Hebei Qingda Environmental Protection Machinery Co., Ltd. is one of the leading manufacturers and suppliers of wet flue gas desulfurization equipment in China. If you're going to wholesale high quality wet flue gas desulfurization equipment made in China, welcome to get more information from our factory.
Main Types
Wet flue gas desulfurization systems can be classified according to the absorbent and process used. Common types include:
Limestone-Gypsum Wet Flue Gas Desulfurization
Ammonia-Based Flue Gas Desulfurization
Magnesium-Based Flue Gas Desulfurization
Among these technologies, limestone-gypsum wet flue gas desulfurization is one of the most widely used processes for large-scale industrial applications.
Main Equipment Components
A typical wet flue gas desulfurization system consists of the following major components:
1. Desulfurization Tower (Absorber)
The absorber is the core component of a wet FGD system. It provides sufficient contact between the flue gas and absorbent slurry, allowing SO₂ to be absorbed and chemically converted.
2. Absorbent Preparation and Supply System
This system prepares, stores, and transports the absorbent. For limestone-gypsum FGD systems, it typically includes limestone handling, grinding, slurry preparation, storage, and supply equipment.
3. Flue Gas System
The flue gas system includes the flue gas inlet and outlet ducts, dampers, and related equipment. It is responsible for directing flue gas into and out of the desulfurization system.
4. Oxidation Air System
The oxidation air system supplies air to the absorber to promote the oxidation of sulfite into sulfate and facilitate gypsum formation in limestone-gypsum FGD systems.
5. Gypsum Dewatering and By-product Handling System
This system separates and dewaters the gypsum slurry generated during the desulfurization process. The recovered gypsum can be further utilized depending on its quality and local requirements.
6. Wastewater Treatment System
The wastewater treatment system is used to control and treat process wastewater generated by the wet FGD system before discharge or further reuse.
01
Flue Gas Contact
After leaving the combustion equipment, the flue gas enters the desulfurization tower, or absorber. Inside the tower, the flue gas comes into contact with finely sprayed absorbent slurry, creating a large gas-liquid contact area that promotes the absorption of SO₂.
02
Absorbent Circulation
The absorbent is typically an alkaline slurry, such as limestone slurry, which is prepared by mixing limestone with water. The slurry is continuously circulated and sprayed through the absorber to provide sufficient contact with the flue gas. During this process, SO₂ is absorbed into the liquid phase and reacts with the alkaline absorbent.
03
Oxidation and Conversion
The absorbed sulfur dioxide initially forms sulfite and bisulfite species. Air or oxygen is introduced into the absorber to promote oxidation, converting the sulfite into sulfate. In limestone-gypsum wet FGD systems, the sulfate then reacts with calcium ions to form calcium sulfate dihydrate (gypsum).
04
By-product Treatment
The resulting desulfurization slurry is processed to separate and dewater the solid by-products. In limestone-gypsum systems, the gypsum can be recovered for further utilization, while wastewater and other process streams are treated according to the applicable environmental requirements.
Application Areas
Wet flue gas desulfurization equipment is widely used in industries with significant SO₂ emissions, including:
Coal-fired power plants
Industrial boilers
Steel mills
Cement plants
Coking plants
Chemical plants
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These systems can effectively reduce sulfur dioxide emissions from industrial flue gas and help facilities comply with applicable air emission standards while improving overall environmental performance.
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