Medium-consistency Pressure Screen

 

The medium-consistency pressure screen is mainly used to handle pulp at a medium consistency, typically ranging between 8% and 15%. Compared to low-consistency pressure screens, it can perform effective screening and separation operations at a higher pulp consistency.

Its working principle is to utilize the pressure difference to make the pulp pass through the screen holes on the screen plate, separating impurities, coarse fibers, and non-compliant fibers, thereby obtaining pulp of higher quality and purity.

 

The medium-consistency pressure screen has several significant characteristics and advantages:

Firstly, it can enhance production efficiency. As it can handle medium-consistency pulp, the steps of dilution and concentration are reduced, thereby saving energy and time.

 

Secondly, the screening effect is excellent. It can more precisely separate impurities and non-compliant fibers, improving the quality and uniformity of the pulp, and subsequently enhancing the quality of the final paper product.

 

Furthermore, the structure and design of the medium-consistency pressure screen give it good stability and reliability. It can operate stably for a long time under more complex working conditions, reducing equipment failures and downtime.

 

In addition, it also has a certain energy-saving effect. Compared to equipment handling low-consistency pulp, the medium-consistency pressure screen has certain advantages in terms of energy consumption.

 

 

1.Screen Frame

Typically fabricated from robust and durable high-strength metal materials, such as premium high-strength alloy steel. This material selection aims to provide a strong and stable support along with a stable frame structure to withstand the significant pressure and impact forces generated by the medium-consistency pulp during the screening process.

 

The design of the screen frame undergoes precise mechanical calculations and simulation analyses, fully considering the dynamic characteristics of the internal pulp flow and the influence of external environmental factors. Its shape and size are optimized to minimize stress concentration and ensure no deformation or damage occurs during long-term and high-intensity usage.

 

To enhance the corrosion resistance of the screen frame, its surface is usually subjected to special treatments, such as applying anti-corrosion coatings or undergoing oxidation treatment to extend its service life.

 

2.Screen Plate

Manufactured using wear-resistant and corrosion-resistant special high-performance materials, such as advanced stainless steel or advanced ceramic materials. These materials possess excellent hardness and chemical stability, enabling them to maintain good performance during prolonged contact with medium-consistency pulp.

 

The screen holes on the screen plate are elaborately designed and precisely machined, evenly and finely distributed over the entire surface of the screen plate. The size and shape of the screen holes are customized based on specific screening requirements to ensure effective separation of impurities and fibers of different sizes and shapes.

 

To further enhance the screening efficiency and service life of the screen plate, its surface may undergo special treatments, such as micro-texture processing or coating treatment, to reduce pulp adhesion and clogging.

 

3.Rotor

Crafted from high-quality metal materials, such as high-strength alloy materials. The shape and blade design of the rotor are unique and sophisticated, undergoing optimization through fluid dynamics analyses to generate an ideal flow field distribution within the medium-consistency pulp.

 

The angles, shapes, and quantities of the blades are precisely calculated to ensure effective propulsion of the pulp flow during rotation, enabling full contact between the pulp and the screen plate while avoiding excessive turbulence and vortices, thereby improving the screening efficiency and effect.

 

The rotational speed of the rotor can be precisely adjusted through an advanced speed control system to adapt to different properties and concentrations of medium-consistency pulp, as well as different production process requirements and output demands.

 

4.Inlet and Outlet Ports

The inlet port is designed rationally and precisely, usually adopting a gradually expanding or diversion structure to ensure the medium-consistency pulp enters the screen uniformly, stably, and at an appropriate pressure and speed. The size and shape of the inlet port are optimized to reduce pressure loss and flow rate fluctuations at the inlet.

 

The outlet ports include the good pulp outlet and the reject pulp outlet. The good pulp outlet is typically located at the upper part or side of the screen body, designed to be smooth and spacious to ensure the screened high-quality pulp can be discharged rapidly and smoothly, reducing resistance and pressure loss. The reject pulp outlet is usually located at the bottom or a specific position of the screen body and is equipped with an adjustable valve or control device to flexibly control the discharge speed and quantity of the reject pulp based on the impurity content and process requirements during the screening process.

 

 

1.Inlet

Under the propulsion of an external pressure pump or other conveying equipment, the medium-consistency pulp enters the interior of the medium-consistency pressure screen smoothly and uniformly through a meticulously designed inlet pipeline and inlet port at a certain pressure and flow rate.

 

During the inlet process, pressure sensors and flow sensors monitor the pressure and flow rate of the inlet pulp in real-time, feeding the data back to the control system for timely adjustment and maintenance of the stability of the inlet parameters.

 

The special structure and diversion design of the inlet port enable the pulp to rapidly diffuse within the screen, forming a uniform flow state and creating favorable initial conditions for the subsequent screening process.

