Study On Compressed Natural Gas(CNG) Distribution System Of Small Town

With the improvement of urbanization level in China, the development of Chinese civilian-use gas gradually goes from the city to towns. Undoubtedly, the success of an important energy infrastructure project in the 21st century --the project that transports the natural gas in west China to east areas--provided a good environment for the process of towns'natural gas utilization.However, in city, especially in small towns, there are still serious technical barriers in the field of natural gas supply. If considering savings investment, security and reliability, the development of small towns'natural gas utilization is still not very mature in a sense and this is the reason why small town comes along slowly in the utilization of natural gas.From the perspective of technology, this paper discussed in-depth the gas distribution system technology included in natural gas supply technique with the aim to provide a more scientific technology of design and implementation for small towns'natural gas supply system. Consequently, the focus productions of this research are:1) From the aspect of the design of main gas distribution piping in gas distributing station and from the view of CNG transport tool to gas distribution piping of distributing systems, with the incompressible and compressible fluid being involved, the paper mainly used the flux computation theory of incompressible fluid to theoretically calculate the flow capabilities of different diameters under the condition of high pressure and pressure difference, Meanwhile, specific choice parameters were made about distributing piping design of the evacuate gas pipeline.2) According to the features of high pressure fluid, detailed analysis and calculation are made to describe the numerical functions between temperature and pressure drop in the progress of natural gas throttling and cooling. The author proposed that in common cases, natural recovery of the temperature drop the temperature can be realized in light of the gas pipeline. Then, a new technology was proposed that in small-scale gas supply technology, 1st class heating and pressure adjusting can be canceled.3) In response to the smell-added demand in CNG refueling, after analyzing the characteristic that with titration odorizing system, small gas distribution system can't odorizing in proportion, the author creatively combine orifice metering device's feature of sensing the flux with odorizing equipment, invented automatic odorizing system with simultaneous action of gas flux and provided theoretical basis for producing economic and...