燃煤工业锅炉黏性积灰和露点腐蚀耦合机理

doi:10.11949/j.issn.0438-1157.20170697

化工学报 ›› 2017, Vol. 68 ›› Issue (12): 4774-4783.DOI: 10.11949/j.issn.0438-1157.20170697

燃煤工业锅炉黏性积灰和露点腐蚀耦合机理

陈衡, 潘佩媛, 赵钦新, 梁志远, 王云刚

西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室, 陕西西安 710049

收稿日期:2017-05-31 修回日期:2017-08-08 出版日期:2017-12-05 发布日期:2017-12-05
通讯作者: 赵钦新
基金资助:
国家重点研究发展计划项目（2016YFC0801904）；国家自然科学基金项目（51606144）。

Coupling mechanism of viscose ash deposition and dewpoint corrosion in industrial coal-fired boiler

CHEN Heng, PAN Peiyuan, ZHAO Qinxin, LIANG Zhiyuan, WANG Yungang

Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China

Received:2017-05-31 Revised:2017-08-08 Online:2017-12-05 Published:2017-12-05
Supported by:
supported by the National Key Research and Development Program of China (2016YFC0801904) and the National Natural Science Foundation of China (51606144).

摘要/Abstract

摘要：

通过现场实验研究了燃煤工业锅炉的黏性积灰和露点腐蚀耦合机理，在现场测试了不同壁面温度（90、80、70、60、50和40℃）下20^#碳钢实验段的积灰和腐蚀特性，然后利用XRF、XRD和SEM-EDS对灰样和金属试样进行了系统理化分析。结果表明，当壁面温度低至70℃时，H₂SO₄开始在壁面上冷凝并沉积，引起黏性积灰和露点腐蚀。随着壁面温度的降低，实验段上的积灰量和腐蚀层厚度不断增加。当壁面温度降至40℃时，HCl开始在壁面上冷凝并加重积灰和腐蚀。烟气中的飞灰可以通过吸附冷凝的酸液并与其反应来减少壁面的黏性积灰和露点腐蚀。燃煤工业锅炉的低温受热面宜控制壁面温度在70℃以上，以减少酸液冷凝造成的黏性积灰和露点腐蚀。

关键词: 煤燃烧, 工业锅炉, 酸冷凝, 沉积物, 腐蚀, 烟气冷却

Abstract:

Viscose ash deposition and dewpoint corrosion in an industrial coal-fired boiler were investigated by field study of temperature-controlled mild steel 20^# test probes under different wall temperatures of 90℃, 80℃, 70℃, 60℃, 50℃ and 40℃. Ash deposits and metal samples were analyzed by X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS). The results showed that when wall temperature fell to 70℃, viscose deposits and dewpoint corrosion began to form on probes due to condensation of H₂SO₄ on wall surface. The deposit accumulation and corrosion depth increased with the decrease of wall temperature, when wall temperature was lower than 80℃. At wall temperature of 40℃, HCl started condesing on wall surface which further enhanced ash deposition and corrosion. The coupling mechanism of viscose ash depostion and dewpoint corrosion was discussed and it was proposed that fly ash in flue gas could absorb and react with acid condensation to reduce viscose ash deposit and corrossion. Therefore, in order to avoid or reduce deposition and corrosion, it is recommended that low-temperature heating surface in industrial coal-fired boilers should be maintained above 70℃.

Key words: coal combustion, industrial boiler, acid condensation, deposition, corrosion, flue gas cooling

中图分类号:

TK16

陈衡, 潘佩媛, 赵钦新, 梁志远, 王云刚. 燃煤工业锅炉黏性积灰和露点腐蚀耦合机理[J]. 化工学报, 2017, 68(12): 4774-4783.

CHEN Heng, PAN Peiyuan, ZHAO Qinxin, LIANG Zhiyuan, WANG Yungang. Coupling mechanism of viscose ash deposition and dewpoint corrosion in industrial coal-fired boiler[J]. CIESC Journal, 2017, 68(12): 4774-4783.

