scholarly journals The concept of reliability-oriented accounting of leaks in gas supply systems

2019 ◽  
Vol 97 ◽  
pp. 03021 ◽  
Author(s):  
Olga Gnezhdilova ◽  
Anna Malysheva ◽  
Anna Gagulina ◽  
Aleksandr Ovsienko
Keyword(s):  
Systems Engineering ◽  
Gas Flow ◽  
Distribution Networks ◽  
Measuring Error ◽  
Analytical Review ◽  
Individual Household ◽  
Method Of Evaluation ◽  
Gas Leaks ◽  
Supply Systems ◽  
Gas Supply

The concept of reliability-oriented maintenance of gas distribution networks is substantiated. Performed an analytical review of works of leading scientists in the field of the theory of gas supply of individual household. It has been established that the question of control and to prevent gas leaks remains relevant now. It is proved, that for engineering systems use gas for domestic purposes, also the greatest risk are low-intensity gas leaks, that hardly controlled by hardware due to accounting errors. An algorithm is presented for vulnerability assessment elements engineering gas supply systems for leaks. The mathematical model for the evaluation of measuring error of parametric parameter of gas flow in the system. The technique for monitoring the tightness of gas systems engineering with the rationale for selecting the method of evaluation of error results.

scholarly journals Transformation of a mathematical model of gas flow distribution to solve the problems of gas supply system development

2020 ◽  
Vol 219 ◽  
pp. 02001
Author(s):  
Nikolay Ilkevich ◽  
Tatyana Dzyubina ◽  
Zhanna Kalinina
Keyword(s):  
Mathematical Model ◽  
Gas Flow ◽  
System Development ◽  
Flow Distribution ◽  
Supply System ◽  
Economic Environment ◽  
Gas Flows ◽  
Supply Systems ◽  
New Criteria ◽  
Gas Supply

This paper proposes taking into account new properties of gas supply systems in a mathematical model of flow distribution in comparison with the traditional formulation. The approach suggests introducing an arc coefficient, which allows for changes in the magnitude of gas flow passing along the arc, a vector of an increase in the arc throughput, and lower constraints on the gas flow along the arc. We also propose considering a new economic environment, namely, new criteria for optimizing the flow distribution and setting fictitious gas prices for consumers. These criteria enable us to take account of the priority gas supply to a definite group of consumers. As an example, the calculation of gas flows for the aggregated Unified Gas Supply System (UGSS) for 2030 is considered. This calculation takes into account the arc coefficients and the increase in the throughput of arcs.

DEVELOPMENT OF DIAGNOSTIC ALGORITHM LEAKS WITHOUT INTERFERENCE FROM STOCHASTIC CONSUMPTION IN THE GAS SUPPLY SYSTEM

10.12737/7819 ◽  
2015 ◽  
Vol 7 (4) ◽  
pp. 16-20
Author(s):  
Сазонова ◽  
Svetlana Sazonova ◽  
Акамсина ◽  
N. Akamsina ◽  
Курипта ◽  
...  
Keyword(s):  
Information Systems ◽  
Natural Gas ◽  
A Priori ◽  
Diagnostic Algorithm ◽  
Supply System ◽  
Technical Diagnostics ◽  
A Priori Uncertainty ◽  
Gas Leaks ◽  
Supply Systems ◽  
Gas Supply

The article considers the problem of detecting a single formalization of natural gas leaks in the system. The paper is devoted to the statistical synthesis with a priori uncertainty and adaptation of information systems technical diagnostics of gas supply systems.

scholarly journals Regional Gas Supply System Considered from the Standpoint of System Analysis and Regularities of its Functioning

2018 ◽  
Vol 61 (4) ◽  
pp. 359-371
Author(s):  
D. R. Mоroz ◽  
N. V. Hruntovich
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
System Analysis ◽  
Heating System ◽  
Supply System ◽  
Gas Flow Rate ◽  
Gas Consumption ◽  
Balance Structure ◽  
Supply Systems ◽  
Gas Supply

