Question
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In our DHDT unit (Axens licensor) one PV is given after the feed filter package to maintain a back pressure of 5kg/cm2. What is its importance? In the other DHDT unit (Haldor Topsoe) there is no PV given.
Apr-2021
Answers
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Tofan Santoso, PT indofarma, tofansantosoku@gmail.com
My guess your configuration is same with us, we also have DHDT unit licensed by Axens, so the backpressure needed for filter backwash operation. In our case the backpressure is maintained 4 kg/cm2 and I also agree with previous answer that may be the different filter system design between HT and Axens.
Jul-2021
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Jake Gotham, InSite Technical Services, jake.gotham@insitetechnical.com
Without seeing your drawings it would be difficult to know for sure why the valve is there, but…
My first guess is that the Axens unit has backwashed filters that use filtered feed to flush the fouled filters. The backpressure is necessary to drive the backwash flow through the fouled filter and away to slop.
My next guess is that the Haldor Topsoe unit either has cartridge filters (no backwash required) or uses a different fluid for backwash (e.g. product rundown) or operates with the feed drum at high enough pressure to drive the backwash.
Apr-2021
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