Beehive burner

A wood waste burner, known as a teepee burner or wigwam burner in the United States and a beehive burner in Canada, is a free-standing conical steel structure usually ranging from 30 to 60 feet in height. They are named for their resemblance to beehives, teepees or wigwams. A sawdust burner is cylindrical. They have an opening at the top that is covered with a steel grill or mesh to keep sparks and glowing embers from escaping. Sawdust and wood scraps are delivered to an opening near the top of the cone by means of a conveyor belt or Archimedes' screw, where they fall onto the fire near the center of the structure.

For the beekeeping tool, see Bee smoker.
Beehive burner in Canada

Teepee or beehive burners are used to dispose of waste wood in logging yards and sawdust from sawmills by incineration. As a result, they produce a large quantity of smoke and ash, which is vented directly into the atmosphere without filtering, contributing to poor air quality. The burners are considered to be a major source of air pollution and have been phased out in most areas. There are a few beehive burners remaining in Western Canada.

Teepee burners went out of general use in the Northwestern United States in the early 1970s, and are prohibited from operation in Oregon,[1] as well as southwestern Washington state.[2] The wood waste is now used as a component in various forest products, such as pellet fuel, particle board and mulch.

gollark: I'm pretty sure we *have* done the ingroup/outgroup thing for... forever. And... probably the solutions are something like transhumanist mind editing, or some bizarre exotic social thing I can't figure out yet.
gollark: I mean that humans are bad in that we randomly divide ourselves into groups then fiercely define ourselves by them, exhibit a crazy amount of exciting different types of flawed reasoning for no good reason, get caught up in complex social signalling games, come up with conclusions then rationalize our way to a vaguely sensible-looking justification, sometimes seemingly refuse to be capable of abstract thought when it's politically convenient, that sort of thing.
gollark: No, I think there are significant improvements possible. But different ones.
gollark: I'm not talking about humans being bad in that sense, myself.
gollark: Ah, yes, right the second time.

See also

References
  1. "Oregon Administrative Rules: Oregon Department of Environmental Quality: Division 234: Emission Standards for Wood Products Industries". Oregon Secretary of State. Retrieved 2012-02-18.
  2. http://www.swcleanair.org/regs/SWCAA_400_Nov15_2009.pdf
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