Freezing of coal in the underground storage of a power plant

J. Sipilä (Corresponding Author), Pertti Auerkari, Stefan Holmström, J. Itkonen, K. Aaltonen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

A coal freezing incident in the underground coal storage of the Salmisaari power plant in Helsinki represents a unique risk factor in terms of the contributing mechanisms. Filling with subzero temperature coal in winter froze silo drains with seepage water, resulting in its leakage into the silo to form large lumps of icy coal that blocked the fuel discharge system. Compared to any previous experience with freezing of coal in transport or storage, including closed storage silos, the unexpected direction of heat transfer from storage wall to coal means an additional challenge in its mitigation, for example, by application of freeze conditioning agents. To assess the accompanying risk and options, the strength of the frozen coal has been modelled from the expected behaviour bounded by the extremes of moisture content. Based on this strength model and realistic distributions of the input variables, a Monte Carlo analysis has been used to assess the expected strength of frozen coal under the local winter climatic conditions. The results suggest that the strength of frozen coal in the discharge hoppers is typically strong to render immediate remedial action tedious and thus explain the challenge to the plant operation.
Original languageEnglish
Pages (from-to)38-42
Number of pages4
JournalCold Regions Science and Technology
Volume79-80
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

underground storage
Freezing
freezing
power plant
Power plants
Coal
coal
Coal storage
Hoppers
Monte Carlo analysis
Leakage (fluid)
Seepage
winter
risk factor
conditioning
drain
leakage
Moisture
heat transfer
moisture content

Keywords

  • Coal
  • freezing
  • ice
  • silo
  • strength model
  • underground storage

Cite this

Sipilä, J. ; Auerkari, Pertti ; Holmström, Stefan ; Itkonen, J. ; Aaltonen, K. / Freezing of coal in the underground storage of a power plant. In: Cold Regions Science and Technology. 2012 ; Vol. 79-80. pp. 38-42.
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abstract = "A coal freezing incident in the underground coal storage of the Salmisaari power plant in Helsinki represents a unique risk factor in terms of the contributing mechanisms. Filling with subzero temperature coal in winter froze silo drains with seepage water, resulting in its leakage into the silo to form large lumps of icy coal that blocked the fuel discharge system. Compared to any previous experience with freezing of coal in transport or storage, including closed storage silos, the unexpected direction of heat transfer from storage wall to coal means an additional challenge in its mitigation, for example, by application of freeze conditioning agents. To assess the accompanying risk and options, the strength of the frozen coal has been modelled from the expected behaviour bounded by the extremes of moisture content. Based on this strength model and realistic distributions of the input variables, a Monte Carlo analysis has been used to assess the expected strength of frozen coal under the local winter climatic conditions. The results suggest that the strength of frozen coal in the discharge hoppers is typically strong to render immediate remedial action tedious and thus explain the challenge to the plant operation.",
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Freezing of coal in the underground storage of a power plant. / Sipilä, J. (Corresponding Author); Auerkari, Pertti; Holmström, Stefan; Itkonen, J.; Aaltonen, K.

In: Cold Regions Science and Technology, Vol. 79-80, 2012, p. 38-42.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Freezing of coal in the underground storage of a power plant

AU - Sipilä, J.

AU - Auerkari, Pertti

AU - Holmström, Stefan

AU - Itkonen, J.

AU - Aaltonen, K.

PY - 2012

Y1 - 2012

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AB - A coal freezing incident in the underground coal storage of the Salmisaari power plant in Helsinki represents a unique risk factor in terms of the contributing mechanisms. Filling with subzero temperature coal in winter froze silo drains with seepage water, resulting in its leakage into the silo to form large lumps of icy coal that blocked the fuel discharge system. Compared to any previous experience with freezing of coal in transport or storage, including closed storage silos, the unexpected direction of heat transfer from storage wall to coal means an additional challenge in its mitigation, for example, by application of freeze conditioning agents. To assess the accompanying risk and options, the strength of the frozen coal has been modelled from the expected behaviour bounded by the extremes of moisture content. Based on this strength model and realistic distributions of the input variables, a Monte Carlo analysis has been used to assess the expected strength of frozen coal under the local winter climatic conditions. The results suggest that the strength of frozen coal in the discharge hoppers is typically strong to render immediate remedial action tedious and thus explain the challenge to the plant operation.

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