A coal fired boiler denitrification unit is made for boiler flue gas that contains NOx after coal combustion. The unit may inject urea or ammonia water into the furnace high-temperature zone, or it may use an SCR reactor and catalyst at a later duct section. In some boiler rooms, the two processes are combined so part of the NOx is reduced in the furnace first and the rest is treated in the catalyst section. The design is checked with boiler load, gas temperature curve, inlet NOx, dust content, sulfur condition, fan margin, and outlet target.
Product Parameters
|
Parameter |
Specification |
|
Boiler type |
Coal fired steam boiler, hot water boiler, power boiler, or industrial boiler |
|
Process route |
SNCR, SCR, or SNCR-SCR combined route |
|
Reaction range |
SNCR usually 850-1100 C; SCR commonly set by catalyst and gas condition |
|
Reducing agent |
Urea solution or ammonia water by site storage and safety rule |
|
Main sections |
Storage, dilution, dosing, spray lance, reactor or catalyst area, instruments, and cabinet |
|
Checking data |
Boiler load curve, gas volume, NOx value, dust content, sulfur content, and fan pressure |
Product Advantages
The dosing amount can be linked with boiler load and NOx feedback, so the operator does not adjust reagent flow only by manual experience.
The combined route can reduce the load on the catalyst section when furnace temperature is suitable for SNCR reaction.
The section marking of the coal fired boiler denitrification unit helps the site team match spray pipes, support frames, and cabinet terminals with less checking time.
Use Notes
Boiler load change should be checked carefully. If the furnace temperature drops below the proper reaction zone during low load, reagent use may rise and ammonia escape may become harder to control. Ash content can also build up near nozzles, guide plates, or catalyst surfaces.
Quality Check
For each coal fired boiler denitrification unit, we check spray lance length, nozzle direction, pump model, valve tag, cabinet wiring, flange size, and reactor section marks against the confirmed drawing before shipment. For catalyst projects, module frame size and sealing strip position are also checked.
FAQ
Q: Can it be used for retrofit work?
A: Yes. The coal fired boiler denitrification unit can be designed for retrofit work, but old duct size, platform space, and fan margin should be measured first.
Q: Why does ash matter?
A: Ash can block nozzles, cover guide plates, or settle on catalyst surfaces. Cleaning space and access doors should be left in the drawing.
Q: What information is needed before quotation?
A: Boiler capacity, fuel data, gas volume, inlet NOx, outlet target, temperature curve, dust content, and site layout are useful before process selection.
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