What Is Slurry Pump Applications?
Shijiazhuang Minerals Equipment Co., Ltd. develops and produces slurry pump applications for various application upon request. Its design starts with considering the needs of the user, but it is added with fashion, style, and personality thereafter, which makes the product aesthetic, fashionable, and practical. As product design, manufacturing processes, materials, and technology continue to improve, the product will be improved accordingly, showing a wider application in the future.
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In the applications of Slurry Pumps, frequency conversion operation is sometimes required. For example, direct coupling connection must be achieved at some sites, or flowrate is unstable at other sites, or the transport distance is relatively long etc.. Hence, frequency converters are needed to adjust the speed of the slurry pump so that the pump discharge pressure matches the actual required one.
In the process of frequency conversion, people often consult about the lowest frequency: someone says it’s 25Hz, some says 30Hz, and some says 5Hz. Are these parameters correct? What is the exact value? The inaccurate setting of the minimum frequency in the control system will affect the normal operation of the slurry pump.
In fact, the above three frequency values come from two aspects. One is the driving equipment of the pump, i.e. the motor and another is the slurry pump itself.
I: the minimum operating frequency of VSD motors
1. Speaking of theory alone, the lowest operating frequency that a VSD motor can run is 0Hz, but a 0HZ motor has no speed, so this cannot be regarded as the lowest operating frequency;
2. The allowable operating speed range of different VSD motors is different;
3. To put it simply, if the speed regulation range of the VSD motor is 5-50Hz, then the minimum allowable operating frequency of the variable frequency motor is 5Hz;
4. The reason why the variable frequency motor can run at multiple frequencies.
(1) The VSD motor has good heat dissipation performance. Its cooling and ventilation system are driven by independent wiring. It can be forced to dissipate heat to ensure that the VSD motor can operate at different frequencies. The motor can generate heat and dissipate in time;
(2) The insulation performance of the VSD motor is good, and it can take in the impact that has on the VSD motor, from the different current and voltage of different frequencies.
5. It is not recommended to run the variable frequency motor at low frequency. After the motor runs at low frequency for a long time, it is particularly prone to heat generation, which will cause the motor to burn out. The best operating frequency of the motor is to work close to the constant operating frequency.
6. The frequency conversion range of the commonly used frequency converter is 1-400HZ; but in practical application, considering that the standard of the Chinese motor is planned according to the power frequency of 50HZ, the application is in fact limited within the range of 20-50HZ.
Therefore, the minimum allowable frequency of the variable-frequency motor is related to the specific operating frequency range of the variable-frequency motor. Generally, the lowest value that the VSD motor allows can be taken.
II: the minimum operating speed of slurry pumps
Each slurry pump has its own performance curve, which specifies the minimum operating speed of the pump. Only when the speed is higher than the specified speed, the pump can operate normally. The frequency at this speed is the minimum operating frequency of the slurry pump.
Of course, there are other influences such as the flow rate of pipelines. Simply put, it can be considered that the above two points, that is, the frequency determined by the minimum speed of the slurry pump and the minimum operating frequency of the variable frequency motor are the two factors that affect the minimum operating frequency of the slurry pump. Among these two factors, the highest frequency value is the minimum operating frequency of the slurry pump.
The material selection of the impeller of the slurry pump should be determined according to the specific working conditions and the characteristics of the conveying medium.
Slurry pump impellers are available in a variety of materials, including high chromium cast iron, rubber, polyurethane and Stainless Steel. Each material has its specific advantages and application scenarios:
1.High chromium alloy cast iron: has good wear resistance and corrosion resistance, high hardness, can effectively resist the wear of solid particles. Suitable for conveying high concentration and high hardness slurry.
2.Rubber: has good wear resistance and corrosion resistance, can effectively reduce the noise and vibration of the pump. Suitable for conveying slurry containing corrosive media, such as acid and alkali solution.
3.Polyurethane: has high wear resistance and corrosion resistance, suitable for conveying high concentration, high hardness slurry, with a long service life.
4.Stainless-Steel:
In addition, the material of the slurry pump impeller also includes Cr26 material (high chromium alloy material), which is usually used for desulfurization and other projects. Other metal materials such as A07, A49 and A05 also have their own characteristics, A07 material has a strong abrasion resistance, suitable for strong abrasive conditions; A49 material has high chromium alloy wear resistance and good corrosion resistance, especially suitable for a variety of working conditions such as metallurgy, power plants, coal mines, etc. A05 material price is more civilian, wear resistance is better, a wide range of applications. The corrosion resistance of rubber is better than that of metal flow parts, and it is suitable for particles containing solid particles in the slurry and smooth and without sharp corners.
In summary, the material selection of the impeller of the slurry pump should be determined according to the specific use environment and medium characteristics to ensure the performance and life of the pump.
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Slurry pumps are primarily used in industrial sectors such as metallurgy, power generation, coal, and mining to transport slurries. These pumps handle mixtures containing solid particles, demanding that proper operating guidelines be followed.
To reduce the risk of clogging when processing slurries with high impurity content (e.g., mud), place a filter screen at the inlet. This minimizes the impurity particle entry, extends the pump’s lifespan, and prevents blockages. If a backup pump is available, alternate between pumps to avoid prolonged continuous operation.
Ensure the pump is placed on a stable surface during operation. For submersible slurry pumps, the pump structure has to be immersed in the water while the motor is above water to maintain stability.
For pumps with mechanical seals, always supply shaft seal water and never run them dry to prevent seal damage. Start the seal water before operation and continue supplying it for at least 3 minutes after shutdown.
In mining applications, slurry pumps often process rough ore, leading to significant wear. Lifespan varies based on ore hardness and particle size.
To reduce the risk of clogging when processing slurries with high impurity content (e.g., mud), place a filter screen at the inlet. This minimizes the impurity particle entry, extends the pump’s lifespan, and prevents blockages. If a backup pump is available, alternate between pumps to avoid prolonged continuous operation.
Ensure the pump is placed on a stable surface during operation. For submersible slurry pumps, the pump structure has to be immersed in the water while the motor is above water to maintain stability.
For pumps with mechanical seals, always supply shaft seal water and never run them dry to prevent seal damage. Start the seal water before operation and continue supplying it for at least 3 minutes after shutdown.
In mining applications, slurry pumps often process rough ore, leading to significant wear. Lifespan varies based on ore hardness and particle size.
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Contact: Ms.Serena Zhang
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Email: sales@cnsmepump.com
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Add: 260# West Huaian Road, Shijiazhuang, Hebei, China. 050051.
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