α-2000 Special Anticorrosive Coating for Rotary Kiln
Severe corrosion and brittle fractures of carbon fiber take place at high temperature on metal shell of rotary kilns when harmful gas (like oxides, Sulphur, and chloride ion phosphide) is in contact with the metal shell via firebrick lining. The harmful gas is generated from solid and hazardous wastes co-processed with calcined materials and fuels in cement kilns.
Characteristics of the α-2000 Special Anticorrosive Coating for Rotary Kiln
♦It can take effect in a high temperature at 800 degrees Celsius for a long time, which lives up to the working conditions of rotary kiln.
♦Flaky graphite in regular shape can be added to lubricate the kiln cylinder at high temperature. It helps fire-resistant bricks and kiln cylinder to rotate smoothly. The graphite can also improve electric conductivity and prevent electric potential difference due to static build-up, and reduce electrochemical corrosion.
♦Fused alumina powder can be added to increase its wear-proof performance.
♦Inorganic resin and inorganic non-metal inert oxide pigments and fillers have low tension and can avoid shrank edges in continuous coating. They can effectively block the contact between harmful gas and metal so as to avoid corrosion and oxidation of kiln cylinder.
♦The coating is only 1 mm thick after coating, which will not influence the stable performance of burned bricks.
- The blackness of water-cooled wall is improved from 0.7 to 0.93, and the heat gain of inner wall of metal tubes rises at 7.89 percent.
- This coating enhances the heat gain and load capacity of furnace chamber, lowers the gas temperature of furnace exit, reduces the temperature-decreasing water flow of super-heater and reheater.
- This coating slows down the conductive heat release of molten ash particle to pipe wall, because of its low heat transfer coefficient only as much as one third of that of metal.
- The molten scorched particle is hard to be attached to heat-absorbing surface, which slows down the tarnishing of water-cooled wall.
Item | Testing Standard | Performance Parameter |
Conditions in furnace | GB 9755-2001 5.3 | Welldistributed, no agglomeration, flocculent, sedimentary |
Colour | GB/T 1722-1992 | Gray |
Adhesive force | GB/T 9286-1998 | 1 |
Flxibility | GB/T 1731-93 | 4mm |
Coating hardness | GB/T 6739-2006 | 5H |
IR emissivity | GJB 5023.2-2003 | 0.95 |
Salt spray test after being heated (24h) | HG/T 4565-2013 | No frothing. no flling off, no cracking, no rust |
Oxidation capability | HG/T 4565-2013 | Non-corrosive, no obvious oxidation colour |
Recommended coating thickness | ||
Coating thickness and spreading rate | Dry film thickness(μm) | Theorelical spreading rate (m2kg) |
Constant | 200 | 2.0 |
Applications in Air Heater
♦The thermal capacity of air heat rises by 12.7 percent, and the compression strength and high-temperature creep resistant physical and chemical performance of checker bricks and regenerative balls are improved.
♦The thermal shock resistance is enhanced, with strengthened anticorrosion, smoke protection of checker bricks and regenerative balls, as well as lengthened service life.
Analysis of Corrosion Environment of Clinker Production Line
1.Alkali Corrosion: The cement is alkaline (at PH10-12); Under-deposit corrosion; Ammonia corrosion after denitrification.
2.Corrosion due to dewing: High humidity and dew point; Corrosion due to dewing; Accelerated corrosion in high temperature.
3.Invalid anticorrosive coating: Weak anticorrosion and penetration resistance of common coating material; Nondurable to temperature variation; Protection layer destroyed by corrosion.
4.High-temperature corrosion: Flue-gas temperature at 90–200 degrees Celsius; Accelerated oxidation in high temperature.
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