scholarly journals The Effectiveness of Extended Schedules of Heating Regulation at CHP Plants with Decreasing Normative Design Temperature of the Supply Water

2021 ◽  
pp. 99-114
Author(s):  
Dmitri Suvorov ◽  
◽  
Natalya Tatarinova ◽  
Ekaterina Lyskova ◽  
◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Supply ◽  
Computational Study ◽  
Heat Supply System ◽  
Specific Reference ◽  
Study Results ◽  
Energy Efficiency Indicator ◽  
Heat Supply Systems ◽  
Supply Systems ◽  
Supply Water

The aim of the work is a computational study of the effectiveness of the extended schedules of heating regulation at steam turbine CHPPs with a decrease in the normative design temperature of the supply water. The study was carried out on adequate mathematical models of CHP tur-bines and heat supply systems, considering heat pipelines' actual diameters and lengths. The main energy efficiency indicator is the specific reference fuel consumption for electricity sup-ply, calculated under comparable conditions for the operating modes of turbine plants and the load of the heat supply system. The study took into account the electricity consumption for the drive of network pumps, standard heat losses in heating networks and the electricity generation for the heat consumption of CHPPs. The study results allowed for the first time to determine the integral indicators of the energy efficiency of work during the transition of CHPPs from the normative design ones to the temperature schedules reduced by the temperature of the supply water. At the same time, the calculations revealed the limitations on the parameters of the extended schedules of regulation when transitioning to reduced temperature schedules. The most important results of the work should also be attributed to the determination of the optimal schedules of the temperature of the supply water for different values of the district heating coef-ficient of the CHPP. The results obtained are essential for assessing the efficiency of the transi-tion of heat supply systems to reduced supply water's design temperatures when using modern heating regulation schedules.

Improvement of the methodology assessment of reliability heat supply systems at the facilities of main pipelines

2021 ◽  
pp. 198-202
Author(s):  
Марина Николаевна Ильина ◽  
Дмитрий Васильевич Ларюшкин
Keyword(s):  
Cluster Analysis ◽  
Heat Supply ◽  
Network Reliability ◽  
Reliability Assessment ◽  
Heat Supply System ◽  
Operating Conditions ◽  
Heat Network ◽  
Heat Networks ◽  
Heat Supply Systems ◽  
Supply Systems

Источником информации о техническом состоянии трубопроводов тепловых сетей объектов магистральных нефтепроводов ПАО «Транснефть» являются результаты их обслуживания и ремонта, технического освидетельствования, гидравлических испытаний и т. д. На основании этих данных проводятся расчеты показателей надежности, по итогам анализа которых осуществляется планирование дальнейшего технического обслуживания и ремонта. Однако при оценке надежности систем теплоснабжения необходимо учитывать не только срок эксплуатации и величину амортизационного износа, но и реальное состояние в конкретных условиях функционирования. Учесть многообразие факторов, которые влияют на работоспособность трубопроводов системы теплоснабжения, и тем самым повысить точность расчетов при оценке их остаточного ресурса позволяет применение кластерного анализа в дополнение к используемой методике оценки надежности тепловых сетей. В рамках настоящей работы оценка надежности объектов АО «Связьтранснефть» с применением кластерного анализа проведена на примере равнозначных участков тепловых сетей двух узлов связи, расположенных в Краснодарском крае и Республике Саха (Якутия). Currently, information about technical condition of pipelines of heat supply systems at the facilities of the main oil pipelines of PJSC Transneft is formed based on the results of maintenance and repair, technical inspection, hydraulic tests, etc. Upon these data, calculations of reliability indicators of heat networks are carried out, based on the analysis of calculations further maintenance and repairs are planned. However, when assessing the reliability of heat supply systems, it is necessary to take into account not only the service life and the amount of depreciation wear of heat network elements, but also their real state in specific operating conditions. The use of cluster analysis in addition to the currently used method of heat network reliability assessment allows us to take into account the variety of factors that affect the operability of pipelines of the heat supply system, and thereby increase the accuracy of calculations when assessing their residual resource. Within the framework of this work, the reliability assessment of Svyaztransneft JSC facilities using cluster analysis was carried out on the example of equivalent sections of heat networks of two communication nodes located in the Krasnodar Territory and the Republic of Sakha (Yakutia).

