With the increasingly strict environmental protection laws and regulations, environmental pollution in industrial production has been widely concerned. In the smelting industry, the problem of excessive nitrogen oxides (NOx) produced by smelting furnaces is particularly prominent. Nitrogen oxides (nox) are a major atmospheric pollutant, which have a serious impact on the environment and human health. Therefore, how to effectively deal with the problem of excessive nitrogen oxides in smelting furnaces has become a top priority. This paper will discuss the causes and treatment methods of excessive nitrogen oxides in smelting furnaces.
First, the cause of excessive nitrogen oxides
1. The nitrogen content in the fuel is high: the nitrogen element in the fuel is easy to combine with oxygen to produce nitrogen oxides during the combustion process. If the nitrogen content of the fuel is higher, then the nitrogen oxides produced during combustion will also increase accordingly.
2, the combustion temperature is too high: high temperature combustion will accelerate the generation of nitrogen oxides. In the smelting furnace, if the combustion temperature is too high, it will lead to an increase in nitrogen oxide emissions.
3, the air excess coefficient is too large: the air excess coefficient refers to the ratio of the actual supply of oxygen and the theoretical oxygen demand. Too much excess air leads to inadequate combustion, which increases the production of nitrogen oxides.
4, equipment aging and maintenance is not in place: equipment aging and maintenance is not in place will lead to reduced combustion efficiency, thereby increasing nitrogen oxide emissions.
Second, treatment methods
1, optimize the combustion process: by adjusting the burner structure, improve the burner design, improve the burner performance and other means to achieve the optimization of the combustion process, reduce the combustion temperature, reduce the generation of nitrogen oxides.
2, control air excess coefficient: reasonable control of air excess coefficient, ensure adequate combustion, reduce the generation of nitrogen oxides. It can be achieved by adjusting the air volume of the fan and changing the structure of the burner.
3, choose low nitrogen fuel: try to choose low nitrogen fuel to reduce the content of nitrogen in the fuel, thereby reducing the generation of nitrogen oxides.
4, install denitration device: Install denitration device on the smelting furnace, such as selective catalytic reduction method (SCR) or selective non-catalytic reduction method (SNCR), to treat the emission of nitrogen oxides and reduce its emission concentration. Green Valley SCR denitration patented mixing technology can ensure the full mixing of ammonia and flue gas, so as to achieve near-zero emission of nitrogen oxides.
5. Strengthen equipment maintenance and management: regularly overhaul and maintain the smelting furnace to ensure that the equipment is in good operating condition, improve combustion efficiency, and reduce nitrogen oxide emissions.
6, strict implementation of environmental regulations: enterprises should strictly abide by national and local environmental regulations, increase investment in environmental protection, improve environmental awareness, and ensure that smelting furnace nitrogen oxide emissions meet the standards.
Post time: Dec-14-2023