Kyushu space explains the basics of flammable gases

Basic knowledge of flammable gases

Flammable gases are harmful gases that may be encountered at any time in the petrochemical, chemical, and coal mining industries. The most common combustible gas is an alkane gas, such as methane (gas), propane, etc. Of course, other organic and inorganic gases such as benzene, carbon monoxide, ammonia, etc., can also be called a kind of combustible gas within a certain concentration range. However, because they are also very toxic at the same time, they will pose a hazard to the health and life of field workers before their concentrations reach the explosion limit. Therefore, we regard these gases as toxic gases rather than simply as A flammable gas detector is used for detection. For example, the gas that is often used in urban life is mainly composed of carbon monoxide. If it is only from the heating point of view, it is a flammable gas that is uncompromising, but carbon monoxide accumulates in the air to a very small concentration (such as 1000ppm). It is enough to cause death after a thousandth of the volume concentration. At this time, it is not enough to consider carbon monoxide as a combustible gas, because once carbon monoxide leaks in the environment, before there is no explosion. There is a danger of poisoning, such as gas poisoning.

According to China's GBJ16-87 and GB50160-92 regulations, carbon monoxide is a class B gas. Because the difference between the lower limit of the explosion and the upper limit is greater than 20%, the risk is greater. According to foreign regulations, it belongs to Class A gas, and because carbon monoxide gas is colorless and odorless, it will not cause people to be vigilant. Inhalation of higher concentration will cause acute cerebral hypoxia and damage the central nervous system of the human body. According to the international TJ36-79 regulations, carbon monoxide is a hazardous substance in the workshop air. According to the national standard GB5044-83, carbon monoxide is a Class II toxic hazard. Therefore, according to this specification, carbon monoxide will be detected as a toxic gas.

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