An SCR denitrification system uses a catalyst layer to support the reaction between NOx and reducing agent in flue gas. It is used for power boilers, waste heat boilers, glass kilns, cement lines, steel plants, and other projects that need a steady outlet NOx value. The system normally includes reagent preparation, injection grid, mixing section, SCR reactor, catalyst modules, instruments, and control cabinet. Reactor size, duct transition, and guide plates are checked together because uneven gas flow can shorten catalyst life.
Product Parameters
|
Parameter |
Specification |
|
Process principle |
Selective catalytic reduction for NOx control |
|
Core parts |
Injection grid, mixer, SCR reactor, catalyst module, access door, and control system |
|
Temperature window |
Commonly around 300-400 C; low-temperature catalyst can be selected by project |
|
Reducing agent |
Ammonia water, liquid ammonia system, or urea solution system |
|
Catalyst form |
Honeycomb, plate type, or corrugated catalyst |
|
Design check |
Flow speed, dust condition, SO2/SO3 risk, pressure drop, and ammonia escape |
Components
The reactor shell holds catalyst blocks in layers, with support beams and sealing parts around the frame. Access doors are kept near catalyst layers because inspection and ash cleaning are common work during shutdown.
Installation Notes
1. Leave enough straight duct length before the reactor when the site allows it, because uneven gas flow can make one catalyst area carry more dust.
2. Keep lifting space above or beside the catalyst layer, so modules can be replaced without cutting nearby platform parts.
3. Check whether compressed air, steam, or acoustic cleaning is needed before the SCR denitrification system is sent to site.
FAQ
Q: How does SCR differ from SNCR?
A: SCR uses catalyst modules, so it can work at a different temperature range and usually gives more stable NOx control.
Q: What may affect catalyst life?
A: Dust loading, alkali metal, sulfur condition, temperature swing, and poor gas distribution can all affect catalyst life.
Q: Can the reactor be made in sections?
A: Yes. A SCR denitrification system can be divided into transportable sections, and each section can be marked for site assembly.
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