Motive pressure adjustment
Published on by Reza Nikbakht, Process Engineer in Technology
Hello everybody,
Usually, RO high pressure pumps motor in average and large size plants are equipped with VFD to adjust the process required motive pressure facing raw water temperature fluctuations, as well as very sof starting of high pressure pumps at start-up.
On the other hand, VFD is not considered in most small plants because of its high expense. What cheap alternate is conceived for this purpose?
Taxonomy
- RO Systems
- Reverse Osmosis
- Pumping System Design
- Variable Speed Drives
- Reverse Osmosis
- Low Temperature Distillation
- Plant Economics
- Water Supply
- Infrastructure
- Pumps
- Pumps Installation
- Desalination plant operations coordinator
1 Answer
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In small plants you can only do manual with concentrate valve(s) to hold constant? projected flow at changing temperatures. for slow start up can soft starter be used, but more comfortable is also here the VFD. Therefore you will need signals for the VFD as flow pressure and temperature. this isn't regular in small RO plants built in.
As always cheap capital cost isn't cheap operation. Lesson learnt doesn't work in pricing.