WO2019088514A1

WO2019088514A1 - New renewable energy service method and system

Info

Publication number: WO2019088514A1
Application number: PCT/KR2018/012216
Authority: WO
Inventors: 신지영; 김건태; 주상욱
Original assignee: 숙명여자대학교 산학협력단; 울산과학기술원
Priority date: 2017-11-06
Filing date: 2018-10-17
Publication date: 2019-05-09
Also published as: KR20190051178A

Abstract

The present invention relates to a method and a system for efficiently storing and using new renewable energy. According to the present invention, provided is a new renewable energy service method comprising: an electrical energy production step of producing electrical energy by using new renewable energy; a hydrogen production step of producing hydrogen by using the electrical energy produced in the electrical energy production step; an ammonia production step of producing ammonia from the hydrogen produced in the hydrogen production step; a storage step of storing the ammonia produced in the ammonia production step; and a delivery step of delivering and supplying, to a place requiring energy, the ammonia stored in the storage step.

Description

New Renewable Energy Service Method and System

The present invention relates to a renewable energy technology, and more particularly, to a service method and a system for efficiently storing and utilizing renewable energy.

Generally, renewable energy such as solar, wind, and geothermal has a problem of intermittency. To solve this problem, renewable energy is converted into another type of energy and stored.

There are two methods of storing renewable energy: a method of converting new renewable energy into electric energy and storing it, and a method of converting it into chemical energy such as hydrogen. In recent years, researches on the technology of converting renewable energy into hydrogen have been actively carried out. Since it requires a high technology to manufacture liquefied hydrogen and a storage facility capable of withstanding high pressure and high cost, There is a problem that practicality is low in transportation.

It is an object of the present invention to provide a new renewable energy service method and system that is easy to store and transport renewable energy and has improved usability.

Another object of the present invention is to provide a new renewable energy service method and system capable of economically and safely storing and transporting renewable energy.

According to an aspect of the present invention, there is provided a method of manufacturing an electric power generating apparatus, including: an electric energy producing step of producing electric energy using renewable energy; A hydrogen producing step of producing hydrogen using electric energy produced through the electric energy producing step; An ammonia producing step of producing ammonia from the hydrogen produced through the hydrogen producing step; A storage step of storing the ammonia produced through the ammonia production step; And a transporting step of transporting and storing the ammonia stored in the storing step to an energy demanding place.

According to another aspect of the present invention, there is provided a method of manufacturing an electric energy generating apparatus, comprising: an electric energy production step of generating electric energy by an electric energy production unit that generates electric energy using renewable energy; A hydrogen production step in which hydrogen is produced by a hydrogen production unit that produces hydrogen using the produced electric energy; An ammonia producing step in which ammonia is produced by an ammonia producing unit that produces ammonia from the produced hydrogen; A storage step of storing the ammonia aqueous solution by the ammonia storage part storing the produced ammonia in the form of an aqueous ammonia solution; And transporting the ammonia aqueous solution to the energy demanding place by a transportation means for transporting the stored ammonia aqueous solution to an energy demanding place.

According to another aspect of the present invention, there is provided an electric energy production system, comprising: an electric energy producing unit for producing electric energy using renewable energy; A hydrogen producing unit for producing hydrogen using the produced electric energy; An ammonia production unit for producing ammonia from the produced hydrogen; An ammonia storage unit for storing the produced ammonia; And a conveying means for conveying the stored ammonia to an energy receiving place.

According to another aspect of the present invention, there is provided an electric energy production system, comprising: an electric energy producing unit for producing electric energy using renewable energy; A hydrogen producing unit for producing hydrogen using the produced electric energy; An ammonia production unit for producing ammonia from the produced hydrogen; And an ammonia storage unit for storing the produced ammonia in the form of an aqueous ammonia solution; And a conveying means for conveying the ammonia aqueous solution stored in the ammonia storage portion to an energy receiving place.

According to the present invention, hydrogen is produced using electric energy produced by renewable energy, and the produced hydrogen is converted into an ammonia or ammonia aqueous solution which is easy to store and transport, is stored and transported to an energy demand site, Or fuel of the fuel cell, so that the utility of renewable energy can be remarkably improved.

FIG. 1 is a flowchart illustrating a method of providing renewable energy according to an embodiment of the present invention. Referring to FIG.

