WO2015174726A1 - Energy storage apparatus using power generation turbine and compressed gas by pump - Google Patents

Energy storage apparatus using power generation turbine and compressed gas by pump Download PDF

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Publication number
WO2015174726A1
WO2015174726A1 PCT/KR2015/004767 KR2015004767W WO2015174726A1 WO 2015174726 A1 WO2015174726 A1 WO 2015174726A1 KR 2015004767 W KR2015004767 W KR 2015004767W WO 2015174726 A1 WO2015174726 A1 WO 2015174726A1
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Prior art keywords
working fluid
tank
gas
pressure
energy
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PCT/KR2015/004767
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French (fr)
Korean (ko)
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이영호
김창구
박지훈
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한국해양대학교 산학협력단
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Publication of WO2015174726A1 publication Critical patent/WO2015174726A1/en

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    • 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
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • 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

Definitions

  • the present invention relates to an energy storage device, and more particularly, to an energy storage device using a power generation turbine by a compressed gas in a closed space and a high pressure working fluid in a liquid state.
  • compressed air produced through an air compression means such as a compressor or a cylinder is an energy source that can be used in power generation facilities or power storage facilities, and conventionally there is no separate device for storing it in the form of energy, such pneumatic energy Development of storage devices is urgently needed.
  • battery-based energy storage systems are the mainstream, mechanical research and development has not been carried out much, and optimization of pump and turbine efficiency and minimization of electricity consumption in storage processes have been carried out. A control system construction process is required.
  • the present invention has been made to solve the above problems, and provides an energy storage device that can improve the energy storage efficiency by a mechanical configuration such as a compressed gas in a closed space by a pump and a hydraulic turbine using a high-pressure working fluid in a liquid state. Its purpose is to.
  • an object of the present invention is to provide an energy storage device capable of producing a constant electric energy in response to changes in pressure and flow rate of the working fluid.
  • An energy storage device includes a first tank for storing a working fluid in a liquid state; A second tank storing gas, and compressed or expanded by a working fluid entering and exiting the gas; One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid supply path for supplying a working fluid to the second tank; One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid recovery path for recovering the working fluid to the first tank; A storage pump provided on the working fluid supply path and supplying the working fluid stored in the first tank to the second tank to generate stored energy in the form of compressed gas; And a power turbine provided on the working fluid recovery path and rotating at a pressure of the working fluid recovered by the expansion of the gas in the second tank to generate electrical energy.
  • the first tank of the present invention the upper side is open to the atmosphere serves as a storage tank when supplying the working fluid or the recovery of the working fluid, the second tank except the fastening portion of the working fluid supply passage and the working fluid recovery passage And forming a sealed space to change the internal gas pressure as the working fluid enters and exits.
  • a first valve provided on at least one side of the both sides of the storage pump on the working fluid supply passage, the first valve is opened only when supplying the second tank of the working fluid;
  • a second valve provided on at least one of both sides of the power generation turbine on the working fluid recovery path, and opened only when the first tank of the working fluid is recovered.
  • the second valve of the present invention is formed between the second tank and the power turbine on the working fluid recovery path, it characterized in that to maintain a constant pressure and flow rate of the working fluid recovered by adjusting the opening degree.
  • the power turbine of the present invention is characterized in that it comprises a synchronous generator and an inverter capable of variable speed control to generate a constant electric energy even if the pressure change and the flow rate change of the working fluid to be recovered.
  • the energy storage device of the present invention is energy by utilizing a combination of a mechanical configuration using a compressed gas in a closed space and a working fluid in the liquid state, that is, a combination of a pumped energy storage method and a compressed air energy storage method There is an effect that can improve the storage efficiency.
  • the energy storage device of the present invention has the effect of producing a constant electric energy in response to changes in the pressure and flow rate of the working fluid.
  • FIG. 1 is a schematic diagram of an energy storage device according to an embodiment of the present invention.
  • FIG. 2 is a view showing the energy storage state of the energy storage device according to an embodiment of the present invention.
  • FIG. 3 is a view showing an energy generation state of the energy storage device according to an embodiment of the present invention.
  • FIGS. 1 to 3 are views for explaining an energy storage device according to an embodiment of the present invention.
  • Figure 1 is a schematic diagram of an energy storage device according to an embodiment of the present invention
  • Figure 2 is a view showing the energy storage state of the energy storage device according to an embodiment of the present invention
  • Figure 3 is 1 is a diagram illustrating an energy generation state of an energy storage device according to one embodiment.
  • the energy storage device As shown in Figures 1 to 3, the energy storage device according to an embodiment of the present invention, the first tank 110, the second tank 120, the working fluid supply path 130, the working fluid recovery path 140, storage pump 150, and power generation turbine 160.
  • the first tank 110 stores the working fluid in the liquid state.
  • the first tank 110 is an atmospheric open tank in which the upper one side is opened to the atmosphere and serves as a storage tank at the time of supplying the working fluid or recovering the working fluid. That is, when the working fluid is supplied, the air is filled in the upper portion of the first tank 110 as much as the working fluid is discharged. When the working fluid is recovered, the air is supplied to the upper portion of the first tank 110 as much as the working fluid is recovered. Since it is discharged, smooth supply and recovery can be made without disturbing the air pressure change.
  • the working fluid in the liquid state is used as a medium for compressing the gas of the second tank 120 at the time of supply, is used to provide a rotational force to the aberration of the power turbine 160 during recovery, water, oil, etc.
  • Any fluid may be used as long as it is a liquid fluid.
