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Pulp Cleaners

What is Pulp Cleaners

 

Cleaners in the pulp machinery are used to clean and purify the pulp made out of raw materials for paper production. The cleaning process is carried out for the removal of unwanted particles like stickies, glue, gums, wax, etc. There are different types of cleaners used in pulp making for carrying out cleaning operations of different efficiencies.

 

Benefits of Pulp Cleaners

Enhanced Paper Quality

By removing impurities, the pulp cleaner ensures the production of cleaner pulp, resulting in paper with improved strength, smoothness, and printability.

Increased Production Efficiency

Pulp cleaner leads to a more efficient papermaking process, reducing downtime caused by equipment maintenance and paper defects.

Cost Savings

Pulp cleaner equipment helps reduce the consumption of raw materials and energy, leading to cost savings for paper mills.

Environmental Impact

By optimizing paper quality and reducing waste, pulp cleaner equipment contributes to more sustainable paper manufacturing practices.

Why Choose Us
 

 

Quality Assurance
For guaranteeing product quality and on-time delivery, Beichen built new manufacturing factory in 2016 with floor area 13900㎡ in High-tech Zone. Key parts of the factory are two workshops and one warehouse together with a office building.

 

Advanced Production Equipment
With advanced production equipment, skilled technicians and scientific management, the overall production capacity realized times increase. For the ceramic cones production line, we own isostatic pressing machine, CNC grinders, electric kiln and gas kiln and skilled grinding technology. We realize the full process production all by own both for ceramic cones and stainless steel cones ceramic lining and grinding.

 

Strict Inspection
Before being shipped, each product must go through a comprehensive inspection. Every pulp cleaner, spare part, and ceramic dewatering component is rigorously evaluated to ensure that it meets the size, composition, and technical specifications outlined in the drawings.

 

Comprehensive Service
The services team form Beichen cover pre-planning, selling, technique assistance, package and deliver. We can help to provide better product solution and maintain for longer operation lifecycle of your processes and equipment. Further benefits can be provided by our service in energy saving, enhanced production efficiency.

 

Working Principles

 

Pulp stock at 0.5 to 1.0% consistency fed through inlet pipe header to the cleaners. The stock enters the tangential inlet which accelerates the stock to downward centrifugal motion. Contaminants like dirt, shives, and specks with high specific gravity are forced to the outer wall of the cone and downward through the reject outlet orifice to reject the header, the reject is again fed to the 2nd stage of cleaners. The cleaned pulp stock rises upward and goes via accept header to the upstream system, at the bottom of cleaners have dilution water headers with individual elutriation line provided to eliminate the fiber losses. 

 

Types of Pulp Cleaners
Light Consistency Hydrocyclone TC/SC 133 Pulp Cleaner
Twister Medium Consistency Hydrocyclone Pulp Cleaner
CLP700 Hydrocyclone Pulp Cleaner
RB300 High Density Pulp Cleaner

High Consistency Pulp Cleaner
High-consistency pulp cleaner is a motorized used for the efficient removal of contaminants, pollutants, and impurities like sand, glass, chips, pins, wax, etc. from the pulp stock. A visual inspection of the vortex is done through an illuminated sight glass. The installation of the high consistency cleaner is simple and easy. High consistency cleaner also protects further screening and refining equipment from wear and abrasion. The impurities having greater intensity than pulp, like stones, metal particles, nails, etc. are removed from the mixture and passed to the reject chamber.

 

Medium Consistency Pulp Cleaner
Medium-consistency pulp cleaner is also a good option to consider if you need to perform medium level operations. It works on a non-motorized designed mechanism. It is also efficient in cleaning impurities like pins, clips, staple pins, etc. Medium-density cleaner performs operations before screening, deinking and refining. Therefore it is installed before the above three. the installation is very easy and one time.

 

Low Consistency Pulp Cleaner
Low consistency pulp cleaner is suitable for purifying all kinds of fiber suspension (density 0.4~1.2%). It can not only effectively remove impurities, hot melt materials, pulp residues, etc. from the paper pulp, but also clean foamed plastic, dust cork, ink particle and air off the pulp.

 

Centrifugal Cleaners
Centrifugal cleaners are specially designed to remove air, dirt, shives, and specks from pulp stock. The process is carried out efficiently and economically without polluting the other substances. Centrifugal cleaners has a smooth internal surface and small diameter, that ensures its exceptional performance. The pulp stock enters tangentially through the inlet with a consistency rate of 0.5%-1.0%.

