【作者】 唐晓佳；

【导师】 朱益民；

【作者基本信息】 大连海事大学 ， 环境科学， 2014， 博士

【摘要】 为了使镁基废气脱硫系统适用于船舶,本文在已建立的镁基船舶废气脱硫试用装置基础上,进行了优化研究。通过实船试验及对比分析,优选脱硫方法,总体确定船舶适用的废气脱硫方法；通过文献调研和理论计算优化设计并改造船舶废气镁基脱硫试用系统；通过统计软件建立镁基-海水法船舶废气脱硫系统的脱硫效率模型,并用于指导船舶废气脱硫系统运行；研究氧化镁高效水化制备氢氧化镁机理,并建立实船应用规模的氧化镁连续高效水化制备氢氧化镁装置；连续运行优化改造后的镁基-海水法船舶废气脱硫试用系统,实船验证镁基脱硫技术的适用性。首先,实船试验并对比分析了镁法、海水法、镁基-海水法的废气脱硫效果,认为镁基-海水法因具有脱硫效率高、废水量少、不消耗淡水资源等特点,适用于船舶废气脱硫。以获得高效、低阻、适于船舶应用的废气脱硫系统。通过文献调研和理论计算,对脱硫塔的塔型、进风方式、喷淋系统和除雾系统进行全面优化改造。利用Minitab15软件进行响应面设计,获得镁基-海水法船舶废气脱硫系统的脱硫效率模型,方差分析和试验证明模型可靠,设计范围内可用于指导装置运行。传统的氧化镁水化制浆系统(液-固)具有水化率低,占地面积大等缺点,不适用于船舶。因此本文提出了一种高效的氧化镁水化制备氢氧化镁的方式,并研究其机理。研究表明,气-液-固反应方式能高效制备氢氧化镁。在海水体系中,获得的水化产物流动性好,杂质被氢氧化镁包裹,不易堵塞管道。最后,建成氧化镁连续高效制备氢氧化镁装置,结合已优化改造完成的脱硫塔,在脱硫效率模型指导下连续运行镁基-海水法船舶废气脱硫试用系统。试验结果表明,优化后镁基-海水法船舶废气脱硫系统具有脱硫效率高、系统阻力低、系统稳定性好等特点,适用于船舶废气脱硫。更多还原

【Abstract】 In order to enable magnesium-base flue gas desulphurization system to be applicable to marine exhaust gases, an optimization study was carried out based on an established marine exhaust gases scrubber. Through experiment contrasts, the applicative desulphurization method was determined. The desulphurization tower was designed optimally based on the results of literature researches and theoretical computations, and corresponding modifications were carried out. A desulphurization efficiency model of magnesium-base seawater scrubber was created by statistical software. And the reliability of the model was verified. The mechanism of a novel hydration reaction was investigated experimentally. And then a high effective and continuous MgO hydration unit was established. Finally, the applicability of magnesium-base seawater desulphurization system for. marine exhaust gases was test onboard.First of all, a study to compare three desulphurization methods including seawater, magnesium and magnesium-base seawater was carried out. The results show that the magnesium-base seawater method has characteristics of high desulphurization efficiency, limited volume of wastewater and no consumption of fresh water. Therefore, it could be concluded that the magnesium-base seawater method is suitable for marine exhaust gases desulphurization.In order to fulfill the requirement of high effective and low pressure drop, optimizing design and reforming of desulphurization tower were conducted to make it suitable for marine exhaust treatment. After literature researches and theoretical computations, comprehensive optimization of the tower type, gas induced way, spray system and mist elimination system were carried out. A response surface model was created by Minitab15software to predicate the desulphurization efficiency of magnesium-base seawater system. The analysis of variance and experimental test results verified that the model was reliable and could be used to navigate the design space.Traditional MgO hydration system (liquid-solid) has the shortages such as large occupied and low hydration efficiency, which restrict its application in marine scrubber area. Therefore, a novel and high effective hydration method was put forward and the mechanism was investigated. The results of study indicated that the hydration efficiency of gas-liquid-solid reaction system was promoted significantly than liquid-solid system. Within the seawater, the hydration product of gas-liquid-solid reaction system has good fluidity and the impurity was covered by the hydration product, which mean free of clogging.Eventually, the combination of high effective and continuous MgO hydration unit and the modified desulphurization tower constituted the magnesium-base seawater marine exhaust gases desulphurization system. The system was operated under the guide of desulphurization model. The results of continuous test showed that the system has the characteristic of high desulphurization efficiency, low pressure drop, good stability. It could be concluded that the magnesium-base seawater desulphurization system applied to marine exhaust gases treatment.更多还原