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Why is the flame of the gas stove blue and yellow?

Author: source: Date: 2017-11-23

Gas flame

In fact, this is mainly due to the composition of the natural gas entering the gas stove. There are three kinds of fuels that can be used for cooking at home: gas, natural gas, and liquefied petroleum gas. Generally speaking, the composition of gas is carbon monoxide; natural gas is methane; liquefied petroleum gas is propane and butane. Although their composition is different, after full combustion, they will show a blue flame.

Take gas as an example. After the main components of carbon monoxide and oxygen in the air are fully burned under ignition conditions, carbon dioxide will be generated, and the flames appearing during the reaction will appear blue. If the flames in the gas stove at home are all blue, it means that the gas is very pure and burns very well. But you must find out carefully that sometimes the outer part of the blue flame will show some yellow, and the bottom of the pot will be blackened. What's the matter?

In fact, this is because the gas is not fully burned, and there are several situations that can change the flame of the gas stove from blue to yellow. It may be because the gas itself contains impurities, and the flame when the impurities burn will be yellow; it may be because the tuyere is too tight, causing too little air to enter the stove, and the gas cannot be fully burned, and the flame will turn yellow; It is because there is too much sundries on the stove, and it is mixed in when the gas is burned. At this time, the gas stove needs to be cleaned in time; there may also be too little gas left in the gas tank, but the The increase in air makes it difficult to fully burn.

In short, if the gas is fully burned, then a blue flame should appear, and if it is not fully burned, a yellow flame will appear. The same is true for natural gas and petroleum liquefied gas.

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