【作者】 任强；

【导师】 刘建忠； 周俊虎；

【作者基本信息】 浙江大学 ， 工程热物理， 2006， 硕士

【摘要】 二氧化硫是造成大气污染的主要污染物，而燃煤的二氧化硫排放则是大气二氧化硫污染的主要来源。控制燃煤二氧化硫的排放已经势在必行。虽然钙基吸收剂有着诸多优势，同时也已经广泛地应用于燃煤脱硫技术，但其脱硫效果有限，造成该技术不能满足高标准的脱硫要求，也限制了它的良好发展趋势。得益于新材料的发展，我们采用纳米碳酸钙作为脱硫添加剂，对纳米碳酸钙燃烧脱硫效果进行了系统的试验研究和理论分析。这对开辟燃烧脱硫技术的研究新途径有着深远的意义。 本文首先介绍了我国大气二氧化硫污染的现状以及污染的原因；同时综述了国内外脱硫技术的开发应用的情况，和纳米碳酸钙发展状况。并通过与我国污染物排放控制标准相结合给出了文章的研究目的、内容和意义。 其次，文章介绍了纳米碳酸钙制备工艺流程，以及各主要指标的测定方法，同时我们也测定了部分与燃烧脱硫相关的指标，并分析其微观结构。然后我们通过试验研究了燃煤硫份析出动态特性，和纳米碳酸钙燃烧脱硫效果。对其几个主要的影响因素通过试验测定并进行了理论分析。 再次，我们以热重分析实验为基础，对纳米碳酸钙的热分解动力学特性进行了多个模型下的计算。验证了纳米碳酸钙热分解方面所具有的优势。 最后，我们对纳米碳酸钙的煅烧产物的活性度进行了测定。得到纳米碳酸钙在脱硫反应的第二阶段中具有优势的实验依据。更多还原

【Abstract】 SO₂ is the main contamination causing air pollution, and the releasing of SO₂ during coal combustion is the main source of pollution. It is very imperative to control the releasing of SO₂ during coal combustion. Although there are many advantages and it has been extensively used, the desulphurization effect of calcium-based sorbent is very limited. So the technique doesn’t satisfy the demand for high quality desulphurization. Profit from the development of new material, we adopt nano-CaCO₃ as additive to research its desulphurization effect, which has an important effect on research on desulphurization.The paper first introduces the actuality of SO₂ pollution and its reason in China. Meanwhile, it summarizes the condition of exploiture of desulphurization and the development of CaCO₃. Then, combined with the controlling criterion on the releasing of contamination, we offer the intention、content and meaning of the research.. Secondly, the paper presents the flow of producing nano-CaCO₃ and methods for measuring main indexes. We also determine some indexes related to desulphurization, and analyze the micromechanism of them. Then, we research the dynamic characteristic of sulfur releasing during coal combustion and the effect of desulphurization by using nano-CaCO₃. What’s more, we give a theoretical interpretation on it。Thirdly, on the basis of Thermal Gravimetric experiment, we calculate the characteristics of Thermolytic Kinetics of nano-CaCO₃ for several models, which gives proof for nano-CaCO₃’ advantage on thermal decomposition。At last, we measure the activity of nano-CaCO₃ after calcining. Our conclusion is nano-CaCO₃ has outstanding advantage during the second stage of desulphurization.更多还原