Abstract
In order to investigate explosive properties of ethylene-air premixed gas in flameproof enclosure with interconnected structure under pressure piling, a 161.5 mm × 161.5 mm × 250 mm cylindrical flameproof enclosure and a 161.5 mm × 161.5 mm × 500 mm cylindrical flameproof enclosure connected by a partition with a hole (inner diameter of 15 mm) were studied. A mathematical model of the fluid dynamics combustion reaction was selected to perform numerical simulations of this structure using the finite volume method. Numerical simulations revealed that under pressure piling, the maximum explosion pressure in Cavity B was significantly higher than that in Cavity A; the maximum rate of explosion pressure rise in Cavity B was significantly higher than that in Cavity A; combustion rate of combustible gas in Cavity B was much higher than that in Cavity A. Results of the study have practical and theoretical significance for the design and installation of flameproof enclosures.
Highlights
Production facilities in petrochemical industry are explosive hazardous environments, which requires the use of flameproof electrical equipment, in order to prevent dangerous sparks or energy generated by equipment components in the on-off, load and fault conditions[1], otherwise, once the comprehensive performance of flameproof safety is abnormal during operation, it is likely to generate electrical sparks, electrostatic discharge, mechanical friction sparks and high temperature, which will form ignition source in an explosive environment
The results demonstrated that changes in the structure of flameproof products could lead to pressure piling and interconnected structure, so that the explosion pressure increased instantly, flameproof enclosure internal structural changes would significantly change the explosion pressure
The burning rate of combustible gas was less than the propagation velocity of the explosion pressure wave
Summary
Production facilities in petrochemical industry are explosive hazardous environments, which requires the use of flameproof electrical equipment, in order to prevent dangerous sparks or energy generated by equipment components in the on-off, load and fault conditions[1], otherwise, once the comprehensive performance of flameproof safety is abnormal during operation, it is likely to generate electrical sparks, electrostatic discharge, mechanical friction sparks and high temperature, which will form ignition source in an explosive environment. The maximum pressure rise rate of flameproof enclosures connected with pipes of Ø = 0.3 cm was higher than that of flameproof enclosures connected with pipes of Ø = 1.2 cm This was due to the rapid combustion of the gas-air mixture of hot combustion products ejected to the opposite side after ignition. Numerical simulation was used to study the characteristics of temperature, pressure and explosion wave propagation in flameproof enclosure with interconnected structure under pressure piling. It provides theoretical guidance for the design of flameproof enclosure with interconnected structure
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