In terms of various stages of pulp and paper production, the vacuum system used in the net and press sections of paper machines is a highly energy consuming process and has become a key focus of energy-saving technological upgrades for various paper companies.
1.Vacuum system assists in drainage
When the paper moves from the wet side to the dry side, a vacuum system is needed to assist in draining the water. Specifically, the vacuum system creates an airflow by attracting air, which forms an air film at the pulp washing box, water tank, and mesh outlet of the paper machine, creating an upward suction force to remove excess moisture. This can improve paper quality and increase production efficiency.
2. Ensure the dryness of the paper
Drying paper is an essential step in the production of paper. The function of the vacuum system in the drying process is to attract air, promote the drying of paper, prevent moisture residue on paper, and prevent mold growth. In the drying section of the paper machine, the vacuum system performs air convection in the drying cylinder to quickly dry wet paper and improve production efficiency.
3.Wastewater treatment
In the process of producing paper, a large amount of wastewater is generated due to the involvement of a large amount of moisture. The vacuum system plays an important role in this regard, as wastewater can be discharged through vacuum suction. Wastewater treatment is also a part of the proper use of vacuum systems. By using separation equipment and evaporators, pollutants and impurities in pulp are separated, and then the water is evaporated to meet the standards before discharge, thereby achieving environmental protection and energy conservation.
Overall, the vacuum system plays a very important role in paper machines, promoting the improvement of paper quality and enhancing production efficiency. But at the same time, this also requires the safe use of equipment, prevention of malfunctions, and proper prevention and protection measures.
Extended reading:
Modern paper machines use vacuum assisted paper dewatering, so the vacuum system is an important component of paper machines.
The scaling of papermaking liquid ring vacuum pumps has become a common problem encountered by every papermaking enterprise. Whether formed in the south or north, it is not immediately generated, but rather a process of formation. The production of oxide scale is gradually showing its impact on paper machines. Therefore, we cannot take it lightly from the beginning and must consistently prevent the control of oxide scale, which will have long-term benefits.
(1) Liquid Ring Vacuum Pump Of Scaling For Reasons
1. Water quality impact: high pH value and high hardness.
2. The whitening degree of papermaking water increases, the insoluble content is high, and scale ions accumulate.
3. A large amount of filling material.
4. Temperature: The water temperature rises and the cooling system is not fully utilized.
The lack of regular cleaning and maintenance of the water circulation system will increase the possibility of scaling in the papermaking liquid ring vacuum pump.
(2)Liquid Ring Vacuum Pump On Papermaking Of Adverse Effects
1. Seriously reduce the vacuum degree and pumping volume.
2. The increase in motor current leads to an increase in power consumption.
3. Often causes the vacuum pump to get stuck, making it difficult to start, the paper machine to stop, and the vacuum pump to not stop.
Frequent acid washing or manual disassembly not only damages the equipment, but also destroys its accuracy, leading to the formation of vacuum or a decrease in vacuum degree.
(3)Liquid Ring Vacuum Pump for Solution
For a long time, traditional cleaning methods such as mechanical methods (scraping, brushing teeth), high-pressure water, chemical cleaning (acid washing), etc. have encountered many problems when cleaning equipment: they cannot completely remove scale, such as limescale, and acid corrosion can cause equipment corrosion. Residual acid may cause secondary corrosion or scale corrosion of materials, which may lead to equipment replacement. In addition, cleaning waste liquid is toxic and requires a large amount of money for wastewater treatment.
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