Computer Analysis On Supplying Ability Of Urban Gas Pipe Networks System After Gas Source's Alteration

Using natural gas(briefly NG) as the main fuel is one of the realities that Shenzhen will to face before long, with the starting of LPG project. The change from LPG into NG of Shenzhen's gas source is in processing. In the process of change from LPG into NG of city's gas source, replacement of gas source will leads to a lot of technical problems, such as: the adaptation of the equipments, apparatus is very important, meanwhile the adjustment of the pipe-system's frame is also a very difficult problem.For the historical reasons, the gas pipe-system of shenzhen is formed by small ward's pipe-system. The possibility of replacement of NG has been taken into account in the small ward's pipe-system design, hence, in term of the pipe-system's frame, there should not be much trouble in the replacement of NG source.However, the conjunction between wards didn't care the adaptation of the whole pipe-system, in the course of Shenzhen's gas pipe-system's change from small ward pipe-system into city's large scale pipe-system, as a result, after replacement of gas source, the attention should be paid to the entire transport capacity of the pipe-system.In this paper, the computer method of pipe-system's analysis is introduced, also the computer program of pipe-system's checking is given out. Then more detailed analysis on hydraulic state of current Shenzhen's gas pipe-system can be done by computer analytic methods, especially when the gas source is connected to city's pipe-system, the influence resulted by junctions on the transport capacity of pipe-system has been computed. The results will offer reliable and scientific reference to how to use the city's pipe-system's transport capacity completely and how to select a proper junction.Additionally, outside of shenzhen there is no gas transport main pipe, when the NG system was constructed. The outer pipe-system is dispensable.After analysis on calculation results, it will offer some theoretic reference to how to exploit the function of high pressure system in gas transport and how to select Shenzhen's high pressure NG pipe-system route.