Piloting of bio-CLC for BECCS

Research output: Contribution to conferenceConference articleScientificpeer-review

Abstract

A new 10-50 kWth scale dual fluidized bed (DFB) chemical looping combustion (CLC) process development unit (PDU) applicable for biomass was constructed during 2015-16, located in VTT's new piloting center Bioruukki in Finland. The DFB-CLC test rig consists of a circulating fluidized bed (CFB) air reactor interconnected with a bubbling fluidized bed (BFB) fuel reactor. A set of tests were carried out with ilmenite as oxygen carrier, using white and black wood pellets as fuels. The main targets were to study main operational and process parameters for CLC using biomass-based fuels with a high volatile content. Another interest was to assess the risk for high-temperature corrosion in the flue gas path of the air reactor to evaluate the possibility for improving power generation efficiency by using enhanced steam values. The DFB-PDU was operated with biofuel in total for 16 h for 9 tests. The main challenge encountered was an insufficient bed temperature of the fuel reactor (900-950ºC targeted, 840-860ºC achieved) causing a relatively high oxygen demand (29-41%). The main reason for this was that the DFB-PDU was originally designed for gasification. A clear dependency of the fluidization velocity on the CO2 capture efficiency and oxygen demand was found and explained. As the fuel is fed and gasified in the fuel reactor, fuel leakage to the air reactor was low and alkaline components were not accumulated to the surface of oxygen carrier particles, it can be concluded that concentrations of vaporized alkali chlorides components in air reactor flue gas are much lower than in conventional biomass combustion applications. The results indicate that the risk of high-temperature corrosion of superheater tubes is lower in bio-CLC than conventional biomass combustion, making it possible to to use higher steam values (temperature, pressure) in bio-CLC improving the power generation efficiency from biomass.
Original languageEnglish
Number of pages13
Publication statusPublished - 2016
Event4th International Conference on Chemical Looping - Nanjing, China
Duration: 26 Sep 201628 Sep 2016

Conference

Conference4th International Conference on Chemical Looping
CountryChina
CityNanjing
Period26/09/1628/09/16

Fingerprint

Biomass
Fluidized beds
Fluidized bed process
Air
Flue gases
Power generation
Steam
Superheater tubes
Corrosion
Ilmenite
Temperature
Oxygen
Fluidization
Leakage (fluid)
Biofuels
Gasification
Wood

Keywords

  • chemical looping
  • bio
  • biomass
  • oxygen carrier

Cite this

Pikkarainen, T., Hiltunen, I., & Teir, S. (2016). Piloting of bio-CLC for BECCS. Paper presented at 4th International Conference on Chemical Looping, Nanjing, China.
Pikkarainen, Toni ; Hiltunen, Ilkka ; Teir, Sebastian. / Piloting of bio-CLC for BECCS. Paper presented at 4th International Conference on Chemical Looping, Nanjing, China.13 p.
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keywords = "chemical looping, bio, biomass, oxygen carrier",
author = "Toni Pikkarainen and Ilkka Hiltunen and Sebastian Teir",
year = "2016",
language = "English",
note = "4th International Conference on Chemical Looping ; Conference date: 26-09-2016 Through 28-09-2016",

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Pikkarainen, T, Hiltunen, I & Teir, S 2016, 'Piloting of bio-CLC for BECCS' Paper presented at 4th International Conference on Chemical Looping, Nanjing, China, 26/09/16 - 28/09/16, .

Piloting of bio-CLC for BECCS. / Pikkarainen, Toni; Hiltunen, Ilkka; Teir, Sebastian.

2016. Paper presented at 4th International Conference on Chemical Looping, Nanjing, China.

Research output: Contribution to conferenceConference articleScientificpeer-review

TY - CONF

T1 - Piloting of bio-CLC for BECCS

AU - Pikkarainen, Toni

AU - Hiltunen, Ilkka

AU - Teir, Sebastian

PY - 2016

Y1 - 2016

N2 - A new 10-50 kWth scale dual fluidized bed (DFB) chemical looping combustion (CLC) process development unit (PDU) applicable for biomass was constructed during 2015-16, located in VTT's new piloting center Bioruukki in Finland. The DFB-CLC test rig consists of a circulating fluidized bed (CFB) air reactor interconnected with a bubbling fluidized bed (BFB) fuel reactor. A set of tests were carried out with ilmenite as oxygen carrier, using white and black wood pellets as fuels. The main targets were to study main operational and process parameters for CLC using biomass-based fuels with a high volatile content. Another interest was to assess the risk for high-temperature corrosion in the flue gas path of the air reactor to evaluate the possibility for improving power generation efficiency by using enhanced steam values. The DFB-PDU was operated with biofuel in total for 16 h for 9 tests. The main challenge encountered was an insufficient bed temperature of the fuel reactor (900-950ºC targeted, 840-860ºC achieved) causing a relatively high oxygen demand (29-41%). The main reason for this was that the DFB-PDU was originally designed for gasification. A clear dependency of the fluidization velocity on the CO2 capture efficiency and oxygen demand was found and explained. As the fuel is fed and gasified in the fuel reactor, fuel leakage to the air reactor was low and alkaline components were not accumulated to the surface of oxygen carrier particles, it can be concluded that concentrations of vaporized alkali chlorides components in air reactor flue gas are much lower than in conventional biomass combustion applications. The results indicate that the risk of high-temperature corrosion of superheater tubes is lower in bio-CLC than conventional biomass combustion, making it possible to to use higher steam values (temperature, pressure) in bio-CLC improving the power generation efficiency from biomass.

AB - A new 10-50 kWth scale dual fluidized bed (DFB) chemical looping combustion (CLC) process development unit (PDU) applicable for biomass was constructed during 2015-16, located in VTT's new piloting center Bioruukki in Finland. The DFB-CLC test rig consists of a circulating fluidized bed (CFB) air reactor interconnected with a bubbling fluidized bed (BFB) fuel reactor. A set of tests were carried out with ilmenite as oxygen carrier, using white and black wood pellets as fuels. The main targets were to study main operational and process parameters for CLC using biomass-based fuels with a high volatile content. Another interest was to assess the risk for high-temperature corrosion in the flue gas path of the air reactor to evaluate the possibility for improving power generation efficiency by using enhanced steam values. The DFB-PDU was operated with biofuel in total for 16 h for 9 tests. The main challenge encountered was an insufficient bed temperature of the fuel reactor (900-950ºC targeted, 840-860ºC achieved) causing a relatively high oxygen demand (29-41%). The main reason for this was that the DFB-PDU was originally designed for gasification. A clear dependency of the fluidization velocity on the CO2 capture efficiency and oxygen demand was found and explained. As the fuel is fed and gasified in the fuel reactor, fuel leakage to the air reactor was low and alkaline components were not accumulated to the surface of oxygen carrier particles, it can be concluded that concentrations of vaporized alkali chlorides components in air reactor flue gas are much lower than in conventional biomass combustion applications. The results indicate that the risk of high-temperature corrosion of superheater tubes is lower in bio-CLC than conventional biomass combustion, making it possible to to use higher steam values (temperature, pressure) in bio-CLC improving the power generation efficiency from biomass.

KW - chemical looping

KW - bio

KW - biomass

KW - oxygen carrier

M3 - Conference article

ER -

Pikkarainen T, Hiltunen I, Teir S. Piloting of bio-CLC for BECCS. 2016. Paper presented at 4th International Conference on Chemical Looping, Nanjing, China.