That gentleman helped use software to simulate the next operating condition and calculate a flow rate
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This post was last edited by 394077 on 2018-7-27 at 15:20. The operating conditions are as follows: the medium is carbon monoxide gas, the pipe diameter is DN80 (with a control valve of DN40 in between), the pipeline length is 10 meters, the pressure at the starting end is 3.0 MPa (gauge pressure), and the pressure at the ending end is 6 kPa (gauge pressure, corresponding to the backpressure of the flare). The pressure difference remains constant; what is the simulated flow rate in Nm3/h? First, thanks to all of you!
The pressure difference you have is way too high; Aspen can’t handle it. When it’s reduced to 10 bar, the exit velocity is still over 140 m/s. Based on the calculations for the throat diameter, the flow rate is likely already supersonic. It’s impossible to perform calculations at 6 kPa – it’s probably reached the critical flow velocity
This post was last edited by 394077 on 2018-7-27 at 15:21. Thank you for your advice! May I ask what software or formula you used to calculate it?
This post was last edited by zhxbkofkyo on 2018-7-27 at 17:06. Didn’t I already write it in my reply? It’s Aspen. Additionally, I’m using a throat diameter of DN40; actually, 40 shouldn’t be used – the throat diameter should be much smaller so that the speed can be higher
Information such as the size of the control valve and its opening degree is very important.