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  3. Energy / Power Generation

broeiontwikkeling

22:23 Oct 16, 2014
This question was closed without grading. Reason: Other

Dutch to English translations [PRO]
Science - Energy / Power Generation
Dutch term or phrase: broeiontwikkeling
Right, so my question is more about the sentence surrounding this term, really. This is about coal storage. The speaker states that compaction of coal stockpiles *slows down* the "broeiontwikkeling", so the coal can be stored longer.

I'm a little confused by his choice of verb, which suggests that the coal heating up is inevitable, even if it is compacted. It was my understanding that as long as oxygen is removed from the equation, it can be safely stored and this does not happen. The way the speaker puts it suggests it's only really 'buying time'. It might be because it's an impromptu, spoken explanation (rather than a written text) that his explanation is confusing me. Am I overthinking things, or am I missing something here?
Emma Rault (X)
United Kingdom
Local time: 03:22


Summary of answers provided
4Development of secondary fermentation
Mele Coronat (X)
Summary of reference entries provided
Wiard Sterk

  

Answers


13 days   confidence: Answerer confidence 4/5Answerer confidence 4/5
Development of secondary fermentation


Explanation:
Secondary fermentation is a process which can occur but whether or not it will happen apparently is very difficult to predict. An ignition risk with coal storage appears to be increased where organic substances are present in the coal and sufficient moisture is around, too.

Attached is a document in Dutch, published by the fire fighter brigade. It offers a clear explanation. I posted extracts of that in English at the reference part right here below.

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Note added at 13 days (2014-10-30 21:33:33 GMT)
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Secondary fermentation is a process in which by formation of mould, bacteria or in combination with oxygen and an organic material, heat is produced. Depending on the product, this is a process that happens is more or less rapidly. For forcing several factors are needed. One such factor is the presence of organic substances in the storage. This can be large amounts of coal or wood chips, as well as bulk storage of contaminated plastic containing are organic rest particles.

Also, the moisture percentage of the storage is a key factor for the development of heating. If the product contains more than 15% moisture, there is a risk of scalding. In combination with oxygen, there can arise a biological process, whereby the heat in the organic material can not escape. As a result, the temperature rises.
The scalding process can be divided into two stages, biological and chemical heating.
Micro organisms create a heat which can amount to 60-70 degrees Celsius.

The micro-organisms will, if the temperature rises further, die. At that point there are two possibilities. In most cases, the temperature will stabilize and even decrease. In some cases, however, chemical forcing occurs. Carbon is converted into carbon dioxide and as a result, the temperature can quickly rise above 100 degrees Celsius and will evaporate the moisture. Once no moisture is present in the biomass, the temperature will continue to rise until the point is reached that the product ignites spontaneously. Prediction of secondary fermentation is not possible, because each product behaves differently.

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Note added at 13 days (2014-10-30 21:38:47 GMT)
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Just found out that it is impossible for a user to correct her own text after having published it - a bit unhelpful. But so be it: In this sentence above, in your mind while reading please be so kind and detract the 2nd <is> so that it says:
"Depending on the product, this is a process that happens more or less rapidly."

Thanks!


    Reference: http://www.brandweerkennisnet.nl/publish/pages/3861/eindrapp...
Mele Coronat (X)
Netherlands
Local time: 04:22
Specializes in field
Native speaker of: Native in GermanGerman
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Reference comments


11 hrs
Reference

Reference information:
The compaction will prevent oxygen contact to a large extend, but not entirely. Not sure if you are looking for an explanation of the process or that you are questioning the reasoning and expertise of the presenter? Or are you looking for a translation of "broeiontwikkeling"?

Wiard Sterk
United Kingdom
Native speaker of: Native in DutchDutch, Native in EnglishEnglish
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