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MOTAT steam tram powered by trees

10 August 2023
It’s out with the coal and in with the biofuel for steam tram no. 100, which will operate on a renewable energy source made from trees at MOTAT Live Day on August 20. Developed by Crown Research Institute, Scion, the biofuel will undergo its largest trial to date, which will see 250 kilograms of briquettes supplied to MOTAT to keep the little tram that could, running all day.

Scion is on a mission to unlock the potential of this ‘waste’, seeing massive opportunities in the estimated four million tonnes of harvest and thinning residues that currently remain in production forests. Scion Integrated Bioenergy portfolio lead Paul Bennett says a biofuel future is essential for New Zealand to meet its global climate change commitments. “Energy use contributes to around 90 per cent of New Zealand’s carbon dioxide emissions. If Aotearoa is going to achieve its net zero target, it needs to address emissions from energy use.

“This is currently the most achievable target for New Zealand to reduce carbon emissions. “To bring biofuel to the market and successfully replace coal, the technology needs to be tested at a range of scales. This partnership with MOTAT is the ideal first step to demonstrate the effectiveness of biomass briquettes at a larger scale, with a like-minded company that wants to reduce its environmental impact,” Bennett says.

MOTAT Collection Workshops Manager Graham Anderson says the museum is committed to reducing its carbon footprint and the trial is another step in the journey toward becoming carbon neutral. “Steam tram no. 100 has a fascinating history,” says Anderson.

Built in the United States in 1891, it was shipped to Sydney where it operated on the New South Wales Government Tramway system until 1905 when electric trams replaced steam services. It was briefly used by the private Saywells Tramway at Rockdale and then brought to Whanganui, New Zealand in 1910 for construction of the Gonville and Castlecliff Tramway Board’s electric tramway extensions to the Wanganui system.

This work was completed in 1912 and the tram was then placed in storage. It was briefly pressed into service hauling passengers between July and October 1920 when the electric tramway power supply failed. It was restored to operational condition by MOTAT in 1971, and today runs on MOTAT’s tramway from Great North Road to Motions Road.

Although MOTAT has a licence to burn coal and complies with all legislation, it is investigating options for more sustainable, clean, or cleaner, fuel alternatives. The collaboration with Scion is an opportunity to further this research. Scion scientists have been developing the biofuel since the early 2000s, but recently accelerated their pace of progress with significant breakthroughs in the past 12 months. Scion scientist Dr Bing Song says the success to date is a culmination of more than 20 years’ work.

“The project team are experts in this field. While the machinery is not new and the concept of continuous briquetting has been around for decades, the magic is really in the method. Our deep knowledge and understanding allow us to see results not yet recorded in scientific journals.

“We have been excited to be seeing positive developments of the biofuel in the past 12 months. And with further engineering innovations in the pipeline, we’re feeling confident about the future of this project.” Thermal coal’s average bulk density is approximately 700 to 800 kilograms per cubic meter. To date, Scion has achieved a density of around 550 kilograms per cubic meter with a durability greater than 91 per cent, qualifying the briquettes as a coal replacement for medium/low process heat supply.

“While there are biofuel pellets on the market internationally, the geometry of these mean they sometimes cannot meet the requirements of all existing coal users/boilers. They are typically too small and will fall straight through the ash grate at the bottom of the boiler. Scion’s briquettes overcome this limitation and we will continue to experiment to determine the best shape,” Dr Song says. He adds that his door is open for individuals and organisations interested in bringing the solid biofuel to market.

Source: Scion

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