Classification of Corrosion Behavior of Water Wall Tube Materials in Simulated Coal Combustion Atmospheres Including H2S

2011 ◽  
Vol 696 ◽  
pp. 260-265 ◽  
Author(s):  
Shin Najima ◽  
Masahiko Morinaga ◽  
Hiromi Shirai
Keyword(s):  
Corrosion Behavior ◽  
Coal Combustion ◽  
Scale Structure ◽  
Water Wall ◽  
Mixed Gases ◽  
Water Wall Tube

To obtain an indicator for evaluating the amount of corrosion of water wall tube materials in a coal-fired boiler, we investigated the effect of H2S and SO2 concentration on the amount of corrosion of Fe-2.25wt.%Cr-1wt.%Mo (STBA24) alloy at 773K in N2-CO-CO2-H2-H2O-H2S-SO2 mixed gases. As a result, it was clarified that the amount of corrosion and the scale structure were not affected by concentrations of H2S and SO2 when they were above 150ppm and 200ppm, receptively, at fixed PO2 and PS2. Therefore it appears that the amount of corrosion in this range of concentrations can be evaluated only from the correlation between PO2 and PS2. In contrast, under the condition of less than 150ppm SO2 or less than 200ppm H2S, the amount of corrosion was affected by the concentrations of SO2 and H2S. Therefore, it appears that the concentrations of SO2 and H2S are necessary to evaluate the amount of corrosion when the concentrations of SO2 and H2S are less than 150ppm and 200ppm, respectively. An indicator for evaluating the amount of corrosion was able to be proposed as a function of H2S and SO2 concentrations in coal combustion atmospheres. Introduction

Water Wall Tube Cracking in an Ultra-Supercritical Boiler Caused by Deep Peaking

2021 ◽  
Author(s):  
Zhidong Fan ◽  
Qingwu Wang ◽  
Kun Niu ◽  
Jingjing Jia ◽  
Zhibo Zhang ◽  
...  
Keyword(s):  
Water Wall ◽  
Water Wall Tube

scholarly journals High temperature corrosion of water wall tube in coalfired combustion gases

1993 ◽  
Vol 03 (C9) ◽  
pp. C9-787-C9-796 ◽  
Author(s):  
K. Nakagawa ◽  
M. Kitagawa ◽  
Y. Tumita ◽  
S. Ooki
Keyword(s):  
High Temperature ◽  
High Temperature Corrosion ◽  
Combustion Gases ◽  
Water Wall ◽  
Water Wall Tube

The Numerical Calculation of the Temperature Field of Water-Wall Tube of the Supercritical Boiler under Near-Critical Condition

2014 ◽  
Vol 875-877 ◽  
pp. 1876-1880
Author(s):  
Chun Yan Li
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Working Conditions ◽  
Thermal Calculation ◽  
Spiral Tube ◽  
Heat Transfer Deterioration ◽  
Water Wall ◽  
Working Medium ◽  
The Mean ◽  
Water Wall Tube

The spirally water wall are distributed on the plane and divided into seven sections. The mean heat flux of each section is determined using furnace thermal calculation in sections. The value of the pressure and temperature concerning the working medium at inlet and outlet of each tube are established by calculating enthalpy increasing. The vaporizing processes of the working medium in the spiral tube under the three working conditions: 70%BMCR, 65%BMCR and 60%BMCR are analyzed. The state of the working medium and the possibility of the heat transfer deterioration are estimated. More reliable references are provided for the appearance of the heat transfer deterioration.

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.

Failure Analysis and Welding Repair for Water Wall Connection Tube Burst of SA210C Steel

2014 ◽  
Vol 998-999 ◽  
pp. 422-425 ◽  
Author(s):  
Xiang Feng Zheng ◽  
Nan Wu ◽  
Yun Jian Jiang ◽  
Wen Bin Li ◽  
Xiao Jun Hao ◽  
...  
Keyword(s):  
Residual Stress ◽  
Chemical Analysis ◽  
Failure Analysis ◽  
Heat Input ◽  
Mechanical Analysis ◽  
Raw Material ◽  
Material Defects ◽  
Microscope Analysis ◽  
Water Wall ◽  
Water Wall Tube

Through methods, such as microscope analysis, mechanical analysis, chemical analysis, metallography examination etc, the causes resulting in water wall tube bursting of 300MW station boiler have been analyzed. The raw material defects is the primarily inducement of bursting failure. In welding tube, the measures of reducing residual stress, such as lower welding heat input, reducing thickness of welding layer and so on, were taken. The welding repair succeeded greatly.

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