海底渗漏系统水合物生成过程实验模拟

EXPERIMENTAL SIMULATION OF OCEANIC LEAKAGE HYDRATE FORMATION

根据天然气水合物渗漏系统的形成特征，设计了一套模拟实验系统，即在低温环境中，采用体积为4．62L的透明反应釜，在釜底放置50mm厚的河砂，将二氧化碳气体从釜底部的射流器口喷射进入砂层，在一定的低温（0．5～3℃）和压力范围（1～4MPa）下进行了水合物快速生成模拟实验。实验结果表明，该系统可以模拟海底渗漏体系水合物形成过程，水合物形成特点和形态与海底拍摄的情景相似；2℃和3MPa条件下，得到二氧化碳水合物生成过程中二氧化碳消耗速度瞬时最大值为2．03mol／（s·m^2）。

According to the formation characteristics of the natural gas hydrate leakage system, a model experimental system was set up. The main part of the system was a 4. 62 L transparent organic glass cell. Before the experiments, river sands with a thickness of 50ram were set at the bottom of the cell. An ejector was used to introduce carbon dioxide into submerged sand-layer. The experiment was carried out at the temperature range of 273.5～276.0 K, pressure range of 1.0～4.0 MPa. The experiment shows that, under 2℃ and 3 MPa condition, when the carbon dioxide leakage flux is 0.92 mol/（s·m^2）, the carbon dioxide＇s depletion rate can reach at 2[ 03 mol/（s ·m^2）.