The no-load test run for decanter centrifuge is a necessary step for the inspection of decanter centrifuge. The introduction below is recommended by GN Separation.

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Common failures of Decanter centrifuge gear boxes include tooth surface wear, tooth surface gluing and abrasions, tooth surface contact fatigue, bending fatigue and broken teeth. The causes are manufacturing errors, poor assembly, poor lubrication, overload, and operational errors. Due to the characteristics of the structure and working principle of the gear, its vibration signal is very complicated, and the vibration fault diagnosis of it needs to be analyzed in both the time domain and the frequency domain. Whether the gear is in a normal or abnormal state, the frequency of gear meshing stiffness always exists.

Therefore, the gearbox should be diagnosed based on the gearing frequency component of the gear. Due to the complexity of the gear signal, the fault has many effects on the vibration signal, especially due to the effect of amplitude modulation and frequency modulation, there are many sideband structures on the vibration spectrum of the gear, which requires specific analysis during the analysis and diagnosis Components to achieve accurate diagnosis of gearbox faults.

The characteristic frequency of the Decanter centrifuge gear box failure is as follows:

1. The normal frequency spectrum shows the 1X and meshing frequencies of all the rotating shafts. There are speed sidebands on both sides of the gear meshing frequency, and the peak value is small.

2. Gear wear. The natural frequency of the gear appears, and there is a speed sideband of the shaft where the worn gear is located. When the wear is obvious, a higher peak sideband will appear near the meshing frequency.

3. Decanter centrifuge gear eccentricity. There is a sideband of higher amplitude near the meshing frequency, indicating that the gear is eccentric or the shaft is not parallel, and the peak of the meshing frequency increases with the increase of the load.

4. The decanter centrifuge gears are misaligned. The vibration of the second or higher harmonics of the meshing frequency is almost always excited, and the peak value at the 2X or 3X meshing frequency spectrum line is large, and there is a side frequency of the rotation frequency interval.

At the upcoming China International Petroleum and Petrochemical Technology and Equipment Exhibition (CIPPE), GN separation, a professional separation technology provider, will showcase its innovative 3-phase decanter centrifuge.

Show Name: CIPPE (short for China International Petroleum & Petrochemical Technology and Equipment Exhibition)

Date：March 25~27, 2024

Venue：New China International Exhibition Center, Beijing

GN Booth No.: E2168

GN 3-phase decanter centrifuge has attracted the attention of many industries with its excellent performance and unique design. Its bowl are made of duplex stainless steel 2205, and the use of centrifugal casting technology ensures the compactness of the material composition, thus achieving excellent dynamic balance performance, which is crucial for high-speed and stable operation. At the same time, the components that directly contact the processing materials are made of 316L stainless steel, ensuring the durability and corrosion resistance of the machine.

The design of this centrifuge is to efficiently separate heavy liquid phase, light liquid phase and solid residue. It uses the density difference between different materials to achieve 3-phase separation. This function benefits from the diversified centrifugal force generated by the machine, making the separation of various components more precise. The centripetal pump design adopted by the centrifuge achieves precise control over the boundaries of different liquid phases within the device, thereby meeting various separation requirements and ensuring clarity after fluid separation.

It is worth mentioning that the GN 3-phase decanter centrifuge is also equipped with a frequency conversion control cabinet, which can achieve precise control of the centrifuge’s rotational speed and feed rate by adjusting the speeds of the main motor, auxiliary motor, and feed pump. This advanced feature gives the machine high flexibility, allowing it to adapt to various complex operating scenarios.

In terms of application fields, 3-phase decanter centrifuges have broad application prospects in oil sludge treatment systems, edible oil extraction, and kitchen waste management. GN Separation is constantly meeting the growing needs of the industry by relentlessly pursuing innovative technologies and product quality.

We sincerely invite all enterprises and individuals interested in separation technology to visit the GN booth during the CIPPE exhibition to experience the powerful functions of the 3-phase decanter centrifuge and discuss future cooperation opportunities. We believe that through this exhibition, GN will continue to consolidate its leading position in the field of separation technology and contribute more to the sustainable development of the industry.

