基于水合物技术的沼气配送工艺研究

Storage and transportation of biogas based on hydrate technology

以十二烷基硫酸钠（SDS）作为促进剂,开展水合物技术配送沼气的工艺研究,考察了沼气水合物的制备、存储稳定性及分解释放等。结果表明,以浓度为0.03%（v/v）的SDS溶液为工作液,沼气水合物具有接近理论值的储气效果,单位储气量可达170 V/V,制备水合物的最优条件为温度1～3℃,压力3.0～3.5 MPa。沼气水合物在略低于0℃的条件下显示出良好的稳定性。温度越低,压力越高,越有利于沼气水合物的存储,但储运成本增加;在短距离配送中,温度略低于0℃的封闭体系即可满足储运要求。常压敞开条件下,沼气水合物可迅速分解释放,25℃时的释放时间为12 min。沼气水合物分解后的工作液可以回用,且对水合物的制备有促进作用。

Adding sodium dodecyl sulfate（SDS） as a promoter, the hydrate technology for storage and transportation of biogas was studied. The preparation, storage stability, decomposition andrelease of biogas hydrates were investigated. Using 0.03% SDS solution as working fluid, the biogas hydratepresentedgreat storage capacity, up to 170 V/V, which was closed to the theoretical value. The optimal conditions for preparation were temperature 1～3 ℃ and pressure 3.0～3.5 MPa. Biogas hydrates showed good stability when the temperature was slightly below 0 ℃. Lower temperature and higher pressure conduciveto the storage of biogas hydrates, but the costs would increase. In short distance distribution, a closed system with the temperature just below 0 ℃ can meet the requirements. In atmospheric conditions, the biogas hydrate released rapidly. For example, the release time was only 12 min at 25 ℃. The working liquid can be recycled, and had a certain degree of role in promoting the preparation of biogas hydrates.