Nitrogen oxide control | how should the nitrogen oxide (NOx) of coal-fired boilers be controlled?

Release time:

2022-09-05

The main methods for controlling nitrogen oxides (NOx) of coal combustion are as follows: 1. Reforming the combustion mode and production process of the boiler; 2. Denitrification of fuel; (the purpose of reforming the combustion mode and production process of the boiler and denitrification of the fuel is to reduce the production of nitrogen oxides (NOx) during the combustion process.) 3. Flue gas denitration. Flue gas denitration is the treatment of nitrogen oxides (NOx) in the flue gas after combustion. The improvement of combustion mode to control the generation of nitrogen oxides (NOx) has been deeply studied at home and abroad, and many combustion technologies and equipment with low NOx emissions have been developed. Some boilers and other kilns have been applied, but some combustion technologies and equipment with low NOx emissions will reduce the combustion efficiency, A lot of fuel is not completely burned, resulting in waste.

After the combustion of coal-fired boilers, the exhaust gas not only causes great harm to the generated pollutants and the environment, but also causes respiratory system risks to human health, damages the development of human lungs, and directly affects human physical and mental health. Therefore, the national and local environmental protection departments pay attention to the emission of nitrogen oxides from boilers, and it is necessary to control the exhaust gas emission from boilers.

The main methods for controlling nitrogen oxides (NOx) of coal combustion are as follows:

1. Reforming the combustion mode and production process of the boiler;

2. Denitrification of fuel;

(the purpose of reforming the combustion mode and production process of the boiler and denitrification of the fuel is to reduce the production of nitrogen oxides (NOx) during the combustion process.)

3. Flue gas denitration.

Flue gas denitration is the treatment of nitrogen oxides (NOx) in the flue gas after combustion. The improvement of combustion mode to control the generation of nitrogen oxides (NOx) has been deeply studied at home and abroad, and many combustion technologies and equipment with low NOx emissions have been developed. Some boilers and other kilns have been applied, but some combustion technologies and equipment with low NOx emissions will reduce the combustion efficiency, A lot of fuel is not completely burned, resulting in waste.

There are two dry methods of flue gas denitration technology: selective catalytic reduction (SCR) and selective non catalytic reduction denitration (SNCR). Selective catalytic reduction (SCR) directly processes the tail gas of the boiler without any impact on the boiler body. The independent real-time online monitoring and control system can stably achieve 30mg / Nm3, and the treatment efficiency is over 95%. Its advantages are low investment, simple equipment and process, high efficiency of nitrogen oxide treatment, and not easy to cause secondary pollution.

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