What does the internal structure of a flame look like? How can I change the characteristics of the f

Flame composition. It is generally divided into three parts.

Inner layer. The dark blue flame, due to insufficient oxygen supply, incomplete combustion, the lowest temperature, has a reducing effect. Called the flame center or reducing the flame.

Mesosphere. Deep red or light yellow flame, bright. The temperature is higher than the inner layer. Called the Inner Flame.

Outer layer. Colorless, due to sufficient oxygen supply, complete combustion, the highest temperature, and oxidation. It is called the outer flame or oxidizing flame.

Or it can be divided into flame center, inner flame and outer flame, and the flame temperature increases sequentially from the inside to the outside.

Flame Heart. The dark and blue parts in the center are made up of gases that can burn but are not yet burning.

Inner Flame. The brightest part that surrounds the center of the flame is the part where the gas is not completely burned. It contains carbon particles, is heated to emit strong light, and has a reducing effect, also known as a reducing flame.

Outer Flame. The outermost yellowish or transparent area is called the reaction zone. It is the part where the gas burns completely. It contains an excessive amount of hot air, which has an oxidizing effect, also known as an oxidation flame.

I thought about this question before, and then I was lucky enough to get a more scientific answer.

First of all, the flame is not the rising air itself that glows because of the heat. A flame is an area of the air that is undergoing a chemical reaction, burning.

Note that the combustion I am talking about here is the reaction between oxygen in the air and combustible gases. A flame is when two invisible gases react with each other. Why, you may ask, do we see?

That's because oxygen doesn't flow in fast enough to react with combustible steam.

Therefore, some of the combustibles are still tiny particles that are not burned, and they emit light due to the heat and are swept upwards by the hot air current. When the group of hot, shiny particles rises higher, oxygen enters through their extensions, burning the whole particle away into invisible gas.

Body. (Carbon dioxide in life) so the higher you go, the less it is not burned, and the upper end of the flame will become smaller and smaller (commonly known as flames).

From the above, it should be seen that the flame we see is actually a small particle of combustible material that has not yet been completely burned.

It's hot enough, though

The effect of the gas flow rate in the rotary kiln on the flame length is that the faster the flow rate, the longer the flame, and the gas flow rate is affected by the primary wind speed and the exhaust air at the end of the rotary kiln. On the one hand, the addition of a wind speed can improve the useful range of pulverized coal and lengthen the flame; On the other hand, it makes the air coal mix evenly, so that the incineration speed is fast and the flame is short, which are two opposite effects. At the same time, in order to avoid "tempering", the ejection velocity should be greater than the flame diffusion velocity.

The ejection velocity is related to the diameter of the rotary kiln, the large diameter of the rotary kiln requires a higher ejection velocity, and the smaller diameter of the kiln takes a small value, so that good conditions can be created for the heat exchange between the flame and the material. The exhaust air at the end of the rotary kiln is added to add the negative pressure at the tail of the rotary kiln, and the secondary air is added to add the gas flow rate outside the flame, so as to elongate the flame.