Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion

H Wu (Corresponding Author), M N Pedersen, J B Jespersen, Martti Aho, J Roppo, F J Frandsen, P Glarborg

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K2SO4 and HCl. In the present study, the rate constants for decomposition of ammonium sulfate and aluminum sulfate were obtained from experiments in a fast heating rate thermogravimetric analyzer. The yields of SO2 and SO3 from the decomposition were investigated in a tube reactor at 600-900 C, revealing a constant distribution of about 15% SO2 and 85% SO3 from aluminum sulfate decomposition and a temperature-dependent distribution of SO2 and SO3 from ammonium sulfate decomposition. On the basis of these data as well as earlier results, a detailed chemical kinetic model for sulfation of KCl by a range of sulfate additives was established. Modeling results were compared to biomass combustion experiments in a bubbling fluidized-bed reactor using ammonium sulfate, aluminum sulfate, and ferric sulfate as additives. The simulation results for ammonium sulfate and ferric sulfate addition compared favorably to the experiments. The predictions for aluminum sulfate addition were only partly in agreement with the experimental results, implying a need for further investigations. Predictions for the effectiveness of the sulfur-based additives indicate that ferric sulfate and ammonium sulfate have similar effectiveness at temperatures ranging from approximately 850 to 900 C, whereas ferric sulfate is more efficient at higher temperatures and ammonium sulfate is more effective at lower temperatures
Original languageEnglish
Pages (from-to)199-207
JournalEnergy & Fuels
Volume28
Issue number1
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed
Event4th Sino-Australian Symposium on Advanced Coal and Biomass Utilisation Technologies, 2013 - Wuhan, China
Duration: 9 Dec 201311 Dec 2013

Fingerprint

Potassium Chloride
Sulfates
Potassium
Ammonium Sulfate
Biomass
Decomposition
Ashes
Temperature
Experiments
Heating rate
Sulfur
Reaction kinetics
Fluidized beds
Boilers
Rate constants
Corrosion
Aluminum
aluminum sulfate
ferric sulfate

Cite this

Wu, H., Pedersen, M. N., Jespersen, J. B., Aho, M., Roppo, J., Frandsen, F. J., & Glarborg, P. (2014). Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion. Energy & Fuels, 28(1), 199-207. https://doi.org/10.1021/ef4015108
Wu, H ; Pedersen, M N ; Jespersen, J B ; Aho, Martti ; Roppo, J ; Frandsen, F J ; Glarborg, P. / Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion. In: Energy & Fuels. 2014 ; Vol. 28, No. 1. pp. 199-207.
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title = "Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion",
abstract = "Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K2SO4 and HCl. In the present study, the rate constants for decomposition of ammonium sulfate and aluminum sulfate were obtained from experiments in a fast heating rate thermogravimetric analyzer. The yields of SO2 and SO3 from the decomposition were investigated in a tube reactor at 600-900 C, revealing a constant distribution of about 15{\%} SO2 and 85{\%} SO3 from aluminum sulfate decomposition and a temperature-dependent distribution of SO2 and SO3 from ammonium sulfate decomposition. On the basis of these data as well as earlier results, a detailed chemical kinetic model for sulfation of KCl by a range of sulfate additives was established. Modeling results were compared to biomass combustion experiments in a bubbling fluidized-bed reactor using ammonium sulfate, aluminum sulfate, and ferric sulfate as additives. The simulation results for ammonium sulfate and ferric sulfate addition compared favorably to the experiments. The predictions for aluminum sulfate addition were only partly in agreement with the experimental results, implying a need for further investigations. Predictions for the effectiveness of the sulfur-based additives indicate that ferric sulfate and ammonium sulfate have similar effectiveness at temperatures ranging from approximately 850 to 900 C, whereas ferric sulfate is more efficient at higher temperatures and ammonium sulfate is more effective at lower temperatures",
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Wu, H, Pedersen, MN, Jespersen, JB, Aho, M, Roppo, J, Frandsen, FJ & Glarborg, P 2014, 'Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion', Energy & Fuels, vol. 28, no. 1, pp. 199-207. https://doi.org/10.1021/ef4015108

Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion. / Wu, H (Corresponding Author); Pedersen, M N; Jespersen, J B; Aho, Martti; Roppo, J; Frandsen, F J; Glarborg, P.

In: Energy & Fuels, Vol. 28, No. 1, 2014, p. 199-207.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Modeling the use of sulfate additives for potassium chloride destruction in biomass combustion

AU - Wu, H

AU - Pedersen, M N

AU - Jespersen, J B

AU - Aho, Martti

AU - Roppo, J

AU - Frandsen, F J

AU - Glarborg, P

PY - 2014

Y1 - 2014

N2 - Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K2SO4 and HCl. In the present study, the rate constants for decomposition of ammonium sulfate and aluminum sulfate were obtained from experiments in a fast heating rate thermogravimetric analyzer. The yields of SO2 and SO3 from the decomposition were investigated in a tube reactor at 600-900 C, revealing a constant distribution of about 15% SO2 and 85% SO3 from aluminum sulfate decomposition and a temperature-dependent distribution of SO2 and SO3 from ammonium sulfate decomposition. On the basis of these data as well as earlier results, a detailed chemical kinetic model for sulfation of KCl by a range of sulfate additives was established. Modeling results were compared to biomass combustion experiments in a bubbling fluidized-bed reactor using ammonium sulfate, aluminum sulfate, and ferric sulfate as additives. The simulation results for ammonium sulfate and ferric sulfate addition compared favorably to the experiments. The predictions for aluminum sulfate addition were only partly in agreement with the experimental results, implying a need for further investigations. Predictions for the effectiveness of the sulfur-based additives indicate that ferric sulfate and ammonium sulfate have similar effectiveness at temperatures ranging from approximately 850 to 900 C, whereas ferric sulfate is more efficient at higher temperatures and ammonium sulfate is more effective at lower temperatures

AB - Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K2SO4 and HCl. In the present study, the rate constants for decomposition of ammonium sulfate and aluminum sulfate were obtained from experiments in a fast heating rate thermogravimetric analyzer. The yields of SO2 and SO3 from the decomposition were investigated in a tube reactor at 600-900 C, revealing a constant distribution of about 15% SO2 and 85% SO3 from aluminum sulfate decomposition and a temperature-dependent distribution of SO2 and SO3 from ammonium sulfate decomposition. On the basis of these data as well as earlier results, a detailed chemical kinetic model for sulfation of KCl by a range of sulfate additives was established. Modeling results were compared to biomass combustion experiments in a bubbling fluidized-bed reactor using ammonium sulfate, aluminum sulfate, and ferric sulfate as additives. The simulation results for ammonium sulfate and ferric sulfate addition compared favorably to the experiments. The predictions for aluminum sulfate addition were only partly in agreement with the experimental results, implying a need for further investigations. Predictions for the effectiveness of the sulfur-based additives indicate that ferric sulfate and ammonium sulfate have similar effectiveness at temperatures ranging from approximately 850 to 900 C, whereas ferric sulfate is more efficient at higher temperatures and ammonium sulfate is more effective at lower temperatures

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