NOx treatment | Boiler nitrogen oxide tail gas treatment


Release time:

2024-05-20

Nitrogen oxides are one of the main sources of air pollution. They can combine with other substances in the atmosphere to form acid rain, ozone and fine particles, leading to the deterioration of air quality. With the development of the social environment, many countries and regions have strict environmental regulations, requiring boiler emissions of nitrogen oxides must be controlled under a certain standard, nitrogen oxides are harmful to human health, long-term exposure to high concentrations of nitrogen oxides in the environment, may lead to respiratory diseases, heart disease and other health problems. Reducing nox emissions from boilers helps protect public safety.

Widely used in both industrial and civil fields, boilers are one of the key equipment in thermal power plants, which are used to burn fossil fuels to produce steam, which in turn drives turbines to generate electricity. In the process of steel production and metal processing, the steam generated by the boiler is used for heating, forging and heat treatment. In the production of cement and ceramics, the boiler acts as the necessary heat to maintain the production process. There are also boilers designed to incinerate waste, recycling heat from waste to produce steam or electricity. With the development of technology and the improvement of environmental protection requirements, modern boiler design is increasingly focusing on energy efficiency and emission control to reduce the impact on the environment. At the same time, the use of renewable energy and clean energy is also gradually strengthening, such as biomass boilers, solar boilers and so on. However, in the production process of many boilers, a large amount of nitrogen oxides will be produced, resulting in the production of pollutants.

The low-nitrogen transformation of the boiler is to reduce the emission of nitrogen oxides in the combustion process of the boiler through technical means and equipment transformation to meet environmental regulations and standards. Selective reduction denitrification of boilers is a mature denitrification technology used to reduce nitrogen oxide emissions. Suitable for ammonia (NH₃) or urea as a reducing agent, under a certain catalytic and temperature action, reaction into harmless nitrogen (N₂) and water (H₂O).

SCR denitrification technology is one of the most widely used and mature denitrification technologies at present, and is widely used in flue gas denitrification of industrial boilers and power station boilers. Using a reducing agent under the action of a metal catalyst, it selectively reacts with NOx to become nitrogen and water. Due to its high efficiency and maturity, SCR denitration technology plays an important role in environmental governance in many industrial fields and different countries. Low-nitrogen transformation not only helps to reduce environmental pollution and improve public health, but also is an important step in technological upgrading and sustainable development. Enterprises should choose the appropriate low nitrogen transformation scheme according to their own situation and local regulations.