몇 가지 냉매를 사용한 이산화탄소 액화에 대한 비교 연구

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 34; no. 2; pp. 226 - 233
• Main Authors: 박일수(ILSU PARK), 황필성(PHILSUNG HWANG), 정기철(KICHEOL JUNG), 안준수(JUNESHU ANH), 조정호(JUNGHO CHO)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2023
• Subjects: 기계공학; Two-stage compression process(이단 압축 공정); Vapor recompression refrigeration cycle(증기 재압축 냉동 사이클); Liquefaction carbon dioxide(이산화탄소 액화); Refrigerants(냉매)
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/JHNE.2023.34.2.226

In this study, we compared the performance of several refrigeration cycles using different refrigerants and utilizing the cold heat of liquefied natural gas (LNG) for the liquefaction of carbon dioxide. The final conditions for the liquefied CO2 were set to -20℃ and 20 bar. The refrigerants used included R404a, ammonia, propane, and propylene using a vapor recompression refrigeration cycle. For the refrigeration cycle, the CO2 at room temperature and pressure was compressed in a two-stage compression process with an intermediate cooling stage using a refrigeration unit. To compare with the liquefaction process using refrigeration, we compressed the CO2 to 8 bar in a single compression stage and cooled it to around -50℃ using the cold heat of the LNG before liquefying it. Results showed that using ammonia as the refrigerant required the least amount of compressor power for the liquefaction process, and the heat transfer area of the evaporator was the smallest when using propylene as the refrigerant. Using the cold heat of LNG instead of refrigeration using R404a resulted in approximately 69% less energy consumption.