Русская версия English version

Simulation of emergency regimes of a gas pipeline section, taking into account real gas properties

N.N. Yelin, S.V. Kryukov, T.V. Koryukina

Vestnik IGEU, 2017 issue 1, pp. 62—68

Download PDF

Abstract in English: 

Background: Ensuring reliable and uninterrupted supply of gas fuel is one of the most urgent tasks for energy generation systems. Design and construction of gas pipelines require a technical and environmental expert review to evaluate the possible after-effects of an emergency gas escape through pipeline breakages. Emptying the emergency shutdown section of the pipeline is a complex non-stationary process, in which all major parameters are linked. It is very important to know the dynamics of gas outflow to estimate the technological and ecological damage. This will allow reliable planning of the pipeline repair. Most of the known works examine the process as an isothermal outflow of a perfect gas, which may lead to considerable errors in prognosis. Hence, it is necessary to build a mathematical model of the process under study and its computer implementation.

Materials and methods: The critical and subcritical processes of real gas outflow were described by gas dynamics methods, while the gas thermophysical parameters were calculated by the cubic state equation and empirical correlations.

Results: A mathematical model has been developed for simulating the non-stationary emptying of gas pipeline sections in and out of operation. The model accounts for heat transfer with the environment and changes in the real gas thermophysical properties and hydraulic losses occurring while the gas moves to the breakage point. The paper presents the results of computer realization of the developed model and computational experiments. It also shows how the real gas parameters, their changes in the process of gas outflow and hydraulic losses on the way to the breakage point affect the main process characteristics.

Conclusions:The suggested mathematical model and its computer implementation allows predicting of the emptying dynamics of a gas pipeline section out of operation and breakage localization for the section in operation by the changes in pressure and gas flow rate at the section end. The increase in calculation accuracy is reached by refusing from some common assumptions. It is recommended to use this technique for planning repair works.

 Key words: emergency regime, gas outflow dynamics, mass flow rate, discharge process, breakage localization, gas pressure, hydraulic losses.

References in English: 

1. Lurye, M.V., Neklyaev, A.V. Ob odnom opasnom yavlenii, soprovozhdayushchem istechenie gaza iz gazoprovoda [One dangerous phenomenon accompanying gas outflow from the pipeline].Gazovaya promyshlennost', 2008, no. 1, pp. 82–83.

2. Lurye, M.V. Matematicheskoe modelirovanie protsessov truboprovodnogo transporta nefti, nefteproduktov i gaza [Mathematical modeling of pipeline transportation of oil, netroleum products and gas]. Moscow, Izdatel'skiy tsentr RGU nefti i gaza im. I.M. Gubkina, 2012. 456 p.

3. Kutsova, E.V., Serdyukov, S.G., Vasilyev, E.M. Matematicheskoe modelirovanie avariynykh rezhimov magistral'nykh gazoprovodov [Mathematical modeling of emergency regimes of cross-country gas pipelines]. Vestnik Voronezhskogo gosudarstvennogo tekhnicheskogo universiteta, 2011, vol. 7, no. 9, pp. 17–21.

4. Lurye, M.V. Ekspertiza utechek gaza iz rezervuarov s vysokim davleniem [Expert review of gas escape from high-pressure reservoirs]. Territoriya neftegaz, 2014,no. 4, pp. 52–57.

5. Lurye, M.V., Naydenov, R.A. Utochnennyy raschet utechek gaza cherez otverstiya v stenkakh gazoprovodov vysokogo davleniya [Refined calculation of gas escape through holes in walls of high-pressure gas pipelines]. Gazovaya promyshlennost', 2014, no. 8(710), pp. 82–85.

6. Yelin, N.N., Bardin, A.V., Zaginayko, D.V., Popov, A.P. Programmnyy kompleks OISPipe dlya monitoringa i optimizatsii sistem sbora gaza mestorozhdeniy razlichnykh tipov [Software package OISPipe for monitoring and optimizing gas collection systems of different gas fields]. Neftyanoe khozyaystvo, 2008, no. 5, pp. 65–69.

7. Yelin, N.N., Nassonov, Yu.V., Belousov, O.V. Programmnyy kompleks OIS PIPE dlya matematicheskogo modelirovaniya slozhnykh truboprovodnykh sistem promyslovogo obustroystva [Software package OISPipe for mathematical modelling of complex pipeline systems of industrial facilities]. Neftyanoe khozyaystvo, 2002, no. 12, pp. 91–93.

8. Yelin, N.N., Popov, A.P., Zaginaiko, D.V., Korolev, M.G. Modelirovanie i optimizatsiya setey s periodicheski rabotayushchimi istochnikami [Modelling and optimization of networks with periodically working sources]. Vestnik IGEU, 2016, issue 3, pp. 73–77.

9. Kirillin, V.A., Sychev, V.V., Sheindlin, A.E. Tekhnicheskaya termodinamika [Technical thermodynamics]. Moscow, Energoatomizdat, 1983. 512 p.

10. Rid, R., Prausnits, Dzh., Shervud, T. Svoystva gazov i zhidkostey [Properties of gases and liquids]. Leningrad, Khimiya, 1982. 592 p.

11. Brill, J.P., Mukherjee, H. Multiphase flowin wells. Henry L. Doherty Fund of AIME Society of Petroleum Engineers Inc. Richardson. Texas, 1999. 157 p.

Ключевые слова на русском языке: 
аварийный режим, динамика истечения газа, массовый расход, процесс опорожнения, локализация порыва, давление газа, гидравлические потери
Ключевые слова на английском языке: 
emergency regime, gas outflow dynamics, mass flow rate, discharge process, breakage localization, gas pressure, hydraulic losses
The DOI index: 
10.17588/2072-2672.2017.1.062-068
Downloads count: 
16