scholarly journals Development of Domestic Gas Supply and Utilisation Prices for Effective Gas Distribution in Nigeria

Author(s):  
Kenneth Nduka ◽  
Ubanozie Julian Obibuike ◽  
Ifeanyi Michael Onyejekwe ◽  
Anthony Kerunwa ◽  
Stanley Toochukwu Ekwueme
Keyword(s):  
Author(s):  
Heng Zhou ◽  
Shuyu Wang ◽  
Binbin Du ◽  
Mingyin Kou ◽  
Zhiyong Tang ◽  
...  

AbstractIn order to develop the central gas flow in COREX shaft furnace, a new installment of center gas supply device (CGD) is designed. In this work, a coupled DEM–CFD model was employed to study the influence of CGD on gas–solid flow in COREX shaft furnace. The particle descending velocity, particle segregation behaviour, void distribution and gas distribution were investigated. The results show that the CGD affects the particles descending velocity remarkably as the burden falling down to the slot. Particle segregation can be observed under the inverse ‘V’ burden profile, and the influence of CGD on the particle segregation is unobvious on the whole, which causes the result that the voidage is slightly changed. Although the effect of CGD on solid flow is not significant, the gas flow in shaft furnace has an obvious change. Compared with the condition without CGD, in the case with CGD, the gas velocity is improved significantly, especially in the middle zone of the furnace, which further promotes the center gas distribution. Meanwhile, the pressure drop in the furnace with the installation of CGD is increased partly.


2010 ◽  
Vol 2010 ◽  
pp. 1-23 ◽  
Author(s):  
Vadim E. Seleznev

The paper describes a new method for numerical monitoring of discrepancies in natural gas supply to consumers, who receive gas from gas distribution loops. This method serves to resolve the vital problem of commercial natural gas accounting under the conditions of deficient field measurements of gas supply volumes. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Such estimation is performed using a computational fluid dynamics simulator of gas flows in the gas distribution system of interest. Numerical monitoring of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.


2017 ◽  
Vol 21 (3) ◽  
pp. 68-74
Author(s):  
V. S. Ezhov ◽  
G. G. Shchedrina ◽  
N. E. Semicheva

The existing methods for natural gas dehydration both in fields and at compressor stations cannot always provide standatdized values of natural gas dehydration. The analysis of operation of gas distribution systems shows that dehydration units are improperly placed and are often installed out of condensation and freezing zones. This is due to the lack of consideration of phase transitions impact in gas throttling on its temperature condition. Due to insufficient natural gas dehydration, crystalline hydrates can be formed on wellbores, distribution lines and main gas pipelines and at its reduction, disturbing the operation of the equipment of compressor stations, gas distribution stations, deranging instrumentation and automation. The issues of reliability of gas pipeline systems considering the formation of crystalline hydrate plugs in pipelines have been studied. The analysis of the methods and devices preventing hydrates formation and eliminating existing crystalline hydrate plugs has shown that to provide normalized parameters of the transported gas it is necessary to perform additional water vapor, condensate drops and crystalline hydrate particles removal from natural gas at gas distribution stations during winter months. Currently applied methods used to deal with crystalline hydrate plugs in main gas pipelines require significant expenses and do not effectively ensure the reliability of pipelines operation. An energy-efficient design of an integrated treatment unit which provides an additional natural gas treatment at GDS, increases the reliability of gas pipelines protection against hydrate blockage and improves the efficiency of gas supply systems as a whole have been proposed at the Department of Heat and Gas Supply and Ventilation of the SWSU.


2018 ◽  
Vol 170 ◽  
pp. 03016 ◽  
Author(s):  
Viktor Zhila ◽  
Elena Solovyeva

The main source of energy in the economy is gas fuel. The specific weight of natural gas in the fuel and energy balance is about 50%. †The main requirement for the gas distribution system is to ensure the reliability, safety of this system. One of the ways to improve the reliability of gas supply systems is to use the reliability of automatic equipment to determine the gas contamination of premises. Based on the analysis of calculation formulas, an algorithm for the hydraulic calculation of gas pipelines is compiled. Based on the characteristics of gas distribution systems, it is advisable to apply such a solution, when gas supply of domestic consumers, boiler houses of municipal agricultural enterprises is carried out from the distribution network of high and medium pressure through autonomous combined pressure regulators installed in areas of high-rise buildings.


2019 ◽  
Vol 91 ◽  
pp. 07016
Author(s):  
Elena Solovyeva

This article analyzes the causes of accidents on overhead gas pipelines. Special attention is paid to the operating conditions of gas distribution and gas consumption systems. The main measures aimed at reducing the environmental danger of gas supply systems operation have been identified. The main methods of increasing the reliability of gas distribution systems in the design of gas networks are considered. The complex index of reliability of gas distribution systems is used, which allows choosing the optimal version of the gas supply system.


