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摘要: 用热重法研究了氧化锌脱硫中氢氧的气氛效应以及氢氧共同存在下氧化锌脱硫的微观动力学行为。实验温区为200 ℃～320 ℃，氧化锌粒度为100目～120目。研究结果表明，在0%～40%的体积浓度范围内，氢可促进脱硫反应进行；氧则由于会引起氧化锌表面析硫使得脱硫过程随其浓度的变化复杂化。氢氧双气氛下，氧化锌脱硫动力学行为可用改良收缩核模型进行描述，表面反应活化能和固体扩散活化能分别为14.96 kJ/mol和46.77 kJ/mol。Abstract: Effect of hydrogen and oxygen on H2S removal by ZnO desulfurizer were investigated by thermogravimetric analysis. The microkinetics of desulfurization in the presence of hydrogen and oxygen were also studied. Experiments were carried out with spherical grain of 100mesh～120mesh, at temperatures from 200 ℃ to 320 ℃. The results show that hydrogen could accelerate the reaction in the range of 0%～40%. Oxygen had complicated influence on H2S removal because of the deposition of sulfur. The kinetic behaviors of desulfurization could be described by improved shrinking core model. The activation energies of reaction and diffusion were 14.96 kJ/mol and 46.77 kJ/mol, respectively.
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Key words:
- zinc oxide /
- desulfurization /
- gas effect /
- kinetics
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