HOME > Centrifugal High Pressure Hydrogen Production System 

Dual Purpose Vessel for Wave-Activated Power Generation and Energy Transportation  


For a hydrogen tank for a hydrogen vehicle, a pressure of 700 atm is becoming the mainstream.  Significant energy is necessary, however, for compression from 1 atm to 700 atm.  We then provide a hydrogen gas generation system that does not need the energy for the compression, thus contributing to the energy saving.

<System Overview>

The system has a vertical rotating shaft and two pipes attached to the side surface of the shaft.  The pipes are symmetrically provided.  One ends of the pipes are secured to the shaft.  Each pipe is filled with water.  The bottom of each pipe has electrolysis electrodes attached to it.  Generated hydrogen gas and oxygen gas are accumulated in respective two containers directly above the electrodes.  Each container has an additional narrow pipe connected to a high-pressure hydrogen gas storage tank.
Otherwise, a solid polymer electrolyte membrane on each bottom has electrolysis electrodes joined to the opposite surfaces of the membrane.  The hydrogen gas and oxygen gas are thus separately collected and stored.


Rotation of the vertical rotating shaft applies rotational acceleration to the water in the pipe like a centrifuge.  Therefore, the containers on the pipe bottom can bear large water pressure, and then the hydrogen gas and oxygen gas generated by electrolysis cannot expand.  High-pressure gas can thus be collected in the storage tank.

<Calculation of Compression Capability>

If the pipe length is r and the rotating angle velocity is ω, the rotational acceleration is rω.  In addition, as the water weight per unit volume is a density (1000 kg/m) × acceleration, the water weight at a place r m away from the rotating shaft is 1000 × rω kilogram per 1 m.  As the water pressure comes from the water weight between the place and the water surface, the water pressure at the bottom of the pipe r m away from the shaft is given by integrating the weight between 0 and r: P = ∫ 1000 × rω dr = 1000 × 1/2rω.  If, therefore, r = 10 m and ω = 40 rad/sec, for example, P = 800 × 10 Pa.  The pressure of the generated gas is thus 800 atm with 1 atm being 10 Pa.  If r = 3 m and ω = 124.7 rad/sec, the pressure of the generated gas is about 700 atm.

<How to Use the System>
(1) If the high-pressure hydrogen gas is produced at a hydrogen station, aqueous sodium hydroxide undergoes electrolysis, and if a solid polymer electrolyte membrane is used, deionized water undergoes electrolysis.  As the electrolysis is an endothermal reaction, continuous production needs heating to prevent the solution from freezing.  More specifically, the electrolysis of 1 mole water needs electric energy of 233 kJ as well as electric power for heating of about 46 kJ.  Production of 1-mole hydrogen gas per second thus needs electric power of about 279 kW.  The heating can also be performed with joule heat of the electrical resistance of an electrolyte or the like.

The volume of the hydrogen gas is 22.4 L at 1 atm.  Under unchanged temperature, the volume is 0.032 L at 700 atm because the pressure × volume is constant by the Boyle-Charles law.  In other words, a high-pressure hydrogen of 115 L can be produced in 1 hour.  Electric power necessary for the electrolysis remains unchanged regardless of water pressure by Faraday's laws of electrolysis.  Although the pipe rotation needs additional energy, the energy for rotation is unnecessary once high-speed rotation is provided as long as there is no friction loss.  Therefore, it is preferable to attach a disk-shaped cover to the rotational plane of the pipe to reduce air friction.  To take the hydrogen gas out of the rotational center, the rotating shaft is formed as a rotating cylinder through which hydrogen gas and oxygen gas pipes run.  The pipes are connected to storage tanks installed over or under the rotating cylinder via rotary joints.  In addition, continuous production needs resupply of 18 cc water per second (1.08 L/min).  The system has thus a structure in which water is externally poured into a water tank attached around the rotating cylinder and connected to the pipes filled with electrolysis liquid.
If the high-pressure hydrogen gas is produced to carry energy provided by wave activated power generation or the like as the hydrogen gas, the present system is installed in a hold.  The system can produce the high-pressure hydrogen gas as well as high-pressure oxygen gas bubbles.  An air lift pump using the buoyancy of the bubbles can cause a water flow.  The flow can provide further power generation or the propulsion force of the vessel.

