We have summarized the work of the last ten years at Chalmers Power Central and GoBiGas in the report: "GoBiGas demonstration – a vital step for a large-scale transition from fossil fuels to advanced biofuels and electrofuels". Researchers at the division of Energy Technology at the Department of Space, Earth and Environment at Chalmers have worked together with colleagues at the departments of Chemistry and Chemical Engineering, Microtechnology and Nanoscience, Technology Management and Economics, Biology and Biological Engineering, Mechanics and Maritime Sciences as well as a wide range of Swedish and international collaborative partners in industry and academia.
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 paper and pulp 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 because you may be forced to replace boilers or facilities in advance, which means major financial costs. Thanks to long-term strategic efforts, researchers at Sweden´s Chalmers University of Technology 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.
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 gas. This gas can then be refined into end-products which are currently manufactured from oil and natural gas. The Chalmers researchers have shown that one possible end-product is biogas that can replace natural gas in existing gas networks.
The problems with tar are solved
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 biogas through chemical processes, and the tar can also be managed in completely new ways, see images to the right. This, in combination with a parallel development of heat-exchange materials, provides completely new possibilities for converting district heating boilers to biomass gasifiers.
Watch an animation with more details about how the problems with tar has been solved.
"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.", says Martin Seemann, Associate Professor in Energy Technology at Chalmers.
“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,” says Professor Henrik Thunman. “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.”
Many applications
The plants which could be converted to gasification are power and district heating plants, paper and pulp mills, sawmills, oil refineries and petrochemical plants.
“The technical solutions developed by the Chalmers researchers are therefore relevant across several industrial fields”, says Klara Helstad, Head of the Sustainable Industry Unit at the Swedish Energy Agency. “Chalmers´ competence and research infrastructure have played and crucial role for the demonstration of advanced biofuels within the GoBiGas-project.”
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 availability of biomass is also a crucial factor. Biomass is a renewable resource, but only provided we do not deplete the conditions for its biological production. There is therefore a limit for total biomass output.
Translation: Joshua Worth.