Analysis and Countermeasure of NH<sub>4</sub>HSO<sub>4</sub> Deposition Area of Air Preheater Heat Transfer Element

Li Mingcheng; Li Qiang; Ren Yanhui; Zhang Mingzhao; Li Guipeng; Liu Yu

doi:doi:10.11648/j.ijepe.20221103.12

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Analysis and Countermeasure of NH₄HSO₄ Deposition Area of Air Preheater Heat Transfer Element

Li Mingcheng, Li Qiang, Ren Yanhui, Zhang Mingzhao, Li Guipeng, Liu Yu

Published in International Journal of Energy and Power Engineering (Volume 11, Issue 3)

Received: 5 June 2022 Accepted: 25 July 2022 Published: 29 July 2022

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Abstract

According to the area where the air preheater is blocked, from the perspective of the physical properties of NH₄HSO₄, analyzed the reason of NH₄HSO₄ blockage in air preheater heat storage element caused by SCR flue gas denitration in boiler. The deposition of NH₄HSO₄ and low temperature corrosion occur in specific areas of the air preheater, the area is restricted by the gas temperature and the metal wall temperature. When the height of the heat storage piece in the cold section of the air preheater is insufficient, the bonding area of NH₄HSO₄ will span the upper part of the low temperature section and the lower part of the middle temperature section (the two-stage arrangement is the high temperature section), there is the situation that the mid-temperature section cannot be blown through, and the NH₄HSO₄ deposition area expands upward at low load. Through the characteristic temperature of NH₄HSO₄, combined with the flue gas temperature and wall-temperature of heat transfer element of rotary air preheater at different heights, a partitioning judgment method for the deposition process of NH₄HSO₄ in the air preheater was proposed. To solve the clogging problem of air preheater, firstly, the deposition area of NH₄HSO₄ should be concentrated into the cold end heat storage element by raising the height of the heat storage plate in the cold section, so that the soot blower can be blown through and centralized washing is convenient; secondly, the cold wave type with closed channel is selected to improve the soot blowing and washing effect.

Published in	International Journal of Energy and Power Engineering (Volume 11, Issue 3)
DOI	10.11648/j.ijepe.20221103.12
Page(s)	77-82
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

NH₄HSO₄, Deposition, Partitioning Judgment, Validation

References

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[3]	Shi Y J, Shu H, Zhang Y H, et al. Formation and decomposition of NH₄HSO₄ during selective catalytic reduction of NO with NH₃ over V₂O₅-WO₃/TiO₂ catalysts [J]. Fuel Processing Technology, 2016, 150 (141-7).
[4]	HUI Run-tang, WEI Fei, WANG Bao-de, YANG Ai-yong. Analysis and Prevention of SCR DeNOx-Caused Air Preheater Clogging [J]. Electric Power, 2014, 47 (10): 110-112.
[5]	WANG Xing, LIU Guo-zuo, ZHANG Zhi-qiang, et al. Comprehensive control technique of ABS blockage of air preheater in a 600 MW unit [J]. Thermal Power Generation, 2021, 2 (50): 132-137.
[6]	WANG Le-le, ZHOU Jian, YAO You-gong, et al. Evaluation on effects of SCR ammonia injection system modulation for flue gas system [J]. Electric Power, 2015, 48 (4): 16-22.
[7]	WANG Xin, CHEN Chen, LI Fu-bao. Countermeasure analysis of air preheater clogging in SCR denitration process [J]. Jilin electric power, 2012, 40 (6): 43-45.
[8]	WANG Hai-gang. Proposals for controlling air heater pluggage of SCR denitration units [J]. Environmental Engineering, 2016, 34 (2): 96-10.
[9]	LIANG Jun-jie, ZHANG Zhan-feng, ZHOU Jian, et al. Analysis on whole process operation data of SCR flue gas denitration system [J]. Thermal Power Generation, 2018, 47 (12): 93-99.
[10]	SONG Yu-bao, LIU Xin-hui, HE Chuan, et al. Study on the ammonium bisulfate deactivated SCR catalyst at low load operation [J]. Electric Power, 2019, 52 (1): 144-150.
[11]	CAI Pei, ZHAO Yang. Study on optimization scheme of SO₃ removal to prevent preheater clogging [J]. Electric Power Technology and Environmental Protection, 2016, 32 (3): 42-43.
[12]	YAN Wei-ping, HUANG Jing-li, LI Jun, et al. Calculation of minimum wall temperature and inlet air temperature ofregenerative air heater [J]. Thermal Power Generation, 2007, 36 (4): 47-49, 28.
[13]	LIANG Hai-wen, QIU Feng-xiang, YAO Xue-zhong, et al. Numerical calculation of inner temperature fields of rotary air preheaters [J]. East China Electric Power, 2009, 9 (37): 1614-1618.
[14]	LIU Fa-zhi, HE Jian-le, YANG Guo-hua. Retrofit of Heat Storage Elements in Air Preheater Based on Ammonium Bisulfate Blockage [J]. Modern Manufacturing Technology and Equipment. 2021. 8: 175-178.
[15]	ZHOU Qiang-tai, et al. Principles of Boilers (3rd Ed.) [M]. Beijing: China Electric Power Press, 2013: 315.
[16]	HUA NG Guo-qiang, HE Shuang-jiang, LIU Jun-lai, et al. Analysis and treatment of air preheater blockage in 600MW unit [J]. Hebei Electric Power Technology, 2013. 32 (1): 41-42, 46.

