Okay, 75 kilowatts (kW) is a very common power level in Roots blowers, usually corresponding to medium to large models, and is the backbone power equipment for many industrial projects.
The following is information about the 75kW Roots blower.
1、 Main features
1. * * Medium power main * *: The 75kW fan is very balanced in terms of air volume, pressure, and applicability, and is a core equipment in fields such as sewage treatment and pneumatic conveying.
2. Cooling method: Depending on the working pressure, it may be either air-cooled or water-cooled.
** * Air cooling * *: Usually used for working pressures * * ≤ 58.8 kPa (0.6 kgf/cm2) * *. The chassis is equipped with heat sinks.
** * Water cooling * *: Usually used in working conditions where the working pressure is ≥ 58.8 kPa, or in situations where the ambient temperature is high and continuous high load operation is required for a long time. The model identification usually includes an "S" (such as CSR125, CSR150).
3. * * High reliability * *: Designed for 24-hour continuous industrial operation, the structure is sturdy and durable.
4. * * Major energy consumer * *: It is the "electric tiger" of the factory, and its operational efficiency and energy-saving measures are crucial.
2、 Typical performance parameter range
**Core Tip: The air volume and pressure of a Roots blower are inversely proportional. A 75kW fan corresponds to a performance range.
|Parameter Name | Parameter Range | Description|
| :--- | :--- | :--- |
|* * Rated power * * | * * 75 kW * * | Rated power of the drive motor, approximately 100 horsepower. |
|* * Airflow (flow rate) * * | * * 25-50 m3/min * *<br>* * (1500-3000 m3/h) * * | * * Core parameters. **The range is large, and the specific value depends on the work pressure. The higher the pressure, the smaller the air volume. |
|* * Rated pressure * * | * * 9.8-78.4 kPa * *<br>* * (0.1-0.8 kgf/cm2) * *<br>* * (1-8 meters of water column) * * | * * Core parameters. **The fan can operate within this pressure range. **The actual pressure is determined by the resistance of the backend system. ** |
|* * Imported caliber * * | DN100- DN150 | Common imported sizes, such as CSR125, CSR150, and other models. |
|The cooling method * * | * air-cooled or water-cooled * * | depends on the pressure and working system (see above). |
|* * Noise level * * | 90-105 dB (A) | The noise is very loud, * * inlet and outlet mufflers must be installed * *, usually requiring the construction of an independent fan room. |
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Performance Table Example: Correspondence between Pressure and Airflow
The following table shows the approximate air volume that a 75kW fan can provide at different pressures:
|Working pressure (kPa) | Working pressure (meters of water column) | Approximate air volume range (m3/min) | Suggested cooling method|
| :--- | :--- | :--- | :--- |
|19.6 | 2 meters | 45-50 | air-cooled|
|34.3 | 3.5 meters | 38-43 | Air cooled|
|49.0 | 5 meters | 32-37 | air-cooled/water-cooled|
|58.8 | 6 meters | 28-32 | Usually requires water cooling|
|68.6 | 7 meters | 24-28 | Water cooling|
|78.4 | 8 meters | 20-24 | Water cooling|
*Note: The above are estimated values, and there may be slight differences in wind turbines of different brands and models. *
**For example:**
*If you need a pressure of * * 68.6kPa (0.7 kgf/cm2, 7 meters of water column) * *, then a 75kW fan can provide approximately * * 26 m3/min * of air volume.
*If you only need a pressure of 39.2kPa (0.4 kgf/cm2, 4 meters of water column), then the same 75kW fan can provide an air volume of 40 m3/min.
3、 Standard configuration and important accessories
A complete 75kW Roots blower unit typically includes:
1. * * Fan host * *: including a 75kW motor.
2. * * Imported muffler * *: effectively reduces intake noise, * * required option * *.
3. * * Export muffler * *: reduces exhaust pulse noise, * * required option * *.
4. * * Valve * *: * * is essential * * to prevent damage to fans and pipelines caused by excessive pressure during system blockage. The pressure setting value should be adjusted according to the pressure that your system can withstand.
5. * * Pressure gauge * *: monitors the operating status of the fan.
6. * * Elastic joint * *: Connect pipes to reduce vibration transmission.
7. * * Anchor bolts and common base * *: Integrate the fan and motor on a sturdy base.
**For water-cooled models, it is also necessary to note that a complete cooling water system (water pump, pipeline, cooling tower or heat exchanger) must be provided, and it is strictly prohibited to start and operate without cooling water! **
4、 Common application areas
75kW wind turbines are the mainstay of medium-sized application scenarios:
** * Sewage treatment * *: Aeration tank oxygen supply for medium-sized urban sewage treatment plants.
*Pneumatic conveying: Conveying powder or granular materials such as cement, fly ash, and grains.
*Aquaculture: oxygenation system for large-scale aquaculture bases.
*Chemical smelting: providing high-pressure combustion air for medium-sized smelting furnaces and combustion furnaces.
*Paper industry: pulp mixing and blowing.
5、 Selection and usage precautions (very important!)
1. * * Selection * *: Provide the supplier with * * required air volume (m3/min) * * and * * working pressure (kPa or mH2O) * *. For example, "I need a fan to provide at least 30 cubic meters of air per minute under a pressure of 6 meters of water column
2. * * Avoid overpressure * *: * * It is strictly prohibited to adjust the air volume by turning down the outlet valve! **This will cause a surge in pressure and the motor to overload and burn out.
3. * * Variable Frequency Drive (VFD) must be configured * *: For high-power fans like 75kW, * * it is strongly recommended that a VFD must even be configured * *.
*Energy saving: Adjust the air volume according to actual needs (such as dissolved oxygen in sewage treatment), which is the energy-saving point (usually saving 20-35% energy).
*Soft start: Smooth start, significantly reducing the impact of starting current on the power grid.
4. * * Daily Maintenance * *:
** * Regularly check/replace air filters * * (check monthly, replace immediately if clogged). This is the most common reason for insufficient air flow and high energy consumption.
*Regularly replace gear oil (replace after the first 200 hours of operation, and then every 2000 hours or six months thereafter).
*Check the tension and wear of the belt (if it is a belt driven type).
*Monitor abnormal noise and vibration.
summary
**The 75kW Roots blower is a powerful and widely used medium-sized industrial power source. Its procurement and operation are important investments.
**The key to success lies in:
1. Selection of * * (based on air volume and pressure).
2. * * High quality configuration * * (including frequency converter, muffler, valve).
3. * * Professional installation * * (solid foundation, correct pipeline connection).
4. * * Standardized maintenance * * (especially regular replacement of air filters and lubricating oil).
When purchasing, please make sure to choose a reputable brand and request the supplier to provide a detailed performance table and a complete configuration list based on your operating parameters.
