Dual-valve control of flow rate
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Experts: There is a situation where I need to regulate the flow rate of hydrogen. In extreme cases, the pressure at the hydrogen inlet is 44 MPa, while it’s around 10 MPa at the outlet. A single flow control valve cannot withstand such high pressures; therefore, two valves are required. The desired flow rate is 30 g/s. Moreover, the system that receives the hydrogen at the downstream end is a closed, constant-volume system, which can be considered as a tank. In other words, the backpressure behind the control valve keeps increasing, until it reaches nearly 44 MPa, after which the flow stops. How can the flow rate be controlled under such operating conditions? Thank you, I’m begging for an answer.
‘The inlet pressure is 44 MPa. The system that receives hydrogen is a closed, constant-volume system, which can be considered as a tank; in other words, the back pressure at the rear of the control valve keeps increasing until it reaches nearly 44 MPa, after which it stops rising. ’If the pressure difference approaches zero, how can the flow rate be maintained? ?