US6622645B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion optimization with inferential sensor
Assignee: Honeywell International Inc
•
Filing: 2001-06-15
•
Granted: 2003-09-23
•
Expires: 2021-06-15
Abstract
Abstract A method and system for combustion of fuel in a boiler in which flue gasses are produced. The boiler includes a source of fuel, a source of air, and a controller for controlling the ratio of the source of air and the source of fuel inputted into the boiler. A sensor is used for measuring the concentration of oxygen in the flue gasses. The controller is adapted to calculate the amount of air entering the boiler based on the amount of oxygen in the flue gasses to thereby adjust the air to fuel ratio to include calculated air input and air input from the source of air. A preferred fuel is pulverized coal. The method and system provide for the air to fuel ratio to be adjusted to optimize efficiency as well as to minimize NOx production.
Inventors
- 👤 Vladimir Havlena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:03
CPC Classifications
F; F23; F23D; F23D1/00; F23N; F23N1/00; F23N1/02; F23N1/022; F23N5/00; F23N5/003; F23N5/006; F23N5/18; F23N2005/181; F23N2223/00; F23N2223/44; F23N2239/00; F23N2239/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
157 words
A method of controlling combustion of fuel in a boiler in which flue gasses are produced, comprising the steps of: providing a source of fuel; providing a source of air; providing a controller for controlling the ratio of air to fuel fed into said boiler; measuring the oxygen content in the flue gasses; calculating the total amount of air entering said boiler based on the amount of oxygen in the flue gasses; and adjusting the air to fuel ratio by use of a controller adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and measured air input from said source of air to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion; whereby the efficiency and NO x production are improved.
Claim 2
Independent Claim
157 words
A method of controlling combustion of fuel in a boiler in which flue gasses are produced, comprising the steps of: providing a source of fuel; providing a source of air; providing a controller for controlling the ratio of air to fuel fed into said boiler; measuring the oxygen content in the flue gasses; calculating the total amount of air entering said boiler based on the amount of oxygen in the flue gasses; and adjusting the air to fuel ratio by use of a controller adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and measured air input from said source of air to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion; whereby the efficiency and NO x production are improved.
Claim 3
Dependent Claim
17 words
The method of claim 1 , wherein the air to fuel ratio is adjusted to optimize efficiency.
Claim 4
Dependent Claim
19 words
The method of claim 1 , wherein the air to fuel ratio is adjusted to minimize NO x production.
Claim 5
Dependent Claim
12 words
The method of claim 1 , wherein said fuel is pulverized coal.
Claim 6
Independent Claim
148 words
A system for combustion of fuel in a boiler in which flue gasses are produced, comprising: a source of fuel for combustion in said boiler; a source of air for combustion with said fuel in said boiler; a controller for controlling the ratio of said source of air and said source of fuel inputted into said boiler; and a sensor for measuring the production of oxygen in the flue gasses; said controller being adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air, said controller being adapted to control said source of air for combustion to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion.
Claim 7
Independent Claim
148 words
A system for combustion of fuel in a boiler in which flue gasses are produced, comprising: a source of fuel for combustion in said boiler; a source of air for combustion with said fuel in said boiler; a controller for controlling the ratio of said source of air and said source of fuel inputted into said boiler; and a sensor for measuring the production of oxygen in the flue gasses; said controller being adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air, said controller being adapted to control said source of air for combustion to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion.
Claim 8
Dependent Claim
11 words
The system of claim 5 wherein said fuel is pulverized coal.
Claim 9
Dependent Claim
16 words
The system of claim 5 wherein the air to fuel ratio is adjusted to optimize efficiency.
Claim 10
Dependent Claim
18 words
The system of claim 5 wherein the air to fuel ratio is adjusted to minimize NO x production.
Claim 11
Independent Claim
214 words
A system for combustion of fuel in a boiler in which flue gasses are produced, comprising: fuel source means for providing an input of fuel to said boiler for combustion; air source means for providing an input of air to said boiler for combustion with said fuel; controller means for controlling the ratio of said input of air and said input of fuel; and sensor means for measuring the production of oxygen in said flue gasses; said controller means being adapted to calculate the amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air; sensor means for measuring the production of oxygen in the flue gasses; said controller means being adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air, said controller means being adapted to control said source of air for combustion to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion.
Claim 12
Independent Claim
214 words
A system for combustion of fuel in a boiler in which flue gasses are produced, comprising: fuel source means for providing an input of fuel to said boiler for combustion; air source means for providing an input of air to said boiler for combustion with said fuel; controller means for controlling the ratio of said input of air and said input of fuel; and sensor means for measuring the production of oxygen in said flue gasses; said controller means being adapted to calculate the amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air; sensor means for measuring the production of oxygen in the flue gasses; said controller means being adapted to calculate the total amount of air entering said boiler based on the amount of oxygen measured in the flue gasses to control the air to fuel ratio to include calculated total air input and air input from said source of air, said controller means being adapted to control said source of air for combustion to lower the source amount of air to the minimum air to produce the lowest NO x production during combustion.
Claim 13
Dependent Claim
11 words
The system of claim 9 wherein said fuel is pulverized coal.
Claim 14
Dependent Claim
16 words
The system of claim 9 wherein the air to fuel ratio is adjusted to optimize efficiency.
Claim 15
Dependent Claim
18 words
The system of claim 9 wherein the air to fuel ratio is adjusted to minimize NO x production.
References Cited (Backward Citations)
US4253404A
Cited
US4308810A
Cited
US4308810B1
Cited
US4362499A
Cited
JPS5883118A
Cited
US4474121A
Cited
US4815965A
Cited
US4517906A
Cited
US4653998A
Cited
US4742783A
Cited
US5040470A
Cited
US5091884A
Cited
US5123364A
Cited
US5367470A
Cited
US5138958A
Cited
US5230293A
Cited
EP0519178A1
Cited
US5398623A
Cited
US5495813A
Cited
US5501159A
Cited
US5496450A
Cited
US5520123A
Cited
EP0773408A1
Cited
US5764535A
Cited
US5626085A
Cited
US5798946A
Cited
US5794549A
Cited
US5957063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-22 | 2007-03-24 | 2007-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-22 | 2011-03-24 | 2011-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-22 | 2015-03-24 | 2015-09-23 | $7700.00 | Window Closed / Lapsed |