用于湿法净化黑烟表面活性剂筛选的数学模型研究

湿法净化燃煤窑炉中的黑烟,关键在于表面活性剂对炭黑的润湿、增溶和降低表面张力作用.根据研究筛选的数学模型,计算AEO-9和SDBS混合表面活性剂溶液的亲水亲油平衡值HLB、临界胶束浓度CMC与胶束形成吉布斯自由能ΔG0mf.通过实验测得不同配比AEO-9和SDBS溶液的CMC和处于该CMC时黑烟的去除效率η,分析混合溶液中HLB、CMC、ΔG0mf与η的关系,建立新的数学模型.结果表明,理论CMC与实测CMC吻合度较好;HLB与lnCMC]线性相关;ΔG0mf与η存在二次函数关系.降低CMC可以有效增大HLB,增加溶解度,减小形成胶束的吉布斯自由能,降低表面张力,使形成胶束的反应更容易自发进行,有效提高黑烟去除效率.

Study on the Mathematic Model About Surfactants Screening Used for Smoke Wet Purification

Surfactants increase wetting, solubilization of carbon black and reduce interfacial tension between surfactants and carbon black are very important for the wet removal of furnace smoke. Calculated hydrophile-lipophile balance value (HLB), critical micelle concentration (CMC) and Gibbs-free-energy (deltaG0(mf)) of mixed surfactants solution generated on the basis of selected mathematical models. The CMC of AEO-9, SDBS solution at different ratios and smoke removal efficiency at the CMC were gained by experiments. The relation among HLB, CMC and deltaG0(mf) in mixed surfactants were analyzed. At last, new mathematic models were established about them. The results showed that the calculated data had good agreement with the experimental data. HLB was linearly correlate with ln CMC]. There was a quadratic relationship between deltaG0(mf) and smoke removal efficiency. The reducing CMC could effectively increase HLB value and solubility, while the deltaG0(mf) and surface tension were both decreased, which could form micelles more spontaneously and enhance smoke removal significantly.