The Retrofit of High-Temperature Corrosion Prevention and Operation Adjustment for 600-MW Supercritical Boiler

doi:10.11930/j.issn.1004-9649.2014.4.56.3

Abstract

Abstract: The high-temperature corrosion was discovered in large area of the fire-side water-walls at the burner zones in one 600-MW supercritical boiler. In order to mitigate the possible risk to the water-wall operation, the retrofit of the boiler combustion system and the optimal design on the main burners with great impacts on both sidewalls are carried out. Meanwhile, three layers of close-to-wall air are installed along the front and back water-walls to reduce the concentration of de-oxidation atmosphere near the water-walls. Through the adjustment of the horizontal and vertical air distribution in the furnace, the negative effects of tube wall overheat in high-temperature heating areas, the increase of CO concentration in the rear pass and the uneven distribution of NO_x emission concentration caused by the installation of the three layers of close-to-wall air are effectively harnessed. After the retrofit, the factors causing high-temperature corrosion of boiler water walls are constrained, the average volume fraction of CO near the sidewalls is about 0.02%, and that of H₂S is less than 60×10^-6. Additionally, the boiler efficiency and the NO_x emission concentration are almost kept at the same level as those before the retrofit, which shows the good overall performance of the boiler.

Key words: supercritical boiler, swirl burner, water-wall, high-temperature corrosion, close-to-wall air

CLC Number:

TK223.2

CHEN Min-sheng, LIAO Xiao-chun. The Retrofit of High-Temperature Corrosion Prevention and Operation Adjustment for 600-MW Supercritical Boiler[J]. Electric Power, 2014, 47(4): 56-59.

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https://www.electricpower.com.cn/EN/Y2014/V47/I4/56

References

[1] 徐远鹏. 锅炉水冷壁高温腐蚀原因及对策[J]. 中国电力,2005, 38（10）：76-79.
XU Yuan-peng. The cause and solution for high temperature corrosion on boiler water wall[J]. Electric Power, 2005, 38(10):76-79.
[2] 李敏,丘纪华,向军,等. 锅炉水冷壁高温腐蚀运行工况的防腐模拟[J]. 中国电机工程学报,2002,22（7）：150-154.
LI Min, QIU Ji-hua, XIANG Jun, et al . An anti-corrosion simulation for the high temperature corrosion on boiler water-wall during different operation[J]. Proceedings of the CSEE, 2002, 22(7): 150-154.
[3] 焦庆丰,姚斌. 电厂锅炉水冷壁高温腐蚀程度判别技术研究[J]. 中国电力,2004,37（10）：46-49.
JIAO Qing-feng, YAO Bin. Research on the identification technology of water wall’s high-temperature corrosion extent in the utility boiler [J]. Electric Power, 2004, 37(10): 46-49.
[4] 王建平,徐连勇,许永泰,等. FeCrAl和高镍铬合金涂层的抗高温腐蚀性能研究[J]. 中国电力,2007,40（4）：54-57.
WANG Jian-ping, XU Lian-yong, XU Yong-tai, et al . Study on high temperature corrosion resistance of FeCrAl and NiCr alloy coating [J]. Electric Power, 2007, 40(4): 54-57.
[5] 付红,张伯权,李勇. 水冷壁的高温腐蚀及防护[J]. 热力发电,2007,36（11）：81-83.
FU Hong, ZHANG Bai-quan, LI Yong. Study on high-temperature corrosion of water-wall in utility boiler and prevention thereof [J]. Thermal Power Generation, 2007, 36(11): 81-83.
[6] 陈敏生,廖晓春,楼杰. 对冲燃烧锅炉水冷壁高温腐蚀问题的探讨[J]. 电站系统工程,2013,29（5）：33-36.
CHEN Min-sheng, LIAO Xiao-chun, LOU Jie. Discussion on high-temperature corrosion of water wall in opposed firing boiler[J]. Power System Engineering, 2013, 29(5): 33-36.
[7] 吴超义. 锅炉水冷壁高温腐蚀特性试验研究[D]. 杭州：浙江大学,2003.
[8] 梁绍华,黄磊,张恩先. 锅炉高温腐蚀在线监测技术的研究[J]. 动力工程,2009,29（12）：1093-1128.
LIANG Shao-hua, HUANG Lei, ZHANG En-xian. Study on on- line monitoring technology for high temperature corrosion of boilers[J]. Journal of Power Engineering, 2009, 29(12): 1093-1128.
[9] 刘建全,孙保民,张广才,等. 1 000 MW超超临界旋流燃烧锅炉稳燃特性数值模拟与优化[J]. 中国电机工程学报,2012,32（8）：19-27.
LIU Jiang-quan, SUN Bao-min, ZHANG Guang-cai, et al . Numerical simulation and optimization on stable combustion of a 1 000 MW ultra supercritical unit swirl combustion boiler[J]. Proceedings of the CSEE, 2012, 32(8): 19-27.

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