WO2017174047A1 - Power storage with black starting capability on the basis of pressurized air and water - Google Patents

Power storage with black starting capability on the basis of pressurized air and water Download PDF

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Publication number
WO2017174047A1
WO2017174047A1 PCT/DE2016/000151 DE2016000151W WO2017174047A1 WO 2017174047 A1 WO2017174047 A1 WO 2017174047A1 DE 2016000151 W DE2016000151 W DE 2016000151W WO 2017174047 A1 WO2017174047 A1 WO 2017174047A1
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WO
WIPO (PCT)
Prior art keywords
pressure
water
valve
power
pressurized air
Prior art date
Application number
PCT/DE2016/000151
Other languages
German (de)
French (fr)
Inventor
Dirk Weber
Udo Dittmer
Original Assignee
Dirk Weber
Udo Dittmer
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dirk Weber, Udo Dittmer filed Critical Dirk Weber
Priority to DE112016006708.9T priority Critical patent/DE112016006708A5/en
Priority to PCT/DE2016/000151 priority patent/WO2017174047A1/en
Publication of WO2017174047A1 publication Critical patent/WO2017174047A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/031—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to a system that can capture current surpluses, peak peaks, store and deliver when needed. Next, the system can compensate.
  • the use of the system can be used in commercial as well as in
  • This system enables the controllable operation of renewable energies such as photovoltaic and wind power plants as well as combined heat and power plants.
  • the storage system is set by means of a pressure vessel (1).
  • Pressure vessel (1) is air, which is biased with a pressure of 5 bar, so compressed air (DL).
  • DL compressed air
  • NW standard water
  • the feed pump (7) is supplied with power from surpluses or peak production (peaks).
  • motor-controlled shut-off valves (2) and (3) are provided to control the individual plant components.
  • the motor-controlled shut-off valve (3) to the feed pump (7) and the motor-controlled shut-off valve (2) on the pressure vessel (1) is opened.
  • the motor-controlled shut-off valve (2) and the motor-controlled shut-off valve (3) is open to the turbine.
  • the pressure-mass valve (4) consists of three components with which the pressure in the power range of 0.5 bar to 20 bar can be controlled, and the flow rate can be controlled.
  • the pressure power range is controlled by means of a motor-controlled pressure reducing valve s independent of the fürströmmasse.
  • the fürströmmasse is
  • the turbine (5) is able to drive full load from approx. 5 sec. To 15 sec. Due to the water pressure and water mass applied to the turbine (type: Pelton turbine) (5), a longer startup time of the turbine (5 ) is not scheduled.
  • the regulated mass (NW) flows through the turbine (5) and drives a generator (6) via a shaft. This generator produces electricity for the consumer.
  • the pressureless standard water (NW) flowing out of the turbine (5) passes via a discharge line (9) into a concrete basin (8). It stays there until the process begins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The invention relates to a system that represents a method of power storage by means of a pressurized air/water system. The system is based on the initial state that power from a power source is used to drive a feed pump (7). The feed pump (7) feeds standard water (NW) from a underground tank (8) by way of a feed pressure line (11) into a pressure vessel (1). In the pressure vessel (1) there is pressurized air (DL); this pressurized air (DL) is then compressed by the fed standard water (NW) and consequently forms in the pressure vessel (1) a pressure cushion that represents the power storage. Once the pressurized air has been compressed to the required pressure/power output level (2.1), a motor-controlled shut-off valve (2) shuts off the feed pressure line (11). The power storage has consequently been charged (tensioned). The motor-controlled shut-off valve (3) shuts off the feed pressure line in the direction of the feed pump (7). If there is a power request from a consumer, the motor-controlled shut-off valves (2) and (3) are electrically opened. The opening of the motor-controlled shut-off valves (2) and (3) has the effect that the standard water (NW) located in the pressure vessel (1) is forced through the compressed pressurized-air cushion into the pressure line (10) and reaches the production control (DMR valve) (4). The standard water (NW) lies at the production control (DMR valve) (4) and is set to the respective required water pressure and/or to a respective required amount of water by means of a pressure-mass-regulating valve (DMR valve) (4). The standard water (NW), which has then been adjusted with the required parameters, flows by way of a turbine pressure line to the turbine (5). The turbine begins to rotate and drives a connected generator (6), which produces power for the consumer. The standard water (NW) running pressurelessly out of the turbine (5) passes by way of an outflow line (9) into an underground tank and remains there until the process recommences.

