How is flue gas recirculation used to reduce NOx?
How is flue gas recirculation used to reduce NOx?
This CPD will consider why there is concern about boiler-emitted NOx and, specifically, how flue gas recirculation can reduce these emissions significantly. From 26 September 2018, under EU regulation No 814/20133, emissions of nitrogen oxides – expressed in terms of nitrogen dioxide – from water heaters should not exceed 56mg·kWh–¹.
How is flue gas recirculated in a forced draught burner?
Electronic combustion management systems ensure the correct amount of flue gas recirculation into the burner, with typically up to 10% of the flue gases being recirculated. Other than this, the requirements are the same as for a standard forced-draught burner, and the main flue carries the same mass flow rate.
What does flue gas recirculation do to a boiler?
This is known as flue gas recirculation (FGR). Although it might be considered that reheating the hot flue gases may exacerbate the production of NOx, the relatively cool (compared with the combustion chamber) inert gas lowers the temperature of the flame, so reducing the production of NOx.
What is the IFGC code for compressed natural gas?
SECTION 413 (IFGC) COMPRESSED NATURAL GAS MOTOR VEHICLE FUEL-DISPENSING FACILITIES arrow_right SECTION 414 (IFGC) SUPPLEMENTAL AND STANDBY GAS SUPPLY arrow_right SECTION 415 (IFGS) PIPING SUPPORT INTERVALS arrow_right SECTION 416 (IFGS) OVERPRESSURE PROTECTION DEVICES arrow_right CHAPTER 5 CHIMNEYS AND VENTS arrow_right
This CPD will consider why there is concern about boiler-emitted NOx and, specifically, how flue gas recirculation can reduce these emissions significantly. From 26 September 2018, under EU regulation No 814/20133, emissions of nitrogen oxides – expressed in terms of nitrogen dioxide – from water heaters should not exceed 56mg·kWh–¹.
SECTION 413 (IFGC) COMPRESSED NATURAL GAS MOTOR VEHICLE FUEL-DISPENSING FACILITIES arrow_right SECTION 414 (IFGC) SUPPLEMENTAL AND STANDBY GAS SUPPLY arrow_right SECTION 415 (IFGS) PIPING SUPPORT INTERVALS arrow_right SECTION 416 (IFGS) OVERPRESSURE PROTECTION DEVICES arrow_right CHAPTER 5 CHIMNEYS AND VENTS arrow_right
Electronic combustion management systems ensure the correct amount of flue gas recirculation into the burner, with typically up to 10% of the flue gases being recirculated. Other than this, the requirements are the same as for a standard forced-draught burner, and the main flue carries the same mass flow rate.
Why is flue gas recirculation a CPD topic?
One of the significant contributing factors is NOx emissions from commercial natural gas boilers. This CPD will consider why there is concern about boiler-emitted NOx and, specifically, how flue gas recirculation can reduce these emissions significantly.
