膜蒸馏MDEA脱硫剂再生技术实验研究

利用MDEA溶液脱除烟气中的酸性气体在工业中得到广泛的应用,但富液再生过程中,温度过高会加速MDEA的氧化降解,增强解析出来的酸性气体对设备的腐蚀。而且回收再利用技术不足始终是束缚该技术发展的最大问题。本文分别采用汽提法和膜蒸馏技术再生MDEA富液。从两种再生实验的结果可以得出：MDEA再生率都会随着温度的升高不断增大,当升高到一定温度时,其再生率各趋于一定值;两种方法的最大再生率相近,且此时膜蒸馏再生的最佳温度比汽提法再生的温度低47.8%。从对比试验中可以看出,膜蒸馏再生MDEA富液可以降低能耗,产生很高的经济效益,在今后工业中的大规模应用具有指导意义。

Study on Regeneration MDEA Solution Using Membrane Distillation

Cleaning acid gases in flue gas by MDEA is used widely.But during the regeneration of MDEA,the temperature of MDEA solution is higher which will not only accelerate the oxidative degradation of MDEA,but also enhance the corrosion of equipment by gases which are resolved from the solution.The deficiency of the technology of regeneration is also the biggest restriction for its use.Technologies of stripping and membrane distillation are introduced in this paper.Conclusions can be made from the two experiments that the regeneration rates of MDEA rise with the increase of temperature.But the rate increased slowly when the temperature arrived at one value.The optimum temperature of membrane distillation is 59% more than that of stripping when the maximum regeneration rates of the two are close.So the regeneration of MDEA by membrane distillation can reduce energy and produce much economic benefit which can be largely used as a guideline for industries in the future.