水冷压缩式CO2水合物蓄冷系统的蓄冷特性实验研究

本文实验研究了初始充注压力为3.5~4.0 MPa时水冷压缩式CO2水合物蓄冷系统的蓄冷特性，通过实验数据计算蓄冷量和蓄冷速率。结果表明：高充注压力具有更好的蓄冷特性，原因在于充注压力越高，反应釜入口干度越小，单位质量CO2携带的冷量越大。在初始充注压力为4.0 MPa时，蓄冷特性最好：蓄冷时间最短（11.33 min），平均蓄冷速率最高（5.19 kW），水合物生成质量最多（3.96 kg），水合物蓄冷量占总蓄冷量比例最高（57%）；在初始充注压力为3.5 MPa时，蓄冷特性最差：蓄冷时间最长（37.50 min），平均蓄冷速率最低（1.07kW），水合物生成质量最少（1.58 kg），水合物蓄冷量占总蓄冷量比例最低（34%）。与风冷压缩式蓄冷系统相比，水冷压缩式蓄冷系统水合物生成质量增长率最高为38.6%，总蓄冷量增长率最高为13.24%。

Experimental Study on Cold Storage Characteristics of Water-cooled Compressed CO2 Hydrate Cold Storage System

A water-cooled compressive CO2 hydrate cold storage system was designed to examine the hydrate cold storage characteristics with different initial charge pressure values (from 3.5 MPa to 4.0 MPa). Furthermore, cold storage capacity and cold storage velocity are calculated based on the experimental data. The results indicated that as the initial charge pressure increases, the cold storage characteristics are improved. This is because as the initial charge pressure increases, the dryness degree of CO2 at the reactor inlet decreases and the cold capacity of the unit mass CO2 increases. When the initial charge pressure was 4.0 MPa, the cold storage characteristics were optimal: the cold storage time was the shortest (11.33 min), the average cold storage velocity was the highest (5.19 kW), the hydrate generating mass was of the maximum value (3.96 kg), and the ratio of hydrate cold storage capacity to total cold storage capacity was the highest (57%). When the initial charge pressure was 3.5 MPa, the cold storage characteristics were the worst: the cold storage time was the longest (37.50 min), the average cold storage velocity was the lowest (1.07 kW), the hydrate generating mass was of the minimum value (1.58 kg), and the ratio of hydrate cold storage capacity to total cold storage capacity was the lowest (34%). When compared with air-cooled compressive cold storage system, the cold storage characteristics of the water-cooled compressive cold storage system were significantly improved: the maximum increase in hydrate formation mass was 38.6%, and the maximum increase in total cold storage was 13.24%.