Research And Design Of Gas Station Lightning Protection Technology

Lightning hazard is one of the top ten natural hazards announced by “the UnitedNations Ten Years’ International Disaster Reduction” and there are millions of lightning innature each year. The latest statistics indicate that loss caused by lightning has risen to No.3among those caused by other natural disasters. Therefore, it’s necessary to further analyzeand study the lightning protection technology in gas transmission stations.Lightning is an unavoidable natural phenomenon. Once lightning disaster occur, it willlead to problems in technology, economy and security. With the growth of petroleumindustry and full operation of our strategy of sustainable development, requirements onsecurity, environment and disaster protection are becoming increasingly demanding. Gastransmission stations tend to occupy a large area and many of them are located in open areas,even in lightning prone areas such as seaside. Meanwhile, lightning hazards are prone tohappen because of elements such as a the mass number of process equipments, heightprominence, large areas of metal pipelines and metal oil tanks, frequent emissions of waste oilgas and ventilation during technical operations. Once a serious security accident happens inthe gas transmission station containing huge amounts of energy, it will lead to a graveeconomic loss, ecological pollution, a bad social impact and even threats domestic energysafety. Therefore, how to protect gas transmission stations from lightning disasters, how toensure safe production and how to study the lightning protection technology in gastransmission stations pose an urgent task. As a result, this thesis has bright applicationprospects.This thesis focuses on the research and application of modern and comprehensivelightning protection technology. It elaborates on the reconstruction and improvement ofcomprehensive lightning protection engineering in petroleum and gas systems to achievesafety production in petrochemical industries.This thesis studies the gas transmission station in Qinhuangdao and takes such researchmethods as theoretical analysis, numerical calculation and simulation. It follows the technicalpattern of a combination of field survey, laboratory research, typical protection design andstandard research. It makes a systematic study of lightning safety, direct lightning flashprotection technique, power source and SPD requirements, and lightning monitoringrequirements in the gas transmission stations. Simulation models are applied to potentialdistribution and induced voltage of valve clearance when lightning strikes high-pole lamps, induced voltage of valve clearance when lightning strikes the metal roof of a valve chamberand the vent pipe. Suitable parameters are chosen, analyzed and calculated.Based on a series of research and analysis, a lightning protection reconstruction systemsuitable for QHD-a lighting disaster-prone zone is designed in the thesis. The system consistsof the reconstruction of process system, power supply system, auto-control system,communication system, cathode anticorrosion system and thermal system. The researchfindings can give a basis to lightning protection design, reconstruction and standardization ingas transmission stations and help to improve their lightning securities.