Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolam...Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolamine(MEA)-sulfolane-water is inexpensive and has a fast absorption rate.It is one of the most promising solvents for large-scale industrial applications.Therefore,this study investigates the mass transfer performance of this phase change system in the process of CO_(2)absorption in a packed tower.By comparing the phase change absorbent and the ordinary absorbent,it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration.In the 4 mol·L^(-1)MEA/5 mol·L^(-1)sulfolane system,the CO_(2)loading of the upper liquid phase after phase separation is almost zero,while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent,which greatly reduces the energy consumption.This study also investigates the influence of operating parameters such as lean CO_(2)loading,gas and liquid flow rates,CO_(2)partial pressure,and temperature on the volumetric mass transfer coefficient(K_(G)α_(V)).The research shows that K_(G)α_(V) increases with increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure,while the inert gas flow rate and temperature have little effect on K_(G)α_(V).In addition,based on the principle of phase change absorption,a predictive equation for the K_(G)α_(V) of MEA-sulfolane in the packed tower was established.The K_(G)α_(V) obtained from the experiment is consistent with the model prediction,and the absolute average deviation(AAD)is 7.8%.展开更多
为研究船舶混合模式脱硫过程中使用海水脱硫的主要参数(废气量、入口二氧化硫浓度、液气比)以及使用碱液脱硫的主要参数(循环液pH、废液排出量、液气比)对脱硫塔脱硫效率的影响,使用化工流程模拟软件Aspen Plus V10对W6X35型船用柴油机...为研究船舶混合模式脱硫过程中使用海水脱硫的主要参数(废气量、入口二氧化硫浓度、液气比)以及使用碱液脱硫的主要参数(循环液pH、废液排出量、液气比)对脱硫塔脱硫效率的影响,使用化工流程模拟软件Aspen Plus V10对W6X35型船用柴油机废气填料塔脱硫过程进行了模拟分析并根据模拟结果对运行参数进行了优化。模拟结果表明:海水脱硫时,液气比是重要调控参数,应根据负荷、油含硫量变化相应地在3~7 L/Nm3范围内调节合适的液气比。碱液脱硫时,废液排放量是一个重要参数,对脱硫效率、亚硫酸钠饱和结晶及废水处理量影响大,运行时应控制在0.105~0.152 kg/kW·h范围内并维持在低值;循环液pH、液气比对脱硫效率和运行经济性影响较大,循环液pH以6.5为宜、液气比以3~4 L/Nm^(3)为宜。展开更多
基金The National Natural Science Foundation of China(NSFC-Nos.22138002,22078083,and 21978075)the Hunan Key R&D Program Project(2020NK2015)+2 种基金National Key R&D Projects in Changsha(kh2005018)National Key Research&Development Program-Intergovernmental International Science and Technology Innovation Cooperation Project(2021YFE0112800)the science and technology innovation Program of Hunan Province(2020RC5032)。
文摘Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolamine(MEA)-sulfolane-water is inexpensive and has a fast absorption rate.It is one of the most promising solvents for large-scale industrial applications.Therefore,this study investigates the mass transfer performance of this phase change system in the process of CO_(2)absorption in a packed tower.By comparing the phase change absorbent and the ordinary absorbent,it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration.In the 4 mol·L^(-1)MEA/5 mol·L^(-1)sulfolane system,the CO_(2)loading of the upper liquid phase after phase separation is almost zero,while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent,which greatly reduces the energy consumption.This study also investigates the influence of operating parameters such as lean CO_(2)loading,gas and liquid flow rates,CO_(2)partial pressure,and temperature on the volumetric mass transfer coefficient(K_(G)α_(V)).The research shows that K_(G)α_(V) increases with increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure,while the inert gas flow rate and temperature have little effect on K_(G)α_(V).In addition,based on the principle of phase change absorption,a predictive equation for the K_(G)α_(V) of MEA-sulfolane in the packed tower was established.The K_(G)α_(V) obtained from the experiment is consistent with the model prediction,and the absolute average deviation(AAD)is 7.8%.
