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1. (WO2017036801) METHOD FOR FILTERING SEAWATER ONBOARD A SHIP

Pub. No.:    WO/2017/036801    International Application No.:    PCT/EP2016/069529
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 18 01:59:59 CEST 2016
IPC: B01D 35/157
B01D 35/147
B01D 29/11
B01D 29/60
B63J 4/00
C02F 1/00
Applicants: GEA MECHANICAL EQUIPMENT GMBH
Inventors: KLOMFAS, Peter
SIMS, Heiko
Title: METHOD FOR FILTERING SEAWATER ONBOARD A SHIP
Abstract:
A method for filtering seawater onboard a ship, with a filtration device (2) that has an in particular cylindrical filter element (6) arranged in a tank (5), and a cleaning device for separating dirt from the filter element (6) and for carrying away a dirt concentrate phase, consisting of water and the dirt, from the filter element (6) and out of the filtration device (2); having the following steps: a) seawater is pumped into the filtration device (2); b) the seawater is introduced into the filtration device (2) at an inlet pressure P_ein, flows in the filtration device (2) through the filter element (6), and after the filter element (6) as filtered seawater – filtrate – has an outlet pressure P_aus; c) a concentrate phase – concentrate – which is removed using the cleaning device (11) at the filter element (6) of the filtration device (2) and is carried away from the filter element (6) has a concentrate pressure P_konz; d) the inlet pressure P_ein, the outlet pressure P_aus and the concentrate pressure P_konz are preferably measured using sensors (22, 23, 24) and are transmitted to a control device (21); e) a change in filter efficiency of the filter element (6) is recognized by determining a change in a contamination pressure difference ∆PF= P_ein – P_aus between the inlet pressure P_ein and the outlet pressure P_aus; and/or f) a suction pressure difference ∆PK= P_aus – P_konz defined as the difference between the outlet pressure and the concentrate pressure is controlled in dependence on the contamination pressure difference ∆PF = P_ein – P_aus.