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High Dust Configuration
- In the case of high-dust configuration, the SCR reactor is installed right at the rear of the economizer, and this location becomes the front of the air pre-heater.
- The biggest benefit of this structure is the fact that there is no separate pre-heating required to insert gas into the SCR reactor. Generally, the inserted gas is 300-430°C.
- The basic advantage of a high-dust system is the low initial investment cost and the savings in operational costs.
Low Dust Configuration  - In this arrangement, the catalyst becomes placed in the rear of the electrostatic precipitator or the bag-filter.
- Since the gas at the rear of the electrostatic precipitator is inserted into the SCR reactor, extremely small particles of dust are inserted; on the other hand, a lot of SO2 is also inserted.
- Since the temperature of emission gas does not reach the reactive temperature of De-NOx Catalyst, in many cases it requires an extra temperature-raising system.
Tail End Arrangement - This structure is widely being applied in Western Europe. Also, this is used for remodeling of the original generating facilities.
- The SCR facility is installed at the very rear of other emission gas treatment facility. (eg. At the rear of a precipitator or Desulfurization Facility (FGD))
- Since there is a very small amount of dust or SO2 in the emission gas, exposure of catalyst to catalyst toxin may be prevented.
- Since the temperature of emission gas does not reach the reactive temperature of De-NOx Catalyst, in many cases it requires an extra temperature-raising system.
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