What is the function of combustible gas detector?
Combustible gas is a state of combustible substances. It refers to a gas that can be uniformly mixed with air or oxygen within a certain concentration range to form a premixed gas. It will explode when encountering a fire source, and release a lot of energy during the combustion process.
Combustible gas is the most dangerous gas encountered in petrochemical and other industrial occasions. It is mainly organic gases such as alkanes and some inorganic gases, such as carbon monoxide, methane, biogas, hydrogen, etc., so what is the function of combustible gas detectors? Next, let's take a look with the editor of Honey Iger!
There must be certain conditions for the explosion of combustible gas, that is, a certain concentration of combustible gas, a certain amount of oxygen, and an ignition source with enough heat to ignite them. These are the three elements of blasting, and one is indispensable. Neither condition can cause fire and explosion.
When the combustible gas and oxygen are mixed and reach a certain concentration, they will explode when they encounter a fire source with a certain temperature. We call the concentration of the combustible gas that explodes when it encounters a fire source as the blasting concentration limit, referred to as the blasting limit, which is generally expressed in %. In fact, this kind of mixture does not explode at any mixing ratio but has a concentration range.
Relevant authoritative departments and experts have analyzed the combustion and explosion of the combustible gas found now, and have drawn up the explosion limit of combustible gas, which is divided into upper explosion limit (abbreviated as UEL in English) and lower explosion limit (lower explosion limit in English). abbreviation LEL).
Below the lower limit of explosion, the content of combustible gas in the mixture is insufficient, which cannot cause combustion or explosion; above the upper limit, the content of oxygen in the mixture is insufficient, and cannot cause combustion or explosion. Combustion and explosion of other combustible gases are also related to Gas pressure, temperature, combustion energy and other factors are related, and the explosion limit is generally indicated by volume percentage concentration.
Explosive limit is the general name of explosive lower limit and upper explosive limit. Only when the concentration of combustible gas in the air is between the lower explosive limit and the upper limit of explosion will explosion occur. During explosion measurement, the alarm concentration is generally set below 25%LEL of the lower explosion limit.
Therefore, when the combustible gas alarm alarms, you don't have to worry about whether there is danger. At this moment, it is reminding you to take corresponding measures immediately, such as blocking the valve or turning on the electric fan.