  • the second tank 120 stores the gas, and the gas is compressed or expanded by the working fluid coming in and out.
  • the second tank 120 may form an airtight space except for the fastening portions of the working fluid supply path 130 and the working fluid recovery path 140 to change the internal gas pressure according to the entry and exit of the working fluid.
  • the gas may use general air in the atmosphere, if necessary, excellent compression and expansion force, it is also possible to use a gas that does not dissolve in the working fluid.
  • the working fluid supply path 130 is for supplying the working fluid of the first tank 110 to the second tank 120, one end of which is fastened to the lower end of the first tank 110 and the other end of the second tank ( 120 is fastened to the bottom.
  • the working fluid recovery path 140 is for recovering the working fluid of the second tank 110 to the first tank 110, one end of which is fastened to the lower end of the first tank 110 and the other end of the second tank ( 120 is fastened to the bottom.
  • the storage pump 150 is provided on the working fluid supply path 130, and supplies the working fluid stored in the first tank 110 to the second tank 120 to generate stored energy in the form of compressed gas. That is, the storage pump 150 is driven by the surplus electric energy, etc., and fills the working fluid from the lower end of the second tank 120 to compress the gas inside the second tank 120 to form a closed space. As a result, the gas is compressed and energy is stored.
  • the power generation turbine 160 is provided on the working fluid recovery path 140 and rotates at a pressure of the working fluid recovered by the expansion of the gas in the second tank 120 to generate electrical energy. That is, the working fluid is pushed out of the second tank 120 to the working fluid recovery path 140 by the force of expanding the compressed gas to generate the working fluid pressure and to rotate the turbine by the working fluid pressure at this time.
  • the power turbine 160 when water is used as the working fluid, it is preferable to use a hydro turbine.
  • the energy storage device is provided on at least one side of both sides of the storage pump 150 on the working fluid supply path 130, and is opened only when supplying the second tank 120 of the working fluid.
  • the second valve 180 is provided on at least one side of both sides of the power turbine 160 on the first valve 170 and the working fluid recovery path 140 to be opened only when the first tank 110 of the working fluid is recovered. It is possible to further include).
  • the first valve 170 is opened at the time of supplying the second tank 120 of the working fluid to smoothly proceed the supply of the working fluid by the storage pump 150, and at the time of recovering the first tank 110 of the working fluid. Is blocked to block the working fluid from being recovered or backflowed through the working fluid supply path 130. Accordingly, energy loss can be prevented and damage to the storage pump 150 can be prevented.
  • the second valve 180 is opened at the time of recovery of the first tank 110 of the working fluid to smoothly proceed the supply of the working fluid to the power turbine 160, and at the time of supplying the second tank 120 of the working fluid. It is blocked to block the working fluid is supplied or backflow through the working fluid recovery path 140. Accordingly, energy loss can be prevented and damage to the power generation turbine 160 can be prevented.
  • the second valve formed between the second tank 120 and the power turbine 160 on the working fluid recovery path 140 among the second valves 180 may adjust the opening degree and the pressure and flow rate of the working fluid recovered. It is possible to keep it constant. As a result, even when the pressure and flow rate of the working fluid increase due to the strong gas pressure at the time of recovery, or when the pressure and flow rate of the working fluid decrease due to the weakened gas pressure at the end, the front side of the power generation turbine 160 By adjusting the opening degree of the second valve provided, the pressure and flow rate of the working fluid supplied to the power generation turbine 160 can be kept as constant as possible. Therefore, it is possible to maintain a constant turbine revolutions per minute of the power generation turbine 160 to produce high-quality electrical energy and to minimize the load and damage of the device.
  • variable speed control in addition to adjusting the opening degree of the second valve, is performed so that the power generation turbine 160 generates constant electric energy even when a pressure change and a flow rate change of the recovered working fluid occur. It is possible to comprise possible synchronous generators and inverters.
  • the energy storage device utilizes a combination of a mechanical configuration using a compressed gas in a closed space and a working fluid in a liquid state, that is, a combination of a pumped energy storage method and a compressed air energy storage method.
  • a combination of a pumped energy storage method and a compressed air energy storage method By increasing the force applied to the power turbine can increase the rotational force and by reducing the energy loss as much as possible, it can improve the energy storage efficiency.
  • the turbine can operate in response to the pressure and flow rate in the second tank generated during the discharge process.

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

Abstract

The present invention relates to an energy storage apparatus and, more specifically, to an energy storage apparatus using a power generation turbine by a high-pressure working fluid in a liquid state and a compressed gas in an enclosed space. The energy storage apparatus according to the present invention comprises: a first tank for storing a working fluid in a liquid state; a second tank for storing a gas and compressing or expanding the gas by the working fluid entering/exiting same; a working fluid supply channel having one end fastened to the lower end of the first tank and the other end fastened to the lower end of the second tank so as to supply the working fluid to the second tank; a working fluid return channel having one end fastened to the lower end of the first tank and the other end fastened to the lower end of the second tank so as to return the working fluid to the first tank; a storage pump provided on the working fluid supply channel, for supplying the working fluid stored in the first tank to the second tank, thereby generating stored energy in the form of a compressed gas; and a power generation turbine provided on the working fluid return channel and rotated by the pressure of the working fluid returned by the expansion of the gas inside the second tank, thereby generating electrical energy.

Description

펌프에 의한 압축 기체 및 발전 터빈을 이용한 에너지 저장 장치Energy storage system using compressed gas and power turbine by pump
본 발명은 에너지 저장 장치에 관한 것으로, 보다 상세하게는 밀폐공간의 압축 기체와 액체상태의 고압 작동유체에 의한 발전 터빈을 이용한 에너지 저장 장치에 관한 것이다.The present invention relates to an energy storage device, and more particularly, to an energy storage device using a power generation turbine by a compressed gas in a closed space and a high pressure working fluid in a liquid state.
