SEAWATER INJECTION CONTROL METHODS AND SYSTEMS

摘要

A control method and system for controlling the operation of a seawater injection system (1) comprising at least one water treatment line in which seawater is forced through one or more coarse filtration unit(s)(2), ultrafiltration unit(s) (3) and at least one of a reverse osmosis unit (4) and/ora nanofiltration unit (5) to a water injection pump(6), and wherein the flowrate required to create differential pressure across membrane(s) (9) of the ultrafiltration unit(s)(3)is obtained by a boosting pump (8). A controller "C" implemented operation control is applied to adjust automatically the outlet pressure and flow of the boosting pump (8)such that an average flowrate through the ultrafiltration units is maintained and determined as boosting pump flow divided by the number (N) of active ultrafiltration units. A proportional-integral-derivative (PID) control mechanism (18) is preferably applied to all adjustable flow/pressureregulating units in the seawater injection system.