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Research on Bearing Capacity of Urban Medium Voltage Gas Network

Author: LiuZuo
Tutor: JiaoWenLing
School: Harbin Institute of Technology
Course: Heating, Gas Supply , Ventilating and Air Conditioning
Keywords: urban gas medium voltage network gas flow of regional station operatingcondition bearing capacity macroscopical model
CLC: TU996.62
Type: Master's thesis
Year: 2012
Downloads: 43
Quote: 0
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Abstract


With the adjustment of China’s energy structure, the proportion of natural gas inthe energy structure will increase, and natural gas will become the city’s main energysources. And, the development of natural gas market will promote the development ofurban distribution network. At present, most of the existing medium voltage pipe arestill in service stage during a long period in the future, but as the city gas marketdemand is increasing, the current operation of gas network has been unable to meet thedemand of city gas market, we need to optimize the existing network operationcondition to maximize the gas transmission capacity, that’s the bearing capacity of thenetwork. This will not only save a lot of money, but also improve the whole hydraulicconditions, and better meet the needs of the national gas production and requirements.First of all, this paper simulates and studies the flow supplied by regional stations.Let one low pressure gas network having four stations as research target and dohydraulic calculation with the software. According to the least square method andMathematica mathematics calculation software, we fit out the relation formula betweenstation flow and it’s position in the low pressure gas network, then study one method toapply the formula to the actual network, and put forward the area correction coefficient、flow flow correction coefficient and site criteria; Then, we set up simulation modelingof part of gas pipeline and adjust the friction coefficients by the equivalent diametermethod, on the basis of the limited pressure points collected by SCADA system, andmake the netwok simulation condition approximate the actual operating condition in theallowable error range; And then,on the basis of simulated condition, we study themethod to calculate bearing capacity in different operating conditions of part ofnetwork,and by partial network extends throughout the medium pressure gas pipeline,and research and analyse bearing capacity calculation method of the whole network;Finally, from the point of view of gas supply dispatching of the city gas transmissionand distribution system, this article expounds the macro model method of the operationcondition, through the analysis of macroscopical model applicable conditions, wediscuss and analyze it’s applicable range and applications note.The flow fitting function studied in this paper provides a method to determineregional station’ flow; Either hydraulic calculation or macro model，both provide amethod to study bearing capacity of city gas pipeline network,and provide a theoreticalbasis of the city gas development planning and renovation project.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > City gas supply > Gas Transmission and Distribution > Gas pipeline network
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