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 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.

scholarly journals Environmental safety of the gas distribution system

2019 ◽  
Vol 91 ◽  
pp. 07016
Author(s):  
Elena Solovyeva
Keyword(s):  
Distribution System ◽  
Distribution Systems ◽  
Environmental Safety ◽  
Supply System ◽  
Operating Conditions ◽  
Gas Distribution ◽  
Complex Index ◽  
Gas Consumption ◽  
Supply Systems ◽  
Gas Supply

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.

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 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 Economic and mathematical model of selecting a gas supply system based on biomethane and natural gas

Vestnik MGSU ◽  
2021 ◽  
pp. 1388-1396
Author(s):  
Denis Yu. Suslov
Keyword(s):  
Mathematical Model ◽  
Natural Gas ◽  
Alternative Energy ◽  
Critical Length ◽  
Supply System ◽  
Gas Pipeline ◽  
Rational Use ◽  
Reduced Costs ◽  
Supply Systems ◽  
Gas Supply

Introduction. A promising direction in the development of gas supply systems, which is widely used in the developed countries of the world, is the use of an alternative energy source — biomethane. The effective use of biomethane requires the development of scientific provisions and recommendations for the use of biomethane gas supply systems, taking into account technical and economic factors. Therefore, it is urgent to develop an economic and mathematical model for choosing a gasification method and determining the area of rational use of gas supply systems with biomethane. Materials and methods. To develop an economic and mathematical model for choosing a method for gasification of settlements, methods of mathematical modeling and parametric optimization were used. The implementation of the economic and mathematical model was carried out in the Mathcad software package. Mathematical and graphic processing of the results obtained was carried out. Results. An economic and mathematical model was developed for determining the rational area of application of biome­thane for gas supply to settlements. The model is based on the technical and economic calculation of the reduced costs for gas supply systems with network natural gas and biomethane. Using the developed model, the technical parameters of the biomethane gas supply system were determined: the critical length of the gas pipeline branch, the radius of the biomethane plant, the biomethane consumption, the length of the gas pipeline for the biomethane supply, and the reduced costs to the gas supply system. A graph of the dependence of the critical length of the gas pipeline branch on the population size has been obtained, which makes it possible to determine the area of rational use of biomethane for gas supply to settlements. It was found that for a rural settlement with a population of 5,000 people, the critical length of the gas pipeline branch is 24.820–28.044 km, for an urban-type settlement with a population of 15,000 people, the length of the gas pipeline branch is 50.923–64.677 km, and for a city with a population of 30,000 people — 89.617–127.279 km. Conclusions. The results obtained can be used for the development and design of gas supply systems based on biomethane for the gasification of settlements remote from the main gas pipelines. The use of biomethane makes it possible to gasify settlements in developed agricultural regions and to increase the efficiency of the gas transportation system of the Russian Federation.

scholarly journals THEORETICAL SUBSTANTIATION OF THE USE OF BIOMETHANE IN GAS SUPPLY SYSTEMS

2021 ◽  
Vol 6 (11) ◽  
pp. 49-57
Author(s):  
D. Suslov
Keyword(s):  
Alternative Energy ◽  
Supply System ◽  
Operating Conditions ◽  
Technological Parameters ◽  
Gas Network ◽  
Theoretical Substantiation ◽  
Gas Consumption ◽  
Effective Use ◽  
Supply Systems ◽  
Gas Supply

The work is devoted to the urgent problem of using an alternative energy source of biomethane for gas supply to settlements. The effective use of biomethane in gas supply systems requires scientific substantiation, considering the entire range of technological parameters and operating conditions. The methods of graphs and parametric optimization are used to minimize the total reduced costs to the gas supply system to carry out the research. Based on the analysis of gas consumption by the municipal districts of the Belgorod region, a graphical dependence is built and an expression is obtained to determine the annual gas consumption by the population on the population size. The calculation of the mass of organic waste and the density of substrate formation is made, on the basis of which the potential for biomethane production in the municipal districts of the Belgorod region is determined. It has been established that the potential volume of biomethane in the Belgorod region is 633194 thousand m3 / year, or 11% of the total gas consumption. A diagram of the location of biomethane plants and gas pipelines for supplying biomethane to gas networks has been built. The optimal values of the technological parameters of the biomethane gas supply system have been established: the operating range of the biomethane plant depending on the substrate formation density, the length of the gas network for biomethane supply, depending on the gas consumption density.

scholarly journals ON THE QUESTION OF THE EFFECTIVENESS OF NETWORK TECHNOLOGIES IN AUTOMATED GAS SUPPLY SYSTEMS

2021 ◽  
Vol 1 (161) ◽  
pp. 267-273
Author(s):  
Yu. Pakhomov ◽  
N. Shulga ◽  
L. Piddubna
Keyword(s):  
Local Control ◽  
Data Transmission ◽  
Digital Control ◽  
Control Device ◽  
Supply System ◽  
Automated System ◽  
Main Element ◽  
Control And Management ◽  
Supply Systems ◽  
Gas Supply

