用于泡沫混凝土制备的静态混合器模拟研究  

Simulation Study on Static Mixer for Foamed Concrete Preparation

作　　者：郑伍魁 赵悦瑶 王雅晨 李辉[1] ZHENG Wukui;ZHAO Yueyao;WANG Yachen;LI Hui(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《材料导报》2024年第15期152-159,共8页Materials Reports

基　　金：国家重点研发计划(2021YFB3802000,2021YFB3802002)。

摘　　要：泡沫混凝土作为新兴的轻质绿色建材近10年来发展迅速,具有广阔的应用前景。在泡沫混凝土的制备工艺中,浆体搅拌与泡沫混合环节是决定泡沫混凝土性能的关键因素。但“重发泡,轻混泡”的问题长久存在,混泡工艺的理论研究和设备发展都有所欠缺。因此,设计一种符合泡沫混凝土物料性能,能够实现连续化高效生产的专用混合器非常必要。本工作综合考虑混合器的特性,选用静态混合器作为泡沫混凝土的混合装置,采用数值模拟的方法对泡沫浆体混合过程进行仿真计算,建立不同结构参数下的静态混合器三维实体模型,分别通过仿真模拟研究元件个数、管道内径、元件夹角和加料口位置等不同参数对水泥浆体和泡沫混合情况的影响。结果表明,当元件的切割作用与流体分布垂直时,更有利于混合;混合器的管内径越小,混合速度越快,密度分布越均匀,但同时设备耗能更高;元件数量与最终产品的混合效果呈正相关;加料管口与混合元件的距离越小,越有利于均匀混合。综上所述,在θ=90°、D=60 mm、n=10、L=20 mm的条件下,最终可以制备出混合均匀、密度为1400 kg/m^(3)的泡沫混凝土。本研究可为新型泡沫混凝土混合装置的研发提供参考和支持。As an emerging lightweight green building material,foamed concrete has developed rapidly in the past ten years,and has a relatively wide application prospect.In the preparation process of foamed concrete,the mixing of slurry and foam is the key to determine the product performance.However,there are too much attention paid to the foaming process,but not to the mixing process,thus the theoretical research and equipment development of the mixing process are lacking.Therefore,it is necessary to create a special mixer that meets the performance of foamed concrete materials and realizes continuous and efficient production.Considering the characteristics of mixers comprehensively,static mixer has been researched in this work.The numerical simulation was carried out for the mixing process of foam slurry,and a three-dimensional model was established.By simulating the mixing of cement slurry and foam with different parameters,the number of components,the inner diameter of the pipe,the angle of the components and the position of the feeding port were studied respectively.The results showed that when the cutting action of the components is perpendicular to the fluid distribution,the more conducive to mixing;the smaller the inner diameter of the mixer tube,the faster the mixing speed,the more uniform of the density distribution,but simultaneously,the energy consumption of the equipment is higher.The number of components is positively related to the mixing effect of the final product.The smaller the distance between the feeding port and the mixing element,the better for uniform mixing.To sum up,under the optimal conditions ofθ=90°,D=60 mm,n=10,L=20 mm,foamed concrete with uniform mixing and density of 1400 kg/m^(3)can be finally prepared.This research provides the theoretical support for the research and development of a new type mixing device for foamed concrete.

关 键 词：静态混合器 泡沫混凝土 数值模拟 多相流动 

分 类 号：TU5[建筑科学—建筑技术科学]