Study, design and installation

Working for more than thirty years in the field, ASTROFIL Th. N. Akrepi, has worked with almost every kind of industry using bag houses. Our success lays with the excessive care we approach every new project. Both our installed applications and our spare parts have been proven, trustworthy and long living, that being a result of our studying, sharp design and high quality manufacturing.

For every new bag house a sum of parameters must be taken into consideration, making every installation unique and unreliable for using elsewhere. Air velocity, dust concentration and its special characteristics such as its granulometry and composition, corrosive gases or potential explosions set high standards for bag house designing and manufacturing.

Our bag houses can handle inlet flows from 1.000m³/h up to 250.000 m3/h at continuous temperatures of 320oC.

Bag house areas of application

Bag houses are the most common way to contain dust in industry. They are applicable in mines, quarries, cement industry, asphalt plants, textile industry, thermoelectric plants, wood industries, dust chemical industry, foundries, bio-fuel industries, on cement carriers, paired with large burners for boilers etc.

They are also applicable in food industry such as mills, grain silos etc as well as the chemical and pharmaceutical industry where powder materials are used and clean air is crucial. Less suspended particles in the air equals to less chance to contaminate the product with unwanted material.

Bag houses are designed for 24/7 operation with the minimum needs for maintenance and pressured air consumption.

Bag house operation

Crude air, carrying small particles (dust, ash, granulated material) enters bag house at a temperature varying from environmental to 320 oC. It is then guided to a wide area, reducing that way, air velocity. Low air velocity allows an even distribution of the air on the filter bags but more importantly, allows a large portion of the dust particles to settle at the hopper, even before they reach the filter bags.

Filter bags then contain the remaining particles on their surface while allowing clean air to continue traveling towards the clean room and the atmosphere.

Compressed air pulses clean the filter bags from the contained dust, which settles on the hopper as well, and is then removed with the collaboration of a screw conveyor and an airlock.

Every filter bag and its cage are placed on or removed from the perforated plate from the clean side. Perforated plate separates the crude air room from the clean air room. Air tight sealing is achieved with the snap ring every filter bag carries. Distributors guide the compressed air from the valve to each filter bag. Each valve serves up to 10 filter bag and each tank carries up to 6 valves. Pressure measured in Bars is adjusted from pressure controlling valves.

Our jet pulse cleaning system is controlled through an electric panel and every pulse, in terms of time scheduling, is programmed according to the pressure difference between clean and crude air rooms. According to the nature and the concentration of dust, different regulations are applied. That way, we secure minimum compressed air consumption.