Organic sulfides and hydrogen sulfide (H2S) are common impurities that must be removed beforehand in most natural gas applications. Natural gas containing more sulfur impurities is described in the English terminology as "sour". Although natural gas is colorless and odorless, thiol is used to add odor to natural gas before it is sent to the end user to aid in leak detection. Natural gas is not as toxic as carbon monoxide, and it is essentially harmless to humans. However, if natural gas is in a high concentration state and the oxygen in the air is not enough to sustain life, it will still cause death. Natural gas cannot be used for human breathing. So when the methane concentration is too high, wear the self-rescuer in time and leave the mine. As a fuel, natural gas can also cause casualties due to an explosion. Although natural gas is lighter than air and easily diverges, when natural gas is concentrated in a closed environment such as a house or tent, when a certain proportion is reached, a powerful explosion is triggered. The explosion may squash the entire house and even the adjacent buildings. The lower limit of the explosion limit of methane in air is 5% and the upper limit is 15%.
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Main components of gas
General life often said natural gas, coal mine gas refers to a gas. Is an alkane-based hydrocarbon dry gas, of which methane is the majority, with a small amount of ethane, propane and butane, which has 75% carbon and 25% hydrogen in the dry gas. Some non-hydrocarbon gases, such as ammonia, carbon dioxide , carbon monoxide and hydrogen sulfide . In the standard state, methane to butane in gas is present in a gaseous state, and pentane or more is a liquid. Gas is a flammable and explosive gas because it contains the most methane and is 0.6 times lighter than air. In the event of an open fire, it can be burned, and a "gas" explosion will directly threaten the life safety of the miners. The biogas produced when some organic matter is decomposed in the absence of oxygen is actually methane. It may also contain some heavier hydrocarbon molecules such as ethane (C2H6), propane (C3H8) and butane (C4H10), as well as some non-quantitative sulfur containing gases.