2018 ◽  
Vol 251 ◽  
pp. 03031
Author(s):  
Aleksey Klochko ◽  
Asmik Klochko

The article considers the issues of obtaining a network configuration by the criterion of maximizing the reliability index. The rationally designed configuration of the gas distribution network for the selected gas supply scheme ensures reliable operation throughout the life of gas pipeline. The results are recommended in designing of gas distribution networks, as well as when determining the reserve for improving the reliability of the network for the adopted gas supply scheme for subscribers.


2018 ◽  
Vol 769 ◽  
pp. 383-387
Author(s):  
Oksana Medvedeva ◽  
Gleb Fominykh

Liquefied natural gas (LNG) is rather competitive and can act as an alternative fuel. Zone determination for economically expedient use of this energy resource is a necessary prerequisite for solving an important task - providing consumers with gas fuel. Development of scientific bases of calculation and design of autonomous gas supply systems on the basis of liquefied natural gas is an urgent scientific and technical task that takes into account the variability of the determining factors and characteristics of the modern gas supply systems. This requires a comprehensive solution of a number of problems, the main ones are a method for the optimal functioning of the autonomous gas supply systems; development of a method for determining the optimal location of the LNG plant ; development of methods of calculation of key parameters of natural gas in the transportation scheme and the use of LNG; technical-economic substantiation of expediency of application of the developed technical solutions in the field of autonomous gas supply, remote from the gas network. The article presents the results of technical and economic studies of gas distribution systems based on liquefied natural gas, proposed a numerical algorithm and its computer implementation to determine the location of the plant for liquefying gas. Conducted calculations and comparative analysis show that LNG-based gas supply systems will provide fuel for consumers located at considerable distance from the source of gas supply (main gas pipeline or gas distribution station).


2018 ◽  
Vol 251 ◽  
pp. 03030
Author(s):  
Aleksey Klochko ◽  
Viktor Zhila

The article examines the issues of determining the network configuration, which ensures the maximum reliability of the gas distribution system. Rationally designed configuration of the gas distribution network with the adopted gas supply scheme can provide reliable operation for a long time. Results are recommended to be used in the design of gas distribution networks, as well as in determining the reserve for improving the reliability of the network for the adopted gas supply scheme for users.


2021 ◽  
Vol 2021 (1) ◽  
pp. 25-37
Author(s):  
Roman Yukhymets ◽  
◽  

The article considers the main reasons that have led to the debt crisis in the natural gas market of Ukraine due to the accumulation of debt from gas supply and gas distribution companies. The purpose of the study is to identify the main prerequisites for the formation of debt in different segments du-ring the reform of the natural gas market through partial implementation of the requirements of European energy legislation. Having chosen the European vector of development Ukraine is interested in meeting the requirements of European policy within the framework of its international obligations and aspirations for European integration. This necessitates adaptation of the national institutional environment to the basic requirements of the Second and Third energy packages. According to the existing international obligations, the national natural gas market is undergoing significant changes towards liberalization and development of competitive environment. However, in the segment of retail market and supply of natural gas to household consumers for a long time the necessary changes in the institutional environment did not occur or temporary decisions were made, which did not contribute to solving the sector’s crisis, but only froze the existing model of relationships between various market participants. Reluctance to implement unpopular solutions in the supply of natural gas to household consumers and attempts to shift the increase in the cost of gas supply tariffs for the needs of the household consumers to other categories of consumers led to a constant redistribution of monopolistic influence and accumulation of significant debt between market participants. The article analyzes the causes of debt between various participants in the retail segment of the natural gas market, which makes it possible to identify the main factors of such debt. These factors include: the lack of a sufficient level of transparency in the tariff for natural gas supply and transportation services; the absence of a 100% accounting for various categories of consumers, which makes it necessary to establish consumption standards, which later become the object of significant abuse; the existing model of public service obligations, which, given the significant redistribution of natural gas, results in significant market distortions; and the imperfect approach to calculating the costs of gas distribution companies in terms of temperature coefficients in the tariff, provided that gas metering exists not in energy units, but in cubic meters. Based on the results obtained in the article, the author sets forwards various recommendations for the implementation of measures, whose main content is to eliminate the institutional prerequisites that lead to the risks of market failures, which may cause debt.


2019 ◽  
Vol 158 ◽  
pp. 2290-2298 ◽  
Author(s):  
Huicui Chen ◽  
Xin Zhao ◽  
Bingwang Qu ◽  
Tong Zhang ◽  
Pucheng Pei

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