Waste plastic is constantly in the news and many argue that instead of shovelling it into landfill sites, why not recycle it into clean hydrogen fuel that’s so pure it can be used to power road transport, including cars?
DMG is a thermal conversion process that turns waste materials into gas by exposing them to intense heat but not in the presence of oxygen . In this case, mixed and shredded but not necessarily clean plastic waste that would otherwise be headed for landfill is added to a chamber heated to around 1000deg C, where it instantly melts and ‘gasifies’.
Syngas can be burned in gas engines and, in that form, 25 tonnes of shredded plastic can be used to generate 2.8MWh of electricity, but the preference is to separate the hydrogen from it using another process. In its raw state, the hydrogen contains impurities such as tar, preventing its use in fuel cells, for example. A final step cleans up the hydrogen and the finished product is 99.999% pure.
HUI is planning a flagship plant at Konin in Poland and approval by the authorities to start work is expected by the end of this year. HUI production units will be capable of producing 2.7 tonnes of pure, road-fuel-quality hydrogen from 40 tonnes of plastic waste. Only 1.5 hectares are needed for a plant and the company says its units can easily be bolted on to existing waste disposal plants.
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