scholarly journals Efficiency of systems of heat supply with introduction of automated individual heating substations

2019 ◽  
Vol 124 ◽  
pp. 01026
Author(s):  
Yu. N. Zvonareva ◽  
Sh. G. Ziganshin ◽  
E. V. Izmaylova ◽  
A. S. Gavrilov ◽  
A. V. Moryashev ◽  
...  
Keyword(s):  
Performance Indicators ◽  
System Performance ◽  
Heat Supply ◽  
Heat Supply System ◽  
Supply System ◽  
Research Results ◽  
Heat Supply Systems ◽  
Supply Systems

Article is devoted to increasing efficiency of heat supply systems. We demonstrate research results and an analysis of dependences of overall heat supply system performance indicators at various levels of equipment of consumers with the automated individual heating substations.

scholarly journals Improving the efficiency of heat release regulation in centralized heat supply systems

2020 ◽  
pp. 81-97
Author(s):  
O Shelimanova ◽  
◽  
A. Kolienko ◽  
Keyword(s):  
Energy Source ◽  
Energy Efficiency ◽  
Control Systems ◽  
Heat Supply ◽  
Heat Dissipation ◽  
District Heating ◽  
Heating Systems ◽  
District Heating Systems ◽  
Heat Supply Systems ◽  
Supply Systems

Ensuring optimal hydraulic and thermal regimes in district heating systems (DHS) in the regulation of heat supply is an important factor in improving the energy and economic efficiency of DHS. In addition, high efficiency of the HS system is a factor that can ensure the preservation of its vital functions. Solving the problem of increasing the energy efficiency of the heat supply system is a complex problem that requires changes at all stages of heat transformation: in the energy source, heating networks and subscriber heating systems of heat consumers. The purpose of this study is to identify the impact of heat dissipation control processes in district heating systems on their energy and economic efficiency, provide recommendations for improving control processes taking into account modern challenges and regulatory requirements, analyze heat dissipation temperature schedules and select the optimal temperature schedule. It is shown that the optimal is the combined quantitative and qualitative regulation of heat release, which should be carried out both at the energy source and at consumers. The paper considers the possibility of using combined control systems in the existing district heating systems of Ukrainian cities. It is shown that the achievement of high energy efficiency is possible only with the introduction of automatic individual heating points with weather control and pressure drop regulators at the inlet to the buildings in the subscriber heating systems. Calculations of the amount of heat consumption reduction of centralized heat supply systems with the introduction of optimal control systems are performed.

IMPROVE THE ENERGY EFFICIENCY OF HEAT SUPPLY SYSTEMS IN EDUCATIONAL INSTITUTIONS

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
І. Радько ◽  
◽  
В. Наливайко ◽  
О. Окушко ◽  
◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Supply ◽  
Educational Institutions ◽  
Heat Supply Systems ◽  
Supply Systems

scholarly journals ABOUT THE ALIGNMENT DESIGN OF HEAT SUPPLY SYSTEMS ON THE BASIS OF SYSTEM ANALYSIS

2020 ◽  
pp. 35-45
Author(s):  
A. V. Loboda ◽  
A. A. Chuikina
Keyword(s):  
Heat Supply ◽  
Optimization Problem ◽  
System Analysis ◽  
Heat Supply System ◽  
Supply System ◽  
Optimal Solutions ◽  
Mathematical Problems ◽  
Heat Supply Systems ◽  
Supply Systems ◽  
Weight Coefficients