2 is a block diagram illustrating an embodiment of a system for performing the renewable energy service method shown in FIG.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a flowchart illustrating a method for providing a renewable energy according to an exemplary embodiment of the present invention. Referring to FIG. 1, a method for providing renewable energy according to an embodiment of the present invention includes a step S10 of producing electrical energy using new and renewable energy, a step S10 of producing electrical energy, (S30) for producing ammonia from the hydrogen produced through the hydrogen production step (S20), and an ammonia production step (S30) for producing ammonia A storage step S40 for storing the produced ammonia; a transfer step S50 for transferring the ammonia stored in the storage step S40 to the energy consumer; and a transfer step S50 for transferring the ammonia transferred to the energy demand place to hydrogen , And a fuel cell application step (S70) of supplying ammonia, which has been transferred to the energy consumer through the transportation step (S50), to the fuel of the fuel cell.

In the electric energy production step (S10), electric energy is produced using renewable energy. The renewable energy used in the production of electric energy in the electric energy production step (S10) includes all conventional renewable energy that can be used for the production of electric energy such as solar, wind, geothermal, tidal, and wave power. In the electric energy production step (S10), electric energy can be produced by conventional photovoltaic generation, wind power generation, geothermal power generation, tidal power generation, and wave power generation, and a detailed description thereof will be omitted. The electric energy produced through the electric energy production step S10 is used for performing the hydrogen production step S20.

In the hydrogen production step S20, hydrogen is produced using the electric energy produced through the electric energy production step S10. However, in addition to the electric energy produced through the electric energy production step (S10), electricity produced by another electricity generating device may be additionally or supplementally used. In the hydrogen production step (S20), hydrogen is produced through electrolysis of water, and electric energy produced through an electric energy production step (S10) using renewable energy is used as electric energy required for electrolysis reaction of water. The electrolysis reaction formula of water is shown in the following formulas (1) and (2).

Formula 1 is an oxidation reaction occurring at an anode, and Formula 2 is a reduction reaction occurring at a reducing electrode. In this embodiment, it is explained that the production method of hydrogen used in the hydrogen production step S20 is electrolysis of water. Alternatively, all of the hydrogen production methods using electric energy produced through the production of electric energy S20 Are included in the invention.

Hydrogen produced through the hydrogen production step (S20) is used for ammonia production in the ammonia production step (S30). In the prior art, produced hydrogen is sent to a storage facility and stored. Since hydrogen has a melting point of -259.14 ° C and a boiling point of -252.87 ° C, it requires considerable skill and cost in the process of making liquefied hydrogen for storage. However, since the hydrogen produced through the hydrogen production step (S20) is directly used in the ammonia production step (S30) in the present invention, a facility for making and storing liquefied hydrogen is not required. That is, the hydrogen gas produced through the hydrogen production step (S20) is directly used in the ammonia production step (S30) without the liquefaction process or the storage process.

In the ammonia production step (S30), ammonia is produced using hydrogen produced in the hydrogen production step (S20). That is, the ammonia is produced using the hydrogen gas produced in the hydrogen production step (S20). For the ammonia synthesis method used in the ammonia production step (S30), Harbor-Bosch method developed by Fritz Harbor and Karl Bosch can be used. The following formula (3) is an ammonia synthesis reaction formula according to the Harbor-Bosch method.

In the ammonia synthesis reaction based on the Harbor-Bosch method, when the reaction rate is increased by increasing the temperature, there is a problem that the reaction equilibrium is lost at a certain temperature and the yield is lowered. Therefore, the reaction equilibrium is shifted toward the reaction side by using the high pressure, Is preferably synthesized. The present invention is not limited to the Harber-Bosch method, and the ammonia synthesis method used in the ammonia production step (S30) may include all other methods capable of synthesizing ammonia from hydrogen.

The ammonia produced through the ammonia production step (S30) is stored through the storage step (S40). That is, renewable energy is stored in the form of ammonia energy.

In the storage step S40, the ammonia gas produced through the ammonia production step S30 is liquefied and stored. The melting point and boiling point of ammonia are -77.7 ° C and -33.4 ° C, respectively. The ammonia gas can be liquefied relatively easily when compressed at room temperature and can be stored at about 20 atm. Which is superior in storage and transportability.

Ammonia stored and stored through the storage step (S40) is transported to and supplied to the energy consumer through the transportation step (S50).

In the transporting step (S50), the ammonia stored through the storing step (S40) is carried to the energy consumer. The ammonia transferred to the energy consumer through the transporting step S50 is converted into hydrogen through the hydrogen recycling step S60 or supplied to the fuel cell fuel through the fuel cell applying step S70. In the transporting step (S50), ammonia may be stored in a transport container and the transport container may be transported using a transportation means such as a vehicle. Alternatively, ammonia stored in the storage step (S40) may be transported to a customer It is also possible to carry it.

