焦粉超临界水气化实验研究及热力学分析OA

Coke powder is defined as coke with a particle size of less than 5 mm.Most of it can only be treated as solid waste or low-grade fuel,because its particle size does not meet the require-ments of industrial use.As an efficient and clean energy conversion technology,supercritical water gasification(SCWG)technology provides a new approach to the the treatment of coke powder.How-ever,there has been little research on the gasification characteristics of coke powder under supercriti-cal water(SCW)conditions.The SCWG experiment of coke powder was carried out using an auto-clave experimental system.And the effects of experimental parameters on the SCWG of coke powder were investigated.By comparing the SCWG characteristics of coal with a thermodynamic equilibrium model,improvements for current SCWG technology of coke powder were proposed.The results show that when the reaction conditions are improved,the carbon gasification efficiency(CE)is 83.00%at a reaction temperature of 850℃,a reaction time of 30 min,a coke powder mass fraction of 1%,and a K2CO3-to-coke powder mass ratio of 1.0.The yields of H2 and CO2 in the gas products are much higher than those of other gases.The high H2 yield proves that the SCWG technology is sci-entifically feasible for the resource recovery of coke powder.However,due to the high fixed carbon content and low volatile content of coke powder,its complete gasification is more demanding than that of coal.Thermodynamic equilibrium analysis of SCWG reaction of coal powder indicates that when the reaction reached equilibrium,CE approaches nearly 100%.Consequently,improving the reactor design or developing more efficient catalysts to accelerate the reaction process is crucial for enhancing the SCWG of coke powder.