Simulation Of City Gas Distribution Pipeline And Its Applications

The calculation of waterpower is the key step during the design of gas network of city. Model and method of calculating waterpower of gas network are introduced in this paper. The calculation of distributing gas problem has been well solved by using Newton law.The paper introduces simulation optimal calculation of development in pipeline design. Hydraulic calculation formula and familiar solutions were adopted and sumed up by summarization. Through compared to many techniques for pipe optimization, it offers that we must make use of the adjust measures to local conditions and synthesis appliance of the development principle, which well applies to analyses and distribution manage. This paper establishes the target function of pipe diameter optimization, and utilizes Genetic Algorithm to optimize the diameters of gas networks. The result shows that Genetic Algorithm can apply to pipeline optimization efficiently.The present article forecasted the short load of the city gas pipe net under matlab environment which was founded on the global searching Genetic arithmetic and searching the part of BP net in detail. According to the character of the city gas load, the randomicity, periodicity and the trend of the gas charge can be reflected by the application of BP ANN. GAs and BP ANNs algorithms were joined together and supplemented mutually by optimizing the initial weight s of ANNs with GAs. It provided the academic evidence with design and construction of the storage gas. It proved that this method is efficient and credible by examining the historic data during the load forecasting of the city gas pipe net.The research works about gas load in both domestic and abroad have been reviewed. Based on statistics and modem optimization methods, literatures of gas load forecasting and practice experiences were reviewed and induced, and categories of gas load forecasting have been made from different viewpoints. Forecasting method would be slected in accordance with application need and gas load variation characteristic.The research achievements of pipeline leak detection at home and abroad in recent years has been reviewed. There are two main methods of leak detection, hardware method and software method. The superiority and imperfections of every method in their performance and fields are discussed. The sensitivity of leaks detection method based on dynamic quantity balance cannot satisfy the measuring requirement because of influences of errors and requirements on false alarm and detection speed. The sequential probability ratio test (SPRT), one of hypothesis test methods, is analyzed and improved. In the experimental test, it is found that this method can overcome the SPRT's shortcomings, and it can improve the detection sensitivity and detection speed.