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:
Nov. 13, 1990
Filed:
Feb. 08, 1990
Olli E Arpalahti, Varkaus, FI;
A. Ahlstrom Corporation, Noormarkku, FI;
Abstract
An apparatus for gasifying solid carbonaceous material in a circulating fluidized bed reactor. Particles are separated from the product gas at least in two stages so that in the first stage mainly coarser, so-called circulating particles are separated and returned to the reactor. In the second stage fine carbonaceous and ash-containing particulates are separated from the gas and are made to agglomerate at a raised temperature. Coarser particles thus received are returned to the reactor through a return duct together with circulating particles. Agglomeration is effected in a chamber where a fluidized bed composed of coarse particles is maintained. Fine particulate material and oxygen containing gas are introduced into the free upper part of the chamber so as to form a hot flame (e.g. 1200.degree. C.). The point of the flame penetrates into the fluidized bed. The ash material contained in the fine particulate material melts, and is conducted to the bubbling fluidized bed.