Which is more explosive: methanol, gasoline, liquefied gas, or kerosene?
Thread Content
The table below shows that, in terms of the minimum ignition limit, the order from lowest to highest is: 1. kerosene, 2. gasoline, 3. liquefied gas, 4. methanol. As for the ignition temperature, the order from lowest to highest is kerosene, gasoline, methanol, liquefied gas, and natural gas; therefore, methanol is safer than gasoline and liquefied gas. Minimum explosive limit (LFL/LEL) % by volume of air; Maximum explosive limit (UFL/UEL) % by volume of air; Flash point; Autoignition temperature: Gasoline (100 octane rating): 1.47, 7.6; < –40°C (–40°F); 280°C. Methanol: 6–6.7, 3611°C; 455°C. Methane (natural gas): 4.4–5, 15–17. Combustible gases: 580°C. Kerosene: 0.6–0.7, 4.9–5; >38°C (100°F); 210°C. Liquefied gas: 1.5, 9.5, 470°C℃
Flammable substances (flammable gases, vapors, and dusts) must be uniformly mixed with air (or oxygen) within a certain concentration range to form a premixed gas; only when this mixture comes into contact with a fire source will an explosion occur. This concentration range is known as the explosion limit, or explosive concentration limit. The lowest and highest concentrations at which a flammable mixture can explode are referred to as the lower explosive limit and the upper explosive limit, respectively; these are sometimes also called the lower ignition limit and the upper ignition limit. It does not explode or catch fire when the temperature is below the explosion threshold ； It will not explode when the temperature is above the explosion limit, but it can burn. The greater the range of the explosive limit for a flammable mixture, the lower the lower explosive limit, and the higher the upper explosive limit, the greater its explosive hazard. This is because the wider the explosion limit, the greater the chances of conditions for an explosion occurring ； The lower the explosion threshold, the more likely it is that even a slight leakage of flammable substances will create conditions for an explosion ； The higher the explosion limit, the more air can penetrate into the container, where it can mix with the flammable substances inside to create conditions for an explosion. It should be noted that when the concentration of a flammable mixture exceeds the upper limit for explosion, no ignition or explosion occurs; however, if it escapes from a container or pipeline and comes into contact with air again, it can burn, and there is still a risk of fire.
Methanol is still the most prone to explosion.
Gasoline (100 octane rating) 1.4 7.6 < −40℃ (−40°F) 280 Gasoline
Watch the limits of zha explode, gasoline.
Based on a comprehensive evaluation of the explosion limit range and flash point, methanol seems to have a relatively high explosiveness! ! !
It depends on the flash point and explosion limit range; it should be gasoline
It also depends on the actual state of the different substances; gases are certainly more prone to explosion than liquids. For gases, the explosion limit and relative density are important factors, while for liquids, the flash point is relevant. The comprehensive ranking is as follows: LPG › Natural gas › Gasoline › Methanol › Kerosene
It’s just an empirical understanding – I think liquefied gas is more likely to explode, because it is in gaseous form at normal temperature and pressure.