How to choose reasonable combustion method for muffle furnace

How should we choose a reasonable combustion method in the experiment?

1. High enough furnace temperature
Temperature is the primary condition for fuel combustion. The minimum temperature at which the fuel begins to undergo a violent oxidation reaction is called the ignition temperature. The heat required to heat the fuel above the ignition temperature is called a heat source. The heat source of fuel ignition in combustion chamber usually comes from heat radiation of flame and furnace wall and contact with high temperature flue gas. How to choose a furnace composed of heat sources? The temperature of the furnace must be kept above the ignition temperature of the fuel. That is to say, the temperature of the furnace must be high enough for continuous combustion of the fuel. Otherwise, the fuel will be difficult to ignite, unable to burn, or even cut off.

2. Choose reasonable combustion method and proper amount of air
Fuel must be fully contacted and mixed with enough gas in air when burning. When the furnace temperature is high enough, the combustion reaction speed is very fast, and the oxygen in the air will be consumed quickly. Therefore, sufficient air must be supplied. However, in actual operation, the air sent into the furnace is surplus, but the excess air quantity cannot be too much, so it should be appropriate to avoid reducing the furnace temperature.

3. Sufficient combustion space
Combustible materials or fine coal chips volatilized from the fuel will burn while the flue gas flows. If the furnace space (volume) is too small, the flue gas flows too fast and the flue gas stays in the furnace for too short, the combustible materials and coal chips can not be fully burned. Especially when the combustible materials (combustible gas, oil droplets) touch the heating surface of the boiler before the complete combustion, the combustible materials are cooled below the ignition temperature and can not be completely burned, forming carbon nodules. At the same time, sufficient combustion space is ensured, which is conducive to the full contact and mixing of air and combustible materials, so that the combustible materials can be fully burned.

4. Enough time
It takes a certain period of time for the fuel not to ignite until it is completely burned out, especially for the layer combustion furnace. The larger the combustion particles, the longer the combustion time. If the combustion time is not enough,

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