Safety and reliability optimisation of captive power plants using intelligent maintenance scheduling

2006 ◽  
Vol 1 (1/2) ◽  
pp. 155 ◽  
Author(s):  
Dusmanta Kumar Mohanta ◽  
Pradip Kumar Sadhu ◽  
R. Chakrabarti
Keyword(s):  
Power Plants ◽  
Maintenance Scheduling ◽  
Intelligent Maintenance ◽  
Safety And Reliability

scholarly journals Intelligent Maintenance Prioritization and Optimization Strategies for Thermal Power Plant Boilers

2019 ◽  
Vol 8 (3S) ◽  
pp. 31-35
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Work Productivity ◽  
Maintenance Scheduling ◽  
Maintenance Cost ◽  
Steam Boiler ◽  
Intelligent Maintenance ◽  
Steam Boilers ◽  
Maintenance Activities ◽  
Hierarchy Process

Steam boiler also known as steam generator is an integral component in thermal power plants requiring effective maintenance scheduling to extend the overall life cycle of the boiler. However, steam boilers are commonly plagued with issues such as boiler shutdown and tube leakage. Industry experts adopted preventative maintenance to overcome the repetition of outage in steam boilers. This method is flawed in the aspect of redundant maintenance activities. The repetition in maintenance activities will lead to reduced work productivity and increased maintenance operational costs. In this study, a maintenance optimization system specialized in ranking, prioritization and optimization based on Analytical Hierarchy Process (AHP) and Particle Swarm Optimization (PSO) are chosen. The AHP is used to rearrange the maintenance activities according to its priority while the PSO is an intelligent swarm used to optimize the operational duration and maintenance cost based on the result formed from AHP after implemented using MATLAB software. This work proposes maintenance scheduling based on minimization of the objectives focusing on the forming new list of the maintenance activities with the optimal operational duration and maintenance cost.

Recent Patents on Valve Mechanism Device

2020 ◽  
Vol 13 (3) ◽  
pp. 230-241
Author(s):  
Ye Dai ◽  
Hui-Bing Zhang ◽  
Yun-Shan Qi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Flow Direction ◽  
Research Progress ◽  
Valve Mechanism ◽  
Advantages And Disadvantages ◽  
Valve Structure ◽  
Valve Leakage ◽  
Safety And Reliability

Background: Valves are an important part of nuclear power plants and are the control equipment used in nuclear power plants. It can change the cross-section of the passage and the flow direction of the medium and has the functions of diversion, cutoff, overflow, and the like. Due to the earthquake, the valve leaks, which will cause a major nuclear accident, endangering people's lives and safety. Objective: The purpose of this study is to synthesize the existing valve devices, summarize and analyze the advantages and disadvantages of various devices from many literatures and patents, and solve some problems of existing valves. Methods: This article summarizes various patents of nuclear-grade valve devices and recent research progress. From the valve structure device, transmission device, a detection device, and finally to the valve test, the advantages and disadvantages of the valve are comprehensively analyzed. Results: By summarizing the characteristics of a large number of valve devices, and analyzing some problems existing in the valves, the outlook for the research and design of nuclear power valves was made, and the planning of the national nuclear power strategic goals and energy security were planned. Conclusion: Valve damage can cause serious safety accidents. The most common is valve leakage. Therefore, the safety and reliability of valves must be taken seriously. By improving the transmission of the valve, the problems of complicated valve structure and high cost are solved.

Temperature Measurement Applications in Power Plants

2009 ◽  
Author(s):  
Ravi Jethra
Keyword(s):  
Power Plant ◽  
Temperature Measurement ◽  
Power Plants ◽  
New Technologies ◽  
Measurement Information ◽  
Safety Integrity Level ◽  
Safety And Reliability ◽  
Technical Advances ◽  
Incorrect Measurement ◽  
Major Equipment

Temperature is one of the most widely measured parameters in a power plant. Temperature is monitored and also used for control in some areas. The paper covers some of the basics of Temperature measurement, and leads into some of the technical advances that impart higher a degree of safety and reliability to power plant operation. These advances are based on some of the latest and innovative technologies that are being implemented in process instrumentation. Irrespective of the type of power plant (coal-fired, Oil or gas based), temperature measurement remains high on the list for operational excellence throughout the plant. Implementation of some of the new technologies results in improved Safety and lower installation and maintenance costs. Incorrect measurement information due to temperature effects, non linearity or stability can result in major equipment getting damaged. Ensuring instruments that have minimal downtime from a maintenance standpoint, not just devices that have been evaluated to provide Safety Integrity Level service in Safety Instrumented Systems, is crucial for daily operations in a power plant.

