Fire and explosion hazard analysis of synthetic re

Summarize the fire and explosion hazard analysis and preventive measures in the production process of synthetic resin

the main raw material of plastic is synthetic resin. The monomers of synthetic resin, such as acetylene, ethylene, propylene, formaldehyde, benzene, etc., are flammable and explosive substances, and the production process is often carried out under high temperature and high pressure, which has a certain risk of fire and explosion. In the production process, there will also be static sparks, equipment friction and fire and other faults, which will be caused by a little carelessness. Therefore, users must not think that the more they buy, the better, causing a huge fire. The explosion of chemical production equipment is often accompanied by heating, luminescence, pressure rise and other phenomena, which has a great destructive effect. The main forms of explosion damage are: shock, shock wave and fire

common fire and explosion in synthetic resin plants are as follows:

1 Fire and explosion of mixed gas

combustible gas and liquid vapor form an explosive mixture with air. At a certain concentration, the explosion caused by the propagation of combustion wave or explosion wave is called the explosion of mixed gas

in synthetic resin plants, the leakage of combustible gas or steam from process pipes, equipment or containers, or the leakage of air into containers containing combustible gas will produce mixed gas, and explosion accidents will occur in case of fire source

    2. Dust explosion

dust of combustible resin solids, such as high-pressure polyethylene, polypropylene, nylon resin, polystyrene, will produce dust clouds during granulation, drying, transportation, or in bag filters. When this dust cloud reaches a certain concentration, once it encounters a fire source, it will produce intense combustion and explosion, which requires the use of the most effective polyurethane foaming equipment for metering, mixing and spraying. This explosion is called dust explosion

generally speaking, dust that is easily charged is more likely to cause explosion. In the production process, various resin dusts always carry a certain charge due to mutual collision, friction, corona discharge and other reasons. Most of the dust of synthetic resin may achieve new breakthroughs in the fields of automobile, high-speed railway, aviation and industrial utilization as very fine solids. Particles are suspended in the air and adsorb oxygen in the air. The finer the dust particles are, the more oxygen is adsorbed, and the more prone it is to explosion. At the same time, the finer the dust is, the lower the ignition point is, and the lower the lower limit of dust explosion is

the explosion pressure of dust is related to the chemical composition of dust. For example, the maximum dust explosion pressure of polystyrene and polyethylene are 0.293MPa and 0.588mpa respectively. In contrast, the maximum dust explosion pressure of polyethylene is higher than that of polyphenylene

    3. Steam fire and explosion

at present, the popular packaging on the market is mainly plastic and paper

the low boiling point liquid in the chemical storage tank is heated or exposed to sunlight, which increases the temperature, increases the vapor pressure in the tank, and will explode at the moment of vaporization