Carbon powder reacted with anhydrous potassium carbonate to produce potassium vapor at 1 100 ℃, and at the same time, 5 L/minCO2or H2O was injected into the tube furnace to make the potassium vapor and reaction gas act on coke for 2 h simultaneously.After the completion of the test, the original coke, the reacted coke without potassium,and the reacted coke within potassium were taken for optical texture identification.It was found that the reactivity of isotropic texture of the coke was higher than that of anisotropic texture under alkali-free vapor conditions.However,when alkali vapor and CO2or H2O acted simultaneously on the coke,it was found that the reactivity of isotropic texture was lower than that of anisotropic texture. This is because anisotropic texture has a strong adsorption capacity for alkali.Alkali metal has a stronger internal permeability,and possibly produces more interlayer compounds that can catalyze the gasification reaction of coke.%在1100℃下,碳粉与无水碳酸钾反应会生成钾蒸汽,同时向管式炉中通入5 L/min CO2或者H2O,使钾蒸汽和反应气体同时作用于焦炭2 h.实验完成后,对原始焦炭、无碱反应后焦炭和有碱反应后的焦炭进行光学组织鉴定.结果表明,在无碱蒸汽条件下,与各向异性组织相比,各项同性组织的反应性更高.但是,当钾蒸汽和CO2或H2O同时作用于焦炭后发现,各项同性组织的反应性却比各项异性组织的反应性低,这是因为各向异性组织对碱的吸附能力强,碱金属在其内部渗透能力较强,可能会生成更多的层间化合物,这对焦炭的气化反应具有催化作用.
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