Abstract
Accumulation of fireside deposits on heat transfer tube surfaces is a persistent problem in the kraft recovery boiler operation. In a given boiler, the deposit composition varies with location. Even at a given location, the composition varies across the deposit layer. This study systematically studies what makes the deposit compositions heterogeneous. An entrained flow reactor with an air-cooled probe was used to collect and age synthetic deposits. Results confirm NaCl and KCl migration towards colder temperatures due to evaporation-condensation. In addition, liquid phase movement towards the colder temperatures was confirmed. High alkali chloride melt penetrates the deposit and precipitates in colder temperatures leading to enrichment of corrosive alkali chloride species close to the steel. The results imply that liquid phase movement within recovery boiler deposits can accelerate corrosion.
| Original language | Undefined/Unknown |
|---|---|
| Title of host publication | Proceedings International Chemical Recovery Conference 2017 |
| Publisher | Pulp and Paper Technical Association of Canada |
| Pages | – |
| ISBN (Print) | 9781772890037 |
| Publication status | Published - 2017 |
| MoE publication type | A4 Article in a conference publication |
| Event | International Chemical Recovery Conference (ICRC) - International Chemical Recovery Conference, ICRC 2017 Duration: 24 May 2017 → 26 May 2017 |
Conference
| Conference | International Chemical Recovery Conference (ICRC) |
|---|---|
| Period | 24/05/17 → 26/05/17 |
Keywords
- aging
- composition
- molten salt
- recovery boiler