甲醇和乙二醇对甲烷水合物黏附强度的影响

doi:10.11949/0438-1157.20241483

摘要/Abstract

摘要：

甲烷水合物壁面黏附强度是评价管道水合物沉积堵塞趋势的关键参数。自行设计了一套高压可视化水合物黏附强度测试装置，测试甲烷水合物壁面黏附强度，并以此为参照体系分析甲醇和乙二醇对其的影响。结果表明：甲烷水合物壁面黏附强度由黏附层中水合物含量、壁面性质和水合物自身强度共同控制，高过冷度下粗糙壁面上的水合物黏附强度更大；添加甲醇和乙二醇显著降低甲烷水合物黏附强度，降低幅度可分别达到84%和87%，主要原因在于热力学抑制剂通过改变相平衡温度减缓了水合物生成速率，降低了壁面黏附层中水合物的含量，减小了水合物与管壁的黏附面积。

关键词: 甲烷水合物, 醇, 沉积, 黏附强度, 流动保障

Abstract:

The wall adhesion strength of methane hydrates serves as a key parameter for evaluating hydrate deposition and blockage risks in pipelines. To investigate this, a self-developed high-pressure visualizable hydrate adhesion strength testing apparatus was employed to measure methane hydrate adhesion strength. Using this system as a reference, the effects of methanol and ethylene glycol were analyzed. The results show that the wall adhesion strength of methane hydrate is controlled by the hydrate content in the adhesion layer, the wall properties and the hydrate's own strength. Under high supercooling, the hydrate adhesion strength on the rough wall is greater. The addition of methanol and ethylene glycol significantly reduced the adhesion strength of methane hydrates, with reductions of 84% and 87% at a concentration of 7%, respectively. The primary mechanism is that thermodynamic inhibitors alter the phase equilibrium temperature, slowing hydrate formation rates, which reduces the hydrate content in the adhesive layer and consequently decreases the effective contact area between hydrate and pipe wall.

Key words: methane hydrate, alcohol, deposition, adhesive strength, flow assurance

中图分类号:

TE 53

周臣儒, 刘陈伟, 王志远, 綦民辉, 董三宝, 王翔宇, 李明忠. 甲醇和乙二醇对甲烷水合物黏附强度的影响[J]. 化工学报, 2025, 76(7): 3596-3604.

Chenru ZHOU, Chenwei LIU, Zhiyuan WANG, Minhui QI, Sanbao DONG, Xiangyu WANG, Mingzhong LI. Effect of methanol and ethylene glycol on adhesion strength of methane hydrates[J]. CIESC Journal, 2025, 76(7): 3596-3604.

图/表 13

图1 高压水合物壁面黏附强度测试系统示意图

Fig.1 Schematic of experimental system of high-pressure hydrate wall adhesion strength

图2 反应釜内部构造

Fig.2 Internal structure of reaction kettle

图3 水合物沉积物黏附强度测试示意图

Fig.3 Schematic of adhesion strength test of hydrate sediment

图4 水合物黏附强度基线测试结果

Fig.4 Baseline test results of hydrate adhesion strength

图5 平板基底上水合物剥离模型示意图

Fig.5 Schematic of hydrate detachment model on substrate

图6 水合物黏附强度随生长时间的变化

Fig.6 Variation of hydrate adhesion strength with growth time

图7 水合物黏附强度随过冷度的变化

Fig.7 Variation of hydrate adhesion strength with subcooling

图8 测试壁面激光共聚焦扫描结果及对应接触角测试结果

Fig.8 Results of laser confocal scanning and corresponding contact angle of substrate

图9 水合物黏附强度随壁面粗糙度的变化

Fig.9 Variation of hydrate adhesion strength with roughness

图10 醇浓度对水合物黏附强度的影响

Fig.10 Effect of alcohol concentration on hydrate adhesion strength

图11 醇浓度对水合物相平衡温度的影响（压力为6.5 MPa）

Fig.11 Effect of alcohol concentration on hydrate phase equilibrium temperature (pressure is 6.5 MPa)

图12 甲醇（a）和乙二醇（b）浓度对水合物生长形态的影响

Fig.12 Effect of methanol (a) and ethylene glycol (b) concentrations on hydrate growth morphology

图13 水合物生成压力对水合物黏附强度的影响（醇质量分数为3%）

Fig.13 Effect of hydrate formation pressure on hydrate adhesion strength (alcohol concentration is 3%)

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