2010 Chemical Explosion accidents increase the formulation of preventive measure
SINGAPORE network information, since the beginning of 2010, China has undergone two successive blasting accidents, respectively in January-rich Star in Beijing Tongzhou chemical explosion accident, and on February 24 in Starch Co., Ltd. Hebei Qinhuangdao Hua Li starch blasting accident.
1 24, Tongzhou District, Beijing Chemical Co., Ltd. Guangzhou Fu Star deflagration accident occurred, killing two workers were killed.
Detailed report Blast site 2 24, Li Hua Starch Co., Ltd. Hebei Qinhuangdao starch blasting accident, closing at 8 o'clock on the 26th, Qinhuangdao explosion accident and rescue personnel on site clean-up has been completed, by the rescue headquarters confirmed that the incident occurred When on-site total of 107 people, of which 39 were safe, there are already 19 people were killed and 49 injured, 8 were seriously injured.
Detailed report Deflagration is the hidden threat to one of the important chemical production, especially in the chemical materials storage process, the prevention of deflagration is an important aspect of security precautions. Although up to now occurred in 2010, two deflagration cause of the accident investigations are, however, the information disclosed so we must appeal to the chemical and food processing enterprises must strengthen their awareness of security blasting. To strengthen awareness must start from the correct understanding.
What is blasting? Chemistry laboratory simulation test plan starch dust explosion
Particles suspended in the air, combustible dust, very small surface area, oxygen increases the oxidation system, once in a fire burning, severe oxidation occurs, generating a lot of heat and high pressure, the formation of an explosion. Moreover, a point on the dust explosion, by the flames and heat, as the new fire, it blew the dust of another point, or the impact of the explosion, a lot of dust being blown up there, the rapid formation of new explosive mixtures , under high temperature in the flame, once again exploded. Dust explosion should have three conditions: First, tiny dust to be suspended in the air; Second, dust and air mixture reaches a certain concentration; Third, there is fire, even a very weak spark, or Mars, may cause an explosion .
What are the characteristics of dust explosion?
(1) many times the maximum explosion characteristics of dust explosions;
(2) dust explosion required a higher minimum ignition energy, usually in the tens of mJ or more.
(3) compared with the combustible gas explosion, dust explosion pressure is relatively low and high pressure continues for a long time the energy released large, destructive.
What are harmful dust explosion? (1) has a strong destructive. Dust explosion involving a wide range, coal, chemical, pharmaceutical processing, wood processing, food and feed processing sectors occur. Such as the 1952? 1979, Japan 209 various types of dust explosion, the casualties were 546 people, to crush flour dust separation engineering works and more outstanding, each 46. Federal Republic of Germany 1965? 1980, 768 various types of dust explosion, the more serious of which is wood flour and wood dust and the explosion of grain feed, accounting for 32% and 25%. In recent years, China's annual frequency of occurrence of dust explosion: an explosion of local explosion 150-300 times the system 1-3 times, and increasing. These dust explosion occurred in China, especially the system exploded, causing serious damage, only 1987 of Harbin flax linen dust explosion killed 58 people, injured 177, the direct economic loss of 8.82 million yuan.
(2) prone to secondary explosions. The first blast blast to the device or on the ground deposition of dust blowing up there, shortly after the explosion in the explosion center will form a negative pressure around the fresh air will fill the outside-in, forming the so-called "back to the wind "Raising the dust and mix the remainder of the first explosion caused the fire ignited under the second explosion. Secondary explosion, the dust concentration is generally much higher than the first explosion, so powerful secondary explosion is much greater than the first secondary. For example, a sulfur flour mill, grinding machine internal explosion, the explosion along gas pipeline from the grinding machine spread to cyclone, cyclone occurred in the second explosion, blast wave through the explosive to generate after the cyclone The gap spread to the workshop, raised the settlement process equipment in buildings and sulfur dust, then exploded.
(3) can produce toxic gases. One is carbon monoxide; the other is the explosive (such as plastic) its decomposition of toxic gases. Gas production often results in a large number of livestock poisoning after an explosion injury, must pay full attention.
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