The overall objective of Residue2Heat is to enable the utilization of sustainable, ash rich biomass and residues in residential heating applications (20-200 kWth) to provide sustainable heat at a competitive price. In this concept, various 2nd generation agricultural, and forestry residue streams are converted into a liquid energy carrier near the biomass origin at an economic viable scale of 15-30 MWth using the fast pyrolysis process. Subsequently, the fast pyrolysis bio-oil (FPBO) is distributed to a large number of residential end-users. The FPBO should fulfill at least the draft CEN-specification for replacement of domestic heating oil and comply with REACH regulation. Additional quality control aspects for this application include the removal of extractives and solids from the FPBO. Ash is recovered from the fast pyrolysis process as a separate stream, and recycling and/or re-use will be evaluated in detail. Existing high efficient, condensing boilers are used as starting point in the project, as well as a proven, low emission blue-flame type burner. Within Residue2Heat technical development work is performed on the modification of such systems to enable FPBO as fuel. The emission control and energy efficiency of the heating systems are optimized by dedicated modeling of FPBO atomization and combustion kinetics, supported by single droplet combustion tests and spray characterization. This route benefits from the flexible nature of the fast pyrolysis process, allowing the use of various lignocellulosic biomass streams, but also by using modified residential heating systems for which manufacturing capabilities, market development and product distribution are already in place. Dedicated tasks are included to assess the environmental and social impacts, risks analysis and public acceptance. Additionally, business and market assessment activities are performed including specific issues on health and safety relevant to FPBO-fuelled residential boilers.

Wind and sun will be central energy sources of a climate neutral Europe 2050, bringing with them the need to balance weather dependent differences between supply and load. Conventional gas turbines can fulfill this task also for longer periods even well as they can stabilize the grid with their capability of quick start/stop. However, their efficiency is limited and even if burning climate neutral hydrocarbons they still produce local emissions. HERMES overcomes these limitations and advances gas turbine technology to the future-proof level by creating a reliable, flexible, zero-emission solution for energy supply with long term impact at EU level. HERMES develops and assesses the first highly efficient closed-loop supercritical zero emission energy system. It is based on directly fired supercritical gas turbine engine operating on locally synthesized renewable liquid and gaseous fuels (e.g. methanol or hydrogen) coupled with decentralized carbon capture utilization and storage (CCUS). The carrier medium is highly dense supercritical carbon dioxide or xenon demanding less compression power. Therefore, and because of operating at high pressure conditions (above 150 bar), the system achieves significantly higher efficiency (above 65%) than todays gas turbines. By utilizing pure oxygen for fuel oxidation, and by capturing bulky flow of exhaust products (H2O and/or CO2) and reusing them for fuel synthesis, the system produces virtually no pollutants. A detailed assessment of the HERMES approach will be done using experimental and computational approaches and dynamic simulation tools including digital twins and machine learning. The 36-month project will be realized by an 11-partner consortium including 3 SMEs with expertise in renewable energy, combustion, techno-economics and socio-political science. Hermes will pave the way to a major breakthrough in the understanding of fundamentals of combustion in supercritical fluids with zero emission of any pollutants.

Fit4Micro aims to develop a hybrid microCHP unit running on sustainable liquid biofuels. Application is foreseen at multi-family houses, and more specifically at remote and/or off-grid locations. The innovative system is based on a double shaft micro gas turbine (mGT) combined with a novel humidification unit. This unique combination leads to very high electrical efficiencies (>40%) as well as a very flexible heat:power ratio. Low emissions are achieved by the application of flameless combustion, and a high GHG emission reduction is obtained by using truly advanced, RED2 compliant biofuel. Use of a mGT as core-unit in Fit4Micro is ideal for domestic usage, as the system has very low noise output and is vibration free. Furthermore, rapid response times and fuel-flexible operation make this the ideal base for a highly efficient hybrid CHP system, resilient to changes in (local) fuel and power markets, empowering the consumers through digital solutions. Furthermore, the Fit4Micro unit will be integrated with a compression heat pump, an innovative adsorption and a solar PV system through the DC power system avoiding transmission losses. A smart control system will be developed to enable optimal performance at all times. Efficient fuel distribution and off-grid operation of Fit4Micro is enabled by using sustainable liquid biofuels. These fuels will be produced from biomass residues and organic waste streams, through fast pyrolysis followed by mild hydro-processing yielding a hydrotreated pyrolysis oil (HPO). In Fit4Micro the objective is to widen the feedstock basis and lower the fuel costs by i) using residues as the primary feedstock, and ii) by limiting hydrogen consumption by application of mild processing conditions. Besides technological development work, the Fit4Micro project includes specific activities on socio-economic and environmental sustainability, public perception, gender dimensions, market aspects, the regulatory framework & policies.

Carbon neutral, high-energy density e-fuels are crucial to de-fossilize long-haul transport. Mildly oxygenated compounds such as C5+ (higher) alcohols and their ether derivatives hold the promise to overcome limitations of known e-fuels, such as non-oxygenated Fischer-Tropsch hydrocarbons or heavily oxygenated methanol and DME, but no process exists for their effective production. The project aims to develop a disruptive route wherein CO2, water and renewable power are converted to higher oxygenate e-fuels in a once-through hybrid process integrating three major catalysis branches: “electrocatalysis” is applied in a robust high-pressure CO2/H2O co-electrolysis step to produce e-syngas (H2/CO), which is converted in a single-reactor, slurry-phase process combining “solid thermocatalysis” for linear hydrocarbon synthesis and “molecular chemocatalysis” for in situ oxo-functionalization via reductive hydroformylation. In this process, integration of catalytic functionalities in tandem, alongside an engineered interfacing of high- and low-temperature conversion steps and energy unintensive membrane separation technologies, offer a blueprint for superior atom and energy efficiencies. The project will demonstrate the new e-fuel production process at bench-scale, and assess its capacity to cope with fluctuating energy inputs. Moreover, e-fuel formulation and life-cycle aspects are covered to fully realize the potential of the higher oxygenate e-fuel to distinctively unite excellent combustion properties (high cetane), exceptional reduction of tailpipe soot emissions, advantageous logistics as liquid at ambient conditions and compatibility with current-fleet fuel infrastructure and engine technologies, with emphasis on applications as diesel replacement in heavy-duty marine transport. An exploitation plan will be created together with international stakeholders, to consolidate EU’s capacity to export advanced e-fuel technologies to areas with vast green energy potential.