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Advanced biofuels can be produced extremely efficiently, industrial demonstration confirms

A chance to switch to renewable sources for heating, electricity and fuel, while also providing new opportunities for several industries to produce large numbers of renewable products. This is the verdict of researchers from Chalmers University of Technology, Sweden, who now, after ten years of energy research into gasification of biomass, see an array of new technological achievements.

The combustion boiler at Chalmers Power Central was converted to a gasifier in 2007. Since then, more than 200 man-years of research have been devoted to gasification technology (photo courtesy Chalmers).

The potential is huge! Using only the already existing Swedish energy plants, we could produce renewable fuels equivalent to 10 percent of the world’s aviation fuel, if such a conversion were fully implemented, said Henrik Thunman, Professor of Energy Technology at Chalmers.

How to implement a switch from fossil fuels to renewables is a tricky issue for many industries. For heavy industries, such as oil refineries, or the pulp and paper industry, it is especially urgent to start moving, because investment cycles are so long. At the same time, it is important to get the investment right as any advanced replacement or retro builds of boilers or facilities entails major financial costs.

Thanks to long-term strategic efforts, researchers at Chalmers University of Technology in Gothenburg, Sweden have now paved the way for radical changes, which could be applied to new installations, as well as be implemented at thousands of existing plants around the globe.

Biomass gasification with existing boilers

The solution presented involves widespread gasification of biomass. This technology itself is not new. Roughly explained, what is happening is that at high temperatures, biomass is converted into a product gas (syngas). This gas can then be refined into end-products which are currently manufactured from oil and fossil gas. The Chalmers researchers have shown that one possible end-product is biomethane that can replace fossil gas in existing gas networks.

Previously, the development of gasification technology has been hampered by major problems with tar being released from the biomass, which interferes with the process in several ways. Now, the researchers from Chalmers’ division of Energy Technology have shown that they can improve the quality of the product gas through chemical processes, and the tar can also be managed in completely new ways.

This, in combination with a parallel development of heat-exchange materials, provides completely new possibilities for converting existing district heating boilers to biomass gasifiers.

What makes this technology so attractive to several industries is that it will be possible to modify existing boilers, which can then supplement heat and power production with the production of fossil-free fuels and chemicals, said Martin Seemann, Associate Professor in Energy Technology at Chalmers.

Professor Henrik Thuman presenting some of the findings at the European Biogas Association (EBA) 2018 annual conference.

The plants which could be converted to gasification are power and district heating plants, paper and pulp mills, sawmills, oil refineries and petrochemical plants.

We rebuilt our own research boiler in this way in 2007, and now we have more than 200 man-years of research to back us up. Combined with industrial-scale lessons learned at the GoBiGas (Gothenburg Biomass Gasification) demonstration project, launched in 2014, it is now possible for us to say that the technology is ready for the world, said Professor Henrik Thunman.

The Swedish Energy Agency has funded energy research and infrastructure at Chalmers for many years. How much of this technological potential can be realised depends on the economic conditions of the coming years, and how that will affect the willingness of the industrial and energy sectors to convert.

The technical solutions developed by the Chalmers researchers are therefore relevant across several industrial fields. Chalmers´competence and research infrastructure have played and crucial role for the demonstration of advanced biofuels within the GoBiGas-project, said Klara Helstad, Head of the Sustainable Industry Unit at the Swedish Energy Agency.

The availability of biomass is also a crucial factor. Biomass is a renewable resource as long as the conditions for its biological production are not compromised. There is, therefore, a limit for total biomass output.

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