煤粉工业锅炉锅水碱度试验测量方法

为了在准确测量锅水碱度的前提下节约试剂,以煤粉工业锅炉的锅水为对象,研究了试剂用量和锅水取样体积对锅水碱度测量结果的影响。首先取样锅水100 m L,研究了酚酞和甲基橙试剂的用量对酚酞碱度和全碱度测量结果的影响;然后分别取样锅水100、50、25 m L,对比了取样体积和试剂用量对锅水碱度测量结果的影响。结果表明:酚酞和甲基橙试剂用量不同会导致溶液颜色不同,但对锅水碱度测量结果没有影响;锅水取样50 m L时,测量到的锅水碱度值与取样100 m L时基本相同,但锅水取样25 m L时测量误差较大。因此,从节约硫酸标准溶液和试剂的角度出发,测量锅水碱度时建议取样50 m L锅水、使用1滴酚酞试剂和1滴甲基橙试剂。

Experimental test method for alkalinity of boiler water in industrial pulverized coal boiler

In order to use small amounts of indicators to measure alkalinity of boiler water in industrial pulverized coal boiler accurately,the effects of indicator dosage and boiler water sampling volume on boiler water alkalinity measurement results were studied.First,100 mL boiler water was sampled,the influence of phenolphthalein and methyl orange dosage on phenolphthalein alkalinity and total alkalinity measurement results were researched.Then,100 mL,50 mL and 25 mL boiler water were sampled respectively,and the effects of boiler water sampling volume and indicator dosage on boiler water alkalinity measurement results were compared.The results showed that,different dosage of phenolphthalein and methyl orange affected the color of the solutions,while it had no effect on alkalinity measurement results.The measurement results were basically the same when the sampling volume were 50 mL and 100 mL.However,there was higher error while the sampling volume were 25 mL.So 50 mL sampling volume,1 drop phenolphthalein indicator and 1 drop methyl orange indicator could obtain accurate results.