Liquid phase feed pressure
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A question on the concept of pressure: For example, a device has a liquid feed inlet, and the feed pressure is 3 MPa. What type of pressure is this feed pressure? Liquids are almost incompressible; then how is this pressure generated? The pressure generated by the thrust from the pump?
The pressure supplied by the pump is formed by the existing pressure within the equipment.
“I didn’t understand the phrase “the existing pressure within the equipment forms”. Could you please explain it?
What is the relationship between the compressibility of a liquid and pressure?
Pump discharge pressure and the pressure difference maintained by the equipment
Because gas is compressible, its pressure increases after compression； And since liquids are almost incompressible, where does their pressure come from?
Your specific process is not clear; the principle is similar to injecting liquid into a pressure vessel, with requirements regarding the mixture under certain pressure conditions. For example, an air-cooled tower works on the principle of injecting water at a pressure higher than atmospheric pressure into a pressure tank, which then sprays the water inside the container. The reference book recommended for chemical engineers is \"Principles of Chemical Engineering\".
The pressure of the device is established by the gas phase in the container. If I increase the pressure in the container to 3.2 MPa, flow can still enter through the pump, but the static pressure must be exactly 3.2 MPa, which results in a lower flow rate. Hydrostatic pressure cannot change the gas phase pressure, which is determined by the components/temperature of the gas phase.
The pressure is generated as needed throughout the system by safety valves that maintain a constant pressure.