최근, 에너지의 급격한 수요에 따라 근래 들어 석탄, 석유 및 천연가스등의 화석연료 부족 현상이 심화되고, 환경오염이 점차 사회적 문제로 대두되고 있으며, 이와 같은 문제점을 해결하고자 에너지 효율이 높고 환경오염이 적은 다양한 친환경적인 에너지원에 대한 관심이 높아지고 있다.Recently, due to the rapid demand for energy, the shortage of fossil fuels such as coal, oil, and natural gas is intensifying, and environmental pollution is gradually becoming a social problem. To solve such problems, high energy efficiency and low environmental pollution There is a growing interest in various environmentally friendly energy sources.
일반적으로 자연환경을 이용하여 에너지를 얻는 방법으로서 수위차를 이용하는 수력발전, 바람을 이용한 풍력발전, 태양에너지를 이용한 태양열발전, 바다에서 발생하는 파도의 힘을 이용하는 파력발전 등의 여러 가지 방법이 있다. 이와 같은 발전방식에 있어서 상기 수력발전의 경우, 댐을 건설하여 풍족한 유량을 확보해야 하고, 낙하된 후의 물을 재사용하기 어려우며, 갈수기 및 결빙기에는 유수량이 적어 전력생산에 차질이 생기는 단점이 있다. 또한, 풍력발전이나 태양열 발전도 수시로 변하는 자연현상 및 기상의 변화에 영향을 크게 받게 되고, 설치장소의 지형적 제한이 있으며, 원자력 발전과 화력발전은 환경오염 물질을 배출하는 단점이 있다.In general, there are various methods of obtaining energy using the natural environment, such as hydro power generation using water level difference, wind power generation using wind, solar power generation using solar energy, and wave power generation using wave power generated from the sea. . In such a power generation method, in the case of the hydroelectric power generation, a dam must be secured in order to ensure abundant flow rate, it is difficult to reuse water after falling, and there is a disadvantage in that power generation is low due to low amount of water in the dry season and the ice breaker. In addition, wind power and solar power are also greatly affected by natural phenomena and meteorological changes that change frequently, there is a geographical limitation of the installation site, nuclear power and thermal power generation has the disadvantage of emitting environmental pollutants.
한편, 콤프레셔 또는 실린더와 같은 공기압축수단을 통해 생산되는 압축공기는 발전시설이나 축전설비에 사용 가능한 에너지원으로서, 종래에는 이를 에너지 형태로 보관하기 위한 별도의 장치가 구비되어 있지 않으므로, 이러한 공기압 에너지 저장장치의 개발이 시급한 실정에 있다. 구체적으로, 현재 배터리 방식의 에너지 저장 시스템이 주류를 이루고 있는 반면에 기계식의 연구개발은 많이 이루어지지 않은 상태이며, 펌프 및 터빈 효율 향상을 위한 최적화 과정 및 저장 과정에서의 전기 소비를 최소로 하기 위한 제어시스템 구축 과정이 필요하다.On the other hand, compressed air produced through an air compression means such as a compressor or a cylinder is an energy source that can be used in power generation facilities or power storage facilities, and conventionally there is no separate device for storing it in the form of energy, such pneumatic energy Development of storage devices is urgently needed. Specifically, while battery-based energy storage systems are the mainstream, mechanical research and development has not been carried out much, and optimization of pump and turbine efficiency and minimization of electricity consumption in storage processes have been carried out. A control system construction process is required.
본 발명은 상기의 문제점을 개선하기 위하여 안출된 것으로, 펌프에 의한 밀폐공간의 압축 기체와 액체상태의 고압 작동유체를 이용한 수력터빈 등 기계적 구성으로 에너지 저장 효율을 향상시킬 수 있는 에너지 저장 장치를 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, and provides an energy storage device that can improve the energy storage efficiency by a mechanical configuration such as a compressed gas in a closed space by a pump and a hydraulic turbine using a high-pressure working fluid in a liquid state. Its purpose is to.
또한, 본 발명은 작동유체의 압력 및 유량 변화에 대응하여 일정한 전기에너지를 생산할 수 있는 에너지 저장 장치를 제공하는데 그 목적이 있다. In addition, an object of the present invention is to provide an energy storage device capable of producing a constant electric energy in response to changes in pressure and flow rate of the working fluid.
본 발명이 해결하고자 하는 과제들은 이상에서 언급한 과제로 제한되지 않으며, 여기에 언급되지 않은 본 발명이 해결하려는 또 다른 과제들은 아래의 기재로부터 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 명확하게 이해될 수 있을 것이다.The problem to be solved by the present invention is not limited to the above-mentioned problem, another problem to be solved by the present invention not mentioned herein is to those skilled in the art from the following description. It will be clearly understood.
