Small-Scale Demonstration Proof of Principle

The bed was cooled with a N2 gas flow, which was refrigerated in a coil positioned in a liquid nitrogen bath. After cooling, the feed was switched to a N2/CO2 mixture with or without the addition of H2O. 

These mixtures were prepared by controlling the gas flow rates of N2 and CO2 with mass flow controllers (Bronkhorst El-flow). This mixture could then be fed to a saturator filled with demineralized water. The water content of the feed flow could be varied by changing the temperature in the saturator. The flow from the saturator could be further overheated by using an electrically traced line. The temperatures in the bed were measured along the bed length in the radial centre with 11 thermocouples (Thermo-Electric K-type) at every 3 cm in axial direction. The pressure at the inlet of the bed was monitored by using an analogue pressure indicator. 

The CO2 content in the outlet stream was analyzed with an IR-analyzer (Sick-Maihak, s610,0-3 vol%). The front of sublimated CO2 was visually inspected with a camera. Axial temperature profiles have been measured for different initial bed temperatures and inlet mole CO2 and H2O fractions (see Table 2.7). 

---