new reverse osmosis technology SWRO Design And Energy Recovery Part 1
Previously, the standard Hydropro design of SWRO with energy recovery included a single multi-stage centrifugal pump (or positive displacement) with a hydraulic turbocharger ).This design is fairly simple and often does not require a significant increase in system controls or instruments, and is largely a SWRO design for sound and energy saving.The hydraulic turbochargers convert the hydraulic energy of the concentrated flow to mechanical energy, and then apply this mechanical energy in the form of a considerable pressure boost to the full flow of the feed flow.In the first-class SWRO system, the energy benefits associated with this energy recovery device only achieve the requirements for the high-pressure feed pump in the form of lower pressure (thus reducing horsepower.Because the equations used to predict the pressure lift generated by HTB are usually specific to the manufacturer and depend on the system parameters, these equations are not explicitly discussed here.In this case, a reasonable assumption is a 300 psi (693 feet H 2 O) pressure lift for HTB operating in the system, as described in example 1 below.The following example is used to demonstrate a reduction in HP requirements for high-pressure feed pumps: this HTB energy recovery unit provides a significant reduction over energy consumption, where, depending on the work cycle and power costs, it can be paid by itself in a relatively short period of time.The concept of the Work Exchanger energy recovery unit is certainly not new, and several variants of these units have come and gone.However, in making this proposal, there seems to be a new approach to the design of these positive displacement devices, eliminating many of the problems associated with previous versions.PE of energy recovery company(ERI) is an example of a new type of work exchanger equipment that can profoundly influence the design and energy recovery industry of SWRO.The main idea of the pressure exchanger is that it is able to transfer most of the hydraulic energy in the concentrated flow directly into the equivalent water supply.The result is a side feed flow equal to the concentrated flow (minus the bearing leakage), which the pressure exchanger lifts to near the membrane feed pressure.A small high-pressure booster pump is then required to lift the high-pressure feed leaving the PE so that it is equal to the discharge pressure of the high-pressure feed pump, and two feed streams can be combined.This pressure lift accounts for the pressure loss associated with the low efficiency of the pressure exchanger, cross-membrane loss, and loss of pipes and accessories throughout the system.By significantly reducing the size of the high-pressure feed pump to approximate penetration flow, the horsepower of the high-pressure pump can reduce about 2 out of 3 of the required total pump power.This significant reduction in horsepower is largely due to the high-pressure, low-recovery properties of the SWRO system.To illustrate the effect of this reduction in the required pumping power, the following example is used: although when comparing systems without energy recovery and systems with PE, there are other energy considerations in addition to pumping power, this simple analysis shows that the energy consumption is significantly reduced when the pressure exchanger is used.
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