Reduction of chlorine deposition in FB boilers with aluminium-containing additives

Martti Aho (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

59 Citations (Scopus)

Abstract

Chlorine-containing fuels tend to form corrosive deposits on the heat transfer surfaces of boiler furnaces. High risk chlorine compounds are of type MCl, where M is Na or K. Experiments were performed with an electrically stabilised 20 kW bubbling bed reactor to determine the concentrations of Cl compounds in deposits and fine fly ash. The fuels of interest were fir bark and agricultural waste, fir bark and plastic waste, and forest residue. Deposits were collected on superheater tube simulators with controlled surface temperatures. Kaolin (hydrous 40:60 wt% Al2O3∗ SiO2) sharply decreased the tendency of Cl to bind in the deposits at high metal temperatures. Minimum kaolin dosage needed to decrease the Cl concentration in deposits collected at 500°C to the same level as in the main fuel (fir bark) was 30–50 wt% of the mass flow of the fuel ash. Kaolin did not prevent Cl from depositing at probe temperature of 400°C, where high-temperature corrosion is not a problem. The presence of other elements in the kaolin (e.g. Fe and Ca) increased the required dosage.

Original languageEnglish
Pages (from-to)1943-1951
Number of pages9
JournalFuel
Volume80
Issue number13
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Fingerprint

Chlorine
Kaolin
Aluminum
Boilers
Deposits
Ashes
Chlorine Compounds
Superheater tubes
Coal Ash
Caustics
Temperature
Agricultural wastes
Chlorine compounds
Fly ash
Furnaces
Simulators
Metals
Corrosion
Plastics
Heat transfer

Keywords

  • chlorine compounds
  • deposition
  • boilers
  • fluidized bed combustion
  • fluidized beds
  • additives
  • aluminium

Cite this

Aho, Martti. / Reduction of chlorine deposition in FB boilers with aluminium-containing additives. In: Fuel. 2001 ; Vol. 80, No. 13. pp. 1943-1951.
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title = "Reduction of chlorine deposition in FB boilers with aluminium-containing additives",
abstract = "Chlorine-containing fuels tend to form corrosive deposits on the heat transfer surfaces of boiler furnaces. High risk chlorine compounds are of type MCl, where M is Na or K. Experiments were performed with an electrically stabilised 20 kW bubbling bed reactor to determine the concentrations of Cl compounds in deposits and fine fly ash. The fuels of interest were fir bark and agricultural waste, fir bark and plastic waste, and forest residue. Deposits were collected on superheater tube simulators with controlled surface temperatures. Kaolin (hydrous 40:60 wt{\%} Al2O3∗ SiO2) sharply decreased the tendency of Cl to bind in the deposits at high metal temperatures. Minimum kaolin dosage needed to decrease the Cl concentration in deposits collected at 500°C to the same level as in the main fuel (fir bark) was 30–50 wt{\%} of the mass flow of the fuel ash. Kaolin did not prevent Cl from depositing at probe temperature of 400°C, where high-temperature corrosion is not a problem. The presence of other elements in the kaolin (e.g. Fe and Ca) increased the required dosage.",
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Reduction of chlorine deposition in FB boilers with aluminium-containing additives. / Aho, Martti (Corresponding Author).

In: Fuel, Vol. 80, No. 13, 2001, p. 1943-1951.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Reduction of chlorine deposition in FB boilers with aluminium-containing additives

AU - Aho, Martti

PY - 2001

Y1 - 2001

N2 - Chlorine-containing fuels tend to form corrosive deposits on the heat transfer surfaces of boiler furnaces. High risk chlorine compounds are of type MCl, where M is Na or K. Experiments were performed with an electrically stabilised 20 kW bubbling bed reactor to determine the concentrations of Cl compounds in deposits and fine fly ash. The fuels of interest were fir bark and agricultural waste, fir bark and plastic waste, and forest residue. Deposits were collected on superheater tube simulators with controlled surface temperatures. Kaolin (hydrous 40:60 wt% Al2O3∗ SiO2) sharply decreased the tendency of Cl to bind in the deposits at high metal temperatures. Minimum kaolin dosage needed to decrease the Cl concentration in deposits collected at 500°C to the same level as in the main fuel (fir bark) was 30–50 wt% of the mass flow of the fuel ash. Kaolin did not prevent Cl from depositing at probe temperature of 400°C, where high-temperature corrosion is not a problem. The presence of other elements in the kaolin (e.g. Fe and Ca) increased the required dosage.

AB - Chlorine-containing fuels tend to form corrosive deposits on the heat transfer surfaces of boiler furnaces. High risk chlorine compounds are of type MCl, where M is Na or K. Experiments were performed with an electrically stabilised 20 kW bubbling bed reactor to determine the concentrations of Cl compounds in deposits and fine fly ash. The fuels of interest were fir bark and agricultural waste, fir bark and plastic waste, and forest residue. Deposits were collected on superheater tube simulators with controlled surface temperatures. Kaolin (hydrous 40:60 wt% Al2O3∗ SiO2) sharply decreased the tendency of Cl to bind in the deposits at high metal temperatures. Minimum kaolin dosage needed to decrease the Cl concentration in deposits collected at 500°C to the same level as in the main fuel (fir bark) was 30–50 wt% of the mass flow of the fuel ash. Kaolin did not prevent Cl from depositing at probe temperature of 400°C, where high-temperature corrosion is not a problem. The presence of other elements in the kaolin (e.g. Fe and Ca) increased the required dosage.

KW - chlorine compounds

KW - deposition

KW - boilers

KW - fluidized bed combustion

KW - fluidized beds

KW - additives

KW - aluminium

U2 - 10.1016/S0016-2361(01)00049-7

DO - 10.1016/S0016-2361(01)00049-7

M3 - Article

VL - 80

SP - 1943

EP - 1951

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 13

ER -