A Comparison of Energy Recovery Devices: Hydraulic Pressure Booster and the Pelton Impulse Turbine
This paper compares the cost factors of the Hydraulic Pressure Booster (HPB) energy recovery device manufactured by Fluid Equipment Development Company (FEDCO) with the Pelton Impulse Turbine (PIT) in seawater reverse osmosis (SWRO) applications. All assumptions are based on reasonable engineering estimates.
Integrated Pressure and Flow Control in SWRO with a HEMI Turbo Booster
The high pressure hydraulic energy management integration (HP-HEMI) energy recovery device (ERD) centralizes brine hydraulic energy recovery, feed pressure and flow control and brine pressure and flow control into one compact and fully integrated unit. The objective is to dispense with feed pressure control valves (i.e. elimination of throttling losses) as well as a variable frequency drive (VFD) on the high pressure feed pump (HPP) resulting in the twin benefits of a substantial reduction in energy consumption and capital costs. This paper reports on test results of a production HP-HEMI coping with recoveries and pressures that accurately simulate an SWRO system dealing with typical feed temperature and membrane fouling variations.
Calculating the Life Cycle Cost of Energy Recovery Devices
A good way to minimize the cost of permeates is to apply Life Cycle Cost (LCC) analysis to every major component in a Seawater Reverse Osmosis (SWRO) system. The LCC of a component involves detailed calculations of capital and installation costs, operating costs (including maintenance and energy costs,) and costs of downtime.
A FEDCO High Pressure Booster (HPB) has design features to accommodate system changes. Built into every HPB is a brine control valve that allows partial control of the feed pressure, thereby reducing throttling losses at startup. During normal operation, the brine valve controls the brine pressure and flow with an average of 12% flexibility. To determine the brine valve set point, FEDCO has created its ‘Off Design Program’ to calculate this.
How to Increase Capacity and Improve Reliability of Ship and Off-Shore SWRO Systems
The most expensive real estate in the world is not in Dubai, London, Tokyo or Moscow; it is on ships and off-shore platforms, where every square foot can cost $300 - $500.
An increasing number platforms and marine vessels rely on seawater reverse osmosis (SWRO) systems to extract fresh water from seawater. SWRO system reliability is paramount to ensure adequate fresh water for personnel as well as process equipment. And the cost of on-board real estate demands the most space-efficient SWRO package possible.