Reduction of superheater corrosion by co-firing risky biomass with sewage sludge

Martti Aho (Corresponding Author), P. Yrjas, Raili Taipale, M. Hupa, J. Silvennoinen

Research output: Contribution to journalArticleScientificpeer-review

56 Citations (Scopus)

Abstract

Iron and aluminium sulphates are added to processes producing sewage sludge (SWS), and SWS also contains aluminium silicates. These compounds can destroy alkali chlorides and prevent Cl deposition on superheaters. Sulphation of chlorides requires formation of SO3 in the furnace. Raw and digested SWSs were mixed with a fuel containing bark and recycled fuel (REF). Combustion experiments were conducted with a pilot-scale bubbling bed reactor, and concentrations and deposition of critical elements (Cl, Na, K, S…) in the furnace were measured. Change of the iron and aluminium sulphates added to the SWS to phosphates and hydroxides evidently reduced the power of the sulphur to form SO3. Nevertheless, addition of SWS to the biomass feedstock effectively decreased alkali chloride concentration and Cl deposition, and the alkali sulphates found in the fine fly ash confirmed the contribution of sulphation to alkali capture. The importance of aluminium silicate reaction in alkali capture was indicated.
Original languageEnglish
Pages (from-to)2376-2386
Number of pages11
JournalFuel
Volume89
Issue number9
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Fingerprint

Superheaters
Sewage sludge
Alkalies
Biomass
Corrosion
Aluminum Silicates
Aluminum
Chlorides
Silicates
Furnaces
Iron
Hydroxides
Coal Ash
Fly ash
Feedstocks
Phosphates
Sulfur
Sulfates
Experiments

Keywords

  • Co-combustion
  • corrosion
  • sewage sludge

Cite this

Aho, M., Yrjas, P., Taipale, R., Hupa, M., & Silvennoinen, J. (2010). Reduction of superheater corrosion by co-firing risky biomass with sewage sludge. Fuel, 89(9), 2376-2386. https://doi.org/10.1016/j.fuel.2010.01.023
Aho, Martti ; Yrjas, P. ; Taipale, Raili ; Hupa, M. ; Silvennoinen, J. / Reduction of superheater corrosion by co-firing risky biomass with sewage sludge. In: Fuel. 2010 ; Vol. 89, No. 9. pp. 2376-2386.
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title = "Reduction of superheater corrosion by co-firing risky biomass with sewage sludge",
abstract = "Iron and aluminium sulphates are added to processes producing sewage sludge (SWS), and SWS also contains aluminium silicates. These compounds can destroy alkali chlorides and prevent Cl deposition on superheaters. Sulphation of chlorides requires formation of SO3 in the furnace. Raw and digested SWSs were mixed with a fuel containing bark and recycled fuel (REF). Combustion experiments were conducted with a pilot-scale bubbling bed reactor, and concentrations and deposition of critical elements (Cl, Na, K, S…) in the furnace were measured. Change of the iron and aluminium sulphates added to the SWS to phosphates and hydroxides evidently reduced the power of the sulphur to form SO3. Nevertheless, addition of SWS to the biomass feedstock effectively decreased alkali chloride concentration and Cl deposition, and the alkali sulphates found in the fine fly ash confirmed the contribution of sulphation to alkali capture. The importance of aluminium silicate reaction in alkali capture was indicated.",
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Aho, M, Yrjas, P, Taipale, R, Hupa, M & Silvennoinen, J 2010, 'Reduction of superheater corrosion by co-firing risky biomass with sewage sludge', Fuel, vol. 89, no. 9, pp. 2376-2386. https://doi.org/10.1016/j.fuel.2010.01.023

Reduction of superheater corrosion by co-firing risky biomass with sewage sludge. / Aho, Martti (Corresponding Author); Yrjas, P.; Taipale, Raili; Hupa, M.; Silvennoinen, J.

In: Fuel, Vol. 89, No. 9, 2010, p. 2376-2386.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Reduction of superheater corrosion by co-firing risky biomass with sewage sludge

AU - Aho, Martti

AU - Yrjas, P.

AU - Taipale, Raili

AU - Hupa, M.

AU - Silvennoinen, J.

PY - 2010

Y1 - 2010

N2 - Iron and aluminium sulphates are added to processes producing sewage sludge (SWS), and SWS also contains aluminium silicates. These compounds can destroy alkali chlorides and prevent Cl deposition on superheaters. Sulphation of chlorides requires formation of SO3 in the furnace. Raw and digested SWSs were mixed with a fuel containing bark and recycled fuel (REF). Combustion experiments were conducted with a pilot-scale bubbling bed reactor, and concentrations and deposition of critical elements (Cl, Na, K, S…) in the furnace were measured. Change of the iron and aluminium sulphates added to the SWS to phosphates and hydroxides evidently reduced the power of the sulphur to form SO3. Nevertheless, addition of SWS to the biomass feedstock effectively decreased alkali chloride concentration and Cl deposition, and the alkali sulphates found in the fine fly ash confirmed the contribution of sulphation to alkali capture. The importance of aluminium silicate reaction in alkali capture was indicated.

AB - Iron and aluminium sulphates are added to processes producing sewage sludge (SWS), and SWS also contains aluminium silicates. These compounds can destroy alkali chlorides and prevent Cl deposition on superheaters. Sulphation of chlorides requires formation of SO3 in the furnace. Raw and digested SWSs were mixed with a fuel containing bark and recycled fuel (REF). Combustion experiments were conducted with a pilot-scale bubbling bed reactor, and concentrations and deposition of critical elements (Cl, Na, K, S…) in the furnace were measured. Change of the iron and aluminium sulphates added to the SWS to phosphates and hydroxides evidently reduced the power of the sulphur to form SO3. Nevertheless, addition of SWS to the biomass feedstock effectively decreased alkali chloride concentration and Cl deposition, and the alkali sulphates found in the fine fly ash confirmed the contribution of sulphation to alkali capture. The importance of aluminium silicate reaction in alkali capture was indicated.

KW - Co-combustion

KW - corrosion

KW - sewage sludge

U2 - 10.1016/j.fuel.2010.01.023

DO - 10.1016/j.fuel.2010.01.023

M3 - Article

VL - 89

SP - 2376

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JO - Fuel

JF - Fuel

SN - 0016-2361

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ER -