【摘要】 利用EDTA络合滴定法测量了6种湿法脱硫用灰石中的CaCO3和M gCO3含量,其中CaCO3含量较为稳定,一般都在89%~93%范围内,而M gCO3含量的波动较大,可在1.0%~8.5%之间变化.依照我国电力行业标准(DL/T943—2005),对石灰石反应速率的时间指标进行分析,其值在25~120m in之间变化.结合实验数据和颗粒溶解缩核模型,提出具有明确物理意义的石灰石溶解速率定量分析方法.以溶液温度50℃,pH值5.5为标准溶解条件,6种石灰石颗粒在单位半径(半径为1m)下的溶解速率为0.3~1.0μmol/s.该定量分析方法对烟气湿法脱硫用石灰石的选取与系统的优化具有一定的指导意义.更多还原

【Abstract】 The contents of CaCO3 and MgCO3 in six kinds of limestone were detected using EDTA titration method.The results indicate that the content of CaCO3 is stable,which lies in range of 89% to 93%;while the content of MgCO3 fluctuates greatly,ranging from 1.0% to 8.5%.The time parameter of limestone reaction is analyzed according to Electrical Trade Criteria(DL/T 943—2005),and it lies in range of 25 to120 min.Based on the results and shrinking model,a quantitative analysis method of limestone dissolution rate is proposed,which has a legible and comprehensible physics signification.It is defined as the standard condition when temperature and pH scale of solution is 50 ℃ and 5.5 respectively.With the new definition,the dissolution rate of six kinds of limestone ranges from 0.3 to 1.0 μmol/s when radii of particles are 1 m.The proposed method is helpful for limestone selection and system optimization in wet fule gas desulfurization(WFGD).更多还原