TY - JOUR
T1 - Influence of Deposit Formation on Corrosion at a Straw Fired boiler
AU - Hansen, Lone Aslaug
AU - Michelsen, Hanne Philbert
AU - Frandsen, Flemming
AU - Dam-Johansen, Kim
AU - Hørlyck, Steffen
AU - Karlsson, Asger
PY - 2000
Y1 - 2000
N2 - Straw-fired boilers generally experience severe problems with deposit formation and are expected to suffer from severe superheater corrosion at high steam temperatures due to the large alkali and chlorine content in straw. In this study, deposits collected (1) on air-cooled probes and (2) directly at the existing heat transfer surfaces of a straw-fired boiler have been examined. Deposits collected on air-cooled probes were found to consist of an inner layer of KCl and an outer layer of sintered fly ash. Ash deposits formed on the heat transfer surfaces all had a characteristic layered structure, with a dense layer of K2SO4 present adjacent to the metal surface. It is argued that the K2SO4 layer present adjacent to the metal surface may lead to reduced corrosion rates at this boiler. A discussion of the deposit structure, the K2SO4 layer formation mechanism, and the influence of the inner layer composition on the corrosion of the superheaters is provided. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - Straw-fired boilers generally experience severe problems with deposit formation and are expected to suffer from severe superheater corrosion at high steam temperatures due to the large alkali and chlorine content in straw. In this study, deposits collected (1) on air-cooled probes and (2) directly at the existing heat transfer surfaces of a straw-fired boiler have been examined. Deposits collected on air-cooled probes were found to consist of an inner layer of KCl and an outer layer of sintered fly ash. Ash deposits formed on the heat transfer surfaces all had a characteristic layered structure, with a dense layer of K2SO4 present adjacent to the metal surface. It is argued that the K2SO4 layer present adjacent to the metal surface may lead to reduced corrosion rates at this boiler. A discussion of the deposit structure, the K2SO4 layer formation mechanism, and the influence of the inner layer composition on the corrosion of the superheaters is provided. (C) 2000 Elsevier Science B.V. All rights reserved.
U2 - 10.1016/S0378-3820(00)00063-1
DO - 10.1016/S0378-3820(00)00063-1
M3 - Journal article
SN - 0378-3820
VL - 64
SP - 189
EP - 209
JO - Fuel Processing Technology
JF - Fuel Processing Technology
IS - 1-3
ER -