Patent · US Expired

Process of producing wood charcoal in a moving bed

US5584970A · kind A · utility

54Cited by

7References

3Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Jorg Schmalfeld · Friedrichsdorf, DE
Hans J. Eichwald · Gerolzhofen, DE
Udo Zentner · Griesheim, DE

Key dates

Filing date	Mar 7, 1995
Grant date	Dec 17, 1996
Priority date	—
Expiry date	Mar 7, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/145
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The biomass, particularly lump wood, is supplied to a shaft reactor at its top and is initially preheated to temperatures of about 150.degree. to 280.degree. C. and dried by a counterflowing hot gas. This is followed by a treatment in an underlying carbonizing zone, the upper portion of which is supplied with hot purging gas at a temperature of 250.degree. to 600.degree. C. The hot purging gas flows downwardly through the carbonizing zone co-currently with the wood. A gas mixture which contains purging gas and gas produced by carbonization is withdrawn from the lower portion of the carbonizing zone and is at least in part combusted outside the shaft reactor to produce a combustion gas, which is used at least in part as hot purging gas.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.