Hello everyone! Next, we learn the type of combustion, there are two main types of combustion classification, the first is according to the characteristics of the moment of occurrence, combustion is divided into two types of fire and explosion, whether it is general combustion or violent combustion and the degree of explosion is not the same.
The second type of combustion is different, the three material forms presented in nature: solid, liquid and gas, so it is divided into three categories: solid combustion, liquid combustion, and gas combustion.
Among them, let's take a look at the detailed classification, for fire can be divided into two types: ignition and spontaneous combustion. For explosions, it is divided into physical explosions, such as balloon bursting, which is called physical explosions, which are caused by pressure changes. The second chemical explosion, which produces new substances, like some conventional fires or explosions, can see the sound of chemical explosions. The third is a nuclear explosion, such as the type of hydrogen bomb nuclear bomb, where the focus is on chemical explosions and fire related requirements.
The ignition process of solid combustibles. Then when the solid combustible is heated, it can suck out some combustible steam and pyrolysis products, a solid in combustion, the first to burn is not the solid itself, but when the solid is heated, it adsorbs some gases, or some particles, is a gaseous substance, this alternative substance will be mixed with the air, after the mixing is completed, it begins to produce combustion, and for liquids it is the same reason, when heated can evaporate some combustible steam, and this combustible steam it is also a gaseous substance, It will also burn when mixed with air, and the same is true for gas combustibles, where the gas is directly mixed with air and then burned. Gas combustion is very intense, much more intense than solid combustion, because gas combustion it mixes directly from the beginning.
What are the main factors that cause solid combustion?
The density of the first combustible, the second specific surface area, the third thickness. In terms of the density of combustibles, if the density is greater, the more difficult it is for the solids to ignite, and the smaller the density, the easier it is for the solids to ignite.
The specific surface area of the second combustible, the specific surface area is also the ratio of surface area to volume. The larger the specific surface area.
The finer the particles of this type of combustible substance, the finer the particles, and the more combustible gaseous substances absorbed by heat, so. The larger the specific surface area. The easier it is for solids to ignite.
Third, the thinner the thickness of the combustible, the easier it is to absorb, and the thicker the thickness, the less likely it is to absorb.