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We have a “high-pressure reversible Fuel cell “which is an apparatus enabling production of huge amount of hydrogen and is used as very efficient Fuel cell utilizing high pressure hydrogen in the tank and high temperature operation. This patent belongs to our company. Followings are three applications of our apparatus.
(1) Fuel cell with no need for hydrogen station

 High pressure hydrogen gas can be filled using city water and domestic electricity, when parking a car in your parking space in your house, without hydrogen gas station, with this apparatus. So, Fuel cell vehicle can be usable in area or country without hydrogen gas station.

(2) On-site type mobile hydrogen gas station

 A big truck loaded with high pressure reversible fuel cell can be a mobile hydrogen gas station, when high pressure storage device and dispenser are additionally loaded. This apparatus can produce high pressure hydrogen gas on site without using booster pump. So the apparatus could be small with reasonable cost. If this apparatus with high pressure reversible fuel cell move around several parking lots which have electrical equipment and city water, hydrogen gas filling demand around the area would be satisfied. And high-speed filling by difference of pressure between the apparatus and the tank in the car, will be continued because the apparatus can be filled with high pressure hydrogen gas at site. Also, delivery of hydrogen gas can be done for people who can not go to the parking or the site.

(3) Transportation of electric energy and re-generation of electricity at the place

 Electric energy produced by PV or Wind in the area where there is no electric power transmission line, small island or dessert, can be changed to high pressure hydrogen gas and stored. The stored high pressure hydrogen gas can be changed to electricity where needed. This transportation can be done by ships as well as trucks, which vehicles are thought as holding electric generator.
 In case of transporting high pressure hydrogen gas on ships, the pressure to produce hydrogen gas should not be so high, because big tanks can be transported on ships. When electrolysis occurs, high pressure pure oxygen gas also would be produced, which should be stored and used at chemical reaction to produce electricity.
 Also, high pressure hydrogen gas which was produced from excessive electricity of PV or wind could be stored in big tank at the place which is not so high pressure as ships.

<Outline of Apparatus>
(1) Production of high-pressure hydrogen gas

 This apparatus has a multiplicity of water electrolyzing cells using the solid polymer electrolyte membrane as that conventionally used.  The water electrolyzing cells are laterally arranged in a high-pressure tank to enable producing a large amount of hydrogen by electrolysis.  As a result of accumulation of a large amount of hydrogen in the tank, the pressure in the tank becomes high.  However, as long as flowing of the current is continued, hydrogen gas is produced in accordance with the Faraday's laws of electrolysis no matter how high the pressure is.  Therefore the pressure of hydrogen gas can be increased to the tank pressure resistance limit.  This apparatus is designed so as to be smaller in size.  Therefore the high-pressure gas is stored in a conventional high-pressure hydrogen tank (70 MPa) mounted on a motor vehicle to secure the amount of hydrogen gas charge necessary for travel through a long distance.
 A high-pressure pump is attached to this apparatus.  As in the case of the "high-pressure hydrogen producing tank", high-pressure hydrogen gas is produced by feeding the water electrolyzing cells with city water and the current for electrolysis by using a water service and a power supply, for example, in a house parking space.  In this process, there is no possibility of the solid polymer membrane being broken since the pressure of water injected by the high-pressure pump and the pressure in the tank are kept substantially equal to each other by a pressure control valve.  This pressure control valve on the high-pressure pump side also functions as a check valve for preventing backflow of water and generated oxygen gas during stoppage of the high-pressure pump.  A mechanism is provided in which when the pressure in the tank becomes close to the pressure resistance limit, a safety valve is opened to reduce the pressure.  A hydrogen gas sensor is attached to the safety valve.  When the sensor detects discharge of hydrogen gas, a signal is sent to a controller to stop the electrolysis current and the high-pressure pump.  Because of the structure for flowing hydrogen gas from this apparatus into the high-pressure hydrogen tank mounted on the hydrogen vehicle, the safety valve is opened only after the high-pressure hydrogen tank is fully charged.
 City water injected into this apparatus by the high-pressure pump is consumed by electrolysis.  Also, with the transfer of hydrogen ions, part of the city water permeates into the hydrogen storage space by passing through the solid polymer electrolyte membrane.  Therefore the amount of city water is set about several times the amount required for electrolysis in order to prevent failure such as membrane failure due to concentration of impurities in the city water.  A pipe communicating with the safety valve is provided in contact with a bottom portion of the tank to discharge wafer staying at the bottom of the tank.  When hydrogen gas is discharged after the completion of discharge of this water, the above-described detection with the sensor is performed.

