulfamate (AS) were successively employed for modification on kaoline to prepare a modified kaolin inhibitor. Then, the TG/DTG test, SEM observation, XRD characterization, and FTIR analysis were respectively utilized to probe the thermal stability, surface structures, and functional groups of the modified kaoline inhibitor. Moreover, the compound inhibitors fabricated by modified kaoline powder blending with ammonium polyphosphate (APP) of different mass fractions were employed to inhibit the explosions of methane/pulverized coal blenders. In the explosion inhibition experiments, the concentrations of methane and coal dust were respectively selected for 9.5 % and 0.105 g/L, while the compound inhibitors with seven various mass fractions of 0.05, 0.075, 0.1, 0.125, 0.15, 0.175, and 0.20 g/L were severally chosen to explore its inhibiting effect on methane/pulverized coal blenders using the 20-L standard spherical explosion apparatus. Results show that both the modified kaoline inhibitor and its compound inhibitor demonstrate a prominent inhibiting effect on methane/pulverized coal blenders. Besides, the inhibiting effect presents the most outstanding as the mass fraction for APP of the compound inhibitor occupies 35 %. Under such a circumstance, the
- Publication:
-
Fuel
- Pub Date:
- February 2023
- DOI:
- 10.1016/j.fuel.2022.126353
- Bibcode:
- 2023Fuel..33326353Y
- Keywords:
-
- Methane/pulverized coal premixed explosion;
- Explosion inhibitor;
- Modified kaoline powder;
- Synergic explosion inhibition;
- Molecular reactions