본 발명에 따른 에너지 저장 장치는, 액체 상태의 작동유체를 저장하는 제1 탱크; 기체를 저장하며, 출입되는 작동유체에 의해 기체가 압축 또는 팽창되는 제2 탱크; 일단이 제1 탱크의 하단에 체결되고, 타단이 제2 탱크의 하단에 체결되며, 작동유체를 제2 탱크로 공급하기 위한 작동유체 공급로; 일단이 제1 탱크의 하단에 체결되고, 타단이 제2 탱크의 하단에 체결되며, 작동유체를 제1 탱크로 회수하기 위한 작동유체 회수로; 작동유체 공급로 상에 마련되며, 제1 탱크에 저장된 작동유체를 제2 탱크에 공급하여 압축 기체 형태의 저장에너지를 생성하는 저장 펌프; 및 작동유체 회수로 상에 마련되며, 제2 탱크 내의 기체의 팽창에 의해 회수되는 작동유체의 압력으로 회전하여 전기에너지를 발생시키는 발전 터빈을 포함한다.An energy storage device according to the present invention includes a first tank for storing a working fluid in a liquid state; A second tank storing gas, and compressed or expanded by a working fluid entering and exiting the gas; One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid supply path for supplying a working fluid to the second tank; One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid recovery path for recovering the working fluid to the first tank; A storage pump provided on the working fluid supply path and supplying the working fluid stored in the first tank to the second tank to generate stored energy in the form of compressed gas; And a power turbine provided on the working fluid recovery path and rotating at a pressure of the working fluid recovered by the expansion of the gas in the second tank to generate electrical energy.
또한, 본 발명의 제1 탱크는 상부 일측이 대기 개방되어 작동유체의 공급시 또는 작동유체의 회수시 저장 탱크의 역할을 하며, 제2 탱크는 작동유체 공급로 및 작동유체 회수로의 체결부를 제외하고 밀폐 공간을 형성하여 작동유체의 출입에 따라 내부 기체 압력을 변화시키는 것을 특징으로 한다.In addition, the first tank of the present invention, the upper side is open to the atmosphere serves as a storage tank when supplying the working fluid or the recovery of the working fluid, the second tank except the fastening portion of the working fluid supply passage and the working fluid recovery passage And forming a sealed space to change the internal gas pressure as the working fluid enters and exits.
또한, 본 발명의 에너지 저장 장치는, 작동유체 공급로 상에서 저장 펌프의 양측 중 적어도 일측에 마련되며, 작동유체의 제2 탱크 공급시에만 개방되는 제1 밸브; 및 작동유체 회수로 상에서 발전 터빈의 양측 중 적어도 일측에 마련되며, 작동유체의 제1 탱크 회수시에만 개방되는 제2 밸브를 더 포함하는 것을 특징으로 한다.In addition, the energy storage device of the present invention, a first valve provided on at least one side of the both sides of the storage pump on the working fluid supply passage, the first valve is opened only when supplying the second tank of the working fluid; And a second valve provided on at least one of both sides of the power generation turbine on the working fluid recovery path, and opened only when the first tank of the working fluid is recovered.
또한, 본 발명의 제2 밸브는 작동유체 회수로 상에서 제2 탱크와 발전 터빈 사이에 형성되며, 개도를 조정하여 회수되는 작동유체의 압력 및 유량을 일정하게 유지시키는 것을 특징으로 한다.In addition, the second valve of the present invention is formed between the second tank and the power turbine on the working fluid recovery path, it characterized in that to maintain a constant pressure and flow rate of the working fluid recovered by adjusting the opening degree.
또한, 본 발명의 발전 터빈은, 회수되는 작동유체의 압력 변화 및 유량 변화가 발생하여도 일정한 전기에너지를 발생시킬 수 있도록, 가변속 제어가 가능한 동기 발전기와 인버터를 포함하여 구성되는 것을 특징으로 한다.In addition, the power turbine of the present invention is characterized in that it comprises a synchronous generator and an inverter capable of variable speed control to generate a constant electric energy even if the pressure change and the flow rate change of the working fluid to be recovered.
상기 과제의 해결 수단에 의해, 본 발명의 에너지 저장 장치는 밀폐공간의 압축 기체와 액체상태의 작동유체를 이용한 기계적 구성, 즉 양수식 에너지 저장방식과 압축공기 에너지 저장방식을 복합시킨 구성을 활용하여 에너지 저장 효율 향상시킬 수 있는 효과가 있다.By the means for solving the above problems, the energy storage device of the present invention is energy by utilizing a combination of a mechanical configuration using a compressed gas in a closed space and a working fluid in the liquid state, that is, a combination of a pumped energy storage method and a compressed air energy storage method There is an effect that can improve the storage efficiency.
또한, 본 발명의 에너지 저장 장치는 작동유체의 압력 및 유량 변화에 대응하여 일정한 전기에너지를 생산할 수 있는 효과가 있다.In addition, the energy storage device of the present invention has the effect of producing a constant electric energy in response to changes in the pressure and flow rate of the working fluid.
도 1은 본 발명의 일실시 예에 따른 에너지 저장 장치의 개략도이다.1 is a schematic diagram of an energy storage device according to an embodiment of the present invention.
도 2는 본 발명의 일실시 예에 따른 에너지 저장 장치의 에너지 저장 상태를 나타낸 도면이다.2 is a view showing the energy storage state of the energy storage device according to an embodiment of the present invention.
도 3은 본 발명의 일실시 예에 따른 에너지 저장 장치의 에너지 발생 상태를 나타낸 도면이다.3 is a view showing an energy generation state of the energy storage device according to an embodiment of the present invention.
이상과 같은 본 발명에 대한 해결하고자 하는 과제, 과제의 해결 수단, 발명의 효과를 포함한 구체적인 사항들은 다음에 기재할 실시 예 및 도면들에 포함되어 있다. 본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되어 있는 실시 예들을 참조하면 명확해질 것이다. Specific matters including the problem to be solved, the solution to the problem, and the effects of the present invention as described above are included in the following embodiments and the drawings. Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.
