how to cal heat loss due to low excess air in coal burner
how to cal heat loss due to low excess air in coal burner
(OP)
I work at a cement plant where we have 2 rotary kiln. From several projects I’ve noticed that the excess air within in the kiln was low. I know from college that this lowers the flame’s temperature. Currently we don’t have a way to accurately measure the temperature. However it’s vital to get some type of indication of how the flame is being affected. plese help
Thanks
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RE: how to cal heat loss due to low excess air in coal burner
xs air,% adiab. temp., oC
0 2,000
20 1,800
40 1,640
60 1,480
80 1,360
100 1,250
In practice, these temperatures aren't attainable because of the immediate flame heat release "in status nascendi" by radiation.
If we assume that this "loss" is, say 35%, the above temperatures would come down to something as 1,450, 1,265, 1,140, 1,010, 920, and 850oC, respectively.
Higher flame heat "losses", of around 50%, can be attained in refinery furnaces by preheating the air to combustion and having a low % of xs air which, as we saw, affects the flame temperature, and thus the flame radiation heat flux.
RE: how to cal heat loss due to low excess air in coal burner