Analytical Evaluation of Unsteady Thermal Hydraulic Characteristics in Shell and Tube Heat Exchangers

2006 ◽  
Author(s):  
Shiro Takahashi ◽  
Yuichi Narumi ◽  
Kiyoshi Ishihama ◽  
Akihito Yokoyama ◽  
Toyohiko Tsuge ◽  
...  
Keyword(s):  
Heat Exchangers ◽  
Nuclear Power ◽  
Power Plants ◽  
Tube Bundle ◽  
Fluid Temperature ◽  
Detached Eddy Simulation ◽  
Tube Heat Exchanger ◽  
Eddy Simulation ◽  
Safety And Reliability ◽  
Cfd Analyses

Many shell & tube heat exchangers are used in nuclear power plants. Unsteady thermal hydraulic phenomena have been studied in shell & tube heat exchangers to improve their safety and reliability and to extend their lifetime based on experience obtained from long periods of plant operation. We investigated unsteady flow in shell & tube heat exchangers by using computational fluid dynamics (CFD) analyses. The inlet flow on the shell side was separated and flow in several directions. A large part of the flow crossed over the tube bundle, and some parts of the flow took two circuitous roots (up and down) along the inner surface of the shell. Separated circuitous flows collided again where a baffle plate had been cut off. A pair of symmetric vortexes could be seen in that location. Some parts of the circuitous flow moved backwards into the tube bundle due to vortexes. These vortexes were unstable and changed their size and location. A pair of vortexes changed from symmetric to asymmetric. As a result, the direction of flow in the tube bundle near the vortexes changed continuously. Variations in vortexes simulated through CFD analyses could also be seen in tests on the actual size. Fluid temperature fluctuations around tubes were also evaluated through CFD analyses. Unsteady phenomena with changes from symmetric to asymmetric vortexes could be observed in the shell & tube heat exchanger and were simulated through CFD analyses with a detached eddy simulation (DES) turbulence model.

Utility of Projection Network for Air-Craft-Engine Fault Diagnosis

2004 ◽  
Author(s):  
Chaiyakorn Jansuwan ◽  
C. James Li
Keyword(s):  
Network Architecture ◽  
Power Plants ◽  
Dynamic Network ◽  
Aircraft Engine ◽  
Parameter Tuning ◽  
Critical Systems ◽  
Safety And Reliability ◽  
Compressor Inlet ◽  
Detection And Diagnosis ◽  
Projection Network

Turbine engines are frequently used in critical systems including the power plants and propulsion systems of aircrafts and ships. Frequent inspection and periodic maintenance have been necessary to ensure their proper functionality. Condition based maintenance of jet engines can significantly reduce their operational and maintenance costs, and, in the mean time, enhance safety and reliability. This study investigates the feasibility of establishing the utility of a dynamic network, i.e., projection network, to recognize hot air pass faults from measurements of e.g., fan speed, core speed, compressor inlet and exit temperatures and pressures, turbine exit temperatures, etc. Projection network is a nonlinear dynamic network architecture that provides stable oscillatory or non-oscillatory attractors. In contrast to the static mapping provided by e.g., neural networks and fuzzy systems, the projection network offers more functionality through its rich dynamics. When properly setup, its nonlinear dynamics can filter out noise from measurements, and classify/recognize complex patterns. This study established the utility of projection network for detection and diagnosis of several aircraft engine faults. This paper will also describe methods for both structure training and parameter tuning. Using these methods, projection networks were setup to recognize baseline, fan damage, high pressure turbine fault, and customer bleed valve fault.

Nuclear Fission, Today and Tomorrow: From Renaissance to Technological Breakthrough (Generation IV)

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Georges Van Goethem
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Fission ◽  
Natural Uranium ◽  
Low Carbon ◽  
Nuclear Facilities ◽  
Research Issues ◽  
Low Carbon Economy ◽  
Safety And Reliability ◽  
Gen Iv

To better understand the industrial and political contexts of nuclear innovation, it is necessary to consider the history of nuclear fission technologies (four generations of nuclear power plants): (1) GEN I (construction 1950–1970): early prototypes, using mainly natural uranium as fuel, graphite as moderator, and CO2 as coolant (built at the time of “Atoms for Peace,” 1953); (2) GEN II (yesterday, construction 1970–2000): safety and reliability of nuclear facilities and energy independence (in order to ensure security of supply); (3) GEN III (today, construction 2000–2040): continuous improvement of safety and reliability, and increased industrial competitiveness in a worldwide growing energy market; (4) GEN IV (tomorrow, construction from 2040): for increased sustainability (optimal utilization of natural resources and waste minimization) and proliferation resistance. The focus in this paper is on the design objectives and research issues associated to the latter generation IV. Their benefits are discussed according to a series of ambitious criteria or technology goals established at the international level (generation IV international forum (GIF)). One will have to produce not only electricity at lower costs but also heat at very high temperatures, while exploiting a maximum of fissile and fertile matters, and recycling all actinides, under safe and reliable conditions. Scientific viability studies and technological performance tests for each system are being carried out worldwide, in line with the GIF agreement (2001). Their commercial deployment is planned for 2040. In Sec. 6, it is shown to what extent GEN IV can be considered as a beneficial, responsible, and sustainable response to the societal and industrial challenges of the future low-carbon economy.

Sign in / Sign up

Export Citation Format

Share Document