Optimization of city gas network: a case study from Gujarat, India

The concept of disaster resilience has received considerable attention in recent years and it is increasingly used as an approach for understanding the dynamics of natural disaster systems. No models are available in literature to measure the performance of natural gas network, therefore, in this paper, a new performance index measuring functionality of gas distribution network have been proposed to evaluate the resilience index of the entire network. It can be used for any type of natural or manmade hazard which might lead to the disruption of the system. The gas distribution network of the municipalities of Introdacqua and Sulmona, two small towns in the center of Italy which were affected by 2009 earthquake have been used as case study. Together the pipeline network covers an area of 136 km2, with 3 M/R stations and 16 regulation groups. The software SynerGEE has been used to simulate different scenario events. The numerical results showed that, during emergency, to ensure an acceptable delivery service, it is crucial to guarantee the functionality of the medium pressure gas distribution network. Instead to improve resilience of the entire network the best retrofit strategy is to include emergency shutoff valves along the pipes.

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Investigation of the Multi-Point Injection of Green Hydrogen from Curtailed Renewable Power into a Gas Network

Energies ◽

10.3390/en13226047 ◽

2020 ◽

Vol 13 (22) ◽

pp. 6047 ◽

Cited By ~ 1

Author(s):

Ali Ekhtiari ◽

Damian Flynn ◽

Eoin Syron

Keyword(s):

Green Energy ◽

Active Management ◽

Electricity Production ◽

Renewable Electricity ◽

Gas Network ◽

Network Location ◽

Network Parameters ◽

Renewable Power ◽

The Impact

Renewable electricity can be converted into hydrogen via electrolysis also known as power-to-H2 (P2H), which, when injected in the gas network pipelines provides a potential solution for the storage and transport of this green energy. Because of the variable renewable electricity production, the electricity end-user’s demand for “power when required”, distribution, and transmission power grid constrains the availability of renewable energy for P2H can be difficult to predict. The evaluation of any potential P2H investment while taking into account this consideration, should also examine the effects of incorporating the produced green hydrogen in the gas network. Parameters, including pipeline pressure drop, flowrate, velocity, and, most importantly, composition and calorific content, are crucial for gas network management. A simplified representation of the Irish gas transmission network is created and used as a case study to investigate the impact on gas network operation, of hydrogen generated from curtailed wind power. The variability in wind speed and gas network demands that occur over a 24 h period and with network location are all incorporated into a case study to determine how the inclusion of green hydrogen will affect gas network parameters. This work demonstrates that when using only curtailed renewable electricity during a period with excess renewable power generation, despite using multiple injection points, significant variation in gas quality can occur in the gas network. Hydrogen concentrations of up to 15.8% occur, which exceed the recommended permitted limits for the blending of hydrogen in a natural gas network. These results highlight the importance of modelling both the gas and electricity systems when investigating any potential P2H installation. It is concluded that, for gas networks that decarbonise through the inclusion of blended hydrogen, active management of gas quality is required for all but the smallest of installations.

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An integrated approach to energy use: the case study of the ACEA site

E3S Web of Conferences ◽

10.1051/e3sconf/201911900023 ◽

2019 ◽

Vol 119 ◽

pp. 00023

Author(s):

Viviana Negro ◽

Davide Mainero

Keyword(s):

Energy Recovery ◽

Energy Use ◽

Electric Energy ◽

Integrated Approach ◽

Combined Heat And Power ◽

Organic Fraction ◽

Horizon 2020 ◽

Gas Network ◽

Purification System

Currently, ACEA utilises biogas obtained from the treatment of the organic fraction of municipal solid waste for thermal and electric energy recovery through endothermic engines (3 MW, in total). By 2020, the biogas produced at the site will no longer be used as a fuel for the combined heat and power units, but it is expected to feed a purification system in order to obtain a flow of biomethane to be injected into the natural gas network. This is part of the Italian strategy to achieve the Horizon 2020 European targets aimed at promoting the renewable production of transport fuels. In order to encourage sustainability and innovative prototype technologies, ACEA has also been involved in some European research projects, in particular for the conversion of biogas into other energy carriers. furthermore, ACEA ha recently built a flexible experimental platform that can used for the validation step of prototypes in an industrial field.

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The Research on Leak Detection System of City Gas Network

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.353-356.3067 ◽

2013 ◽

Vol 353-356 ◽

pp. 3067-3071

Author(s):

Jiao Na Jiao ◽

Jian Jun Yu

Keyword(s):

Experimental Research ◽

Detection System ◽

Reference Value ◽

Leak Detection ◽

Detection Task ◽

Leakage Detection ◽

Gas Network ◽

Daily Monitoring ◽

Detection Systems ◽

City Gas

Researches on leak detection system of gas network are significant to fault pipelines diagnosis. In the daily operation of city gas pipeline network, pipeline leakage is the most risky failure type. This paper attempts to review and analyze the existing gas network leak detection systems, meanwhile, design a new kind of leak detection system for daily monitoring and leakage detection of gas network. The greatest advantage of this system is to be able to do all kinds of leak experimental research, especially has great reference value for the leak detection task in colleges and universities.

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Development of Large-Scale City-Gas Network Alert System Based on Monitored Earthquake Ground Motion.

Doboku Gakkai Ronbunshu ◽

10.2208/jscej.1995.525_331 ◽

1995 ◽

pp. 331-340 ◽

Cited By ~ 6

Author(s):

Fumio Yamazaki ◽

Tsuneo Katayama ◽

Shigeru Noda ◽

Yoichi Yoshikawa ◽

Yasuaki Otani

Keyword(s):

Ground Motion ◽

Large Scale ◽

Earthquake Ground Motion ◽

Alert System ◽

Gas Network ◽

City Gas

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Fuel Gas Network Synthesis Using Block Superstructure

10.20944/preprints201802.0025.v1 ◽

2018 ◽

Author(s):

Jianping Li ◽

Salih Emre Demirel ◽

M. M. Faruque Hasan

Keyword(s):

Process Design ◽

Real Life ◽

Mixed Integer ◽

Network Synthesis ◽

Systematic Method ◽

Fuel Gas ◽

Gas Network ◽

Classical Source ◽

Minlp Problem

Fuel gas network (FGN) synthesis is a systematic method for reducing fresh fuel consumption in a chemical plant. In this work, we address the synthesis of fuel gas network using block superstructure originally proposed for process design and intensification (Demirel et.al. [1]). Instead of a classical source-pool-sink superstructure, we consider a superstructure with multiple feed and product streams. These blocks interact with each other through direct flows that connect a block with its adjacent blocks and through jump flows that connect a block with all blocks. The blocks with feed streams are viewed as fuel sources and the blocks with product streams are regarded as fuel sinks. Addition blocks can be added as pools when there exists intermediate operations among 9 source blocks and sink blocks. These blocks can be arranged in a I × J two-dimensional grid with I = 1 for problems without pools, or I = 2 for problems with pools. J is determined by the maximum number of pools/sinks. With this representation, we formulate fuel gas network synthesis problem as a mixed-integer nonlinear (MINLP) problem to optimally design a fuel gas network with minimal total annul cost. We present a real-life case study from LNG plant to demonstrate the capability of the proposed approach.

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