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本文采用直接接触式CO_2水合物蓄冷系统,在釜内初始水温26 oC以及充注压力(3.5~4.0)MPa条件下,研究不同充注压力下的蓄冷特性。实验结果表明:在充注压力为3.5 MPa时,两相CO_2在反应釜的初始入口干度为0.88;系统蓄冷速率为2.38 kW,釜内中下层温度突升明显;充注压力增至(3.6~4.0)MPa时,两相CO_2的初始入口干度依次降至0.78、0.64、0.51、0.40、0.35,蓄冷速率也依次增至3.28 kW、3.73 kW、4.82 kW、5.94 kW和6.40 kW,釜内中下层温度分离;系统的蓄冷过程不断消耗CO_2,两相CO_2的入口干度不断增大,系统蓄冷速率减小;系统充注压力越高,蓄冷特性越好。
In this paper, direct contact CO 2 hydrate storage system was used to study the storage characteristics under different filling pressures with the initial water temperature of 26 oC and the filling pressure of 3.5 ~ 4.0 MPa. The experimental results show that the initial inlet dryness of two-phase CO_2 in the reactor is 0.88 when the charging pressure is 3.5 MPa, the system cooling rate is 2.38 kW, and the temperature in the middle and bottom of the reactor rises sharply. The charging pressure increases to 3.6 ~ 4.0 MPa), the initial inlet dryness of two-phase CO_2 decreased to 0.78,0.64,0.51,0.40,0.35, and the storage rate increased to 3.28 kW, 3.73 kW, 4.82 kW, 5.94 kW and 6.40 kW, respectively Middle and lower temperature separation; the system of continuous cooling process consumes CO_2, two-phase CO_2 entrance dryness increases, the system cooling rate decreases; the higher the system charging pressure, the better the cold storage characteristics.