Anton J Elberg

US Patent:

41000323, Jul 11, 1978

Filed:

Jul 25, 1977

Appl. No.:

5/818522

Inventors:

Anton J. Elberg - Dickinson ND

Assignee:

Husky Industries Inc. - Dickinson ND

International Classification:

C10B 4900
C10B 5300
C10B 5702

US Classification:

201 27

Abstract:

A process for carbonizing lignite coal in a Herreshoff Carbonizer of a multi-hearth type. The novel process comprises the steps of introducing given quantities of lignite in the first and succeeding hearths while introducing sufficient quantities of combustion air and fuel to ignite the fuel and to raise the temperature of the hearths until the process is self-sustaining as a result of the combustion of the volatiles driven off of the lignite. The hearth temperatures range approximately 1450. degree. to 1620. degree. F in the first furnace hearth with the second furnace hearth ranging approximately 1650. degree. to 1800. degree. F and the third furnace hearth ranging approximately 1650. degree. to 1890. degree. F. Sufficient combustion air is introduced into various hearths of the furnace to insure complete combustion in at least the first hearth and in the stack of the volatiles being driven off thereby making the process self-sustaining, allowing the introductory fuel to be cut off. The final volatile content of the specification char made in the furnace from the lignite is controlled by utilizing the remaining succeeding hearths in the furnace with the temperatures ranging in these hearths approximately 900. degree.