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Title: Hybrid fluidized bed combuster

Abstract

A first atmospheric bubbling fluidized bed furnace is combined with a second turbulent, circulating fluidized bed furnace to produce heat efficiently from crushed solid fuel. The bed of the second furnace receives the smaller sizes of crushed solid fuel, unreacted limestone from the first bed, and elutriated solids extracted from the flu gases of the first bed. The two-stage combustion of crushed solid fuel provides a system with an efficiency greater than available with use of a single furnace of a fluidized bed.

Inventors:
 [1];  [2]
  1. (Windsor, CT)
  2. (Poquonock, CT)
Publication Date:
Research Org.:
Combustion Engineering, Inc., Windsor, CT (USA)
OSTI Identifier:
864177
Patent Number(s):
US 4325327
Assignee:
Combustion Engineering, Inc. (Windsor, CT) OSTI
DOE Contract Number:
EX-76-C-01-2473
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
hybrid; fluidized; bed; combuster; atmospheric; bubbling; furnace; combined; turbulent; circulating; produce; heat; efficiently; crushed; solid; fuel; receives; sizes; unreacted; limestone; elutriated; solids; extracted; flu; gases; two-stage; combustion; provides; efficiency; available; single; circulating fluid; solid fuel; fluidized bed; fuel provides; bed furnace; produce heat; circulating fluidized; heat efficiently; /122/110/

Citation Formats

Kantesaria, Prabhudas P., and Matthews, Francis T.. Hybrid fluidized bed combuster. United States: N. p., 1982. Web.
Kantesaria, Prabhudas P., & Matthews, Francis T.. Hybrid fluidized bed combuster. United States.
Kantesaria, Prabhudas P., and Matthews, Francis T.. Fri . "Hybrid fluidized bed combuster". United States. doi:. https://www.osti.gov/servlets/purl/864177.
@article{osti_864177,
title = {Hybrid fluidized bed combuster},
author = {Kantesaria, Prabhudas P. and Matthews, Francis T.},
abstractNote = {A first atmospheric bubbling fluidized bed furnace is combined with a second turbulent, circulating fluidized bed furnace to produce heat efficiently from crushed solid fuel. The bed of the second furnace receives the smaller sizes of crushed solid fuel, unreacted limestone from the first bed, and elutriated solids extracted from the flu gases of the first bed. The two-stage combustion of crushed solid fuel provides a system with an efficiency greater than available with use of a single furnace of a fluidized bed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}

Patent:

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  • This patent describes a process for burning high-sulfur coal while removing the sulfur therefrom, comprising: transporting, on a run of an endless grate, a burning bed of high sulfur coal through a furnace from an input end of the furnace to a laterally spaced output end thereof. During this time air is fed upwardly through the bed in quantities and at pressures sufficient only to react with most of the carbon content of the coal in the bed while creating an atmosphere of sulfur-laden gaseous by-products above the bed, free-falling a residue of clinkers and small particles of burned andmore » partly burned coal off the end of the grate run, blowing through the free-falling residue with an upward blast of air of a force sufficient to elevate the small particles upwardly to a level higher than the bed but insufficient force to divert the clinkers from free-falling into a collector, blasting the elevated particles back through the atmosphere above the burning bed towards the front end of the furnace with a blast of air with limestone particles entrained therein. In this way the air reacts with at least most of the carbon contents of the particles while the limestone particles react with and grab the sulfur in the atmosphere above the bed, and forming clinkers consisting of the reacted particles, which clinkers drop onto the burning bed and ride thereon through the furnace and drop off at the end of the grate run.« less
  • A fluid bed combustor as well as a method of making same is disclosed. The combustor comprises a chamber containing a bed of relatively inert particles supported on a substantially horizontal distributor plate, a plurality of heat extractor tubes which pass upwardly through said plate in a substantially vertical direction, said tubes being distributed substantially uniformly over all or part of the plate surface so as to permit efficient heat extraction from the entire fluid bed volume, and means for supplying combustion gas through said plate to support combustion and to fluidize the bed.
  • It has been common practice at petroleum refineries to dispose of oil sludges (containing oil, grease solids and water) in onsite pits. Remediation of these pits has typically involved in-situ solidification of the sludges using mixtures of Portland cement and fly ash. While this leaves the oily material in place, the resulting form is less permeable than the resulting sludge and has significant strength to support a cap. The supported cap reduces the infiltration rate of water to contact the solidified sludges. Due to the cumulative impact of the solidification and capping process the mobility of these materials is thereforemore » reduced. Since 1991 an oil refinery has been investigating the closure of several large storm water impoundment ponds. These ponds contain sediments that are high in oil and grease and mostly low in solids. Oil and grease content ranges from 1.5 to 20% by EPA Method 9071. Consistencies and liquid content of the sediments vary from a very wet free flowing emulsion to a congealed sludge with about 70% solids. The primary concern of closure was to solidify the residues while still maintaining the low leachability and mobility of both metals and volatile organic hydrocarbons (VOCs).« less
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