Na2CO3喷雾液滴吸收SO2气液两相反应的原位测量

发展湿法烟气脱硫气液两相反应进程的原位在线测量技术有助于研究脱硫反应的传质过程，提高脱硫效率.本文选取双碱法中的Na₂CO₃喷雾液滴吸收SO₂气液两相反应作为测量对象，利用自行研发的紧凑型彩虹折射仪搭建了全场彩虹测量系统，测量了喷雾液滴的折射率，通过反应过程中雾滴折射率的变化表征Na₂CO₃喷雾液滴吸收SO₂气液两相反应的进程.结果表明，随着Na₂CO₃喷雾液滴吸收SO₂气液两相反应的进行，喷雾液滴中的溶质Na₂CO₃逐渐转变成Na₂SO₃，液滴的折射率逐渐增大.依据Na₂CO₃的转化比例随液滴折射率的线性变化，推算出测量段内Na₂CO₃消耗量约为62.1%，进而计算出Na₂CO₃喷雾液滴吸收SO₂气液两相反应速率为8.8×10^-6kmol/（m²·s）.

In-situ measurement of absorption of SO2 by Na2CO3 spray droplets

In-situ and on-line measurement of flue gas desulfurization reaction is critical for understanding mass transfer process during SO₂ absorption in a spray tower and improving desulfurization efficiency. The absorption process of SO₂ by Na₂CO₃ spray droplets was characterized. A Global Rainbow Technique (GRT) system was set up to measure the refractive indices of spray droplets. SO₂ was absorbed by Na₂CO₃ spray droplets, generating Na₂SO₃. Refractive indices of spray droplets gradually increased with the desulfurization reaction process. The linear relationship between the refractive indices of spray droplets and Na₂CO₃ consumption made it possible to evaluate the desulfurization reaction process quantitatively. The Na₂CO₃ consumption was about 62.1% and the absorption reaction rate was thus 8.8×10^-6kmol/(m²·s).