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Hitachi Zosen Corporation and Hitachi Zosen Inova to build first joint Power-To-Gas plant in Japan

Swiss clean-tech company Hitachi Zosen Inova and its parent company Japan-headed Hitachi Zosen Corporation are to deliver the technology for a Power-to-Gas (PtG) plant project in Japan, which will in future produce synthetic natural gas (methane) from carbon dioxide (CO2) and hydrogen (H2).

ETOGAS has built the world's first and largest industrial Power-to-Gas (PtG) plant in Werlte, Germany on behalf of Audi AG. The 6.3 MW power input plant has been producing Audi's e-gas since 2013 in dynamic and intermittent operation using wind power and CO2 from a biogas plant (photo courtesy ETOGAS).

ETOGAS has built the world’s first and largest industrial Power-to-Gas (PtG) plant in Werlte, Germany on behalf of Audi AG. The 6.3 MW power input plant has been producing Audi’s e-gas since 2013 in dynamic and intermittent operation using wind power and CO2 from a biogas plant. HZI acquired ETOGAS in 2016 to form HZI EtoGas  (photo courtesy ETOGAS).

As part of Japan’s efforts to bring about a long-term reduction in its existing CO2 emissions, the country’s first Power-to-Gas plant (PtG) of its kind is to be built within the next 18 months. Instead of being emitted directly, the carbon dioxide (CO2) of an existing coal-fired thermal power station will be captured and effectively used for the production of synthetic natural gas (SNG).

The turnkey contract for the plant has been awarded to the Japanese firm Hitachi Zosen Corporation (HZC) together with its Swiss subsidiary Hitachi Zosen Inova (HZI). Both companies have profound experience in the engineering and construction of PtG plants.

The client, New Energy and Industrial Technology Development Organization (NEDO), is active in the evaluation of technological solutions to produce SNG using CO2 from coal and has entrusted HZC to develop technologies to effectively use CO2. It is the objective of this test facility to prove the feasibility of large-scale PtG plants.

A future technology

The aim of the PtG technology, to be developed by HZC and HZI, is to balance the supply and demand for power in electricity networks with renewable energy. To do this, SNG is produced using excess electricity and this can be stored to be used as a carbon-free vehicle fuel or transformed back into power and fed into the grid to compensate in times of peak demand.

The new facility to be built in Japan will take fossil CO2 emissions and combine them with hydrogen to produce SNG which will then be fed into an existing gas grid. Acting as general contractor HZC will deliver a proton exchange membrane (PEM) electrolyzer, which produces hydrogen from electricity and water.

In addition to the EtoGas catalytic reactor for the methanation process, HZI will deliver tried-and-tested plate reactors specially adapted to handle different CO2 sources. This process facilitates active decarbonization of the gas grid, thus making an important contribution to a CO2-free economy.

This PtG technology has considerable potential to become a key mainstay of a CO2-neutral future, saidWolfgang Beez, CEO, HZI EtoGas.

This marks the first joint project for both companies in the PtG area and represents a major step with regard to further developments. This pilot project in Japan will be commissioned in 2018/19.

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