Hartwalzen zur Festigkeitssteigerung wälzbelasteter Funktionsflächen

2021 ◽  
Vol 68 (3-4) ◽  
pp. 46-49
Author(s):  
Helmut Hochbein ◽  
Sascha Appelt
Keyword(s):  
Power Generation ◽  
Service Life ◽  
Failure Mechanisms ◽  
Border Zone ◽  
Functional Surfaces

The service life of functional surfaces subjected to rolling loads is limited by fatigue or insuffi cient separation of the rolling partners in the event of inadequate lubrication. These failure mechanisms can be counteracted by hard rolling and thus the introduction of residual compres sive stresses into the border zone, which can, among other things, extend maintenance intervals of production or power generation plants.

scholarly journals Research and design of grid connection and waste heat utilization of marine generating units

2020 ◽  
Vol 165 ◽  
pp. 06003
Author(s):  
Anning Yi ◽  
Hongtao Guo
Keyword(s):  
Power Generation ◽  
Service Life ◽  
Temperature Difference ◽  
Electromagnetic Interference ◽  
Frequency Conversion ◽  
Waste Heat ◽  
Economic Benefits ◽  
Energy Output ◽  
Utilization Rate ◽  
Energy Unit

This work is based on the use of waste heat from the temperature difference semiconductor heat exchanger, which can effectively use the waste heat in the exhaust gas, and convert it into electrical energy output through the temperature difference semiconductor material, which can increase engine efficiency and reduce energy consumption; at the same time, it can reduce engine noise and vibration. Extended service life. Due to the strong electromagnetic interference and severe vibration of the generator, there are few remote control devices on the market for the generator. This project uses a 2.4G wireless communication module to control the frequency conversion and speed regulation of the generator. In order to save manpower, start remotely, stop as soon as possible, monitor the operating status of the waste heat temperature difference power generation, reasonably replace the power, start quickly, and reach the electromechanical Integrated product. The realization of intelligent frequency conversion technology can adjust the engine speed according to different electrical appliances, adapt to external loads, realize automatic voltage adjustment, and save fuel consumption. The grid-connected system solves the frequency and phase problems of generators of different models, generations, and manufacturers in parallel, and realizes the re-mixing of old generators, which greatly improves the service life of engines and the best power generation supply, and reduces power generation systems and storage. The configuration cost of the energy unit improves the comprehensive utilization rate of the equipment, has a higher working efficiency, has good economic benefits, and can achieve the purpose of energy saving and emission reduction.

Coatings for Advanced Large Frame Combustion Turbines for Power Generation

2003 ◽  
Author(s):  
R. Viswanathan ◽  
N. S. Cheruvu ◽  
K. S. Chan
Keyword(s):  
Power Generation ◽  
Failure Mechanisms ◽  
Peak Load ◽  
Computer Code ◽  
Specific Power ◽  
Remaining Life ◽  
Metallic Coatings ◽  
Degradation Modeling ◽  
Power Company ◽  
Base Load

Use of metallic coatings for protecting hot section blades and vanes of combustion turbines for power generation has been a common practice for the last three decades. Since these coatings have to be optimized both with respect to different forms of corrosion and operation (base load vs. peak load) their performance can be machine specific. Power company users generally do not have sufficient knowledge of the failure mechanisms of the coatings and the basis for selecting coatings to suit their specific requirements. This paper describes the evolution of metallic coatings, discusses failure mechanisms, and describes a methodology for comparing and selecting machine-specific coatings. The methodology, which can be used to rank and predict the remaining life of coatings and for optimizing operation, forms the basis of a computer code known as COATLIFE. The ingredients of this methodology, i.e., degradation modeling and thermomechanical fatigue life (TMF) prediction, are reviewed in the paper.

scholarly journals Evaluation of Some Parameters of Hard Surfacing Treatment of the Functional Surfaces of Forestry Tools

2018 ◽  
Vol 26 (4) ◽  
pp. 222-226 ◽  
Author(s):  
Miroslava Ťavodová ◽  
Daniela Kalincová ◽  
Ivana Slováková
Keyword(s):  
Service Life ◽  
Impact Loading ◽  
Base Material ◽  
Microscopic Analysis ◽  
Working Environment ◽  
Basic Material ◽  
Hard Surface ◽  
Base Materials ◽  
Functional Surfaces ◽  
Hardness Tests

Abstract In this paper we discuss the possibility of increasing service life of tools used in forestry for mulching of undesirable forest growths. In a heterogeneous working environment in which they are operated, such tools are subjected to constant abrasion and impact loading. There are several ways how to extend their service life and operational fitness. One of these is hard surface treatment, or hard surfacing of their functional surfaces. In our experiment, we chose suitable hard surfacing materials and applied these on the sample materials using the MMA and MAG welding. The hard surface was applied in an one layer. Subsequently, we performed hardness tests, microscopic analysis of the structure of the basic material and the hard surface and evaluation of the fusion penetration of the base material with the hard surfacing weld. Fusion is crucial as it determines the cohesiveness of the weld and base materials and thus also the actual extension of the service life of the tools.

