With gas boilers, the issue lies in the concentration of natural gas during combustion
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As the title suggests, what is the typical concentration of natural gas during the combustion process in gas boilers? The excess air coefficient is 1.15; I calculated it to be 8%, which falls within the explosive range. There must be an error in my method, so I’m seeking help! Thank you
One molecule of methane requires two molecules of oxygen to burn completely. Oxygen makes up 20% of air; therefore, one volume of fuel needs 10 volumes of air. With a excess factor of 1.15, this amounts to 11.5 volumes of air. The concentration is 1 divided by 12.5. . . . It turns out to be eight percent.
Is the poster overthinking things? The natural gas that burns continuously enters the burner through the blower and then is ejected from the burner, where it catches fire; there is no process of mixing with air
That’s right; if it’s mixed in advance, it will explode! ! It is natural gas that is ejected from the nozzle and burns upon coming into contact with air; the air excess factor is primarily used to control thermal efficiency. It has nothing to do with things like the explosion limit, unless you want to mix the gases first and then induce an explosion.