Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters

Martti Aho (Corresponding Author), Pasi Vainikka, Raili Taipale, Patrik Yrjas

Research output: Contribution to journalArticleScientificpeer-review

58 Citations (Scopus)

Abstract

Firing or co-firing of biomass in efficient power plants can lead to high-temperature corrosion of superheaters due to condensation of alkali chlorides into superheater deposits. Corrosion can be prevented if a significant portion of the alkali chlorides present in the flue gases is destroyed before reaching the superheaters. The alkali capturing power of aluminium and ferric sulphates was determined in a pilot-scale fluidised bed (FB) reactor. The reagents were added in solution, through a spraying nozzle, to the upper part of the freeboard. Both reagents, at economical dosages, fast and effectively destroyed the alkali chlorides by producing sufficient SO3 for the sulphation. Both the mass flow rate and type of sulphate affected the sulphation ability. Thus, the cation, too, plays a role in the reaction. The required chemical dosage is not directly proportional to the Sreagent/Cl2fuel ratio because alkali chlorides must compete with calcium and magnesium oxides and probably also with alkali oxides for the available SO3.
Original languageEnglish
Pages (from-to)647 - 654
Number of pages8
JournalFuel
Volume87
Issue number6
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Superheaters
Chlorine
Alkalies
Boiler firing
Power plants
Corrosion
Chlorides
Magnesia
Spraying
Flue gases
Lime
Condensation
Nozzles
Biomass
Deposits
Positive ions
Magnesium Oxide
Flow rate
Aluminum
Oxides

Keywords

  • Combustion
  • Fluidised bed
  • Corrosion
  • Chlorine

Cite this

Aho, Martti ; Vainikka, Pasi ; Taipale, Raili ; Yrjas, Patrik. / Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters. In: Fuel. 2008 ; Vol. 87, No. 6. pp. 647 - 654.
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title = "Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters",
abstract = "Firing or co-firing of biomass in efficient power plants can lead to high-temperature corrosion of superheaters due to condensation of alkali chlorides into superheater deposits. Corrosion can be prevented if a significant portion of the alkali chlorides present in the flue gases is destroyed before reaching the superheaters. The alkali capturing power of aluminium and ferric sulphates was determined in a pilot-scale fluidised bed (FB) reactor. The reagents were added in solution, through a spraying nozzle, to the upper part of the freeboard. Both reagents, at economical dosages, fast and effectively destroyed the alkali chlorides by producing sufficient SO3 for the sulphation. Both the mass flow rate and type of sulphate affected the sulphation ability. Thus, the cation, too, plays a role in the reaction. The required chemical dosage is not directly proportional to the Sreagent/Cl2fuel ratio because alkali chlorides must compete with calcium and magnesium oxides and probably also with alkali oxides for the available SO3.",
keywords = "Combustion, Fluidised bed, Corrosion, Chlorine",
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Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters. / Aho, Martti (Corresponding Author); Vainikka, Pasi; Taipale, Raili; Yrjas, Patrik.

In: Fuel, Vol. 87, No. 6, 2008, p. 647 - 654.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters

AU - Aho, Martti

AU - Vainikka, Pasi

AU - Taipale, Raili

AU - Yrjas, Patrik

PY - 2008

Y1 - 2008

N2 - Firing or co-firing of biomass in efficient power plants can lead to high-temperature corrosion of superheaters due to condensation of alkali chlorides into superheater deposits. Corrosion can be prevented if a significant portion of the alkali chlorides present in the flue gases is destroyed before reaching the superheaters. The alkali capturing power of aluminium and ferric sulphates was determined in a pilot-scale fluidised bed (FB) reactor. The reagents were added in solution, through a spraying nozzle, to the upper part of the freeboard. Both reagents, at economical dosages, fast and effectively destroyed the alkali chlorides by producing sufficient SO3 for the sulphation. Both the mass flow rate and type of sulphate affected the sulphation ability. Thus, the cation, too, plays a role in the reaction. The required chemical dosage is not directly proportional to the Sreagent/Cl2fuel ratio because alkali chlorides must compete with calcium and magnesium oxides and probably also with alkali oxides for the available SO3.

AB - Firing or co-firing of biomass in efficient power plants can lead to high-temperature corrosion of superheaters due to condensation of alkali chlorides into superheater deposits. Corrosion can be prevented if a significant portion of the alkali chlorides present in the flue gases is destroyed before reaching the superheaters. The alkali capturing power of aluminium and ferric sulphates was determined in a pilot-scale fluidised bed (FB) reactor. The reagents were added in solution, through a spraying nozzle, to the upper part of the freeboard. Both reagents, at economical dosages, fast and effectively destroyed the alkali chlorides by producing sufficient SO3 for the sulphation. Both the mass flow rate and type of sulphate affected the sulphation ability. Thus, the cation, too, plays a role in the reaction. The required chemical dosage is not directly proportional to the Sreagent/Cl2fuel ratio because alkali chlorides must compete with calcium and magnesium oxides and probably also with alkali oxides for the available SO3.

KW - Combustion

KW - Fluidised bed

KW - Corrosion

KW - Chlorine

U2 - 10.1016/j.fuel.2007.05.033

DO - 10.1016/j.fuel.2007.05.033

M3 - Article

VL - 87

SP - 647

EP - 654

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 6

ER -