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liquid ring compressor in pulping papermaking process

The application of liquid ring compressor in pulping and papermaking process, the purpose of pulping process is to transport qualified pulp for paper machine to ensure smooth production. In the process of pulp and papermaking technology, vacuum dewatering method can be applied to dewatering process, and vacuum pumping of liquid ring compressor is a common method of paper dewatering.


In the process of pulping and papermaking, vacuum dewatering is used in many processes.


1. Brown Pulp Washing Machine


A vacuum can be created inside the drum of the gasket, which allows the material to adhere to the drum surface and allows the black liquor to be washed out of the material while the drum is operating in the slurry.


2. Sediment filter


Sediment filters in pulp and paper mills are horizontal drum filters, in which vacuum conditions can be generated inside the drum to collect particles from green liquor.


3. Vacuum dehydrator


Vacuum dehydrator can be used for dehydration of raw materials in the preparation stage. It is a horizontal drum filter, which can realize the proportion dehydration of pulp and increase the concentration of raw materials.


4. Headbox Compressor or Vacuum Pump


Headbox compressors or vacuum pumps are used in slurry tanks. Through a series of valves, pressure or vacuum can be added to the raw material tank of headbox to control the material discharge rate.


5. Suction tank


The suction box is used in the forming part of paper and can be dehydrated directly from the pulp. Rotary vane vacuum pump is used to produce vacuum condition in suction tank vacuum box.


6. Rollers


The bed roller is an important dewatering part in the paper forming stage, and has a rotating porous shell which can have one or two vacuum areas.


7. Vacuum Compression


The vacuum press mechanically extracts moisture from paper. Paper machines usually have one or three pressing areas, and when paper is conveyed and padded, moisture is squeezed into the blanket.


8. Blowout preventer


The windproof box is fixed before the paper is transferred and can be used to create a vacuum in the upper part of the press section. Vacuum pump is widely used in papermaking industry. Rotary vane vacuum pump has good performance in this industry.


Generally speaking, the standard pumping capacity of paper production line is certain, but in order to reduce energy consumption and save production costs, the choice of vacuum pump is particularly important. Therefore, the choice of liquid ring compressor is important for the producers who use pulp and paper technology.


There are three indexes to judge whether the type selection of liquid ring compressor in a pulp and paper vacuum system is reasonable: the pumping capacity, the working point shaft power and the matching power of the motor. When selecting the type, on the premise that the pumping power meets the technological requirements of the production line, the working point shaft power of the vacuum pump should be reduced as much as possible, because the smaller the shaft power consumed by the vacuum pump, the lower the cost of pulping and papermaking. The matching power of motor is smaller, the total installed capacity is smaller, and the cost of electrical configuration can also be reduced.

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