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波力発電兼エネルギー運搬船  


<Purpose>

Mining manganese crusts lying in the seabed at depths of 4,000 to 6,000 m is work under high water pressure, so enormous energy and costs are required to collect and haul up such ores. Therefore, manganese crusts are not commercially produced at present. In this system, a wave activated power generation barge equipped with our patented equipment is used to produce and transport high-pressure hydrogen gas using wave power. The high-pressure hydrogen gas that is produced by the wave activated power generation barge does not require any compressors and the system uses this gas to make it possible to mine manganese crusts at low cost without using much energy. With this system, it is possible to transport high-pressure hydrogen gas along with mined crusts.

<System outline>

The wave activated power generation barge has a horizontal water receiving plate fixed 50 to 60 m under the barge. This makes for a barge that does not roll much in the waves. As the barge does not move much, the sea level moves up and down in a tank placed in the barge, which is used to generate electricity. The generated electricity is used to electrolyze seawater in the high-pressure hydrogen production tank for which we have a patent. The produced hydrogen gas is stored in the high-pressure hydrogen tank in the barge and transported. High-pressure oxygen gas is also produced at this time. This gas is used to operate the airlift pump that allows the barge to stay in one place without having to use new energy.
In this system, another high-pressure hydrogen tank, whose gas capacity is changeable, is hung from the bottom of the barge with wires. The tank can store and discharge the produced high-pressure hydrogen gas. The volume of the hydrogen gas to be filled into this variable capacity high-pressure hydrogen tank is adjusted so that the pressure of the tank is the same as the water pressure at the current water depth. During this process, the gas capacity does not change. Therefore, if the tank is lowered to a deep seabed of 6,000 m, the gas pressure becomes approximately 600 atmospheres, but the pressure inside and outside of the tank is the same, so the tank will not break. In addition, this hydrogen gas capacity is set so that the buoyancy of the gas almost equals the weight of the tank, so the tension applied to the wires is small. Therefore, if the high-pressure hydrogen tank is pulled up under such conditions, only a small force is required to wind up the wires. Moreover, the gas will expand as the tank moves into shallower water, increasing the capacity, so the buoyancy will become much larger than the weight. If the capacity increases to its limit, as the pressure inside the tank becomes much larger than the external pressure, the high-pressure tank will burst. So when the tank is pulled up, the hydrogen gas contained in the tank must be moved to another high-pressure hydrogen tank in the barge, but with lower pressure, to keep the capacity of the high-pressure hydrogen tank being pulled up about the same as what it was before being pulled up.
The variable capacity high-pressure hydrogen tank lowered to the seabed has equipment for collecting manganese crusts and load ores. Therefore, before the high-pressure hydrogen tank loaded with ores is pulled up, the volume of high-pressure hydrogen gas is increased so that it matches the weight of the tank plus the weight of the ores and the seawater is discharged to increase the capacity of the hydrogen gas in the tank. As a result, no new energy is required to pull up the tank. In addition, when moving to a new location, after the tank has been slightly pulled up and the hydrogen gas is shifted to the other lower-pressure tank in the barge to reduce the gas capacity, the hanging high-pressure hydrogen tank with the ores can be lowered to the seabed again to continue mining. The robot arms (attachment) can crab-walk to move the tank a short distance. These characteristics make it possible to mine at low cost with low energy consumption.
Furthermore, our patent-pending “oxyhydrogen gas excavator” can be used to mine manganese crusts and other hard ores. The excavator mixes high-pressure hydrogen gas with high-pressure oxygen gas, which is produced along with the high-pressure hydrogen gas, to create oxyhydrogen gas and burns it. The high-pressure oxyhydrogen gas torch burns at high temperatures even in the high pressure seawater of the deep seabed and it can melt and break rocks on the seabed, which makes mining easy.
In order to transport mined ores, the variable capacity high-pressure hydrogen tank and its attachments are pulled up to immediately under the sea surface with the ores loaded on it. The wave activated power generation barge transports the ores along with the high-pressure hydrogen gas to a port and collects them.

Gas buoyancy lift

The energy required to electrolyze water is the same even under high pressure (Faraday's law of electrolysis), so continuously electrolyzing water in a sealed container produces high-pressure hydrogen and oxygen gas without having to compress the gases. Therefore, these gases can be sent into the deep sea even with its high-water pressure and filling an underwater tank with the gas makes the tank buoyant. In addition, if the underwater tank floats to the surface, the tank’s internal pressure becomes higher than the pressure of the surrounding seawater, so shifting the gas to another lower-pressure tank provided on the barge before the pressure of the underwater tank reaches its pressure resistance limit can prevent the tank from bursting. The underwater tank and heavy objects attached to the tank can be pulled up from the seabed in this manner and the only energy required to do so is the energy required to electrolyze water (seawater). Therefore, the use of generated hydrogen and oxygen gases for power generation and other purposes can make for an effective pull-up system. (If a gas turbine is used when hydrogen gas is shifted to a lower-pressure tank, electricity can also be generated.)
In other words, a wave activated power generation barge with a power generation capacity of 10,000 kW can produce 5.8 m of hydrogen gas at 600 atmospheres per hour, where the hydrogen gas production efficiency is 80%; which means a 1,000-m tank can be filled up in approximately 7.2 days. That is to say, 1,000 tons of tank equipment and ores can be pulled up to just under the sea surface without using extra energy.

