Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| CO2乳状液置换开采天然气水合物实验模拟研究 | |
| Alternative Title | Experimental Study of Methane Replacement from Its Hydrate with Carbon Dioxide-in-Water Emulsion |
| 周锡堂 | |
| Thesis Advisor | 樊栓狮 |
| 2008-01-10 | |
| Degree Grantor | 中国科学院广州能源研究所 |
| Place of Conferral | 广州能源研究所 |
| Degree Name | 博士 |
| Keyword | 置换 甲烷 甲烷水合物 水包二氧化碳型乳状液 |
| Abstract | 天然气水合物是一种储量巨大的清洁能源，而二氧化碳（CO2）是需要限制排放的温室气体。利用CO2置换开采天然气水合物是一种集能源产出与温室气体处置于一体的新型开采方案。将CO2制备成乳状液的目的在于利用二氧化碳乳状液的某些特性达到强化置换反应、以推动置换开采走向商业化。 研究了乳化剂用量、CO2与水的质量比、乳化压力、乳化器搅拌速度等对乳化过程和结果的影响。实验中所使用的乳化器容积为350ml；乳化剂为一种非离子表面活性剂-TMN-6。研究表明，在25℃以下、30MPa左右，经过快速剪切可以制备出稳定的水包CO2型乳状液。 研究了一系列水包CO2乳状液对石英砂中CH4水合物的置换动力学，测定了用这些乳状液置换天然气水合物中CH4的置换率随置换时间的变化。在容积257ml的模拟反应器中，被置换的天然气水合物是用甲烷于润湿的石英砂中经制冷形成的，在SDS作用下，24h内可以完成甲烷水合物的形成，水合常数约为6.5。根据水合物相图分析了置换反应的温度压力范围。研究发现，在281.2 0.2K、5MPa下，以CO2乳状液注入含CH4水合物的石英砂中，CH4的置换率为使用纯液态CO2时置换率的1.5倍左右。同时还研究了CO2乳状液在其他温度压力范围的置换、以及液态和气态CO2在相关条件下的置换效果，发现合理的置换应该是：以高浓度CO2乳状液，在CO2水合物能稳定、而CH4水合物不能稳定存在的温度压力范围内置换。 |
| Other Abstract | Natural gas hydrates is a clean energy sources with tremendous reserves, and CO2 is a greenhouse gas to be restricted. That to replace CH4 from its hydrate with CO2 is a new method that combibes energy exploitation with greenhouse gas sequestration. The intention to use CO2 emulsion is to enhance the replacement by use of the properties of the emulsion, and to promote its practical application. The relations between the emulsification process and results and the operation parameters such as content of TMN-6, mass ratio of CO2 and water, pressure and stirring rate were investigated. A nonionic surfactant Tergitol TMN-6 was used as emulgator and emulsion preparation was performed in an emulsifier of 350ml. It is indicated by experiment that at 30MPa and below 298K, a CO2-in-water emulsion can be formed and can exist for about 10 h stably. The kinetic property of replacement of CH4 from its hydrate with a series of CO2 emulsions were investigated.The CH4 hydrate used to be replaced was formed by refrigeration in the wetted quartz sand that in a cell with a capacity of 257ml. Under the promotion of SDS CH4 hydrate can be formed within 24h with the hydration number of about 6.5. Based on the analysis of phase graphs the reasonable scopes of hydration pressure and temperature were determined. It was shown by experiments that at 281.2 0.2 K and 5MPa, CH4 were replaced from its hydrate with the above emulsion and the replacement ratio was about 1.5 times of that replaced with pure liquid CO2 , which indicated that the result was more excellent to replace with CO2 emulsion than with liquid CO2. At the same time, it was investigated that to replace CH4 in its hydrate with CO2 at other pressure and temperature and with liquid and gaseous CO2. It was reasonable to replace CH4 from its hydrate with high-internal CO2 emulsion under some condition, in which CO2 hydrate can but CH4 hydrate can not exist stably. |
| Pages | 119 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/4055 |
| Collection | 中国科学院广州能源研究所 |
| Recommended Citation GB/T 7714 | 周锡堂. CO2乳状液置换开采天然气水合物实验模拟研究[D]. 广州能源研究所. 中国科学院广州能源研究所,2008. |
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