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利用质量、化学及能量平衡建立普遍适用于双流化床气化系统的数学模型,通过预设余焦量及NewtonRaphson迭代法对模型进行求解,并将模拟结果与其他研究者的实验数据进行对比。通过引入平衡常数修正系数改进模型,改进模型的不同模拟结果与相应的实验结果非常符合,验证了改进模型对不同双流化床系统均有适用性。并用该模型模拟生物质含水率对其气化结果的影响,结果表明:含水率从0%增加至50%,所产气体中H_2及CO_2含量均增大8%~9%,CO含量减小约15%,且CH_4含量也有小幅减小,同时产气热值也明显降低。
Based on the mass, chemical and energy balances, a mathematical model universally applicable to the dual fluidized bed gasification system is established. The model is solved by presetting the aftercoke and the Newton-Raphson iteration method. The simulation results are compared with the experimental data of other researchers . By introducing the correction coefficient of equilibrium constant to improve the model, the different simulation results of the improved model are in good agreement with the corresponding experimental results, and the applicability of the improved model to different two-fluidized bed systems is verified. The model was used to simulate the effect of biomass moisture content on the gasification results. The results showed that the content of H 2 and CO 2 increased 8% -9% and the content of CO decreased when the moisture content increased from 0% to 50% About 15%, and the content of CH_4 also decreases slightly, meanwhile the calorific value of gas production also decreases obviously.