Page 194 - Boiler plant and distribution system optimization manual
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Over 100 Ways to Improve Efficiency 179
the temperature at which sulfuric acid and other below the dew point, thereby extracting latent
acids form. An efficiency increase of 11% to 15% heat from the flue gas moisture, efficiencies above
is possible with most boilers if the flue gasses can 95% can be expected. Examples of this technology
be cooled below the dew point. Natural gas, be- are: pulse combustion, advanced fiber burner de-
cause of its higher hydrogen content, produces signs, special coated plate exchangers, glass tube
higher efficiency increases with this method than exchangers, Teflon coated tubes and spray tower
oil. When flue gas temperatures can be dropped direct-contact heat exchangers.
Figure 10.78—Condensing flue gases. As the combustion system exhaust goes down
below ~135F the steam in the combustion gases begins to condense out liberating a
lot of latent heat into the spray water.
Figure 10.79—Condensing flue gases. As the combustion system exhaust
goes down below ~135F the steam in the combustion gases begins to con-
dense out liberating a lot of latent heat into the spray water.
