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P-T stability conditions of methane hydrate in sediment from South China Sea

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Journal of Natural Gas Chemistry 2011年第5期20卷 531-536页

作者： shicai sun Yuguang Ye Changling Liu Fengkui Xiang Yan Ma Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266510 Shandong China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao 266071 Shandong China Qingdao Institute of Marine Geology Qingdao 266071 Shandong China

For reasonable assessment and safe exploitation of marine gas hydrate resource, it is important to determine the stability conditions of gas hydrates in marine sediment. In this paper, the seafloor water sample and sediment sample （saturated with pore water） from Shenhu Area of South China Sea were used to synthesize methane hydrates, and the stability conditions of methane hydrates were investigated by multi-step heating dissociation method. Preliminary experimental results show that the dissociation temperature of methane hydrate both in seafloor water and marine sediment, under any given pressure, is depressed by approximately -1.4 K relative to the pure water system. This phenomenon indicates that hydrate stability in marine sediment is mainly affected by pore water ions.

关键词： sediment from South China Sea seafloor water methane hydrate stability condition

Pore capillary pressure and saturation of methane hydrate bearing sediments

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Acta Oceanologica Sinica 2014年第10期33卷 30-36页

作者： sun shicai LIU Changling YE Yuguang LIU Yufeng Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Qingdao Institute of Marine Geology

To better understand the relationship between the pore capillary pressure and hydrate saturation in sediments, a new method was proposed. First, the phase equilibria of methane hydrate in fine-grained silica sands were measured. As to the equilibrium data, the pore capillary pressure and saturation of methane hydrate were calculated. The results showed that the phase equilibria of methane hydrates in fine-grained silica sands changed due to the depressed activity of pore water caused by the surface group and negatively charged characteristic of silica particles as well as the capillary pressure in small pores together. The capillary pressure increased with the increase of methane hydrate saturation due to the decrease of the available pore space. However, the capillary-saturation relationship could not yet be described quantitatively because of the stochastic habit of hydrate growth.

关键词： methane hydrate equibrium silica sand saturation pore capillary pressure

Experimental studies on the P-T stability conditions and influencing factors of gas hydrate in different systems

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Science China Earth Sciences 2013年第3期56卷 594-600页

作者： LIU ChangLing YE YuGuang sun shicai CHEN Qiang MENG QingGuo HU GaoWei Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao Institute of Marine Geology College of Civil Engineering and Architecture Shandong University of Science and Technology

The P-T stability conditions of gas hydrate in different systems （i.e., solution, silica sand, and marine sediment） were studied using multi-step decomposition method with our experimental equipment. The effects of different ions with various concentra- tions and sediment grains on the P-T stability conditions of gas hydrate were investigated. The results show that different ions have different influences on the phase equilibrium of gas hydrate. However, the influence of ions is in a similar trend： the larg- er the concentration, the bigger the P-T curve shifts to the left. For the silica sand, the influence of pore capillarity of coarse particles （〉 460 ~tm） can be negligible. The P-T curve measured in coarse silica is in agreement with that in pure water. How- ever, the influence of pore capillarity of fine particles （〈 35 μm） is significant. The maximum reduction value of temperature is 1.5 K for methane hydrate under stable state. The sediment from the South China Sea significantly affects the P-T stability conditions of methane hydrate, with an average reduction value of 1.9 K within the experimental conditions. This is mainly the result of both the pore water salinity and the pore capillarity of sediment. Because the pore water salinity is keeping diluted by the fresh water released from hydrate dissociation, the measured P-T stability points fall on different P-T curves with the de- creasing salinity.

关键词： pore water silica sand methane hydrate sediment from South China Sea P-T stability conditions

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超声波作用下天然气水合物的形成

化学通报 2005年第11期68卷 867-870页

作者：孙始财樊栓狮中国科学院广州能源研究所天然气水合物中心中国科学院研究生院北京100039

实验搭建了一套高压条件下超声波作用于天然气水合物反应的装置系统,该系统中超声波的频率为20kHz,功率为0～150W可调.利用该装置研究了超声波对天然气水合物生成过程和引导时间的影响.实验发现声场中生成特征曲线诸如温度、压力、流量... 详细信息

实验搭建了一套高压条件下超声波作用于天然气水合物反应的装置系统,该系统中超声波的频率为20kHz,功率为0～150W可调.利用该装置研究了超声波对天然气水合物生成过程和引导时间的影响.实验发现声场中生成特征曲线诸如温度、压力、流量等随着时间的推迟与静态反应时不同,反应引导时间约缩短至静态时的1/6,分解后重新反应引导时间甚至缩短至静态的1/10.水合物成核速率提高是由于超声波提高了传质系数、成核点浓度和过饱和度,而降低了界面能.

