US4787554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing rate control system for a fuel burner
Assignee: Honeywell Inc
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Filing: 1988-02-01
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Granted: 1988-11-29
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Expires: 2008-02-01
Abstract
Abstract A boiler control system utilizing a microcomputer, a memory, and a firing rate control scheme provides a boiler with a more responsive control arrangement. This improved response is accomplished by the firing rate control converting the desired pressure setpoint to a computed temperature, and then establishing a computed pressure band for control of the boiler.
Inventors
- 👤 James I. Bartels
- 👤 Kenneth B. Kidder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:48
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/20; F23N1/00; F23N1/02; F23N1/022; F23N1/002; F23N2223/00; F23N2223/04; F23N2223/08; F23N2225/00; F23N2225/04; F23N2235/00; F23N2235/02; F23N2235/10; F23N2235/12; F23N2237/00; F23N2237/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A boiler control system having a firing rate control function, including: microcomputer means including memory means, and further including input-output means; said input-output means connected to said microcomputer means and said memory means to provide said microcomputer means and said memory means with a plurality of control parameters for a fuel burner and a boiler which are adapted to be controlled by said boiler control system; firing rate control means connected to said microcomputer means and said memory means with said firing rate control means establishing a pressure control band which is a function of a selected setpoint control pressure and a selected temperature band; said firing rate control means converting said setpoint control pressure into a temperature setpoint; said firing rate control means further converting said selected temperature band and said temperature setpoint into a pressure control band; means to measure a pressure in said boiler; comparator means responsive to said pressure control band and a said measured pressure from said boiler to which said system is adapted to be connected; and said comparator means having output means connected to said fuel burner for said boiler to control said fuel burner to in turn control said pressure in said boiler.
Claim 2
Dependent Claim
201 words
A boiler control system having a firing rate control function, including: microcomputer means including memory means, and further including input-output means; said input-output means connected to said microcomputer means and said memory means to provide said microcomputer means and said memory means with a plurality of control parameters for a fuel burner and a boiler which are adapted to be controlled by said boiler control system; firing rate control means connected to said microcomputer means and said memory means with said firing rate control means establishing a pressure control band which is a function of a selected setpoint control pressure and a selected temperature band; said firing rate control means converting said setpoint control pressure into a temperature setpoint; said firing rate control means further converting said selected temperature band and said temperature setpoint into a pressure control band; means to measure a pressure in said boiler; comparator means responsive to said pressure control band and a said measured pressure from said boiler to which said system is adapted to be connected; and said comparator means having output means connected to said fuel burner for said boiler to control said fuel burner to in turn control said pressure in said boiler.
Claim 3
Dependent Claim
33 words
A boiler control system as claimed in claim 1 wherein said selected temperature band (TBAND) is an empirically selected band of temperatures to provide stable operation of said fuel burner for said boiler.
Claim 4
Dependent Claim
21 words
A boiler control system as claimed in claim 2 wherein said temperature setpoint (TSET) is a computed temperature expressed as: ##EQU2##
Claim 5
Dependent Claim
34 words
A boiler control system as claimed in claim 3 wherein a modified form of said pressure control band is computed as a function of said temperature band, said setpoint pressure, and said temperature setpoint.
Claim 6
Dependent Claim
26 words
A boiler control system as claimed in claim 4 wherein said modified pressure control band (PBAND') is expressed as: 2(PRESSURE SETPOINT-e x +14.7) where x×=-8523.83/(TSET-1/2TBAND+459.67) +15.4267.
Claim 7
Dependent Claim
35 words
A boiler control system as claimed in claim 1 wherein said firing rate control means further adjusts said modified pressure control band as a function of a thermal mass of said boiler to be controlled.
References Cited (Backward Citations)
US4373663A
Cited
US4510576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |