Research On The Impact Of Coal-to-gas Conversion On Natural Gas Pipeline Network And Countermeasure

As a typical clean energy source,natural gas has occupied an increasing market share in the global energy structure due to its advantages in environmental protection and efficiency.In recent years,the country,province and city have continued to promote and win the blue sky defense war,further promote the use of clean energy,and actively promote the implementation of the "coal to gas" policy,which has greatly promoted the development of gas industry in Wudi County.The impact of the coal to gas policy on the pipeline network is mainly reflected in the increase in downstream gas load and seasonal uneven gas consumption,ultimately causing huge pressure on the gas transmission and distribution of existing pipelines.Therefore,measures need to be taken to address various adverse effects to ensure the stable operation of the pipeline network.This paper mainly focuses on the increase of gas volume and uneven gas consumption in Wudi County in recent years,especially the sharp increase of gas volume and uneven gas consumption in winter caused by rural clean heating and industrial coal-fired transformation in the process of coal to gas,to study the extent of its impact on stability parameters such as pipe network pressure and flow,and to draw up specific improvement measures in combination with simulation calculation results and local planning,so as to achieve the purpose of stable operation of pipe network and balance between supply and demand.The research route of this paper: First,we obtained the distribution of natural gas consumption and the status quo of pipeline network in Wudi County from 2015 to 2020 by visiting and investigating.Through the actual gas consumption and gas consumption law,we used three load forecasting methods to predict the total gas volume in 2025,2030 and 2035,and select more scientific forecasting data;Then,with the help of the simulation software TGNET,under the condition of only changing the user demand,the impact of the two situations of pure gas volume increase(static)and gas volume increase with uneven change over time(dynamic)on the component parameters and the overall stability of the pipe network is studied.Combined with the trend image,optimization measures are proposed from the aspects of gas source,pipeline,peak shaving,etc.Finally,TGNET is used again to conduct steady simulation of the optimized pipe network,Verify the feasibility of the plan and provide reference for the analysis and optimization of pipeline networks in cities with similar gas consumption behaviors.The main conclusions of this paper are as follows:;(2)Based on the changes in gas consumption in previous years,the energy consumption elasticity coefficient method and regression analysis method are used to predict the total gas consumption in 2025,2030,and2035.The classification prediction method is used to analyze the different gas consumption indicators and non-uniformity coefficients of various users,and the gas consumption is predicted and summed separately.The first two methods have limitations,only considering the correlation between directly related factors,and have a significant deviation compared to the classification prediction,It is best to use combination prediction method or directly use classification prediction method,and finally determine the prediction data as 249 million m3,359 million m3,and 495 million m3;(3)Using TGNET for dynamic and static simulation analysis,the static simulation results only indicate the impact of an increase in user average gas consumption on the pipeline network.The results show that the expected parameters of some pipeline components in 2030 and 2035 have exceeded the specified operating range;The Dynamic simulation results show that the gas consumption also fluctuates unevenly with the month,day and hour as the gas consumption increases.The results show that the parameter settings of most user terminals and pipelines cannot meet the requirements,and the average daily gas consumption in winter is far more than the gas supply scale,so seasonal peak shaving scheme is needed to meet the gas demand;(4)For the parameter change trend of specific elements in the simulation results,on the premise of combining the planning and design content of Wudi County,specific improvement measures were determined from three aspects: increasing gas source points,improving pipe network structure and building gas storage facilities for peak shaving.The pipe network improvement diagram was redrawn,and the TGNET software was used again to bring the 2035 forecast data to prove its feasibility.The results showed that the parameters were in a stable range,and the scheme was feasible;(5)In view of the policy guidance in recent years in Shandong Province,combined with the successful cases of similar urban automatic control monitoring systems,the advantages of automatic control systems in LNG storage and distribution stations,intelligent pipeline transportation systems and intelligent gas production systems are compared,and the application prospects in Wudi County are proposed.The addition of intelligent gas systems will improve the automatic control,monitoring and scheduling capabilities of the pipeline network.