PREVENTION OF IGNITION SOURCES FORMATION DURING THE VERTICAL TANKS FEEDING BY DIELECTRIC CARBOHYDRATE LIQUIDS
Array
Keywords:
electrostatic charge, send-receive device, liquid flows, double electric layer.Abstract
The causes of formation of an additional electrostatic charge at loading of dielectric hydrocarbon liquids (LHCL) in tanks are revealed. The results of experimental laboratory and field tests of an explosion-proof send-receive device are presented, which allows to reduce the formation of surface electrostatic charge that is formed directly in the tank by increasing the residence time of the fluid flow in a flooded state and preventing the movement of the fluid being loaded on the walls of the tank.
It is established that the movement of liquid on the walls of the tank leads to the destruction of the previously formed double electric layer on the vertical walls, which contributes to the increase in the value of charge on the liquid surface. Thus, the more intensive the process of filling the hydrocarbon liquid, the greater the charge is formed on the surface of the liquid, and the greater the likelihood of a discharge, which power will be sufficient to ignite the hydrocarbon liquid.
An explosion-proof send-receive device for vertical tanks has been developed. It works as follows: in the PSR section, there is always a liquid that stays there and after the product is drained through the drain pipe. In this case, the amount of product residue in the reservoir will depend only on the height of the location of the section and its perimeter.
It is shown that using an explosion-proof loading device, the formation of surface charge is reduced by a factor of ten, which will reduce the possibility of forming such a level of electrostatic charge, which will lead to the ignition of the steam-air medium in the tank. The research results can be used in the design of receiving and dispensing devices in reservoir construction and monitoring the magnitude of the electrostatic field above the surface of the liquid in various types of storage.
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