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Abstract
The insect population in grain stores can be kept under control by maintaining a high concentration of CO2 gasthroughout the grain bed. A method of calculating the distribution of the fumigant gas is useful for the design and managementof grain storage systems. The equations that can be used to calculate this distribution are given, and they describe how theCO2 gas moves through a grain bin as a result of diffusion, gravity, and sorption. The equations are solved numerically, andthe results are compared with experimental values. An analytic solution is given of a simplified version of the equations, andthis is used to describe how the gas moves through the grain bed. It is shown that diffusion is the main process for most ofthe time that the gas is in the bin, and this can be used to estimate how the CO2 concentration changes with time.
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