在天然砂资源有限和环保大环境下,机制砂高性能混凝土已经普遍应用.笔者就机制砂中石粉含量对硫铝酸盐水泥基高性能混凝土耐久性能影响进行研究,主要研究不同石粉含量对硫铝酸盐水泥基混凝土耐久性能(抗冻性和抗渗性等性能)的影响.研究表明:随着机制砂中石粉含量的增加,其硫铝酸盐水泥基高性能混凝土抗冻性能逐渐增强,且掺量越高增强越明显;其硫铝酸盐水泥基高性能混凝土抗渗性能逐渐提高,且掺量越高提高越明显.
1 水泥磨选粉机的控制现状 水泥磨选粉机的作用是对水泥磨研磨后的熟料颗粒进行打散、分级、筛分,将符合成品要求的水泥颗粒输送出来,没有达到成品要求的水泥颗粒被重新返送回磨机进行再次粉磨.水泥磨选粉机在水泥生产过程中有着及其重要的作用,是整个水泥生产链的最后环节,是把控水泥质量的最后一道保障,直接关系到水泥成品的质量.
In order to improve the design quality,after comparing various 3D design software,in response to the design difficulties of ce-ment kiln waste heat recovery engineering,3D design software such as PLANT 3D and Solidworks are mainly used for the design of ce-ment production line waste heat recovery engineering.Based on specific engineering applications,specific implementation methods are introduced for the three process sub items of waste heat boilers,waste heat power plants,and plant steam and hot water pipelines,great-ly improving design accuracy and efficiency.
Developing a"five stage+"series-parallel coupling reconstruction heat transfer technology using the principle of high solid-gas ratio and achieving engineering application,reducing the outlet temperature of the preheater by 20～50 ℃,has a significant effect on improving the heat transfer efficiency of the preheater.The relatively low cost of system transformation makes it impossible to upgrade the original design tower to a six stage five stage dual series suspension preheater due to factors such as insufficient load margin,which further improves the efficiency of raw material heat exchange and reduces the temperature of exhaust gas,thus achieving the goal of en-ergy conservation and carbon reduction.
