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Evaluation of CLC as a BECCS technology from tests on woody biomass in an auto-thermal 150-kW pilot unit
Highlights Several CLC tests using woody biomass, petcoke and mixtures of the two have been conducted in a pilot unit with fuel feeding rates equivalent to 79 – 129 kW. Ilmenite has been used as oxygen carrier material. The operation is auto thermal with the preheating of the air to the air reactor as the only external heat source. CO2 capture efficiency up to 97 % and fuel reactor gas conversion efficiency up to 83 % was achieved for the woody biomass fuels. For the petcoke fuels, the CO2 capture efficiency was limited to about 40 % due to its low volatile content and low char reactivity. The CLC unit does not have a carbon stripper, and one of the goals of the study is to conclude whether a carbon stripper can be eliminated when using reactive fuels, such as woody biomass. The overall conclusion from the tests is that CO2 capture efficiencies could be above 95 % in a larger industrial CLC unit operating on biomass, even without a carbon stripper, but that a carbon stripper is needed to reduce the transition of carbon from the fuel reactor to the air reactor for fuels containing less volatiles and with less reactive chars.
Abstract In this work, woody biomass is converted by chemical looping combustion (CLC) in the auto-thermally operated 150-kW pilot unit at SINTEF Energy Research in Norway, using ilmenite as an oxygen carrier. The pilot unit consists of two inter-connected circulating fluidized bed reactors, being the air and fuel reactor, respectively. The unit is simplified compared to many other lab and pilot units by not having a carbon stripper. The aim of the present study is to evaluate the main performance parameters when operating a relatively large CLC unit in auto-thermal mode, using a cheap natural mineral, ilmenite, as oxygen carrier. Another aspect with the tests is to verify if the omission of a carbon stripper can provide high enough capture efficiencies for solid fuels as biomass, with a large share of volatiles and a char remnant with high reactivity. As a comparison, tests with petcoke were performed, to assess the effect when using a fuel with a low share of volatiles and slow char conversion. The results imply that CO2 capture efficiencies can be well above 95 % in a larger industrial unit operating on biomass, even without a carbon stripper, but that a carbon stripper is definitely needed for fuels with less volatiles and low char reactivity.
Evaluation of CLC as a BECCS technology from tests on woody biomass in an auto-thermal 150-kW pilot unit
Highlights Several CLC tests using woody biomass, petcoke and mixtures of the two have been conducted in a pilot unit with fuel feeding rates equivalent to 79 – 129 kW. Ilmenite has been used as oxygen carrier material. The operation is auto thermal with the preheating of the air to the air reactor as the only external heat source. CO2 capture efficiency up to 97 % and fuel reactor gas conversion efficiency up to 83 % was achieved for the woody biomass fuels. For the petcoke fuels, the CO2 capture efficiency was limited to about 40 % due to its low volatile content and low char reactivity. The CLC unit does not have a carbon stripper, and one of the goals of the study is to conclude whether a carbon stripper can be eliminated when using reactive fuels, such as woody biomass. The overall conclusion from the tests is that CO2 capture efficiencies could be above 95 % in a larger industrial CLC unit operating on biomass, even without a carbon stripper, but that a carbon stripper is needed to reduce the transition of carbon from the fuel reactor to the air reactor for fuels containing less volatiles and with less reactive chars.
Abstract In this work, woody biomass is converted by chemical looping combustion (CLC) in the auto-thermally operated 150-kW pilot unit at SINTEF Energy Research in Norway, using ilmenite as an oxygen carrier. The pilot unit consists of two inter-connected circulating fluidized bed reactors, being the air and fuel reactor, respectively. The unit is simplified compared to many other lab and pilot units by not having a carbon stripper. The aim of the present study is to evaluate the main performance parameters when operating a relatively large CLC unit in auto-thermal mode, using a cheap natural mineral, ilmenite, as oxygen carrier. Another aspect with the tests is to verify if the omission of a carbon stripper can provide high enough capture efficiencies for solid fuels as biomass, with a large share of volatiles and a char remnant with high reactivity. As a comparison, tests with petcoke were performed, to assess the effect when using a fuel with a low share of volatiles and slow char conversion. The results imply that CO2 capture efficiencies can be well above 95 % in a larger industrial unit operating on biomass, even without a carbon stripper, but that a carbon stripper is definitely needed for fuels with less volatiles and low char reactivity.
Evaluation of CLC as a BECCS technology from tests on woody biomass in an auto-thermal 150-kW pilot unit
LANGØRGEN, Øyvind (author) / SAANUM, Inge (author) / KHALIL, Roger (author) / HAUGEN, Nils Erland L. (author)
2023-10-24
Article (Journal)
Electronic Resource
English