ELF radiation from the Tromsø “Super Heater” Facility

1991 ◽  
Vol 18 (6) ◽  
pp. 1035-1038 ◽  
Author(s):  
R. Barr ◽  
P. Stubbe
Keyword(s):  
Super Heater

Failure analysis of the super heater tubes of S-combined power plant

2010 ◽  
Vol 17 (4) ◽  
pp. 864-872 ◽  
Author(s):  
Beom-Soo Kim ◽  
Jung-Chel Chang ◽  
Yong-keun Jung ◽  
Jae-jin Jung
Keyword(s):  
Power Plant ◽  
Failure Analysis ◽  
Super Heater

Reliability Analysis of Engineering Systems

2017 ◽  
pp. 154-176
Author(s):  
Taha-Hossein Hejazi ◽  
Hossein Poursabbagh
Keyword(s):  
High Stress ◽  
Engineering Systems ◽  
Creep Failure ◽  
Reliability Based Design ◽  
Accelerated Life ◽  
Short Period ◽  
Boiler Tubes ◽  
Super Heater ◽  
Design Stress ◽  
Test Process

Nowadays, reliability and reliability-based design in any system has become very important. There are some parts in many systems that designing their test process take too much time and money in order to be analyzed for their reliability. Boilers, as the hearts of plants, contain various components. One of the most important components is Super-heater tubes. Creep failure is the most common failure mode in these tubes which grows faster by increasing the temperature. Accelerated Life Testing (ALT) is used to study the performance of a component under high stress in a short period of time and use of the test result in order to assess the performance of the component under design stress in a desired lifetime. In this chapter, the reliability of Super-heater boiler tubes in plants was examined by applying ALTs. The obtained results indicated that considering the life of components at the beginning of the test, reusing them under the same stress did not exhibit desirable reliability. Furthermore, some recommendations have been suggested to improve the reliability.

Study on Fracture Failures of the Super Heater Water Pipe Boiler

2020 ◽  
Vol 402 ◽  
pp. 20-26
Author(s):  
Husaini ◽  
Nurdin Ali ◽  
Teuku Edisah Putra ◽  
Faleri Armia ◽  
Akhyar
Keyword(s):  
Crack Propagation ◽  
Heat Recovery ◽  
Elevated Temperatures ◽  
Steam Pressure ◽  
Initial Crack ◽  
Steam Boiler ◽  
Water Pipe ◽  
Final Failure ◽  
Super Heater ◽  
Scanning Electron

The purpose of this study was to analyse the failure of the super heater pipe of the Heat Recovery Steam Boiler Generator (HRSG), which had broken. Investigations are carried out in several stages. First of all, the microstructure of the pipe was observed using an Optic Olympus GX71 Microscope and a Scanning Electron Microscope (SEM) was used to observe the fracture surface to find the initial crack. Thereafter, chemical composition testing, to determine the type of material used in the super heater pipe. The presence of deformation by creep was due to overheating seen on the super heater pipes. Moreover, It was due to operating at elevated temperatures and pressures with long operating times. This condition caused the thickness of the pipe to thin so that it would break due to crack propagation which penetrated the wall of the pipe until breaking as the material was no longer able to withstand the steam pressure inside the pipe. Obviously that this condition indicates that the crack propagation occurred until final failure.

INFLUENCE OF DEPOSITION AND FOULING ON WALL TEMPERATURE DISTRIBUTION IN CONVECTIVE PATH

2020 ◽  
pp. 1-21
Author(s):  
Deli Li ◽  
Enlu Wang ◽  
Jinda Mao ◽  
Wei Wu ◽  
Yiyang Wang
Keyword(s):  
Temperature Distribution ◽  
Surface Temperature ◽  
Temperature Control ◽  
Theoretical Calculations ◽  
Influence Factors ◽  
Control Technology ◽  
Tube Surface ◽  
Gas Temperature ◽  
Surface Distribution ◽  
Super Heater

Abstract To develop a method of controlling the deposit tube surface temperature, the rules of deposition and fouling on the fireside, and the influence factors of the surface distribution were determined through experiments and theoretical calculations. The surface temperature distribution of a clean tube was compared with that of a deposit tube. Through theoretical calculations, the influence factors of the deposit tube surface temperature were evaluated. Based on the investigation, surface temperature control technology applicable to a super-heater was proposed and the feasibility of this heater was determined. A bimodal distribution was obtained when the temperature distribution of the deposit tube was plotted as a function of the angle, whereas a unimodal distribution was obtained for the clean tube. The results revealed that the heat exchange tube surface temperature is most effectively controlled by controlling the flue gas temperature. Prior to the development of higher performance materials (compared with conventional materials), surface temperature control technology can be used to ensure that the super-heater surface temperature lies below the allowable temperature of existing super-heater materials.

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