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Experience with low NOx burners
Author(s): Lotte Garner
Price: £60.00
Ref: IEACR/99 |
No. of Tables: 7 |
Many power plants have installed low NOx burners and overfire air (OFA), some successfully while others have dealt with a number of difficulties. However, as legislation becomes increasingly more stringent the success rate becomes more important. Newly-built power plants have the advantage that the combustion system and furnace can be designed for minimum NOx emissions, while physical boundaries in older power plants can limit the NOx reduction achievable. Common problems arising after the installation of low NOx burners and OFA include high unburned carbon in the fly ash, corrosion, burner damage and changes in the slagging and fouling pattern. In retrofit cases these issues are more profound. This study describes some of the solutions. Unburned carbon in the fly ash and corrosion are concerns directly linked to the operation of the low NOx combustion system which requires low excess air. The challenge is to generate solutions which do not jeopardise the NOx emissions. Some suggested solutions include burner modifications, combustion optimisation and operational changes.
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