New facilities and information relating to prevention of air pollution by kraft pulp mills (Afrikaans)
This article discusses the new safety antipollution checkups being applied to pulp mills. The origin of malodors in Kraft pulp mills must be sought primarily in the use of direct contact evaporators, and not at the recovery site. A modern Kraft recovery system can regulate flue gas incineration to the extent that undesirable gases are completely incinerated. Using heavy wood lye oxidation before the lye comes into contact with the combustion gases in the direct contact evaporator, the amount of malodorous substances can be restricted. Alternative methods for odor control in the pulp mill are discussed, including the Ljungstrom type laminar air heater, multipole effect evaporation to a high concentration, bypassing the direct contact evaporator and the Copeland system.