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Taiwan just happened "dust explosion" What is what?
27 evening, Taiwan's new Taipei Water Park Eight Immortals party activities take place in the last five minutes dust explosion accidents, the new Taipei City Health Bureau, at 10:00 on the 28th released a list of the Eight Immortals park injured 516 people were treated in 39 hospitals, injured over 194 people. Because wearing swimsuits, injured many it is a large area burns. There are four confirmed injured mainland tourists and a membership in mainland Taiwan nationals enrolled female students.
Currently, the head of the party activities have been brought back to the police investigation. The new North Mayor Chu said it would thoroughly investigate the fire cause and accountability.
It is understood that the incident, the park's "color party", known as Asia's largest color party, not the first time held that this attracted 12,000 participants. According to the site described the people, gradually coming to an end when the evening events, from stage left, right, in front of their own to the final out of the sky colorful spray powder. After the powder emission, in front of the stage impressively large bursts of fire, and then the overwhelming flames quickly engulfed the front of the stage wearing a swimsuit cool people.
It is reported that the party throwing colored powder and colored water to meet the expression of renewal, pray for cereals harvest, while the island's colorful powder is widely used in recent years, road race, parties and other recreational activities.
Why these colored powders that can cause an explosion? News mentioned in the "dust explosion" What is what? (The following order from the network)
1. What is a dust explosion
Dust in the explosion limits, experiencing a heat source (flame or high temperature), flame spread instantly throughout the mixing space dust, chemical reaction fast, while releasing large amounts of heat to form a high temperature and pressure. Because of this process, there have been an elevated pressure will produce a shock wave, and therefore, the explosion will cause great damage.
2, which dust is explosive
All was fine powdery solids are called dust. You can burn and dust called a combustible dust explosion. Seven types of material dust is explosive:
Metals such as magnesium, aluminum and the like;
coal;
Grain, such as wheat, starch;
Feed, such as blood meal, fish meal;
Agricultural and sideline products, such as cotton, tobacco;
Forest products, such as paper powder, wood flour;
Synthetic materials, such as plastics, dyes.
3, dust explosion Conditions
(1) to the appropriate concentration of combustible dust suspended in the air, forming a dust cloud;
(2) there is sufficient air and an oxidant;
(3) sources of ignition or intense vibration and friction.
Generally considered, as long as combustible dust conditions (1) and (2) have signs of possible accidents.
4, dust explosion process
(1) Suspension of dust carbonized under heat action quickly or gasification to produce combustible gas;
(2) mixing the combustible gas and combustion air;
(3) Dust combustion heat release, flame radiation and heat conduction way to pass near or suspension of dust blowing up there, after which dust is heated gasification combustion cycle. With successive cycle, and the reaction speed is gradually accelerated by vigorous combustion final form explosive.
5, dust explosion characteristics
(1) Multiple explosions is its greatest feature;
(2) The minimum ignition energy required is high, usually in the tens mJ or more;
(3) The pressure rises slowly, high pressure continues for a long time, the energy released is large, strong damage.
6, dust explosion hazards
(1) has a strong destructive;
(2) prone to secondary explosions;
(3) can produce toxic gases.
7, how to prevent dust explosions
(1) reducing the concentration of dust in the air;
(2) temperature control;
(3) control the fire, dust explosion hazardous locations, to use explosion-proof motor, explosion-proof switch lights and the like;
(4) control humidity and oxygen-degrees.
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