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The application of 904L steel plate in flue gas desulfurization system verifies the deep overlap between material technology and environmental engineering. It extends the equipment life from less than 2 years to more than 15 years, and reduces maintenance costs by 70%.
What challenges in flue gas desulfurization industry meets?
The flue gas emitted by places such as coal-fired power plants, steel sintering plants, and chemical plants often contains high concentrations of sulfur dioxide (SO2). It must be desulfurized to meet the standards before being discharged. At present, the wet flue gas desulfurization (WFGD) process is widely used, but in actual operation, this process is prone to multiple corrosion risks due to complex chemical reactions, which constitutes a very challenging working environment. For example:
- Chemical corrosion: SO₂ dissolves in water to form sulfurous acid (H₂SO₃), which is partially oxidized to highly corrosive sulfuric acid (H₂SO₄).
- Halogen corrosion: The concentration of chloride ions (Cl⁻) carried by coal-fired flue gas can reach tens of thousands of ppm, inducing pitting and stress corrosion cracking.
- Abrasion corrosion: The limestone slurry contains a large amount of solid particles (content 15-20%), which cause erosion on the metal surface under high-speed spraying.
- Temperature fluctuations: The flue gas inlet temperature can reach 160-180°C, and drops sharply to 50-60°C in the absorption tower, resulting in Thermal stress and condensate acidification.
Why do flue gas desulfurization industry choose 904L Plate?
ss904L Plate resistance to general corrosion and pitting
In an acidic slurry environment as low as 1.5-4, 904L can form an extremely stable and self-healing passivation film. Its 904L corrosion rate is usually less than 0.1 mm/year, which means that the life of 904L equipment can be extended several times or even more than ten times. Secondly, 904L can also resist chloride ions. It has almost no pitting or only very shallow pitting in a high-chlorine environment, effectively avoiding leakage accidents caused by pitting perforation.
stainless steel 904L sheet Stress corrosion cracking resistance
Under the combined effects of high Cl⁻, medium and high temperatures (commonly 50-80°C) and acidic environments, austenitic stainless steel is prone to stress corrosion cracking (SCC), especially in the heat-affected zone of welds. The nickel content of 904L as high as 23-28% greatly reduces the risk of catastrophic brittle fracture, ensuring the structural integrity and safe operation of the equipment.
904l ss plate resistance to crevice corrosion
The solution in the crevice is stagnant, hypoxic, acidified and concentrated with Cl⁻, forming an extremely harsh microenvironment, which is prone to severe local corrosion (crevice corrosion). The synergistic effect of high molybdenum and high nickel in 904L makes it extremely resistant to crevice corrosion, effectively solving the corrosion pain points of equipment connection parts and areas prone to deposition.
1.4539 plate stainless steel Excellent weldability and formability
During the welding process of 904L steel plate, chromium carbide will hardly precipitate in the heat-affected zone (HAZ), thereby effectively avoiding the intergranular corrosion sensitivity of the welded joint and ensuring that the corrosion resistance of the weld area is equivalent to that of the parent material. As a fully austenitic structure, 904L steel plate is easy to be processed and formed with cold and hot processing.
alloy 904l High comprehensive economic benefits
Although the initial cost is higher than carbon steel, 316L or even duplex steel, its ultra-long service life in extreme desulfurization environment (up to 15 years, much longer than the 2-5 years of ordinary materials) significantly reduces the frequency and cost of unplanned downtime, maintenance and replacement caused by corrosion failure. Reduces environmental fines and safety accident costs caused by leakage risks. Reduces maintenance workload and spare parts inventory.
Key applications of 904L steel plate in flue gas desulfurization industry
Core reaction vessel
- Absorber shell and internals
- Tower bottom cone section
- Spray layer support beam
Gas-liquid contact system
- Alloy tray (Tray Tower)
- Spray nozzle
Auxiliary system
- Flue and damper door
- Heat exchanger tube bundle
Why choose us?
HT PIPE is a leading stockist and global exporter with over 15 years of expertise in international trade. We supply pipes, 904L stainless steel plates, round bars, and a comprehensive range of pipe fittings, flanges, and valves. Contact us now for free quotes and personalized product information.
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