Effects of inhibitors on the morphology and kinetics of hydrate growth on surface of bubble
Effects of inhibitors on the morphology and kinetics of hydrate growth on surface of bubble
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DOI：
10.1016/j.jngse.2019.103096
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发表时间：
2020-02
影响因子：
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通讯作者：
Xin-Yang Zeng;Guozhong Wu;Jiang-Tao Wang;Caifeng Yang;Qingli Meng;Guangjin Chen;Daoyi Chen
中科院分区：
文献类型：
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作者：
Xin-Yang Zeng;Guozhong Wu;Jiang-Tao Wang;Caifeng Yang;Qingli Meng;Guangjin Chen;Daoyi Chen
研究结果为水合物在含抑制剂的水中气泡（CH 4-C3 H8）上增稠生长过程中的生长模式、形貌、横向生长速率和传质通道的演化提供了直接证据。在不加抑制剂的增稠生长过程中（生长模式1），在气泡表面和气液平面界面上观察到均匀致密的水合物膜，而加入低浓度动力学抑制剂时（生长模式2），水合物膜不均匀，加入高浓度热力学抑制剂时（生长模式3），水合物膜甚至不能形成。在生长模式2中，抑制剂在水合物膜前沿的吸附破坏了水合物生长的连续性，降低了气泡上水合物膜的横向生长速率。此外，这种不均匀性还导致膜上出现大量十字形或圆形的凹坑，为水合物的初始增稠生长提供了新的传质通道。在生长模式3中，水合物形态的演变与反应体系中形成的水合物的粘度和水溶液在反应器壁上的铺展能力相关。据我们所知，这是第一次研究抑制剂对气泡上水合物生长动力学的微观影响，这对于更好地理解在气泡作用下水合物抑制情景中水合物的演化过程具有附加价值。
This study provided direct evidences for the evolution of the growth modes, morphology, lateral growth rate and the mass transfer channels during the thickening growth of hydrates on gas (CH4– C3H8) bubble suspended in water with inhibitors. Uniform and dense hydrate film was observed on the bubble and at the gas-liquid planar interface during thickening growth in absence of inhibitor (Growth Mode 1), but the film was heterogeneous when low concentration kinetic inhibitor was added (Growth Mode 2) and even not able to form when high concentration thermodynamic inhibitor was added (Growth Mode 3). In the Growth Mode 2, the adsorption of inhibitor on the frontier of the hydrate film destroyed the continuity of the hydrate growth and decreased the lateral growth rate of the hydrate film on the bubble. Moreover, the heterogeneousness resulted in numerous cross-shaped or circular craters on the film, which served a new mass transfer channel and accelerated the initial thickening growth of the hydrate. In the Growth Mode 3, the evolution of the hydrate morphology was correlated to the viscosity of the hydrate formed in the reaction systems and the spreading ability of the aqueous solution on the reactor wall. To the best of our knowledge, this was the first study on the microscopic effects of inhibitors on the kinetics of the hydrate growth on gas bubbles, which is of added value for better understanding the hydrate evolution process in the hydrate inhibition scenarios with gas bubbles.