Abstract
| Original language | English |
|---|---|
| Title of host publication | BALTICA VI - Life management and maintenance for power plants. Vol. 1 |
| Place of Publication | Espoo |
| Publisher | VTT Technical Research Centre of Finland |
| Pages | 209-221 |
| ISBN (Electronic) | 951-38-6292-5 |
| ISBN (Print) | 951-38-6291-7 |
| Publication status | Published - 2004 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | BALTICA VI - Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland Duration: 8 Jun 2004 → 10 Jun 2004 |
Publication series
| Series | VTT Symposium |
|---|---|
| Number | 233 |
| ISSN | 0357-9387 |
Conference
| Conference | BALTICA VI - Life Management and Maintenance for Power Plants |
|---|---|
| Country | Finland |
| City | Helsinki-Stockholm |
| Period | 8/06/04 → 10/06/04 |
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Sulphidation attack of the heat transfer surfaces in boilers : Materials performance and views on future prospects. / Mäkipää, Martti; Baxter, David; Turunen, Erja; Oksa, Maria.
BALTICA VI - Life management and maintenance for power plants. Vol. 1. Espoo : VTT Technical Research Centre of Finland, 2004. p. 209-221 (VTT Symposium; No. 233).Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific
TY - GEN
T1 - Sulphidation attack of the heat transfer surfaces in boilers
T2 - Materials performance and views on future prospects
AU - Mäkipää, Martti
AU - Baxter, David
AU - Turunen, Erja
AU - Oksa, Maria
PY - 2004
Y1 - 2004
N2 - Sulphidation attack of the heat transfer surfaces in boilers may be due to the presence of reduced sulphur compounds in gaseous phase, or due to the result of adverse deposit conditions. Under reducing conditions in the furnace, the safe upper temperature limit of heat transfer surfaces made of low alloyed steels may be no more than about 300-330oC. The use of austenitic stainless steels or high chromium - high nickel alloys may allow metal temperatures that are 50 to 80 degrees or more higher. However, deposition of alkali and heavy metal salts may create corrosion conditions where protective chromium oxide or chromium sulphide scales fail. Materials design for the mixed fuel or high-pressure boilers must be considered carefully. High wastage rates of heat exchangers made of highly alloyed metallic materials or claddings may not be feasible for economic and environmental reasons. New developments in the manufacturing of austenitic stainless steels, however, may provide economic solutions for the superheater steel tubes. Corrosion resistant thermal spray coatings may fail due to their porous or discontinuous structure, or due to the thermal mismatch with the substrate. Prospective technologies based on the application of nanosized raw materials aiming to manufacture of gas-tight, temperature cycling resistant coatings are in the development stage.
AB - Sulphidation attack of the heat transfer surfaces in boilers may be due to the presence of reduced sulphur compounds in gaseous phase, or due to the result of adverse deposit conditions. Under reducing conditions in the furnace, the safe upper temperature limit of heat transfer surfaces made of low alloyed steels may be no more than about 300-330oC. The use of austenitic stainless steels or high chromium - high nickel alloys may allow metal temperatures that are 50 to 80 degrees or more higher. However, deposition of alkali and heavy metal salts may create corrosion conditions where protective chromium oxide or chromium sulphide scales fail. Materials design for the mixed fuel or high-pressure boilers must be considered carefully. High wastage rates of heat exchangers made of highly alloyed metallic materials or claddings may not be feasible for economic and environmental reasons. New developments in the manufacturing of austenitic stainless steels, however, may provide economic solutions for the superheater steel tubes. Corrosion resistant thermal spray coatings may fail due to their porous or discontinuous structure, or due to the thermal mismatch with the substrate. Prospective technologies based on the application of nanosized raw materials aiming to manufacture of gas-tight, temperature cycling resistant coatings are in the development stage.
M3 - Conference article in proceedings
SN - 951-38-6291-7
T3 - VTT Symposium
SP - 209
EP - 221
BT - BALTICA VI - Life management and maintenance for power plants. Vol. 1
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -