What is the Advantage and Disadvantage of desulfurization pump for steel plants factory

In contemporary industrial practices, flue gas desulfurization methods are categorized based on water usage during the desulfurization process, and the physical state of the by-products. Namely, these methods include wet, semi-dry, and dry desulfurization processes.

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Wet Desulfurization: Pros and Cons

Benefits: The gas-liquid reaction in wet desulfurization promotes a rapid and efficient desulfurization process, achieving rates often exceeding 90%. This mature and widely-applied technology ensures safe and reliable operation, making it a preferred choice in over 80% of large-scale installations.

Drawbacks: The final by-products are typically in liquid or sludge form, complicating disposal efforts. Equipment is prone to severe corrosion, necessitating high energy consumption for post-process reheating of flue gases, and leading to significant operational and investment costs. Large-scale plants with vast areas are generally needed to support this complex system that involves substantial water usage and considerable initial investment.

Common Technologies: Methods like the limestone/lime-gypsum method, indirect limestone-gypsum method, and lemon absorption are frequently utilized.

Dry Desulfurization: Pros and Cons

Benefits: Unlike its wet counterpart, dry desulfurization involves a simpler setup with reduced spatial and financial demands. The process offers the added benefits of low energy usage and the absence of a sewage treatment system. Handling the resultant by-products is straightforward, and the overall operation is simple.

Drawbacks: However, slower reaction speeds and a lower desulfurization rate (60-80%) are significant challenges. Additionally, issues such as low absorption efficiency, severe equipment abrasion and fouling, and difficult maintenance detract from its overall effectiveness and stability, resulting in shorter equipment lifespans.

Common Technologies: The activated carbon adsorption method, electron beam radiation method, and metal oxide desulfurization method are prevalent options.

Semi-Dry Desulfurization Explained

This category encompasses techniques such as spray drying desulfurization, semi-dry and semi-wet desulfurization, and flue jet desulfurization.

Spray Drying Method

In this approach, the absorbent forms mist droplets which, mixed with flue gases, undergo heat exchange and mass transfer to facilitate desulfurization. With an efficiency ranging from 65% to 85%, it effectively utilizes lye, lime milk, or limestone slurry as the absorbent.

Pros: The process is straightforward with dry by-products that are easy to manage. Furthermore, corrosion and blockage issues are minimal, and water consumption is low.

Cons: Higher automation levels and the meticulous control of the absorbent amount are necessary, yet the absorption efficiency remains moderate.

Semi-Dry and Semi-Wet Methods

Striking a middle ground, these methods offer balanced advantages between wet and dry practices, making them ideal for small to medium boiler flue gas treatment. They circumvent the complexity of wet systems and enhance reaction efficiency and absorbent utilization over pure dry systems.

Characteristics: They require lower investment and operating costs, offer decent desulfurization rates (~70%), and are less corrosive while occupying less space.

Special Filter Materials in Semi-Dry Desulfurization

In such systems, bag filters face different operational conditions post-desulfurization due to increased flue gas humidity and dust. Specific ultra-fine filter materials designed with gradient structures enhance dust collection and prolong equipment lifespan.

Advantages:

• Exceptional water and oil resistance, ensuring high performance even with moist gases.
• Ease of dust cleaning, maintaining low resistance during operation.
• High erosion and abrasion resistance for extended service life.
• Superior filtration precision meeting stringent emission requirements.

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At Lenntech, we offer effective and cost-efficient solutions for treating flue gas desulfurization wastewater, either for discharge or process reuse. Leveraging a broad range of technologies and extensive expertise in industrial water treatment, we deliver reliable end-to-end solutions tailored to treat FGD blowdown water efficiently.

The combustion of coal in power plants generates sulfur dioxide (SO2) among other emissions. With over 95% of sulfur in coal converting to SO2 during burning, reducing these emissions has become increasingly critical due to stringent environmental regulations.

Wet scrubbing remains the most common SO2 removal method. In this process, an electrostatic precipitator (ESP) first removes fly ash before the flue gas enters the SO2 absorber. The gas exits the absorber highly corrosive, necessitating the use of corrosion-resistant materials or re-heating above the dew point to prevent downstream equipment damage.

Conversely, dry injection involves limestone reacting with SO2 before particulate removal. This method, while different, also aims to minimize the environmental impact of flue gases.

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