Use characteristics of explosion-proof cable in explosive dust environment
At present, with the rapid development of industrialization in our country, dust explosions occur many times in the production process of enterprises, which affect the property losses of enterprises and cause unsafe factors for enterprises. Enterprises must raise their awareness of safety, only in this way can unnecessary losses of enterprises be reduced. How much harm will dust explosion do? How can we prevent it? Main hazards of dust explosion (1)It is extremely destructive.
Dust explosion involves a wide range of departments such as coal, medicine, chemical industry, wood processing, grain and feed processing. (2)Dust explosion is prone to secondary explosion.
The first explosive air wave blows up the dust deposited on the equipment or the ground. In a short time after the explosion, the explosion center will form a negative pressure, and the surrounding fresh air will be filled in from outside to inside, the so-called 'return wind' is formed, which is mixed with the raised dust and causes the second explosion under the ignition of the residual fire of the first explosion.
In the second explosion, the dust concentration is generally much higher than that in the first explosion, so the power of the second explosion is much larger than that in the first explosion.
It will affect the explosive combustion of electrical and equipment circuit control systems, and the generation of different toxic gases will often cause a large number of casualties after the explosion, which must be paid full attention.
How to prevent dust explosion, first, to reduce the concentration of dust in the air.
Adopt equipment with good sealing performance to minimize dust flying and escaping, and at the same time install effective ventilation and dust removal equipment to strengthen cleaning work. Second, it is necessary to control the indoor temperature. Third, it is necessary to improve equipment and control fire sources.
In places with dust explosion hazard, fourth, dust enterprises must choose the national quality standard explosion-proof electrical, explosion-proof motor, explosion-proof switch, explosion-proof lighting, intrinsically safe explosion-proof cable is more important, bi Guohua, manager of Tianjin cable General Factory, reminded customers that explosion-proof IA grade must be adopted when using intrinsically safe explosion-proof cables. (
Explosion-proof control cable, explosion-proof signal cable, explosion-proof computer cable, explosion-proof coaxial cable)
Under normal working conditions, when there is one or two faults in the explosion-proof Cable, the explosive gas mixture cannot be ignited.
In Type IA explosion-proof Cable, the working current is limited to less than 100mA, which is suitable for chemical industry, dust enterprises, etc.