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US 11,939,249 B2Granted
Microwave assisted pyrolysis and gasification
AssigneePrototech Company
InventorsArild Vik, Crina Silvia Ilea
Life of this patent
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Abstract
A method and system for converting an aqueous salt containing sludge into gases and a solid residue is described. The sludge is pyrolyzed and gasified with the assistance of microwave radiation.
Claims16
A method for continuous large scale converting an aqueous salt containing sludge from a marine fish farm into gases and a solid residue, comprising the steps of:
- dewatering the aqueous salt containing sludge to a water content of 20-60% (weight/weight);
- heating the dewatered sludge to a temperature of 500° C. to 700° C. by microwave radiation, thereby generating heat and steam;
- partially or completely pyrolyzing the heated dewatered sludge to produce pyrolysis products, wherein the pyrolysis products comprise CO gas, CH4 gas and H2 gas, CHO oil and solid C;
- gasifying the pyrolysis products, wherein the solid C, H2 gas and CHO oil are gasified to CO gas and H2 gas, wherein
- the steps of pyrolysis and gasification takes place simultaneously in one reactor, and
- the microwave radiation generates the steam for the gasification reaction by heating the water in the salt containing aqueous sludge.
3 more elements
A method for converting aqueous salt containing sludge generated by sea-based fish farming or recirculating aquaculture systems (RAS) into gases and char using microwave radiation, the method comprising:
- feeding, to a reactor, the aqueous salt containing sludge having a water content of 20-60% (weight/weight);
- and
- subjecting, in the reactor, said sludge to heating at a temperature of 500° C. to 700° C. by microwave radiation, thereby generating heat and steam,
- wherein during the subjecting, the following occurs simultaneously:
- said sludge is partially or completely pyrolyzed in said reactor to produce pyrolysis products, wherein the pyrolysis products comprise CO gas, CH4 gas, H2 gas, CHO oil and solid C;
- and
- said pyrolysis products are gasified with the steam in said reactor to produce CO gas and H2 gas, said steam resulting from microwave radiation heating of the water contained in said sludge.
4 more elements
Dependencies are inferred from the claim text.