Process for feeding and gasifying solid carbonaceous fuel

Details Process for feeding and gasifying solid carbonaceous fuel Process for feeding and gasifying solid carbonaceous fuel

1985-09-03

1986-11-25

Kratz, Peter

Gas: heating and illuminating

Processes

Fuel mixtures

48202, 48206, 48209, 48DIG7, 252373, C10J 346

Patent

active

046246843

ABSTRACT:
A partial oxidation process for the production of a stream of mixed gases comprising H.sub.2 and CO. An aqueous particulate solid carbonaceous fuel slurry feedstream is preheated by indirect heat exchange with a process-derived stream of skimmed gases substantially comprising H.sub.2 O. The aqueous carrier of the slurry is vaporized by introducing superheated steam directly into the slurry pipeline. A suspension of particulate solid carbonaceous fuel entrained in a gaseous mixture substantially comprising steam e.g. about 90 to 99.9 wt. % H.sub.2 O and about 0.1 to 10 wt. % of a CO.sub.2 -containing gas mixture is produced. The suspension of solid fuel in the gaseous mixture is then separated in a skimming operation into an overhead gas stream substantially comprising steam, as previously described, and a bottom stream comprising particulate solid carbonaceous fuel with the remainder of said gaseous mixture. The bottom stream from the skimming operation is introduced into the reaction zone of a partial oxidation gas generator in admixture with a free-oxygen containing gas and with or without a temperature moderator where a gaseous stream comprising H.sub.2 +CO is produced. In one embodiment, the temperature of the suspension of solid carbonaceous fuel feed stream entering the partial oxidation reaction zone by way of a burner is monitored. An increase in temperature would flag the back-flow of synthesis gas or oxygen into the burner. When this happens, the feedlines to the burner and the overhead gas stream from the cyclone separator may be automatically shut down to prevent thermal damage to the system.

REFERENCES:
patent: 3871839 (1975-03-01), Moody
patent: 4153427 (1979-05-01), Bissett et al.
patent: 4166802 (1979-09-01), Slate et al.
patent: 4341530 (1982-07-01), Loth et al.

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