海水烟气脱硫及其动力学研究-应用化学专业论文.docxVIP

海水烟气脱硫及其动力学研究 海水烟气脱硫及其动力学研究 摘要 海水烟气脱硫工艺利用海水吸收烟气中的S02，具有技术成熟、工艺简单、 投资省、运行方便等特点，是其它脱硫工艺无法比拟的。海水烟气脱硫能有效控 制燃煤电厂S02的排放，同时削减粉尘的排放量，对改善大气环境质量有着十分 重要的意义。添加Ca(OH)2和白泥等碱性物质得到的增碱度海水可以进一步提高 海水脱除烟气中S02的能力。 本论文首先对人工海水和天然海水脱除烟气中SCh的过程进行了研究，考察 了温度、S02浓度、气体流速和不同阳离子对人工和天然海水S02吸收率的影响。 在此基础上考察了增碱度人工和天然海水中C2(0Ia)2和白泥等碱性物质对脱硫 率的影响，并进一步对人工海水、天然海水和增碱度天然海水吸收S02的动力学 过程进行了研究。得到如下主要结论： 1．人工海水和天然海水对S02的吸收率均随温度升高、气体流速增大、S02浓 度增大而下降的越快。 2．Ca2+、M92+、ICe“、Mn2+四种阳离子对海水吸收S02有一定的影响，但影响 不大。 3．碱性是影响人工和天然海水吸收S02的主要因素，添加Ca(OH)2和白泥后， 增碱度人工和天然海水的pH值有所增加，对SO=的吸收效果也明显提高。 4．人工海水、天然海水、增碱度天然海水吸收S02的反应均近似为一级反应。 5．25-65C范围内，人工海水、天然海水、增碱度天然海水吸收S02的初始速 率r口几乎不受温度的影响。 关键词：海水脱硫；增碱度海水；白泥；动力学 Flue Flue gas desufurization and its kinetics using seawater Abstract The seawater desulphurization is a technic tO absorb S02 in flue gas using seawater．Technically,it is mature，simple and convenient to run，and therefore incomparable with other desulphurization technics．It is efficient to control S02 emission in power plants，and tO reduce dust emission at the same time，which plays all important role in improving the air quality．The addition of Ca(OHh and／or white slurry cart increase the alkalinity of seawater,and hence improve the absorptivity of S02 in flue gas． Desulphurization using artificial and natural seawater was investigated in this thesis．The effects of temperature，flow rate of the flue gas，the concentration of 502 and some cations 011 S02 absorptivity were studied first．On this basis，the effects of addition of Ca(OI-I)2 and white slurry on S02 absorptivity were further studied．And finally,the absorbing kinetics of S02 using artificial seawater,natural seawater and seawater with enhanced alkalinity were examined．The major results and conclusions ale summarized as below： 1．The S02 absorptivity decreases with the increase of temperature，flow rate of flue gas and the concentration of S02． 2．Cations such as Ca2+，M92+，Fe2+and Mn2+have little effect on S02 absorptivity． 3．The alkalinity has significant effect on S02 absorpti