Roots blower is a type of volumetric gas conveying equipment, whose core purpose is to meet the needs of industrial processes such as gas supply, pressurization, and vacuuming by forcibly conveying gases (such as air, biogas, inert gases, etc.). The following is a detailed explanation of its specific uses and typical application scenarios:
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**1、 Core functions**
1. * * Constant flow gas delivery**
-No matter how the pipeline pressure changes, the Roots blower can maintain a stable gas flow rate (flow rate is proportional to speed), suitable for scenarios where gas volume needs to be controlled.
2. * * Low pressure boosting**
-Provide an exhaust pressure of 0.1~0.8 bar (10~80 kPa) to overcome pipeline resistance or liquid level pressure (such as sewage treatment aeration).
3. * * Vacuum assisted**
-Generate * * low vacuum degree * * (usually -20~-50 kPa) through suction, used for vacuum packaging, material adsorption, etc.
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**2、 Specific application scenarios**
**1. Environmental Protection and Sewage Treatment**
-Aeration oxygen supply: Inject air into the sewage tank to promote microbial decomposition of organic matter (such as activated sludge process).
-Biogas pressurization: Transport the biogas produced by anaerobic fermentation to the generator set or gas storage tank.
-Backwash: Clean the filter or membrane components to prevent clogging.
**Features: Requires corrosion resistance (stainless steel shell) and anti clogging (intake filter).
**2. Chemical and Petroleum**
-Gas transportation: Transporting chlorine gas, hydrogen gas, sulfur dioxide, etc. (requiring explosion-proof design).
-Gas supply for reaction kettle: Provides oxidant or inert gas protection for chemical reactions.
-* * Vacuum Distillation * *: Assisted vacuum extraction to improve separation efficiency.
**Attention: Corrosive gases require PTFE coated rotors or titanium materials.
**3. Mining and Metallurgy**
-Carbon slurry leaching (CIP/IL): Inject air into the gold containing slurry to enhance the cyanide reaction.
-Floatation machine inflation: Generate bubbles to separate mineral particles.
-Blast furnace injection: conveying coal powder or combustion air.
**Requirement * *: Wear resistant (rotor hardening treatment), dustproof (filter).
**4. Food and Medicine**
-Fermentation oxygen supply: Microbial cultivation in beer, soy sauce, and production.
-Powder conveying: Non polluting conveying of flour, milk powder, and medicinal powder (oil-free design).
-Nitrogen filling in packaging: Replace oxygen inside the packaging to extend the shelf life of food.
**Hygiene standard: The material should be 304 stainless steel, with a polished surface (Ra ≤ 0.8 μ m).
**5. Electricity and Energy**
-Biomass power generation: Transporting combustible gases generated by the gasification of straw.
-* * Desulfurization system * *: Provides oxidizing air to the absorption tower.
-* * Garbage incineration * *: Supply of combustion air.
**High temperature adaptation * *: requires air-cooled or water-cooled structure.
**6. Aquaculture**
-Oxygen aerator: aerate the bottom of fish ponds and shrimp ponds to increase dissolved oxygen concentration.
**Advantages: Low pressure (20-40 kPa), stable operation.
**7. Other industries**
-Pneumatic conveying: Pipeline transportation of particles and powders (such as cement and plastic particles).
-Vacuum adsorption: Handling and fixing of electronic components and glass.
-Drying system: Provides hot air circulation for drying equipment.
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**3、 Analysis of Working Principle**
1. * * Volumetric principle * *:
-By rotating two meshing rotors (two or three blades), the gas is "wrapped" from the inlet and pushed to the outlet, without internal compression, and the pressure is determined by the system resistance.
2. * * Flow regulation * *:
-The flow rate can only be adjusted by changing the speed through variable frequency speed regulation (throttling valve adjustment will waste energy).
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**4、 Compared to other fans**
|* * Type * * | * Roots blower * * | * * Centrifugal blower * * | * * Screw blower * *|
|----------------|----------------------------|---------------------------|--------------------------|
|* * Working principle * * | Volumetric | Kinetic | Volumetric (with internal compression)|
|* * Pressure range * * | 0.1~0.8 bar |<0.1 bar | 0.8~10 bar|
|* * Flow characteristics * * | Constant | Varying with pressure | Constant|
|* * Noise * * | Large (requires muffler) | Small | Small|
|* * Applicable scenarios * * | Low pressure stable gas supply | High flow ventilation | High pressure, clean gas delivery|
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**5、 Key parameters for selection**
1. * * Airflow * * (Nm3/min): Calculated according to process requirements, reserve a margin of 10-20.
2. * * Pressure * * (kPa): It needs to cover pipeline resistance+liquid level pressure+equipment pressure loss.
3. * * Medium * *: ordinary air, corrosive gases, flammable gases, etc.
4. * * Special requirements * *: Explosion proof, oil-free, anti-corrosion, low noise, etc.
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**6、 Frequently Asked Questions**
-Why choose Roots blower instead of centrifugal blower**
-When stable flow is required and there is a large fluctuation in system resistance (such as aeration in sewage treatment).
-Can it be used in high-voltage scenarios**
-It is recommended to choose a screw fan or multi-stage centrifugal fan when the pressure exceeds 0.8 bar.
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**Summary**
Roots blower is an ideal equipment for low-pressure constant flow gas transportation, with core values of high reliability and simple maintenance. It is widely used in environmental protection, chemical industry, food, mining and other fields. When selecting, it is necessary to clarify the flow rate, pressure, and medium characteristics, and make requirements for special working conditions (such as corrosion and explosion prevention).
