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Accumulator racks

  • US 10,247,205 B2
  • Filed: 02/03/2015
  • Issued: 04/02/2019
  • Est. Priority Date: 02/04/2014
  • Status: Active Grant
First Claim
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1. A method of charging a hydro-pneumatic energy storage system, the energy storage system comprising a first hydro-pneumatic accumulator comprising a first hollow vessel and, disposed within the first hollow vessel, a first compressible volume containing a first amount of gas, and the system comprising a second hydro-pneumatic accumulator comprising a second hollow vessel and, disposed within the second hollow vessel, a second compressible volume containing a second amount of gas, the method comprising the steps of:

  • pre-pressurizing the gas contained in the first volume to a first hydrostatic pre-charge pressure and pre-pressurizing the gas contained in the second volume to a second hydrostatic pre-charge pressure, the second pre-charge pressure being higher than the first pre-charge pressure;

    pressurizing the gas in the first volume by discharging a non-compressible hydraulic fluid into the first vessel while keeping a quantity of non-compressible hydraulic fluid contained in the second vessel constant to keep the pressure of the gas contained in the second volume at the second pre-charge pressure; and

    ,when the pressure of the gas in the first volume reaches the second pre-charge pressure, pressurizing the gas in the second volume by discharging a non-compressible hydraulic fluid into the second vessel.

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