Abstract
A thermal conductivity detector (TCD) has been implemented to minimize errors in measurement of helium concentrations in a gas stream sampled from a gas-solids fluidized bed. TCDs are commonly used assuming a constant sample flow rate. However, the flow rate of a sample taken from a fluidized bed fluctuates. This can lead to errors of up to 30% in measured helium concentration. Sample flow rate may also vary from one sampling position to another in the bed. Adjusting a sample flow to the fixed rate for which the TCD was calibrated is time-consuming and consequently increases the consumption of expensive helium. The present improved TCD technique allows variations in sample flow during measurements. The flow through the TCD sample line is measured by a pressure transducer. Helium concentration is then determined from a sample flow-corrected calibration equation.
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