Under the same heat load, does the furnace temperature rise higher when burning natural gas compared to burning fuel oil?
Thread Content
Some experienced workers say that, for the same amount of processing, the furnace temperature is higher when using fuel gas compared to when using fuel oil. Is this true? What principle?
Maybe, after all, it fits as well – different fuels result in different amounts of flue gas and different temperatures as well
I want to know why too. Does anyone know?
You can check the calorific value for this; the calorific value of natural gas is quite high
It only indicates that the calorific value of the feed gas is higher than that of the feed oil. Calorific value: The heat released when a unit mass (or volume) of fuel burns completely. There is a relationship between heat and temperature as follows: W=CM(To－T) (C: specific heat of the object being heated; M: mass of the object being heated; T: initial temperature of the object; To: final temperature of the object). For the same processing amount, it indicates that C, M, and T are all the same; To is only related to heat. But the condition is the same processing volume, that is, the same fuel quality; therefore, in this case, it is the calorific value that determines the size of To. In other words, at the same processing volume, the higher the calorific value of that fuel, the higher the final temperature of the object being heated.
It’s not the right point; my question is: when T and To are the same, why does the temperature inside the furnace differ if the fuel is different?
Heat transfer in a radiation chamber includes radiative heat transfer and convective heat transfer, but radiative heat transfer accounts for a large proportion, while convective heat transfer accounts for a small one. Radiative heat transfer depends on solid particles, triatomic gases (carbon dioxide, water vapor), asymmetric diatomic gases (carbon monoxide), and polyatomic gases ； Symmetric diatomic gases (oxygen, nitrogen) do not have the ability to radiate. The main factors at play are solid particles and triatomic gases (carbon dioxide, water vapor), with solid particles having a greater radiative capacity than triatomic gases. Liquid fuels tend to produce more solid particles than gas fuels. In other words, the radiation capacity of the flame from liquid fuel is greater than that of gas fuel. However, as the operating time increases, the combustion of liquid fuel tends to produce more fouling, and the heat transfer efficiency of the entire heating furnace gradually declines.