Effects of Cementing Agent and Particle Size Distribution on Adsorption and Permeability of Briquette

Abstract

In view of the problem that the physical simulation model of gas extraction is too large to use large size raw coal for experiment, the preparation of briquette is studied. In order to make briquette and raw coal as close as possible in gas adsorption and permeability, the effects of sodium humate, carboxymethyl cellulose, sodium bentonite, polyvinyl acetate emulsion and coal tar as cementing agent on briquette adsorption and permeability are studied. Based on the consideration of pulverized coal production cost and workload, five different pulverized coal particle size distribution schemes are designed according to Horsfield filling theory, dense packing experience, and Fuller dense packing curve, and the influence of different schemes on briquette permeability is studied. The results show that: sodium humate should be used as cementing agent for comprehensive consideration of adsorbability and permeability; the particle size distribution of pulverized coal has a significant effect on the permeability of briquettes. In order to reduce the cost and workload of pulverized coal production, an appropriate pulverized coal particle size distribution scheme should be selected according to the experimental needs.

Keywords

• gas extraction
• physical simulation
• coal briquette
• cementing agent
• particle size distribution