Throttling issue of control valves
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In the urea process, the pressure at the exit of the synthesis tower is 20 MPa (before the valve), with a flow rate of 70,000 kg/h； The pressure behind the valve is 15.6 MPa; what is the flow rate? ? How is this calculated? Please, teachers, explain this. By the way, the diameter is 100.
I think this is a pressure relief valve, with a constant flow rate
Mass conservation also implies that the flow rate remains constant; it’s only the pressure that changes. This has nothing to do with large pipe diameters, unless there is a bypass before the valve
Yes, the mass flow rate doesn’t change. The regulating valve here serves to reduce pressure and adjusts the flow rate according to the set value.
The mass flow rate remains constant; if it is a gas, the volume flow rate will change.
The mass flow rate remains constant. Find the appropriate formula to calculate it.
The question I asked might not be quite right; haha, let me correct that. In other words, a orifice plate is used in place of a pressure reducing valve to achieve pressure reduction. How is the diameter of such an orifice plate calculated?
Special software is required; I once did the calculations and the error was too large. Simulate it with the designers