Karoleana Roberts on wed 23 oct 96
>Which is better Venturi or forced air burners and why? I have read
>that
>you can control the air/fuel better with forced air burners than with
>the Venturi burner but it seems like you can control the air/fuel
>ratio
>on the venturi by adjusting the primary air intake. If you have a
>good
>draw in your kiln what would be the advantage of the forced air
>burner?
>
>Also, Bickley claims that you get more even, gentler heating with
>high
>velocity burners. Why would this be the case?
>
>Know of any good books, web sites on burners?
>
>Thanks,
>Karoleana
WardBurner@aol.com on wed 23 oct 96
Karoleana,
To answer your question about Venturi vs. forced air burners, I've posted a
couple of paragraphs from my catalog (pg 28). This is a BRIEF answer, If you
need more info, feel free to give me a call. If you would like a catalog,
send me your mailing address.
Power: Power burners are much better than Venturi burners for use with large
demand natural gas kilns. These burners do not rely on the action of the gas
and chimney to pull primary air into the burner. Whether using natural gas or
propane, power burners are not affected by weather conditions. Also, power
burners do not need chimney height to create draft. The chimney needs only to
be high enough to remove flue gases from the kiln building or shed. Because
all primary air is supplied and mixed by the blower, power burners are more
efficient. Their high volume and long flame length help to produce more even
firings. This volume and flame length also make it possible to run kilns on
two burners, replacing 4,6 or up to a 18 Venturi burners. On the down side,
power burners need electricity, making power failures problematic. With
proper safety equipment and installation, these problems can be averted.
Power burners are designed to operate on 7" WC pressure for natural gas and
11" WC pressure for LP (propane).
Venturi: These burners are best when used with LP, but work well on natural
gas in small kilns or with an adequate number of burners. One of the main
advantages of Venturi systems is operation without electricity. Since there
are no blowers, Venturi burners run quieter under low pressure than power
burners. Although generally not as efficient as power burners, they may be
turned down lower for preheating. (Power burners can be supplied with a small
Venturi pilot mounted to the head for this purpose). Venturi burners can
produce different BTU outputs with changes in pressure (see pg. 18). Higher
pressures reduce efficiency, but provide more flexibility than the set high
end output of power burners.
NOTE: Natural gas hook up involves many variables. The available pressure,
length of pipe run and the number of turns, pipe size, and the meter capacity
all affect the amount of gas that can be delivered to the kiln. Please
consult with us if you have any questions.
See ya'll in Vegas in April...drop by booth 73 and say hey.
Marc Ward
Ward Burner Systems
PO Box 333
Dandridge, TN 37725
USA
423.397.2914 voice
423.397.1253 fax
wardburner@aol.com
Karoleana asked:
>Which is better Venturi or forced air burners and why? I have read
>that
>you can control the air/fuel better with forced air burners than with
>the Venturi burner but it seems like you can control the air/fuel
>ratio
>on the venturi by adjusting the primary air intake. If you have a
>good
>draw in your kiln what would be the advantage of the forced air
>burner?
>
>Also, Bickley claims that you get more even, gentler heating with
>high
>velocity burners. Why would this be the case?
>
>Know of any good books, web sites on burners?
>
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