Today we move on to the third module in the book Fire Facility Operator Basics: The Basics of Combustion and Fire.
First, let's take a look at the mind map of this module. Then the basic knowledge of combustion and fire mainly talks about 4 parts, the first of which is the basic knowledge of combustion. The second is the definition and classification of fire, and the third is the development and occurrence process of building fire. The fourth is the basic principle of fire prevention and fire extinguishing,
You can divide into two key points to remember, the first focus is the basic knowledge of combustion, talking about combustion, the second focus is on the basic knowledge of fire, talking about the definition of fire, the development of building fire, and how we extinguish fire and fire prevention.
Let's first take a look at the basics of combustion, which contains 5 contents, one is combustion, and the other is how to classify combustion? The third is some products of combustion, and the fourth is the path of flue gas spread and a damage caused by smoke to people. The fifth is to understand how the flame is formed, and what is the concept of combustion heat and other related knowledge concepts.
The definition of combustion refers to the exothermic reaction between combustibles and oxidants, and it is noted here that it is an exothermic reaction and the joint action of combustibles and oxidants can usually be accompanied by flame luminescence and fire smoke, that is to say, when combustion occurs, it is possible to emit flue gas, or it is possible not to produce flue gas.
A difference between smoke and fog. When the water boils, there will be a layer of fog on the kettle, then it is composed of water vapor, it is fog, and the smoke is generally a tiny particle, a damage caused to the human body.
The conditions for combustion are mainly divided into two categories, one refers to the necessary conditions for combustion and the sufficient conditions for combustion, so how to understand the necessary and sufficient? As the name suggests, what are the necessary conditions for combustion to occur? And what conditions should be in place for continuous combustion, not a momentary combustion?
The three elements of flameless combustion are combustibles, combustibles, and ignition sources, and for flame combustion, it is not only combustibles, combustion aids, and ignition sources, but also has an additional chain reaction.
How to understand this chain reaction? When one molecule of a substance is burned, it causes the two molecules around it to burn as well, and then pass it down in turn.
The second is the full conditions for combustion, since the combustion is to continue for a period of time to fully occur, a certain amount of combustibles, a certain amount of combustibles, that is to say, oxygen should be sufficient, combustibles should be sufficient, and a certain amount of energy sources are needed.
Well, let's sum up, the three elements of the necessary conditions for combustion, combustibles, combustion aids, ignition sources and a four-element, combustibles, combustion aids, ignition sources and a chain reaction, at the same time in the combustion can be called oxidants, we must focus on these two points to master.