Analysis of Causes of Generator Vibration Faults and Rotor Cracking in a Power Plant

2019 ◽  
Vol 893 ◽  
pp. 39-44
Author(s):  
Bao Tong Chai ◽  
Qing Meng Zeng ◽  
Zheng Feng Wu
Keyword(s):  
Heat Treatment ◽  
Power Plant ◽  
Treatment Process ◽  
Dynamic Balance ◽  
Raw Material ◽  
Notch Sensitivity ◽  
Heat Treatment Process ◽  
Balance Test ◽  
Generator Rotor

The vibration of a generator in a power plant and the cause of rotor cracking wereanalyzed. The causes of generator rotor cracking were analyzed from the rotor raw material andheat treatment process. The results show that the brittleness and notch sensitivity of the rotormaterial are large due to the unreasonable heat treatment process of the rotor. When the stress isconcentrated, a cracking accident occurs. The generator rotor was returned to the manufacturingcompany for operation. At 3000 r•min-1, the generator's overhanging end vibrated greatly, and thefault was successfully eliminated by the dynamic balance test.

Analysis and Optimization of Heat Treatment Process for Lower Core Support Plate and Core Barrel of Reactor Vessel Internals

2017 ◽  
Author(s):  
Dongan Liu ◽  
Shaoxuan Lin ◽  
Zonghua Ding
Keyword(s):  
Heat Treatment ◽  
Power Plant ◽  
Nuclear Power ◽  
Treatment Process ◽  
Reactor Vessel ◽  
Heat Treatment Process ◽  
Safe Operation ◽  
Support Plate ◽  
General Rules ◽  
Fuel Assemblies

Lower Core Support Plate (LCSP) and Core Barrel (CB) are key components of reactor vessel internals. Especially, since the fuel assemblies are installed on the LCSP, its flatness is critical for the safe operation of fuel assemblies. However, for SM1 and HY1 nuclear power plant (NPP), after heat treatment of the weld between LCSP and CB, the LCSP deforms seriously and its flatness exceeds the limitation, which results in a time-consuming and costly reprocessing. A numerical model of heat treatment process between LCSP and CB was developed first. The general rules of temperature and deformation distribution of LCSP and CB were obtained. Also, an experiment was conducted to validate the model. With the validated model, the deformation mechanism of LCSP due to heat treatment is studied. At last, the heat treatment process between LCSP and CB was optimized to avoid similar issues for the following NPPs.

Production of Silicon Carbide via Grinding and Heat Treatment Process

2013 ◽  
Vol 594-595 ◽  
pp. 740-744
Author(s):  
Hidayu Jamil Noorina ◽  
W.H. Xian ◽  
W.M. Arif ◽  
Che Pa Faizul ◽  
Mohd Zaki Ruhiyuddin
Keyword(s):  
Heat Treatment ◽  
Silicon Carbide ◽  
Treatment Process ◽  
Raw Materials ◽  
Graphite Powder ◽  
Planetary Mill ◽  
Waste Glass ◽  
Raw Material ◽  
Carbide Formation ◽  
Heat Treatment Process

This study is to determine the properties and characterization of silicon carbide via grinding and heat treatment process. In this study, the raw materials used were waste glass and graphite powder. Silicon carbide was produced by milling and mixing waste glass and graphite powder in different grinding mills; planetary mill and ring mill. The samples were then heat treated at 700 °C for 1 hour soaking time. Two types of characterization procedures were completed to determine the properties and microstructure of silicon carbide. Formation of silicon carbide was only formed through grinding by planetary mill but not ring mill. This may due to the grinding mechanism of both mills. Due to the simple and low cost of raw material to form silicon carbide, silicon carbide has high potential to be one of the commercialized products. It has the potential in reducing waste and improves the environment quality.

scholarly journals Discussion on Heat Treatment Process of Welding Weld in Power Plant

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Jinbin Xu ◽  
Pengcheng Li ◽  
Junqi Dou
Keyword(s):  
Heat Treatment ◽  
Power Plant ◽  
Treatment Process ◽  
Current Situation ◽  
Heat Treatment Process ◽  
Construction Site ◽  
Power Stations ◽  
Improved Methods