GN Separation is excited to announce its participation in the IE Expo in Shanghai next month, and cordially invites friends, customers, and industry colleagues to visit the GN booth to explore GN’s innovative products and engage in technical and commercial discussions.

Show Details:

• Show Name: IE Expo China 2024
• Location: Shanghai New International Expo Centre (SNIEC)
• Expo Date: April 18~20, 2024
• GN Booth: N4-H46\I46 (Hall 4)

During the expo, GN will showcase some of its main industrial separation and conveying equipment. Here’s a brief overview of GN’s featured products:

Sludge Dewatering Centrifuge:

GN will exhibit the GNLW554 model with a 22-inch bowldewatering decanter centrifuge. This high-speed rotating bowl utilizes centrifugal force to efficiently separate solids and liquids based on their different densities. Additionally, GN will showcase the GNLWS364 model, a 3-phase decanter centrifuge suitable for separating light liquid, heavy liquid, and solids. To enhance durability, GN utilizes tungsten carbide plates and bushings for screw blade and solids discharging port protection, thereby extending the machine’s service life.

Disc Stack Separator:

The disc stack separator, also known as a disc stack centrifuge, operates at higher speeds compared to decanter centrifuges. It is typically installed after the decanter centrifuge to separate ultra-fine solids that cannot be removed by the decanter. With the ability to generate higher centrifugal force, the disc stack separator is ideal for slurry clarifying and oil-water separation. GN emphasizes the importance of maintaining slurry feed with solids concentrations below 5% to prevent blockages and ensure smooth operation.

Solid Vacuum Pump:

GN will showcase two models of solid vacuum pump: GNSP40 and GNSP10, each offering different capacities and designs. All models feature a compact structure for easy onsite layout, with the GNSP10 model equipped with wheels for convenient mobility. These pumps operate automatically with preset suction and discharging times, while the GNSP40 model also offers manual operation. Suitable for various material transfers, including high fluidity liquids, low fluidity slurries, and solid powders and gravels, the solid vacuum pump is fully pneumatic-driven for efficient operation.

GN eagerly anticipates meeting you at IE expo China 2024 and looks forward to fruitful discussions and collaborations.

GN Separation would like to invite all of our clients and friends to join ASIA WATER 2024 Exhibition In April held In Malaysia.

Expo. Website https://www.asiawater.org

Expo. Name: ASIA WATER 2024

Add.: Kuala Lumpur Convention Centre

GN Booth No.: Hall 6, B602

Expo Time: April 23-25th, 2024

ASIAWATER 2024, the region’s leading water & wastewater platform for developing Asia, will return at the heart of modern Malaysia’s city centre, the Kuala Lumpur Convention Centre, from the 23 – 25 April 2024, with the central theme “Water and Climate Change: Innovation for Resilience”.

During this exhibition, GN will show the following equipment:

Decanter centrifuge 

Decanter centrifuge  is a widely used equipment in the field of industrial solid-liquid separation. According to the characteristics of different materials in different industries, GN decanter centrifuge is divided into dewatering, separation, and clarifying decanter centrifuge. With centripetal pump technology, GN decanter centrifuge can also realize the 3-phase separation of liquid, liquid, and solids. GN will bring 2-phase decanter centrifuge GNLW223 to the exhibition.

GN Solids Vacuum Pump  

If you are having a headache when moving high viscosity drilling cuttings, then GN Solids Vacuum Pump is the best choice. GN has built 3 different models: GNSP-10B, GNSP-20B and GNSP-40B. We will show GNSP-10B at the exhibition.

Sludge dewatering screw press

GN screw press sludge dewatering machine is a kind of economic and environmental friendly sludge dewatering equipment. It is a new type of sludge extrusion dewatering equipment by using the principle of screw extrusion, through the strong squeezing force generated by the change of screw diameter and screw pitch, and the tiny gap between the floating ring and the fixed ring, to realize solid-liquid separation.

All of the clients of GN are welcome to visit the ASIA WATER 2024 EXHIBITION. We hope we will have a fruitful meeting and a happy Cooper with you. If you need any support about the operation and maintenance of GN’s equipment, please feel free to contact GN company for our engineers’ best experience and knowledge in the relevant industry. We will do our best to assist your project because just in this way we can establish a stable and long term cooperation. And we can provide on-line support and site instruction for specific situation if needed.

