Patent application number | Description | Published |
20090056538 | CONTROL OF MERCURY EMISSIONS FROM SOLID FUEL COMBUSTION - A method for removing mercury from flue gases generated by the combustion of coal comprises: storing a starter batch of activated carbon in an agglomerated state; de-agglomerating the starter batch in a separation device to create a contact batch of activated carbon; transporting the contact batch to a contact location; injecting the contact batch into contact with the flue gas at a contact location having a temperature between 400° F. and 1100° F., whereupon the activated carbon of the contact batch adsorbs mercury from the flue gas; and removing the activated carbon having mercury adsorbed thereon from the flue gas. The transporting step is conducted with substantially no intermediate storage of the contact batch following the de-agglomeration of the starter batch to prevent re-agglomeration of the activated carbon prior to injection. | 03-05-2009 |
20090317320 | SYSTEM AND METHOD FOR COPRODUCTION OF ACTIVATED CARBON AND STEAM/ELECTRICITY - A system and method for producing activated carbon comprising carbonizing a solid carbonaceous material in a carbonization zone of an activated carbon production apparatus (ACPA) to yield a carbonized product and carbonization product gases, the carbonization zone comprising carbonaceous material inlet, char outlet and carbonization gas outlet; activating the carbonized product via activation with steam in an activation zone of the ACPA to yield activated carbon and activation product gases, the activation zone comprising activated carbon outlet, activation gas outlet, and activation steam inlet; and utilizing process gas comprising at least a portion of the carbonization product gases or a combustion product thereof; at least a portion of the activation product gases or a combustion product thereof; or a combination thereof in a solid fuel boiler system that burns a solid fuel boiler feed with air to produce boiler-produced steam and flue gas, the boiler upstream of an air heater within a steam/electricity generation plant, said boiler comprising a combustion zone, a boiler-produced steam outlet and at least one flue gas outlet. | 12-24-2009 |
20100018395 | Method for Capturing Mercury from Flue Gas - The present invention relates to use of carbon-based sorbents such as activated carbon for controlling vapor phase mercury emissions in coal-fired power plant flue gases or waste incineration flue gases. The invention features new methods that improve the performance of carbonaceous sorbents for mercury control compared to the previous methods. One method consists of injecting the sorbent (consisting of at least some carbonaceous material) into the flue gas where the flue gas temperature is at a value above about 1100° F. and below about 2000° F. The invention also consists of injecting the sorbent within or upstream of an economizer section in a coal-fired power boiler. Injecting the sorbent at the locations indicated above, rather than further downstream, provides increased residence time for contact between the flue gas and the sorbent resulting in increased mercury capture, improved sorbent utilization, and improved fly ash properties. | 01-28-2010 |
20100113267 | SYSTEM AND METHOD FOR COPRODUCTION OF ACTIVATED CARBON AND STEAM/ELECTRICITY - A system and method for producing activated carbon comprising carbonizing a solid carbonaceous material in a carbonization zone of an activated carbon production apparatus (ACPA) to yield a carbonized product and carbonization product gases, the carbonization zone comprising carbonaceous material inlet, char outlet and carbonization gas outlet; activating the carbonized product via activation with steam in an activation zone of the ACPA to yield activated carbon and activation product gases, the activation zone comprising activated carbon outlet, activation gas outlet, and activation steam inlet; and utilizing process gas comprising at least a portion of the carbonization product gases or a combustion product thereof; at least a portion of the activation product gases or a combustion product thereof; or a combination thereof in a solid fuel boiler system that burns a solid fuel boiler feed with air to produce boiler-produced steam and flue gas, the boiler upstream of an air heater within a steam/electricity generation plant, said boiler comprising a combustion zone, a boiler-produced steam outlet and at least one flue gas outlet. | 05-06-2010 |
20100178624 | Method of Manufacturing Carbon-Rich Product and Co-Products - A method in which a parent hydrocarbon-rich material is processed so as to produce both a carbon-rich solid material that has a higher carbon to hydrogen ratio than that of the parent material and a carbon-deficient combustible gas that has a lower carbon to hydrogen ratio than the parent material. In the process, the material is activated by exposing it to a hot gas stream having elevated levels of one or both of carbon dioxide and water vapor. The combustible gas is combusted to produce heat. At least about 80% of the heat is used in one or more endothermic steps that include drying coal or biomass. | 07-15-2010 |