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Japán most fejezte be egy hatalmas mélytengeri árapály-turbina tesztelését

Időbélyeg: 22. június 2022. 10:00
tidal turbine Japan energy ocean currents

A little over a year ago, a Scottish company called Orbitális tengeri erő was getting a two-megawatt árapály turbina up and running in the North Sea. The system várható volt to generate enough electricity to power around 2,000 Scottish homes and offset 2,200 tons of CO2 annually.

Meanwhile, a similar system called the Kairyu was already in the water off the coast of Japan, undergoing a trial that lasted over three years. The trial was deemed a success, and detailed in a report published by Bloomberg ezen a héten.

Az árapály-turbinák lényegében a szélturbinák víz alatti változatai, amelyek nagyjából ugyanúgy működnek; a víz mozgása elfordítja a forgórészhez rögzített lapátokat, forgatja a rotort és táplálja a generátort.

A legnagyobb árapály-erőmű a világon a dél-koreai Sihwa Lake állomás, amely 254 megawatt (MW) kapacitással rendelkezik, ezt követi egy 240 MW-os állomás a franciaországi La Rance-ben (ez egyben a világ legrégebbi árapály-erőműve, 1961-1966 között épült).

Mindkét üzem úgynevezett duzzasztóművet használ, amely egy hosszú víz alatti fal (a vízlépcső a víz alatt La Rance üzempéldául 476 láb hosszú), és a kapuk az árapályral együtt nyílnak és záródnak oly módon, hogy kiaknázzák energiatermelési potenciáljukat. Ez a beállítás jól működik nagy mennyiségű energia előállításához több turbinával; A Sihwa Lake 10, a La Rance pedig 24 turbinával rendelkezik.

Kairyu works a little differently. The system is made up of three connected cylindrical pods. The middle pod, which sits several feet higher than those on either side, holds a connector for the power transmitter as well as a device to adjust buoyancy—that is, to enable the array to move to deeper or shallower water and thus capitalize on variations in the current’s strongest spots.

Japán most fejezte be a hatalmas mélytengeri árapály-turbina PlatoBlockchain adatintelligenciájának tesztelését. Függőleges keresés. Ai.
Overview of Kairyu 100 kW-class demonstration system. Image Credit: IHI Corporation

The pods on either side both have turbine blades on one end that are 36 feet long, and they rotate in opposite directions to stabilize the generator’s position underwater. They also each contain a generator, a controller, and various measurement instruments.

Kairyu will be anchored to the seafloor, with its pods floating about 160 feet below the water’s surface. The system will sit along the Kuroshio current, one of the largest óceáni áramlatok in the world. It starts east of the Philippines and flows north-east past Taiwan and Japan. Oceanographer Steven Jayne leírta as “the strongest current in the Pacific Ocean, and also one of the most intense air-sea heat exchange regions on the globe. It influences climate as far as North America.”

The current flows at a rate of 2.5 meters (8.2 feet) per second, and Kairyu’s trial period showed that the tidal turbine system could steadily generate 100 kilowatts of power (50 per turbine unit) with a rate flow speed of three knots (that’s about 3.45 tengeri mérföld per hour). Japan’s New Energy and Industrial Technology Development Organization becslések this current could generate up to 200 gigawatts of reliable energy.

Being an island nation, it seems only logical that Japan should harness ocean currents for energy; according to Ken Takagi, a professor of ocean technology policy at the University of Tokyo Graduate School of Frontier Sciences, there’s more potential for tidal turbine power than offshore wind in the area. “Ocean currents have an advantage in terms of their accessibility in Japan,” he mondta Bloomberg. “Wind power is more geographically suited to Europe, which is exposed to predominant westerly winds and is located at higher latitudes.”

The Japanese are hoping tidal power will be a significant contributor to the country’s renewable energy stock and help it meet its nettó nulla szén-dioxid-kibocsátás target by 2050. Building the submerged transmission lines that will carry the energy Kairyu generates to the grid will be no small project, but the tidal turbine is expected to be up and running in the next decade.

Image Credit: IHI Corporation

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