Roots blowers are mainly used for oxygenation and water circulation in aquaculture, and are one of the key equipment for intensive aquaculture such as fish ponds, shrimp ponds, and factory farming. The following is a detailed explanation of the application of Roots blowers in aquaculture:
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**1. Core role**
-Oxygenation: Air is forcibly injected into the water through an aeration system (nanotubes, microporous aeration discs, etc.) to increase dissolved oxygen (DO) and meet the requirements of high-density aquaculture.
-Promote water flow: prevent water stratification (temperature difference, uneven dissolved oxygen), and avoid harmful substances (such as ammonia nitrogen and hydrogen sulfide) produced by anaerobic fermentation at the bottom.
-Energy saving and stable: Compared to centrifugal fans, Roots blowers have higher efficiency in low-pressure (0.1~0.5 bar) scenarios and are suitable for large-scale ponds or deep water aquaculture.
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**2. System composition**
-Roots blower host: Usually choose models with low pressure and high air volume (such as 50-100 m3/h, pressure 0.3-0.5 bar).
-Aeration device:
-Nano aeration tube: Micro porous diffusion, high oxygenation efficiency, suitable for precision aquaculture tanks.
-Aeration disc/aeration head: With a large coverage area, it is suitable for large ponds.
-* * Gas transmission pipeline * *: PVC or PE pipe is used to connect the fan and aeration equipment, which shall be UV resistant and anti-aging.
-* * Control system * *: The frequency converter adjusts the air volume and cooperates with the dissolved oxygen sensor to achieve automatic oxygenation.
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**3. Key parameters for selection**
|* * Parameter * * | * * Reference Range * * | * * Explanation * *|
|------------------|--------------------------|-------------------------------------------------------------------------|
|* * Airflow * * | 0.5-100 m3/min | Calculated based on water volume and aquaculture density (e.g. 1-2 m3/h airflow is required for 1 ton of fish)|
|Pressure * * | 0.1-0.5 bar | For every 1 meter increase in water depth, the pressure needs to increase by 0.1 bar|
|* * Power * * | 0.75-30 kW | The larger the air volume and pressure, the greater the power demand|
|* * Noise * * |<75 dB (preferably silent type) | The breeding farm should avoid noise stress|
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**4. The choice between water cooling and air cooling**
-* * Wind cooled Roots blower * *:
-Advantages: Simple structure, easy maintenance, and low cost.
-* * Applicable scenarios * *: Small scale farms, intermittent operation (such as 6-8 hours of oxygenation per day).
-Water cooled Roots blower:
-Advantages: Good heat dissipation, suitable for 24-hour continuous operation, and longer lifespan.
-* * Applicable scenarios * *: Large high-density aquaculture, high-temperature areas, or closed circulating water systems (RAS).
>Suggestion: If the daily operation exceeds 12 hours or the ambient temperature is greater than 35 ℃, choose water-cooled models first.
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**5. Key points for installation and maintenance**
-* * Installation * *:
-The fan should be placed in a dry and ventilated area, above the water surface (to prevent backflow).
-The aeration pipes are evenly distributed at the bottom of the pool, with a spacing of 1.5-2 meters.
-* * Maintenance * *:
-Regularly clean the air filter to prevent dust blockage.
-Check the lubricating oil (water-cooled models require monitoring of cooling water flow).
-Winter antifreeze (the water cooling system needs to be emptied or filled with antifreeze).
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**6. Common Problems and Solutions**
-Problem 1: The increase in dissolved oxygen is not significant**
-Reason: Blockage of aeration tube, insufficient air volume, or mismatched water depth and pressure.
-Solution: Clean the aeration tube and recalculate the fan pressure requirement.
-Problem 2: Fan overheating**
-Reason: Continuous overload operation or cooling system failure (water-cooled type).
-Solution: Install a cooling fan or switch to a water-cooled model.
-Problem 3: Excessive noise**
-Reason: Fan vibration or muffler failure.
-Solution: Strengthen the base and replace the sound-absorbing cotton.
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**7. Economic suggestions**
-Variable frequency control: automatically adjusts the speed based on dissolved oxygen data, saving energy by more than 30.
-Multi machine parallel connection: Large scale breeding farms can use multiple low-power fans in parallel for flexible start stop.
-Brand selection: Domestic brands (such as Changsheng) offer high cost-effectiveness, while imported brands (such as Changsheng) are suitable for high demand scenarios.
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If a more specific selection plan is needed (such as calculating fan power based on pond area), the following information can be provided for further analysis:
1. Volume of aquaculture water (m3) or pond area multiplied by average water depth;
2. Types and densities of aquaculture (such as tons/acre);
3. Do you need 24-hour oxygenation.
