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Technology for controlling NOx generation of gas-fired coal-fired hot water boiler

inGas-fired coal-fired hot water boilerIn the process, the oxygen, air and nitrogen in the fuel produce NOx at high temperature, causing serious pollution to the environment. Introduced low-gas combustion technology to control NOx formation during combustion, and several low-nitrogen burners to reduce NOx content during combustion.

According to the "China Energy Big Data Report (2018)", in China's energy consumption structure, although the proportion of coal consumption has decreased by {{1}}. 1 percentage points in the past decade, The trend is decreasing year by year, but in 20 1 7 years, the proportion of raw coal in the energy production structure is 68. 6%, still occupying the main position. Burning coal in gas-fired coal-fired hot water boilers will release a lot of NOx, causing serious environmental pollution. According to national pollutant emission standards, NOx emissions must not exceed 250 μg / m 3 (daily average) and 3 50μg / m 3 (hourly average). Therefore, the NOx emissions of coal-fired power plants must be strictly controlled. During the combustion process, low-gas combustion technology can effectively reduce NOx production and emissions.

NOx formation mechanism

During the combustion of pulverized coal in gas-fired coal-fired hot water boilers, NOx emissions are closely related to the combustion process, especially the excess air coefficient and combustion temperature.

Fuel NOx is an important part of anthropogenic NOx emissions. According to statistics, fuel-based NOx accounts for more than 75% of total NOx emissions. There are many factors that affect the formation of fuel NOx, not only related to the excess air coefficient, but also related to the combustion temperature, the characteristics of coal, the proportion, composition and distribution of volatiles and coke in the fuel after thermal decomposition.