<Advantages Over Conventional High Pressure Hydrogen Production Systems>
@ The case of a system when alkali water is electrolyzed does not require an expensive platinum pole. And since making them revolve at high speed once, it’s possible to producing a great deal of high-pressure hydrogen gas by compression effect of centrifugal force. Therefore production cost will be more cheaply than the past.
A When the solid polymer electrolyte membrane is used in a electrolysis cell, the rotational speed of the system can be adjusted to operate the system in a state in which similarly high pressure is applied to the opposite surfaces of the membrane.  This allows use of a thinner and wider electrolyte membrane.  Therefore, a large amount of ultrahigh pressure hydrogen gas can be produced and stored, thus increasing the speed of filling gas to hydrogen vehicles.
B In addition to the high-pressure hydrogen gas generated on the cathode side, the high-pressure oxygen gas generated on the anode side can be secondarily collected and used.  For example, the oxygen gas can be used for air-turbine power generation.  The oxygen gas can also be used, when the system is mounted on a vessel, the buoyancy of the oxygen gas bubbles can generate a water flow to provide the propulsion force of the vessel, as described above.


<Approximation of Cost Reduction Effect>

(1) For Hydrogen Gas Station
  Since there is a rise in heat with adiabatic compression in compressing 25C and 1 atm of hydrogen gas into 700 atm, from W=R/(γ-1)×(T−T),W=8.3/(1.41-1)×(298K-T)per mole,and from T/P=T/P, T=31042K.So compressing work W=622.4kJ=0.173kwh per mole.
In other words,the compression cost \1.73 if the electricity rate per 1 kwh is \10.So filling a 100 L tank with a hydrogen gas at 700 atm for a vehicle costs 100 L÷0.032 L×\1.73≒\5,406.Use of the system can save this cost.
(In this connection, the electrolysis production of this amount of hydrogen gas needs 100 ÷ 0.032 × 279 kJ ≒ 8.7 × 10 kJ.  This equals 242.2 kWh and costs \2,422).
If it is assumed that a system including a disk having a radius of 3 m and a height of 1 m with a plurality of pipes provided in the disk can perform electrolysis of 5 mole water per second using the solid polymer electrolyte membrane, a high pressure hydrogen gas of 115 L × 5 can be produced per hour.  Therefore, 138 high-pressure hydrogen tanks (at 700 atm) of 100 L for a vehicle can be produced in 24 hours.  If 100 gas tanks are filled per day, one-tank hydrogen gas is sold for \13,000, and the electrical quantity necessary for the electrolysis and the system rotation costs \3,000, \10,000 per day × 100 tanks = benefit of \1,000,000.  If, therefore, the depreciation period of the system is 5 years and the maintenance cost is \100,000,000 per five years, a system manufactured at \1,700,000,000 or less becomes profitable.

(2) For Hydrogen Gas Carrying Vessel
  If a high pressure hydrogen gas storage tank mounted on a vessel has a radius of 15 m and a length of 100 m, its capacity is 7.065 × 10 m.  As 1 mole hydrogen at 700 atm has a volume of 0.032 × 10 m, the storage tank can store about 2.2 × 10 mole of hydrogen gas.  The production of this hydrogen gas needs about 40,000 ton of fresh water, which is carried by the vessel.  The water can also be resupplied by desalting the seawater.
The compression of the hydrogen gas from 1 atm costs, like (1), \54,000 per 1 m and thus the total cost is 7.065 × 10 × \54,000 ≒ \3,780,000,000.  If a number of storage tanks are mounted on the vessel and high-pressure hydrogen gas tanks for heavy vehicles themselves are exchanged, the above cost can be saved.
In this connection, the production of this hydrogen gas needs electric power of 2.2 × 10 × 279 kJ.  A mobile wave energy harvesting having average electric generating capacity of 15,000 kW can generate power of 5.4 × 10 kJ/h, which corresponds to about 11,367 hours (1.3 years).  Therefore, the carrying vessel has an ability of storing and carrying sufficient energy.

  Patent Application : Japanese patent application No.2013-045256
  Patent        : Japanese patent No.5297567

  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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Renewable Energy Patents for Sale Makoto Yasukagawa.
8-13 Hitokita-nishi, Moniwa, Taihaku Ward, Sendai City, Miyagi Prefecture,〒982-0263,JAPAN
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