Description

Schwarzstartfähige Stromspeicherung auf der Basis von Druckluft und Wasser Beschreibung (de):  Black-startable electricity storage based on compressed air and water Description (de):
Die Erfindung betrifft ein System, dass Stromüberschüsse, Stromspitzen (Peaks) auffangen, speichern und bei Bedarf abgeben kann. Weiter kann das System ausgleichen. Die Nutzung des Systems kann im gewerblichen sowie auch im The invention relates to a system that can capture current surpluses, peak peaks, store and deliver when needed. Next, the system can compensate. The use of the system can be used in commercial as well as in
privaten Gebrauch Anwendung finden. find private use.
Durch dieses System wird ein regelbarer Betrieb von erneuerbaren Energien wie der Photovoltaik und Windkraftanlagen, aber auch Blockheizkraftwerke ermöglicht. This system enables the controllable operation of renewable energies such as photovoltaic and wind power plants as well as combined heat and power plants.
Alle Medien, die dieses System benötigt sind Druckluft und Wasser, also somit nicht giftig (nicht toxisch, es finden keine Umweltbelastungen statt, Umweltschäden können nicht verursacht werden). All media that this system requires are compressed air and water, therefore non-toxic (non-toxic, no environmental impact, no environmental damage can be caused).
Das Speichersystem wird mittels eines Druckbehälters (1) gestellt. In diesem The storage system is set by means of a pressure vessel (1). In this
Druckbehälter (1) befindet sich Luft, die mit einem Druck auf 5 bar vorgespannt ist, also Druckluft (DL). Um einen Speichereffekt zu erzielen wird mit einem weiteren Medium Normwasser (NW) gearbeitet. Pressure vessel (1) is air, which is biased with a pressure of 5 bar, so compressed air (DL). In order to achieve a memory effect, another medium of standard water (NW) is used.
Wird das zweite Medium (Normwasser - NW) mittels einer Förderpumpe (7) gegen das If the second medium (standard water - NW) by means of a feed pump (7) against the
Figure imgf000003_0001
aaaan lAfi rrl
Figure imgf000003_0001
aaaan lAfi rrl
komprimiert und stellt somit vergleichsweise eine Fallhöhe von 200 Metern dar, die aus Pumpspeicherkraftwerken bekannt ist. compresses and thus comparatively represents a drop height of 200 meters, which is known from pumped storage power plants.
Die Förderpumpe (7) wird mit Strom aus Überschüssen oder Spitzenproduktionen (Peaks) gespeist.  The feed pump (7) is supplied with power from surpluses or peak production (peaks).
Für Sicherungsmaßnahmen ist eine Sicherheitsgruppe (1.1) sowie eine Ab- und  For security measures, a security group (1.1) as well as an off and
Anschaltelektronik (2.1) im Druckbehälter (1) vorgesehen, die einen reibungslosen und sichergestellten Betrieb gewährleistet. Anschaltelektronik (2.1) provided in the pressure vessel (1), which ensures a smooth and safe operation.
Zur Steuerung der einzelnen Anlagenbauteile sind motorgesteuerte Absperrventile (2) und (3) vorgesehen. Im Betriebsfall des Aufladens des Druckbehälters ist das motorgesteuerte Absperrventil (3) zur Förderpumpe(7) sowie das motorgesteuerte Absperrventil (2) am Druckbehälter (1) geöffnet. Im Betriebsfall der Abgabe von Normwasser (NW) ist das motorgesteuerte Absperrventil (2) sowie das motorgesteuerte Absperrventil (3) zur Turbine geöffnet. To control the individual plant components motor-controlled shut-off valves (2) and (3) are provided. In the operating case of the charging of the pressure vessel, the motor-controlled shut-off valve (3) to the feed pump (7) and the motor-controlled shut-off valve (2) on the pressure vessel (1) is opened. In the operating case of the delivery of standard water (NW), the motor-controlled shut-off valve (2) and the motor-controlled shut-off valve (3) is open to the turbine.
