Patent ID: 11872507
Assignee: BOLLFILTER NORDIC APS
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 19:
20. A method for operating a filter candle arranged in a backflush filter housing, the filter candle having a cylindrical filter wall which encloses an interior of the filter candle and which is formed by a filter medium, the filter candle including a flushing element arranged in the interior of the filter candle and being rotatable about a central axis of the filter candle, the flushing element being divided into a flushing section provided with at least one flushing port for backflushing part of the cylindrical filter wall and a turbine section provided with a turbine for rotating the flushing element, the flushing section and the turbine section being connected at a transition position, the method comprising:
during normal operation of the filter candle, providing fluid to be filtered to flow through at least one end of the filter candle to the interior of the filter candle and through the filter medium to an outside of the filter candle;
during backflushing operation of the filter candle, causing already filtered fluid to flow from the outside of the filter candle, through at least part of the filter medium, through the at least one flushing port of the flushing section, through the interior of the flushing element, out through an end of the filter candle and out through a flushing outlet of the backflush filter housing; and
during backflushing operation of the filter candle, driving the turbine by means of at least part of the fluid flowing to the flushing outlet, thereby rotating the flushing element, wherein
an outside of the flushing element forms a cylindrical restriction at the transition position, and
during backflushing operation, fluid flow from the flushing section to the turbine section of the flushing element is being restricted between the cylindrical restriction and an inside of the cylindrical filter wall to such an extent that the part of the cylindrical filter wall of the filter candle extending at the turbine section is being backflushed by means of fluid also driving the turbine.