The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1982
Filed:
Aug. 30, 1979
Michael C Chervenak, Pennington, NJ (US);
Edwin S Johanson, Princeton, NJ (US);
Marvin S Rakow, East Brunswick, NJ (US);
Hydrocarbon Research, Inc., Lawrenceville, NJ (US);
Abstract
A multiple-zone fluidized bed coal conversion process for producing fuel gas and distillate liquid products. The coal is fed into an upper fluidized bed maintained at 950.degree.-1500.degree. F. for devolatilization. The resulting coke and some tars are deposited on a particulate carrier material, which descends along with the larger particles of unreacted coal through a stripping zone into a lower fluidized bed gasification zone, which is maintained at 1700.degree.-2000.degree. F. by steam and O.sub.2 -containing gas introduced therein to gasify the coke and char. Fine particles of unreacted coal and carrier are passed with gas and distillate vapor through a cyclone gas-solids separation step located in the devolatilization zone, from which the solids are returned to the lower bed for further gasification. Ash produced in the lower bed along with the clean hot particulate carrier is transferred through an up-transport tube to the upper bed. The effluent from the devolatilization/hydrogenation zone passes through an external cyclone separator which removes the particles as a disposal stream. Alternatively, the effluent from the devolatilization zone may be passed through a third or uppermost bed of particulate carrier material for heat recovery and more complete removal of tars from the product gas.