CAJ | 학술논문

研制了一台能够连续制备蓄冷用CO2水合物的压缩式循环实验装置，并在该装置上研究了充注压力对水合物的预冷时间、生成质量、水合比例和潜热蓄冷量的影响。实验结果表明水合物在CO2气泡上升过程中生成，在气液界面处堆积。高的充注压力有着更理想的蓄冷特性，当充注压力为4.2 MPa时，预冷时间为8 min、水合物生成质量为8.44 kg、水合比例为75.1%、水合物潜热蓄冷量为4.22 MJ。充注压力为3.8 MPa及以上时，水合物生成量大，水合物阻碍釜内各部分的传热，使釜内中层、下层的温差较大。水合物生成过程后期，水合放热量减少，液体CO2在反应釜内的蒸发吸热效应使得釜内温度继续降低，一直到低于0℃，充注压力越高，此现象越明显。
연제료일태능구련속제비축랭용CO2수합물적압축식순배실험장치，병재해장치상연구료충주압력대수합물적예랭시간、생성질량、수합비례화잠열축랭량적영향。실험결과표명수합물재CO2기포상승과정중생성，재기액계면처퇴적。고적충주압력유착경이상적축랭특성，당충주압력위4.2 MPa시，예랭시간위8 min、수합물생성질량위8.44 kg、수합비례위75.1%、수합물잠열축랭량위4.22 MJ。충주압력위3.8 MPa급이상시，수합물생성량대，수합물조애부내각부분적전열，사부내중층、하층적온차교대。수합물생성과정후기，수합방열량감소，액체CO2재반응부내적증발흡열효응사득부내온도계속강저，일직도저우0℃，충주압력월고，차현상월명현。
A novel pilot-scale apparatus was designed to continuously produce CO2 hydrate for cool storage. The pre-chilling time, amount of CO2 hydrate formation, hydration ratio, and cool energy of hydrate were analyzed under different CO2 charge pressures. Results showed that CO2 hydrate formed during the rising process of CO2 bubbles in water and cumulated at the gas-liquid interface. The cool storage performance can be improved greatly as the charge pressure increases. Under charge pressure of 4.2 MPa, the pre-chilling time, amount of hydrate formation, hydration ratio and latent cool energy storage are 8 min, 8.44 kg, 75.1% and 4.22 MJ respectively. When the charge pressure is higher than 3.8 MPa, large temperature differences appear between the middle and low parts of reactor, resulted from low thermal conductivity of formed hydrate. Evaporation of liquid CO2 reduces reactor temperature to 0℃ or even lower at late stage of hydrate formation, which is more evident at higher charge pressures.