AER-GAS IIProject reference: 518309
Funded under: FP6-SUSTDEV
Biomass fluidised bed gasification with in situ hot gas cleaning
Total cost:EUR 2 652 614
EU contribution:EUR 1 800 000
Call for proposal:FP6-2004-ENERGY-3
Funding scheme:STREP - Specific Targeted Research Project
The project aim is a low-cost gasification process with integrated in-situ gas cleaning for the conversion of biomass into a product gas with high hydrogen concentration, high heating value and low tar/alkali/sulphur concentration in one process step for s ubsequent power production. The proposed process uses in-situ CO2 capture (AER, Absorption Enhanced Reforming). It is more efficient than conventional gasification due to (i) the in-situ integration of the reaction heat of CO2 absorption and water-gas shif t reaction heat (both exothermic) into the gasification and (ii) the internal reforming of primary and secondary tars, which cuts off the formation of higher tars. Thus, the chemical energy of tars remains in the product gas. The product gas after dust rem oval can directly be used in a gas engine for electricity generation. Due to the low operation temperature (up to 700°C) and due to CaO-containing bed materials, the proposed process allows the use of problematic feedstocks such as biomass with high minera l and high moisture content, e.g. straw, sewage sludge, etc., leading to an increased market potential for biomass gasification processes. Screening/development of absorbent materials with high attrition stability and tar cracking properties will be carrie d out. Analysis of tar formation/decomposition process will be studied in a lab-scale fixed bed reactor and a 100 kWth circulating fluidised bed reactor (continuous mode). With the acquired data, the 8 MWth biomass plant at Guessing, Austria, will be opera ted with absorbent bed material in order to prove the feasibility of a scale-up and to assess the economical aspects of the process. In order to point out the market potential, the cost reduction of the AER technology will be quantified in comparison with the conventional gasification power plant. Expected results will be: (i) a broad knowledge of the proposed process and (ii) a low-cost technology for biomass gasification with subsequent power production.