uids to be collected, they must pass through thick layers of pyrolysis char, and numerous secondary reactions result. For these reasons, the pyrolysis products of wood from a large retort can contain more than 120 products.

The same conditions are true for individual particles. For a material having the thermal properties of wood, the time required for the center temperature of a sphere to reach the surface temperature can be given by the following equation:

where r is the radius in inches and t is in hours. This equation indicates that about one hour is needed for the center of a 3-in particle to approach the surface temperature.

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