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APA Style

Li Mingcheng, Li Qiang, Ren Yanhui, Zhang Mingzhao, Li Guipeng, et al. (2022). Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. International Journal of Energy and Power Engineering, 11(3), 77-82. https://doi.org/10.11648/j.ijepe.20221103.12

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ACS Style

Li Mingcheng; Li Qiang; Ren Yanhui; Zhang Mingzhao; Li Guipeng, et al. Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. Int. J. Energy Power Eng. 2022, 11(3), 77-82. doi: 10.11648/j.ijepe.20221103.12

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AMA Style

Li Mingcheng, Li Qiang, Ren Yanhui, Zhang Mingzhao, Li Guipeng, et al. Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. Int J Energy Power Eng. 2022;11(3):77-82. doi: 10.11648/j.ijepe.20221103.12

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@article{10.11648/j.ijepe.20221103.12,
  author = {Li Mingcheng and Li Qiang and Ren Yanhui and Zhang Mingzhao and Li Guipeng and Liu Yu},
  title = {Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element},
  journal = {International Journal of Energy and Power Engineering},
  volume = {11},
  number = {3},
  pages = {77-82},
  doi = {10.11648/j.ijepe.20221103.12},
  url = {https://doi.org/10.11648/j.ijepe.20221103.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20221103.12},
  abstract = {According to the area where the air preheater is blocked, from the perspective of the physical properties of NH4HSO4, analyzed the reason of NH4HSO4 blockage in air preheater heat storage element caused by SCR flue gas denitration in boiler. The deposition of NH4HSO4 and low temperature corrosion occur in specific areas of the air preheater, the area is restricted by the gas temperature and the metal wall temperature. When the height of the heat storage piece in the cold section of the air preheater is insufficient, the bonding area of NH4HSO4 will span the upper part of the low temperature section and the lower part of the middle temperature section (the two-stage arrangement is the high temperature section), there is the situation that the mid-temperature section cannot be blown through, and the NH4HSO4 deposition area expands upward at low load. Through the characteristic temperature of NH4HSO4, combined with the flue gas temperature and wall-temperature of heat transfer element of rotary air preheater at different heights, a partitioning judgment method for the deposition process of NH4HSO4 in the air preheater was proposed. To solve the clogging problem of air preheater, firstly, the deposition area of NH4HSO4 should be concentrated into the cold end heat storage element by raising the height of the heat storage plate in the cold section, so that the soot blower can be blown through and centralized washing is convenient; secondly, the cold wave type with closed channel is selected to improve the soot blowing and washing effect.},
 year = {2022}
}

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TY  - JOUR
T1  - Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element
AU  - Li Mingcheng
AU  - Li Qiang
AU  - Ren Yanhui
AU  - Zhang Mingzhao
AU  - Li Guipeng
AU  - Liu Yu
Y1  - 2022/07/29
PY  - 2022
N1  - https://doi.org/10.11648/j.ijepe.20221103.12
DO  - 10.11648/j.ijepe.20221103.12
T2  - International Journal of Energy and Power Engineering
JF  - International Journal of Energy and Power Engineering
JO  - International Journal of Energy and Power Engineering
SP  - 77
EP  - 82
PB  - Science Publishing Group
SN  - 2326-960X
UR  - https://doi.org/10.11648/j.ijepe.20221103.12
AB  - According to the area where the air preheater is blocked, from the perspective of the physical properties of NH4HSO4, analyzed the reason of NH4HSO4 blockage in air preheater heat storage element caused by SCR flue gas denitration in boiler. The deposition of NH4HSO4 and low temperature corrosion occur in specific areas of the air preheater, the area is restricted by the gas temperature and the metal wall temperature. When the height of the heat storage piece in the cold section of the air preheater is insufficient, the bonding area of NH4HSO4 will span the upper part of the low temperature section and the lower part of the middle temperature section (the two-stage arrangement is the high temperature section), there is the situation that the mid-temperature section cannot be blown through, and the NH4HSO4 deposition area expands upward at low load. Through the characteristic temperature of NH4HSO4, combined with the flue gas temperature and wall-temperature of heat transfer element of rotary air preheater at different heights, a partitioning judgment method for the deposition process of NH4HSO4 in the air preheater was proposed. To solve the clogging problem of air preheater, firstly, the deposition area of NH4HSO4 should be concentrated into the cold end heat storage element by raising the height of the heat storage plate in the cold section, so that the soot blower can be blown through and centralized washing is convenient; secondly, the cold wave type with closed channel is selected to improve the soot blowing and washing effect.
VL  - 11
IS  - 3
ER  -

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Author Information

Li Mingcheng

Datang Dongying Power Generation Co. Ltd., Dongying, China
Li Qiang

Datang Northeast Electric Power Test and Research Institute Co. Ltd., Changchun, China
Ren Yanhui