Im Betriebsfall einer Ruhephase sind alle motorgesteuerten Absperrventile (2) und (3) geschlossen. In the case of operation of a rest phase all motor-controlled shut-off valves (2) and (3) are closed.
Im Betriebsfall einer Anforderung vom Verbraucher her, werden die motorgesteuerten Absperrventile (2) und zur Turbine hin (3) geöffnet. Das Normwasser (NW) strömt über die Druckleitung (10) zur Betriebsgruppe (Druck-Masse-Ventil (DMR-Ventil)) (4), dass sich vor der Turbine (5) befindet.  In the case of a request from the consumer ago, the motorized shut-off valves (2) and the turbine (3) are opened. The standard water (NW) flows via the pressure line (10) to the operating group (pressure-mass valve (DMR valve)) (4), which is located in front of the turbine (5).
Das Druck-Masse-Ventil (4) besteht aus drei Bauteilen mit denen der Druck im Leistungsbereich von 0,5 bar bis 20 bar geregelt werden kann, sowie die Durchflussmenge geregelt werden kann.  The pressure-mass valve (4) consists of three components with which the pressure in the power range of 0.5 bar to 20 bar can be controlled, and the flow rate can be controlled.
Der Druckleistungsbereich wird mittels eines motorgesteuerten Druckminderventil s unabhängig von der Durchströmmasse geregelt. Die Durchströmmasse wird The pressure power range is controlled by means of a motor-controlled pressure reducing valve s independent of the Durchströmmasse. The Durchströmmasse is
mittels eines motorgesteuerten Durchströmregulierventil by means of a motor-controlled Durchströmregulierventil
einzeln und unabhängig von einander geregelt. Im Bedarfsfall können beide technischen Parameter (Druck und Masse) für die jeweilige Anforderung eingestellt werden. individually and independently of each other. If necessary, both technical parameters (pressure and mass) can be set for the respective requirement.
Für einen evtuellen Wartungs- oder Reparaturfall sind im DMR-Venti (4) zwei manuell bedienbare Absperrventile vorgesehen, damit der Betrieb in dieser Phase nicht beeinträchtigt wird. For a possible maintenance or repair case, two manually operated shut-off valves are provided in the DMR-Venti (4), so that operation in this phase is not impaired.
Durch die an der Turbine (Typ: Peltonturbine) (5) anliegende gerulierter Wasserdruck- und Wassermasse ist die Turbine (5) in der Lage von ca. 5 sec. bis 15 sec. Volllast fahren zu können, eine längere Anlaufzeit der Turbine (5) ist nicht vorgesehen. The turbine (5) is able to drive full load from approx. 5 sec. To 15 sec. Due to the water pressure and water mass applied to the turbine (type: Pelton turbine) (5), a longer startup time of the turbine (5 ) is not scheduled.
Die einregulierte Masse (NW) strömt durch die Turbine (5) und treibt über eine Welle einen Generator (6) an. Dieser Generator produziert Strom für den Verbraucher. The regulated mass (NW) flows through the turbine (5) and drives a generator (6) via a shaft. This generator produces electricity for the consumer.
Das aus der Turbine (5) strömende drucklose Normwasser (NW) gelangt über eine Auslaufleitung (9) in ein Betonbecken (8). Dort verbleibt es, bis der Prozess von neuen beginnt. The pressureless standard water (NW) flowing out of the turbine (5) passes via a discharge line (9) into a concrete basin (8). It stays there until the process begins.
Um den Prozess der Abgabe (Stromerzeugung) zu beginnen, werden keine externen Energien benötigt. Der Prozess in der Abgabephase wird mittels Druckluft und öffnen von motorgesteuerten Absperrventile in Funktion gesetzt. Es ist somit Schwarzstartfähig. To start the process of delivery (power generation), no external energy is needed. The process in the discharge phase is by means of compressed air and open set by motorized shut-off valves in function. It is thus black bootable.

