Antisepsis method and material(HastelloyC-276) for inner surface of desulfurization tower.(HY-industry technical centre)
Nickel-based corrosion-resistant alloy plate
Hastelloy C-276 alloy has excellent corrosion resistance to most corrosive media under oxidation and reduction. The corrosion rate of Hastelloy C-276 alloy in 10% sulfuric acid boiling test solution is 0.35mm / y, while 316L 1.615mm / y, 317 is 0.785mm / y; Hastelloy C-276 alloy material has high initial cost, which restricts the application of Hastelloy C-276 corrosion-resistant alloy in desulfurization chimney. With Hastelloy C-276 lining, anti-corrosion measures are not necessary on the inside of the alloy plate. Steel inner tube steel plate and Hastelloy C-276 lined alloy plate are available in factory rolled composite and on-site hanging methods. HASTELLOY C-276 alloy is widely used in desulfurization towers and chimneys.
Titanium plate (TiCr2) lining
Titanium has good stability in acidic, alkaline, and neutral saline solutions and oxidizing media. Titanium corrosion is generally uniform corrosion and pore corrosion. Depending on the combustion medium, its oxidizing substances are different, and the environment Depending on the medium, the rules for the formation of the oxide film are different. If it follows the logarithmic law, the film is protective; if it follows the linear law, it is not protective and the corrosion is rapid.
After the oxide film is destroyed, the corrosion rate of titanium is greater than that of steel if there is no environmental medium for repair. The corrosion resistant medium of titanium refers to those media that can make the titanium passivation film in a stable state. These media are oxidizing Neutral, weakly reducing. Dilute sulfuric acid is weakly oxidizing and belongs to non-oxidizing acid. The effect of oxide repair is extremely limited. The properties of titanium are extremely closely related to the temperature, its morphology and purity.
Dense metal titanium is quite stable in nature. The presence of impurities in titanium significantly affects the physical, chemical, mechanical and corrosion resistance of titanium. In particular, some interstitial impurities can distort the titanium lattice and affect the various properties of titanium. At room temperature, the chemical activity of titanium is very small, and it can react with a few substances such as hydrofluoric acid. However, as the temperature increases, the activity of titanium rapidly increases, especially at high temperatures, titanium can react violently with many substances and cause corrosion. Therefore, the actual smoke composition and dew condensation of the project should be analyzed and applied.
Foamed acid-resistant glass brick lining
The foamed acid-resistant glass brick is made on the basis of boric acid glass. It is resistant to the corrosion of various concentrated acids (except 5% or more hydrofluoric acid) and exhaust gas condensates including chlorides. The anti-corrosion lining formed by foamed acid-resistant glass bricks and adhesive elastomers has anti-corrosion ability under the conditions of chemical environment and temperature changes. Due to its low thermal conductivity, the original chimney lining and insulation structure are combined into one. The glass brick is directly adhered to the inner surface of the inner cylinder of the cigarette by the adhesive material, and the gap between the glass bricks is hooked by the adhesive material, which prevents the corrosion of the inner cylinder structure by the smoke. The corrosion resistance and durability of the bonding material are key. Its aging and cracking will directly affect the corrosion resistance of the overall lining system. The strength of glass brick is much lower than that of metal, but its strength must be able to withstand the impact of smoke. The choice of glass brick primer is very important. It has been used for more than 30 years.
4.Corrosion resistant flake cement lining
Scale flake cement contains 10% -40% glass flakes with different diameters. After the cement is completed, flat glass flakes are arranged in parallel in the continuous resin phase to form a dense barrier layer structure. The penetration of the corrosive medium in the cured cement must go through numerous tortuous paths. Therefore, in a certain thickness of the corrosion-resistant layer, the distance of the corrosion penetration is greatly extended, which is equivalent to effectively increasing the thickness of the anti-corrosion layer.
The matrix resin used in scale cement is a high-performance vinyl ester resin, which has better corrosion resistance than epoxy resin. Since the matrix resin is an organic material, the life guarantee of flaky cement is 5-10 years. According to the actual operation of domestic desulfurization, the impact of temperature is a factor that needs to be carefully considered.
Scale cement has the characteristics of good impermeability, low construction difficulty, low repair cost and so on. Therefore, flake cement is widely used in flue gas desulfurization equipment. Power plant chimneys were used in the early days, but they are now less commonly used.
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