Analysis Of Gas Storage Peak Regulation Based On Dynamic Simulation Of Urban High-pressure Natural Gas Pipe Network

With the increasing awareness of environmental protection,the implementation of the “coal to gas” policy and the promotion of air pollution control measures,natural gas has gradually become the primary energy for people's living and industrial production,and its percentage in energy consumption has increased.At present,Natural gas is mainly supplied by pipeline network.With the increase of consumption in the downstream natural gas market,the contradiction between supply and demand of natural gas is increasing as the consumption growth,which has caused certain pressure on the upstream gas supply.In order to protect the people's living and industrial production of gas demand properly,alleviate the contradiction between supply and demand and achieve rational allocation of resources,the urban highpressure pipe network can be used for store gas to undertake the city's demand for natural gas jointly while building gas storage peaking facilities.This paper takes the urban natural gas high-pressure pipe network as the research object,and makes a qualitative analysis on the unsteady flow in the pipe network.Taking the natural gas high-pressure pipeline in a city in North China as an example,the steady-state flow calculation in a fixed time is used instead of the non-steady state.The flow calculation method and the professional simulation software have simulated and analyzed the unstable flow in the high-pressure pipe network of urban natural gas.At the same time,this paper uses the annual equivalent cost method to analyze the two kinds of gas storage methods of high pressure spherical tank gas storage and LNG gas storage.Through the relationship between the unit gas storage equivalent cost and gas storage capacity,the high pressure spherical tank and LNG storage are quantitatively analyzed.The economic applicability of the station.The above calculation results show that:(1)Compared with the calculation results of the professional simulation software,the calculation results of the steady-state flow calculation in a fixed time instead of the steady-state flow calculation are the same as the change trend of the node pressure and the natural gas pipeline inventory.The maximum error of nodal pressure is 4.85%,and the maximum error of pipe storage is 4.63%.This method has certain significance in engineering calculation.(2)When the gas source point which accounts for about 50% of the total gas supply volume of the city failed,the natural gas high-pressure pipe network cannot guarantee the peak of downstream users when the total demand for natural gas in the city changed from dual gas source supply to single gas source supply.With gas load,it is necessary to add a gas storage peaking facility at the most unfavorable point,and the peaking gas volume is about 5% of the total gas volume.(3)In this paper,the annual equivalent cost method is used to establish the fitting function of the annual equivalent cost of unit gas storage and the volume of high pressure spherical tank and the fitting function of the annual equivalent cost of unit gas storage and the volume of LNG.By calculation and comparison,the LNG storage and distribution station is more economical in this case.