Experts advise petrochemical companies to guard against static electricity accidents
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According to experts, static electricity will accumulate on metal equipment, pipelines, and containers to form high potentials. Although the electrostatic electricity itself is not large, it is easily discharged because of its high voltage. The spark of electrostatic discharge can cause burning or explosion, causing personal and property damage. loss. In chemical production, the medium in most production facilities is flammable and explosive, and the ignition energy needed to ignite these substances is extremely low. When flaring, dripping, leaking occur in the production or an accident occurs, flammable and explosive gases, liquid vapors, suspended dust, or fibers and air form a flammable system, which is encountered by materials, devices, structures and human bodies. The weak electrostatic spark can cause fire or explosion and pose a serious threat to safety production. If static electricity sparks go along with the human body and reach the production area, it will create a dangerous source of ignition that is fluid, hidden, and difficult to control.
Therefore, static electricity will bring great harm to safety production, product output and quality, stable operation of equipment, and environmental protection, and cannot be ignored.
Deng Zhiming, chief of the Fengcheng Public Security Fire Brigade in Jiangxi Province, introduced that in the petrochemical industry, there have been many static and fire accidents in recent years. Such as Hubei Jingmen refinery due to sampling, temperature and other operations caused by accidental accidents caused by electrostatic fire; Shanghai Gaoqiao Petrochemical Company tossine due to the rapid rise in static temperature detector caused by fire and explosion; there are companies to install, install When the tank is sprayed with a medium, friction and static electricity cause fire and explosion accidents. In addition to the lag in technical measures, these accidents are mainly related to the lack of attention to electrostatic safety management.
Chen Deming, deputy director of Anhui Fengle Agrochemical Co., Ltd., told reporters that the dry weather in winter, people's skin becomes dry, coupled with the more wear of chemical fiber clothes, it is easy to produce static electricity, if improper operation will lead to safety accidents. Chen Deming pointed out that the main countermeasures for electrostatic hazards are to reduce the generation of static electricity, try to guide or eliminate static electricity, and prevent electrostatic discharge. The method mainly includes grounding method and process control method.
“When people walk, wear, undress, or squat, stand up, they all generate static electricity. After testing, the body’s electrostatic energy is enough to ignite dangerous vapors. In some companies that have solvents such as toluene and xylene, static sparks can easily occur. Burning and explosion accidents.†Chen Deming pointed out that operators should wear anti-static overalls, conductive shoes, work hats and other labor protection supplies; electrostatic discharge should be put off before taking off, in the entrance of flammable and explosive places, the addition of electrostatic discharge grounding handle or handrail , Eliminate body static electricity through touching; It is forbidden to wear clothes or use flammable solvents to wipe clothes in dangerous positions; Wear conductive or gloves that are not prone to generate static electricity during work to eliminate or reduce static electricity hazards; in flammable and explosive positions or In locations prone to static electricity, employees must wear anti-static clothing, clothing and footwear that are prone to static electricity are not allowed, and footwear and footwear must not be worn or undressed; metallic objects that are not related to work must not be carried during inspections.
However, it is understood that some petrochemical companies do not fully understand the seriousness of electrostatic hazards. Each company has safety regulations, but most of them lack targeted anti-static safety measures.
Deng Zhiming suggested that the safety management department should strengthen the inspection and monitoring of the company's anti-static clothing to ensure that the anti-static clothing plays an effective anti-static role and has a good flame-retardant effect. Petrochemical enterprises should strengthen the formulation and implementation of anti-static safety regulations. At the same time, they should address the oper- ators and related management personnel in order to educate and educate the electrostatic safety knowledge and improve the awareness and awareness of the implementation of relevant safety rules and regulations.
Experts emphasized that petrochemical companies should also strengthen the daily management of anti-static safety: if the pipeline for conveying flammable liquids must use conductive rubber, conductive plastic hoses or metal braided hoses, and conductive hoses and metal braids should be reliably grounded Mechanical transmission uses gear transmission as much as possible to reduce the flow rate of liquids, gases, and powders; the delivery of flammable liquids should be based on the internal diameter of the pipe and the resistivity of the medium to select the appropriate safe flow rate, generally should not exceed 1 m/s; pour and inject In the case of liquids, to prevent static electricity from splashing and impacting, it is best to inject from the bottom of the container; it is forbidden to store flammable and explosive liquids that are prone to static electricity in plastic containers; it is forbidden to inspect and sample in the process of installing flammable and explosive liquids. .