이하, 첨부된 도면을 참조하여 본 발명을 보다 상세히 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.
도 1 내지 도 3은 본 발명의 일실시 예에 따른 에너지 저장 장치를 설명하기 위한 도면이다. 구체적으로, 도 1은 본 발명의 일실시 예에 따른 에너지 저장 장치의 개략도이고, 도 2는 본 발명의 일실시 예에 따른 에너지 저장 장치의 에너지 저장 상태를 나타낸 도면이며, 도 3은 본 발명의 일실시 예에 따른 에너지 저장 장치의 에너지 발생 상태를 나타낸 도면이다.1 to 3 are views for explaining an energy storage device according to an embodiment of the present invention. Specifically, Figure 1 is a schematic diagram of an energy storage device according to an embodiment of the present invention, Figure 2 is a view showing the energy storage state of the energy storage device according to an embodiment of the present invention, Figure 3 is 1 is a diagram illustrating an energy generation state of an energy storage device according to one embodiment.
도 1 내지 도 3에 도시된 바와 같이, 본 발명의 일실시 예에 따른 에너지 저장 장치는, 제1 탱크(110), 제2 탱크(120), 작동유체 공급로(130), 작동유체 회수로(140), 저장 펌프(150) 및 발전 터빈(160)을 포함한다.As shown in Figures 1 to 3, the energy storage device according to an embodiment of the present invention, the first tank 110, the second tank 120, the working fluid supply path 130, the working fluid recovery path 140, storage pump 150, and power generation turbine 160.
제1 탱크(110)는 액체 상태의 작동유체를 저장한다. 또한, 제1 탱크(110)는 상부 일측이 대기 개방되어 작동유체의 공급시 또는 작동유체의 회수시 저장탱크의 역할을 하는 대기 개방형 탱크이다. 즉, 작동유체가 공급되는 경우에는 작동유체가 배출된 만큼 제1 탱크(110)의 상부에 공기가 채워지고, 작동유체가 회수되는 경우에는 유입된 만큼 제1 탱크(110)의 상부로 공기가 배출되기 때문에, 기압 변화의 방해 없이 원활한 공급 및 회수가 이루어질 수 있다. 한편, 액체 상태의 작동유체는 공급시 제2 탱크(120)의 기체를 압축시키기 위한 매개체로 사용되며, 회수시 발전 터빈(160)의 수차에 회전력을 제공하기 위하여 사용되는 것으로, 물, 오일 등 액체 상태의 유체이면 어느 것을 사용하여도 무방하다. The first tank 110 stores the working fluid in the liquid state. In addition, the first tank 110 is an atmospheric open tank in which the upper one side is opened to the atmosphere and serves as a storage tank at the time of supplying the working fluid or recovering the working fluid. That is, when the working fluid is supplied, the air is filled in the upper portion of the first tank 110 as much as the working fluid is discharged. When the working fluid is recovered, the air is supplied to the upper portion of the first tank 110 as much as the working fluid is recovered. Since it is discharged, smooth supply and recovery can be made without disturbing the air pressure change. On the other hand, the working fluid in the liquid state is used as a medium for compressing the gas of the second tank 120 at the time of supply, is used to provide a rotational force to the aberration of the power turbine 160 during recovery, water, oil, etc. Any fluid may be used as long as it is a liquid fluid.
제2 탱크(120)는 기체를 저장하며, 출입되는 작동유체에 의해 기체가 압축 또는 팽창된다. 구체적으로, 제2 탱크(120)는 작동유체 공급로(130) 및 작동유체 회수로(140)의 체결부를 제외하고 밀폐 공간을 형성하여 작동유체의 출입에 따라 내부 기체 압력을 변화시키는 것이 가능하다. 이때, 기체는 대기 중의 일반 공기를 사용할 수 있으며 필요에 따라서는 압축력과 팽창력이 우수하며, 작동유체에 용해되지 않는 기체를 사용하는 것도 가능하다.The second tank 120 stores the gas, and the gas is compressed or expanded by the working fluid coming in and out. Specifically, the second tank 120 may form an airtight space except for the fastening portions of the working fluid supply path 130 and the working fluid recovery path 140 to change the internal gas pressure according to the entry and exit of the working fluid. . At this time, the gas may use general air in the atmosphere, if necessary, excellent compression and expansion force, it is also possible to use a gas that does not dissolve in the working fluid.
작동유체 공급로(130)는 제1 탱크(110)의 작동유체를 제2 탱크(120)로 공급하기 위한 것으로, 일단이 제1 탱크(110)의 하단에 체결되고, 타단이 제2 탱크(120)의 하단에 체결된다.The working fluid supply path 130 is for supplying the working fluid of the first tank 110 to the second tank 120, one end of which is fastened to the lower end of the first tank 110 and the other end of the second tank ( 120 is fastened to the bottom.
작동유체 회수로(140)는 제2 탱크(110)의 작동유체를 제1 탱크(110)로 회수하기 위한 것으로, 일단이 제1 탱크(110)의 하단에 체결되고, 타단이 제2 탱크(120)의 하단에 체결된다.The working fluid recovery path 140 is for recovering the working fluid of the second tank 110 to the first tank 110, one end of which is fastened to the lower end of the first tank 110 and the other end of the second tank ( 120 is fastened to the bottom.
