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

被引：0
|
作者：
Chen H. [1 ]
Pan P. [1 ]
Zhao Q. [1 ]
Liang Z. [1 ]
Wang Y. [1 ]
机构：
[1] Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Zhao, Qinxin (zhaoqx@xjtu.edu.cn) | 2017年 / Materials China卷 / 68期
关键词：
Acid condensation; Coal combustion; Corrosion; Deposition; Flue gas cooling; Industrial boiler;
D O I：
10.11949/j.issn.0438-1157.20170697
中图分类号：
学科分类号：
摘要：
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℃. © All Right Reserved.
引用
收藏
页码：4774 / 4783
页数：9
相关论文
共 30 条
  • [1] Wang C.J., Energy-saving way analysis of small-medium coal-fired industrial boilers, Clean Coal Technology, 22, 1, pp. 109-113, (2016)
  • [2] Lin P.Y., Ji J.J., Luo Y.H., Et al., A non-isothermal integrated model of coal-fired traveling grate boilers, Applied Thermal Engineering, 29, 14-15, pp. 3224-3234, (2009)
  • [3] Zhao Q.X., Reviews and prospects in China's industrial boiler development, Industrial Boiler, 6, pp. 1-8, (2011)
  • [4] Zhao Q.X., Zhou Q.L., Solutions, questions and status of China's industrial boiler, Industrial Boiler, 1, pp. 1-6, (2010)
  • [5] Zhao Q.X., Yang W.J., Sun Y.R., Et al., Key technologies of multi-pollutants synergia control in coa1-fired industrial boiler, Industrial Boiler, 6, pp. 1-9, (2015)
  • [6] Liu H.X., Yuan J.G., Li Z.H., Et al., Mechanism analysis and research methods of particle coagulation under low-low temperature condition, Power & Energy, 36, 1, pp. 107-111, (2015)
  • [7] Xiang B.X., Zhang M., Yang H.R., Et al., Prediction of acid dew point in flue gas of boilers burning fossil fuels, Energy & Fuels, 30, 4, pp. 3365-3373, (2016)
  • [8] Holmes D.R., Dewpoint Corrosion, pp. 11-12, (1985)
  • [9] Zhang Z.G., The theoretical study of wet fouling removal method on the new low temperature economizer, (2015)
  • [10] Barreras F., Barroso J., Behavior of a high-capacity steam boiler using heavy fuel oil (Ⅱ): Cold-end corrosion, Fuel Processing Technology, 86, 2, pp. 107-121, (2004)
123