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Pulp digester, also called digester, is a huge container for chemical pulping and
dissolved fiber steam sections. It is used to cook raw materials of paper pulp,
such as grass, wood, boom and so on. Pulp digester is not only apply for kraft
process but also sulfite process. The raw materials of digester have carbon steel
structure, composite steel structure, dual phase stainless steel due to the
difference of alkaline pulping and acid pulping process.
As our main product, we can produce various specifications including 50m³、75m³、
110m³、135m³、175m³、225 , m³、250m³、400m³. Among them the maximum diameter is 5.8
meters and the maximum volume is 400 cubic meters. Customers can choose the most
suitable pulp digester according to the real requirements.
making pulp digester
WORKING PRINCIPLE OF PULP DIGESTER
Before cooking, all raw materials must keep moisture content below 15 percent,
silicon less than 3 percent, ash about 2-3 percent and cellulose about 50-55
First, cut the raw material into about 25 by 30mm slices and feed them into the
cooker through the conveyor belt.
The requirements of pulping process usually determine the length of cooking
process, in particular, the length of cooking process depends on the yield and
hardness of pulp. Cooking usually lasts 5-6 hours, during which cooking
temperature should be kept at 160-175 ℃.
The heating process mainly refers to the indirect heating area of the tube heater.
The liquid from the center flows through the tube and heats up and moves from the
top to the bottom. Next, reheat the liquid about 8-12 times an hour. At the same
time, the steam enters the auxiliary heating through the vent at the bottom.
In the course of cooking, gas is released through the upper vent to reduce the
false pressure caused by the air inside the cooker, to ensure the pulp cooking
uniformity and to improve the pulp quality.
After cooking, under pressure, remove the pulp from the cooker and enter the
discharge tank for temporary storage.
working principle of digester
Generally, according to the different pulping process, there are vertical digester
and horizontal digester in the chemical pulping productions.
In general, vertical digesters are used for super-batch cooking. We use the most
advanced batch cooking process-displacement cooking process, efficient and low-
cost and high-quality pulp. So here vertical digester can be called displacement
Continuous cooking is a widely used pulping process at present, which has many
advantages over traditional pulping technology. Please refer to pulp cooking
process for details. Horizontal digester is an important part of continuous
cooking process. The digester is mainly used in pulping of various raw materials,
including wood chips and loose and permeable materials such as bagasse, wheat
grass, reed and straw etc.
If you're interested in our paper pulp digester or have any questions about
digester for paper pulp process, please don't hesitate to contact us! We are
always at your service!
Minimum Order: 1 sets
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SOURCE: Import-Export Bulletin Board (http://www.imexbb.com/)
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