Air Preheated Combustion and Low NOx Emissions without Flue Gas Recirculation

De Jong Combustion has developed natural gas burner solutions that are able to use preheated combustion air and meet stringent NO_x and CO emissions regulations, without making use of flue gas recirculation.

• The combination of using preheated air and no flue gas recirculation is a key enabler to maximize furnace efficiency (up to 5%) within NO_x emission constraints
• This burner enables the use of waste heat (external or flue gas cooling) to heat up combustion air
• May be applied in combination with deep flue gas cooling (<100 ^oC)

• Heat recovery from flue gas and/or using waste heat to pre heat combustion air can increase furnace/boiler efficiency up to 5%
• De Jong Combustion burners are proven to emit <60-100mg/Nm3 (3% O₂) NO_x (fuel and furnace dependant) and <50 mg/Nm3 (3% O₂) CO with air preheat temperatures up to 125 ^oC, without flue gas recycle
• De Jong Combustion burners use pre-mixing and staged fuel concepts to reduce peak flame temperatures and as such allow for low NO_x

• De Jong Combustion burners are available up to 40MW and can be applied in steam boilers and process furnaces as green field and retrofit projects
• Processes: combustion and air drying processes
• Installations: boilers, furnaces
• Used fuels: natural gas, refinery/process gasses, hydrogen rich gas
• Industries: power/steam plants, refineries, (petro)chemical plants, food and beverages, paper

• Economics for retrofitting are situation dependant
• 6 MW steam generator (8000 hrs/a)
• Capital investment (installed) 112,5k€
• Fuel and CO₂ cost savings (CO₂ at 25€/t): 53k€/j
• Payback period: 2,1 years

• In this example 2,5%. Can go up to 4% energy efficiency
• In this example 237 tons per annum

• Low NO_x emissions (For natural gas 60-80mg/Nm3 at 3%O₂)
• Fuel flexibility (NG, LPG, Hydrogen rich fuels)

• Large industries in the Netherlands and abroad ( i.e.: Shell, ExxonMobil, Petronas, API)