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Chalmers 10kW unit
Chalmers 10kW unit

Chalmers 10kW

Chalmers' 10 kW unit showed the first successful operation of the CLC process in 2003, and has been used for >1400 h in operation with natural gas. The unit is particularly well suited for longer operation as it has a surveillance system making it possible to operate un‐manned during night‐time, thus making it possible to operate Monday‐Thursday. The unit collects fines leaving thesystem, and it is possible to determine the formation of fines by sieving the outgoing material even if it is very small, e.g. 0.002 %/h. The unit is also highly relevant for evaluating the attrition of a fullscale unit as it is designed with high velocities of the riser, cyclone inlet and gas distributor nozzles – the three main sources for attrition. It should be said that the combustion air enters via nozzles at high velocity, 100 m/s, which is much higher than in an full‐scale unit, thus the conditions of the 10 kW unit is expected to be more severe than in full‐scale. The reactor system involves an air reactor with high velocity riser leading to a cyclone, where solids are led via a loop seal down into the fuel reactor. The fuel reactor has an overflow exit leading the solids via a second loop seal back into the air reactor. Circulation is controlled by air flow, air reactor temperature by a cooling jacket, and fuel reactor temperature by external heaters. The system is fully equipped with a number of measurement points for pressure and heat as well as on‐line gas analysers for the outcoming gases, including a GC for more specific measurements. Loop seals can be fluidized by N2 and steam. The latter allowing for reaching CO2 concentrations close to 100%.