Carbonization and dewatering process
AssigneeInstitute of Gas Technology
InventorsWilliam W. Bodle, Francis S. Lau, Michael C. Mensinger
Life of this patent
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Abstract
An energy efficient process for beneficiating and dewatering high water content carbonaceous materials utilizing a pneumatic stream to entrain, transport, dewater and to carbonize organic carbonaceous material in a fluidized bed. The process utilizes physical separation for principal removal of moisture and reduces contact between organic carbonaceous matter and hot process water, thereby retaining a high organic content in the product fuel. The organic carbonaceous materials are chemically beneficiated during carbonization in a fluidized bed contactor. Heat exchange and heat recovery procedures provide an economical, energy efficient process.
Claims18
A process for beneficiating, dewatering and carbonizing high moisture content carbonaceous solids comprising the steps of:
- introducing said carbonaceous solids having a moisture content of about 75 weight percent and less through a pressure feeding means to a pressurized pneumatic transport stream;
- passing said carbonaceous solids in said pneumatic transport stream to a first solids/gas separation means;
- separating said carbonaceous solids from the gas comprising said pneumatic transport stream and passing said separated carbonaceous solids to a fluidized bed carbonization zone within a fluidized bed contactor and passing separated gas comprising said pneumatic transport stream to said fluidized bed to provide fluidizing gas;
- carbonizing said carbonaceous solids in said fluidized bed at elevated temperatures producing carbonized solids;
- withdrawing said carbonized solids and said fluidizing gas from said fluidized bed contactor;
- conveying said carbonized solids in said pneumatic transport stream comprising said fluidizing gas to a second solids/gas separation means, separating said carbonized solids from said conveyed pneumatic transport stream comprising said fluidizing gas and recycling separated gas from said second solids/gas separation means to said pneumatic transport stream upstream of said first solids/gas separation means;
- and
- passing said carbonized solids separated in said second solids/gas separation means to a mechanical dewatering means and mechanically dewatering said carbonized solids in said mechanical dewatering means so as to produce beneficiated, dewatered, carbonized solids product.
A process for beneficiating, dewatering and carbonizing high moisture content carbonaceous solids comprising the steps of:
- mechanically dewatering said high moisture content carbonaceous solids having a moisture content in excess of about 75 weight percent so as to reduce said moisture content of said carbonaceous solids to about 75 weight percent and less;
- introducing said carbonaceous solids having a moisture content of about 75 weight percent and less through a pressure feeding means to a pressurized pneumatic transport stream;
- passing said carbonaceous solids in said pneumatic transport stream to a first solids/gas separation means;
- separating said carbonaceous solids from the gas comprising said pneumatic transport stream and passing said separated carbonaceous solids to a fluidized bed carbonization zone within a fluidized bed contactor and passing separated gas comprising said pneumatic transport stream to said fluidized bed to provide fluidizing gas;
- carbonizing said carbonaceous solids in said fluidized bed at elevated temperatures producing carbonized solids;
- withdrawing said carbonized solids and said fluidizing gas from said fluidized bed contactor;
- conveying said carbonized solids in said pneumatic transport stream comprising said fluidizing gas to a second solids/gas separation means, separating said carbonized solids from said conveyed pneumatic transport stream comprising said fluidizing gas and recycling separated gas from said second solids/gas separation means to said pneumatic transport stream upstream of said first solids/gas separation means;
- and
- passing carbonized solids separated in said second solids/gas separation means to a mechanical dewatering means and mechanically dewatering said carbonized solids in said mechanical dewatering means so as to produce beneficiated, dewatered, carbonized solids product.
Dependencies are inferred from the claim text.