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Industry NewsWhat is forest fire deflagration?
Time: 2019-04-02 View: 2255
At 17:00 on March 30, a forest fire broke out in muli county, liangshan prefecture, sichuan province. In the action of putting out the fire, affected by the sudden change of wind direction, the forest fire suddenly explodes and instantly forms a huge fireball. Thirty firefighters died, including 27 forest firefighters and three local officials.
What is forest fire deflagration? Bai ye, director of the teaching and research office of the China fire rescue institute, said that forest fire deflagrate usually refers to explosive combustion, which is similar to the "flashover" usually used in forest fire fighting.
Generally speaking, there are two main reasons for flashover. One is the forest combustible accumulation time is long, the occurrence of decay, the production of biogas based combustible gas, sudden fire plus small combustible effect, flashover. Data shows that in the past five years, China´s forest area has reached 3.12 billion mu, becoming the country with the largest growth of forest resources in the world in the same period. In particular, the total stop of commercial logging of natural forests, forests under the accumulation of fuel accelerated, large and small hinggan ling, changbai mountain, northern yunnan, western sichuan these large areas of the original forest, fuel load has reached nearly 20 years peak.
Cause "flashover" another reason is that forest fire to the narrow ridge, valley, steep slope, saddle, caotanggou, mountain rock and other special terrain, the combustible preheating at the same time, burning together, the instantaneous formation of huge fireball and mushroom cloud. "Such as the narrow ridgelines, which are extremely hot under the influence of thermal radiation and convection; In addition, it is easy to form drifting airflow, and the direction of mountain fire is difficult to predict. In fire fighting and rescue, firefighters should detect the fire site, try to avoid dangerous terrain, dangerous vegetation types, and avoid dangerous meteorological conditions and scientific rescue. Remember not to escape with the wind, do not escape to the mountain, do not escape by saddle, etc. Conditional ignition, can follow up no residual fire to avoid the miracle. When there is no way to escape, you can use a wet towel to cover your mouth and nose and wrap your bare skin to rush out of the line of fire.
What is forest fire deflagration? Bai ye, director of the teaching and research office of the China fire rescue institute, said that forest fire deflagrate usually refers to explosive combustion, which is similar to the "flashover" usually used in forest fire fighting.
Generally speaking, there are two main reasons for flashover. One is the forest combustible accumulation time is long, the occurrence of decay, the production of biogas based combustible gas, sudden fire plus small combustible effect, flashover. Data shows that in the past five years, China´s forest area has reached 3.12 billion mu, becoming the country with the largest growth of forest resources in the world in the same period. In particular, the total stop of commercial logging of natural forests, forests under the accumulation of fuel accelerated, large and small hinggan ling, changbai mountain, northern yunnan, western sichuan these large areas of the original forest, fuel load has reached nearly 20 years peak.
Cause "flashover" another reason is that forest fire to the narrow ridge, valley, steep slope, saddle, caotanggou, mountain rock and other special terrain, the combustible preheating at the same time, burning together, the instantaneous formation of huge fireball and mushroom cloud. "Such as the narrow ridgelines, which are extremely hot under the influence of thermal radiation and convection; In addition, it is easy to form drifting airflow, and the direction of mountain fire is difficult to predict. In fire fighting and rescue, firefighters should detect the fire site, try to avoid dangerous terrain, dangerous vegetation types, and avoid dangerous meteorological conditions and scientific rescue. Remember not to escape with the wind, do not escape to the mountain, do not escape by saddle, etc. Conditional ignition, can follow up no residual fire to avoid the miracle. When there is no way to escape, you can use a wet towel to cover your mouth and nose and wrap your bare skin to rush out of the line of fire.
