20 Oct 2022
 | 20 Oct 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Method for evaluating CO2 emission from a cement plant by atmosphere O2 / N2 and CO2 measurements and its applicability to the detection of CO2 capture signals

Shigeyuki Ishidoya, Kazuhiro Tsuboi, Hiroaki Kondo, Kentaro Ishijima, Nobuyuki Aoki, Hidekazu Matsueda, and Kazuyuki Saito

Abstract. Continuous observations of the atmospheric O2 / N2 ratio and CO2 amount fractions have been carried out at Ryori (RYO), Japan since August 2017. In these observations, the O2 : CO2 exchange ratio (oxidative ratio (OR), −Δy(O2y(CO2)−1) has frequently been lower than expected from short-term variations in emissions from terrestrial biospheric activities and combustion of liquid, gas, and solid fuels. This finding suggests a significant effect of CO2 emission from a cement plant located about 6 km northwest of RYO. To evaluate this effect quantitatively, we simulated CO2 amount fractions in the area around RYO by using a fine-scale atmospheric transport model that incorporated CO2 fluxes from terrestrial biospheric activities, fossil fuel combustion, and cement production. The simulated CO2 amount fractions were converted to O2 amount fractions by using the respective OR values for each of the incorporated CO2 fluxes, and then simulated OR values were calculated from the calculated O2 and CO2 amount fractions. To extract the contribution of CO2 emissions from the cement plant, we used y(CO2*) as an indicator variable, where y(CO2*) is a conservative variable for terrestrial biospheric activity and fossil fuel combustion obtained by simultaneous analyses of observed O2 / N2 ratios and CO2 amount fractions and simulated ORs. We confirmed that the observed and simulated OR values and also the y(CO2*) values and simulated CO2 amount fractions due only to cement production were generally consistent. These results suggest that combined measurements of O2 / N2 ratios and CO2 amount fractions will be useful for evaluating CO2 capture from flue gas at carbon capture and storage (CCS) plants, which, similar to a cement plant, change CO2 amount fractions without changing O2 values, although CCS plants differ from cement plants in the direction of CO2 exchange with the atmosphere.

Shigeyuki Ishidoya et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-570', Anonymous Referee #1, 09 Nov 2022
  • RC2: 'Comment on acp-2022-570', Anonymous Referee #2, 06 Dec 2022

Shigeyuki Ishidoya et al.

Shigeyuki Ishidoya et al.


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Short summary
A method evaluating techniques for carbon neutrality, such as carbon capture and storage (CCS), is important. This study presents a method to evaluate CO2 emission from a cement plant based on atmospheric O2 and CO2 measurements. The method will also be useful for evaluating CO2 capture from flue gas at CCS plants, since the plants remove CO2 from the atmosphere without causing any O2 changes, just as cement plants do, differing only in the direction of CO2 exchange with the atmosphere.