After gas enters the burner, it needs to mix with a certain proportion of air, and then fully burn, including two parts of heat, one part is the physical heat brought by gas and air. In simple terms, it is the heat it carries, and more generally it has a certain temperature; The other is heat from chemical reactions; The two parts of heat together determine the temperature of the flame.
The flame temperature of the burner seems to be easy to calculate, but it does not solve this problem, because the premise of this calculation is that the combustion process is carried out in a hot state, that is, both kinds of heat are used for the flame itself. This temperature engineering is called the calorimeter temperature, and the actual temperature is definitely not this temperature.
Generally speaking, the theoretical combustion temperature increases with the heating value of gas. When there are more heavy hydrocarbons in gas, the calorific value is higher and the theoretical combustion temperature is also higher. However, the phenomenon that the combustion temperature of low calorific value combustion is higher than that of high calorific value gas cannot be ruled out.
In addition, the excess air coefficient has a great influence on the flame temperature. The excess air coefficient is too small, the combustion is insufficient, the combustion heat loss is large, the theoretical temperature decreases; In any case, if the air coefficient is too large, the corresponding increase in combustion products will decrease the theoretical temperature, and this factor has been explained in theory.
The flame temperature is also related to the preheated air, the temperature increases, the enthalpy increases, the theoretical temperature increases.
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