Industrial plants in various sectors face the problem of dust generated during ongoing production processes. This dust is generated both during the combustion of fuels in heating plants and combined heat and power plants, during material processing, and during the transfer of bulk products being transported. Nowadays, environmental protection is a very important aspect, and filtering and dedusting devices contribute to this by capturing harmful components from manufacturing processes and not allowing them to enter the atmosphere.
The provision of safe and comfortable working conditions for employees is equally important. Ecoserv has several process solutions and filtering equipment, i.e., vertical and horizontal bag filters, cyclone and multi-cyclone dedusters, which are selected and configured individually for the respective process.
Bag filters are designed for dedusting air, flue, and other gases and removing dry and non-sticky dust. They are used in the cement, lime, foundry, metallurgy, glass, and heat engineering industries to dedust flue gases from power boilers.
BAG FILTERS (WITH VERTICAL BAGS)
Bag filter design
Basic components of the filter:
- Supporting structure
- Chute
- Filtration chamber with the settling channel
- Clean air chamber
- Roof structure (optional)
- Compressed air regeneration system
- Hoppers and bags
- Operating platforms, railings and ladders, stairs
- Filter dust collection system (a screw conveyor with a cell feeder)
- Filter cartridge regeneration control system
Bag filters with vertical filter bags in the filtration chamber. The gas enters the filtration chamber, where the fine dust fractions are captured and remain on the surface of the filter fabric. The dust particles end up at the bottom of the chute funnel, while the cleaned gas enters the outlet chamber and is discharged outside. Pulsed regeneration of the filter with compressed air occurs cyclically (the time between compressed air pulses is set) or automatically (when the differential pressure exceeds the set value in the filter controller). Dedusted flue gases from the filter are extracted by a draft fan to the emitter.
The filter bags are changed from the side of the clean air chamber.
Basic technical parameters:
- dust concentration at the filter inlet up to 500g/m3
- dust concentration at the filter outlet up to 5 mg/m3
- max. operating temperature up to 250°C
- max. filtration velocity 108m3/m2/h
- admissible negative pressure up to 7,000Pa as standard
- max. admissible negative pressure depending on the design 20,000Pa
- recommended flow resistance level 800 Pa to 1,200Pa
BAG FILTERS (WITH HORIZONTAL BAGS)
Bag filters with horizontal bags are installed horizontally in the filtration chamber. The design of the bag filter ensures good bag regeneration and cleaning of the bags from dust, and it eliminates the accumulation of dust on the filter bags and thus their clogging as much as possible. This can have a significant impact on their service life. The bag filter’s regeneration with compressed air occurs cyclically or automatically. Dedusted flue gases from the filter are extracted by a draft fan to the emitter. Horizontal bag filters are designed to dedust flue gases from power station boilers and other contaminated gases. For flue gas dedusting, they ensure the achievement of the required dust emission of less than 30 mg/Nm3 for 6% O2. They are characterised by high compaction of the filter surface in a relatively small space, which allows them to have a compact size.
The filter bags in the horizontal filters have a convenient “snap-ring” fastening implemented, which ensures tightness and ease of assembly. The regeneration of the bags is performed using compressed air.
Compressed air valves integrated into the tank are used for regeneration, significantly improving the valves’ flow conditions and thus better regeneration. Dust concentration at the filter inlet: max. 25g/Nm3.
Filter design:
- Inlet
- Outlet
- Filtration chamber
- Clean chamber
- Filtration bag
- Compressed air tank
- Chute
- Service platform
- Ladder
Cyclone batteries are used for cleaning gases from solid particles (dust). They are made standard from 3 – 4.5 mm thick steel sheets. The inlet head section may have a HARDOX wear-resistant steel insert to extend its life. Cyclone batteries can also be used as pre-dusters, e.g., for bag filters.
Basic technical parameters recommended for the dedusting of grate boilers, (in the case of other applications, the parameters are determined individually, depending on the type of dust and its concentration at the inlet):
- Concentration of dust in inlet gases 6 g/m3
- Concentration of dust in outlet gases 200÷300 mg/m3
- Max. operating temperature 300°C
As a result of centrifugal force (caused by the cylindrical chamber), the flue gases flowing through the cyclones cause the dust to be thrown back onto the wall of the cylindrical shell. Here it slows down under the impact of frictional force, and then falls by gravity before being discharged through a chute tightly closed to the gases with a sluice.
HORIZONTAL PASS-THROUGH MULTI-CYCLONE DEDUSTERS
Pass-through cyclones (multicyclones) are mainly used in the power industry for grate boilers as the preliminary dedusting stage. They are designed to capture the most erosive fractions, which extends the life of cyclone dedusters or filters.
A pass cyclone comprises of cast-iron cyclones (the so-called swirlers), which swirl the flue gases. It is here where the dust is thrown back on the wall of the shell under the impact of centrifugal force, and where it is slowed down under the impact of frictional force, falling into the expansion chamber of the pass-through cyclone. It then falls by gravity to the chute, which is closed with a dust discharge sluice.
Basic technical parameters:
- Applicable diameter of one pass-through cyclone: ø315
Recommended flow rates:
- for the diameter of pass-through cyclone ø315: 1 m 3 /s
The capacity of one pass-through cyclone depends on the number of pass-through cyclones (swirlers) installed and the diameter used.
Electrostatic precipitators are an advanced solution for dust removal. They use an electrostatic field to attract and collect dust particles from the flowing gas stream, thus enabling effective air filtration. It is a standard dust removal method used in commercial power generation, heating engineering, and many other technological processes. It offers state-of-the-art, energy-efficient, and cost-competitive technical solutions which ensure that the guaranteed dust concentration parameters are permanently maintained, energy consumption for own purposes is reduced, whilst guaranteeing high efficiency, maintenance-free operation, and a long service life.
In electrostatic precipitators, the dusty gas is ionised in a strong electrostatic field, so that the collection electrode attracts the dust grains, and then falls into the dust tank. These devices are characterised by high operating efficiency and low flow resistance, even for high gas volumes.
ECOSERV catalogue
We operate in the area of innovative technologies for environmental protection, such as pollutant neutralisation, dedusting, and filtration dedicated to various branches of industry and power generation both in Poland and Europe. Our company is based on state-of-the-art and advanced solutions ensuring the reduction of pollutant emissions following European Union standards. We also have a wide range of equipment and installations for the heat engineering industry.
