The packed biofilters for gas emissions purification from oil refining ventures
The article presents some new packing design and biological filter arrangement. The mechanism of biological filtration process, which served the basis for the basic requirements formulation to biological filters packing, is described and design specific features of a biological filter are justified. Comparison of packing geometric characteristics is performed. Hydrodynamics of the new packing is discussed. Investigation results of the packing hydraulic resistance, including the packing, overgrown by a biological film, that is maximally coincides with the operational characteristics of the packing, are given in the article. Some specific features of gas flow mode in a packed bed when Reynolds numbers are less than 40 that corresponds to viscous flow mode, characteristic for gas biological purification, are discussed. This data values observed for viscous flow regime, which is typical for biological filtration process. Ergun equation with account of flow viscous mode serves the basis for suggesting methods of head loss calculation in a packed bed as well as reduction of the portion of a packing free volume in connection with biomass formation due to head loss change.