EP0158033A2
Expired / Lapsed
EP
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A method of controlling a fast fluidized bed boiler
Assignee: Babcock and Wilcox Co
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Filing: 1983-03-15
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Granted: —
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Expires: 2003-03-15
Abstract
Abstract A completely cooled fast fluidized bed boiler comprises a reactor (4) having a bottom section (3), an integrated primary non-centrifugal mechanical particle separator (5), a gas pass (7) containing convective heat exchangers (10), and means (6,8,9) for controllably recirculating separated particles into the reactor bottom section (3). Reactor (4), separator (5) and gas pass (7) are built as an integrated unit within one and the same cooling system. The boiler is controlled by maintaining the bed temperature substantially constant or within a relatively narrow temperature interval by regulating the recirculation rate dependent on boiler load. For regulating the recirculation rate a non-mechanical valve, preferably a so-called L-valve (8), is used.
Inventors
- 👤 Lars Ake Strömberg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:58
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0084; F22B35/00; F23; F23C; F23C10/00; F23C10/02; F23C10/04; F23C10/08; F23C10/18; F23C10/28; F23J; F23J15/00; F23J15/02; F23J15/022; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; F23C2206/00; F23C2206/10; F23C2206/101; F23J2217/00; F23J2217/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
43 words
A method of controlling a cooled fast fluidized bed boiler, the boiler comprising a reactor (4) having cooled walls, a primary particle separator (5), a gas pass (7,7a,7b), and means (6,8,9a) for recirculating separated particles into a bottom section (3) of the reactor
Claim 2
Independent Claim
43 words
A method of controlling a cooled fast fluidized bed boiler, the boiler comprising a reactor (4) having cooled walls, a primary particle separator (5), a gas pass (7,7a,7b), and means (6,8,9a) for recirculating separated particles into a bottom section (3) of the reactor
Claim 3
Dependent Claim
56 words
(4), characterized by maintaining the temperature of the bed material of the reactor (4) substantially constant or within a relatively narrow temperature interval by regulating the recirculation flow of separated particles dependent on the boiler load, thereby varying the particle density of the reactor and thus the heat transfer to the cooled walls of the reactor.
Claim 4
Dependent Claim
56 words
(4), characterized by maintaining the temperature of the bed material of the reactor (4) substantially constant or within a relatively narrow temperature interval by regulating the recirculation flow of separated particles dependent on the boiler load, thereby varying the particle density of the reactor and thus the heat transfer to the cooled walls of the reactor.
Claim 5
Dependent Claim
47 words
A method as claimed in claim 1, characterized by sensing the boiler load and regulating the rate of the particle recirculation in response thereto, and by sensing the temperature of the bed material and regulating the supply of fuel and air into the reactor in response thereto.
Claim 6
Dependent Claim
47 words
A method as claimed in claim 1, characterized by sensing the boiler load and regulating the supply of fuel and air into the reactor in response thereto, and by sensing the temperature of the bed material and regulating the rate of the particle recirculation in response thereto.
Claim 7
Independent Claim
31 words
A method as claimed in anyone of the preceding claims, characterized by using a so-called L-valve (8) for regulating the recirculation flow of separated material in the fast fluidized bed boiler.
Claim 8
Independent Claim
98 words
An apparatus for controlling a cooled fast fluidized bed boiler, the boiler comprising a reactor (4) having cooled walls, a primary particle separator (5), a gas pass (7,7a,7b), and means (6,8,9a) for recirculating separated particles into a bottom section (3) of the reactor (4), characterized in that it comprises means for sensing the boiler load, and means for controlling, dependent on the boiler load sensed, said means for recirculating separated particles and thereby the recirculation rate such that the temperature of the bed material of the reactor is maintained substantially constant or within a relatively narrow temperature interval.
Claim 9
Independent Claim
98 words
An apparatus for controlling a cooled fast fluidized bed boiler, the boiler comprising a reactor (4) having cooled walls, a primary particle separator (5), a gas pass (7,7a,7b), and means (6,8,9a) for recirculating separated particles into a bottom section (3) of the reactor (4), characterized in that it comprises means for sensing the boiler load, and means for controlling, dependent on the boiler load sensed, said means for recirculating separated particles and thereby the recirculation rate such that the temperature of the bed material of the reactor is maintained substantially constant or within a relatively narrow temperature interval.
Claim 10
Dependent Claim
54 words
An apparatus as claimed in claim 5, characterized in that said means for recirculating separated particles include a particle storage (6) having a wall (6a) common with the reactor (4) and receiving separated particles from the primary particle separator (5), the particle storage feeding the bottom section of the reactor via controlled valve means.
Claim 11
Dependent Claim
31 words
An apparatus as claimed in claim 5 or 6, characterized in that said means for recirculating separated particles comprise a so-called L-valve (8), using concurrent fluidization for controlling the recirculation rate.
References Cited (Backward Citations)
No citation records indexed.
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