Solutions for the corrosion of pipe fittings caused by hydrogen sulfide in gasification
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Do anyone have any good suggestions? Personally, I think that in terms of production processes, current technology still makes it impossible to avoid hydrogen sulfide; therefore, the solution lies in using pipe fittings. Pure corrosion-resistant metals are too expensive – is welding a corrosion-resistant layer onto the inner wall the best approach?
It is possible to consider using a lining made of material resistant to hydrogen sulfide corrosion, while ordinary carbon steel can be used for the outer layer
For lining cladding, select a material with an appropriate formula, as this is relatively more economical.
We once chose CS+ Inconel 825 to prevent chloride corrosion
Well, the cost of 825 is too high.
Ceramics cannot withstand high pressure, are inconvenient to handle, and can easily break if bumped
Well, yes, 825 is widely used in the chemical industry; in oil extraction, people usually turn to us for cladding with 625
The Incoloy 625 alloy exhibits excellent corrosion resistance in many media. It exhibits excellent resistance to pitting corrosion, crevice corrosion, intergranular corrosion, and erosion in chloride media. It exhibits excellent resistance to corrosion by inorganic acids, such as hydrochloric acid, phosphoric acid, sulfuric acid, and nitric acid, and it also has resistance to corrosion by alkalis and organic acids in both oxidizing and reducing environments. Effective resistance to chloride-induced reduction stress corrosion cracking. It exhibits almost no corrosion in seawater and industrial gas environments, showing high corrosion resistance to seawater and salt solutions, as well as at high temperatures. No sensitivity during welding. It exhibits resistance to carburization and oxidation in both static and cyclic environments, as well as resistance to corrosion by chlorinated gases. The high nickel content of Incoloy 825 confers effective resistance to stress corrosion cracking on the alloy. It exhibits excellent corrosion resistance in various media, such as sulfuric acid, phosphoric acid, *ao acid, and organic acids, as well as alkali metals like sodium hydroxide, potassium hydroxide, and salt acid solutions. The superior overall performance of Incoloy 825 is evident in nuclear combustion dissolvers that handle a variety of corrosive media, such as sulfuric acid, *ao acid, and sodium hydroxide, all within the same equipment.
The hydrogen sulfide content in raw gas is relatively low, so there is no problem using carbon steel. Stainless steel is generally used for purifying and separating hydrogen sulfide-containing acidic gases. This certainly needs to be taken into account when selecting materials for design.