The topical issues of development of automated control systems of gas control stations (GCS) and ways of reliable and economical functioning of the gas supply system in modern conditions have been considered in the article. The implementation of European innovative technologies, which are associated with using the modern equipment, telemetry tools to transmit the equipment operation parameters to the dispatcher control panel are the one of the ways to increase the safety and efficiency of GCS performance. The characteristic of the modern complex of telemetry, the raising of efficiency, reliability and safe operation of the gas supply systems due to the possibility of monitoring, technological control and management from the central dispatcher control room are given. The complex of telemetry helps to prevent emergency situations at facilities and to ensure control over unauthorized entry into the GCS premises by unauthorized persons. The article discusses the use of the automated system of operative-dispatching management (ASODM). It is a multi-level automated system that ensures the reliable functioning of the gas supply system at all levels of the hierarchy. It has been shown that the result of the creation of the ASODM are equipping of the control object with microprocessor control and management devices, the integration of various automation tools into a single information management system. It has been proven that the development of ASODM of GCS on the basis of local control and management modules using traditional approaches to creation of automation systems and using the cellular telephone communication as data transmission channels based on GSM-technologies are most rational. The digital control device, which is made on the technological platform of the programmable logic integrated circuit (PLIC), is the main element of the local control and management module. Digital control device (PLIC controller) is a relatively inexpensive and reliable equipment in an automated local GCS control system. The method of data transmission via GSM / GPRS wireless communication channel is considered. The use of GSM-modems and GPRS technology allows to remove restrictions on the distance of data transmission, as well as allows to fully automate the process of transmission and processing of information. The use of GSM / GPRS-technologies in the vehicles of the emergency dispatch service is also shown. The dispatcher can fully monitor the movement of the car with registration on the map of the city where the car is located.

scholarly journals Hydraulic Calculation of Copper Pipelines for Heating and Internal Gas Supply Systems

2018 ◽  
Vol 17 (6) ◽  
pp. 508-514
Author(s):  
M. A. Rutkowski ◽  
A. S. Shybeka ◽  
K. I. Halynia
Keyword(s):  
Pressure Loss ◽  
Theoretical Calculations ◽  
Residential Buildings ◽  
Hydraulic Calculation ◽  
Design Standards ◽  
Heating Systems ◽  
Local Loss ◽  
Supply Systems ◽  
Gas Supply

Copper pipelines are widely used while designing modern heating systems, water and gas supply of residential buildings and these pipelines have a number of advantages in comparison with steel and plastic pipelines. The main reason for limited use of copper pipes is their cost which is practically twice as much as cost of steel pipes, and four times higher than the coat of polypropylene pipes. Modern design standards in Belarus do not contain specific requirements for calculation of copper pipelines. Therefore hydraulic calculation of heating systems has been considered and analyzed on the basis of norms of Russian Federation. The drawback of all theoretical calculations presented in Russian standards is their abstraction from general laws of fluid and gas mechanics. For this reason theoretical foundations of hydraulic calculations for all pipelines have been considered and expressions have been given for determination of pressure loss due to friction and in local loss. Main flow regimes have been considered on the basis of I. Nikuradze’s experiments in order to determine linear losses and dependences for determination of friction coefficient in laminar, transient and turbulent modes have been presented in the paper. Values of local loss coefficient for main pipeline elements are given for calculation of pressure loss and the paper also shows determination of value z with due account of equipment capacity. An analysis of nomograms presented in Russian norms and researches has been carried out; shortcomings have been revealed and the ways directed on their perfection have been found. Nomograms for calculation of specific pressure losses in heating systems and internal gas supply have been constructed on the basis of natural gas and propane with due account of dependences presented in the paper. Nomograms for finding equivalent length of a single local loss have been constructed for calculation of internal gas supply systems.

scholarly journals The study of structural fields of daily gas consumption of the balance groups of the regional gas supply system

2020 ◽  
Vol 178 ◽  
pp. 01066 ◽  
Author(s):  
Deniz Moroz ◽  
Nadzeya Hruntovich ◽  
Nikolay Hruntovich ◽  
Svetlana Jhukovets ◽  
Aleksey Kapansky ◽  
...  
Keyword(s):  
Gas Flow ◽  
Balance Sheet ◽  
Supply System ◽  
Outdoor Temperature ◽  
Gas Consumption ◽  
Conducting Research ◽  
Balance Structure ◽  
Quantitative Indicators ◽  
Information Database ◽  
Gas Supply

The study of the balance sheet structure of the regional gas supply system is necessary to solve a number of operational tasks. An information database has been created for conducting research. It includes information on daily gas consumption and the actual average daily outdoor temperature for a six-year period for more than 539 elements of the balance structure of the regional gas supply system. The most significant factors determining gas consumption were identified for 7 enlarged balance groups. It´s investigated the dynamics of factors in time. The article presents the types of daily fields “gas flow – average daily outdoor temperature” for enlarged groups of the balance structure of the regional gas supply system. Four temperature areas were identified and substantiated in the daily fields. The assessment of qualitative and quantitative indicators characterizing the temperature areas is presented in the article.

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