参考文献 30

[1]	王春晶. 中小燃煤工业锅炉节能减排途径及情景分析[J]. 洁净煤技术, 2016, 22(1):109-113. WANG C J. Energy-saving way analysis of small-medium coal-fired industrial boilers[J]. Clean Coal Technology, 2016, 22(1):109-113.
[2]	LIN P Y, JI J J, LUO Y H, et al. A non-isothermal integrated model of coal-fired traveling grate boilers[J]. Applied Thermal Engineering, 2009, 29(14/15):3224-3234.
[3]	赵钦新. 我国工业锅炉发展回顾与"十二五"展望[J]. 工业锅炉, 2011, (6):1-8. ZHAO Q X. Reviews and prospects in China's industrial boiler development[J]. Industrial Boiler, 2011, (6):1-8.
[4]	赵钦新, 周屈兰. 工业锅炉节能减排现状、存在问题及对策[J]. 工业锅炉, 2010, (1):1-6. ZHAO Q X, ZHOU Q L. Solutions, questions and status of China's industrial boiler[J]. Industrial Boiler, 2010, (1):1-6.
[5]	赵钦新, 杨文君, 孙一睿, 等. 燃煤工业锅炉污染物协同治理关键技术[J]. 工业锅炉, 2015, (6):1-9. ZHAO Q X, YANG W J, SUN Y R, et al. Key technologies of multi-pollutants synergia control in coa1-fired industrial boiler[J]. Industrial Boiler, 2015, (6):1-9.
[6]	刘含笑, 袁建国, 郦祝海, 等. 低低温工况下颗粒凝并机理分析及研究方法初探[J]. 电力与能源, 2015, 36(1):107-111. LIU H X, YUAN J G, LI Z H, et al. Mechanism analysis and research methods of particle coagulation under low-low temperature condition[J]. Power & Energy, 2015, 36(1):107-111.
[7]	XIANG B X, ZHANG M, YANG H R, et al. Prediction of acid dew point in flue gas of boilers burning fossil fuels[J]. Energy & Fuels, 2016, 30(4):3365-3373.
[8]	HOLMES D R. Dewpoint Corrosion[M]. Chichester:Ellis Horwood Limited, 1985:11-12.
[9]	张志刚. 新型低温省煤器潮湿积灰清除方法的理论研究[D]. 吉林:东北电力大学, 2015. ZHANG Z G. The theoretical study of wet fouling removal method on the new low temperature economizer[D]. Jilin:Northeast Electric Power University, 2015.
[10]	BARRERAS F, BARROSO J. Behavior of a high-capacity steam boiler using heavy fuel oil (Ⅱ):Cold-end corrosion[J]. Fuel Processing Technology, 2004, 86(2):107-121.
[11]	BLANCO J M, PENA F. Increase in the boiler's performance in terms of the acid dew point temperature:environmental advantages of replacing fuels[J]. Applied Thermal Engineering, 2008, 28(7):777-784.
[12]	MOAKHAR R S, MEHDIPOUR M, GHORBANI M, et al. Investigations of the failure in boilers economizer tubes used in power plants[J]. Journal of Materials Engineering and Performance, 2013, 22(9):2691-2697.
[13]	SHAYAN M R, RANJBAR K, HAJIDAVALLOO E, et al. On the failure analysis of an air preheater in a steam power plant[J]. Journal of Failure Analysis and Prevention, 2015, 15(6):941-951.
[14]	WANG Y G, ZHAO Q X, ZHANF Z X, et al. Mechanism research on coupling effect between dew point corrosion and ash deposition[J]. Applied Thermal Engineering, 2013, 54(1):102-110.
[15]	李飞, 孙奉仲, 史月涛. 积灰与酸耦合作用下套管换热器传热特性热态实验[J]. 化工学报, 2014, 65(8):2876-2881. LI F, SUN F Z, SHI Y T. Hot-state experiment on double-pipe heat exchanger under coupled effect of fouling and acid[J]. CIESC Journal, 2014, 65(8):2876-2881.
