Abstract
In order to obtain the profit by means of improving the cooking efficiency and saving the energy consumption without increasing the production rate, No. 2 continuous digester has been modified from MCC cooking to COMPACT COOKING™ G1in Moorim Group Donghae Pulp Co. Ltd. With this modification it was showed that increased the cooking yield about 1%, improved the viscosity of the blow pulp, and saved a certain amount of the steam consumption. In the study of No. 2 digester further modified to COMPACT COOKING™ G 2 in which No. 1 batch digesters are stopped and No. 2 digester is increased its production rate to 1400 ADt⁄day to keep total production rate same as before. It is showed that saving a huge amount of steam, increasing cooking yield, viscosity, brightness, and reducing reject content in the blow pulp. On the other hand, with DiConn system it is possible to run with higher blow temperature than 100°C, it results in a higher wash efficiency both in Hi-heat zone of a digester and in a PDW, produce more flash steam in the cyclone, and increase the dry solids content in black liquor to the recovery boiler. In order to optimize the energy consumption in a fiber line, it is important to confirm the heat balance from a cooking plant to a bleaching plant for using warm⁄hot water effectively, especially for the digester in which the flash steam don’t send to the steaming vessel.
