【作者】 王慧；

【导师】 宗润宽；

【作者基本信息】 天津大学 ， 化工过程机械， 2004， 硕士

【摘要】 干法、半干法烟气脱硫工艺与传统的湿法烟气脱硫工艺相比具有投资费用低、能耗小、脱硫产物为干态、易于处理等优点。本文通过阅读大量的文献发现：吸收剂利用率低是限制干法、半干法烟气脱硫应用的重要原因。因此提高石灰的利用率是完善干法、半干法烟气脱硫技术并使其具有经济性上的竞争力关键技术之一。本文首先利用飞灰和Ca(OH)2经水合反应制取钙基吸收剂，并测定吸收剂样品的比表面积。水合后吸收剂比表面积大约是飞灰及纯Ca(OH)2比表面积之和的四倍。得出影响水合吸收剂比表面积大小的因素按影响程度大小依次是：水合时间，水固比，飞灰/Ca(OH)2比，飞灰来源，他们都有一个最佳值。其中水合时间影响最大。然后对吸收剂样品进行脱硫实验，检验样品的Ca(OH)2利用率和反应速率。结果得出：经过飞灰和Ca(OH)2水合反应的吸收剂比表面积对吸收剂性能有很大的影响。比表面积越大，吸收速率越高，同时Ca(OH)2的利用率也得到很大的提高。更多还原

【Abstract】 More recently, dry and semi-dry gas desulfurization techniques using finely divided lime slurry as for SO2 have drawn increasing interest. These dry and semi-dry FGD techniques are projected to have lower capital and operating costs than the conventional wet FGD techniques. Further more, the waste product is dry powder rather than wet sludge. This offers potential advantages in the areas of waste handling and disposal. Through reading large numbers literature this article find that the higher operating costs incurred due to poor sorbent utilization may make them uneconomical for application to application. With these factors in mind, current technologies of dry and semi-dry flue gas desulfurization are reviewed while focus on increasing the utilization of the calsium-based sorbents. Thus they will have the competition on the economy. In this article, the first, fly ash was slurried with Ca(OH)2 at elevated temperature to produce reactive calcium sorbents for flue gas desulfurization and mensurate the surface area of the sorbent. The surface area of the sorbent is about as four times as high the arithmeticals addition of surface areas of initial solids before hydration. The relative surface area in relation to the hydration condition (time, water/solids ratio, fly ash/ Ca(OH)2 ratio) and the source of fly ash. The hydration time effect is the most important. And the hydration time has an optimal value. The second, the sorbent was used in the simulated flue gas desulfurization to verify the utilization of Ca(OH)2 and the velocity of the reaction. The result revealed that the surface area increment of the hydrated sorbents have great effect on the desulfurization. The greater the surface area, the higher the speed of the desulfurization as well as the utilization of Ca(OH)2.更多还原