1 Explosion-proof electrical equipment selection

Petrochemical enterprises in the explosion-proof electrical equipment selection needs to pay attention to more content, in particular, the following should be the focus of comprehensive consideration. First of all, in a comprehensive analysis of the explosion-proof structure, type of electrical equipment and hazardous area zoning and other content on the basis of selecting the appropriate electrical equipment. In general, the different environments used to prevent the existence of certain differences in electrical equipment, so the choice of electrical equipment should analyse the environment belongs to the explosive dust environment or explosive gas environment, especially in the petrochemical enterprises in the more explosive gas environment, the choice of electrical equipment should be based on the prevention of gas explosions, such as DIPCT6 / d Ⅱ BT4 and so on. Explosive dust environment DIP is the main explosion-proof mark, by the DP and DT type of points, which DP for the dust-proof type used in combustible behaviour 11 area and combustible non-conductive dust environment, and DT for the dust-tight type, in the explosive dust 10 area and other explosive 11 area environment is more commonly used. In the synthesis of the above, and then combined with the place of the ambient temperature and type of selection of suitable electrical equipment. In addition, when the environment at the same time the presence of combustible fibres, dust and explosive gases should be selected when the dust and gas double explosion-proof equipment, such as Exd Ⅱ CT4 or DIPA21T4 Secondly, the group and level of explosion-proof electrical equipment should be higher than the group and level of the explosive gas mixture. Especially when more than two flammable substances, the highest degree of danger should be the group and level of choice of explosion-proof electrical equipment. At the same time, to determine the level of equipment should be based on the environment of explosive gases may occur in the selection, but also should take into account the ambient temperature and other content. Finally, explosion-proof electrical equipment should be selected taking into account the impact of sand, mould, chemical and other factors to ensure that the performance will not be affected by the above factors and reduce. In addition, 0-2 zone electrical equipment selection should focus on: First, electrical equipment such as sparks, arcs from time to time, to avoid in the installation in the 1 zone. Secondly, despite the excellent performance in terms of temperature rise, safety performance is reduced in the event of a failure, and therefore should not be used in Zone 1.

2 Explosion-proof electrical equipment safety application strategy

Oil companies should combine the characteristics of the industry, a comprehensive analysis of the application of explosion-proof electrical equipment rules, and actively explore the application of explosion-proof electrical equipment strategy to create good conditions for safe production.

2.1 Attention to the procurement and use of explosion-proof electrical equipment

For petrochemical companies should be fully aware of the role of explosion-proof electrical equipment in safe production, strict procurement. Explosion-proof electrical equipment on the market today are many types of electrical equipment in the selection of explosion-proof electrical equipment should be selected to meet the national norms of the equipment, while carefully check whether the professional bodies issued by the certificate of conformity and production license. Such as the use of foreign imports of equipment should be carefully checked to see if it has China's professional inspection agencies issued by the explosion-proof licence. In addition, in order to ensure that the performance of explosion-proof electrical equipment to give full play to, should be strictly based on the instructions for the use of electrical equipment to operate.

2.2 Strengthen the professional training of technicians

Technicians operating level to a certain extent affects the safe operation of explosion-proof electrical equipment, therefore, petrochemical companies should pay attention to the professional training of technicians, and constantly improve the operating level of technicians. On the one hand, the organisation of technical personnel to learn safety production norms and standards, to improve the awareness of technical personnel safety production. On the other hand, encourage technicians to strengthen the study of explosion-proof electrical equipment professional knowledge, fully understand the theory of operation of different explosion-proof electrical equipment, to lay the foundation for its formal operation. In addition, petrochemical companies should regularly organise technicians to visit other advanced units to learn from their advanced experience, and apply it to the operation and management of explosion-proof electrical equipment, effectively improve the professional level of technicians, for the safety of explosion-proof electrical equipment to do a good job paving the way.

2.3 Attention to explosion-proof electrical equipment maintenance

Explosion-proof electrical equipment will inevitably appear in the later use of some faults, resulting in explosion-proof performance is reduced, therefore, in order to avoid dangerous occurrences, petrochemical companies should be the maintenance of electrical equipment as a priority to be implemented. Specific reference to the following: first of all, the maintenance personnel should regularly and carefully check the explosion-proof electrical equipment explosion-proof combined surface, to avoid falling into a large amount of dust. At the same time, timely removal of corrosion on the surface of the explosion-proof. In addition, tighten the junction box, in particular, should tighten the bolts to ensure that the relaxation device is in the best condition. Secondly, the electrical line access to explosion-proof electrical equipment should be strictly based on the electrical code standards for lap. And the use of the distribution box, junction box and the feeder device should be explosion-proof. In addition, cable and wire laying should meet the explosion-proof standard requirements. Again, explosion-proof electrical equipment such as grounding, alarms, interlocking devices and other ancillary equipment should be complete, especially zero and grounding should meet the design and specification requirements. Finally, the inspection and maintenance operations, in order to avoid the occurrence of safety accidents, the power supply should be cut off, and the warning signs hanging in the electric switch, no special requirements prohibit the shell of explosion-proof electrical equipment open. At the same time, avoid opening the observation window of the electrical equipment, isolation sealing box, into the line device, junction box.

2.4 focus on explosion-proof electrical equipment application details

Whether the power supply is stable is an important factor affecting the normal operation of explosion-proof electrical equipment, therefore, the application of explosion-proof electrical equipment should be combined with the petrochemical enterprise production practice and work instructions, reasonable setting of current and voltage parameters of explosion-proof electrical equipment, to avoid exceeding the rated current and voltage, especially for the inlet and outlet should pay close attention to the heat situation. In addition, such as explosion-proof electrical equipment in the environment of steam or gas explosive mixtures, should pay attention to the surface temperature rise of electrical equipment and temperature considerations, will be set in the specification of the reasonable range. Especially when there are fibre or dust explosives mixed environment should be electrical equipment surface temperature control within 125 ℃.

3 Conclusion

Petrochemical enterprises may be more explosive places, therefore, in order to ensure that the enterprise production, operation of the safe implementation of the work, explosion-proof electrical equipment should be selected and applied to the due height, in particular, should be combined with the actual development of their own safety application of the relevant strategies to ensure that the explosion-proof electrical equipment to give full play to the performance of the petrochemical enterprises for the safety and stability of the operation of the escort.