A novel application of the SAWD-Sabatier-SPE integrated system for CO2 removal and O2 regeneration in submarine cabins during prolonged voyages

摘要

To improve the working and living environment of submarine crews, an integrated system of 2 removal%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>CO2 removal and 2 regeneration%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>o2 regeneration was designed to work under experimental conditions for 50 people in a submarine cabin during prolonged voyages. The integrated system comprises a solid amine water desorption (SAWD) unit for CO2 collection and concentration, a sabatier reactor for CO2 reduction and a solid polymer electrolyte (SPE) unit for 2 regeneration%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>o2 regeneration by electrolysis. The performances of the SAWD-Sabatier-SPE integrated system were investigated. The experimental results from the SAWD unit showed that the average CO2 concentration in the CO2 storage tank was more than 96% and the outlet CO2 concentration was nearly zero in the first 45 min, and less than 1/10 of inlet CO2 after 60 min when input CO2 was 0.5% (1000 L). About 950 L of CO2 was recovered with a recovery rate of 92%~97%. The output CO2 concentration was less than 0.2%, which showed that the adsorption-desorption performance of this unit was excellent. In the CO2 reduction unit we investigated mainly the start-up and reaction performance of the sabatier reactor. The start-up time of the sabatier reactor was 6, 8 and 10 min when the start-up temperature was 187.3, 179.5 and 168 °C, respectively. The product water was colorless, transparent, and had a pH of 6.9~7.5, and an electrical conductivity of 80 μs/cm. The sum of the concentration of metal ions (Ru3+, Al3+, Pb2+) was 0.028% and that of nonmetal ions (Cl?, SO42?) was 0.05%. In the 2 regeneration%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>o2 regeneration unit, the O2 generation rate was 0.48 m3/d and the quantity was 2400 L, sufficient to meet the submariners’ basic oxygen demands. These results may be useful as a basis for establishing CO2-level limits and 2 regeneration%29&ck%5B%5D=abstract&ck%5B%5D=keyword'>o2 regeneration systems in submarines or similar enclosed compartments during prolonged voyages.