天然气水合物稳定性试验

作为中国未来重要的替代能源，天然气水合物受到科学界的密切关注，研究不同温度、压力等条件下天然气水合物的稳定性，从而确定其合适的储存、运输条件具有重要意义。为此，用300 mg/L的十二烷基硫酸钠溶液生成天然气水合物，试验研究天然气水合物在不同温度（-5~-25 ℃）下的常压分解；设计制造了带压实功能的水合物反应釜，试验研究用10 MPa压力对水合物进行压实后在不同温度（-10 ℃、-15 ℃和-20 ℃）下的常压分解。研究发现：压实提高了水合物的自保性，使水合物的分解速率降低；天然气水合物在大气压力下，无论压实和不压实，在-20 ℃时分解速率最低，不压实时日分解率为2.69%，完全分解需要约23 d；压实后日分解率为2.23%，完全分解需要约26 d；一定的压力下水合物的分解速度减小。

EXPERIMENTAL STUDY ON NATURAL GAS HYDRATE STABILITY

Natrual gas hydrate as an important alternative energy is attracted more attentions in the scientific field, so it is of importance to study the stability of natural gas hydrate under different temperatures and pressures to confirm its transporting condition and storing condition. As a result, atmospheric decomposition of natural gas hydrate under different temperatures (from -5 ℃ to -25 ℃) is studied through forming natural gas hydrate by using the solution of 300 mg/L sodium codicil sulfate and hydrate reactor with the compaction function is designed and made in which atmospheric decomposition under different temperatures （-10 ℃, -15 ℃ and -20 ℃） is studied after compacted at 10 MPa. It is shown that compaction improves self preservation of hydrate and decreases its decomposition rate; no matter compacted or not, the decomposition rate of natural gas hydrate under atmospheric pressure is the lowest at -20 ℃; the daily decomposition rate under the condition of non compaction is 2.69 % and it will take 23 days for complete decomposition while the daily decomposition rate under the condition of compaction is 2.23%, and it will take 26 days for complete decomposition. Under a certain pressure, the decomposition rate decreases.