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Large-caliber long-distance pipeline purged with nitrogen and technology to the development of replacement direction without isolation , small resistance , high efficiency , safety and reliability , reduce investment , the flow rate is easy to control , and less affected by terrain and pipeline installation , replacement simple , is a very promising new techniques and new methods . However, the domestic has not yet mastered the theory analysis and calculation methods , the application of the technology replacement work there is a larger blindness , many businesses are afraid to use the advanced replacement technology . So , the urgent need the isolator nitrogen replacement technology theory and methods of computation . The research results of the project can be the direct guidance of the isolator production of nitrogen replacement process , bring huge economic benefits for the oil field gas production safety . This paper Application Fluent software numerical simulation of the process of commissioning of the gas pipeline replacement , respectively, have been purged with nitrogen, air and gas tube replacement nitrogen mixed gas length with inlet velocity variation , and that two additional replacement as the inlet velocity phase of the mixed gas length and the average growth rate of the mixed gas length increases , which also increases the amount of liquid nitrogen required . Comprehensive use of the theory of fluid mechanics, heat transfer , and piped technology systems , the establishment of a mathematical model of the gas pipeline media replacement , theoretical analysis of the law of medium replacement , pressure, flow rate , pipe diameter and length of the replacement process reasonably determine the the replacement process parameters . Using numerical software Matlab and artificial neural networks and artificial intelligence technology , computing software developed to automatically correct the parameters and the direct guidance of long-distance natural gas pipeline into operation and discontinued the repair process in the medium pipe replacement work . The study provides a theoretical basis for isolator production of nitrogen replacement .
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