scholarly journals Evaluation of Various Maintenance Strategies for Reliability Assessment of Thermal Power Plants

2017 ◽  
Vol 7 (3) ◽  
pp. 617
Author(s):  
Sima Zarei ◽  
Peiman Ghaedi-Kajuei
Keyword(s):  
Power Plants ◽  
Probabilistic Models ◽  
Thermal Power ◽  
Electrical Power ◽  
Detailed Comparison ◽  
Deterministic Models ◽  
Time Intervals ◽  
Continuous Service ◽  
Deterministic And Probabilistic Approaches ◽  
Selection Of

In recent years, the world has had a phenomenal economic growth due to the acquisition of innovative technologies and globalization. In the meantime, electrical power plants are regarded as a fundamental element in industrial and production, and any deficiency in supplying may lead to significant financial detriment. Regard to the deep dependency of modern lifestyle to electricity, providing a high-quality and reliable electricity for consumers has taken on paramount importance. The reliability of a power plant depends on the configuration of elements and the reliability of each utility. The reliability, continuous service, flexibility in operation, simplicity, maintenance, development availability, meeting required standards etc. constitute the decisive factors for selection of a utility. Hence, each component of a power system must maintain the adequate level of reliability. In general, the maintenance approaches are classified into two parts: 1- The maintenance which must be carried out within determined and specified time intervals; 2- The maintenance which must be performed when required or in emergencies. To evaluate the maintenance and its effect on reliability, two types of deterministic and probabilistic approaches are presented. In this paper, a comprehensive description of both models is issued, and a detailed comparison is drawn. The results obviously show that the probabilistic models have considerable priority to deterministic models regard to their abilities for maximization of reliability or minimization of costs.

DEPENDENCE OF THE NOISE LEVEL OF DRY FAN COOLING TOWERS ON THE POWER OF THERMAL POWER PLANTS

2021 ◽  
Author(s):  
Владимир Борисович Тупов ◽  
Айнур Булатович Мухаметов
Keyword(s):  
Noise Level ◽  
Power Plants ◽  
Thermal Power ◽  
Electrical Power ◽  
Sound Level ◽  
Thermal Power Plants ◽  
Cooling Towers ◽  
Surrounding Area ◽  
Fan Cooling

Сухие вентиляторные градирни тепловых электрических станций могут быть источником превышения санитарных норм на территории станции и в окружающем районе. В статье проведен анализ уровня шума сухих вентиляторных градирен в зависимости от мощности тепловых электрических станций. Получена формула позволяющая определить изменение уровня звука сухих вентиляторных градирен в зависимости от электрической мощности тепловых электрических станций. Dry fan cooling towers of thermal power plants can be a source of exceeding sanitary standards on the territory of the plant and in the surrounding area. The article analyzes the noise level of dry fan cooling towers depending on the power of thermal power plants. A formula has been obtained that makes it possible to determine the change in the sound level of dry fan cooling towers depending on the electrical power of thermal power plants.

The State and Prospects of Development of Power Supply Systems of Metallurgical Enterprises with On-Site Power Plants

2021 ◽  
Vol 64 (4-5) ◽  
pp. 79-89
Author(s):  
Gennady Kornilov ◽  
◽  
Alexandra Varganova ◽  
Andrey Shemetov ◽  
Olga Gazizova ◽  
...  
Keyword(s):  
Power Supply ◽  
Alternative Energy ◽  
Power Plants ◽  
Thermal Power ◽  
Electrical Power ◽  
Electrical Equipment ◽  
Digital Twins ◽  
Complex Automation ◽  
Supply Systems ◽  
Special Meaning

The article considers the features of design of industrial power supply system of metallurgical enterprises with on-site electrical power generation. The problems of increasing the efficiency of the main electrical equipment of on-site power plants are formulated. The analysis of development trends in the energy sector of Russian metallurgy is carried out, on the basis of which the importance of industrial on-site power plants is shown. The problem of choosing a generator automatic excitation control system of on-site power plants is con-sidered and possible ways of its solution are given. The task of regime optimization of industrial on-site power plants is considered and original optimization algorithms are presented. Methods of increasing the reliability of power supply of critical equipment and mechanisms involved in the technological process of thermal power plants are proposed. The urgency of the tasks of complex automation and digitalization in the industrial power supply systems is shown, while the special meaning of "digital twins" is noted. Possible prospects for the development of on-site power plants in the context of the decarbonization policy and the transition to alternative energy are considered.

Deterministic and probabilistic approaches to geologic hazard assessment

2000 ◽  
Vol 6 (3) ◽  
pp. 209-226 ◽  
Author(s):  
William C. Haneberg
Keyword(s):  
Hazard Assessment ◽  
Probabilistic Models ◽  
Driving Mechanism ◽  
Rock Falls ◽  
Deterministic Models ◽  
Geologic Hazard ◽  
Random Behavior ◽  
Significant Difference ◽  
Simple Systems ◽  
Deterministic And Probabilistic Approaches

Abstract The occurrence of potentially hazardous geologic events such as landslides, rock falls, earthquakes, floods, and debris flows can be predicted using two fundamentally different approaches: deterministic and probabilistic. The most significant difference between the two approaches to geologic hazard assessment is whether a process is envisioned to be the result of an exact causal relationship or if some element of random behavior is assumed to be part of the system. Although the assumption of random behavior may seem self-defeating, it can provide a useful tool for the solution of important problems as long as the randomness can be quantified using statistical models. Each of these two methods can be approached either rationally (sing models derived from accepted physical or chemical principles) or empirically (by studying the occurrence of events without explicit regard to their driving mechanism). The complexity of the geologic process commonly dictates which approach is used for a particular problem, ranging from rational deterministic models for relatively simple systems such as small landslides to empirical probabilistic models for complicated processes such as floods and earthquakes. Examples of each type of model are discussed throughout the paper, primarily within the context of slope stability and the recurrence of extreme events such as floods.

