METHOD AND APPARATUS FOR REGULATING A PEROXIDE BLEACHING PROCESS

摘要

Bleaching device for pulp includes a container (T) to which a supply of pulp (M) and bleaching chemicals (C) containing peroxide as well as discharge of bleached pulp (B) are connected. The device comprises an oxygen measuring device (A, X), a temperature measuring device (S) and/or a carbon monoxide measuring device (A, V), which are arranged to measure oxygen concentration, temperature and/or carbon monoxide concentration, respectively, from the contents of the container (T) such as from the gas volume of the same, or from a substance flow coming from the container, such as gas flow. The measuring device is connected to a data processing unit (U) which is coupled to a controller for automatic control of the process. The process is especially a high consistency pulp bleaching of mechanical pulp, in which the consistency of pulp in the reaction area is at least 25 %, advantageously at least 30 %.