Hungary (oil/gas)
Site name: AES Tisza II
Town: Tiszaujvaros
Country: Hungary
Client: AES Corporation
MWe: 4 x 215MWe units
Fuels: natural gas & light oil
Year: Units 1 and 4 upgraded in 2004
Year: Units 2 and 3 upgraded in 2008
Nature of project
To engineer, model, supply and start-up low NOx burner modifications to reduce NOx emissions, with no impact on CO or excess Oxygen.
Project objectives
Boiler manufacturer SES Tlmace, natural circulation, each with eight upshot fired burners located in the boiler floor. This upward-firing burner configuration is unusual and several well-known low NOx emission specialists did not wish to attempt this udgrade, but RJM offered an intelligent, practical approach based on a "first principles" approach that was well-suited to the Tisza plant.
Boiler parameters
215MWe, 670 t/hr, 16.8 MPa, 545°C SH, 545°C RH.
The baseline NOx for natural gas firing was 1240 mg/mN3 @ 3% O2 and 860 mg/mN3 @ 3% O2 when firing heavy oil.
Emission guarantees
350 mg/mN3 @ 3% O2 for NG firing, 400 mg/mN3 @ 3% O2 for oil firing, CO less than 175 mg/mN3 @ 3% O2, no increase in excess oxygen.
Final results on Units 1 and 4
Emissions: 200 mg/mN3 @ 3% O2 for natural gas firing, 240 mg/mN3 @ 3% O2 for oil firing, CO less than 100 mg/mN3 @ 3% O2, decrease in excess oxygen.
Final Results on Units 2 and 3
Emissions: Less than 150 mg/mN3 @ 3% O2 for natural gas firing, less than 200 mg/mN3 @ 3% O2 for oil firing, CO less than 100 mg/mN3 @ 3% O2, decrease in excess oxygen.
Other benefits from RJM technology
- Improved heat transfer in the furnace
- No degradation of boiler ducts as per original installation
- Very short commissioning time
- Guarantees met immediately and within project schedules
- Greater than 80% NOx reduction achieved for natural gas firing on all Units
- All Units now in service with 100% availability and all re-rated to 225MWe.
