Combustible gases, also known as flammable gases, are gases that have the potential to ignite and burn in the presence of oxygen. These gases are widely used in industry, agriculture, and research fields for various purposes. Common combustible gases: such as natural gas, propane, hydrogen, methane, and butane etc.
(1).LPG is derived from petroleum processing or oil, natural gas extraction process, its main contents are propane, propylene, butane and butene. When the concentration of liquefied petroleum gas is higher in the air, it has an anesthetic effect on the human central nervous system, and if it is not burned, but it will produce toxic gases such as carbon monoxide. When liquefied petroleum gas * is burned, a large amount of air is needed to fuel it. 1 cubic meter of LPG * requires about 30 cubic meters of air to burn. Therefore, where gas appliances are used, air circulation must be maintained.
(2).Natural gas Natural gas is paleontological remains deposited underground for a long time, slowly transformed and metamorphic cracking and produced by gaseous hydrocarbons, with flammability, mostly in the oil field when the exploitation of crude oil. The proportion is 0.65, lighter than air, with colorless, tasteless, non-toxic characteristics, natural gas companies are in accordance with the government regulations to add odor agents, so that users smell. According to the state of natural gas reserves, it can be divided into structural natural gas, water-soluble natural gas and coal mine natural gas. Structural natural gas can be divided into wet natural gas associated with crude oil production and dry natural gas without liquid components. If a natural gas leak in the home is very dangerous, because too much methane in the air, although not toxic (natural gas is non-toxic), but easily cause suffocation. Fire can also cause explosions of varying sizes. Natural gas explosion limit: 5%-15%.
(3).Toluene, toxicity: low toxicity. Acute toxicity: LD505000mg/kg(rat oral); LC5012124mg/kg(rabbit transdermal); Human inhalation 71.4g/m3, short-term death; Human inhalation 3g/m3×1 ~ 8 hours, acute poisoning; When people inhale 0.2 ~ 0.3g/m3×8 hours, poisoning symptoms appear.
Biogas is a flammable gas produced by organic matter under the condition of isolating air and certain temperature, humidity, pH, etc., through the action of biogas bacteria. Because this gas was first found in swamps, it is called biogas. The main components of biogas are CH4, the rest are CO2, O2, N2 and H2S. The CH4 content is about 55% to 70%, and the CO2 content is about 30% to 45%. Methane is a mixture of gases.
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