FGD Technologies
| FGD PROCESS | TECHNOLOGY TYPE | REAGENT USED | BY PRODUCT | PROVEN EFFICIENCY % |
|---|---|---|---|---|
DRY FGD |
Spray Dryer Reactor (SDR) | Pebble Lime | CaSOx solids | 90-95 |
| Duct Reagent Injection (DRI) | Hydrated Lime | CaSOx solids | 40-60 | |
| Dry Recirculating Reactor (DRR) | Hydrated lime | CaSOx solids | 50-80 | |
WET FGD |
Limestone Forced Oxidation | Limestone | CaSOx, gypsum | 95 |
| Lime Slurry | Pebble lime | CaSOx, gypsum | 98 | |
| Seawater | Seawater | None | 98 | |
| Wet Sodium System | Caustic/Soda Ash | Na2SO3/Na2SO4 | 99+ | |
| Wet Magnesium System | MgO | MgSO3 | 98 |
Sulfer removel
Industrial boiler and kiln of small/medium-scale, using either coal briquette or coal powder. Coal water mixture(CWM),produced by direct combination with additive. Pulverized fuel boiler and circulating fluid bed boiler. Calcium injection. Clean coal blending. Main characteristics and advantages.
High efficient desulfurization at temperature can be achieved for the first time, and it can be used to mix proper sulfur absorbent according to the coal type. The desulfurization efficiency is high,and can be higher than 50% and reach the highest level in China using the clean blending coal. Ca/s mol ratio(1.5-2.0)can be decreased, which makes the good combustion of blending coal combined with absorbent.
Other advantages include easy operation, less investment and running cost, less footprint, simple process, no secondary pollution, and high reusable component in the slag. Applied in CFB can removal Sox and Nox simultaneously, the disposed fuel gas can meet the national discharge standard without extra equipment of FGD.
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