 

What Types of Contaminants can Pulp Cleaners Remove?
 

 

The pulp cleaners are large diameter cleaners for removing impurities like sand, metal, glass, and other heavy tramp material. The cleaners are equipped with junk traps to minimize the fiber losses. Different feed head designs provide a wide range of capacities. Fiber losses in the cleaning operation can be reduced by using specially designed cones in latter stages of cleaning. No special tools are required to install the cleaners, and wear parts can be replaced fast and easily. 

 

5 Important Parameters for Pulp Cleaner Control
 

Operating pressures
A Pressure Drop, the drop in pressure between the feed and accept headers, determines the cleaner flow capacity, and can impact removal efficiency. Generally, hydrocyclones operated at a high Pressure Drop have a better cleaning efficiency than those operated with a lower Pressure Drop; however, excessively high Pressure Drops will result in a drop off in efficiency, as the effect of decreased residence time becomes greater than the effect of the increase in centrifugal force.

The pressure differential (DP), the difference in pressure between the accept and reject headers, determines the volumetric reject rate, which can impact removal efficiency and runnability. Excessively low volumetric rejects can lead to plugging and insufficient contaminant removal, while excessively high volumetric rejects can lead to turbulence and overwhelm the lower stages with fiber.

 

Reject rate
The reject rate is an important parameter for determining cleaning efficiency. If the reject rate is too low, the cleaning efficiency will be unacceptably low. By contrast, if it is too high, the late stages of the cleaner system will require more cleaner bodies and possibly additional cleaning stages.

Reject rate can be expressed in terms of volume or weight, however only the reject rate by volume can be controlled by pressure settings. Increasing the pressure differential increases the volumetric reject rate of the cleaner and vice versa. The reject rate by volume is the percent of feed volume rejected by the cleaner, and is calculated by dividing the reject volume by the feed volume. Opening a cleaner’s reject valve or closing its accept valve increases the reject rate by volume, and thus increases the pressure differential.

 

Stock freeness
Higher freeness pulp will result in increased thickening of rejects, causing a higher reject rate by weight. Higher weight reject rates require a higher quantity of lower-stage cleaner units to maintain the desired inlet consistencies for the cleaning application.

 

Thickening factor
The thickening factor is an important measure for optimizing cleaner performance as it relates to runnability, and more specifically, plugging. Understanding the thickening factor helps to understand how much fiber is being rejected. It is the ratio of reject consistency to the feed consistency (or the reject ratio by weight divided by the reject rate by volume). Thickening factor is set by the design of a particular cleaner and is impacted by a number of variables, including fiber properties, type of contaminants, pulp temperature, freeness and more.

 

Controlled turbulence
Rejects form a mat along the wall of a cleaner. This fiber mat thickens as it moves down the hydrocyclone, causing acceptable material to get caught. To encourage a greater accept tonnage and lower the risk of plugging, efficient cleaner systems introduce controlled turbulence to the lower cone area in the form of a small pattern or set of bumps. Inducing turbulence into the flow of the cleaner often helps good material to escape to the accepts stream.

 

Twister Medium Consistency Hydrocyclone Pulp Cleaner

Precautions for Installing Pulp Cleaner

 

When install the pulp cleaner, must install the field pressure gauge, in order to check if it’s pressure drop and pressure difference conform to the standard. It’s necessary to timely readjustment.

 

Must equipped with sampling valve, to benefit check every section’s inlet pulp consistency. In necessity, readjustment pressure drop and pressure difference.

 

Guarantee each of slag remover all in valid running.

 

Check the last section’s discharge quantity and consistency.

 

Components of Pulp Cleaners
1

Inlet Chamber

The section where the pulp slurry is fed into the cleaner. It guides the flow into the cleaner body at the correct velocity and angle for effective separation.

2

Cone Section

The main chamber where the separation of contaminants from the pulp takes place. The body’s shape influences the centrifugal action needed for the cleaning process.

3

Reject Chamber

The reject chamber is where the heavier impurities that are separated from the pulp are collected. Regular maintenance and removal of these contaminants are essential for consistent equipment performance.

4

Accept Outlet

The accept outlet is the point through which the cleaned pulp exits the pulp cleaner. This purified pulp is then directed to subsequent stages of the papermaking process.

