Vacuum Pneumatic Conveying Systems for Industrial Dust
Replace traditional mechanical conveyors with a fully enclosed vacuum system.
- Eliminate dust dispersion
- Prevent cross-contamination
- Ensure maximum containment for your process lines
Vacuum Pneumatic Conveying vs Mechanical Conveying: Advantages for Dust Handling
Traditional mechanical conveyors (screw conveyors, belt conveyors, bucket elevators) are excellent for handling heavy loads, but show critical structural limitations when dealing with chemical, food, or pharmaceutical powders.
Switching to vacuum pneumatic conveying instantly overcomes the limitations of traditional process engineering:
Zero Dust Dispersion (Total Containment): Operating under negative pressure, any micro-leaks in the piping draw air inward. It is physically impossible for toxic or hazardous dust to escape into the factory environment.
Maximum Hygiene with No Risk of Cross-Contamination: As a closed system with no stagnation points, cleaning cycle times (CIP/WIP) are significantly reduced, ensuring safe batch changeovers.
Flexible Routing: Forget the linear constraints of screw conveyors. Pneumatic conveying pipelines can overcome elevation changes, bypass machinery, and be installed in tight spaces.
Minimal Maintenance: The absence of gears, belts, or moving mechanical parts along the conveying line drastically reduces wear and unexpected downtime.
Applications
Pneumatic conveying systems ensure hygiene and quality in the food and pharmaceutical industries, while also improving safety and productivity in the chemical sector and in 3D printing thanks to reduced footprint and dust dispersion.
Food
Pharmaceutical
Additive manufacturing
Chemical
Dilute Phase and Dense Phase Pneumatic Conveying
The core of our expertise lies in accurately sizing the correct velocity and material concentration within the pipeline. Depending on the fragility and abrasiveness of your powder, we engineer the conveying process in two distinct operating regimes.
| Operating Parameter | Dilute Phase Conveying |
| Flow Dynamics | Powder suspended in a continuous airflow. |
| Typical Conveying Speed | High (above 16.5 m/s). |
| Ideal Material | Light, non-fragile and non-abrasive powders (e.g. plastic granules, pellets, tobacco scraps, etc.). |
| Engineering Advantage | Low initial cost, extreme simplicity, and fast discharge. |
| Operating Parameter | Dense Phase Conveying (High Vacuum) |
| Flow Dynamics | Compact powder conveyed in plugs or dunes. |
| Typical Conveying Speed | Low (around 3–5 m/s). |
| Ideal Material | Highly abrasive, fragile powders or mixtures (e.g. pharmaceutical powders, coffee, graphite powder, etc.). |
| Engineering Advantage | Eliminates pipeline wear. Prevents granule breakage. Eliminates segregation (the product does not de-mix). |
In addition, we accurately calculate system pressure losses to provide perfectly sized vacuum pumps: achieving the required flow rate with minimal energy consumption (OpEx).
Design Checklist: What to Consider for a Vacuum System
Designing an efficient vacuum system requires precise engineering analysis. Since conveying relies on negative air pressure, the entire system must be carefully balanced to avoid blockages and energy waste. What needs to be considered to make the right assessments?
1. Material Properties and Density: Bulk density is the primary indicator for vacuum conveying; very heavy or highly cohesive powders (such as titanium dioxide) require dedicated sizing to prevent line blockages. We also assess particle size distribution, moisture content, abrasiveness, and friability to ensure the product is conveyed without alteration.
2. Conveying Distance and Routing: Vacuum systems operate by leveraging a negative pressure differential. To optimize the system, we calculate the total pipeline length, vertical elevation changes, and minimize 90° bends and inclined sections. This reduces aerodynamic resistance and allows the vacuum pump to operate at maximum efficiency. Vacuum conveying is the ideal solution for complex layouts over short to medium distances.
3. Production Throughput: We size the system based on the kg/hour you need to transfer. We don’t rely solely on average production rates, but also account for peak demand (“worst-case scenario”) to ensure your processing equipment always receives sufficient material without bottlenecks.
4. Multiple Pickup Points and Destination: The true strength of vacuum conveying lies in its intake flexibility. It is ideal for extracting dust from multiple sources (e.g. different silos, Big Bag unloading stations, open drums using suction lances) and automatically conveying it to a single final destination, such as a reactor or a mixer.
5. Safety and Containment (Inward Leakage): When handling toxic, explosive, or fibrous materials, vacuum conveying is the preferred technical solution. Operating under negative pressure, in the event of leaks, the system draws ambient air inward, keeping hazardous dust contained within the pipelines and protecting operators.
Once all these parameters have been defined, the decisive step is selecting the fluid dynamic regime in which your powder will be conveyed within the pipeline.
Optimizing Powder Flow to Maximize Efficiency
Unlike liquids or uniform pellets, fine powders exhibit complex fluid dynamic behavior. A standard system may clog, whereas a custom-engineered system prevents the issue at its source.
We analyze bulk density, moisture content, and particle size distribution to prevent the main flow issues, integrating the most effective fluidization systems:
Electrostatic Charges: Friction of powders within the pipelines can cause agglomeration and ignition risk. We integrate dissipative pipelines and antistatic filters to eliminate any charge buildup.
Material Bridging: Cohesive powders tend to compact or form stable arches, blocking discharge outlets. We prevent packing by equipping hoppers and pickup points with vibrating bottoms, fluidization pads, and aerators to ensure a constant and continuous mass flow.
Funnel Flow (Rat-Holing): Some materials flow only through the center of the silo, leaving residue on the walls and causing deterioration of the stagnant product. We optimize intake and discharge geometry to ensure complete “first-in, first-out” (FIFO) flow.
Pneumatic Conveying System Design: The Depureco Method
We do not sell standardized off-the-shelf equipment. We manage the entire system lifecycle to ensure seamless integration into your facility.
1. Analysis and Site Inspection
During the site survey, which allows our engineers to analyze critical points and assess the available space, Depureco also gathers all production requirements. At this stage, our technicians define the applicable regulatory requirements: in addition to pneumatic conveying of the material, they determine whether ATEX filtration or food-grade finishes are required.
2. Custom Design
Every facility has its own layout: our engineers never rely on standard designs, but develop fully customized systems, precisely sized for each application. The integration of filters, pickup points, suction lines, and separators is shared with you and explained in detail. This ensures continuous collaboration and the engineering confidence that every requirement is fully addressed.
3. Installation and Commissioning
Following each phase step by step, Depureco technicians are directly involved through to full system start-up, with the ability to adjust any detail during implementation. After installing the pneumatic conveying system in your facility (chemical, pharmaceutical, or food), we test its performance under load to ensure proper operation.
Test Your Product: Request a Powder Conveying Test
Do not rely on theoretical assumptions for your investment. The rheological behavior of industrial powders requires practical analysis.
Fill out the form to speak with one of our engineers and arrange a conveying test using a real sample of your product.