Based on the explosion limit, how is the limit concentration calculated?
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Assuming that the lower explosion limit for the mixed gas is 1.2%, with a molecular weight of 100 g/mol and an air flow rate of 100,000 NCMH, the concentration under standard conditions can be calculated as follows: 1.2% * 100,000 / 22.4 * 100 / 100,000 = 53.4 mg/m3. This value is clearly not realistic; in typical RTO systems, the concentration can reach 10 g/m3, which is still within a safe range.
What is NCMH? Isn’t the normal air volume expressed in cubic meters per hour, Nm3/h? 10 g/m3 converts to a volume percentage of 0.224%, and this concentration is not within the lower limit for explosion. Moreover, being within the explosive range does not necessarily mean that an accident will occur; an accident happens only when all three elements related to safety are present simultaneously. Generally, we consider 25% of the lower explosion limit to be safe
Your unit is incorrect; the calculated value should be 53.4 g/m3
What does his formula mean? Add 5 wealth again?