 

How to Maintain Pulp Cleaners

 

All of your equipment should be inspected regularly. While your staff can usually handle frequent wear checks, you should have an expert inspect your machinery once or twice a year for a more thorough inspection. Their goal should be to ensure all equipment is functioning properly and look for potential problems. Regularly inspect and replace worn parts, such as discharge valves, valve assemblies, and seal chambers in filtrate tanks.

 

Pulp and paper mills are known to generate a lot of dust. Dust concentrations in the working environment can not only damage equipment, but also cause air quality problems. Dust can cause overheating of critical components and inaccurate measurements. Use air wipe devices and well-designed head kits to control dust.

 

An effective preventative maintenance schedule is one that is based on exceptional record keeping. Keep a detailed log of what has been checked, what was found, and any correct actions that were taken. This can help you establish a preventive maintenance program platform to ensure your pulp cleaner operates at peak efficiency.

 

FAQ

Q: How do pulp cleaners separate contaminants from pulp?

A: The pulp cleaner employs centrifugal force to concentrate light contaminants at the air core so they can be efficiently separated from the good pulp slurry.

Q: What is the difference between high-density and low-density pulp cleaners?

A: High density cleaner: Remove various heavy impurities in pulp, such as fibers, stones, glass, etc. It is mainly adopted before coarse screen. It has different modes to meet your needs, such as manual, automatic, intermittent, continuous. Low density cleaner: Removes heavy impurities from pulp such as gravel, scrap iron, dust and large ink particles. The position is after the coarse screen. It also has open and closed sewage devices to meet different working environments.

Q: What materials are pulp cleaners typically made from?

A: Pulp cleaners can be made from a variety of materials, including stainless steel, ceramic, and durable plastic. Ceramic linings, for example, are preferred for their high resistance to wear and corrosion.

Q: What are the most common contaminants removed by pulp cleaners?

A: Pulp cleaners remove unwanted particles such as sand, glass, metal, plastic and polystyrene from pulp. These contaminants are often separated using screening processes and hydrocyclones depending on their size and density.

Q: What safety precautions should be taken when operating a pulp cleaner?

A: Wear appropriate personal protective equipment (PPE), such as safety glasses, earplugs, and protective clothing. Keep the work area clean and organized. Clutter and debris can create tripping hazards and make it more difficult to move around safely. Use caution when working near moving parts.

Q: What impact does pulp consistency have on the efficiency of pulp cleaners?

A: Low consistency allows for easier separation of contaminants, while higher consistency requires more robust cleaners and may result in higher wear and fiber loss if not properly managed.

Q: What are the signs that a pulp cleaner needs repair or replacement?

A: Signs that a pulp cleaner needs repair or replacement include a noticeable drop in cleaning efficiency, increased fiber loss, unusual noises or vibrations, and visible wear on internal components.

Q: Why are pulp cleaners essential in the paper manufacturing process?

A: High-density cleaner equipment is a critical component of the papermaking process. Its primary objective is to remove unwanted contaminants from the pulp, ensuring the production of high-quality paper.

Q: What are the main benefits of using centrifugal pulp cleaners?

A: Centrifugal pulp cleaners offer several benefits, including high efficiency in removing contaminants, reduced wear and tear on downstream equipment, minimal fiber loss, and increased pulp quality. They also have the ability to operate continuously, which contributes to an overall efficient production process.

Q: What maintenance is required for pulp cleaners to ensure optimal performance?

A: All of your equipment should be inspected regularly. While your staff can usually handle frequent wear checks, you should have an expert inspect your machinery once or twice a year for a more thorough inspection. Their goal should be to ensure all equipment is functioning properly and look for potential problems. Regularly inspect and replace worn parts, such as discharge valves, valve assemblies, and seal chambers in filtrate tanks.

Q: How does a pulp cleaner improve the overall efficiency of the paper production line?

A: Pulp cleaner machinery efficiently removes unwanted contaminants, ensuring a cleaner and more refined final product. It helps to increase the purity of the pulp. As there are no major contaminants and the pulp has gained more purity the end product quality eventually increases.

Q: Are there any environmental benefits to using pulp cleaners?

A: Pulp cleaners contribute to environmental sustainability by ensuring that contaminants are efficiently removed and disposed of properly, reducing waste in the pulp processing cycle.

As one of the leading pulp cleaners manufacturers and suppliers in China, we warmly welcome you to buy pulp cleaners made in China here from our factory. All customized products are with high quality and competitive price.

High Density Hydrocyclone HC Pulp Cleaner, High Density LC Pulp Cleaner, High Consistency Pulp Cleaner Ceramic Lining Cone