Pusher Centrifuge

Introduction to Pusher Centrifuge

یکی از مؤثرترین و پرکاربردترین تجهیزات در فرایند جداسازی فاز جامد از مایع در صنایع مختلف، سانتریفیوژ پوشر یا سانتریفیوژ پیوسته Continuous است که در صنایع به عنوان سانتریفوژ پوشر نیز شناخته می شود. این دستگاه با طراحی خاص و عملکرد پیوسته، نقش کلیدی در افزایش راندمان، کاهش زمان توقف خط تولید و بهینه‌سازی مصرف انرژی ایفا می‌کند. اگر از خود می‌پرسید سانتریفیوژ پوشر چیست، باید گفت این تجهیز، یک دستگاه جداساز صنعتی پیشرفته است که به‌صورت مداوم مخلوط‌های جامد-مایع را تفکیک کرده و مواد را در وضعیت نیمه‌خشک یا خشک‌شده تحویل می‌دهد.

Structure and operation of a pusher centrifuge

A pusher centrifuge consists of several main parts that work in harmony with each other. These parts are:

• Basket
• Pusher
• Hydraulic or electromechanical system for moving the basket
• Feed Tube
• Distributor
• Solids discharge system
• Main Body

How is the separation process done?

The process is as follows:

1. Feed entry: First, the suspension (solid-liquid mixture) is fed into the basket through the feed tube.
2. Uniform distribution: With the help of a special distributor, the materials are evenly distributed over the inner surface of the basket.
3. Dewatering and separation: Under the influence of centrifugal force, the liquid phase passes through the gaps or holes in the basket wall, and the solid phase remains on the surface in the form of a cake.
4. Washing: If necessary, jets of water are sprayed on the cake to remove impurities or soluble materials.
5. Continuous cake movement: The basket, with its reciprocating motion, guides the solid cake forward and finally ejects it from the basket.

Advantages of using a pusher centrifuge

Using this type of centrifuge has many advantages:

• Continuous and non-stop operation
• High capacity in material separation
• Low energy consumption
• Ability to wash the cake during operation
• Possibility of precise control of process parameters
• Long service life with anti-corrosion material
• Suitable for crystalline, fibrous and powdery materials

Used Material

Given the direct contact of certain parts of the machine with the process materials, selecting a corrosion-resistant material is highly important. Typically, the components that come into contact with the feed are made of the following materials:

• Stainless Steel: The most common alloy for machine construction due to its resistance to corrosion, especially in humid and chemical environments.
• Duplex Steel: A combination of high mechanical and anti-corrosion properties.
• Super Duplex: Suitable for processes with severe corrosion and high temperatures.

Read more about the types of materials used and their resistance to corrosion.

This variety of materials allows the device to be used in a wide range of industries and increases its useful life.

Pusher Centrifuge types

Different models of pusher centrifuges are classified based on their internal design, type of motion, number of baskets, type of controller, and operating capacity. The main models include:

Single Stage Centrifuge

In this model, there is only one basket, and all separation and discharge stages take place within this single stage. This type is suitable for simpler products and lighter processes.

Two-stage centrifuge

In this model, separation takes place in two consecutive baskets. This design enhances dewatering efficiency and results in a higher-quality final cake.

Custom models with electronic control

In this type, full control over the rotational speed, reciprocating pulse frequency, and feed injection is achieved through a PLC and monitoring systems.

Applications of pusher centrifuges in various industries

Thanks to its unique design, the pusher centrifuge is used in a wide range of industries. Below, we’ll take a look at some of its most important applications:

Chemical industry

In the chemical industry, this equipment is used for separating crystals, fibers, and powders produced from chemical reactions or crystallization processes. Common materials that are separated with a pusher centrifuge in this industry include:

• Sodium sulfate
• Ammonium sulfate
• Potassium chloride
• Potassium nitrate
• Ammonium bicarbonate

Mining industries

In the mining and mineral processing sector, pusher centrifuges are used for recovering and drying valuable minerals such as:

• Salt
• Magnesium sulfate
• Kaolin
• Barite

obtain more information about the design and construction of a refined salt production line and a hydromill-based salt production line.

Petrochemical and refinery industries

Processes such as the purification and recycling of chemical materials in refineries and petrochemical plants require highly precise and stable equipment. The pusher centrifuge plays a significant role in these applications.

Food and pharmaceutical industries

In the production of sensitive and hygienic products such as gelatin, sugar, and starch, as well as in the pharmaceutical industry for drying active compounds, the use of pusher centrifuges is common.

Environmental industries

In industrial and municipal wastewater treatment, pusher centrifuges are used for dewatering sludge or separating suspended solids.

Comparison of pusher centrifuges with other types of centrifuges

Decanter Centrifuge

• Operation: Continuous separation of materials using centrifugal force and an internal screw.
• Advantages: Suitable for three-phase systems (solid–liquid–liquid).
• Comparison: The pusher centrifuge is more suitable for crystals.

Filter Press Centrifuge

• Operation: Batch separation using a filter and pressure.
• Comparison: The pusher centrifuge is much more efficient in continuous production lines.

Disc Centrifuge

• Operation: Rapid separation of liquids with different densities.
• Comparison: It has a different application and is more suitable for liquid phases.

Pusher centrifuge maintenance, repair, and troubleshooting tips

Maintenance tips

• Inspection of baskets, screws, and bearings
• Inspection of the hydraulic system and lubricants
• Periodic calibration of the PLC

Common problems and solutions

New applications of pusher centrifuges

• Lithium batteries: Separation of lithium crystals
• Waste recycling: Separation of hazardous solids
• Biotechnology: Drying organic fertilizers

Frequently Asked Questions About Pusher Centrifuges

Can the pusher centrifuge be used for any type of crystal?
Yes, with the proper design of the basket, this device can be used in various industries.

What is the difference between this device and discontinuous models?
Continuous operation and high speed are features of the pusher centrifuge, which lead to increased efficiency and reduced energy loss.

Does it require a permanent operator?
No, operator presence is only required during the initial startup and inspection stages. This machine is fully automatic.

Is it possible to upgrade parts?
Yes, all parts are replaceable, repairable, or upgradeable, and Pars Poolad Sepid provides after-sales service to valued customers for up to 10 years.

Pars Polad's services about pusher centrifuges

Pars Poolad Sepid, with a brilliant track record, is a designer and manufacturer of various types of pusher centrifuges tailored to the needs of different industries. Design based on the Sulzer model, use of durable materials, and comprehensive after-sales service are among the advantages of choosing this company.

Parts supply

In addition to designing and manufacturing pusher centrifuges, Pars Poolad Sepid is also prepared to supply spare parts and auxiliary equipment, as well as provide service and refurbishment for old and worn-out centrifuge components.

• Sieve Segment
• Washing baskets
• Hydraulic pump
• Cast iron parts
• Pilot piston
• Large shaft
• Small shaft
• Bearings and …

Conclusion

With its engineered design, continuous operation, and high adaptability, the pusher centrifuge is considered a reliable choice for solid–liquid separation processes across various industries. For purchase consultation or to obtain more information, please contact the experts at Pars Poolad Sepid.