 In order to improve the quality and efficiency of heat treatment in welds of power stations, this paper summarizes the current situation of 600 MW supercritical power plant welding site heat treatment and puts forward the improved methods and measures accordingly. The heat treatment of welding holes in the construction site Play a certain guiding role.

scholarly journals The characteristic of hardness and microstructure of extraction forceps for dental and oral care made of stainless-steel

2020 ◽  
Vol 1 (2) ◽  
pp. 56-63
Author(s):  
Nur Kholis ◽  
Nuryanto Nuryanto ◽  
Arif Mustofa
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Treatment Process ◽  
Oral Care ◽  
Raw Material ◽  
Heat Treatment Process ◽  
Cooling Channel ◽  
Tempering Temperature ◽  
Temperature Variations ◽  
Quenching Process

The reliability of medical devices such as extraction forceps is vital for dental and oral care. Apart from having hygienic properties, the extraction forceps must be strong and resistant to corrosion. This study evaluates the effects of tempering temperature on the hardness and microstructure of a medical device's material made from stainless-steel DIN 4021. In the experiments, a heat treatment process was carried out previously with a temperature of 1,050°C and a holding time of 20 minutes. A quenching process was conducted using a cooling channel that flowed with water at 10-20°C. After the heat treatment, the material was subjected to a tempering process with temperature variations of 200, 400, and 600°C. The research results indicated that the heat treatment process could increase the material's hardness value—the hardness value of the raw material changed from 20 to 48.67 HRC with the heat treatment. The tempering parameters resulted in the highest hardness value of 46.67 HRC at 200°C and the lowest value of 42.33 HRC at 600°C. Microstructure testing using optical microscopy showed that it produced ferrite, pearlite, and martensite structures. In contrast, the result of a microstructure testing using Scanning Electron Microscopy on the surface of the material is that the higher the tempering temperature, the larger the particles' area and dimension.

scholarly journals Position of Fe ions in MgO crystalline structure

Nukleonika ◽  
2015 ◽  
Vol 60 (1) ◽  
pp. 143-145 ◽  
Author(s):  
Jacek Szczerba ◽  
Ryszard Prorok ◽  
Paweł Stoch ◽  
Edyta Śnieżek ◽  
Ilona Jastrzębska
Keyword(s):  
Heat Treatment ◽  
Magnesium Oxide ◽  
Iron Oxides ◽  
Treatment Process ◽  
Raw Materials ◽  
Raw Material ◽  
Heat Treatment Process ◽  
Secondary Phases ◽  
Manufacturing Method ◽  
High Refractoriness

Abstract Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly influence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the influence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.

Optimization of Heat Treatment Process of ZE41A Magnesium Alloy Using Grey- Based Taguchi Method

2008 ◽  
Vol 3 (2) ◽  
pp. 63-69
Author(s):  
M. Sivapragash ◽  
◽  
V. Sateeshkumar ◽  
P.R. Lakshminarayanan ◽  
R. Karthikeyan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnesium Alloy ◽  
Taguchi Method ◽  
Treatment Process ◽  
Heat Treatment Process

EFFECT ON HARDNESS and MICRO STRUCTURAL BEHAVIOUR OF TOOL STEEL AFTER HEAT TREATMENT PROCESS

2017 ◽  
Vol 4 (24) ◽  
Author(s):  
Karanbir Singh ◽  
Aditya Chhabra ◽  
Vaibhav Kapoor ◽  
Vaibhav Kapoor
Keyword(s):  
Heat Treatment ◽  
Empirical Study ◽  
Tool Steel ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Structural Behaviour ◽  
Treatment Processes ◽  
En 31

This study is conducted to analyze the effect on the Hardness and Micro Structural Behaviour of three Sample Grades of Tool Steel i.e. EN-31, EN-8, and D3 after Heat Treatment Processes Such As Annealing, Normalizing, and Hardening and Tempering. The purpose of Selecting Tool Steel is Because Tool Steel is Mostly Used in the Manufacturing Industry.This study is based upon the empirical study which means it is derived from experiment and observation rather than theory.

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