Potassium capture by coal fly ash K2CO3, KCl and K2SO4

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The potassium capture behavior of two coal fly ashes at well-controlled suspension-fired conditions was investigated through entrained flow reactor (EFR) experiments and chemical equilibrium calculations. The impact of local reaction conditions, i.e., the type of K-salts (K2CO3, KCl or K2SO4), K-concentration in flue gas (molar K/(Al + Si) ratio in reactants), reaction temperature, and coal ash type on the reaction was studied. The results show that the K-capture level of coal fly ash at a K-concentration of 500 ppmv (K/(Si + Al) = 0.481) was considerably lower than the equilibrium data as well as the measured K-capture level of kaolin. However, at 50 ppmv K (with a molar K/(Si + Al) ration of 0.048), no obvious difference between kaolin and coal fly ash was observed in this work. Comparison of results for different K-species showed that coal fly ash captured KOH and K2CO3 more effectively than KCl and K2SO4. Additionally, a coal fly ash with higher content of Si and a lower melting point captured KCl more effectively than the reference coal fly ash.

Original languageEnglish
Article number106115
JournalFuel Processing Technology
Volume194
Number of pages11
ISSN0378-3820
DOIs
Publication statusPublished - 2019

Keywords

  • Additive
  • Biomass combustion
  • Coal fly ash
  • K2CO3
  • KCl
  • Potassium capture

Cite this

@article{c0bf7dcd42b74270a168e2482b060040,
title = "Potassium capture by coal fly ash K2CO3, KCl and K2SO4",
abstract = "The potassium capture behavior of two coal fly ashes at well-controlled suspension-fired conditions was investigated through entrained flow reactor (EFR) experiments and chemical equilibrium calculations. The impact of local reaction conditions, i.e., the type of K-salts (K2CO3, KCl or K2SO4), K-concentration in flue gas (molar K/(Al + Si) ratio in reactants), reaction temperature, and coal ash type on the reaction was studied. The results show that the K-capture level of coal fly ash at a K-concentration of 500 ppmv (K/(Si + Al) = 0.481) was considerably lower than the equilibrium data as well as the measured K-capture level of kaolin. However, at 50 ppmv K (with a molar K/(Si + Al) ration of 0.048), no obvious difference between kaolin and coal fly ash was observed in this work. Comparison of results for different K-species showed that coal fly ash captured KOH and K2CO3 more effectively than KCl and K2SO4. Additionally, a coal fly ash with higher content of Si and a lower melting point captured KCl more effectively than the reference coal fly ash.",
keywords = "Additive, Biomass combustion, Coal fly ash, K2CO3, KCl, Potassium capture",
author = "Guoliang Wang and Jensen, {Peter Arendt} and Hao Wu and Frandsen, {Flemming Jappe} and Yashasvi Laxminarayan and Bo Sander and Peter Glarborg",
year = "2019",
doi = "10.1016/j.fuproc.2019.05.038",
language = "English",
volume = "194",
journal = "Fuel Processing Technology",
issn = "0378-3820",
publisher = "Elsevier",

}

Potassium capture by coal fly ash K2CO3, KCl and K2SO4. / Wang, Guoliang; Jensen, Peter Arendt; Wu, Hao; Frandsen, Flemming Jappe; Laxminarayan, Yashasvi; Sander, Bo; Glarborg, Peter.

In: Fuel Processing Technology, Vol. 194, 106115, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Potassium capture by coal fly ash K2CO3, KCl and K2SO4

AU - Wang, Guoliang

AU - Jensen, Peter Arendt

AU - Wu, Hao

AU - Frandsen, Flemming Jappe

AU - Laxminarayan, Yashasvi

AU - Sander, Bo

AU - Glarborg, Peter

PY - 2019

Y1 - 2019

N2 - The potassium capture behavior of two coal fly ashes at well-controlled suspension-fired conditions was investigated through entrained flow reactor (EFR) experiments and chemical equilibrium calculations. The impact of local reaction conditions, i.e., the type of K-salts (K2CO3, KCl or K2SO4), K-concentration in flue gas (molar K/(Al + Si) ratio in reactants), reaction temperature, and coal ash type on the reaction was studied. The results show that the K-capture level of coal fly ash at a K-concentration of 500 ppmv (K/(Si + Al) = 0.481) was considerably lower than the equilibrium data as well as the measured K-capture level of kaolin. However, at 50 ppmv K (with a molar K/(Si + Al) ration of 0.048), no obvious difference between kaolin and coal fly ash was observed in this work. Comparison of results for different K-species showed that coal fly ash captured KOH and K2CO3 more effectively than KCl and K2SO4. Additionally, a coal fly ash with higher content of Si and a lower melting point captured KCl more effectively than the reference coal fly ash.

AB - The potassium capture behavior of two coal fly ashes at well-controlled suspension-fired conditions was investigated through entrained flow reactor (EFR) experiments and chemical equilibrium calculations. The impact of local reaction conditions, i.e., the type of K-salts (K2CO3, KCl or K2SO4), K-concentration in flue gas (molar K/(Al + Si) ratio in reactants), reaction temperature, and coal ash type on the reaction was studied. The results show that the K-capture level of coal fly ash at a K-concentration of 500 ppmv (K/(Si + Al) = 0.481) was considerably lower than the equilibrium data as well as the measured K-capture level of kaolin. However, at 50 ppmv K (with a molar K/(Si + Al) ration of 0.048), no obvious difference between kaolin and coal fly ash was observed in this work. Comparison of results for different K-species showed that coal fly ash captured KOH and K2CO3 more effectively than KCl and K2SO4. Additionally, a coal fly ash with higher content of Si and a lower melting point captured KCl more effectively than the reference coal fly ash.

KW - Additive

KW - Biomass combustion

KW - Coal fly ash

KW - K2CO3

KW - KCl

KW - Potassium capture

U2 - 10.1016/j.fuproc.2019.05.038

DO - 10.1016/j.fuproc.2019.05.038

M3 - Journal article

VL - 194

JO - Fuel Processing Technology

JF - Fuel Processing Technology

SN - 0378-3820

M1 - 106115

ER -