Digester

Digester is mainly used for cooking and pulpingwith wood, bamboo and the like as raw materials.The water content of the material is less than 15%, the ash content is 2%-3%, the cellulose content is 50-55%，the lignin content is 22%-25%,and the content of silicon is less than 3%. First, the material is cut into thin chip(25mmx30mm),and then it enters the digester filled with coolant and steam through the conveyor belt. The cooking time is determined by the pulping process requirements (Yield and hardness of pulp). and it will last for 5.5h-6h. The cooking temperature is 160°C-175°C.The heating process mainly involves the effective indirect heating zone of the tube heater. The liquor flowing out from the center goes through the tube to be heated and transported from top to bottom, and then it will be heated circularly for8-12 times per hour. At the same time, the steam enters through the vents at the bottom for auxiliary heating. During the cooking process, the gas is exhausted through the upper vents to reduce the false pressure caused by the air inside the main body of the digester to ensure the uniformity of the cooking pulp and improve the quality of the pulp. After the cooking is completed, the pulp is separated.