This week, GN Separation successfully carried out running testing and delivered two sets GNLW224 decanter centrifuges to the customer in Australia.

The GNLW224 decanter centrifuge, a star product of GN Separation, has garnered significant attention due to its exceptional functionality and versatile applications across various industries. Whether it’s sludge dewatering, industrial solid-liquid separation, or oil sludge treatment, this centrifuge exhibits outstanding performance. It’s not just an efficient machine but also an innovative solution that offers a more environmentally friendly and efficient approach to industrial waste treatment and resource recovery.

20240223_sludge_dewatering_centrifuge

In the field of sludge treatment, the GNLW224 decanter centrifuge can rapidly remove excess water from sludge, significantly reducing its volume and facilitating subsequent processing or reuse. In terms of industrial solid-liquid separation, it precisely separates solids from liquids, ensuring maximum recovery and utilization of valuable resources.

Besides of its impressive performance, these centrifuges are equipped with a range of advanced features, including ABB motors, bearing temperature sensors, and vibration sensors. The implementation of these cutting-edge technologies provides a robust foundation for the efficient and stable operation of the centrifuges. Notably, the bowl is made of duplex stainless steel 2205, a material renowned for its excellent corrosion resistance and wear resistance, ensuring the centrifuge’s longevity and reliable operation.

This successful delivery underscores GN Separation’s prominent position in centrifuge technology and highlights the company’s keen insight and responsiveness to global industrial market demands. As the global industrial landscape continues to evolve, GN Separation remains committed to developing innovative and reliable solutions that contribute to industrial growth and environmental protection.

Let’s eagerly anticipate more outstanding achievements from GN Separation in the industrial sector in the coming years!

News from GN company this week: Recently, 2 sets of Decanter centrifuge (Model GNLW224) have been manufactured and ready to start serving for an Australian project.

According to the customer’s requirements, ABB brand motors, bearing temperature sensors and vibration sensors are equipped to the decanter centrifuges which comply with IEC Ex explosion-proof standards. In order to make sure this series of Decanter centrifuges will provide a reliable performance and the parts and components of all the equipment will run smoothly for a long term operation, our technical department, production department and quality control department have paid a lot of attention to the material selection, material preparation, every step of production and the inspection for this set of equipment in each step.

As a premier manufacturer specializing in separation and conveying equipment, GN places utmost importance on product quality and the enduring advantages it offers to our valued users. We proudly introduce GN as an esteemed expert in the realm of decanter centrifuges, where meticulous attention is given to the selection of raw materials. Utilizing top-grade centrifugal casting or forging stainless steel materials ensures durability, while implementing hard alloy protection for wearing parts enhances longevity.

At GN, our commitment to precision extends to our manufacturing processes, where state-of-the-art CNC lathes, CNC centers, and CNC gantry milling machines guarantee unparalleled machining accuracy for centrifuge components. When it comes to the dynamic balance of our decanter centrifuges, we go above and beyond by employing a high-speed dynamic balance process alongside the standard low and medium-speed dynamic balancing methods. This meticulous approach ensures optimal performance by dynamically balancing the centrifuge screw and bowl at operational speeds, thereby elevating efficiency and reliability.

With our comprehensive range of decanter centrifuges, GN has made significant strides in various industries worldwide. Our products have garnered widespread acclaim, with a global footprint spanning over 60 countries and regions. The trust and satisfaction expressed by our esteemed customers serve as a testament to the superior quality and performance of GN decanter centrifuges.

Processing any equipment will definitely produce tolerances. The higher the processing accuracy, the smaller the tolerances, but the processing cost is greatly increased. The Decanter centrifuge is designed to use a variety of knowledge to achieve a certain processing error, so that the decanter centrifuge’s vibration is controlled within the normal range. However, if the user uses it improperly, it will destroy this design balance and cause serious accidents. Only when the working speed of the decanter centrifuge is not the critical speed, the rotor can move smoothly. For low-speed decanter centrifuges with a low working speed, the critical speed is generally increased as much as possible, so that the Decanter centrifuge operates below the critical speed. The shaft of this decanter centrifuge is very thick and has high rigidity, which is called a rigid shaft. When the speed requirement is very high, reduce the critical speed as much as possible. The shaft is made thinner and the rigidity is small. It is called a flexible shaft. Modern decanter centrifuges all use flexible shafts.