저장 펌프(150)는 작동유체 공급로(130) 상에 마련되며, 제1 탱크(110)에 저장된 작동유체를 제2 탱크(120)에 공급하여 압축 기체 형태의 저장에너지를 생성한다. 즉, 저장 펌프(150)는 잉여의 전기에너지 등으로 구동되며, 작동유체를 제2 탱크(120)의 하단으로부터 채워나가며 밀폐공간을 형성하는 제2 탱크(120) 내부의 기체를 압축시킨다. 이에 따라, 기체가 압축되며 에너지가 저장된다.The storage pump 150 is provided on the working fluid supply path 130, and supplies the working fluid stored in the first tank 110 to the second tank 120 to generate stored energy in the form of compressed gas. That is, the storage pump 150 is driven by the surplus electric energy, etc., and fills the working fluid from the lower end of the second tank 120 to compress the gas inside the second tank 120 to form a closed space. As a result, the gas is compressed and energy is stored.
발전 터빈(160)은 작동유체 회수로(140) 상에 마련되며, 제2 탱크(120) 내의 기체의 팽창에 의해 회수되는 작동유체의 압력으로 회전하여 전기에너지를 발생시킨다. 즉, 압축 기체가 팽창되는 힘에 의해 제2 탱크(120)에서 작동유체가 작동유체 회수로(140)로 밀려나가며 작동유체압을 발생시키고 이때의 작동유체압으로 터빈을 회전시키는 것이 가능하게 된다. 한편, 발전 터빈(160)은 작동유체로 물이 사용되는 경우, 수력 터빈을 사용하는 것이 바람직하다.The power generation turbine 160 is provided on the working fluid recovery path 140 and rotates at a pressure of the working fluid recovered by the expansion of the gas in the second tank 120 to generate electrical energy. That is, the working fluid is pushed out of the second tank 120 to the working fluid recovery path 140 by the force of expanding the compressed gas to generate the working fluid pressure and to rotate the turbine by the working fluid pressure at this time. On the other hand, the power turbine 160, when water is used as the working fluid, it is preferable to use a hydro turbine.
또한, 본 발명의 일실시 예에 따른 에너지 저장 장치는, 작동유체 공급로(130) 상에서 저장 펌프(150)의 양측 중 적어도 일측에 마련되며, 작동유체의 제2 탱크(120) 공급시에만 개방되는 제1 밸브(170)와, 작동유체 회수로(140) 상에서 발전 터빈(160)의 양측 중 적어도 일측에 마련되며, 작동유체의 제1 탱크(110) 회수시에만 개방되는 제2 밸브(180)를 더 포함하는 것이 가능하다. In addition, the energy storage device according to an embodiment of the present invention is provided on at least one side of both sides of the storage pump 150 on the working fluid supply path 130, and is opened only when supplying the second tank 120 of the working fluid. The second valve 180 is provided on at least one side of both sides of the power turbine 160 on the first valve 170 and the working fluid recovery path 140 to be opened only when the first tank 110 of the working fluid is recovered. It is possible to further include).
즉, 제1 밸브(170)는 작동유체의 제2 탱크(120) 공급시에 개방되어 저장 펌프(150)에 의한 작동유체 공급을 원활하게 진행시키고, 작동유체의 제1 탱크(110) 회수시에는 차단되어 작동유체 공급로(130)를 통하여 작동유체가 회수 또는 역류되는 것을 차단한다. 이에 따라, 에너지 손실을 방지할 수 있으며 저장 펌프(150)의 손상을 방지할 수 있다.That is, the first valve 170 is opened at the time of supplying the second tank 120 of the working fluid to smoothly proceed the supply of the working fluid by the storage pump 150, and at the time of recovering the first tank 110 of the working fluid. Is blocked to block the working fluid from being recovered or backflowed through the working fluid supply path 130. Accordingly, energy loss can be prevented and damage to the storage pump 150 can be prevented.
또한, 제2 밸브(180)는 작동유체의 제1 탱크(110) 회수시에 개방되어 발전 터빈(160)으로의 작동유체 공급을 원활하게 진행시키고, 작동유체의 제2 탱크(120) 공급시에는 차단되어 작동유체 회수로(140)를 통하여 작동유체가 공급 또는 역류되는 것을 차단한다. 이에 따라, 에너지 손실을 방지할 수 있으며 발전 터빈(160)의 손상을 방지할 수 있다.In addition, the second valve 180 is opened at the time of recovery of the first tank 110 of the working fluid to smoothly proceed the supply of the working fluid to the power turbine 160, and at the time of supplying the second tank 120 of the working fluid. It is blocked to block the working fluid is supplied or backflow through the working fluid recovery path 140. Accordingly, energy loss can be prevented and damage to the power generation turbine 160 can be prevented.
나아가, 제2 밸브(180) 중 작동유체 회수로(140) 상에서 제2 탱크(120)와 발전 터빈(160) 사이에 형성되는 제2 밸브는, 개도를 조정하여 회수되는 작동유체의 압력 및 유량을 일정하게 유지시키는 것이 가능하다. 이에 따라 회수시 초기에 강한 기체 압력에 의한 작동유체의 압력 및 유량이 증가하는 경우나, 말기에 약해진 기체 압력에 의한 작동유체의 압력 및 유량이 감소하는 경우에도, 발전 터빈(160)의 전측에 마련되는 제2 밸브의 개도 조절을 통하여 발전 터빈(160)에 공급되는 작동유체의 압력 및 유량을 최대한 일정하게 유지시킬 수 있다. 따라서, 발전 터빈(160)의 분당 터빈 회전량을 일정하게 유지시켜 양질의 전기에너지를 생산할 수 있으며 장치의 부하 및 손상을 최소화할 수 있다. Further, the second valve formed between the second tank 120 and the power turbine 160 on the working fluid recovery path 140 among the second valves 180 may adjust the opening degree and the pressure and flow rate of the working fluid recovered. It is possible to keep it constant. As a result, even when the pressure and flow rate of the working fluid increase due to the strong gas pressure at the time of recovery, or when the pressure and flow rate of the working fluid decrease due to the weakened gas pressure at the end, the front side of the power generation turbine 160 By adjusting the opening degree of the second valve provided, the pressure and flow rate of the working fluid supplied to the power generation turbine 160 can be kept as constant as possible. Therefore, it is possible to maintain a constant turbine revolutions per minute of the power generation turbine 160 to produce high-quality electrical energy and to minimize the load and damage of the device.
