Failure Analysis on Boiler Industrial Extraction Steam Pipe

2013 ◽  
Vol 750-752 ◽  
pp. 2160-2164
Author(s):  
Xue Xia Xu ◽  
Yan Ting Feng ◽  
Yong Wang ◽  
Hao Ke ◽  
Xiao Guang Niu ◽  
...  
Keyword(s):  
Outer Wall ◽  
Composition Analysis ◽  
Pipe System ◽  
Eds Analysis ◽  
Large Pressure ◽  
Drainage Design ◽  
Microstructure Examination ◽  
Steam Pipe ◽  
Chemical Composition Analysis ◽  
Sem Microstructure

Failure reason of boiler extraction steam pipe was discussed by means of macro-observation, chemical composition analysis, metallurgical and SEM microstructure examination and EDS analysis. Results showed that the crack initiated from original corrosion flaw on outer wall of the extraction pipe, propagated rapidly under large pressure caused by water-hammer due to no drainage design in the unit pipe system until final bursting.

Fracture Analysis on Drainage Pipe Socket of Boiler

2013 ◽  
Vol 690-693 ◽  
pp. 1771-1774
Author(s):  
Xue Xia Xu ◽  
Yan Ting Feng ◽  
Yong Wang ◽  
Xiao Guang Niu ◽  
Qing Wang ◽  
...  
Keyword(s):  
Fracture Analysis ◽  
Nucleation Site ◽  
Creep Process ◽  
Composition Analysis ◽  
Long Period ◽  
Fine Grain ◽  
Micro Cracks ◽  
Microstructure Examination ◽  
Drainage Pipe ◽  
Sem Microstructure

Rupture reason of boiler drainage pipe socket was analyzed by means of chemical composition analysis, macro-observation, metallurgical and SEM microstructure examination. Results showed that the rupture of the drainage pipe socket was a result of creep cracking initiated in intercritical zone of HAZ due to long period operation under high temperature. During creep process, carbides precipitated on fine grain boundaries of intercritical zone and grew up gradually into new coarse carbides as favorite nucleation site for creep void. With the growth, coalesce and connection of creep voids carries on, micro-cracks formed on original austenite boundaries and finally led to fracture of weld joint.

scholarly journals Correction: Yu, D.Q., et al. Microscopic Characteristic and Chemical Composition Analysis of Three Medicinal Plants and Surface Frosts. Molecules 2019, 24, 4548

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 379
Author(s):  
Da Qing Yu ◽  
Xiao Jing Han ◽  
Ting Yu Shan ◽  
Rui Xu ◽  
Jin Hu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Medicinal Plants ◽  
Composition Analysis ◽  
Microscopic Characteristic ◽  
Chemical Composition Analysis

The authors would like to correct an error in the title paper [...]

Chemical composition analysis of carbohydrate fragmentation products

2021 ◽  
Vol 156 ◽  
pp. 105112
Author(s):  
Samin Fathalinejad ◽  
Esben Taarning ◽  
Peter Christensen ◽  
Jan H. Christensen
Keyword(s):  
Chemical Composition ◽  
Composition Analysis ◽  
Chemical Composition Analysis

Research on Process Mineralogy of Potassium-Rich Shale

2010 ◽  
Vol 158 ◽  
pp. 197-203 ◽  
Author(s):  
Jie Liu ◽  
Yue Xin Han ◽  
Wan Zhong Yin
Keyword(s):  
Chemical Composition ◽  
Mineral Composition ◽  
Potassium Feldspar ◽  
Composition Analysis ◽  
Research Results ◽  
Dsc Analyses ◽  
Process Mineralogy ◽  
Mineral Compositions ◽  
Chemical Composition Analysis

The process mineralogy of potassium-rich shale from Chaoyang of Liaoning, China, was studied. Research results showed there are much less variety and smaller quantities in mineral compositions. Calculated mineral composition by means of chemical composition analysis combined with XRD, MLA, IR and TG-DSC analyses showed that main minerals with were Potassium-feldspar, muscovite, biotite and illite, and gangue minerals were quartz and small amounts of hematite. Potassium-rich minerals such as potassium-feldspar and muscovite contact smoothly with quartz respectively, and there was the direction arrangement among potassium-feldspar, quartz and muscovite in the shale. And quartz and hematite were main cement in the shale. The influences of the research results on the potassium extraction from potassium-rich shale were distinct.

