The CLC rig is a Double Loop Circulating Fluidized Bed reactor system used for research on chemical looping combustion. The design values are 150 kW gaseous fuels input and reactor temperature of 1000°C. The rig consists of an Air Reactor(AR) and a Fuel Reactor(FR), interconnected by divided loop-seals and a bottom lifter. The reactor design is flexible as the reactors can be run individually because of the divided loop seals,and the fuel reactor can both be run as a CFB and as a bubbling bed because of the possibilities of using the bottom lifter.
The reactors are 6 m tall with internal diameters 230 mm and 154 mm for AR and FR, respectively. The reactor system is equipped with exhaust gas coolers as well as cooling panels within the air reactor. The coolers can be cooled with pressurized air or steam. The main operational characteristics of the rig can be listed as follows:
To monitor, control and analyse the process, the rig is equipped with:
The control system is based on a National Instruments compact RIO controller. It is programmed using LabVIEW which enables us to execute quick changes in the control system software. It communicates with a Windows based system over network using an ethernet connection. This also enables other clients (i.e laptops, smart phones) to access the data acquired by the system. The control system currently counts 136 input channels and output channels, analogue and digital.
The CLC Rig is a rather large test facility for CLC with nominal fuel input of 150 kW and reactors height of 6 meters. Both the fuel reactor and the air reactor are based on circulating fluidized bed (CFB) technology and the fuel reactor diameter is smaller than the air reactor because of the smaller gas flow. This is very much in line with design considerations for a commercial unit as pointed out in Lyngfelt and Leckner (2015). Since the fuel reactor also can be run in bubbling bed mode with particle circulation through the lifter, the system possess large flexibility in operation. Per today the rig is operated on gaseous fuels and a rebuild and adaption to solid fuels and biomass is now taking place.
The SINTEF ER CLC Rig offers assessment of fuel conversion, oxygen carrier's attrition and other important characteristics of the CLC process through exhaust gas emission measurements and particle sampling during operation. Oxygen carrier particle samples can be analysed mechanically and chemically by another department at the campus. They can also contribute with some preparation of the oxygen carrier particles, especially on particle size classification.