High-temperature corrosion due to lead chloride mixtures simulating fireside deposits in boilers firing recycled wood
| Autor: | Patrik Yrjas, Sonja Enestam, Mikko Uusitalo, Daniel Lindberg, Dorota Bankiewicz, Tor Laurén, Hanna Kinnunen |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
020209 energy General Chemical Engineering Lead chloride High-temperature corrosion Metallurgy Alloy steel Energy Engineering and Power Technology 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Combustion Isothermal process Corrosion Fuel Technology 13. Climate action Phase (matter) Heat transfer 0202 electrical engineering electronic engineering information engineering engineering 0210 nano-technology |
| Zdroj: | Fuel Processing Technology. 167:306-313 |
| ISSN: | 0378-3820 |
| DOI: | 10.1016/j.fuproc.2017.07.017 |
| Popis: | One of the biggest operational concerns in recycled wood combustion, is the risk for formation of low melting, corrosive deposits. The deposits present on low-temperature heat transfer surfaces (material temperature K 2 SO 4 is commonly regarded as non-corrosive, but there have been indications that K 2 SO 4 may worsen the PbCl 2 induced corrosion. Consequently, a more detailed study with these compounds was of very high interest. This paper reports the results obtained from 24-hour isothermal laboratory corrosion tests with PbCl 2 mixed with either K 2 SO 4 or SiO 2 . The tests were carried out at 350 °C using low alloy steel (16Mo3). The interaction between PbCl 2 and K 2 SO 4 was investigated in a furnace with a temperature gradient. As a result, a mixture of PbCl 2 and K 2 SO 4 is more corrosive than PbCl 2 mixed with SiO 2 . Corrosion was noticed below the deposit's first melting temperature. However, for a mixture of FeCl 2 , KCl and PbCl 2 , the first melting temperature is below 350 °C which could explain the high oxidation rate observed below the first melting temperature of the deposit. A solid phase or a mixture of phases with the composition of K 3 Pb 2 (SO 4 ) 3 Cl was observed in the tests with SEM/EDX for the first time. |
| Databáze: | OpenAIRE |
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