Title:
Minimising Corrosion and Deposit Formation during Biomass Combustion by Sulphate-containing Additives
Author(s):
Kassman, H., Alin, J., Berg, M.
Document(s):
Paper
Poster
Abstract:
Combustion of a biomass with an enhanced content of chlorine (Cl) can result in operational problems including deposit formation and superheater corrosion. High levels of alkali chlorides (KCl during biomass) in the flue gas can enhance deposit formation and a high content of KCl in the deposits may accelerate superheater corrosion. The strategies applied to reduce such problems include the use of sulphur-containing additives. This paper describes application of the so-called ChlorOut concept. It consists of IACM (in-situ alkali chloride monitor), a measurement device for gaseous KCl, and a sulphate-containing additive for reduction of gaseous KCl. IACM enabled control of the required amount of additive (ammonium sulphate as well as on-line quality control of the incoming fuel mix by measuring the concentration of KCl. The results revealed that injection of ammonium sulphate reduced KCl, and lowered chlorine and increased sulphur in deposits. Consequently, the risk of corrosion was decreased. Operational problems from deposit formation and superheater corrosion during combustion of biomass can be minimised by injection of a sulphate-containing additives according to the ChlorOut concept.
Keywords:
biomass, corrosion, additives
Topic:
R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Solid biofuel combustion in large utilities
Event:
21st European Biomass Conference and Exhibition
Session:
2DV.3.54
Pages:
1186 - 1188
ISBN:
978-88-89407-53-0
Paper DOI:
10.5071/21stEUBCE2013-2DV.3.54
Price:
FREE