In the hydrogen re-conversion step (S60), the ammonia transferred to the energy consumer through the transportation step (S50) is converted back to hydrogen from the energy consumer. Ammonia can be converted back to hydrogen through electrolysis at the energy consumer. The energy required for electrolysis of ammonia for hydrogen recycle is much less than the energy required for electrolysis of water. To produce hydrogen through electrolysis of water requires 33 watts per kilogram, but when producing hydrogen through electrolysis of ammonia, only 1.55 watts of energy per kilogram is needed. In the hydrogen re-conversion step (S60), liquefied ammonia is vaporized by heating and / or decompression, and then decomposed into a mixed gas of hydrogen and nitrogen using various known methods, and hydrogen gas alone Separate. Separated hydrogen can be used in various applications such as hydrogen fuel cells.

In the fuel cell application step (S70), ammonia transferred to the energy consumer through the transportation step (S50) is supplied as the fuel of the fuel cell. The transported liquefied ammonia is first heated and / or depressurized and vaporized. The gaseous ammonia can be used directly in a fuel cell using ammonia as fuel. That is, ammonia is supplied to the fuel electrode of the fuel cell and decomposed into nitrogen and hydrogen by the catalytic reaction. The decomposed hydrogen is quantized and travels along the electrolyte to the cathode. The catalytic reaction of ammonia in the fuel cell is represented by the following chemical formula (4).

According to the present invention, a renewable energy service system for performing the renewable energy service method shown in FIG. 1 is provided.

FIG. 2 is a block diagram of a renewable energy service system according to another embodiment of the present invention. Referring to FIG. 2, a new and renewable energy service system 100 according to an embodiment of the present invention includes an electric energy production unit 110 for producing electric energy using renewable energy, An ammonia production unit 130 for producing ammonia from a water channel produced by the hydrogen production unit 120 and an ammonia production unit 130 for producing ammonia produced from the ammonia production unit 130. The hydrogen production unit 120 generates hydrogen using the produced electric energy, And ammonia transporting means 150 for transporting ammonia stored in the ammonia storage portion 140 to an energy demanding place and ammonia transported to the energy demanding place through the ammonia transporting means 150, The ammonia transporting unit 150, and the ammonia transporting unit 150. The ammonia transporting unit 150 converts the ammonia transported from the hydrogen- And a supply unit 170.

The electric energy production unit 110 generates electric energy by using renewable energy such as sunlight, wind power, geothermal power, tidal power, and wave power. To this end, the electric energy production unit 110 includes conventional renewable energy generation means such as a solar power generator, a wind power generator, a geothermal generator, a tidal generator and a wave generator. 1 is performed by the electric energy production unit 110 and the electric energy produced by the electric energy production unit 110 is supplied to the hydrogen production unit 120 to be used as electric energy Is used.

The hydrogen producing unit 120 receives the electric energy produced by the electric energy producing unit 110, and electrolyzes the water to produce hydrogen. The hydrogen production step (S20) shown in FIG. 1 is carried out by the hydrogen production unit 120. In the present embodiment, the electrolysis of water is used to produce hydrogen, but the present invention is not limited thereto, and various other methods other than electrolysis of water can be used. A feature of the present invention is that electric energy required for producing hydrogen is produced using renewable energy. The hydrogen produced in the hydrogen production unit 120 is supplied to the ammonia production unit 130 and used for ammonia production.

The ammonia production unit 130 synthesizes ammonia from hydrogen produced in the hydrogen production unit 120 to produce ammonia. The ammonia production step (S30) shown in FIG. 1 is performed by the ammonia production part (130). In this embodiment, the ammonia production method used in the ammonia production unit 130 is described as being based on the Harbor-Bosch method, but the present invention is not limited thereto. The ammonia produced in the ammonia production unit 130 is stored in the ammonia storage unit 140.

The ammonia storage unit 140 stores the ammonia produced in the ammonia production unit 130 in the form of an aqueous solution. The ammonia storage unit 140 performs the storing step S40 shown in FIG. In addition to storing ammonia in the form of an aqueous solution, the ammonia storage unit 140 may store liquefied ammonia gas. In this case, since ammonia can be relatively easily liquefied when it is compressed even at room temperature, The ammonia storage unit 140 can store renewable energy much more economically than the storage facility. The ammonia stored in the ammonia storage unit 140 is carried to the energy consumer by the transportation means 150.

The conveying means 150 conveys the ammonia stored in the ammonia storage portion 140 to the energy consumer. The carrying step S50 shown in Fig. 1 is carried out by the carrying means 150. Fig. The transportation means 150 may be a transportation means such as a vehicle for transporting ammonia stored in a transportation container to an energy demanding place. Alternatively, the transportation means 150 may be a transportation pipe connecting the ammonia storage portion 140 and an energy demanding place.

