Boiler feed water
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By how much should the boiler feedwater pressure in a waste heat boiler for sulfur recovery be higher than the pressure of the steam produced? For example, for steam at 4.1 MPa.g, what water pressure is appropriate? Additionally, if the existing water pressure in the system is higher than that value, should a pressure reducing valve be installed, or can the pressure be reduced directly through a level control valve?
The waste boiler of our unit generates steam at 4.0 MPa, while the outlet pressure of the boiler feed water pump is 5.4 MPa. You can check the relevant specifications for the specific data.
Generally, the pressure difference before and after is kept around 6–10 kilograms, while also paying attention to the required flow rate.
Does the pressure difference of 6-10 kgf mentioned above refer to the pressure difference between the boiler feedwater and steam? The boiler feed water pressure indicated by the system right now is 60 kgf, while the steam pressure is 41 kgf. Should I use a pressure reducing valve, or should I control it using the calculated pressure difference from a level control valve?