PHE air-air in low-temperature SCR denitrification

Desulfurization and denitrification is one of the important measures to prevent and control air pollution, which refers to the reduction of NOX generated to N2, thus removing NOX from flue gas, among which SCR denitrification, also called selective catalytic reduction, is a more widely used flue gas denitrification technology internationally. This method mainly uses ammonia (NH3) as the reducing agent to selectively reduce NOX to N2, which has no by-products and does not produce secondary pollution.

Application of flue gas heat exchanger in low temperature SCR denitrification

The Plate Heat Exchanger air-air is a modular structure with a compact structure. The bulges on the plates not only support each other to enhance the structural strength of the equipment as well as the pressure-bearing capacity, but also form channels that are easier to circulate than the corrugated plates to each other, reducing the resistance of the gas through the flow channels. It can produce disturbance to the gas medium and strengthen the heat transfer effect. The heat transfer performance is highly efficient, the surface is smooth and not easy to scale..

In the biomass boiler flue gas denitrification and desulfurization system, after the boiler flue gas passes through the desulfurization device and dust removal device, the SO2 emission concentration of flue gas ≤35mg/Nm3, and particulate matter emission concentration ≤10 mg/Nm3. The flue gas temperature is about 100℃~130℃.

At this moment, the flue gas temperature cannot meet the temperature required for low temperature SCR (SCR is selective catalytic reduction technology, the denitrification principle is: under the action of catalyst, ammonia is sprayed into the flue gas at a temperature of about 280-420 ℃ to reduce XNO to 2N and OH2). After the SGH steam heat exchanger, the flue gas is heated to more than 200 ℃. The high temperature flue gas enters the flue gas heat exchanger (GGH) through the denitrification catalyst and is exchanged with the flue gas after denitrification to make the flue gas meet the emission standard.