Investigation of the structure and the functional patterns of the regional gas supply systems is necessary for addressing a number of operational tasks, the main ones being the following: preparing requisitions for the planned volume of gas deliveries, project design for development and reconstruction of gas supply systems and gas storage facilities, developing of functional gas tariffs for different groups of customers. The regional gas supply system is considered from the standpoint of system analysis and presented as a complex dynamic system consisting of several subsystems. The balance structure of gas consumption in the region for the ten-year period and the patterns of daily gas consumption in the region depending on the average daily outdoor temperature for the two-year period have been studied. It is discovered that the power economy, industry and agriculture account for the largest share in the total gas consumption. The values of correlation coefficients between the outdoor air temperature and gas flow rate according to the elements of the balance structure are calculated. For the daily values of gas consumption for the needs of the population and housing-and-communal services, the highest correlation coefficient between the studied characteristics R is noted = (–0,98‒(–0,96)). Analysis of the matching fields of daily gas consumption in the region to the daily average temperature over a given one-year timeframe made it possible to identified two key areas, viz.: the area of operation of the heating system and the area of positive temperatures (the cheating system is off). For each of the areas, the dependences of the daily gas flow rate on the temperature and the effect of temperature changes on the gas consumption alteration were determined. It was found out that the temperature range from 0 to 10 °C corresponds to the zone of uncertain state of the regional gas supply system, since two areas overlap in this zone, viz.: the area of operation of the heating system and the area of positive temperatures.

scholarly journals OPTIMIZATION OF DIFFERENTIAL PRESSURE DISTRIBUTION BETWEEN GAS SUPPLY SYSTEM SECTIONS

2020 ◽  
Vol 22 (6) ◽  
pp. 141-153
Author(s):  
O. N. Medvedeva ◽  
N. S. Bessonova
Keyword(s):  
Pressure Distribution ◽  
Pressure Loss ◽  
Distribution Systems ◽  
Gas Flow ◽  
Unit Length ◽  
Supply System ◽  
Differential Pressure ◽  
Strategic Factors ◽  
Supply Systems ◽  
Gas Supply

The paper proposes the optimum distribution of the differential pressure between gas supply system sections and gas consumption, depending on the settlement planning and development. This provides a 10–15 % reduction in metal and material consumption of gas supply systems and a 4–5 % cost reduction. The hydraulic analysis of differential pressure distribution does not allow to purposefully distribute the calculated pressure drop. The pipeline diameter is usually selected according to the estimated gas flow rate and specific pressure loss per unit length of gas supply system sections. Then, in accordance with the State standard, the condition of compliance and non-exceedance of the obtained differential pressure is checked with the standard value. If this condition is not met, the pipeline diameter is adjusted for design reasons.This work conducts additional research into the differential pressure distribution between gas supply system sections. Materials and methods include the assessment methodology for the effectiveness of differential pressure distribution between gas supply system sections.Although many publications are devoted to the optimization of gas pressure distribution systems, the proposed solutions and the recommendations developed in this paper are fragmentary, often contradictory, since they do not consider the completeness and diversity of strategic factors.The paper shows that the pressure loss values obtained for domestic gas-based units with a reduced nominal pressure, are much less than those given in regulatory documents. According to the analysis, the settlement development, population density in gas-supplied territories, and technical conditions of gas-supplied buildings, have a decisive influence on the unit costs of gas supply systems.

scholarly journals Influence of center gas supply device on gas–solid flow in COREX shaft furnace through DEM–CFD model

2020 ◽  
Vol 18 (5-6) ◽  
Author(s):  
Heng Zhou ◽  
Shuyu Wang ◽  
Binbin Du ◽  
Mingyin Kou ◽  
Zhiyong Tang ◽  
...  
Keyword(s):  
Gas Flow ◽  
Shaft Furnace ◽  
Middle Zone ◽  
Cfd Model ◽  
Gas Velocity ◽  
Gas Distribution ◽  
Particle Segregation ◽  
Solid Flow ◽  
Corex Shaft Furnace ◽  
Gas Supply

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.

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