Research Of Shengli Coalfield Lignite Preparing For Gasification Briquette

Lignite has rich reserve, lower coal rank and low price. The development of utilization technologies of lignite has important significance. In the paper, Shengli coalfield lignite is prepared for gasification briquette with binder, cold press molding, which is completed. As indexes of gasification briquette containing broken strength, thermal stability, chemical reactivity, coal ash fusibility(ST), the paper researches molding technology(the particle size distribution, molding pressure, molding moisture), and the binder(inorganic, organic binder, biomass) to the influence of the preparation of gasification briquette.Conclusion:①The single factor test shows the conclusion that the best molding technology is the particle size distribution of the modulus m=0.4(3～2mm accounted for15%,2～1mm accounted for21%,1～0.5mm accounted for15%,-0.5mm accounted for49%), molding pressure45MPa, molding moisture18%;②Particle size distribution, forming pressure, added amount of PVA, added amount of bentonite are designed to four factors and three levels orthogonal experiment. The orthogonal experiment shows the conclusion that the optimal decision is pressure45MPa, added amount of PVA0.9%, added amount of bentonite12%, particle size distribution m=0.4, in which t the broken strength is94.8%, the thermal stability is94.8%, the Aad is22.5%, the chemical reactivity is more than90%, the coal ash fusibility is more than1250℃;③Corn stalk modified, prepared for biomass binder with alkali liquor, and bentonite are composited for composite binder. The composite binder of biomass-bentonite is prepared with the condition that the concentration of sodium hydroxide (1%), alkali boiling time (4h), amount of corn stalk(20%), added amount of bentonite12%, in which the broken strength and the thermal stability is more than85%, the coal ash fusibility is more than1270℃, the chemical reactivity is more than90%.The paper also researches chemical reactivity of the gasification briquette in the oretical studies. The molding pressure and bentonite reduce the chemical reaction of the gasification briquette.Using infrared spectroscopy and scanning electron microscopy, the paper holds that physical-chemical force between binder and coal particles, chemical bond force in molding process, Vander Waals force and mechanical interlocking between coal particles.