(2) Fuel cell operation

 The internal space of the apparatus and the high-pressure hydrogen tank can be filled with high-pressure hydrogen gas in the above-described way.  When the hydrogen vehicle is caused to run by using the hydrogen gas as fuel, not water but air (oxygen) is injected into the apparatus with the high-pressure pump.  At this time, air injected through a passage diverter valve flows in from above the water electrolyzing cells, and water formed by hydrogen gas and oxygen gas and the remaining air are discharged below the cells.  Therefore this reaction is sustained.  In this process, the water electrolyzing cells are used as fuel cells in the apparatus and there is no possibility of the solid polymer membrane being broken since the pressure in the apparatus and the pressure of injected air are kept substantially equal to each other by the action of the pressure control valve.
 The fuel cells are operated in a state where a flow control valve is closed, and the hydrogen gas pressure can be reduced by consuming hydrogen gas in the apparatus tank or releasing hydrogen gas through the safety valve, thus enabling the fuel cells to operate while constantly maintaining the hydrogen gas pressure by flow rate control.  Since the pressure of air injected can also be kept low in this state, the energy necessary for compression of air can be reduced.  The temperature in the fuel cell is adjustable by sending cool water into the stuck of fuel cell and radiator. It is, therefore, desirable to minimize gaps in the tank of the apparatus by filling the gaps with filler or the like.

(3) Improvement in power generation efficiency

 In this apparatus, the fuel cells can be operated while the hydrogen gas pressure in the apparatus is maintained at a certain high pressure by flow rate control.  The boiling point of water can be increased under this high-pressure condition.  It is, therefore, possible to avoid evaporation of water in the solid polymer electrolyte membrane even at 150°C when the pressure is 5 atm, thus enabling operation at high temperatures.  The power generation efficiency can be improved in comparison with ordinary operation at 80 to 90°C by improving the ionic conduction.  In this case, since the air fed into the apparatus by the high-pressure pump is expanded by heat generated from the fuel cells, a small turbine may be provided in the discharge tube from the apparatus to also generate power in this place.


<High-pressure hydrogen gas production cost and fuel cost reduction effects>
 If the price at 1 kwh is 15 yen, hydrogen gas can be provided at about 53 yen/Nm on the same basis for calculation as that for rough estimation of balance on the patented apparatus "high-pressure hydrogen producing tank" placed on the website, and a 100-liter tank can be fully charged at 3,710 yen.  If the power generation efficiency is improved from 35% in ordinary cases to 40% by using the "high-pressure reversible fuel cell", the amount of hydrogen gas required per distance traveled can be reduced by 10% or more.  Therefore, even if this apparatus is high-priced in comparison with the conventional fuel cells, about 370 yen can be recovered per charge by the fuel cost reduction effect.
<Outline of Trial unit>
Pressure resistant 10atm
electrolysis ability 30V X 40A =1200W (5.4L/min of 1atm hydrogen)
Fuel cell power generation 500W
Please ask contact person of our company for details.

  Patent        : Japanese patent No.2015-154798

   If you require more details, please contact us using the information below:

 Makoto Yasukagawa, Director of Morito Senai Hospital
 8-13 Hitokita-nishi, Moniwa, Taihaku Ward, Sendai City, Miyagi Prefecture
E-MAIL  rijityou@midorijuji.or.jp


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Copyrights © 2010- Renewable Energy Patents for Sale YASUKAGAWA. All Rights Reserved.
Renewable Energy Patents for Sale Makoto Yasukagawa.
8-13 Hitokita-nishi, Moniwa, Taihaku Ward, Sendai City, Miyagi Prefecture,〒982-0263,JAPAN
 TEL:+81-(0)22-281-0033 FAX:+81-(0)22-281-0585