Max. Air flow in combustion air nozzle-urgently

[hjmin]

Hello all,

we have a burner which use a napha for fuel and it have combustion air nozzle in burner.

Combustion air flow 380 m3/min @ ATM
Combustion air fan discharge pressure : 500 mmAQ
Combustion air nozzel area : 120mm X 25mm


I would like to know what max. volume can go through that nozzle?
because we have enough fan capacity, but we can not increase to that air flow. so now we think it bottleneck is combustion air nozzel.
please can you calculate Max. vol. flow in this nozzle.

thank you

 

[hanon]

There are equations to calculate the maximun gas flow through a nozzle in many fluid flow books (Coulson,...) and also is implemented in many software packages. It depends of course of the nozzle area and the maximun delta pressure available. Maybe the equation is represented to calculate the DP for a given flow, so you will have to itereate increasing the flow until you reach the currently DP you have in your system