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Stone Petrochemical Science and Technology Co., Ltd. (hereinafter referred to Shandong Shida company), leakage occurs during pouring operations liquefied hydrocarbon spherical tanks, fire explosion occurred immediately. Until 20:20 or so, this resurgence has been basically put out fires. A witness on the 'financial' reporters that the fire caused at least four explosions, nine tank surrounded by fire. After the explosion, fire brigade, fire brigade comprising Qingdao, Jinan, fire brigade and other cities, including seven of reinforcements to the scene to put out the fire. Tiger Town Lanshan district party committee issued a notice in the morning, residents from the large stone within five kilometers of science and technology need to evacuate. As at 19:00 on the 16th, the fire has been basically put, the scene is still in a state of siege. Rizhao Steel employees Enlightenment and Shandong Sun Stone at large companies with a chemical park told the 'Financial' reporter, at 7:00 am the fire began to burn around 9:00 explosions have occurred many times, 'loud explosion, a lot of sunshine steel plant glass were shattered. ' Rizhao steel plant from the point of the explosion about 600 meters away. It is understood that liquefied hydrocarbon components generally include; ethylene, ethane, propylene, propane, butene, butane, and other hydrocarbons, as well as trace amounts of sulfur compounds, is a multi-component mixtures. Liquefied hydrocarbons belong to Group A and A Class A fire risk media, with significant fire and explosion hazards. Senior Engineer Institute of Chemistry Huai Jun accept the 'financial' reporters, said, liquefied hydrocarbon explosion at high temperatures, the formation of toxic gases and small molecules of organic alkanes, the latter inhaled respiratory system will cause some damage to the body deposited on the skin after exposure, or corrosion. Rizhao City environmental monitoring station monitoring results show that the explosion occurred underground wind sensitive points NMHC exceeded the standard multiple times between 1 -2.5 times, other indicators are not exceeded. The city's Environmental Protection Bureau, said liquefied hydrocarbon combustion products are mainly carbon dioxide and water. Produces a small amount of non-methane hydrocarbons and carbon monoxide and other combustion is not sufficient conditions. Liquefied hydrocarbon at room temperature and atmospheric pressure can easily form explosive gas mixtures in air. This explosive gas mixture density is generally heavier than air (except methane, ethylene), after the leak prone to accumulate in low areas. Liquefied hydrocarbon ignition energy is very low, a