EP0003117A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Two-zone fluid bed combustion/gasification
Assignee: Battelle Development Corp
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Filing: 1979-01-08
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Granted: —
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Expires: 1999-01-08
Abstract
Abstract A method of operating a fluidized bed system in a single vessel, typically as a combustor system for power or steam generation burning high-sulfur coal or as a gasifier for high-sulfur coal, which comprises forming an entrained fluidized bed in a first space region containing a first solid bed particle component, such as sand or hematite ore containing over 90% Fe 2 O 3 , forming in a limited space region partially within the first region a dense fluidized bed containing a second solid bed particle component, such as larger particles of the hematite, effecting division of the dense fluidized bed into upper and lower zones, providing a recirculation path such as through a cyclone separator and particle reservoir for the first particle component from the first space region through the upper zone of the dense fluidized bed in the more limited space region, operating the fluidized bed system at a velocity such that the second component particles are effectively retained in the dense fluidized bed in the more limited space region, whereas the first component particles recirculate and interpenetrate through the upper zone thereof commingling with the second component particles, and maintaining different temperatures in the upper and lower zones of the dense fluidized bed.
Inventors
- 👤 Herman Nack
- 👤 Ke-Tien Liu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 18:16
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/02; F23C10/04; F23C10/08; F23C10/10; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/32; B01J8/38; B01J8/384; B01J8/388; C; C10; C10B; C10B49/00; C10B49/16; C10B49/20; C10B49/22; C10J; C10J3/00; C10J3/46; C10J3/54; C10J3/56; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0953; C10J2300/0956; C10J2300/0959; C10J2300/0966; C10J2300/0973; C10J2300/0976; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
262 words
A method for operating a fluidized bed system (1) characterised in forming an entrained fluidized bed (4) in a first space region (I) containing a first relatively fine solid bed particle component (6) and forming in a more limited space region (II) partially within the first space region (I) a dense fluidized bed (2, 3) containing a second relatively coarse solid bed particle component(7), both the first and second component particles (6, 7) essentially comprising a material having long-term physical and chemical stability in the fluidized bed system (1) so as to be substantially nonagglomerating and not subject to substantial attrition therein, providing a baffling means (5) within the dense fluidized bed (2, 3) within the more limited space region (II), such that the dense fluidized bed (2, 3) is divided into contiguous upper and lower zones (3, 2) wnich remain in fluid communication, providing a recirculation path for the first particle component (6) from the first space region (I) through the dense fluidized bed (2, 3) in the more limited space region (II), operating the fluidized bed system (1) at a velocity such that the second component particles (7) are effectively retained in a fluidized state in the dense fluidized bed (2, 3) in the more limited space region (I), whereas the first component particles (6) recirculate ana interpenetrate through the second component particles (7) of the dense fluidized bed (2, 3), and maintaining a difference in temperature between the lower zone (2) of the dense fluidized bed (2,3) and the upper zone (3) of the dense fluidized bed (2, 3).
Claim 2
Independent Claim
262 words
A method for operating a fluidized bed system (1) characterised in forming an entrained fluidized bed (4) in a first space region (I) containing a first relatively fine solid bed particle component (6) and forming in a more limited space region (II) partially within the first space region (I) a dense fluidized bed (2, 3) containing a second relatively coarse solid bed particle component(7), both the first and second component particles (6, 7) essentially comprising a material having long-term physical and chemical stability in the fluidized bed system (1) so as to be substantially nonagglomerating and not subject to substantial attrition therein, providing a baffling means (5) within the dense fluidized bed (2, 3) within the more limited space region (II), such that the dense fluidized bed (2, 3) is divided into contiguous upper and lower zones (3, 2) wnich remain in fluid communication, providing a recirculation path for the first particle component (6) from the first space region (I) through the dense fluidized bed (2, 3) in the more limited space region (II), operating the fluidized bed system (1) at a velocity such that the second component particles (7) are effectively retained in a fluidized state in the dense fluidized bed (2, 3) in the more limited space region (I), whereas the first component particles (6) recirculate ana interpenetrate through the second component particles (7) of the dense fluidized bed (2, 3), and maintaining a difference in temperature between the lower zone (2) of the dense fluidized bed (2,3) and the upper zone (3) of the dense fluidized bed (2, 3).
Claim 3
Dependent Claim
74 words
A methoa as in claim 1 for promoting the high- efficiency reaction between at least two reactants comprising a gaseous material and/or a carbonaceous fuel, characterised in feeding the reactants into the fluidized bed system (1) in such manner as to provide thorough mixing of the reactants as a result of the motion ot the commingled particles in the dense fluidized bed (1) and withdrawing an energy product from the fluidized bed system (1).
Claim 4
Dependent Claim
26 words
A method as in claim 2, characterised in that the carbonaceous fuel is burned in the fluidized system (1) and that the energy product is heat.
Claim 5
Dependent Claim
31 words
A.method as in claim 2, characterised in that the carbonaceous fuel is a solid particulate or liquid aerosol, the carbonaceous fuel is gasified and the energy product is a gaseous hydrocarbon.
Claim 6
Dependent Claim
18 words
A method as in claim 3 or 4, characterised in that the carbonaceous fuel is a particulate coal.
Claim 7
Independent Claim
69 words
A method according to at least one of the claims 1 to 5, characterised in that the lower zone (2) of the dense fluidized bed (2, 3) is maintained at a higher temperature than the upper zone (3) and that the recirculation path for the first particle component (6) is provided from the first space region (I) through the upper zone (3) of the dense fluidized bed (2, 3).
Claim 8
Dependent Claim
41 words
A method as in claim 6 wherein sulfur is one of the reactants, characterised in burning the carbonaceous fuel in the lower zone (2) and feeding a sulfur sorbent into the upper zone (3) of the dense fluidized bed (2, 3).
Claim 9
Dependent Claim
24 words
A method as in claim 6, characterised in gasifying the carbonaceous fuel in the lower zone (2) of the dense fluidized bed (2, 3).
Claim 10
Independent Claim
76 words
A method according to at least one of the claims 1 to 5, characterised in that the upper zone (3) of the dense fluidized bed (2, 3) is maintained at a higher temperature than the lower zone (2) of the dense fluidized bed (2, 3) and that the recirculation path for the first particle component (6) is provided from the first space region (I) through the lower zone (2) of the dense fluidized bed (2, 3).
Claim 11
Dependent Claim
45 words
A method as in claim 9, characterised in that at least a portion of the carbonaceous, sulfur-containing fuel is burned in the upper zone (3) of the dense fluidized bed (2, 3) and that a sulfur sorbent is fed into the fluidized bed system (1).
References Cited (Backward Citations)
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