Method of cleaning a filter unit, and a filter unit for filtering gas
AssigneeNiro A/S
InventorsPoul Bach, Henning Birger M.o slashed.ller, Nicolai Pipper
Life of this patent
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Abstract
A filter unit (1) has a plurality of filter elements (7) extending from a plate (6, 32) which divides the unit into a lower inlet side (9) for gas carrying product and an upper outlet side (8) for filtered clean gas. A cleaning-in-place of the filter elements is performed by supplying cleaning liquid in a sequence of several separate liquid pulses which are mixed with the pressurized gas pulses. The ejection of the individual pulse of pressurized gas is initiated at the earliest simultaneously with or after initiation of ejection of the corresponding pulse of cleaning liquid.
Claims23
A method of cleaning a filter unit of the type comprising a plurality of filter elements extending from a plate dividing the unit into a lower inlet side for gas carrying product and an upper outlet side for filtered gas, wherein during a cleaning-in-place of the filter elements in between periods of operation of the filter unit a cleaning liquid is supplied in a sequence of several separate liquid pulses which are mixed with pulses of pressurized gas into common pulses of gas and cleaning liquid by initiating the ejection of the individual pulse of pressurized gas at the earliest time period, simultaneously with or after initiation of ejection of the corresponding pulse of cleaning liquid, wherein each pulse of cleaning liquid has an ejection duration of the most 5 seconds.
A method of cleaning a filter unit of the type comprising a plurality of filter elements extending from a plate dividing the unit into a lower inlet side for gas carrying product and an upper outlet side for filtered gas, wherein during cleaning-in-place of the filter elements in between periods of operation of the filter unit a cleaning liquid is supplied in a sequence of several separate liquid pulses, and pulses of pressurized gas are supplied, each of said separate liquid pulses being of less than 0.5 liter, said separate liquid pulses supplied to the filter elements during a complete cleaning-in-place operation adding up to an aggregate amount of cleaning liquid of at the most 5 liters per square meter of cleaned filter wall surface.
Dependencies are inferred from the claim text.