卢忠远-利用电厂余热制备高活性粉煤灰的研究卢忠远-利用电厂余热制备高活性粉煤灰的研究.pdf

利用电厂余热制备高活性粉煤灰的研究 卢忠远，舒朗，严云 (西南科技大学材料科学与工程学院，先进建筑材料四川省重点实验室，四川 绵阳 621002) 摘要 介绍了以火电厂余热过饱和蒸汽为动力的超微粉碎技术及设备，该设备为自主开发，利用超音速过饱 和蒸汽加速粉煤灰颗粒，使其相互碰撞以达到粉碎的目，达到了高效率，低能耗的技术指标。通过对设备 中涡轮选粉机频率的调节，能制备各种微米尺度的粉煤灰超微粉体。粒度分析和 SEM 照片显示，经蒸汽粉 碎，能有效的降低低等级粉煤灰平均粒度，而且粒度分布较窄。性能测试结果表明，细化后的低等级粉煤 灰的火山灰活性有大幅度提高，并具有一定的减水作用；d(0.5)为 10μm 左右磨细灰具有最佳的减水效果， 各项指??均能达到 I 级粉煤灰标准。 关键字 低等级粉煤灰 蒸汽粉碎 活性指数 需水量比 中图分类号:TU521.4 文献标识码:A Prepared High Activity Fly Ash by Residual Heat of Power Plant LU Zhongyuan, SHU Lang, YAN Yun (School of Material Science and Engineering, Southwest University of Science and Technology, Key Laboratory for Advanced Building Materials of Sichuan Province, Mianyang 621002, China) Abstract A technique and equipment developed by ourselves suitable for producing ultra-fine mineral admixtures from the granular wastes, such as coarse fly ash, phosphate slag, etc., which is powered by superheat and ultra saturated steam expelled from the turbine of the electric power plant. In the grinding process, the fly ash is accelerated up to supersonic speed, and then the high speed fly ash grain is collided interactively so that the finer fly ash is gotten. This process has many obvious advantages compared to the conventional techniques, such as high efficiency and low cost. Fly ash of different micron scale could be prepared by adjust the frequency of turbine Classifier. Particle size analysis and SEM shows that the size of fly ash was effective decreased by steam grinding. Furthermore, it has a more narrow grain size distribution. The experimental results show also that fine fly ash has distinct water reducing effects and its latent pozzolanic activity is activated sharply by this grinding process. Fine fly ash of 10μm prepared through this process had water reduced effects optima