Purification of tar containing gas streams
AssigneeMeva Energy AB
InventorMattias Kindstrand
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Abstract
The present invention relates to a method for purifying a tar containing gas stream. The method comprises the steps of: a) contacting a tar containing gas stream with a washing liquid in a washing unit to obtain a tar containing washing liquid and a purified gas stream; b) adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid; c) cooling the extraction liquid; d) after cooling, separating the tar containing extractant from the regenerated washing liquid, and e) recirculating the regenerated washing liquid to the washing unit.
Claims20
A method for purifying a tar containing gas stream, the method comprising the steps of:
- a) contacting a tar containing gas stream with a washing liquid in a washing unit to obtain a tar containing washing liquid and a purified gas stream;
- b) adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid;
- c) cooling the extraction liquid using a plate heat exchanger;
- d) after cooling, separating the tar containing extractant from the regenerated washing liquid, and
- e) recirculating the regenerated washing liquid to the washing unit.
A system (1) for purifying a tar containing gas stream, the system comprising:
- a washing unit (10) for contacting the tar containing gas stream with a washing liquid to obtain a tar containing washing liquid and a purified gas stream;
- adding means (20, 34) for adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid;
- a pump (80) for providing the extractant to the tar containing washing liquid during high pressure;
- an extraction unit (30) for extracting and preferably separating the tar containing extractant from the regenerated washing liquid,
- a cooling unit (90), being a plate heat exchanger configured to receive and cool the extraction liquid, the cooling unit being arranged upstream of the extraction unit (30) or in the extraction unit (30)
- a first duct (40) for supplying the tar containing washing liquid from the washing unit (10) to the extraction unit (30), and
- a second duct (50) for supplying the regenerated washing liquid from the extraction unit (30) back to the washing unit (10),
- wherein the adding means (20) are arranged downstream the washing unit (10) and upstream the cooling unit (90) to add the extractant to the tar containing washing liquid in the first duct (40), and/or in the extraction unit (30).
Dependencies are inferred from the claim text.