Re-oriented over fire air ports for reduction of NOx production from pulverized coal-fired burners
US7624707B2 · kind B2 · utility
2Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 29, 2004 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Sep 9, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23L9/02
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An over fire air (OFA) port arrangement for a pulverized coal-fired boiler or furnace has at least one OFA port through each of the sidewalls for injecting OFA to increase residence time for each burner level. Plural OFA ports may be employed, staggered both vertically and horizontally to effectively deliver over fire air to the burner flames at the appropriate time and location to most efficiently reduce the formation of fuel NOx. OFA port configurations for both single-wall and opposed-wall fired furnaces and boilers are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.