Investigation into the parameters of influence on dust cake porosity in hot gas filtration

• Published in: Powder technology Vol. 264; pp. 592 - 598
• Main Authors: Lupion, M., Rodriguez-Galan, M., Alonso-Fariñas, B., Gutierrez Ortiz, F.J.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2014; Elsevier
• Subjects: Applied sciences; Bag filters; Cake dust porosity; Ceramic filters; Chemical engineering; cost effectiveness; dust; equations; Exact sciences and technology; filters; Filtration; Hot gas filtration; Hydrodynamics of contact apparatus; Liquid-liquid and fluid-solid mechanical separations; Miscellaneous; porosity; powders; Solid-solid systems; temperature; Cake dust porosity; Ceramic filters; Bag filters; Hot gas filtration; Correlation; Filtration; Hydrodynamics; Compaction; Empirical model; Operating conditions; Dust; Correlation analysis; Pressure drop; Bag filter; Coal; Hot gas; Semiempirical method; Porosity; Ceramic materials
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2014.05.042

The development of robust and cost-effective hot gas filtration technologies is crucial to facilitate the implementation of advanced coal-based power systems. Understanding the structural characteristics of the dust cake, such as porosity, in relation to the pressure drop evolution is a subject of interest to improve the filtration process. This paper focuses on the study of dust cake compaction and its influence on cake porosity. A semi-empirical model based on Kozeny–Carman equation has been applied to experimental data from the operation of four types of commercial filters (two bag filters and two rigid filters) in a hot gas filtration experimental facility. The method proposed calculates the cake porosity from the specific dust cake resistance coefficient and dust properties. Cake porosity values obtained have been analysed to determine the effect of the operating parameters (filtration velocity, temperature and filtering media). Results show that filtration velocity is the variable that most affects the dust cake porosity. In addition, a correlation between filtration velocity and dust cake porosity has been established. [Display omitted] •A large scale high temperature filtration facility operating commercial filters•Semi-empirical model based on Kozeny–Carman equation and experimental data•Dust cake resistance dependence with operational parameters•Relationship between dust cake porosity and filtration velocity