Bio-CLC Pilot Scale Experiments Combined with CFD Simulations: How To Improve the Performance by Better Design?

Juho Peltola (Corresponding author), Toni Pikkarainen, Timo Niemi

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

Abstract

Mitigation of climate change by stabilizing the global mean temperature
rise well below 2°C from the pre-industrial temperature level requires implementation of negative emission technologies (NETs). One of the most promising NETs is chemical looping combustion of biomass (bio-CLC). Biomass has the capability of withdrawing and storing atmospheric CO2 during growing. CO2 released from biomass during combustion can be captured and stored permanently underground, thus resulting net-negative CO2 emissions to the atmosphere. Recently bio-CLC has been tested in pilot and laboratory scale. Results with different solid biomass types and oxygen carriers has been published. The most important and common operational challenge has been deficient mixing and contact between oxygen transported by oxygen carriers
and volatiles released from biomass. This leads to insufficient combustion of gaseous species and high oxygen consumption in subsequent oxygen polishing unit. Also high concentrations of tars has been observed increasing the risk of operational problems. In this paper, pilot scale experimental results of bio-CLC with results of computational fluid dynamics (CFD) simulations of mixing are presented. Experimental tests were carried out with wood based pellets and wood char using ilmenite (iron based) and braunite (manganese based) as oxygen carriers. CFD simulations were used to study volatile gas by-pass differences observed in the experiment. The fluidized oxygen carrier bed was simulated using two-phase Euler-Euler approach. Fuel particles were
included in the simulation as Lagrangian particles with models for evaporation,
pyrolysis and gasification. CFD simulations were carried out with different fuels and particle size distributions. Simulation results are used to study the distribution of volatile release from different fuel particles and contact between the oxygen carriers and volatiles. Based on the results, an alternative reactor configuration that could decrease volatile gas bypass is simulated to illustrate how CFD simulations can be beneficial in design of pilot and large scale CLC systems, especially in fuel reactor and fuel feeding design.
Original languageEnglish
Title of host publication5th International Conference on Chemical Looping
Number of pages19
Publication statusPublished - 2018
MoE publication typeD3 Professional conference proceedings
Event5th International Conference on Chemical Looping - Utah, United States
Duration: 24 Sep 201827 Sep 2018

Conference

Conference5th International Conference on Chemical Looping
CountryUnited States
CityUtah
Period24/09/1827/09/18

Fingerprint

Oxygen
Computer simulation
Biomass
Experiments
Wood
Ore pellets
Ilmenite
Tar
Polishing
Gases
Gasification
Climate change
Fluidized beds
Manganese
Large scale systems
Evaporation
Pyrolysis
Iron
Temperature

Cite this

@inproceedings{56316b30917e4872b927f20dcf5e5fb3,
title = "Bio-CLC Pilot Scale Experiments Combined with CFD Simulations: How To Improve the Performance by Better Design?",
abstract = "Mitigation of climate change by stabilizing the global mean temperaturerise well below 2°C from the pre-industrial temperature level requires implementation of negative emission technologies (NETs). One of the most promising NETs is chemical looping combustion of biomass (bio-CLC). Biomass has the capability of withdrawing and storing atmospheric CO2 during growing. CO2 released from biomass during combustion can be captured and stored permanently underground, thus resulting net-negative CO2 emissions to the atmosphere. Recently bio-CLC has been tested in pilot and laboratory scale. Results with different solid biomass types and oxygen carriers has been published. The most important and common operational challenge has been deficient mixing and contact between oxygen transported by oxygen carriersand volatiles released from biomass. This leads to insufficient combustion of gaseous species and high oxygen consumption in subsequent oxygen polishing unit. Also high concentrations of tars has been observed increasing the risk of operational problems. In this paper, pilot scale experimental results of bio-CLC with results of computational fluid dynamics (CFD) simulations of mixing are presented. Experimental tests were carried out with wood based pellets and wood char using ilmenite (iron based) and braunite (manganese based) as oxygen carriers. CFD simulations were used to study volatile gas by-pass differences observed in the experiment. The fluidized oxygen carrier bed was simulated using two-phase Euler-Euler approach. Fuel particles wereincluded in the simulation as Lagrangian particles with models for evaporation,pyrolysis and gasification. CFD simulations were carried out with different fuels and particle size distributions. Simulation results are used to study the distribution of volatile release from different fuel particles and contact between the oxygen carriers and volatiles. Based on the results, an alternative reactor configuration that could decrease volatile gas bypass is simulated to illustrate how CFD simulations can be beneficial in design of pilot and large scale CLC systems, especially in fuel reactor and fuel feeding design.",
author = "Juho Peltola and Toni Pikkarainen and Timo Niemi",
year = "2018",
language = "English",
booktitle = "5th International Conference on Chemical Looping",

}

Peltola, J, Pikkarainen, T & Niemi, T 2018, Bio-CLC Pilot Scale Experiments Combined with CFD Simulations: How To Improve the Performance by Better Design? in 5th International Conference on Chemical Looping. 5th International Conference on Chemical Looping, Utah, United States, 24/09/18.