Statement of the problem. The aim of the article is to develop procedures for translating practical questions about the choice of optimal routes of the heat supply system into mathematical problems of multi-criteria optimization and the study of these problems taking into account a large number of different parameters of the system and their connections.Results and conclusions. A mathematical description is compiled of the route choosing problem for the heat supply system based on the methods of system analysis. As optimized criteria, the integrated parameters are discussed describing the main characteristics of the systems under consideration. Unification of the problem where some of the criteria must be minimized and the other one maximized is carried out by replacing the minimized criteria with inverse values. Using the example of the modeling problems the procedures are shown for finding optimal solutions. The visibility of such procedures is provided by the use of a quadratic (Euclidean) norm instead of the traditional summation of weight coefficients. The importance of correct scaling and choice of weight factors is shown in the study of the discussed multi-criteria optimization problem.

scholarly journals Reconstruction of power systems of small cities and rural settlements

2020 ◽  
pp. 91-93
Author(s):  
Natalya Anatolyevna Kharlamova
Keyword(s):  
Power Systems ◽  
Heat Supply ◽  
Heat Supply System ◽  
Supply System ◽  
Investment Policy ◽  
Rural Settlements ◽  
Small Cities ◽  
Basic Principles ◽  
Heat Supply Systems ◽  
Supply Systems

The basic principles of developing measures for the reconstruction of elements that make up the heat supply system, including heat consumers, heat networks and heat supply sources, are considered. Some issues of organizing the reconstruction and modernization of heat supply systems for the purpose of energy saving and the specifics of investment policy are analyzed.

scholarly journals INCREASING THE RELIABILITY OF HEATING SYSTEMS

2020 ◽  
Vol 46 (4) ◽  
pp. 197-204
Author(s):  
R. A. Shershenov ◽  
A. Yu. Efimov ◽  
V. Yu. Shmakov
Keyword(s):  
Heat Supply ◽  
High Efficiency ◽  
Heat Supply System ◽  
Heating System ◽  
Supply System ◽  
The State ◽  
Additional Costs ◽  
Heat Supply Systems ◽  
Reliability Of Operation ◽  
Supply Systems

Objectives. The study was aimed at improving the reliability of heat supply systems. At present, this is one of the most relevant topics in the field of heat supply. The issue of reliability of heat supply is of great importance in terms of the safety of citizens and the state as a whole. Due to the severity of winter conditions and risk of hypothermia, heat supply security can be considered to be as critical as food security. Therefore, the reliability of heat supply systems becomes one of the most important aspects of the security of the state.Method. The study was carried out using the method of reservation of the heat supply system by looping.Result. In order to avoid the defrosting of the heat supply system and reduce additional costs, a redundancy scheme was proposed with one-way connection to the looped main pipelines, additionally looping the pipelines of the heat supply systems between two boiler rooms. The calculation of losses in the event of an emergency in the heating system was carried out.Conclusion. The most important problem requiring immediate solution is how to increase the reliability and redundancy of the heat supply system itself, in order to achieve minimal discomfort for consumers of heat energy at the time of failure of the source or transmission of the heat supply system. The proposed method for increasing the reliability of operation of heat supply systems is characterized by a high efficiency, since allows the number of idle hours and the total amount of short-received heat to be reduced. 

Optimal Expansion and Reconstruction of Heat Supply Systems

2013 ◽  
Vol 2 (4) ◽  
pp. 59-79 ◽  
Author(s):  
V. A. Stennikov ◽  
T. B. Oshchepkova ◽  
N. V. Stennikov
Keyword(s):  
Heat Supply ◽  
Optimal Allocation ◽  
Heat Supply System ◽  
Real Problem ◽  
Supply Networks ◽  
System A ◽  
Pumping Stations ◽  
Heat Supply Systems ◽  
Integrated Technique ◽  
Supply Systems

