摘要
以流固耦合渗流理论为基础 ,建立了关于滤饼渗透性的数学模型 ,指出由试验确定滤饼渗透性归结为在数学上求解微分方程的反问题 ,并给出了试验数据的测试及计算方法。对不同性质的物料及相关操作因素的研究表明 :滤饼渗透性随应变呈指数变化 ,且在滤饼骨部不同高度上其变化程度不同 ;对压缩性较大的物料 ,滤饼变形对渗透性影响较明显 ,实践上可以选择压榨过滤 ,对压缩性较小的物料 ,实践上宜采用流体 (例如压缩空气 )驱赶滤饼孔隙中的残留水分 ,以最大限度地降低滤饼水分 ;物料粒度分布对滤饼渗透性有明显影响。
Based on theory of coupling influent of fluid solid, a methematical model for filter cake′s permeability is established. The authors point out that the cake′s permeability can be estabished by inverse solution of a differential equation, instead of tests, and measuring and calculation methods are given in this paper. From the study on materials of differential natures and their related operational factors, it is indicated that the cake′s permeability should vary as exponent and its changing degrees at different levels within a cake are not the same. Material with a high compressibily should be filted by squeezing, because its cake′s deformation has obvious impact on its permeability, and material with a small permeability should be filted by brushing away residual moisture in cake voids with fluid (for example compressed air) to reduce moisture to the utmost limit. The size distribution also has obvious influence on cuke′s permeability.
出处
《矿冶工程》
CAS
CSCD
北大核心
2000年第3期25-27,30,共4页
Mining and Metallurgical Engineering
基金
国家博士点基金
关键词
渗透率
滤饼
耦合渗流模型
测试方法
permeability
porous medium
coupling influent filtration
