Applications
PROBLEMS OF BLAST CABINS AND BLASTERS EXTRACTION PROCESS
We deal with dust extraction at blasting booths and blasters. Dust extraction is an integral part of the blasting, blasting or sandblasting process. Blasting is the technological process of treating the surface of various, usually hard, materials with a stream of pressurized abrasive particles. The most commonly used abrasives for hard materials are steel shot and S-granulated steel, silica sand, corundum, ballast, steel grit, white cast iron grit or slag, or ceramic microspheres.
The reason for blasting the material is to remove impurities from the surface of the blasted product so that the product is ready for subsequent painting. During blasting, rust particles, old paint and other impurities are released into the blasting area. These dust particles are sucked out and separated by a filter system. When blasting aluminium products, aluminium dust may be extracted and form an explosive mixture with the air, and the filter system is therefore equipped for the extraction of explosive dusts.
The filtration system for blasting suction is equipped with a pre-dewatering cyclone for abrasive removal and recovery. The piping connecting the blasting machine, pre-separation chamber and filter unit is of SKIII thick-walled design, as the dust extraction from the blasting machines contains a large amount of abrasive dust particles that penetrate the extraction piping and elbows. We always equip the filter unit with a pre-separation chamber to separate coarse abrasive particles to protect the filter media.
Blast chambers are used for surface blasting of large products such as castings or large weldments. Blast chambers are also used for mechanical shot blasting of large parts such as car frames. A blast chamber is an enclosed blasting area where abrasive particles are blasted against the surface using pressurized air. The blast chamber worker is dressed in a special suit and equipped with a breathing mask. Dust particles and debris from the blasting process are released directly into the blasting chamber. For this reason, we equip the blast booths with an efficient and high-performance air extraction and filtration system. The extraction performance for the blast booths ensures a high air exchange rate of approx. 150 times per hour. When designing the blast booth exhaust, we place the suction slots at the bottom of the chamber and return the filtered air at the top of the chamber. We design the flow inside the blast cabinet in a top-down direction, which results in highly efficient cleaning of the air inside the blast cabinet.
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