The paper addresses the issue of optimal expansion and reconstruction of heat supply systems, which includes a set of general and relatively specific problems. Therefore, a comprehensive approach to their solving is required to obtain a technically admissible and economically sound result. Solving the problem suggests search for effective directions in expansion of a system in terms of optimal allocation of new heat sources, their type, output, operating area; construction of new heat networks, their schemes and parameters; optimal detection of “bottlenecks” in the system and ways of their elimination (expansion, dismantling, replacement, strengthening of heat pipeline sections, construction of pumping stations and other components of heat supply networks). The authors present a mathematical statement of the problem, its decomposition into separate subproblems and an integrated technique to solve it. Consideration is given to a real problem solved for a real heat supply system. A set of arising problems is presented. The application of developed methodological and computational tools is shown.

On the feasibility and possibility of heating water for district heating systems through the use of heat of the main condensate after cogeneration turbines

2018 ◽  
Vol 11 (2) ◽  
pp. 117-125
Author(s):  
M. E. Orlov ◽  
M. M. Zamaleev ◽  
A. V. Kuz’min ◽  
V. I. Sharapov
Keyword(s):  
Energy Efficiency ◽  
Heat Supply ◽  
District Heating ◽  
Feed Water ◽  
Regression Equations ◽  
Regeneration System ◽  
District Heating System ◽  
Makeup Water ◽  
Heat Supply Systems ◽  
Supply Systems

The possibilities of increasing the efficiency of cogeneration turbines of CHP plants through the use of low-potential heat carriers for water heating in district heat supply systems and increasing the generation of CHP electricity are considered. The existing technologies of heating the makeup water of the district heating system upstream water treatment apparatuses do not always provide the required heating temperature and do not have the sufficient energy efficiency. The technologies of using the main condensate of the exhaust steam in the turbine to heat the feed water in additional heaters included in the system of regeneration of cogeneration turbines are developed. The use of these technologies contributes to increasing the flow rate and reducing the enthalpy of the steam of regenerative outlets of the turbine used to heat this condensate, and, therefore, increases the combined heat and power generation. In order to determine the industrial applicability of the proposed solutions, experimental studies of the regeneration systems of turbo-units under the conditions of Ulyanovsk СHPPs-1 have been carried out. Multiparameter data arrays on operation of turbine condensate-feed path have been collected, and regression equations have been obtained to calculate the main condensate flow temperatures depending on various factors. On the basis of experimental data there have been calculated the minimum and maximum flow rates of feed water that can be heated to the desired temperature in the surface heaters included in the regeneration system of the turbines, the flow graphs of the heated feed water are constructed depending on the temperature of the main condensate after the turbines. The fields of application of the proposed technological solutions in operating heat supply systems are defined. The evaluation of energy efficiency is carried out using the method of specific generation of CHP electricity and conventional fuel economy at the implementation of the proposed solutions is calculated.

scholarly journals Principles of process modeling of the heat supply systems operation

2018 ◽  
Vol 196 ◽  
pp. 02052
Author(s):  
Anna Doroshenko ◽  
Anastasiya Yusupova
Keyword(s):  
Process Modeling ◽  
Heat Supply ◽  
Heat Supply System ◽  
Qualitative Assessment ◽  
System Operation ◽  
Special Software ◽  
Simulated System ◽  
Pipeline Route ◽  
Heat Supply Systems ◽  
Supply Systems

The problem of process modeling of heat supply systems operation with the appropriate of the special software is presented in the article. The purpose of the simulation is to identify the most likely and dangerous accidents, the quantitative and qualitative assessment of them, the frequency of their occurrence, the size of the damage, etc. The implementation of the solution presented in the work is already useful at present to improve the design and further operation of heat supply systems, and as a consequence also for consumers of thermal energy. The use of simulated modeling of heat supply system operation processes significantly reduces the strength calculation time, allows simulating various pipeline route configurations, performing their comparative analysis, and choosing optimal characteristics for the simulated system.

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