UEi EagleX Spécifications télécharger pdf (Page 13)

1 . 8 0 0 . 5 4 7 . 5 7 4 0 • W W W . U E i T E S T . C O M

EAR

DEAL

OMBUSTION

When we burn pure

hydrogen in the air. Our atmos-

phere is 20.9% oxygen with the

remaining 79.1% nitrogen.

This is nearly as desirable as the

example for ideal combustion

with the only added loss being

the heat that is carried away from

your target with the nitrogen.

Because nitrogen isn’t part of the

combustion process, it enters the

combustion chamber at the inlet

temperature and leaves with some

of the heat created by the com-

bustion. If this isn’t recovered at

the heat exchanger it is lost up

the flue.

The main problem with this

example is again the availability

and cost of pure hydrogen.

EST

EA L

ORL D

Natural gas is a re a d i l y

a v ailable fuel, and our atmosphere

contains sufficient oxygen. W h e n

this is used as a fuel we get the

reaction; shown in figure 3.

Now the other added by - p ro d u c t s

a r e CO2 and hot nitrogen com-

p a r ed to the Ideal World situation.

In addition to this we have added

the by p r oduct Excess Air.

Excess Air is exactly what the name

implies, air that is in excess of what

is needed to burn all of the fuel.

The reason for this is more re l a t e d

to the ability to mix all of the fuel

and O2 for complete combustion.

Without some amount of excess air

not all of the fuel would burn com-

p l e t e l y, and this leads to the forma-

tion of CO instead of CO2.

Other fuels all contain the basic

i n g r edients for combustion, but also

may include other components

such as sulfur, fuel bound nitro g e n ,

soot and ash and water. T h e s e

either react with the oxygen to form

other pollutants or contribute to

additional losses.

Wet Loss

Dry Loss

figure 2

figure 3

Carbon Monxide is formed from incomplete combustion (partial oxidation of carbon in the

fuel). Typical causes are incomplete mixing of fuel and air, low combustion temperatures, or

not enough excess air.

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UEi EagleX Spécifications Page 13

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