Study Of Environmental Risk Assessment And Management For Coal Gasification Industry Company

Coal gasification industry which makes crude mixed gas from partial oxidizing raw coal is the foundation, precursor and key point of coal chemical industry, and the gas is the important raw material to produce fertilize, methyl alcohol, ethylalcohol, dimethyl ether, hydrogen. Whereas, our country is lack of oil, natural gas and rich of coal, so it has become a hot issue to develop coal gasification industry concerning the increasing demand for energy. However, there exist some environmental risks such as fire, blast, toxic leakage in this industry because high temperature and pressure must be applied when coal is gasified, and its products have characters of combustibleness, explosiveness and high toxicity, also the potential risks are caused by transporting and storing huge sum of those products, therefore, in order to reduce environmental accident risk and loss of environmental risk, it is the right time to launch environmental risk assessment in coal gasification industry and establish risk management system. Basing on related researches home and abroad, this paper applies the principle of combining environmental risk assessment with risk management to discuss the methods of establishing environmental risk management system, and also takes Wei-he Coal Chemical Co. Group Ltd as a example to analyze environmental risk and put forward corresponding methods. The main conclusions of this paper are listed as follow,(1) On the basis of researches home and abroad, this paper first clarifies the relationship between risk assessment and other assessments and establishes a whole set of standards and methods, then sets up a system of environmental risk management which is supervised by government and practiced by companies and finally realizes a organic combination between environmental risk assessment and management. (2) Starting from constituents identification, this paper enlarges the extent to identify impact of environmental risk by setting up a system which contains four different levels of lethality, health damage, health impact and ecology impact to classify environmental risk; on the foundation of models for toxicity diffusion and energy transmission, this paper puts forward a optimized and simplified Gaussian puff model; correcting the fault of taking personal risk value as standard in environmental risk assessment before, this paper rises classified standards for risk which apply social and natural risk value.(3) Basing on the conclusion of environmental risk assessment and clarifying the responsibility of governments and companies in risk management, this paper uses risk precaution, reduction, early warning and rescue as object to improve the hierarchy structure of risk management which contains from group of workers to government leaders, and also to set up a system of routine risk management and accident risk management, and finally complete response and settlement scenario for emergencies.(4) There exist accident risks in coal gasification plan operating which may bring about serious consequences, and because the level of consequences related to the risk value which depends on surroundings of company, so related factors which influence accidents and safe distance which is measured by lethal radius must be considered thoughtfully when urban planning and choosing an appropriate site for coal gasification company.(5) The result of risk assessment for Wei-he Coal Chemical Co. Group Ltd demonstrates that the company has a high environmental risk, because the storage tank for liquid ammonia is overloaded which may easily cause fire, blast and leakage; there distribute comparatively dense population in the radius of 1000m near the company, if the accident happens, it may cause a serious consequence. So in order to reduce accident risk, this paper adopt the reduction measures which include cutting down the numbers of storage tanks for liquid ammonia and moving out community in the radius of 1000m near the company, and also establish system of risk management. (6) In the practice of risk management in Wei-he Coal Chemical Co. Group Ltd, the company will set up H.S.E management system, and adopt hazards on-line monitoring and regular checkups, train operation stuffs, establish accident response group and practice regularly, those methods mentioned before will improve risk management system in the company effectively.