[16]	LIANG Z Y, ZHAO Q X, WANG Y G, et al. Coupling mechanism of dew point corrosion and viscous ash deposits[J]. Materials and Corrosion-Werkstoffe und Korrosion, 2014, 65(8):797-802.
[17]	LI Z M, SUN F Z, SHI Y T, et al. Experimental study and mechanism analysis on low temperature corrosion of coal fired boiler heating surface[J]. Applied Thermal Engineering, 2015, 80:355-361.
[18]	VUTHALURU H B, FRENCH D H. Investigations into the air heater ash deposit formation in large scale pulverised coal fired boiler[J]. Fuel, 2015, 140:27-33.
[19]	CHEN H, PAN P Y, CHEN X L, et al. Fouling of the flue gas cooler in a large-scale coal-fired power plant[J]. Applied Thermal Engineering, 2017, 117:698-707.
[20]	CHEN H, JIAO J, PAN P Y, et al. Deposit formation of the low-pressure economizer in a coal-fired thermal power plant[J]. Energy & Fuels, 2017, 31(5):4791-4798.
[21]	FLEMMING F, JORN H, PETER J, et al. Deposit formation and corrosion in the air pre-heater of a straw-heater of a straw-fired combined heat and power production boiler[J]. IFRF Combustion Journal, 2002:1-23.
[22]	RETSCHITZEGGER S, BRUNNER T, OBERNBERGER I. Low-temperature corrosion in biomass boilers fired with chemically untreated wood chips and bark[J]. Energy & Fuels, 2015, 29(6):3913-3921.
[23]	WANG Y G, MA H D, LIANG Z Y, et al. Experimental study on dew point corrosion characteristics of the heating surface in a 65t/h biomass-fired circulating fluidized bed boiler[J]. Applied Thermal Engineering, 2016, 96:76-82.
[24]	VAINIO E, KINNUNEN H, LAUREN T, et al. Low-temperature corrosion in co-combustion of biomass and solid recovered fuels[J]. Fuel, 2016, 184:957-965.
[25]	马海东, 王云刚, 赵钦新, 等. 生物质锅炉积灰特性与露点腐蚀[J]. 化工学报, 2016, 67(12):5237-5243. MA H D, WANG Y G, ZHAO Q X, et al. Characteristics of ash deposit and dew point corrosion in biofuel boiler[J]. CIESC Journal, 2016, 67(12):5237-5243.
[26]	徐通模, 林宗虎. 实用锅炉手册[M]. 北京:化学工业出版社, 2009:1-9. XU T M, LIN Z H. Practical Boiler Manual[M]. Beijing:Chemical Industry Press, 2009:1-9.
[27]	史培甫. 工业锅炉节能减排应用技术[M]. 北京:化学工业出版社, 2009:1-6. SHI P P. Application Technology of Energy Saving and Emission Reduction for Industrial Boilers[M]. Beijing:Chemical Industry Press, 2009:1-6.
[28]	赵钦新, 张知翔, 鲍颖群, 等. 一种用于烟气低温腐蚀性能研究的实验装置:201120029967.4[P]. 2011-08-17. ZHAO Q X, ZHANG Z X, BAO Y Q, et al. Test device for study on low-temperature corrosion of flue gas:201120029967.4[P]. 2011-08-17.
[29]	SRIVASTAVA R K, MILLER C A, ERICKSON C, et al. Emissions of sulfur trioxide from coal-fired power plants[J]. Journal of the Air & Waste Management Association, 2004, 54(6):750-762.
[30]	车得福, 庄正宁, 李军, 等. 锅炉[M]. 西安:西安交通大学出版社, 2008:387. CHE D F, ZHUANG Z N, LI J, et al. Boiler[M]. Xi'an:Xi'an Jiaotong University Press, 2008:387.

燃煤工业锅炉黏性积灰和露点腐蚀耦合机理

Coupling mechanism of viscose ash deposition and dewpoint corrosion in industrial coal-fired boiler

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