Complete beginner here!
While googling I came across a design for burning waste oil. I did not save it and cannot find it again!
It used small gauge copper pipe twisted round a broom shaft then turned back so an oil jet (gravity only) was directed back through the centre of the spiral. The idea is that the flame preheats the oil and by the time it reaches the discharge point it ignites readily. Obviously this needs pre heating to get started. This could be done with butane/propane or wood fire etc
Obviously many of you will be fully aware of what I am trying to describe.
I look forward to replies.
Thanks
Mike