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Research Papers: Gas Turbines: Industrial & Cogeneration

Analytical Study of the Effects of the Clogging of a Mechanical Precipitator Unit in Air Preheaters in a High-Performance Thermoelectric Power Plant Based on Available Data

[+] Author and Article Information
J. M. Blanco1

Departamento de Máquinas y Motores Térmicos, Escuela Técnica Superior de Ingeniería, Universidad del País Vasco∕E.H.U, Alameda de Urquijo s∕n (48013) Bilbao, España

F. Peña

Departamento de Máquinas y Motores Térmicos, Escuela Técnica Superior de Ingeniería, Universidad del País Vasco∕E.H.U, Alameda de Urquijo s∕n (48013) Bilbao, Españajesusmaria.blanco@ehu.es

1

Corresponding author.

J. Eng. Gas Turbines Power 130(2), 022001 (Jan 22, 2008) (7 pages) doi:10.1115/1.2795771 History: Received July 05, 2006; Revised July 20, 2007; Published January 22, 2008

Following a detailed study of two of the mechanical precipitators in the air preheaters of a thermoelectric power plant, a large amount of ash that was deposited on one of the inlet conduits was observed, obstructing the incoming gas flow. A comparison of the available data for the two most recent hopper cleaning operations revealed that, on the one hand, the amount of ash collected by the clogged precipitator (A) was significantly less than that collected by the other (B) and, on the other hand, the temperature of the ash in the former was noticeably lower than in the latter. Prior to the cleaning of the conduits, a certain amount of damage was caused to the boiler dome, which meant that subsequent cleaning required the use of a hydrolazer, where it was noted that inlet pressures were very high. All of this indicated that the cause of the clogging was not physical. This paper provides a comprehensive analytical analysis that explains what happened, as well as resolving the situation.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Simplified layout of the air heaters and MPs in the power plant of reference

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Figure 2

Description an air heater type “Ljungstrom” (ALSTOM Power Inc. Air Preheater Company)

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Figure 3

A two step description of the clogging process for LAP A

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Figure 4

Historical description of inlet and outlet pressure changes through LAPs A and B.

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Figure 5

Decreasing of the time dependent theoretical temperature field over the metallic baskets

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Figure 6

Time dependent empirical surface temperature field over the metallic baskets

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