Method and apparatus for controlling burner-air-fuel ratio
US4204830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1977 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Aug 26, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E20/34
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
When a burner is supplied with preheated air, the temperature and density of the preheated air may vary during operation of the burner. When the density of the air supplied to a burner varies, it is necessary to vary the rate at which fuel is supplied to the burner in order to maintain a predetermined air-fuel ratio. To effect a variation in fuel flow with burner air density, the present invention utilizes a secondary air flow to simulate the heated flow of air to the burner. The flow rate of the secondary air varies in a manner which is a direct function of variations in the rate of flow of the heated burner air. Changes in the rate of flow of the secondary air are sensed at a predetermined reference temperature. The sensed variations in the secondary air flow are utilized to effect a corresponding change in the rate of fuel flow to maintain a constant air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.