scholarly journals Failure analysis of SA210-C steel pipe in power plant

2021 ◽  
Vol 257 ◽  
pp. 01064
Author(s):  
Hai Zhao ◽  
Chong Jiang ◽  
Zhiwei Gao ◽  
Chengchuan Tian
Keyword(s):  
Composition Analysis ◽  
Test Results ◽  
Boiler Water ◽  
Water Wall ◽  
Xrd Phase Analysis ◽  
Chemical Composition Analysis ◽  
Liquid Wall ◽  
Water Wall Tube ◽  
Main Factor

The reason and mechanism of the failure of SA210-C steel liquid wall were analyzed by means of macro morphology analysis, chemical composition analysis, microstructure analysis and XRD phase analysis. The test results show that the main reason for the failure of SA210-C steel water wall tube is the corrosion under the inner wall scale, and the long-term unqualified boiler water quality is the main factor causing the corrosion of water wall.

scholarly journals Simulation and optimization of water-wall tube panels design for power boilers

2019 ◽  
Vol 298 ◽  
pp. 00112
Author(s):  
Maxim P. Kurepin ◽  
Mikhail Yu. Serbinovskiy
Keyword(s):  
Computation Time ◽  
Optimization Method ◽  
Structure Design ◽  
Wall Structure ◽  
Orthotropic Plates ◽  
Boiler Water ◽  
Simulation And Optimization ◽  
Water Wall ◽  
State Models ◽  
Water Wall Tube

The article presents a water-wall tube panels simulation technique that uses finite element method as well as the power boiler water-wall structure design optimization method. Results of the proposed method verification and its application to the design of boilers of different capacities are discussed. The technique is to replace water-wall tube panels with equivalent plates. Replacement plates’ parameters calculation is reported, panels one-way heating metering is described. Optimization of the water-wall structure design is carried out in two stages: at the first stage, water-wall tube panels are replaced with orthotropic plates; at the second stage, sub-simulation with solid models is used to identify problem areas of the design. Solid-state models of the problem areas get connected to the orthotropic plates at calculated boundary conditions. The described approach improves accuracy of the simulation results and significantly reduces the models complexity and its computation time. The proposed simulation and optimization method has been tested and successfully applied to design power steam boilers with steam generating capacity of 500, 1030 and 1900 tons of steam per hour. As a result, while maintaining the specified reliability and durability, significant reduction of metal content in boiler structure is achieved.

Characterization of the Oxide Scale Formed on T12 Water Wall Tube After Long-term Service in Supercritical Power Plant

2019 ◽  
Vol 91 (5-6) ◽  
pp. 705-727 ◽  
Author(s):  
Xiangyu Zhong ◽  
Fethi Hamdani ◽  
Jian Xu ◽  
Tetsuo Shoji ◽  
Tadashi Tatsuki ◽  
...  
Keyword(s):  
Power Plant ◽  
Oxide Scale ◽  
Water Wall ◽  
Water Wall Tube

XRD and Microstructural Analyses on Biodegradable Mg Alloys

2015 ◽  
Vol 638 ◽  
pp. 79-84 ◽  
Author(s):  
Carmen Iulia Crimu ◽  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Iulian Vasile Antoniac ◽  
Madalina Nicoleta Matei ◽  
...  
Keyword(s):  
Stress Shielding ◽  
Complete Healing ◽  
Biodegradable Materials ◽  
Composition Analysis ◽  
New Bone Formation ◽  
Long Time ◽  
Chemical Composition Analysis ◽  
Orientation Parameters ◽  
Biocompatible Alloys

Stainless steels, titanium and titanium alloys are the most widely used artificial surgical biomaterials for a long time. These alloys with non-degradability properties present long-term adverse effects or stress shielding and require a second surgery for a complete healing. The ongoing scientific research to avoid this problem found a new kind of biocompatible alloys for implants made of biodegradable materials witch should be used as alternative. Among the various biodegradable materials, magnesium alloys have unique biodegradability properties in the physiological environment, have stimulatory effects on new bone formation and have an elastic modulus similar to that of human bone. Roentgen structural analysis was used to detail the global chemical composition analysis, especially the analysis to determine the phase-pick sites characteristic diffraction and crystallographic orientation parameters Miller constituent phases. On studied alloys Mg and Mg2Ca type compounds with different crystallographic orientations were identified. The results obtained on the Mg-Ca and Mg-Ca-Si systems will be correlated with results from previous tests and analyses, to finally obtain an alloy with biodegradability that may be controlled.

