DEVELOPMENT OF CONSTRUCTION AND DETERMINATION OF GEOMETRICAL PARAMETERS OF THE NET CORRUGATED SHEATH PREVENTING DESTRUCTION OF THE FILTERING ELEMENT OF CYLINDRICAL GAS FILTERS
Background Scientifically grounded methods of preventing destruction of the natural gas filtering elements are absent in current gas practice. Unsolved also is the problem of catching of big solid particles which are in the natural gas stream at the intake of a filter element. These drawbacks of existing protective constructions of filtering elements require that the actions on their elimination be developed. Aims and Objectives Development of construction and determination of geometrical parameters of the net corrugated sheath preventing destruction of the filter element of cylindrical gas filters. Results Authors offered a construction to prevent deformation and destruction of filtering element by forming on side surfaces of external and internal protective cylindrical sheaths parallel to the axis of one-type longitudinal corrugations uniformly distributed over their cylindrical surface. The external and internal net-type sheaths are located in relation to each other at the distance specified by the thickness of mesh of filter element, so that to form a three-layer structure. Moreover, external and internal cylindrical sheaths are made from a metallic net with the mesh size less than maximal size of solid particles in the natural gas. The use of the offered construction allows to prevent deformation and destruction of the filtering element by the wreckages of metallic constructions and large solid particles, and, thereby, to improve safety of its operation and increase the extent of catching big solid factions. In this case it becomes possible to catch additionally large solid particles in the holes of external cylindrical sheath and narrow gap between the sheath and the filtering element. To identify basic parameters of protective cylindrical sheath, formulas are obtained for determining the amount of corrugations in one sheath, the area of the sheath and the factor of its form, showing how many times the outer diameter of shell is more than the height of one of the corrugations. Knowing these parameters it is possible to determine the maximal size of surface of the protective sheaths and filter element for the set type of cylindrical filter, depending on the values of the form factor and the number of corrugations.