In addition, when the heat energy in a combustible material reaches its ignition point, it will combust… Without an ember or “flame”.
This is a primary component of “crown fires”, in which adjacent tree crowns “instantly combust” due to the temperature reach the ignition point of the leaves, branches, etc.
. 4 Elements of the Fire Tetrahedron
The fire tetrahedron is a concept used to explain the four key elements needed for a fire to ignite and sustain itself. This concept builds off of the fire triangle by introducing a fourth element called the chemical chain reaction. This addition highlights the continuous, self-sustaining nature of fire.1 Here is each element broken down:
Fuel: Any combustible material, including solid, liquid, or gas, serves as fuel. Without fuel, a fire cannot burn, which is why removing it or letting it run out extinguishes the fire.
Heat: Heat raises fuel to its ignition point, initiating combustion. Sources like friction or sparks provide sufficient heat, while suppression methods like water reduce the temperature below the ignition point.
Oxygen: Fire relies on oxygen or another oxidizing agent to sustain combustion. Depriving a fire of oxygen, using tools like fire blankets or extinguishers effectively smothers it.
Chemical Chain Reaction: This reaction occurs when heat from the initial ignition breaks molecular bonds in the fuel, releasing reactive free radicals. These free radicals then interact with oxygen, creating new molecules and more heat. The additional heat continues to break down more fuel molecules, releasing further free radicals and sustaining the fire. }
If I understand correctly, a blast furnace functions by providing sufficient O2 to speed up combustion to increase energy release, generating higher temperatures.
The Santa Ana winds force feed O2, and after a bit, the fire reaches a “self sustaining” temperature, in which adjacent structures “instantly combust”.
Ie, all buildings must be at least 100m from combustible materials.
ralph