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Title: Rapid ignition of fluidized bed boiler

Abstract

A fluidized bed boiler is started up by directing into the static bed of inert and carbonaceous granules a downwardly angled burner so that the hot gases cause spouting. Air is introduced into the bed at a rate insufficient to fluidize the entire bed. Three regions are now formed in the bed, a region of lowest gas resistance, a fluidized region and a static region with a mobile region at the interface of the fluidized and static regions. Particles are transferred by the spouting action to form a conical heap with the carbonaceous granules concentrated at the top. The hot burner gases ignite the carbonaceous matter on the top of the bed which becomes distributed in the bed by the spouting action and bed movement. Thereafter the rate of air introduction is increased to fluidize the entire bed, the spouter/burner is shut off, and the entire fluidized bed is ignited.

Inventors:
 [1]
  1. Alexandria, VA
Issue Date:
OSTI Identifier:
862725
Patent Number(s):
3996863
Application Number:
05/666,535
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F23 - COMBUSTION APPARATUS F23C - METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  {A CARRIER GAS OR} AIR 
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
rapid; ignition; fluidized; bed; boiler; started; directing; static; inert; carbonaceous; granules; downwardly; angled; burner; hot; gases; spouting; air; introduced; rate; insufficient; fluidize; entire; regions; formed; region; lowest; gas; resistance; mobile; interface; particles; transferred; action; form; conical; heap; concentrated; top; ignite; matter; distributed; movement; thereafter; introduction; increased; spouter; shut; ignited; fluidized bed; hot gas; bed boiler; hot gases; carbonaceous matter; /110/122/

Citation Formats

Osborn, Liman D. Rapid ignition of fluidized bed boiler. United States: N. p., 1976. Web.
Osborn, Liman D. Rapid ignition of fluidized bed boiler. United States.
Osborn, Liman D. Tue . "Rapid ignition of fluidized bed boiler". United States. https://www.osti.gov/servlets/purl/862725.
@article{osti_862725,
title = {Rapid ignition of fluidized bed boiler},
author = {Osborn, Liman D},
abstractNote = {A fluidized bed boiler is started up by directing into the static bed of inert and carbonaceous granules a downwardly angled burner so that the hot gases cause spouting. Air is introduced into the bed at a rate insufficient to fluidize the entire bed. Three regions are now formed in the bed, a region of lowest gas resistance, a fluidized region and a static region with a mobile region at the interface of the fluidized and static regions. Particles are transferred by the spouting action to form a conical heap with the carbonaceous granules concentrated at the top. The hot burner gases ignite the carbonaceous matter on the top of the bed which becomes distributed in the bed by the spouting action and bed movement. Thereafter the rate of air introduction is increased to fluidize the entire bed, the spouter/burner is shut off, and the entire fluidized bed is ignited.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1976},
month = {12}
}

Patent:

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