Reliability and Failures of Electronic Components /Systems

2021 ◽  
Vol 69 (2) ◽  
pp. 76-82
Author(s):  
Titu-Marius BĂJENESCU
Keyword(s):  
Service Life ◽  
Failure Mechanisms ◽  
Passivation Layer ◽  
Electronic Systems ◽  
Electronic Components ◽  
Reliability Management ◽  
And Training

The typical bathtub curve and its “standard” shape have been widely accepted as an engineering tool in reliability management and training. The paper is not only focused on the performance at different periods but trying to reveal some in-depth considerations regarding service life and reliability, defect and failure, failure categories and classifications, failure mechanisms, factors favouring electronic systems failures, the process problems, or the passivation layer.

Troubleshooting Turbine Steam Path Damage

2002 ◽  
Author(s):  
Thomas McCloskey
Keyword(s):  
Power Generation ◽  
Fossil Fuel ◽  
Failure Mechanisms ◽  
Economic Loss ◽  
Primary Objective ◽  
Steam Turbines ◽  
Utility Industry ◽  
Root Cause ◽  
Efficiency Losses

Steam path damage, particularly of rotating and stationary blading, has long been recognized as a leading cause of steam turbine unavailability for large fossil fuel plants worldwide. Turbine problems cost the utility industry as much as one billion dollars per year. Failures of blades, discs, and rotors in both fossil and nuclear steam turbines, represent a serious economic loss of availability and reliability for electric power generation suppliers and other energy supplies worldwide. Turbine problems such as deposition and erosion of blades can result in severe efficiency losses, resulting in significant economic penalties. The primary objective of this paper is to provide a methodology to identify the underlying damage or failure mechanisms, determine the root cause, and choosing immediate and long-term actions to lessen or prevent recurence of the problem.

scholarly journals Innovation of Biomass Crusher by Application of Hardfacing Layers

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1283
Author(s):  
Ján Viňáš ◽  
Janette Brezinová ◽  
Jakub Brezina ◽  
Peter Hermel
Keyword(s):  
Service Life ◽  
Arc Welding ◽  
Metallographic Analysis ◽  
Wire Electrode ◽  
Internal Defects ◽  
Welding Method ◽  
Functional Surfaces ◽  
Manual Arc Welding

This paper presents the innovation possibilities of the crushers functional parts and the results of layers’ renovation analyses of the surfaces worn by biomass crusher hammers. The worn functional surfaces of hammers made of Hardox 400 material were renovated by manual arc welding method (welded with a filled wire electrode with its own protection). As an additive material, Lincore 60-O tubular wire from Lincoln Electric was used. The quality of weld layers was assessed on the metallographic sections, where the presence of internal defects was monitored, and the microstructures of welds were identified. In addition to the metallographic analysis, the microhardness in terms of EN ISO 9015-2 was assessed. Based on the performed experiments, it is suitable for the crusher innovation to recommend the chain replacement with a shaped weldment made of Hardox 400 material, the weldability of which is very good, and to make at least one hardfacing layer on its functional surfaces. With this innovation, the service life of the crushing segment could be extended by more than ten-fold.

Evaluation of the Power-Generation Capacity of Implantable Thermoelectric Power Generator Driven by Radioisotope Fuel

2011 ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Power Generation ◽  
Service Life ◽  
Thermoelectric Power ◽  
Thermal Energy ◽  
Temperature Difference ◽  
Radioactive Isotope ◽  
Thermoelectric Generator ◽  
Power Generator ◽  
Thermoelectric Power Generator ◽  
Generation Capacity

The unique merit of the implantable thermoelectric generator lies in its direct utilization of the temperature difference intrinsically existing throughout the whole biological body. Therefore, it can resolve the service life mismatch between the IMD and its battery. In order to promoting the TEG maximum power, a piece of radioisotope fuel was fixed on the TEG hot junction. Recurring to the thermal energy released during disintegration of radioactive isotope, it can guarantee a marked promotion in the temperature difference across the implanted TEG; consequently apply enough power for the IMDs.

Experience with the Introduction of SAFT Testing in Volume Production of Large Forged Parts

NDT World ◽  
2021 ◽  
pp. 18-24
Author(s):  
Johannes Vrana ◽  
Alexander Zimmer ◽  
Karsten Schörner ◽  
Hubert Mooshofer ◽  
Karsten Kolk
Keyword(s):  
Power Generation ◽  
Detection Limit ◽  
Service Life ◽  
Synthetic Aperture ◽  
Forged Parts ◽  
Volume Production ◽  
Critical Components ◽  
Level 2 ◽  
Sensitive Testing ◽  
Large Rotor

Large rotor forged parts, which are usually one of the most critical components in land-based turbines and generators for power generation, require a complex volumetric test for a sufficient service life. This is usually performed manually or automatically with ultrasound. New requirements, designs and materials require more sensitive testing. This can be achieved by SAFT, also called ultrasound computer tomography. SAFT is based on the Synthetic Aperture Radar (SAR) and has been further developed by several universities. The introduction of SAFT in the volume production of large forged parts was achieved by the introduction of the quantitative SAFT developed by Siemens, also called AVG or DGS-SAFT, which allows an evaluation of each voxel in units of a replacement reflector, and by an acceleration that allows the reconstruction of the complete volume of a large forged component, which could be obtained when the SAFT test was introduced into volume production. The challenges for level 2/3 reviewers are discussed, such as volume-corrected display of results, handling of large amounts of data, focusing of displays, amplitude representation in units of a replacement reflector and handling of the software. Furthermore, it is shown how displays are represented by SAFT, how the detection limit can be determined in the case of quantitative SAFT, and which artifacts can occur during series testing with SAFT.

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