Low NOx burner
US4907962A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 26, 1987 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23C7/004
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A low NOx burner comprises a pulverized coal nozzle for injecting a flow of a mixture of pulverized coal with primary air, a secondary air nozzle arranged externally of and coaxially with the pulverized coal nozzle, a tertiary air nozzle arranged externally of the secondary air nozzle and disposed coaxially with the pulverized coal nozzle, and a swirl flow generator for injecting secondary air and tertiary air as a respective swirl flow. Between the secondary air nozzle and the tertiary air nozzle, there is provided a spacer having such a thickness as to delay the mixing of the secondary air and the tertiary air and to form a swirl flow between the secondary air and the tertiary air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.