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New type of gas burner breaks foreign monopoly Author/Source: Sinochem New Network Date: July 5, 2019 Clicks: 15 Advanced technology enables ultra-low emissions of NOx and CO Reporters learned from a conference on the evaluation of scientific and technological achievements held in Xi’an on June 30 by the Chinese Society for Electrical Engineering that the new ultra-low NOx gas burner developed by Xi’an Xire Boiler Environmental Protection Engineering Co., Ltd. achieves ultra-low CO emissions alongside ultra-low NOx emissions, reaching an internationally leading level; its performance and specifications are superior to those of well-known foreign brands, thus breaking the foreign monopoly in the burner industry. The appraisal committee, chaired by Professor Sun Shaozeng from the School of Energy Science and Engineering at Harbin Institute of Technology, concluded that this technology significantly improves the flame filling degree in the boiler furnace, enables a uniform distribution of the heat load within the furnace, eliminates local hot spots, suppresses NOx formation, and reduces CO emissions. The adopted \"air pocket ventilation\" and \"inner-rich outer-poor\" grading technology enables ultra-low NOx and ultra-low CO emissions, offering superior performance compared to burners from well-known foreign brands. It provides a reliable technical solution for achieving ultra-low nitrogen emissions and stable operation of gas boilers in our country, offering significant economic and social benefits as well as good prospects for widespread adoption. A responsible official from Xire Boilers explained that in order to address the technical challenges associated with traditional gas boilers, such as the difficulty in achieving ultra-low NOx emissions, unstable combustion, furnace vibration, and high CO concentrations in the exhaust gases, they have conducted research in recent years on ways to modify the way fuel and combustion air are supplied to the burners. As a result, they have developed ultra-low NOx gas combustion technology and created a series of new types of ultra-low NOx gas burners. Thanks to its specially designed gas nozzle structure, rotation direction, and extremely high gas flow rate, this device achieves a highly uniform mixing of fuel and air at all levels, thereby reducing the oxygen concentration in the air. The temperature field inside the furnace becomes more uniform as a result of the flames, eliminating the localized high-temperature areas that arise during combustion and thereby reducing the formation of NOx. It is reported that in addition to natural gas, this technology can also be applied to the reduction of nitrogen emissions from boilers using fuels with different calorific values such as chemical process exhaust gases, dry gas, and waste gas. In recent years, it has been put into industrial use in nearly 100 gas boilers with capacities ranging from 1.4 MW to 116 MW in industries such as petrochemicals, power generation, machinery, and electronics. Test results conducted by authoritative agencies show that the NOx emission concentrations are all below 30 mg/m3, and the CO emission concentrations are all below 10 μL/L. This technological achievement has been granted 3 invention patents and 5 utility model patents. It is reported that in recent years, cities such as Beijing, Tianjin, Hebei, Zhengzhou, and Xi’an have gradually introduced new standards requiring that the NOx levels from gas boilers be below 30 mg/m3. This means that almost all gas boilers need to undergo modifications to reduce nitrogen emissions, and it is estimated that the market for burner modifications in China could reach over 10 billion yuan in the coming years. Currently, there are many manufacturers of ultra-low NOx burners both domestically and internationally. Some of these use burner technology in combination with flue gas recirculation to reduce NOx emissions, but they face issues such as unstable combustion, flame surging, and high CO levels. Meanwhile, this field is largely dominated by foreign brands.