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针对生物质中氯、碱金属含量高的特点,在生物质与煤混燃的情况下,建立Hg/C/H/O/N/S/Cl/K/Na模型,结合化学动力学计算及敏感性分析,并运用Chemkin 4.1和Fluent 6.3软件实现化学动力学与流体动力学耦合,来模拟不同Cl2体积分数下汞的均相氧化,并探讨了生物质中的碱金属对汞均相氧化的影响.结果表明:Hg的氧化活性受到温度的限制,Hg的氧化主要发生在800K左右的温度区域,此时Hg的氯化活性是最强的,但此时K的氯化活性最弱,促进了HgCl2的生成;在有碱金属存在的情况下,碱金属与Cl2的反应对Hg氧化有抑制作用,但碱金属与SO2的反应对Hg氧化有促进作用.
Aiming at the characteristics of high content of chlorine and alkali metal in biomass, a Hg / C / H / O / N / S / Cl / K / Na model was established under the condition of biomass and coal blending. Sensitivity analysis and Chemkin 4.1 and Fluent 6.3 software were used to realize the coupling of chemical kinetics and hydrodynamics to simulate the homogeneous oxidation of mercury under different Cl 2 volume fractions and to investigate the effect of alkali metals in biomass on the homogeneous oxidation of mercury .The results show that the oxidation activity of Hg is limited by the temperature, and the oxidation of Hg mainly occurs in the temperature range of about 800K, at this time, the chlorination activity of Hg is the strongest, but the chlorination activity of K is the weakest, The formation of HgCl2; in the presence of alkali metals, the reaction of alkali metal with Cl2 can inhibit the oxidation of Hg, but the reaction of alkali metal with SO2 can promote the oxidation of Hg.