Filter apparatus and a method of cleaning filter elements thereof

A method of cleaning substantially horizontal filter elements having a common vertical axis and provided with a filtering material upon an upper surface of which a cake is deposited during a filtering process and a closed lower surface, the method comprising the steps of providing nozzle elements having a further common vertical axis and horizontal arms located above the upper surface of the filtering material of the filter elements;

• supplying a cleaning medium through and ejecting the cleaning medium from said nozzle elements to said surfaces from above so as to erode the cake deposited thereon;
• rotating said filter elements about said first-mentioned axis during ejecting of the cleaning medium toward said upper surface under a desired elevated pressure;
• turning said nozzle elements about said further axis relative to the surface during supplying of the cleaning medium toward the surface;
• and applying to said cleaning medium an adjustable elevated pressure so that said cleaning medium exits from said nozzle elements at a pressure between substantially 5 and 100 bar, whereby the cake is removed from said surface and the filtering material of the filter elements is cleaned.

A method of cleaning substantially horizontal filter elements having a common vertical axis and provided with a filter material upon an upper surface of which a cake is deposited during a filtering process, the method comprising the steps of providing nozzle elements having a further common vertical axis and located above the upper surface of the filtering material of the filter elements;

• supplying a cleaning medium to said nozzle elements;
• ejecting the cleaning medium from said nozzle elements at an adjustable elevated pressure towards said upper surface from above downwardly and in a central region of said filter elements which is close to the common vertical axis of the latter;
• rotating said filter elements about said first-mentioned axis during ejecting of the cleaning medium towards said upper surface under a desired elevated pressure so that the cake is removed in direction from the central region of said filter elements outwardly to a periphery of the latter under the action of a centrifugal force;
• and turning the nozzle elements about said further axis relative to said upper surface during ejecting the cleaning medium towards said upper surface so that during the rotation and turning the entire upper surface is overlapped and thereby full removal of the cake from said surfaces and thereupon also full cleaning of the filter material of the filter elements are guaranteed.