天然气脱硫脱碳溶液消泡剂的筛选与应用

Screen and application on defoamer for desulfurization and decarbonization solution of natural gas

在对天然气脱硫脱碳溶液发泡原因分析的基础上,采用发泡管实验装置,以泡沫层高度h和消泡时间t为评价指标,对比分析了不同类型消泡剂的消泡能力,筛选出了合适消泡剂DF-2,并考察了消泡剂添加量、MDEA浓度、溶液温度、再生次数及Fe S杂质含量等因素对DF-2消泡剂消泡性能的影响。实验结果表明,DF-2消泡剂可以有效预防天然气脱硫脱碳溶液的发泡现象,合适添加量为质量分数0.9‰;当醇胺溶液中MDEA体积分数为50%、溶液温度为30℃时,经过多次再生使用后,DF-2消泡剂仍然可以使胺液满足泡沫层高度h<5 cm、消泡时间t<10 s的行业标准;工业中试结果也证明,消泡剂DF-2可以有效预防MDEA醇胺溶液的发泡现象,有利于醇胺溶液早日实现工业化应用。

Based on analyzing the foaming reasons of desulfurization and decarbonization solution for natural gas, the defoaming abilities of different kinds of defoamers are compared and analyzed by means of a foaming pipe experimental device, with foam layer height h and defoaming time t as evaluating indicators. The defoamer DF-2 is selected out as the suitable defoamer.The influences of the dosage amount of defoamer, MDEA concentration, temperature of solution, times of regeneration and concentration of FeS impurity on the defoaming ability of DF-2 defoamer are investigated. The experimental results indicate that DF-2 defoamer can effectively prevent desulfurization and decarbonization solution for natural gas from foaming and its proper addition amount is 0. 9 wt‰ ; DF-2 defoamer after repeated regeneration uses can still make the desulfurization and decarburization solution satisfy the industrial standards such as h〈5 cm and t〈 10 s when the volume fraction of MDEA in solution is 50% and the solution temperature is at 30~C .Results of industrial pilot test shows that DF-2 defoamer can effectively prevent MDEA solution for natural gas from foaming,which will help MDEA solution to apply commercially soon.