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Simulation Model for Pipeline Network System with Non-pipe Elements for Natural Gas Transmission

ABRAHAM, DEBEBE WOLDEYOHANNES (2010) Simulation Model for Pipeline Network System with Non-pipe Elements for Natural Gas Transmission. PhD thesis, Universiti Teknologi PETRONAS.

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Abstract

The ever growing demand for natural gas enhances the development of complex transmission pipeline network system (TPNS) which requires simulation procedures for design and operation of the network. TPNS simulation is usually performed in order to determine the nodal pressures, temperatures and flow variables under various configurations. These variables are essential for analyzing the performance of the TPNS. The addition of non-pipe elements like compressor stations, valves, regulators and others make TPNS simulation analysis more difficult. A new simulation model was developed based on performance characteristic of compressors and the principles of conservation of energy and mass of the system to analyze TPNS with non-pipe elements for various configurations. The TPNS simulation model analyzes single phase gas flow and two-phase gas-liquid flow. The simulation model also takes into account temperature variation and age of the pipes. The model was designed for the evaluation of the unknown pressure, flow and temperature variables for the given pipeline network. The two solution schemes developed were iterative successive substitution scheme for simple network configurations and a generalized solution scheme which adopt Newton-Raphson algorithm for complex network configurations. The generalized Newton-Raphson based TPNS simulation model was tested based on the three most commonly found network configurations, namely: gunbarrel, branched and looped pipeline. In all the tests conducted, the solutions to the unknown variables were obtained with a wide range of initial estimations. A maximum of ten iterations were required to get solutions to nodal pressure, flow and temperature variables with relative percentage errors of less than 10- 11. The results of TPNS simulation model were compared with Newton loop-node method based on looped pipeline network configurations and an exhaustive optimization technique based on gunbarrel pipeline network configuration. For both cases, the results indicate that the model is able to provide solutions similar to the compared models. In addition, the TPNS simulation model provides detail information for the compressor stations. This information is essential for evaluation of the performance of the system. The application of the TPNS simulation model for real pipeline network system was also conducted based on existing pipeline network system. Three modules of TPNS simulation model which included input parameter analysis, function evaluation and network evaluation module were evaluated using the data taken from the real system. Analyses of the performance of compressor for existing pipeline network system which included discharge pressure, compression ratio and power consumption were also conducted using the developed TPNS simulation model. The performance characteristics maps generated by the developed TPNS simulation model show the variation of discharge pressure, compression ratio, and power consumption with flow rate similar to the one available in the literatures. Based on the results from the simulation tests and validation of the model, it is noted that the developed TPNS simulation model could be used for performance analysis to assist in the design and operations of transmission pipeline network systems. viii

Item Type: Thesis (PhD)
Academic Subject : Academic Department - Mechanical Engineering - Materials - Engineering materials - Metals alloys - Morphology
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 02 Oct 2013 11:23
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/8058

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