The critical speed is related to the Decanter centrifuge and the rotor used. A decanter centrifuge can be equipped with several kinds of rotors, so when designing a decanter centrifuge, the tolerance of the decanter centrifuge’s vibration reduction design to various rotors should be considered. The working range of the decanter centrifuge is very wide, from several thousand revolutions/minute to tens of thousands revolutions/minute. The higher the rotation speed at which the decanter centrifuge vibration occurs, the greater the danger. Once the vibration occurs at high speed, the decanter centrifuge should be stopped at the fastest speed down gear, and all personnel should leave the scene quickly to avoid personal injury in the event of shaft breakage. Never cut off the power. Once the power is cut off, the brake (rapid deceleration) will be gone and the rotor will stall very slowly. Accidents are generally caused by improper operation of the decanter centrifuge, such as the rotor is not placed on the main shaft, the rotor cover is not covered, the swinging basket of the rotor is not placed, etc. Modern decanter centrifuges generally have unbalanced protection functions. Once the vibration of the rotor is greater than a certain size when the decanter centrifuge is started, the decanter centrifuge will automatically slow down and stop. The decanter centrifuge with this performance sometimes misses the report and cannot ensure that no accidents will occur.

The screw conveyor machining errors and decanter centrifuge installation errors will cause the conveyor  centroid to deviate from the decanter centrifuge main shaft to varying degrees, therefore, vibrations will occur when the rotor rotates, and these vibrations will be inherent to the decanter centrifuge drive system at certain specific speeds The frequency resonates, causing strong vibration of the entire system. The speed at which this phenomenon occurs is called the critical speed. The rotor will cause vibration when rotating at high speed, but the flexible shaft has an “self-aligning effect”. The principle of action is that the rotor produces a disk effect when rotating at high speed, and the elastic reaction force when the flexible shaft bends pulls the rotor that deviates from the geometric centerline of the main shaft back to the geometric centerline of the main shaft, and the vibration disappears. The amount of unbalance existing in the rotor at this time must also have a certain limit, beyond which the vibration will not disappear.

News from GN company this week: Recently, 1 set of Decanter centrifuge (GNLW364-VFD with VFD control panel and a Polymer Dosing Unit GNSJY3000) have been manufactured and ready to start serving for an overseas Chemical dewatering project.

To make sure this series of Decanter centrifuges will provide a reliable performance and the parts and components of all the equipment will run smoothly for a long term operation, our technical department, production department and quality control department have paid a lot of attention to the material selection, material preparation, every step of production and the inspection for this set of equipment in each step.

As a leading manufacturer of separation and conveying equipment, GN consistently prioritizes product quality and considers the long-term benefits for our users. We take pride in introducing GN as a professional manufacturer in the field of decanter centrifuges, placing significant emphasis on the selection of raw materials. High-quality centrifugal casting or forging stainless steel materials are utilized, and for wearing parts, hard alloy protection is implemented.

The use of advanced CNC lathes, CNC centers, and CNC gantry milling machines at GN ensures superior machining accuracy for centrifuge parts. Regarding the dynamic balance of the decanter centrifuge, in addition to the standard low and medium-speed dynamic balance, GN employs a high-speed dynamic balance process. This process dynamically balances the centrifuge screw and bowl at the actual working speed, enhancing overall performance.

In terms of market applications, GN decanter centrifuges find widespread use across various industries. Our products have been exported to over 60 countries and regions globally, earning high praise from satisfied customers.

If you need any support about the operation and maintenance of GN’s equipment like Portable Decanter centrifuge, please feel free to contact GN company for our engineers’ best experience and knowledge in the relevant industry. We will do our best to assist your project because just in this way we can establish a stable and long term cooperation. And we can provide on-line support and site instruction for specific situation if needed.