Bio-CLC Pilot Scale Experiments Combined with CFD Simulations : How To Improve the Performance by Better Design? / Peltola, Juho (Corresponding author); Pikkarainen, Toni; Niemi, Timo.

5th International Conference on Chemical Looping. 2018.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

TY - GEN

T1 - Bio-CLC Pilot Scale Experiments Combined with CFD Simulations

T2 - How To Improve the Performance by Better Design?

AU - Peltola, Juho

AU - Pikkarainen, Toni

AU - Niemi, Timo

PY - 2018

Y1 - 2018

N2 - Mitigation of climate change by stabilizing the global mean temperaturerise well below 2°C from the pre-industrial temperature level requires implementation of negative emission technologies (NETs). One of the most promising NETs is chemical looping combustion of biomass (bio-CLC). Biomass has the capability of withdrawing and storing atmospheric CO2 during growing. CO2 released from biomass during combustion can be captured and stored permanently underground, thus resulting net-negative CO2 emissions to the atmosphere. Recently bio-CLC has been tested in pilot and laboratory scale. Results with different solid biomass types and oxygen carriers has been published. The most important and common operational challenge has been deficient mixing and contact between oxygen transported by oxygen carriersand volatiles released from biomass. This leads to insufficient combustion of gaseous species and high oxygen consumption in subsequent oxygen polishing unit. Also high concentrations of tars has been observed increasing the risk of operational problems. In this paper, pilot scale experimental results of bio-CLC with results of computational fluid dynamics (CFD) simulations of mixing are presented. Experimental tests were carried out with wood based pellets and wood char using ilmenite (iron based) and braunite (manganese based) as oxygen carriers. CFD simulations were used to study volatile gas by-pass differences observed in the experiment. The fluidized oxygen carrier bed was simulated using two-phase Euler-Euler approach. Fuel particles wereincluded in the simulation as Lagrangian particles with models for evaporation,pyrolysis and gasification. CFD simulations were carried out with different fuels and particle size distributions. Simulation results are used to study the distribution of volatile release from different fuel particles and contact between the oxygen carriers and volatiles. Based on the results, an alternative reactor configuration that could decrease volatile gas bypass is simulated to illustrate how CFD simulations can be beneficial in design of pilot and large scale CLC systems, especially in fuel reactor and fuel feeding design.

AB - Mitigation of climate change by stabilizing the global mean temperaturerise well below 2°C from the pre-industrial temperature level requires implementation of negative emission technologies (NETs). One of the most promising NETs is chemical looping combustion of biomass (bio-CLC). Biomass has the capability of withdrawing and storing atmospheric CO2 during growing. CO2 released from biomass during combustion can be captured and stored permanently underground, thus resulting net-negative CO2 emissions to the atmosphere. Recently bio-CLC has been tested in pilot and laboratory scale. Results with different solid biomass types and oxygen carriers has been published. The most important and common operational challenge has been deficient mixing and contact between oxygen transported by oxygen carriersand volatiles released from biomass. This leads to insufficient combustion of gaseous species and high oxygen consumption in subsequent oxygen polishing unit. Also high concentrations of tars has been observed increasing the risk of operational problems. In this paper, pilot scale experimental results of bio-CLC with results of computational fluid dynamics (CFD) simulations of mixing are presented. Experimental tests were carried out with wood based pellets and wood char using ilmenite (iron based) and braunite (manganese based) as oxygen carriers. CFD simulations were used to study volatile gas by-pass differences observed in the experiment. The fluidized oxygen carrier bed was simulated using two-phase Euler-Euler approach. Fuel particles wereincluded in the simulation as Lagrangian particles with models for evaporation,pyrolysis and gasification. CFD simulations were carried out with different fuels and particle size distributions. Simulation results are used to study the distribution of volatile release from different fuel particles and contact between the oxygen carriers and volatiles. Based on the results, an alternative reactor configuration that could decrease volatile gas bypass is simulated to illustrate how CFD simulations can be beneficial in design of pilot and large scale CLC systems, especially in fuel reactor and fuel feeding design.

M3 - Conference article in proceedings

BT - 5th International Conference on Chemical Looping

ER -