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Monday, June 15, 2009

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As discussed in earlier post "Estimate Wind Speed At Flare Tip At Different Height", correct wind speed at flare tip (elevated flare) is important in order to obtain correct estimate of radiation level and unburnt component concentration at downwind location, determination of minimum vapor flow to avoid flame-out and performance of pilots. A rather complicated equations may be used to estimate wind speed at different height.

This will present a rather simple relation to estimate the wind speed. The following equation may be considered.


Where
UZ = Wind speed at Z m at return duration of t0 hour (m/s)
U0 = Wind speed at specified height of 10m at return duration of t0 hour (m/s)
t0 = Wind speed at return duration i.e. 60 minutes, 1 minutes, etc
Z = Flare stack height (m)
K = Field data derived parameter (may use 0.125)

Example :
A flare stack with height of 200m, expose to wind speed (at 60 minutes return duration) of 10 m/s measured at 10m from grade. Determine wind speed at flare tip if the return duration stay as 60 minutes.

Solution (a)
Z = 200 m
U0 = 10 m/s



UZ = 14.54 m/s
Wind speed at flare tip with return duration stay as 60 minutes = 14.54 m/s

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posted by Webworm, 11:24 AM

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