TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

Markus Engblom; Daniel Kristoffer Lindberg; Patrik Yrjas; Jonne Kristian Niemi; Tor Laurén; Mikko Hupa

TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

Markus Engblom, Daniel Kristoffer Lindberg, Patrik Yrjas, Jonne Kristian Niemi, Tor Laurén, Mikko Hupa

Forskningsoutput: Kapitel i bok/konferenshandling › Konferensbidrag › Vetenskaplig

Sammanfattning

This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel. Experiments using salt mixtures of NaCl/Na₂SO₄ or KCl/K₂SO₄ show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface. The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature. Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion. The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl. Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.

Originalspråk	Odefinierat/okänt
Titel på värdpublikation	11th International Conference on Fluidized Bed Technology, CFB-11
Redaktörer	Li Jinghai, Fei Wei, Xiaojun Bao, Wei Wang
Förlag	Institute of Process Engineering, Chinese Academy of Sciences
Sidor	–
Status	Publicerad - 2014
MoE-publikationstyp	B3 Ej refererad artikel i konferenshandlingar
Evenemang	conference; 2014-05-14; 2014-05-17 - Beijing, China Varaktighet: 14 maj 2014 → 17 maj 2014

Konferens

Konferens	conference; 2014-05-14; 2014-05-17
Period	14/05/14 → 17/05/14

Nyckelord

Alkali chloride induced corrosion
corrosion
high-temperature corrosion
lab-scale corrosion measurements

Citera det här

@inproceedings{6112fcd4f98b4dba9bcfe05b55170a59,

title = "TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION",

abstract = "This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel. Experiments using salt mixtures of NaCl/Na2SO4 or KCl/K2SO4 show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface. The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature. Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion. The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl. Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.",

keywords = "Alkali chloride induced corrosion, corrosion, high-temperature corrosion, lab-scale corrosion measurements, Alkali chloride induced corrosion, corrosion, high-temperature corrosion, lab-scale corrosion measurements, Alkali chloride induced corrosion, corrosion, high-temperature corrosion, lab-scale corrosion measurements",

author = "Markus Engblom and Lindberg, {Daniel Kristoffer} and Patrik Yrjas and Niemi, {Jonne Kristian} and Tor Laur{\'e}n and Mikko Hupa",

year = "2014",

language = "Odefinierat/ok{\"a}nt",

pages = "–",

editor = "Li Jinghai and Fei Wei and Xiaojun Bao and Wei Wang",

booktitle = "11th International Conference on Fluidized Bed Technology, CFB-11",

publisher = "Institute of Process Engineering, Chinese Academy of Sciences",

note = "null ; Conference date: 14-05-2014 Through 17-05-2014",

}

Engblom, M, Lindberg, DK, Yrjas, P , Niemi, JK , Laurén, T & Hupa, M 2014, TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION. i L Jinghai, F Wei, X Bao & W Wang (red), 11th International Conference on Fluidized Bed Technology, CFB-11. Institute of Process Engineering, Chinese Academy of Sciences, s. –, conference; 2014-05-14; 2014-05-17, 14/05/14.

TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION. / Engblom, Markus; Lindberg, Daniel Kristoffer; Yrjas, Patrik et al.

11th International Conference on Fluidized Bed Technology, CFB-11. red. / Li Jinghai; Fei Wei; Xiaojun Bao; Wei Wang. Institute of Process Engineering, Chinese Academy of Sciences, 2014. s. –.

Forskningsoutput: Kapitel i bok/konferenshandling › Konferensbidrag › Vetenskaplig

TY - GEN

T1 - TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

AU - Engblom, Markus

AU - Lindberg, Daniel Kristoffer

AU - Yrjas, Patrik

AU - Niemi, Jonne Kristian

AU - Laurén, Tor

AU - Hupa, Mikko

PY - 2014

Y1 - 2014

N2 - This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel. Experiments using salt mixtures of NaCl/Na2SO4 or KCl/K2SO4 show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface. The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature. Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion. The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl. Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.

AB - This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel. Experiments using salt mixtures of NaCl/Na2SO4 or KCl/K2SO4 show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface. The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature. Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion. The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl. Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.

KW - Alkali chloride induced corrosion

KW - corrosion

KW - high-temperature corrosion

KW - lab-scale corrosion measurements

KW - Alkali chloride induced corrosion

KW - corrosion

KW - high-temperature corrosion

KW - lab-scale corrosion measurements

KW - Alkali chloride induced corrosion

KW - corrosion

KW - high-temperature corrosion

KW - lab-scale corrosion measurements

M3 - Konferensbidrag

SP - –

BT - 11th International Conference on Fluidized Bed Technology, CFB-11

A2 - Jinghai, Li

A2 - Wei, Fei

A2 - Bao, Xiaojun

A2 - Wang, Wei

PB - Institute of Process Engineering, Chinese Academy of Sciences

Y2 - 14 May 2014 through 17 May 2014

ER -