Roots Blowers for Pneumatic Conveying

Roots blowers are commonly used as air sources for pneumatic conveying systems, providing continuous airflow for pressure or vacuum conveying applications. The appropriate blower should be selected according to the required airflow, operating pressure or vacuum, conveying distance, pipeline conditions and material being     conveyed.

    What Is Pneumatic Conveying?

        Pneumatic conveying is a method of transporting dry bulk materials such as powders, pellets, grains and granules through an enclosed pipeline using a controlled flow of air or gas. The material can be transported by positive pressure or vacuum, depending on the conveying system and application.

        A pneumatic conveying system typically includes an air source, material feeding equipment, conveying pipeline and separation or filtration equipment. Different system configurations can be selected according to the material being conveyed and the required conveying conditions.

Positive Pressure vs. Vacuum Conveying

        Pneumatic conveying systems can operate using positive pressure or vacuum. In a positive-pressure conveying system, the blower supplies air at the beginning of the conveying line to push the material through the pipeline. In a vacuum conveying system, the air source creates negative pressure to draw material toward the receiving point.

        Roots blowers can be used for both pressure and vacuum conveying applications, depending on the required operating conditions. The choice b

etween pressure and vacuum conveying depends on factors such as material characteristics, conveying distance, system layout, feeding and discharge requirements, and the required airflow and pressure or vacuum level. 

Dilute Phase vs. Dense Phase Conveying

        Pneumatic conveying can generally be classified into dilute-phase and dense-phase conveying. In dilute-phase conveying, material is suspended in a relatively high-velocity airstream and is commonly used for free-flowing powders, pellets and other bulk materials. Dense-phase conveying uses lower air velocity and higher pressure to move material in plugs or slugs, making it suitable for certain fragile, abrasive or cohesive materials.

        The conveying phase affects the required airflow, pressure, conveying velocity and blower selection. Roots blowers are commonly used in dilute-phase conveying and can also be considered for certain higher-pressure conveying applications when the required operating conditions are within the blower's performance range.

How to Select a Roots Blower for Pneumatic Conveying?

        Selecting a Roots blower for pneumatic conveying starts with determining the required airflow and operating pressure or vacuum. The required airflow depends on factors such as material type, conveying capacity, conveying velocity and pipeline diameter, while the pressure or vacuum requirement is affected by conveying distance, pipeline resistance, elevation changes, bends and other system components.

        Material characteristics and conveying method should also be considered. Particle size, density, moisture content, abrasiveness and other properties can affect the required conveying conditions. Positive-pressure, vacuum, dilute-phase and dense-phase systems may have different airflow and pressure requirements.

        For a preliminary Roots blower selection, provide the material being conveyed, conveying capacity, pipeline diameter and length, vertical elevation, number of bends, required conveying pressure or vacuum, and operating conditions. Zhaner can recommend a suitable Roots blower based on the required airflow and pressure or vacuum.

Roots Blowers for Biogas & Gas Handling

        Biogas and other process gases require controlled gas handling for applications such as gas transfer, pressure boosting, gas recovery and delivery to downstream equipment. The required blower performance depends on factors such as gas composition, flow rate, operating pressure or vacuum, temperature and system conditions.

        Roots blowers can provide continuous and stable airflow for low-pressure gas handling applications. The appropriate blower configuration should be selected according to the gas characteristics and operating requirements, including the required flow, pressure or vacuum, sealing and material compatibility.

Where Are Blowers Used in Biogas Systems?

        Blowers can be used in different stages of biogas and gas handling systems, including biogas transfer, gas boosting, anaerobic digestion and landfill gas collection. The specific blower requirements depend on the gas flow, operating pressure or vacuum, gas composition and system configuration.

        In anaerobic digestion systems, blowers may be used for gas transfer or other low-pressure gas handling applications. In landfill gas systems, blowers can be used to create vacuum and move collected gas toward downstream treatment, flaring or energy recovery equipment. For biogas transfer and boosting, the blower should be selected according to the required flow, pressure and gas-handling conditions.

How to Select a Blower for Biogas?

        Selecting a blower for biogas starts with determining the required gas flow and operating pressure or vacuum. The blower selection should also consider the biogas composition, including methane, carbon dioxide, hydrogen sulfide and moisture, as well as gas temperature and operating conditions.

        Sealing and material compatibility are important considerations when handling biogas. Depending on the gas characteristics and application requirements, the blower may require suitable sealing, corrosion-resistant materials and an appropriate motor configuration.

        For a preliminary blower selection, provide the gas composition, required gas flow, operating pressure or vacuum, gas temperature, operating hours and system conditions. Zhaner can recommend a suitable Roots blower configuration based on the specific gas-handling requirements.