Calculating Lower Explosive Limit (LEL) for Gas Mixture

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In summary, it is possible to calculate the lower explosive limit (LEL) for a gas composition if you have the LEL for each individual component, but it is more accurate to determine experimentally. This can be done by examining the part pressures of each component gas and assuming the lowest LEL will ignite the rest. However, this may not always be accurate due to complicated reaction kinetics. Alternatively, seeking guidance from a moderator in a chemistry forum may also be helpful.
  • #1
rppearso
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Can the lower explosive limit (LEL) be calculated for a gas composition if you have each components LEL but not the mixtures LEL? Or does this need to be determined experementially?
 
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  • #2
Good bloody question.

I don't know.

Easy answer would be to determine experimentally. I would imagine the difficult answer involves looking at the part pressures of each individual component gas in the mixture to give you an air/fuel ratio for each component, and assuming that the component with the lowest LEL will ignite the rest (though reaction kinetics being complicated as they are, I doubt this would be correct!).

I don't know. Perhaps asking a mod nicely to move this to the chemistry house would be more useful?
 
  • #3
Section 2.3 of http://www.pnl.gov/main/publications/external/technical_reports/PNNL-13933Rev1.pdf" and references therein.
 
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What is the Lower Explosive Limit (LEL) for gas mixture?

The Lower Explosive Limit (LEL) for gas mixture is the lowest concentration of a combustible gas in air that can produce a flame when ignited. It is expressed as a percentage of the gas concentration in air by volume.

Why is it important to calculate the LEL for gas mixture?

Calculating the LEL for gas mixture is important for safety reasons. It helps determine the level at which a gas mixture can become explosive and potentially cause harm to individuals or property. It is also important for industrial and manufacturing processes where the presence of combustible gases must be carefully monitored and controlled.

What factors determine the LEL for gas mixture?

The LEL for gas mixture is influenced by several factors, including the type and concentration of gases present, the temperature and pressure of the environment, and the presence of any inert gases that may dilute the combustible gases.

How is the LEL for gas mixture calculated?

The LEL for gas mixture is typically calculated using the ideal gas law, which takes into account the volume, temperature, and pressure of the gas mixture. It is also important to consider the individual LEL values for each gas present in the mixture and calculate the overall LEL based on their concentrations.

Can the LEL for gas mixture change over time?

Yes, the LEL for gas mixture can change over time due to various factors such as changes in temperature, pressure, or gas concentrations. Therefore, it is important to regularly monitor and recalculate the LEL for gas mixtures to ensure safety and proper control measures are in place.

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