Dust Abatement in Industrial Plants and Air Control Criteria
Dust Abatement in Industrial Plants and Air Control Criteria
Cutting, grinding, crushing, mixing and material handling release particles into the air which, without adequate control, spread through the working environment or are conveyed outside.
Dust abatement is the set of techniques that capture and separate suspended particles from the air before they disperse into the environment or are emitted outside. It does not, therefore, end with the installation of a filter downstream of the process: it requires identifying the sources, capturing the pollutants before they disperse and choosing technologies consistent with the characteristics of the particles and the airflow.
In this article we will look at what distinguishes dust from gaseous pollutants, how the main industrial filtration systems work and which parameters guide the design of the plants.
Why dust control matters in industrial plants
Airborne dust affects the health of workers, the safety of operations, product quality and production continuity.
The risk does not depend solely on the quantity of dust present in the air. Chemical composition, size, shape, solubility and aerodynamic characteristics also determine the ability of particles to penetrate the respiratory system.
Some organic or metallic dusts can also form explosive atmospheres in the presence of the necessary conditions and an ignition source.
In terms of workplace safety, Legislative Decree 81/2008 requires the assessment of exposure to chemical agents and the prioritisation of collective protection measures.
When the emission cannot be eliminated, the pollutant must be intercepted as close as possible to the source, through containment and industrial extraction systems: general ventilation remains important, but plays a complementary role to localised capture.
Legislative Decree 152/2006, on the other hand, governs emissions into the atmosphere. In activities that produce, handle, transport or store dusty materials, the operator must adopt containment measures and, where necessary, convey the emissions to a suitable abatement system.
What industrial dusts are and how they are generated
Industrial dusts are solid particles that can remain suspended in the air. They are generated during mechanical operations such as cutting, sanding and grinding, but also in thermal processes, pneumatic transfers and the loading, unloading and storage of bulk products.
Not all of them behave in the same way: particle size, density, humidity, abrasiveness, temperature and the tendency to agglomerate affect how the dust disperses and the technology needed to capture it.
Dust must also be distinguished from gaseous pollutants. The former are particles that can be separated by mechanical forces, filter surfaces, electric fields or liquids. Gases and vapours, on the other hand, are present in the flow at molecular level and require different processes, such as absorption, adsorption, condensation or oxidation.
Industrial filtration and the control of gaseous pollutants
An effective system begins with capture. Hoods, booths, enclosures and localised intakes intercept the pollutant close to the point where it is generated; ducting and fans then convey it to the equipment intended for separation or treatment.
Poorly designed capture cannot be compensated for by installing a more efficient filter: flow rate, air velocity, the position of the intakes and the configuration of the ducting must be considered together.
In industrial filtration, the particulate is retained and collected for disposal or recovery. In the treatment of gaseous pollutants, by contrast, the substance must be transferred, neutralised or transformed.
The correct treatment of industrial air therefore stems from an analysis of the process and may require several consecutive stages.
The main dust abatement technologies
There are numerous technologies for abating dust; among the main ones are:
Cyclones: they use centrifugal forces to separate the particles from the flow. Robust, compact and relatively simple to maintain, they are more effective on coarse dust and are therefore often used as pre-separators.
Bag or cartridge filters (so-called fabric dust collectors): the air passes through a filter medium capable of retaining even fine particles. They offer high performance but require the correct choice of material and effective systems for cleaning the elements and controlling the pressure drop.
Wet scrubbers: they bring the contaminated flow into contact with a liquid and can, in certain configurations, also treat some gaseous pollutants. The management of water and sludge, corrosion and energy consumption must, however, be assessed.
Electrostatic precipitators: they charge the particles and attract them towards collection surfaces. Suitable for high flow rates and fine particulate, they involve greater plant complexity and performance influenced by the properties of the dust.
There is therefore no single technology suitable for every application: the choice depends on concentration, particle size, humidity, temperature, composition, abrasiveness, possible explosiveness and the required emission limits.
From pressure to air: the integrated expertise of Gruppo Baglioni
With the arrival of Aeromeccanica Stranich, we have broadened our expertise in the management of industrial air.
Alongside Gruppo Baglioni’s activities in pressure vessels and air treatment, we now also offer the design of fans, extraction systems, dust abatement systems and solutions for the control of gaseous and dust pollutants.
This integration allows us to address complementary needs within the same production context: the movement and treatment of fluids, industrial ventilation, emission capture and environmental control.
The aim is not to apply a standard solution, but to analyse the process, the operating conditions and the pollutants present in order to identify a configuration consistent with the needs of the plant.
Discover how Aeromeccanica Stranich broadens Gruppo Baglioni’s expertise in industrial ventilation.
Do you need to improve the control of dust and/or air in your industrial plant? Contact us.
