Patent US3972478A successfully refreshed from Google Patents.
Patent US771067A successfully refreshed from Google Patents.
Patent US3373910A successfully refreshed from Google Patents.
Patent US4465022A successfully refreshed from Google Patents.
US4465022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed retrofit boiler
Assignee: STONE INTERNATIONAL Ltd A CORP OF GREAT BRITAIN
•
Filing: 1982-07-23
•
Granted: 1984-08-14
•
Expires: 2002-07-23
Abstract
Abstract A boiler is adapted for solid-fuel firing by connecting with an existing combustion chamber of the boiler. Apparatus comprising a bed of particles with means for feeding solid fuel and primary air to the bed. Secondary air is fed to the existing combustion chamber of the boiler with heated gases which leave the bed.
Inventors
- 👤 Michael J. Virr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:00
CPC Classifications
F; F23; F23B; F23B3/00; F22; F22B; F22B31/00; F22B31/0007; F22B31/0046; F23B5/00; F23B5/04; F23C; F23C10/00; F23C10/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A method of adapting for solid-fuel firing a boiler having a combustion chamber with an opening for normally receiving a fluid fuel burner, comprising the steps of attaching to said boiler at said opening and upstream of said combustion chamber, (a) a fluidized bed combustion chamber, (b) solid fuel feed means for feeding solid fuel to the fluidized bed, (c) primary combustion air feed means for feeding primary combustion air to the fluidized bed, and (d) secondary combustion air feed means adjacent said opening for feeding secondary combustion air to said first mentioned combustion chamber with gases emerging from said fluidized bed combustion chamber.
Claim 2
Independent Claim
104 words
A method of adapting for solid-fuel firing a boiler having a combustion chamber with an opening for normally receiving a fluid fuel burner, comprising the steps of attaching to said boiler at said opening and upstream of said combustion chamber, (a) a fluidized bed combustion chamber, (b) solid fuel feed means for feeding solid fuel to the fluidized bed, (c) primary combustion air feed means for feeding primary combustion air to the fluidized bed, and (d) secondary combustion air feed means adjacent said opening for feeding secondary combustion air to said first mentioned combustion chamber with gases emerging from said fluidized bed combustion chamber.
Claim 3
Dependent Claim
34 words
The method in claim 1 including the step of regulating the degree of combustion of fuel in said fluidized bed combustion chamber to less than complete combustion by restricting the primary combustion air thereto.
Claim 4
Dependent Claim
34 words
The method in claim 2 wherein the primary combustion air is restricted to an amount in the range of 20% to 70% of that required for complete combustion in said fluidized bed combustion chamber.
Claim 5
Dependent Claim
101 words
A boiler assembly comprising, in combination with a boiler having a combustion chamber and an opening for normally receiving a fluid fuel burner; (a) a fluidized bed boiler chamber upstream of said opening and having its discharge into said opening, (b) solid fuel feed means for feeding said fuel into said fluidized bed, (c) primary combustion air feed means for feeding primary combustion air to the fluidized bed, and (d) secondary combustion air feed means adjacent said opening for feeding secondary combustion air to the gases emerging from said fluidized bed combustion chamber and flowing into said first mentioned combustion chamber.
Claim 6
Dependent Claim
101 words
A boiler assembly comprising, in combination with a boiler having a combustion chamber and an opening for normally receiving a fluid fuel burner; (a) a fluidized bed boiler chamber upstream of said opening and having its discharge into said opening, (b) solid fuel feed means for feeding said fuel into said fluidized bed, (c) primary combustion air feed means for feeding primary combustion air to the fluidized bed, and (d) secondary combustion air feed means adjacent said opening for feeding secondary combustion air to the gases emerging from said fluidized bed combustion chamber and flowing into said first mentioned combustion chamber.
Claim 7
Dependent Claim
18 words
The boiler assembly in claim 4 including an adaptor between said opening and said fluidized bed boiler chamber.
Claim 8
Dependent Claim
27 words
The boiler assembly in claim 5 wherein said fluidized bed boiler chamber has a shallower part near said adaptor and a deeper part remove from said adaptor.
References Cited (Backward Citations)
US3625164A
Cited
US3890935A
Cited
US3808986A
Cited
US3866551A
Cited
GB1475991A
Cited
US4080910A
Cited
US4027602A
Cited
US4279222A
Cited
US4213405A
Cited
US4267801A
Cited
US4273073A
Cited
US4268244A
Cited
US4296711A
Cited
GB2088237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |