Differences between dust extraction systems and cleaning systems

In the context of industrial plants, the management of dust, fumes and residual materials extraction is essential to ensure both the healthiness of the working environment and the cleanliness of production surfaces and spaces.
There are, in fact, two main types of dust extraction systems: those designed to remove fine dust and fumes suspended in the air, and those designed to clean surfaces of deposited dust or heavy chips. These systems, although seemingly similar in general function, have significant technical and operational differences, each optimised for a specific purpose.

• Dust extraction systems for suspended particles and fumes: they focus on air and its purification, with high flow systems for suspended dust.
• Cleaning suction systems: these are designed to extract heavy deposited materials, using pumps with high head but low air flow to generate a strong concentrated suction.

These differences are essential in order to choose the most suitable plant according to the required function. An aspect often debated is the possibility of a single hybrid system, which can perform both functions. Differences in design requirements and operating conditions, however, make this solution complex and, in most cases, inefficient.

Main differences between dust extraction systems and cleaning systems

SUSPENDED DUST AND FUMES EXTRACTION SYSTEM

• Main function: removal of fine dust and suspended fumes in the air.
• Flow rate: high (10,000-30,000 m³/h and above).
• Prevalence: low to medium (between 100 and 500 mmH₂O).
• Extraction method: medium-pressure centrifugal fans.
• Pipes: large diameters for high flow rates.
• Air speed: moderate, to avoid lifting problems.
• Purpose: environmental health in large spaces.

High-flow dust extraction systems

SURFACE CLEANING SYSTEM FROM DUST AND CHIPS

• Main function: suction of dust and chips deposited on surfaces.
• Flow rate: low (up to 2,000 m³/h).
• Prevalence: high (between 1,500 and 2,000 mmH₂O).
• Extraction method: high head pumps.
• Pipes: small diameters for high depressions.
• Air speed: high, for transporting heavier materials.
• Purpose: specific cleaning of surfaces and corners.

High-pressure dust extraction systems

Critical issues in the implementation of a single hybrid extraction system

Fan and pump

Combining high-flow centrifugal fans with high-pressure pumps leads to high energy consumption, as well as difficulties in managing the two systems.

Piping compatibility and air speed

Pipes designed for the high flow rates of fume and light dust extraction systems have large diameters, in order to reduce pressure losses and maintain an adequate air flow. In the case of cleaning systems and extraction systems for heavy materials, on the other hand, the low flow rate and high head lead to a drastic drop in air speed, which in large pipes would cause:

• deposits of dust and aspirated materials;
• potential clogging of the system.

In fume and dust extraction systems, in fact, the pipes installed are large and designed for low depressions, which makes them unsuitable to withstand the high heads required for the extraction of heavy materials. A high-head suction system, therefore, could cause larger and lighter pipes to collapse.

Extraction system efficiency

Making a single extraction system, both for the high air flow rates for dust and fume extraction and the high heads for cleaning operations, is counterproductive for the efficiency of the system itself.

• A single system reduces energy efficiency, because the two extraction modes require very different airflow conditions, and having them coexist in the same system would lead to large energy losses.
• Attempting to create a compromise between the two systems means that neither function works optimally: going from high flow with low head to low flow with high head requires complex control, with significant variations in pressure and speed.

Extraction system maintenance

A combined cleaning dust extraction system would require frequent maintenance in order to prevent deposits in the ducts and clogging in the filters, with high management costs.

Conclusions

Building a single plant for both extraction of suspended dust and cleaning is technically possible, but involves significant compromises in terms of efficiency.
A dust extraction system can also perform the function of a cleaning system, but only partially and with considerable limitations: the heads involved are not equivalent to those of a system designed specifically for cleaning operations. In any case, it would be necessary to consider solutions to limit the deposit of heavy materials inside the pipes.

The optimal solution, therefore, remains to design two separate extraction systems. Contact us for more information or to request a direct consultation with one of our specialists!