CO2吸收模型中容积传质系数的确定

气泡微细化是“原位机械搅拌法铁水炉外脱硫技术”的关键.气液传质系数是研究气液吸收过程的基本参数.本文根据相似性原理建立水模型实验装置,并通过测定NaOH吸收CO2的速率来研究气泡微细化过程,同时根据吸收原理定量计算出容积传质系数Ak及CO2气体利用率η.当溶液pH值从12降低到9的过程中,容积传质系数为2.938×10 4m3/s,本实验所用CO2的利用率的公式可简化为:η=18.98/Qt.本论文的研究结果可为进一步研究吸收速率提供理论依据.

Determination of volumetric mass transfer coefficient for CO2 absorption model experiment

The bubble disintegration and dispersion is the key of mechanical stirring for gas injection refining in iron and steel making.The volumetric mass transfer coefficient is the basal parameter of gas absorption process.In this paper,according to the principle of comparability a water model experiment device was established,and the water model experiments were conducted.The bubble disintegration and dispersion were studied by measuring the rate of CO2 absorption in solution of NaOH.The volumetric mass transfer coefficient(Ak) and efficiency of CO2 utilization(η) were calculated according to the theory of absorption.The utilization rate of CO2 formula is η=18.98/Qt when pH change from 12 to 9,the volumetric mass transfer coefficient is 2.938×10-4 m3/s.They will provide a theoretical basis for further experiments