Low-NOx Burner Application Cases and Parameters
Mar 31,2026
Low-NOx Burners:
Traditional natural gas boiler burners typically exhibit NOx emission levels ranging from approximately 120 to 150 mg/m³; standard low-NOx burners typically range from 30 to 80 mg/m³; while ultra-low-NOx burners typically maintain NOx emission levels below 30 mg/m³.
I. NOx Formation Mechanisms
The NOx present in the flue gas generated by gas combustion consists primarily of NO, via the reaction: O2 + N2 = 2NO – 180 kJ.
Types of NOx found in flue gas:
(1) Thermal NOx (or Temperature-dependent NOx): Formed at high temperatures from the nitrogen present in the combustion air and fuel.
(2) Prompt NOx: Formed during the combustion of hydrocarbons; specifically, when the fuel mixture is rich (fuel-rich conditions), NO is generated rapidly within the reaction zone.
(3) Fuel NOx: Formed through the thermal decomposition of nitrogen-containing compounds within the fuel, followed by their reaction with oxygen to produce NO.
II. Control Methods
Existing low-NOx combustion technologies primarily focus on reducing combustion temperatures and minimizing the formation of thermal NOx, while also aiming to reduce prompt NOx formation through rapid mixing during the initial combustion phase. The key technologies employed include staged combustion (comprising air staging and fuel staging) and flue gas recirculation (comprising external flue gas recirculation and internal flue gas recirculation). Gas combustion primarily generates thermal NOx—specifically, NOx in the flue gas that forms at high temperatures from nitrogen present in the air and fuel—which contributes to environmental pollution.
III. Methods for Controlling Thermal NOx Formation
1. Reduce combustion temperature;
2. Reduce oxygen concentration by conducting combustion under fuel-rich conditions;
3. Minimize the residence time of flue gas within the high-temperature zone;
4. Conduct combustion under conditions significantly deviating from a stoichiometric ratio of α = 1.
IV. Service Content
According to user requirements, our company can provide low-NOx burners for various fuels, including natural gas, coke oven gas, blast furnace gas, biogas, and low-calorific-value tail gas. Even with an auxiliary combustion air temperature <300℃, NOx emissions can still be kept below 80mg/Nm³.
1. Low-NOx Retrofitting of Existing Furnaces and Kilns: During the retrofitting process, the existing burners are directly replaced, minimizing alterations to the furnace itself. Customized retrofitting plans are provided to minimize costs and ensure reliable retrofitting.
2. Production of Matching Low-NOx Burners for New Furnaces and Kilns: We can tailor burners to match the combustion chamber dimensions and back pressure characteristics of the furnace/kiln manufacturer.
Regardless of the method, our products adhere to the concept of precise combustion, using PID logic control and accurate airflow and gas volume ratios to achieve a balance between thermal efficiency and low NOx emissions.
Regardless of the method, our products adhere to the concept of precision combustion, PID logic control, and accurate airflow and gas volume ratio, achieving a balance between thermal efficiency and low nitrogen emissions.
Contact Us
E-mail: yilin@cn-tsjsrs.com
Add: East side of Jingwu Road, Qian'an City, Hebei Province (within the modern equipment manufacturing industry cluster area)
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