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In recent years, with the rapid development of China's chemical industry, a large number of new technology, new products, new devices are emerging. The chemical production process has a high temperature, high pressure, cryogenic, continuous, automated, large-scale production unit of raw materials and products for most of flammable, explosive, toxic, harmful, corrosive substances. Compared with other industries, the more dangerous hazards involved in chemical production process, these dangerous hazards under certain conditions, will be transformed into an accident, thereby endangering the safety of people's lives and loss of property, or even cause serious pollution to the environment. In order to achieve safe production, the implementation of the principle of \work checks, after more than ten years of development, security evaluation (Engineering) labor safety and hygiene single construction project from the initial pre-evaluation of the development of today's safety pre-evaluation, the four major categories of safety acceptance evaluation, safety evaluation, special security evaluation laws, regulations and administrative procedures have been equipped with a complete, proved: safety evaluation work not only to improve the safety level of the enterprises and the nature of the production equipment, but also can provide a powerful decision-making and supervision and inspection at all levels of production safety supervision and management departments support. To carry out safety assessment, eliminate hidden dangers and prevent accidents a fundamental strategy. With the safety evaluation of the work carried out, some of the urgent need to study the new issues followed by the question of the applicability of the method of evaluation in which security is a very important and urgent research topic. The Safety Evaluation applicability refers to the safety evaluation of the project to achieve its intended purpose or ability to achieve the specified purposes. The chlor-alkali industry is an important basic chemical raw materials industry, and plays an important role in the national economy. Production of chlor-alkali industry includes the production of caustic soda and polyvinyl chloride, the process is complex, and involve large quantities of flammable, explosive, high temperature and toxic, corrosive hazardous chemicals, the production process also contains a number of high-risk operation. In recent years, China's chlor-alkali chemical plant accident-prone, and take the chlor-alkali chemical plant safety evaluation is an effective accident prevention. In this paper, chlor-alkali chemical projects, for example, describes the characteristics of the different evaluation methods, combined with the chlor-alkali chemical plant's actual safety checklist, risk evaluation method, preliminary hazard analysis, Dow Chemical, fire, explosion risk index evaluation method, risk of actionable research, ICI Mond fire, explosion, toxicity indicators evaluation method, the dangerous consequences analog analysis safety evaluation method for the main place of the chlor-alkali chemical plant safety evaluation study the safety evaluation of the different types of methods in the chlor-alkali production process how to apply, and quantitative calculation of the harmful consequences of the fire, explosion and poison leak, production of domestic chlor-alkali chemical plant security, emergency rescue, safety supervision, better guidance.
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