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الصحة والسلامة والانبعاثات

حد الاشتعال للخليط — لوشاتلييه

The lower and upper explosive limits of a multi-component gas, and where a measured atmosphere sits against them.

كل الأدوات

المدخلات

Volume percent of the gas stream present in air — what a detector sees before it is scaled to % LEL.

تركيب تيار الغاز

النتائج

يجري تحميل الحساب…

جرى هذا الحساب داخل متصفحك. لم يُرسل أي رقم أدخلته إلى أي جهة، ولم يُحفظ شيء.

كيف تُحسب

  • Le Chatelier: 1/LEL_mixture = Σ (yᵢ / LELᵢ), with the same form for the upper limit.
  • Mole fractions are normalised over the combustible components only, so inerts in the stream dilute the atmosphere rather than counting as zero-LEL fuel.
  • Component limits are from NFPA 497 at 25 °C and one atmosphere.
  • The measured atmosphere is expressed as a percentage of the mixture LEL, which is what a detector reads.

أين تتوقف عن الصحة

Le Chatelier is an approximation that holds well for alkane mixtures at ambient conditions and less well for anything else — hydrogen and hydrogen sulphide both depart from it. Temperature and pressure both widen the flammable range, and the published limits here are at 25 °C and one atmosphere; a hot vessel or a pressurised enclosure is a different problem. Nothing computed here substitutes for a calibrated detector, and a detector calibrated on methane does not read percent LEL correctly in a propane atmosphere. Entry decisions are made on instruments and a permit, never on arithmetic.

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