Method and system for cleaning oily waste
AssigneeAlfa Laval Corporate AB
InventorsAnders PALLMAR, Shinya TANEHASHI
Life of this patent
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Abstract
A method for cleaning oily waste including water, solids and at least one fuel oil includes removing water from the oily waste to be cleaned so as to produce dried oily waste; introducing dried oily waste into a two-phase centrifugal separator through a liquid inlet; separating the dried oily waste in the two-phase centrifugal separator into a cleaned oil phase and a sludge phase; discharging the sludge phase through a sludge outlet of the two-phase centrifugal separator, and discharging the cleaned oil phase through a liquid outlet of the two-phase centrifugal separator. A system for cleaning oily waste including water, solids and at least one fuel oil is also disclosed.
Claims20
A method for cleaning oily waste comprising water, solids and at least one fuel oil, wherein the method comprises the steps of:
- providing oily waste to be cleaned, said provided oily waste to be cleaned comprising water, solids and at least one fuel oil;
- removing water from said provided oily waste to be cleaned so as to produce dried oily waste;
- introducing the dried oily waste produced in said step of removing water into a two-phase centrifugal separator through a liquid inlet;
- separating said dried oily waste in said two-phase centrifugal separator into a cleaned oil phase and a sludge phase comprising solids from said dried oily waste;
- discharging said sludge phase through a sludge outlet of said two-phase centrifugal separator, and
- discharging said cleaned oil phase through a liquid outlet of said two-phase centrifugal separator.
A system for cleaning oily waste comprising water, solids and at least one fuel oil, wherein the system comprises:
- at least one fuel oil treatment device for pre-treatment of fuel oil before use in an engine installation on board a ship or in a power plant, each fuel oil treatment device providing fuel oil waste comprising water, solids and at least one fuel oil during use for pre-treatment of fuel oil;
- a water removal tank arranged to receive fuel oil waste provided by said at least one fuel oil treatment device and optionally further waste material provided by one or more other waste sources such that fuel oil waste and optionally further waste material are collected in said water removal tank and thereby form said oily waste to be cleaned, said water removal tank further being arranged to accommodate said formed oily waste to be cleaned, whereby said oily waste to be cleaned comprises water, solids and at least one fuel oil;
- a first transferring arrangement for transferring fuel oil waste from said at least one fuel oil treatment device to said water removal tank and optionally transferring further waste material provided by one or more other waste sources to said water removal tank;
- a water removal arrangement for removing water from said oily waste accommodated in said water removal tank and thereby producing dried oily waste;
- a two-phase centrifugal separator for separation of dried oily waste produced in said water removal tank into a cleaned oil phase and a sludge phase comprising solids from said dried oily waste, whereby the centrifugal separator comprises a liquid inlet for the dried oily waste, a sludge outlet for the sludge phase and a liquid outlet for the cleaned oil phase;
- and
- a second transferring arrangement for transferring dried oily waste from the water removal tank to said liquid inlet of said two-phase centrifugal separator.
Dependencies are inferred from the claim text.