Boiler flue gas treatment device: SCR denitrification equipment


Release time:

2024-06-15

With the acceleration of industrialization, the problem of nox emission in boiler flue gas is becoming more and more serious. As a mature denitrification method, selective catalytic reduction technology converts nitrogen oxides into nitrogen and water through catalysts and reducing agents to achieve high efficiency denitrification. SCR denitration system has the advantages of high denitration rate, wide application range, simple operation and no secondary pollution, so it is widely used in industrial production.

With the acceleration of the industrialization process, energy consumption and environmental pollution problems are increasingly serious, boiler as an important equipment for industrial production and power generation, its emissions of flue gas contains a large number of nitrogen oxides (NOx), which has a serious impact on the environment and human health, the use of efficient denitrification technology for boiler flue gas treatment is particularly important. Selective catalytic reduction technology, which has been widely used in the world, is a relatively mature denitrification method.

1,Selective Catalytic Reduction: selective catalytic reduction catalyst (SCR, hereinafter referred to as SCR) and reducing agent urea solution (or ammonia, NH₃· H2O) as the core purification components. This filter unit can selectively reduce nitrogen oxides (NOx) in the exhaust gas to nitrogen (N₂) and (H₂O). This process is carried out at a specific temperature, 300 ° C to 400 ° C, to ensure the activity of the catalyst and the efficiency of the reaction.

2,ASC: (Ammonia Slip Catalyst) ammonia escape catalyst. An internal combustion engine exhaust aftertreatment device installed at the rear end of the SCR to reduce ammonia (NH₃) leakage in the rear end of the SCR by catalytic oxidation.

3,SCR reaction is a complex, multi-component catalytic reduction reaction, the main reactions are as follows:
NH₃·H₂O→NH₃↑+H₂O (Urea hydrolysis reaction)
NO+NO₂+2NH₃→2N₂↑+3H₂O ₃
4NO+O₂+4NH₃→4N₂↑+6H₂O ₃
2NO₂+O₂+4NH₃→3N₂↑+6H₂O ₃

4,Integrated system composition of Nox in exhaust gas of SCR Denitration system:
(1) Catalyst
(2) PLC system
(3) Compress the supply system
(4) Urea supply system
(5) Reactor shell
(6) Spray mixing section
(7) Cooling system

5,Advantages of SCR denitration technology:
(1) high denitration rate: SCR denitration technology can achieve more than 95% denitration rate;
(2) wide range of application: suitable for various scale of boilers and industrial furnaces;
(3) easy to operate: high degree of automation, easy to operate, remote monitoring and control;
(4) no secondary pollution: the final product is nitrogen and water.

6,Project Case:
Project type: Flue gas NOx treatment
Matching equipment: heating boiler
Product Model: GRNVES-TX (Low temperature Denitration)
Equipment air volume: 30000Nm3 /h and 1500Nm³/h