Keep Your SCR Catalyst Cleanliness with Sonic Horn
Selective catalytic reduction is popular technology for NOx emission control in coal fired plant. Installed before electrostatic precipitator, SCR unit is located between economizer and air preheater. Ammonia is injected to convert NOx at 320~420℃. When flue gas passes through SCR catalyst with honeycomb structure, particulates entrained in gas stream will attach on catalyst surface. It will result in SCR buildup and blockage, which is terrible for deNOx efficiency. NOx can be converted only when flue gas can contact the catalyst. So keeping SCR module clean is critical to achieve project purpose. Sonic horn is ideal cleaning solution widely used in power plants.
How Sonic Horn Cleans SCR Unit
Different with steam or air jet of traditional soot blower, sonic horn dislodge ash, soot, and particulate deposits without physical contact by low frequency, high intensity sound wave (75Hz, 147dB) generated by vibration of Titanium diaphragm. These waves create pressure oscillations that travel through the flue gas and impact the catalyst surface. In the ash and particulate layers, acoustic energy causes microscopic vibrations, which breaks adhesion between deposits and catalyst surface. Loosened particles are carried away by flue gas, preventing re-deposition.
Benefits
- Keep catalyst deNOx efficiency and extend service life.
- Preventative cleaning to avoid buildup and blockage in SCR.
- Lower cost in purchase, installation, operation, maintenance.
- Non-contact cleaning, no damage to catalyst.
- Complete cleaning without dead corner due to reflection and diffraction of sound wave.
Buildup and blockage of SCR will prevent contact between NOx and catalyst, cause poisoning of catalyst and increase pressure drop, sonic horn is proven technology for SCR acoustic cleaning.