关键词：天然气水合物超声波生成特征曲线引导时间

A proposed directional function and wind-wave directional spectrum

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Acta Oceanologica Sinica 1995年第2期14卷 155-166页

作者： Wen Shengchang Wu Kejian Guan Changlong sun shicai and Zhang Dacuo (Institute of Physical Oceanography, Ocean University of Oingdao, Oingdao 266003, China)

A directional function for frequencies equal to and larger than the peak frequency of a wind-wave frequency spectrum is constructed by fitting the angular spreading based on the analytically derived directional spectrum of Wen et al. (1993, Journal of Oceanography, 49(2), 131～147, 149～172). For frequencies smaller than the peak frequency, the directional function is obtained by comparing and analyzing existing formulas. The nondimensional wind-wave frequency spectrum of Wen et al. (1994, Progress in Natural Seience, 4(4). 407～427;4 (5), 586～596) has been used together with the directional function just mentioned to obtain the directional spectrum for easier application.

关键词： Wind-wave directional function directional spectrum

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外场作用下气体水合物形成分解试验研究

化工学报 2003年第Z1期54卷 86-90页

作者：孙始财樊栓狮中国科学院广州能源研究所天然气水合物中心广州510640

简述了磁场、微波、超声波的基本作用机理,介绍了国内外外场因素对气体水合物形成分解影响研究进展。最后指出开展相应研究的必要,并提出几点建议。

关键词：机理磁场微波超声波气体水合物

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一种新的水合物有效导热系数球形串并联模型

天然气工业 2022年第10期42卷 131-138页

作者：孙始财谷林霖杨震东李艳敏山东省土木工程防灾减灾重点实验室·山东科技大学土木工程与建筑学院

导热系数是天然气水合物(以下简称水合物)重要的热物理学性质参数之一,但实验室制备的水合物样品中不可避免地存在孔隙,难以测得纯水合物导热系数。为此,基于热阻原理提出了一种新的水合物有效导热系数球形串并联模型,并结合已有的实验... 详细信息

导热系数是天然气水合物(以下简称水合物)重要的热物理学性质参数之一,但实验室制备的水合物样品中不可避免地存在孔隙,难以测得纯水合物导热系数。为此,基于热阻原理提出了一种新的水合物有效导热系数球形串并联模型,并结合已有的实验数据获得了纯甲烷水合物导热系数的半经验方程。同时,利用该模型计算了水合物样品的有效导热系数与孔隙度,分析了制备方法对样品品质的影响。研究结果表明:(1)压力介于4.0~9.5 MPa和温度介于263.15~279.15 K时,纯甲烷水合物的导热系数为0.755 7~0.771 2 W/(m·K);(2)较之于孔隙度,孔隙流体性质对测量值影响更大;(3)样品压实可以有效减小孔隙度,但无法达到零孔隙;(4)溶解气法制备的样品中残留表面活性剂,影响样品纯度;(5)预先压实冰粉法制备的样品平均孔隙度为18.73%±0.23%,优于一般的压实方法,且在纯度上优于溶解气法。结论认为,新的水合物有效导热系数球形串并联模型不仅可以更准确地计算水合物样品导热系数,而且还可以分析样品品质,进而为水合物资源开发和衍生技术的应用提供了可靠的基础数据。

关键词：天然气水合物有效导热系数球形串并联模型冰粉法样品制备样品品质孔隙度孔隙流体

维普期刊数据库博看期刊

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纳米碳管强化水合物导热的研究

制冷学报 2006年第2期27卷 39-43页

作者：彭浩樊栓狮孙始财中国科学院广州能源研究所广州510640

实验研究了不同温度(258.15K^270.15K)、不同纳米碳管含量(0.1wt%~10wt%)以及有无分散剂十二烷基硫酸钠(Sodium Dodecyl Sulfate,SDS)情况下四氢呋喃(Tetrahydrofuran,THF)水合物的导热系数。结果表明:THF水合物的导热系数随纳米碳管含... 详细信息

实验研究了不同温度(258.15K^270.15K)、不同纳米碳管含量(0.1wt%~10wt%)以及有无分散剂十二烷基硫酸钠(Sodium Dodecyl Sulfate,SDS)情况下四氢呋喃(Tetrahydrofuran,THF)水合物的导热系数。结果表明:THF水合物的导热系数随纳米碳管含量的增加而显著增加,纳米碳管的加入并没有改变THF水合物导热系数随温度的玻璃体变化特性。在纳米碳管质量分数一定时,随着温度的升高,THF水合物导热系数增大的速率越来越快。对于含纳米碳管的THF水合物,不加分散剂时的导热系数比加分散剂的导热系数低,但高于纯THF水合物的导热系数。

关键词：热工学水合物导热系数纳米碳管

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科研创新驱动的研究型教学探索与实践

山东电力高等专科学校学报 2022年第3期25卷 47-50页

作者：孙始财山东科技大学山东青岛266590

以“热质交换原理与设备”课程为例,探索了科研创新驱动的研究型教学模式。阐述了研究型教学的设计思路,分析了科研与教学内容的融合点,构建了教学实施流程,并提出了相应的实施条件,教学效果表明研究型教学模式是培养具有创新意识和创... 详细信息

以“热质交换原理与设备”课程为例,探索了科研创新驱动的研究型教学模式。阐述了研究型教学的设计思路,分析了科研与教学内容的融合点,构建了教学实施流程,并提出了相应的实施条件,教学效果表明研究型教学模式是培养具有创新意识和创新能力人才的重要方法之一。

关键词：研究型教学教学模式项目驱动