Reducing nox emissions: Pyrolysis gasifier SCR denitrification technology

Release time:

2024-12-10

Due to its high efficiency and environmental protection characteristics, pyrolysis gasifier has been widely used in many fields, and with the development of technology and the improvement of environmental protection requirements, its application scope is expected to be further expanded. Pyrolysis gasifier can be used to deal with agricultural and forestry biomass waste, industrial biomass waste gas treatment, urban solid waste treatment, waste incineration power generation, small and medium-sized waste power stations, energy production, etc.

In the initial reaction stage of pyrolysis gasifier, the combustible solid waste is first cracked, and volatiles, tar and gas products such as methane and oxygen are precipitated. This stage is the main cause of the initial reaction weightlessness, and it is also the stage where nitrogen oxides begin to be produced.

The process principle of pyrolysis gasifier SCR denitrification is mainly based on selective catalytic reduction technology, the core of which is to reduce nitrogen oxides (NOx) in flue gas to harmless nitrogen (N2) and water (H2O) under the action of catalysts. The following is the basic principle of SCR denitration process

Reaction principle:

Under the action of a catalyst (usually containing alkali metals such as iron, vanadium, chromium, cobalt or molybdenum), NOx in the flue gas reacts with the injected ammonia (NH3) in the temperature range of 200-450 ° C to produce nitrogen and water. The main reaction equations are as follows:

4NO+4NH₃+O₂→4N₂+6H₂O

2NO₂+4NH₃+O₂→3N₂+6H₂O

6NO₂+8NH₃→7N₂+12H₂O

SCR denitrification technology can efficiently convert nitrogen oxides into harmless nitrogen and water vapor, the whole process produces few secondary pollutants, SCR flue gas denitrification technology has been widely used in many developed countries, SCR denitrification technology is simple to operate, high stability, can be applied under a wide range of process conditions.

With the improvement of environmental protection requirements, the development of SCR technology in the future will pay more attention to the efficiency and durability of catalysts. The application of intelligent control technology, such as reaction temperature monitoring and regulation systems based on big data and artificial intelligence, will further improve the performance and reliability of SCR systems. Denitrification of pyrolysis gasifier is to meet the requirements of environmental protection regulations, reduce the impact of nitrogen oxides on the environment and human health, improve denitrification efficiency, avoid crystallization and blockage of pyrolysis furnace, and improve the economy of denitrification technology.

News center