Compressing wood gas into propane tanks (Video)
There is somewhat of a debate in the woodgas community as to whether or not woodgas should be compressed. The naysayers are in the majority in this case, and for good reason. Woodgas, syngas, or producer gas—all synomomous—is low in caloric value, approximately haf that of gasoline. The energy it take to run the compressor is considerable. From a net-energy perspective, it doesn't make a lot of sense. In fact, the critics point to the simple fact that gasification is more of an on-demand production method. The energy is actually stored in the wood, or charcoal (if you are doing charcoal gasification).
However, with all that being said, there is the benefit of having gas on-demand. Perhaps it's late at night, and who would want to go start up the gasifier when you could turn a valve. Think of this like you would propane or butane. So, if you're convinced that compressing woodgas is a good fit for you, this article and video is not a bad way to go.