Old 55 gallon oil drums are usually converted into fire buckets with only a few holes in the wall. Generally speaking, they are very suitable for use, but they may have very smoking output, especially in case of overload. However, this design from [building materials are interesting] combines two drums into a barrel to create a barrel with higher combustion efficiency and less smoke! (video, embedded below.)
Note that the ventilation hole in front of the cylinder outlet supplies oxygen to the fire.
Through some ingenious steel cutting and folding, a combustion barrel is created from the original two, which helps to completely eliminate smoke through two ingenious design features. First, the air inlet at the bottom of the barrel provides sufficient air for the fire. Secondly, the bucket in bucket design, combined with some intelligent vents, helps to provide fresh air for the fire before it leaves the bucket. This additional oxygen supply helps to produce secondary combustion at the outlet, burning off all substances normally discharged in the form of smoke.
The work involved in this design is far more than digging a few holes in the old drum, but the results are undoubtedly impressive. The output of the smokeless combustion barrel looks hotter and cleaner. We have also seen similar designs for workshop heating. Play the video after the break.