<Structure>

High-pressure hydrogen produced in the high-pressure hydrogen production tank, which is installed in the wave activated power generation barge, flows through the high-pressure hydrogen hose wound around a winch. The hydrogen is stored in the undersea variable capacity high-pressure hydrogen tank that hangs from the barge with wires and is divided into two spaces (front and rear). Under the bottom of the tank, an excavator, a machine for collecting ores, and a chamber into which ores are loaded are installed at the ends of the robot arms. This chamber is connected to the variable capacity high-pressure hydrogen tank via a pressure-regulating valve; their structure allows seawater to get in and out.
Meanwhile, a pipe from the high-pressure hydrogen production tank is connected to the high-pressure oxygen tank in the barge. A pipe comes out from the high-pressure oxygen tank and goes to the lower section of the cylinder for fixing the horizontal water receiving plate. The pipe is used to release high-pressure oxygen gas and seawater after electrolysis into the cylinder. This cylinder has a seawater inlet toward the bottom and a seawater jet nozzle toward the top.
Moreover, the pipe that connects the high-pressure hydrogen production tank to the winch via a rotary joint (with a screw pump) has a passage selector valve. The pipe also connects the valve to the high-pressure hydrogen tank in the barge. (As another method, the high-pressure hydrogen hose can be wound up in a spiral without a rotary joint, instead of being wound around a winch. Please contact us if you want to know more details.)

<Operation>

When high-pressure hydrogen gas is produced in the high-pressure hydrogen production tank (pressure resistance: 600 atmospheres) using electricity generated by the wave activated power generation, high-pressure oxygen gas is produced as a by-product. The oxygen gas is stored in a tank (pressure resistance: approximately 10 atmospheres) and then released to the lower section of the inside of the cylinder for fixing the horizontal plate along with seawater remaining after electrolysis. As a result, this wave activated power generation barge does not roll because of the waves and is able to maintain its position thanks to the jetted seawater (airlift function) even in wind. Therefore, the variable capacity high-pressure hydrogen tank (pressure resistance: approximately 30 atmospheres), which hangs from the wave activated power generation barge with wires, and the attachment for collecting ores, which is installed onto the lower part of the tank, do not sway and can be lowered to the target position on the deep seabed. In addition, the variable capacity high-pressure hydrogen tank will not break at any depth of water as mentioned previously because the gas pressure is adjusted by releasing gas into the high-pressure hydrogen tank in the barge (pressure resistance: approximately 30 atmospheres), etc.
Furthermore, the front and rear tanks in the variable capacity tank are divided from seawater with a membrane. The hydrogen gas passage in this tank is switched based on instructions from the barge to release or fill gas in order to change the ratio of the gas capacity in the front and rear tanks and the orientation of the two tanks. Therefore, ores that were loaded near the ore inlet in the front tank can be moved to the rear tank by tilting the two tanks and rolling the ores. In addition, seawater can get in and out from the tank, so the total capacity of hydrogen gas can be changed. After mining with the excavator and collector completes, the increased capacity for hydrogen gas can be maintained and the ores can be pulled up to the sea surface using the buoyancy. At this time, even if the high-pressure hydrogen tank in the barge is full (30 atmospheres) due to transferred hydrogen gas, the pressure-regulating valves provided at the seawater outlet and inlet of the variable capacity tank and the ore chamber stop releasing seawater from the variable capacity tank when the pressure of the seawater becomes 30 atmospheres or less. Therefore, the gas capacity in the variable capacity tank and buoyancy will be maintained.

Rotary joint with a screw pump

The rotary joint used in this system is an improved type of rotary joint with screw pump for which a patent has been obtained. It is unique in that ultra-high-pressure gas does not leak even if the speed of the rotating pipe is slow. That is to say, the screw pump parts are rotated at high speed with an external motor and the high oil pressure generated prevents gas from leaking. Rubbery packing material is used on the surface of the passage in which the high-pressure gas flows in this rotary joint. When the pipe does not need to be rotated, the motor stops and the oil pressure of the rotary joint declines, but the high-pressure gas presses the packing which fills the gaps and prevents gas from leaking. In addition, if gas does leak from a gap, the pressure on the gap side becomes lower than the inside of the pipe based on Bernoulli's theorem, so the packing is pressed and the gap is closed.


 

  Patent : Japanese patent No.5713143



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


ADDRESS
 Makoto Yasukagawa, Director of Morito Senai Hospital
 8-13 Hitokita-nishi, Moniwa, Taihaku Ward, Sendai City, Miyagi Prefecture
TEL
 +81-(0)22-281-0033
FAX
 +81-(0)22-281-0585
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
 TEL:+81-(0)22-281-0033 FAX:+81-(0)22-281-0585