HCFC141b气体水合物快速生成实验研究

Experimental study on the fast formation of HCFC141b gas hydrate

制冷剂气体水合物快速均匀生成是气体水合物蓄冷技术实用化的关键．1-7℃内，实验中首次发现与试管壁面接触的铁丝对表面活性剂（十二烷基苯磺酸钠）水溶液与HCFC141b（CH3 CC12 F，R141b）液体静态生成气体水合物有巨大影响：铁丝与壁面的接触位置改变了R141b气体水合物的成核点和生成区域，明显缩短了气体水合物的引导时间，大大加快了水合反应，相同条件下，穿过两相界面（十二烷基苯磺酸钠水溶液和R14lb液体界面）与试管侧壁面接触的铁丝对R141b气体水合物生成的诱导作用最强；气体水合物不但可以在水和制冷荆液体两相界面上或水相中首先生成，而且也可以在制冷剂相中独立完成；水分子贴着玻璃壁面要比直接通过R141b液体容易扩散；水合率随恒温槽温度的变化表明环境温度仍然是决定水合反应快慢的基本因素之一．

The key to the application of gas hydrate cool storage technology is that the gas hydrate forms fast and evenly, which is one of the hotspots of gas hydrate research. In this paper, the influence of the iron rod on the static formation of gas hydrate HCFC 141 b （ CH3 CCI2 F, R141 b） has been studied in the system of water solutions with 0. 038wt% sodium dodecylbenzenesulfonate -6 and R141b and iron rod at the range of 1 -7℃ under the atmospheric pressure. The results show that the iron rod contacting with the wall has great influence on the formation of R141b gas hydrate. It shifts the nucleation site of R141b gas hydrate and the forming region subsequently and reduces the induction time and accelerates the process of R141b gas hydrate. Under the same conditions, the iron rod, which penetrates the interface of water solutions with 0. 038wt% sodium dodecylbenzenesulfonate -6 and R141b and touches the side wall of the tube, has the strongest influence on the formation of R141b gas hydrate. R141b gas hydrate can be not only formed firstly on the interface of the water solution and liquid R141b or in water solution phase, but also formed completely in the liquid R141b phase. Water penetrates faster along the tube wall than through liquid R141b. According to the growth rate of R141b gas hydrate with the lapse of the temperature of thermostated bath, the temperature is still one of the major reasons of R141b gas hydrate formation. The findings suggest a rapid formation method of R141b gas hydrate in the static water.