Datang Northeast Electric Power Test and Research Institute Co. Ltd., Changchun, China
Zhang Mingzhao

Datang Dongying Power Generation Co. Ltd., Dongying, China
Li Guipeng

Datang Northeast Electric Power Test and Research Institute Co. Ltd., Changchun, China
Liu Yu

Datang Dongying Power Generation Co. Ltd., Dongying, China

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Plain Text BibTeX RIS

APA Style

Li Mingcheng, Li Qiang, Ren Yanhui, Zhang Mingzhao, Li Guipeng, et al. (2022). Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. International Journal of Energy and Power Engineering, 11(3), 77-82. https://doi.org/10.11648/j.ijepe.20221103.12

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ACS Style

Li Mingcheng; Li Qiang; Ren Yanhui; Zhang Mingzhao; Li Guipeng, et al. Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. Int. J. Energy Power Eng. 2022, 11(3), 77-82. doi: 10.11648/j.ijepe.20221103.12

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AMA Style

Li Mingcheng, Li Qiang, Ren Yanhui, Zhang Mingzhao, Li Guipeng, et al. Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element. Int J Energy Power Eng. 2022;11(3):77-82. doi: 10.11648/j.ijepe.20221103.12

Copy | Download

@article{10.11648/j.ijepe.20221103.12,
  author = {Li Mingcheng and Li Qiang and Ren Yanhui and Zhang Mingzhao and Li Guipeng and Liu Yu},
  title = {Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element},
  journal = {International Journal of Energy and Power Engineering},
  volume = {11},
  number = {3},
  pages = {77-82},
  doi = {10.11648/j.ijepe.20221103.12},
  url = {https://doi.org/10.11648/j.ijepe.20221103.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20221103.12},
  abstract = {According to the area where the air preheater is blocked, from the perspective of the physical properties of NH4HSO4, analyzed the reason of NH4HSO4 blockage in air preheater heat storage element caused by SCR flue gas denitration in boiler. The deposition of NH4HSO4 and low temperature corrosion occur in specific areas of the air preheater, the area is restricted by the gas temperature and the metal wall temperature. When the height of the heat storage piece in the cold section of the air preheater is insufficient, the bonding area of NH4HSO4 will span the upper part of the low temperature section and the lower part of the middle temperature section (the two-stage arrangement is the high temperature section), there is the situation that the mid-temperature section cannot be blown through, and the NH4HSO4 deposition area expands upward at low load. Through the characteristic temperature of NH4HSO4, combined with the flue gas temperature and wall-temperature of heat transfer element of rotary air preheater at different heights, a partitioning judgment method for the deposition process of NH4HSO4 in the air preheater was proposed. To solve the clogging problem of air preheater, firstly, the deposition area of NH4HSO4 should be concentrated into the cold end heat storage element by raising the height of the heat storage plate in the cold section, so that the soot blower can be blown through and centralized washing is convenient; secondly, the cold wave type with closed channel is selected to improve the soot blowing and washing effect.},
 year = {2022}
}

Copy | Download

TY  - JOUR
T1  - Analysis and Countermeasure of NH4HSO4 Deposition Area of Air Preheater Heat Transfer Element
AU  - Li Mingcheng
AU  - Li Qiang
AU  - Ren Yanhui
AU  - Zhang Mingzhao
AU  - Li Guipeng
AU  - Liu Yu
Y1  - 2022/07/29
PY  - 2022
N1  - https://doi.org/10.11648/j.ijepe.20221103.12
DO  - 10.11648/j.ijepe.20221103.12
T2  - International Journal of Energy and Power Engineering
JF  - International Journal of Energy and Power Engineering
JO  - International Journal of Energy and Power Engineering
SP  - 77
EP  - 82
PB  - Science Publishing Group
SN  - 2326-960X
UR  - https://doi.org/10.11648/j.ijepe.20221103.12
AB  - According to the area where the air preheater is blocked, from the perspective of the physical properties of NH4HSO4, analyzed the reason of NH4HSO4 blockage in air preheater heat storage element caused by SCR flue gas denitration in boiler. The deposition of NH4HSO4 and low temperature corrosion occur in specific areas of the air preheater, the area is restricted by the gas temperature and the metal wall temperature. When the height of the heat storage piece in the cold section of the air preheater is insufficient, the bonding area of NH4HSO4 will span the upper part of the low temperature section and the lower part of the middle temperature section (the two-stage arrangement is the high temperature section), there is the situation that the mid-temperature section cannot be blown through, and the NH4HSO4 deposition area expands upward at low load. Through the characteristic temperature of NH4HSO4, combined with the flue gas temperature and wall-temperature of heat transfer element of rotary air preheater at different heights, a partitioning judgment method for the deposition process of NH4HSO4 in the air preheater was proposed. To solve the clogging problem of air preheater, firstly, the deposition area of NH4HSO4 should be concentrated into the cold end heat storage element by raising the height of the heat storage plate in the cold section, so that the soot blower can be blown through and centralized washing is convenient; secondly, the cold wave type with closed channel is selected to improve the soot blowing and washing effect.
VL  - 11
IS  - 3
ER  -

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