Claims

Ansprüche: Claims:
...Anspruch: ...Claim:
Vorgespannte Energiespeicherung  Preloaded energy storage
Stromenergie mittels eines Druckbehälters (1) mit den Medien Luft und Wasser im Bereich von 0 bar bis 20 bar zu speichern.  To store electricity energy by means of a pressure vessel (1) with the media air and water in the range of 0 bar to 20 bar.
2. Anspruch:  2. Claim:
Leistungsbereiche (Druck) und Wassermenge (Masse) für einen variabelen Betrieb schnell regulierbar machen. (DMR-Ventil) (4).  Power ranges (pressure) and water volume (mass) for a variable operation quickly regulate. (DMR valve) (4).
Eine Ventileinheit, dass innerhalb von 5 sec. Bis 15 sec. Druck und Wassermasse für die jeweilige Anforderung vom Verbraucher her motorgesteuert in einem  A valve unit that within 5 sec. To 15 sec. Pressure and water mass for the respective request from the consumer motor controlled in one
Leistungsbereich von 0,5 bar bis 20 bar sowie die Wassermasse reguliert. Power range from 0.5 bar to 20 bar and the water mass regulated.
3. Anspruch:  3. Claim:
Schwarzstartfähigkeit mittels Druckluftpolster.  Black start capability by means of compressed air cushion.
Vorgespannte Luft mittels einer gegengepumpten Wassermasse zu komprimieren und diese somit Schwarzstartfähig machen.  To compress pre-stressed air by means of a counter-pumped water mass and thus make them black start capable.
4. Anspruch:  4. Claim:
Medienanspruch - Einsatz von nicht giftigen Betriebsstoffen  Media claim - Use of non-toxic consumables
Für den betrieb werden ausschließlich nicht giftige Betriebsstoffe (Umgebungsluft und Naturwasser, Normwasser) genutzt.  For operation, only non-toxic operating materials (ambient air and natural water, standard water) are used.
5. Anspruch:  5. Claim:
Aufgabenbereiche responsibilities
Zur Speicherung von Überschussstrom, Abnahme von Stromspitzen (Peaks), allgemeinem Stromversorgung, zur Stromversorgung von autarken Inselanlagen, zur Ab- und Anhebung von Stromnetzen (Regulierbetrieb). For the storage of surplus current, decrease of current peaks, general power supply, for the power supply of autonomous stand-alone systems, for the lowering and raising of power grids (regulation mode).
6.Anspruch: 6.Anspruch:
Druckbehälteraufstellung  Pressure vessel formation
Nutzung von Druckbehältern innerhalb eines Betonerdbehälterbecken.  Use of pressure vessels within a concrete earth tank.
PCT/DE2016/000151 2016-04-08 2016-04-08 Power storage with black starting capability on the basis of pressurized air and water WO2017174047A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112016006708.9T DE112016006708A5 (en) 2016-04-08 2016-04-08 Black-startable electricity storage based on compressed air and water
PCT/DE2016/000151 WO2017174047A1 (en) 2016-04-08 2016-04-08 Power storage with black starting capability on the basis of pressurized air and water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2016/000151 WO2017174047A1 (en) 2016-04-08 2016-04-08 Power storage with black starting capability on the basis of pressurized air and water

Publications (1)

Publication Number Publication Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022168096A1 (en) * 2021-02-04 2022-08-11 Storage Drop Ltd System and method for storing energy, and for recovering stored energy by using liquid and gas as pistons

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993006367A1 (en) * 1991-09-25 1993-04-01 Grupping Arnold A system for subterranean storage of energy
WO2011101647A2 (en) * 2010-02-22 2011-08-25 Hilary Champion Energy storage systems
AT13733U1 (en) * 2013-03-25 2014-07-15 Garamanta Beteiligungs Gmbh accumulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993006367A1 (en) * 1991-09-25 1993-04-01 Grupping Arnold A system for subterranean storage of energy
WO2011101647A2 (en) * 2010-02-22 2011-08-25 Hilary Champion Energy storage systems
AT13733U1 (en) * 2013-03-25 2014-07-15 Garamanta Beteiligungs Gmbh accumulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022168096A1 (en) * 2021-02-04 2022-08-11 Storage Drop Ltd System and method for storing energy, and for recovering stored energy by using liquid and gas as pistons

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