脱硫石膏还原分解特性的试验研究

摘要

采用热重分析仪对分析纯石膏、干法脱硫石膏和湿法脱硫石膏的还原分解特性进行了试验研究.结果表明：反应恒定终温、反应气氛以及杂质成分对石膏还原分解具有重要影响.在850～1 050℃反应恒定终温范围内,三种石膏的总分解率随着恒定终温的提高而增大;达到分解平衡的时间随着反应恒定终温的升高而缩短;在0.5%～5%CO体积分数下,三种石膏的总分解率和还原分解速率均随着CO体积分数的增大而增大,但增大的幅度逐渐减小;掺杂Fe2O3不仅可以提高分析纯石膏的总分解率,而且合适的Fe2O3掺杂量还可以加快分析纯石膏的还原分解反应速率.%Using thermogravimetric analyzer,reductive decomposition characteristics of analytically pure gypsum（AG）,dry FGD（flue gas desulfurization） gypsum（DG） and wet FGD gypsum（WG） were studied.Results show that the final reaction temperature,reaction atmosphere and the content of additives have significant influence on decomposition of above gypsums.With the rise of final reaction temperature in a range of 850-1 050 ℃,the total decomposition rate of above three gypsums increases,while their corresponding time necessitated for getting decomposition equilibrium decreases;whereas with the growth of CO volumetric fraction in a range of 0.5%-5%,both the total decomposition rate and the reductive decomposition rate rise,however,the rising degree gradually reduces.For analytically pure gypsum,an appropriate addition of Fe2O3 agent may help to raise not only the total decomposition rate,but also the reaction rate of reductive decomposition.