Incorporating Uncertainty into Probabilistic Performance Models of Concentrating Solar Power Plants

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Clifford K. Ho ◽  
Gregory J. Kolb
Keyword(s):  
Power Plants ◽  
Probabilistic Models ◽  
Cost Model ◽  
Probabilistic Method ◽  
Thermal Power ◽  
Performance Model ◽  
Cumulative Distribution ◽  
Future Research ◽  
Distribution Models ◽  
Representative Sampling

A method for applying probabilistic models to concentrating solar-thermal power plants is described in this paper. The benefits of using probabilistic models include quantification of uncertainties inherent in the system and characterization of their impact on system performance and economics. Sensitivity studies using stepwise regression analysis can identify and rank the most important parameters and processes as a means to prioritize future research and activities. The probabilistic method begins with the identification of uncertain variables and the assignment of appropriate distributions for those variables. Those parameters are then sampled using a stratified method (Latin hypercube sampling) to ensure complete and representative sampling from each distribution. Models of performance, reliability, and cost are then simulated multiple times using the sampled set of parameters. The results yield a cumulative distribution function that can be used to quantify the probability of exceeding (or being less than) a particular value. Two examples, a simple cost model and a more detailed performance model of a hypothetical 100-MWe power tower, are provided to illustrate the methods.

scholarly journals Whisper and Roar

2014 ◽  
Vol 136 (07) ◽  
pp. 38-43
Author(s):  
Lee S. Langston
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
High Efficiency ◽  
Thermal Power ◽  
Electrical Power ◽  
Rankine Cycle ◽  
Combined Cycle ◽  
Marine Applications ◽  
Almost All

This article focuses on the use of gas turbines for electrical power, mechanical drive, and marine applications. Marine gas turbines are used to generate electrical power for propulsion and shipboard use. Combined-cycle electric power plants, made possible by the gas turbine, continue to grow in size and unmatched thermal efficiency. These plants combine the use of the gas turbine Brayton cycle with that of the steam turbine Rankine cycle. As future combined cycle plants are introduced, we can expect higher efficiencies to be reached. Since almost all recent and new U.S. electrical power plants are powered by natural gas-burning, high-efficiency gas turbines, one has solid evidence of their contribution to the greenhouse gas reduction. If coal-fired thermal power plants, with a fuel-to-electricity efficiency of around 33%, are swapped out for combined-cycle power plants with efficiencies on the order of 60%, it will lead to a 70% reduction in carbon emissions per unit of electricity produced.

scholarly journals Comparison of Cooling Systems in Power Plant Units

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6365
Author(s):  
Alexander Genbach ◽  
Hristo Beloev ◽  
David Bondartsev
Keyword(s):  
Power Plants ◽  
High Efficiency ◽  
Limit State ◽  
Thermal Power ◽  
Economic Effect ◽  
Electrical Power ◽  
Porous System ◽  
Porous Structures ◽  
Cooling Systems ◽  
Power Stations

A new porous system in power plants allowing the management of the crisis of heat exchange at boiling water in porous structures has been investigated. This study refers to the thermal power plants of electrical power stations and devices for cutting natural and artificial mineral media. Combustion chambers and supersonic nozzles were cooled by different porous structures. The optimum cell sizes of the porous structures were determined and data on the heat transfer capacity for the (critical) heat flow were obtained. A thermal device in the form of a rocket-type burner with a detonation jet showed high efficiency for capillary-porous and flow-through cooling systems. The economic effect per burner is not less than 200–300 dollars, and the coolant consumption is reduced by dozens of times, which is environmentally important. A comparative evaluation of the investigated structures and coatings has advantages over other cooling systems. The integration of mesh structures with capillary-porous coatings of natural mineral media produces a synergistic effect of combining them into a technology of their manufacturing, the expansion of critical loads removal and control of the limit state of the coatings.

The Air Cooled Condenser for Dry Countries

2006 ◽  
Author(s):  
Akbar Adibfar ◽  
Maryam Refan
Keyword(s):  
Power Plants ◽  
Cooling System ◽  
Thermal Power ◽  
Power Production ◽  
Water Shortage ◽  
Special Focus ◽  
Cooling Systems ◽  
Optimum Selection ◽  
Higher Power ◽  
Selection Of

A reliable and economic power production in thermal power plants depends highly upon the optimum selection of site equipment and their best possible arrangement. One of the most significant systems which play a crucial role in power production is the Cooling System. Playing the most pivotal role in back pressure of steam turbine, this system directly affects the power plant efficiency. This study analyzes the techno-economic aspect of Cooling System — with the special focus on ACC (Air Cooled Condenser) — due to the following advantages: Since ACC does not need water as the cooling medium, (not requiring medium fluid), it is been preferred over other cooling systems in dry regions. In addition to resolving the problem of water shortage in power plants, where there are environmental or geographical limitations, ACC is the best solution. The studies show that in the peak demand times, ACC has a much greater potential in higher power production in comparison to other dry cooling systems and thus can encourage the financer to consider ACC as an optimum alternative.

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