US3785351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soot cleaning method
Assignee: Individual
•
Filing: 1972-10-13
•
Granted: 1974-01-15
•
Expires: 1992-10-13
Abstract
Abstract Method of cleaning soot particles from heat transfer surfaces in a boiler automatically and at predetermined intervals without the need of manual supervision.
Inventors
- 👤 R Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:51
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/56
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
In an automatic boiler system, a method for cleaning soot from heat transfer surfaces, including: a. reducing the firing rate of the boiler until a preselected lower pressure is attained; b. increasing the firing rate to a first constant level; and c. activating the soot blowing mechanism for a selected time interval adequate to remove soot from the boiler transfer surfaces, the constant level firing rate being sufficient to maintain the steam pressure below a preselected maximum.
Claim 2
Dependent Claim
77 words
In an automatic boiler system, a method for cleaning soot from heat transfer surfaces, including: a. reducing the firing rate of the boiler until a preselected lower pressure is attained; b. increasing the firing rate to a first constant level; and c. activating the soot blowing mechanism for a selected time interval adequate to remove soot from the boiler transfer surfaces, the constant level firing rate being sufficient to maintain the steam pressure below a preselected maximum.
Claim 3
Dependent Claim
20 words
The method of claim 1, including inactivating the normal boiler firing rate controls when the preselected lower pressure is attained.
Claim 4
Dependent Claim
37 words
The method of claim 1, including increasing the steam pressure until the preselected maximum has been attained after completion of the soot cleaning cycle, activating a switching mechanism to return the boiler system to a normal cycle.
Claim 5
Dependent Claim
30 words
The method of claim 1, including increasing the firing rate to a second constant level after the firing cycle has been completed until the preselected maximum pressure has been attained.
Claim 6
Dependent Claim
82 words
In a boiler system having a variable steam demand, a method for controlling the firing rate of the boiler system during a soot cleaning cycle, comprising: reducing the firing rate in the boiler system until a preselected lower pressure is attained; and inactivating the normal boiler system firing controls and firing the boiler at a first constant rate sufficient to both prevent extinguishing of the boiler furnace and maintain the steam pressure below a preselected upper pressure during the soot cleaning cycle.
Claim 7
Dependent Claim
82 words
In a boiler system having a variable steam demand, a method for controlling the firing rate of the boiler system during a soot cleaning cycle, comprising: reducing the firing rate in the boiler system until a preselected lower pressure is attained; and inactivating the normal boiler system firing controls and firing the boiler at a first constant rate sufficient to both prevent extinguishing of the boiler furnace and maintain the steam pressure below a preselected upper pressure during the soot cleaning cycle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |