Chemical Looping Combustion (CLC) is conventionally carried out in circulating fluidized bed systems involving various kinds of fluidized beds and solid handling devices. Scale-up of these systems is a research and development challenge associated with various risks and uncertainties. Gas bypassing, poor gas–solid contact and poor performance of solid circulation control devices are among the major considerations in this regard.This paper presents impacts of temperature on the fluidization properties in CLC application. Impacts of temperature on the minimum fluidization velocity and the onset of turbulent regime are studied in various temperatures up to 900°C. Increase of temperature decreases the minimum fluidization velocity and increases the onset of transition to turbulent regime.Impact of size and temperature on the performance of pneumatic valves (L-valve and loop-seal) are investigated using valves in a range of 2–24cm in a temperature range of 25–750°C. Geldart group B particles of 100–300μm and density of 2600–4750kg/m3 are used in these experimental tests.