Traditional cooking workshop and corollary equipments: (Bleaching system, chemical liquor storage system)
Replacement cooking process is the most advanced batch cooking process in the world currently, and has the following advantages compared with traditional cooking process: The steam consumption is decreased down to 0.6T-0.8T per ton of pulp (Traditional digester consumption is 2.0T-2.5T per ton of pulp)Low kappa, high strength and high yield of pulp can be obtained through deep delignification.
The pulp obtained better bleaching properties. Due to low kappa value and high strength, it is convenient for oxygen delignification, which reduces the consumption of bleaching chemicals and lowers the pollution.
The production process is controlled by computer and human intervention is eliminated to the greatest extent, which ensures the stability and reliability of the system.
Replacement cooking process adopts the principles of the replacement cycle of black liquor in the batch digester and the diffusion cleaning. The consumed cooking liquor and heat are replaced,and completed by cold blowing. The process can utilize black liquor repeatedly, and the lignin, as well as dissolved hemi-cellulose, can be extracted from the cooking system completely during the delignification stage. In the supplementary delignification stage, the cooking liquor can be re-added. By this way, heat and chemicals can be recycled, and the cooking state is balanced continuously throughout the cooking process, which improves pulp quality and production efficiency.
