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Oxyhydrogen Gas Excavator  

<Purpose and features>

The excavator burns oxyhydrogen gas, which is a mixture of hydrogen and oxygen gases, uses the heat to rapidly evaporate water, and uses shock waves from such phreatic explosions to break and dig through rocks. Furthermore, we can let water melt rocks by making seawater and muddy water supercritical state under conditions of elevated temperature and pressure. By this action, this excavator uses no drill, so it can continuously operate without having to replace any bits. Under high water pressure, the pressure of oxyhydrogen gas produced by the machine becomes high, making the excavator more powerful. Therefore, the excavator is effective for drilling winzes for deep geothermal power generation and it is suited to mining hard manganese crusts in the deep sea as well as methane hydrate and other seabed resources.

<Working principle>

When the excavator is used on the seabed and manganese composite oxide is used as the anodes, the machine can produce oxygen gas from the anodes and hydrogen gas from the cathode by electrolyzing seawater. When seawater is electrolyzed under high pressure near the deep seabed, the pressure of oxygen and hydrogen gases produced and stored in the pressure container is higher than the high water pressure near the seabed. The excavator then mixes these oxygen and hydrogen gases to create high-pressure oxyhydrogen gas, sprays the gas toward mud and rocks on the bottom of sea, and ignites it. The gas even burns underwater forming a high-temperature torch. This torch uses high-pressure gas, so its energy density is higher than ordinary torches and the temperature of the burner unit is extremely high more than 2,000〜3,000℃. Therefore, the excavator can melt rocks with high heat and it can instantaneously evaporate seawater around the machine to cause phreatic explosions and generate shock waves. The action of crushing rocks on the seabed makes it possible to dig a deep hole without using a drill. In addition we can change the seawater to the super critical water under the elevated temperature and pressure more than a tipping point. After all, we can drill a deep hole even if we do not use the drill by action to melt rocks. Unlike laser drilling, this method maintains the same effect even if the area being drilled becomes opaque due to floating silt, so it is a more effective drilling method.


The cylindrical excavator has a cathode, solid polymer electrolyte membrane sandwiched between anodes (manganese composite oxide), and anodes in it. The storage tank in this excavator has a space made of bag-like membrane for storing hydrogen gas generated from the cathode surface. The tank also has an internal tank for storing oxygen gas generated from the anodes with half the capacity of that for the hydrogen gas. Seawater is filtered and taken into the space containing the anodes from outside of the excavator with a feed pump that has a check valve. The seawater first fills the space and then is released to the oxygen gas storage tank along with generated oxygen gas. Meanwhile, the hydrogen gas space, which faces the cathode, is separated by a membrane. The storage tank outside of the hydrogen gas space can take in and discharge seawater with the water pressure at its current water depth. Discharge pipes come out from the bottom of these oxygen and hydrogen gas storage tanks and are connected to the exhaust valves (gas discharge control valves) and igniter. Power is supplied to the exhaust valves and igniter from the work barge via the controller along with the power source for electrolysis and the pump.
Moreover, this cylindrical excavator is stored near the bottom of the drilling pipe and is hung from the work barge with wires.


When this excavator is used to mine manganese crusts, a single excavator is installed onto a robot arm which is attached to the variable capacity high-pressure hydrogen tank since it does not dig very deep. However, when it is used to dig deep shafts in the seabed to mine for methane hydrate, petroleum, and natural gas, this oxyhydrogen gas excavator is hung from the drilling pipe that extends from the work barge (wave activated power generation barge). Seawater (or muddy water) is sent into the pipe from the work barge pump. The seawater runs through the gaps between the pipe and the excavator and is released from the bottom of the pipe. In addition, when the machine is used to drill winzes for deep geothermal power generation using muddy water on land, it is not necessary to frequently change drill bits even though the ground temperature is high, so it is possible to reduce costs.
Water pressure is applied to this excavator when underwater, but the capacities of the hydrogen gas and oxygen gas spaces in the excavator change depending on the water pressure, so the machine can store gases with the same pressure as the water pressure. In addition, if the gas pressure in the excavator increases and all seawater is discharged, the pressure of the gas in the enclosed space further increases, exceeding the water pressure. When the gas pressure inside the excavator becomes much higher than the water pressure (a difference of 10 atmospheres or so is assumed) because of the stored gases and pulling up of the excavator, hydrogen and oxygen gases are released from the exhaust valves (gas discharge control valves), which also serve as safety valves, and the gas pressure declines, so the machine will not break at any depth of water.
When seawater after electrolysis is stored in the internal oxygen gas tank along with oxygen gas, the oxygen gas discharge control valve is set to open, so even if the pump feeds water and the volume of seawater increases, oxygen gas pushes out extra seawater from the valve. Therefore, the pressure of the internal tank’s oxygen gas space will be the same as that of the surrounding seawater (this applies to the hydrogen gas space as well). When the pressure of oxygen gas increases and oxygen is released from the oxygen gas exhaust valve, which is detected because the electrical resistance of the passage increases, etc., the controller switches the exhaust valve to a safety valve set to 10 atmospheres. After that, when seawater is further electrolyzed and gas emission from the hydrogen gas exhaust valve, which was set to 10 atmospheres, is detected, the controller stops electrolysis of seawater. At this time, the feed pump is also stopped. Seawater for electrolysis fed by the pump is filtered to prevent salt precipitation due to the high concentration and then filtered seawater flows over the anode surface. This feed pump has a check valve that prevents backflow of seawater taken into the oxygen gas space for electrolysis and prevents the tank’s internal pressure from declining. This feed pump needs to make the difference between seawater pressure and the tank’s internal pressure at least 10 atmospheres, but the flow volume is small (1.44 L of seawater is required to fill the 4-L gas spaces in the excavator with electrolyzed oxygen and hydrogen gases at 672 atmospheres), so a small pump can be used.
After the gas spaces in the excavator are filled with gases, operation of the feed pump and electrolysis are resumed based on electrical directions via the controller. The hydrogen and oxygen gas exhaust valves provided at the bottom of the excavator are set to open at the same time. Hydrogen gas and oxygen gas are mixed at a ratio of 2 to 1 and the high-pressure oxyhydrogen gas is sprayed out into the seawater with the pressure difference of 10 atmospheres. This high-pressure oxyhydrogen gas is ignited and that becomes a high-temperature torch, melting rocks at the bottom of the hole. The seawater reacting with the molten rocks, seawater around the torch, and seawater after electrolysis sprayed out along with oxygen gas rapidly evaporate and the shocks from such phreatic explosions break rocks at the bottom of the hole. Or the seawater which become the super critical water melts rocks. Then, this water and the crushed rocks are discharged to the outside of the hole along the exterior of the pipe by a stream of water, which allows the drilling pipe to continue to be lowered into the deepening hole.

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  Patent : Japanese patent No.5704589


   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
 TEL:+81-(0)22-281-0033 FAX:+81-(0)22-281-0585