Analysis and Suggestions on Leakage of Boiler Low Temperature Reheater

2013 ◽  
Vol 341-342 ◽  
pp. 341-344
Author(s):  
Xue Xia Xu ◽  
Yan Ting Feng ◽  
Hao Ke ◽  
Xiao Guang Niu ◽  
Qing Wang
Keyword(s):  
Low Temperature ◽  
Structural Design ◽  
Stress Condition ◽  
Comprehensive Analysis ◽  
Composition Analysis ◽  
Weak Zone ◽  
Welding Seam ◽  
Microstructure Examination ◽  
Pipeline Vibration ◽  
Metallurgical Microstructure

Leakage causes of boiler low temperature reheater were discussed by means of macroscopic inspection, chemical composition analysis, metallurgical microstructure examination, SEM and EDS fracture analysis. Results showed that the reheater leakage occurred for cracks originating from the fillet seam of ear plate. The main causes lie in improper structural design of the ear plate welding directly on the reheater elbow where suffered from complicated stress condition, wall thinning and out-of-round. In addition, as a weak zone, heat effect zone of the fillet welding seam was more likely to crack under fatigue stress for frequent unit start and stop and pipeline vibration. Installation stress existed between the ear plate and support block also contributed to the cracking. Suggestions were provided to avoid similar accident based on the comprehensive analysis of leakage causes.

Verification of creep analyzes of a steam pipe system, Swedish Energy Agency

Impact ◽  
2018 ◽  
Vol 2018 (1) ◽  
pp. 86-88
Author(s):  
Jan Storesund ◽  
Rikard Norling
Keyword(s):  
Energy Agency ◽  
Pipe System ◽  
Steam Pipe

scholarly journals Fermentation process optimization and chemical composition analysis on black tea wine

2021 ◽  
Vol 233 ◽  
pp. 02052
Author(s):  
Chun Zou ◽  
Yongquan Xu ◽  
Jianxin Chen ◽  
Ruyi Li ◽  
Fang Wang ◽  
...  
Keyword(s):  
Organic Acids ◽  
Fermentation Process ◽  
Black Tea ◽  
Composition Analysis ◽  
Optimal Conditions ◽  
Tea Leaves ◽  
Alcohol Content ◽  
Tea Infusion ◽  
Chemical Composition Analysis ◽  
Aroma Components

In this study, the fermentation process of black tea wine was optimized, and the changes in catechins, organic acids, and aroma components during fermentation were investigated. The optimal fermentation conditions for tea wine were determined as follows: the addition of 15% sucrose and 0.75% tea leaves, and a fermentation temperature of 25 ºC. Under the optimal conditions, the alcohol content and sensory evaluation score of tea wine were 8.9 %ABV and 88, respectively. The contents of catechins and organic acids in tea wine were 21.29 mg/L and 3.68 mg/mL, which were 1.32-fold and 10.51-fold higher than those of tea infusion, respectively. L-malic acid was the main organic acid in tea wine, which accounted for 56.3% of the total amount of organic acids. A total number of 34 and 33 kinds of aroma components were detected in tea wine and tea infusion, respectively. The main aroma components of tea wine were esters and alcohols, which accounted for 39.7% and 45.9% of the total amount of aroma components, respectively, while the main aroma components of tea infusion were esters and aldehydes, accounting for 34.6% and 33.2%, respectively.

scholarly journals Chemical composition analysis of the essential oil of Solanumn nigrum L. by HS/SPME method and calculation of the biochemical coefficients of the components

2017 ◽  
Vol 10 ◽  
pp. S2372-S2375 ◽  
Author(s):  
Avat (Arman) Taherpour ◽  
Mohammad Mehdi Khodaei ◽  
Baram Ahmed Hama Ameen ◽  
Majid Ghaitouli ◽  
Nosratollah Mahdizadeh ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Composition Analysis ◽  
Chemical Composition Analysis

Comparison of machine learning techniques to optimize the analysis of plutonium surrogate material via a portable LIBS device

2021 ◽  
Author(s):  
Ashwin P. Rao ◽  
Phillip R. Jenkins ◽  
John D. Auxier II ◽  
Michael B. Shattan
Keyword(s):  
Machine Learning ◽  
Chemical Composition ◽  
Machine Learning Techniques ◽  
Composition Analysis ◽  
Learning Techniques ◽  
Chemical Composition Analysis

Enhancing the analytical capabilities of a hand-held LIBS device for chemical composition analysis of a plutonium surrogate using different machine learning paradigms.

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