【作者】 彭朝辉；

【导师】 童志权；

【作者基本信息】 湘潭大学 ， 环境工程， 2001， 硕士

【摘要】 本文是针对目前国内应用最为广泛的石灰湿法脱硫存在的设备易结垢和堵塞问题而进行的亚硫酸钙脱硫法的研究。其实质是以全钙基物质为脱硫剂的新型间接石灰法，它不象“双碱法”、“碱式硫酸铝法”等间接石灰法那样消耗钠或铝。因此该法能连续、稳定、高效率、低费用地脱硫。课题旨在从理论上解释、实践上解决石灰湿法脱硫过程中设备结垢的问题，以期促进国内烟气湿法脱硫的发展。 笔者导师较早前在国内外首次进行了不同pH值下石灰湿法脱硫反应机理的研究，指出pH值不同时，脱硫的主要反应是不同的，在此基础上提出了亚硫酸钙脱硫法。本项研究进一步深入研究了不同pH值下石灰湿法脱硫的反应机理，并通过单因素实验，探讨了影响这种新方法脱硫效率的各项因素，确定了适宜的操作条件，并对大量的实验数据进行综合分析，建立了亚硫酸钙脱硫效率的预测模型，可供脱硫工程设计和脱硫效率预测参考。在适宜的操作条件下进行的中试结果表明，亚硫酸钙悬浮液脱硫效率可达87％以上，排气中SO₂可以达到国家排放标准。 同时本项研究在国内外首次测定了作为亚硫酸钙脱硫法中间产物的亚硫酸氢钙的饱和浓度（30℃时的饱和浓度为0.6126mol/L）及不同温度和浓度下的分解性能，建立了分解温度与对应浓度的函数关联式，具有一定理论和实际意义，为亚硫酸钙脱硫法的实际应用提供了理论依据和重要设计参数。 本项研究还考察了影响CaSO₃·1/2H₂O氧化反应的多种因素，结果表明pH值是影响CaSO₃·1/2H₂O氧化反应的最主要因素，反应温度对氧化率的影响仅次于pH值，在实验确定的适宜操作条件下，氧化率可达96％以上。连续运行时，氧化塔内物料始终处于高氧化率状态，几乎没有HSO₃^-分解副反应发生，可以实现工业化。更多还原

【Abstract】 AbstractAiming for the scaling problem lying in wet desulfuriZation withlime slurry which has been widely aPplied, a method ofdesulfuriZation with calcium sulfite is stUdied. The method can insuredesulfuriZation system to be run economically and teliab1y, which isa novel indirect lime-method with Ca-contalned material asdesulfuriZation agent. Our research aims at theoretica1ly andpractically solving the scaling problems and pushing wetdesulfuriZation to be developed in our countryReaction mechanism of lime wet desulfuriZation under varyingthe value of pH has been studied by Penman teacher for the first timebefore. The exPerirnental results show that main reactions duringdesulfuriZation are different under varying the value of pH. Based onthe study, a method of calcium sulfite desulfurization is put forward,and reaction mechanism is thorough studied in the paPeL via singlefactof, the effectS of different conditions on desulfuriZaion efficiencywith the new method are probed into, and the optdrim conditions areobtained. On the basis of many exPeriment datu, a math model israised, Which is a reference for engineering design and predictingdesulfuriZaion efficiency. The pilot-plant exPerimefltal results showthat desulfurization efficiency can be over 87% under the optimumconditions.The saforation concentration (0.6126 moljL under thetempertae of 30C) and decomPose caPability of calcium bisulfiteunder different temPeratUre and concentration are studied for the firsttime, and a math model is developed correlating decomPosedtemPerthee and correspondence concentration, which providetheoretic basis and imPortan design parameter for having beenaPplied method of calcium sulfite desulhozation in industryMoreover, the study on the effects of different conditions on calcium sulfite oxidation reaction is carried out, and the experimental results indicate that the value of p1-I and reaction temperature are the most principal factors. Under the optimum conditions, the oxidation efficiency is more than 96%. When keeping on operating, the concentration of calcium sulfite is lower in oxidation tower and no decompose side reaction of HSO7 begets. So the craft may be industrialized.更多还原