Treatment of nitrogen oxides | Progress and challenges in treating NOx from coke oven flue gas

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The steel industry is one of the main sources of global nitrogen oxide (NOx) emissions, the use of coke oven as a key link in the steel production process, its NOx emission control is particularly critical, low nitrogen transformation is of great significance to improve air quality and promote sustainable development.

As one of the major sources of global nitrogen oxide (NOx) emissions, the steel industry's low-nitrogen transformation efforts are of great importance for improving air quality and promoting sustainable development. As a key link in steel production process, NOx emission control in coke oven flue gas is particularly critical.

Coke ovens are mainly used in the coking stage, which converts coal into metallurgical fuel and chemical raw materials. The source of nitrogen oxides in coke oven is mainly in the coking process, due to the high temperature distillation of coal, will produce a large number of NOx, these gases will not only cause serious pollution to the environment, but also pose a threat to human health, is the formation of acid rain and photochemical smog of the main pollutants.

At present, denitrification technology is widely used in industry. Under a certain temperature and catalysis, ammonia is used as a reducing agent to reduce NOx to nitrogen and water. In coke oven flue gas treatment, selective catalytic reduction (SCR denitrification equipment) is usually used after the flue gas has been desulfurized to further reduce nitrogen oxide (NOx) emissions in the flue gas.

Our company's SCR denitration system has a number of invention patents, and the system and its supporting engineering services are widely used in standby generator sets, gas turbines, boilers, kilns, heat treatment furnaces, etc., and have accumulated a large number of successful cases in industrial manufacturing enterprises, power plants, metallurgy, steel, glass, non-ferrous metals, cement and various heat treatment industries. The company can provide one-to-one customized design solutions based on complex coking furnaces in the steel industry to meet the ultra-low emission standards of nitrogen oxides in different places and regions.

The existing denitrification technology still faces many challenges in practical application, such as SCR denitrification technology needs to be in high temperature conditions, coke oven flue gas temperature is low, need extra preheating steps. However, the construction and operation costs of denitration equipment are relatively high, especially for small and medium-sized enterprises, and the economic pressure is greater.

With the increasingly stringent environmental regulations, the NOx emission standards of the steel industry are also constantly improving, and enterprises need to constantly adapt to the new environmental requirements. The treatment of coking NOx in the steel industry is an important part of effectively achieving green production, facing difficult challenges, it is necessary to promote the wide application of low nitrogen transformation through technological innovation, policy guidance and market mechanisms. In the future, the steel industry needs to continue to accelerate the elimination or transformation of production capacity, promote energy conservation and emission reduction at the same time, strengthen independent innovation capacity, independent research and development initiative, master the core emission reduction technology, and achieve green sustainable development.