A Review of Flue Collapse in Thermal Power Plants after Denitrification
Abstract
This paper addresses the issue of flue collapse in thermal power plants after denitrification, analyzing from a professional technical
perspective the two main causes: First, improper control of ammonia injection during denitrification leads to ammonia slip, which reacts with
sulfur trioxide and water vapor in the flue gas to form highly adhesive ammonium bisulfate. This substance deposits on the surface of the air
preheater at low temperatures, causing blockages that alter the airflow distribution, reduce velocity, exacerbate ash accumulation, and increase
the risk of collapse. Second, air leakage on the flue gas side between the denitrification system and the air preheater leads to uneven airflow
and reduced velocity, further worsening ash accumulation. Based on a comprehensive review of literature, data, and on-site investigations, this
paper systematically demonstrates the above causes and proposes targeted preventive measures.
perspective the two main causes: First, improper control of ammonia injection during denitrification leads to ammonia slip, which reacts with
sulfur trioxide and water vapor in the flue gas to form highly adhesive ammonium bisulfate. This substance deposits on the surface of the air
preheater at low temperatures, causing blockages that alter the airflow distribution, reduce velocity, exacerbate ash accumulation, and increase
the risk of collapse. Second, air leakage on the flue gas side between the denitrification system and the air preheater leads to uneven airflow
and reduced velocity, further worsening ash accumulation. Based on a comprehensive review of literature, data, and on-site investigations, this
paper systematically demonstrates the above causes and proposes targeted preventive measures.
Keywords
Thermal power plant; Denitrification; Flue collapse; Ammonia slip; Ammonium bisulfate; Air preheater blockage; Flue gas side air
leakage
Full Text:
PDFReferences
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DOI: http://dx.doi.org/10.70711/itr.v3i1.8228
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