또한, 본 발명의 일실시 예에서는 제2 밸브의 개도 조절에 더하여 발전 터빈(160)이, 회수되는 작동유체의 압력 변화 및 유량 변화가 발생하여도 일정한 전기에너지를 발생시킬 수 있도록, 가변속 제어가 가능한 동기 발전기와 인버터를 포함하여 구성되는 것이 가능하다. In addition, in one embodiment of the present invention, in addition to adjusting the opening degree of the second valve, the variable speed control is performed so that the power generation turbine 160 generates constant electric energy even when a pressure change and a flow rate change of the recovered working fluid occur. It is possible to comprise possible synchronous generators and inverters.
이와 같이, 본 발명의 일실시 예에 따른 에너지 저장 장치는 밀폐공간의 압축 기체와 액체상태의 작동유체를 이용한 기계적 구성, 즉 양수식 에너지 저장방식과 압축공기 에너지 저장방식을 복합시킨 구성을 활용하여, 발전터빈에 가해지는 힘을 강하게 하여 회전력을 증가시킬 수 있으며 에너지 손실을 최대한 줄임으로써, 에너지 저장 효율 향상시킬 수 있다. 또한, 작동유체의 압력 및 유량 변화에 대응하여 일정한 전기에너지를 생산할 수 있는 장점이 있다. As such, the energy storage device according to an embodiment of the present invention utilizes a combination of a mechanical configuration using a compressed gas in a closed space and a working fluid in a liquid state, that is, a combination of a pumped energy storage method and a compressed air energy storage method. By increasing the force applied to the power turbine can increase the rotational force and by reducing the energy loss as much as possible, it can improve the energy storage efficiency. In addition, there is an advantage that can produce a constant electric energy in response to changes in the pressure and flow rate of the working fluid.
즉, 본 발명의 일실시 예에 따른 에너지 저장 장치는 양수식 에너지 저장방식과 압축공기 에너지 저장방식을 복합시킨 에너지 저장 장치로서, 도 2와 같이 구동 방식은 다단 펌프와 같은 고양정 저장 펌프를 사용하여 밀폐된 제2 탱크 내에 작동유체인 물을 채움으로써 제2 탱크 내부에 있는 공기의 압력을 증가시켜 에너지를 저장하게 된다. 이 과정을 통하여 고양정/저유량의 수력 터빈으로 구성되는 발전 터빈 구동을 위한 설계치까지 증가된 공기의 압력을 이용하여, 물을 발전 터빈의 수차로 배출함으로써 수차를 구동시켜 전기에너지를 생산하게 되며, 배출된 물은 개방된 제1 탱크에 저장되어 앞의 순환 과정을 반복하게 된다. 이에 따라, 심야전기 또는 풍력 등 재생에너지를 이용한 전기를 사용하여 에너지를 압력 형태로 저장하게 되며, 전기 과수요 상태에서의 전력 공급 등의 용도로 활용 가능하다.That is, the energy storage device according to an embodiment of the present invention is an energy storage device combining a positive energy storage method and a compressed air energy storage method, and the driving method is sealed using a high lift storage pump such as a multistage pump as shown in FIG. 2. By filling the second tank with water, which is a working fluid, the pressure of the air in the second tank is increased to store energy. Through this process, by using the increased air pressure up to the design value for driving the power generation turbine composed of high-lift / low-flow hydro turbine, the water is discharged to the power generation turbine to drive the water wheel to produce electric energy. The discharged water is stored in the open first tank to repeat the previous circulation process. Accordingly, energy is stored in the form of pressure by using electricity using renewable energy such as midnight electricity or wind power, and may be used for power supply in an electric over demand state.
또한, 저장 펌프와 발전 터빈을 따로 사용함으로써, 사용 환경, 사용자의 요구사항 등에 따라 다양한 사양의 펌프 및 터빈을 활용하여 에너지 저장 장치를 자유롭게 구축할 수 있으며, 성능면에서 전체 시스템 효율을 향상시키는데도 이점이 있다.In addition, by using a storage pump and a power turbine separately, it is possible to freely build an energy storage device by utilizing pumps and turbines of various specifications according to the use environment and user requirements, and improve overall system efficiency in terms of performance. There is an advantage.
또한, 제2 탱크 내부의 작동유체를 배출하는 과정에서 유량과 압력이 계속 변화하기 때문에 유량 및 압력 조절이 필요하므로, 압력조정 밸브(Pressure regulating valve) 및 유량조절 밸브(flow control valve)를 제2 밸브로 구성하고 수차 전단에 배치하여 이 문제를 해결할 수 있다.In addition, since the flow rate and the pressure are continuously changed in the process of discharging the working fluid inside the second tank, it is necessary to adjust the flow rate and the pressure, so that the pressure regulating valve and the flow control valve This problem can be solved by constructing a valve and placing it before the aberration.