 

2.Screening

Once the pulp enters the screen, the high-speed rotating rotor comes into play. The blades on the rotor generate a strong centrifugal force and turbulence, creating a complex and efficient flow pattern near the screen plate.

 

Due to the size of the screen holes on the screen plate being smaller than the size of impurities and non-compliant fibers, under the combined action of centrifugal force, pressure, and turbulence, the fine fibers and liquid that meet the requirements can smoothly pass through the screen holes, while the larger impurities and non-compliant fibers are blocked on the surface of the screen plate.

 

Simultaneously, the rotation of the rotor constantly renews the contact area between the pulp and the screen plate, ensuring the continuity and efficiency of the screening process and avoiding clogging of the screen holes and a decline in the screening efficiency.

 

3.Reject Discharge

The impurities and non-compliant fibers blocked on the surface of the screen plate gradually move towards the reject pulp outlet under the continuous push of the rotor.

 

The control device at the reject pulp outlet automatically or manually adjusts the opening degree based on the preset parameters and the real-time monitoring of the screening effect to control the discharge speed and quantity of the reject pulp.

 

The discharged reject pulp can be further processed or recycled to reduce resource waste and environmental pollution.

 

 

1.Efficient Screening

Capable of processing a large amount of medium-consistency pulp in a short period, achieving efficient separation of impurities and fibers and significantly enhancing production efficiency.

 

The advanced structural design and optimized working parameters enable the screening effect to reach a high level, meeting the requirements for high-quality pulp production.

 

2.High-Precision Separation

With fine screen holes and optimized flow field control, it can precisely separate impurities and fibers of different sizes and properties, ensuring the consistency and stability of pulp quality.

 

It has excellent removal capabilities for even tiny impurities and fiber bundles, providing reliable pulp raw materials for the production of high-quality paper.

 

3.Strong Adaptability

It can adapt to different types and sources of medium-consistency pulp, including virgin wood pulp, waste paper pulp, straw pulp, etc., and has wide applicability.

 

It can flexibly adjust working parameters based on changes in the production process and differences in pulp properties to maintain stable screening performance.

 

4.Stable Operation

All components are made of high-quality materials and advanced manufacturing processes. Coupled with a reasonable structural design, the equipment can maintain stable performance and a reliable working state during long-term continuous operation.

 

It is equipped with a comprehensive monitoring and protection system that can detect the operating conditions of the equipment in real-time and promptly identify and handle potential faults and abnormal situations.

 

5.Energy Saving and Consumption Reduction

Compared to traditional screening equipment, when processing medium-consistency pulp, it can effectively reduce energy consumption and water consumption, saving production costs.

 

The optimized design and efficient operation mode reduce pulp loss and waste, improving the utilization rate of resources.

 

 

1.Papermaking Pulping Production Lines

In different pulping processes such as chemical pulping, mechanical pulping, and waste paper pulping, it is used for the screening and purification of medium-consistency pulp to improve the quality and purity of the pulp.

 

It can closely cooperate with other pulping equipment and process links to optimize the performance and efficiency of the entire pulping production line.

 

2.Paper Production

It provides high-quality pulp processed by the medium-consistency pressure screen for various types of paper production, such as cultural paper, packaging paper, household paper, specialty paper, etc., improving the physical properties, appearance quality, and printing performance of the paper.

 

It helps meet the strict requirements for pulp quality of different paper products and enhances the market competitiveness of the products.

 

3.Pulp Recycling and Reutilization

In the process of waste paper recycling and re-pulping, it conducts in-depth screening and purification of the medium-consistency waste paper pulp to remove impurities and non-compliant fibers, improving the quality and utilization rate of the recycled pulp.

 

It provides important technical support for the recycling and sustainable development of waste paper resources.

 

 

1.Operation Points

Operators need to undergo professional training, be familiar with the structure, working principle, and operation process of the equipment, and operate strictly in accordance with the operating procedures.

 

Before starting the equipment, carefully inspect the status of each component, connection conditions, and instrument displays to ensure the equipment is in a normal state.

 

Based on the properties of the pulp and production requirements, reasonably set working parameters such as inlet pressure, rotor speed, reject discharge frequency, etc., and closely monitor the operating status of the equipment during operation, adjusting parameters in a timely manner to maintain the best screening effect.

 

Regularly clean and maintain the equipment to prevent clogging of the screen holes and fouling inside the equipment.

 

2.Maintenance Points

Regularly inspect and maintain key components such as the screen frame, screen plate, and rotor, promptly detecting and replacing worn or damaged parts.

 

Regularly inspect and replace vulnerable parts such as bearings and seals to ensure the normal operation and sealing performance of the equipment.

 

Regularly inspect and maintain the electrical system and control system of the equipment to ensure its stable and reliable performance.

Establish a comprehensive equipment maintenance file, recording the maintenance history and operating conditions of the equipment to provide a reference basis for equipment management and maintenance.

 

 

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