Electrochemical Property Study of Water-Wall Tube 20G in SO42- Medium at Room Temperature

2013 ◽  
Vol 676 ◽  
pp. 31-34
Author(s):  
Mao Dong Li ◽  
Xue Ying Tang ◽  
Yu Hui Du ◽  
Juan Liu ◽  
Jun Ming Zhao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Property ◽  
Room Temperature ◽  
Ac Impedance ◽  
Wall Material ◽  
Tube Material ◽  
Boiler Water ◽  
Water Wall ◽  
Phosphate Treatment ◽  
Water Wall Tube

In the article, the effect of SO42-on the corrosion behavior of boiler water-wall material 20G under the equilibrium phosphate treatment (EPT) was studied by a series of electrochemical experiments at room temperature. Electrodes AC impedance value (Rp) was used to evaluate the corrosion resistance of the material. The experiment results show that, SO42-ion is aggressive anion; water-wall tube material 20G has certain sensitive corrosion to the SO42-. The 20G electrode AC impedance value decreases with the increase of the SO42-’s concentration and the material corrosion resistance reduces.

Failure Analysis of Spiral Water Wall Tube Cracking in Ultra-Supercritical Power Plant Boiler

2016 ◽  
Author(s):  
Jun Si ◽  
Zhenrong Yan ◽  
Jianjun Chen
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Power Plant ◽  
Failure Analysis ◽  
Power Plants ◽  
Composition Analysis ◽  
Element Analysis ◽  
Water Wall ◽  
Water Wall Tube ◽  
Weld Heat

The efficiency of conventional boiler/steam turbine fossil power plants has strong relationship to the steam temperature and pressure. At present, steam temperatures of the most efficient fossil power plants are now in the 600°C range. Higher-strength materials are needed for upper water wall tube of boilers with steam pressure above 24 MPa. A high-strength 2.5%Cr steel recently approved by ASME code as T23 is the preferred candidate material for this application. Due to its superior properties, T23 steel is typically not post-weld heat treated. However, after several years running there are a lot of incident reports for T23 tubes especially the breakage of weldment in the ultra-supercritical power plant. This is cause for concern for T23 tubes weldment used under high temperature environments. Previous studies showed that the residual stress may play an important role to the performance of spiral water wall tube. In this paper, the distribution of residual stress in T23 tube weldment has been investigated in detail. Inner wall cracks were found at the butt-jointed seam region of spiral water wall tubes by radiographic testing after one year’s operation. Failure analysis of the spiral water wall tube cracking was conducted by chemical composition analysis, mechanical testing and finite element analysis in this paper. It was found that localized residual stress after the weld process caused concentrated stress, which is the primary reason for failure. Our studies illustrate the necessity of post weld heat treatment for the T23 tubes used under high temperature.

Investigation on the welding-induced multiple failures in boiler water wall tube

2021 ◽  
Vol 121 ◽  
pp. 104988
Author(s):  
Kexiu Liu ◽  
Xiaoliang Feng ◽  
Kuo Ma ◽  
Lian Wang ◽  
Xiaowu Xie ◽  
...  
Keyword(s):  
Boiler Water ◽  
Multiple Failures ◽  
Water Wall ◽  
Water Wall Tube

Failure Analysis of the Corroded Water Wall Tube in a 50MW Thermal Power Plant

2018 ◽  
Vol 37 (9-10) ◽  
pp. 995-999 ◽  
Author(s):  
Guohua Yang ◽  
Yuanbo Gou ◽  
Xinshi Liu ◽  
Xiaoming Zhang ◽  
Tuo Zhang
Keyword(s):  
High Temperature ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Energy Dispersive Spectrometer ◽  
Thermal Power ◽  
Effective Means ◽  
High Temperature Corrosion ◽  
Boiler Water ◽  
Water Wall ◽  
Water Wall Tube

AbstractHigh temperature corrosion of the water wall tube in a 50 MW thermal power plant was investigated which caused several boiler accidents. X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS) were used to observe the cross-sectional morphology of the tube and analyze the oxide scales. Results show that the boiler water and the coal quality did not meet the requirements. High temperature corrosion of water wall tubes was attributed to the using of coal which had a higher ash content and lower received lower heating value. Higher dissolved oxygen and incrustation in the boiler water caused serious corrosion at the inner surface of water wall tube, which led to the possibility of decarburization and degradation of the steel. Suitable coal blending and stability of the thermal load were the effective means to prevent the high temperature corrosion of the tube.

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