또한, 동기 발전기 및 인버터를 활용하여 가변속 제어가 가능한 발전 터빈의 경우, 에너지 저장 장치에 다른 제어 장치를 설치하지 않더라도 배출되는 과정에서 발생하게 되는 제2 탱크 내부의 압력 및 유량에 대응하여 운행이 가능하다.In addition, in the case of a power turbine capable of variable speed control by using a synchronous generator and an inverter, even if no other control device is installed in the energy storage device, the turbine can operate in response to the pressure and flow rate in the second tank generated during the discharge process. Do.
이와 같이, 상술한 본 발명의 기술적 구성은 본 발명이 속하는 기술분야의 당업자가 본 발명의 그 기술적 사상이나 필수적 특징을 변경하지 않고서 다른 구체적인 형태로 실시될 수 있다는 것을 이해할 수 있을 것이다.As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.
그러므로 이상에서 기술한 실시 예들은 모든 면에서 예시적인 것이며 한정적인 것이 아닌 것으로서 이해되어야 하고, 본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허청구범위에 의하여 나타나며, 특허청구범위의 의미 및 범위 그리고 그 등가 개념으로부터 도출되는 모든 변경 또는 변형된 형태가 본 발명의 범위에 포함되는 것으로 해석되어야 한다.Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from an equivalent concept should be construed as being included in the scope of the present invention.

Claims (2)

  1. 액체 상태의 작동유체를 저장하는 제1 탱크;A first tank for storing a working fluid in a liquid state;
    기체를 저장하며, 출입되는 상기 작동유체에 의해 상기 기체가 압축 또는 팽창되는 제2 탱크;A second tank storing gas, and compressed or expanded by the working fluid entering and exiting the gas;
    일단이 상기 제1 탱크의 하단에 체결되고, 타단이 상기 제2 탱크의 하단에 체결되며, 상기 작동유체를 상기 제2 탱크로 공급하기 위한 작동유체 공급로;One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid supply path for supplying the working fluid to the second tank;
    일단이 상기 제1 탱크의 하단에 체결되고, 타단이 상기 제2 탱크의 하단에 체결되며, 상기 작동유체를 상기 제1 탱크로 회수하기 위한 작동유체 회수로;One end is fastened to the lower end of the first tank, the other end is fastened to the lower end of the second tank, and a working fluid recovery path for recovering the working fluid to the first tank;
    상기 작동유체 공급로 상에 마련되고, 상기 제1 탱크에 저장된 작동유체를 상기 제2 탱크에 공급하여 압축 기체 형태의 저장에너지를 생성하는 저장 펌프;A storage pump provided on the working fluid supply path and supplying the working fluid stored in the first tank to the second tank to generate stored energy in the form of compressed gas;
    상기 작동유체 회수로 상에 마련되고, 상기 제2 탱크 내의 기체의 팽창에 의해 회수되는 상기 작동유체의 압력으로 회전하여 전기에너지를 발생시키며, 가변속 제어가 가능한 동기 발전기와 인버터를 포함하는 발전 터빈;A power generation turbine provided on the working fluid recovery path and rotating at a pressure of the working fluid recovered by expansion of the gas in the second tank to generate electric energy, and including a synchronous generator and an inverter capable of variable speed control;
    상기 작동유체 공급로 상에서 상기 저장 펌프의 양측 중 적어도 일측에 마련되며, 상기 작동유체의 상기 제2 탱크 공급시에만 개방되는 제1 밸브; 및A first valve provided on at least one side of both sides of the storage pump on the working fluid supply path and opened only when the second tank is supplied to the working fluid; And
    상기 작동유체 회수로 상에서 상기 제2 탱크와 상기 발전 터빈 사이에 마련되며, 상기 작동유체의 상기 제1 탱크 회수시에만 개방되는 제2 밸브;를 포함하고,And a second valve disposed between the second tank and the power turbine on the working fluid recovery path and opened only when the first tank is recovered of the working fluid.
    상기 제2 탱크 내부의 작동유체 배출에 따른 상기 제2 탱크의 작동유체압 변화에 관계없이 일정한 전기에너지가 발생될 수 있도록, 상기 제2 밸브의 개도를 조정하여 회수되는 상기 작동유체의 압력 및 유량이 일정하게 유지되고, 회수되는 상기 작동유체의 압력 변화 및 유량 변화가 발생되더라도 상기 동기 발전기와 인버터에 의하여 일정한 전기에너지가 발생되는 것을 특징으로 하는 에너지 저장 장치.Pressure and flow rate of the working fluid recovered by adjusting the opening degree of the second valve so that a constant electric energy can be generated regardless of the change in the working fluid pressure of the second tank according to the discharge of the working fluid in the second tank Energy storage device, characterized in that the constant electrical energy is generated by the synchronous generator and the inverter even if the pressure change and the flow rate change of the working fluid to be kept constant, recovered.
  2. 제1항에 있어서,The method of claim 1,
    상기 제1 탱크는 상부 일측이 대기 개방되어 상기 작동유체의 공급시 또는 상기 작동유체의 회수시 저장탱크의 역할을 하며, 상기 제2 탱크는 상기 작동유체 공급로 및 상기 작동유체 회수로의 체결부를 제외하고 밀폐 공간을 형성하여 상기 작동유체의 출입에 따라 내부 기체 압력을 변화시키는 것을 특징으로 하는 에너지 저장 장치.The first tank has an upper side open to the atmosphere to serve as a storage tank when the working fluid is supplied or when the working fluid is recovered, and the second tank has a fastening part for the working fluid supply path and the working fluid recovery path. Except for forming an enclosed space to change the internal gas pressure in accordance with the entry and exit of the working fluid.
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