Posted by Cody CBD on August 24, 2009 at 00:18:00 from (72.21.74.211):
In Reply to: Question on hay fires? posted by Larry here on August 23, 2009 at 21:24:40:
What you are hearing about is called spontaneous combustion by fire safety types. Simply stated, when the heat in a material exceeds the material's ignition point and sufficient oxygen (air) is present the material will begin to burn. Different materials have very different ignition points. In the natural world a simple rule of thumb says the denser a material is the more heat it requires to burn, hence, a single match will not start a 2x4 burning but it will ignite a bale of hay because the hay is fine grass and/or alfalfa. In spontaneous ignition the heat is generated in the same manner as in sewage systems - natural decomposition of biological material by bacteria and fungi (fermentation). When hay is baled damp more organisms can grow generating more heat inside the bale thus raising the temperature inside the bale quicker than heat can be dissipated to the outside. When that heat exceeds the ignition point of the hay it begins to burn. Dry hay does not support as much fermentation so less heat is generated inside the bales. The process is the same regardless of the bale shape or size. Larger bales dissipate heat slower than small bales BUT if small bales are stacked tight, as in a shed or barn, they will hold as much heat as larger bales. Hay fires are hot, dirty and very time/water consuming to extinguish - be careful to buy dry hay!!!
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