Improved Understanding of Chip Steaming and Impregnation, 2004 Engineering, Pulping, and PCE&I Conference

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Efficient removal of air from wood chips prior to impregnation with cooking liquor is essential for achieving pulping uniformity and improving overall digester performance. Due to its effectiveness and relative simplicity, presteaming of wood chips with flash and/or fresh steam became a primary process in pulp industry to fulfil this task. Steaming of wood chips enables effective removal of air from the chips only if the retention time at steaming temperature is sufficient. This paper deals with fundamentals of air removal during presteaming. A process mechanism is proposed and verified based on model simulations and experimental data. Effects of various factors, including wood species and chip dimensions are discussed. The paper also compares existing chip steaming systems from the standpoint of air removal efficiency.

Author: Malkov, S., Leavitt, A., Stromberg, B.
Improved Understanding of Chip Steaming and Impregnation, 20
Improved Understanding of Chip Steaming and Impregnation, 2004 Engineering, Pulping, and PCE&I Conference
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