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With the further improvement of the NOx emission requirements of environmental protection departments, the emission standards of gas-fired boilers range from 80 mg to 50 mg of low nitrogen to below 30 mg of ultra-low nitrogen. In order to meet this requirement, the current main low-nitrogen combustion technologies are staged combustion, flue gas recirculation and premixed metal fiber surface combustion.

As a small integrated gas heat conduction oil boiler, the gas mold temperature machine is equipped with a flue gas waste heat utilization device to achieve the purpose of energy saving to preheat the combustion air temperature to more than 100°C. The specifications of the mold temperature controller are relatively small, generally less than 600,000 kcal, there is no mature low NOx gas burner to choose from, and each manufacturer needs to develop and test it.

Some manufacturers transplanted the pre-mixed metal fiber surface combustion technology used in gas hot water boilers and steam boilers to gas mold temperature machines. They can cope with environmental protection tests in the short term and cannot perform stable low-nitrogen operations for a long time.

After a full demonstration, the main technical measures for ultra-low nitrogen gas mold temperature machine are multi-stage combustion + flue gas recirculation technology, and the size of the furnace is suitable to stabilize the flue gas NOx emission concentration below 30 mg, in Quanzhou, Shandong, Shandong Customers in Heze, Chengdu, Sichuan and other places have conducted repeated commissioning and testing to ensure stable and low-nitrogen operation for a long time.

The fully premixed metal fiber surface combustion technology is to pre-mix the filtered air with natural gas and burn it on the surface of the metal fiber fabric. This technology belongs to micro-flame combustion, which mainly transfers heat by infrared and blue flame. The furnace temperature is reduced from above 1400℃ to below 1000℃. The boiler output decreases more. Equipment that requires high furnace temperature and boiler load should be carefully selected. . In addition, the premixed combustion method should pay attention to control the ignition power and wind-fuel ratio, otherwise it will easily cause flashback and deflagration.