【作者】 马双忱；

【导师】 赵毅；

【作者基本信息】 华北电力大学（河北） ， 热能工程， 2003， 博士

【摘要】 本文对烟气中二氧化硫污染与控制技术进行了综述，在参考大量文献的基础上，提出了烟气循环流化床脱硫工艺。在实验室建设了较大规模的热态烟气循环流化床脱硫装置，并进行了较系统的实验研究，探讨了各种因素对脱硫效率的影响。本研究工作对深入了解烟气循环流化床脱硫过程的反应特性，寻求高效的脱硫吸收剂等有重要意义。实验系统设计的循环流化床具有内循环与外循环结合的优点，具有独特的内部结构与型式。首次在循环流化床上进行了高活性吸收剂的脱硫实验研究，研究表明，在最佳工况下可达到90%的脱硫效率。实验结果表明，运行温度和烟气湿度是影响脱硫效率的主要因素。 论文对高活性吸收剂的制备机理进行了较详尽的分析，认为粉煤灰充当消石灰载体以及消化后吸收剂独特的表面特性对脱硫有重要意义。采用扫描电镜对未消化的粉煤灰颗粒、加石灰消化后的粉煤灰颗粒以及脱硫后的粉煤灰分别进行了拍片处理，从微观结构上证实了消化后活性吸收剂结构上的变化。论文对烟气循环流化床脱硫的机理进行了较深入的研究，认为吸收过程是脱硫的主要过程，吸附对脱硫的贡献较少。同时，流化床内部的特殊过程，如物料循环、床内磨损、水的蒸发等都对脱硫产生重要影响。首次提出了考虑到流化床内中心区气固流上升和环壁区物料返混的流化床脱硫数学模型，并提出了模型的12点假设。通过对循环流化床脱硫过程的模型推导，得出了循环流化床脱硫效率模型，并进行了编程计算，计算结果与实验符合较好。运行结果表明本装置运行可靠，工艺简单，投资成本和运行费用低.本论文的研究工作，为开发适合我国国情的烟气脱硫装置提供了理论参考和实践经验。更多还原

【Abstract】 A review on pollution and control for SO2 in flue gas is carried out in the dissertation, CFB FGD process is brought forward on the base of large number of literatures. CFB FGD installation was built in the laboratory and experimental studies were carried through systemically, influences on desulfurization efficiency of all factors were discussed. The study works have important signification to deeply understand the reacting feature of CFB FGD and seek absorbent with high desulfurization efficiency. CFB FGD designed in the laboratory is provided with the advantage of combinedinner and outer circulation，and special interior structure and type.Highly active absorbent is used in CFB FGD firstly，90% desulfurization efficiency can be achieved under optimum operating conditions. Experimental results show that operation temperature and flue gas humidity are the important parameter affecting the desulfurization efficiency.Preparation mechanism of highly active sorbent is analyzed in detail, think that fly ash as carrier of lime and unique surface characteristic of highly active sorbent have important meaning for desulfurization .Fly ash with lime hydration, fly ash without hydration and fly ash after desulfurization are taken pictures by SEM,，the changes of structure of active sorbent after hydration are approved from micro-structure.The study on mechanism of CFB FGD is carried out in the dissertation, think that absorption is main process for desulfurization, but adsorption has little contribution to desulfurization. At the same time special processes of inside CFB, such as material circulation, abrasion of inside CFB, water evaporation and so on have great influence on desulfurization.Upward flow of gas and solids in the core and the backmixing of material in the annulus are taken into account in the model, twelve hypothesizes are put forward to establish the mass transferring model.The efficiency model of CFB FGD is achieved through theoretic deduction, and the theoretical desulfurization efficiency is calculated. The theoretical results accord with the experimental results well. Operation results show that the installation is reliable and simple with low invest and running cost, study works of the dissertation provide theoretical references and practice experiences for FGD fitted the situation of our country.更多还原