The ammonia stored in the ammonia storage part 140 by the conveying means 150 is conveyed to the energy demanding site and is conveyed to the hydrogen re-changing part 160 or the fuel cell fuel supplying part 170 installed in the energy demanding place.

The hydrogen re-conversion unit 160 converts the ammonia aqueous solution, which is transported and supplied by the transportation means 150, to hydrogen. That is, in the hydrogen re-switching unit 160, hydrogen is produced from the aqueous ammonia solution by a known method (heating, electrolysis, etc.).

The fuel cell fuel supply unit 170 supplies the aqueous ammonia solution, which is transported and supplied by the transportation means 150, as fuel to the fuel cell in the form of ammonia gas. Various processes such as fractional distillation can be selected as the process for converting the aqueous ammonia solution into ammonia gas. Using the generated ammonia gas, the fuel cell application step (S70) shown in FIG. 1 is performed.

In the above description, it is described that the renewable energy is used to produce electric energy. However, the present invention is not limited to the renewable energy, but may be applied to an electric generator in which electric energy is generated intermittently in structure, But also includes an electricity generating device in which electric energy is generated intermittently in consideration of operating conditions. Further, as occasion demands, it is possible to use an electricity generating device that continuously generates electric energy.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

By using the present invention, it is possible to construct a new and renewable energy service method and system that is easy to store and transport new and renewable energy and has improved usability.

Claims

Electric energy production stage to produce electric energy using renewable energy;

A hydrogen producing step of producing hydrogen using electric energy produced through the electric energy producing step;

An ammonia producing step of producing ammonia from the hydrogen produced through the hydrogen producing step;

A storage step of storing the ammonia produced through the ammonia production step; And

And transporting the ammonia stored in the storing step to an energy demanding site for supply.
The method according to claim 1,

And a hydrogen re-conversion step of re-converting the ammonia supplied to the energy demanding party into hydrogen.
The method of claim 2,

Wherein the hydrogen re-conversion step converts ammonia to hydrogen by electrolyzing ammonia.
The method according to claim 1,

And a fuel cell application step of supplying ammonia supplied to the energy consumer as fuel of the fuel cell.
The method according to claim 1,

Wherein the hydrogen producing step produces hydrogen by electrolyzing water using electric energy produced in the electric energy producing step.
An electrical energy production stage in which electrical energy is produced by an electrical energy production unit that produces electrical energy using renewable energy;

A hydrogen production step in which hydrogen is produced by a hydrogen production unit that produces hydrogen using the produced electric energy;

An ammonia producing step in which ammonia is produced by an ammonia producing unit that produces ammonia from the produced hydrogen;

A storage step of storing the ammonia aqueous solution by the ammonia storage part storing the produced ammonia in the form of an aqueous ammonia solution;

Wherein the ammonia aqueous solution is transported to the energy demanding place by a transportation means that transports the stored ammonia aqueous solution to an energy demanding place.
The method of claim 6,

A hydrogen re-conversion step of re-converting the aqueous ammonia solution into hydrogen by a hydrogen re-conversion unit for re-converting part of the ammonia aqueous solution transferred to the energy demanding party to hydrogen; And

Further comprising a fuel cell applying step of generating ammonia gas by using a part of the ammonia aqueous solution carried to the energy demanding place by the fuel cell supplying part and directly supplying the generated ammonia gas as fuel of the fuel cell, Energy service method.
The method of claim 7,

Wherein the hydrogen re-conversion step converts ammonia to hydrogen by electrolyzing ammonia.
The method of claim 6,

Wherein the hydrogen producing step produces hydrogen by electrolyzing water using electric energy produced in the electric energy producing step.
An electrical energy production unit that produces electrical energy using renewable energy;

A hydrogen producing unit for producing hydrogen using the produced electric energy;

An ammonia production unit for producing ammonia from the produced hydrogen; And

An ammonia storage part for storing the produced ammonia in the form of an aqueous ammonia solution;

And a conveying means for conveying the ammonia aqueous solution stored in the ammonia storage portion to an energy receiving place.
The method of claim 10,

A hydrogen re-conversion unit for re-converting a part of the ammonia aqueous solution transferred to the energy receiving place into hydrogen; And

Further comprising a fuel cell fuel supply unit for producing an ammonia gas using a part of the aqueous ammonia solution transported to the energy storage destination and directly supplying the ammonia gas as fuel for the fuel cell.
The method of claim 11,

And the hydrogen re-conversion unit converts ammonia into hydrogen by electrolyzing ammonia.
The method of claim 11,

The hydrogen producing unit generates hydrogen by electrolyzing water using electric energy produced by the electric energy producing unit.