Accidental energy transfer theory
1. Concept of accidental energy transfer theory
Energy is indispensable in the process of production, and human beings use energy to do work to achieve production purposes. Man must control energy in order to use it for work. There are many kinds of energy, such as kinetic energy, potential energy, electric energy, thermal energy, chemical energy, atomic energy, radiation energy, sound energy and biological energy, etc. In the normal course of production, energy flows, transforms and works according to people's will under various constraints and limitations. An accident may occur if for some reason the energy is out of control and an abnormal or unexpected release occurs.
If the energy being controlled is abnormal, it can break through the control and be released outwards. Such as high temperature, high pressure to produce the explosion of the container;
If the accidentally released energy is transferred to the human body, and the energy exceeds the human body's capacity, the human body will be injured.
From the perspective of energy, Gibson and Harden once pointed out that the cause of human injury can only be the transfer of some kind of energy to human body, while accident is an abnormal or accidental release of energy.
2. In safety management, hazards are classified into category I and category II according to their roles in the occurrence and development of accidents. The classification of the two kinds of hazard makes the object of accident prevention and control clearer.
The first kind of hazard source is all kinds of energy or dangerous substances which may be released accidentally in the system. Steam at high temperatures and pressures, chemicals, moving or rotating equipment, etc
The second kind of hazard source is all kinds of unsafe factors that lead to the failure or destruction of energy restriction measures. Such as pipelines/vessels for the transmission and control of steam; Chemical storage tanks, protective enclosures outside moving or rotating equipment, etc.
The existence of the first kind of hazard source is the precondition for the occurrence of accidents. The second hazard source is the necessary condition for the first hazard source to cause the accident. The two types of hazard jointly determine the hazard of the hazard. The energy released by the first category of hazard sources is the energy subject that causes injuries or damages to property, and determines the severity of the consequences of the accident. The difficulty of the occurrence of the second hazard source determines the probability of the occurrence of an accident.