For us, understanding your industry is paramount
Filter Bags under the brand name Alimex used in the widest array of sectors. Even the most difficult dedusting tasks can be safely coped with using our high performance filter bags. For we have the appropriate concept for every application. First-rate references are our reward.
Find out more about the versatile possible applications for our filter bags in:
Asphalt mixing plants
Filter media in asphalt mixing plants are exposed to extreme environmental conditions and aggressive corrosive gases. Temperature fluctuations and frequent start- ups and shut-downs with different fuels as well as the resulting potential of sparks put additional strain on the filter media. Dependent upon the operating conditions and dust composition, Alimex offers technically and economically the optimal filter media solution for dedusting your asphalt mixing plant.
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Typical Operating Conditions:
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Cont. Temperature (°C): 100-200°C
Peak Temperature (°C): Orientation to the maximum peak temperature of the fibre polymers used
Dust: Asphalt, minerals
Dust Properties: Abrasive
Dust Source: Dryer, mixer, rotary kiln
Harmful Gases: NOx, SOx
Cleaning Process: Pulse jet, reverse air
Fuels:Bio gas, fuel oil, heavy oil, liquid gas, natural gas, pulverised lignite.
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Specific Requirements for Filter Media in Asphalt Mixing Plants:
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Robust filter media
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Continuous temperature resistance up to 200°C
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Resistant to occasional sparking
Scrim and Fibre Types for Filter Media in Asphalt Mixing Plants
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Alimex Filter media made of 100% Nomex DuPont (NO) fibers with DuPont Label fulfill the requirements of asphalt mixing plants to the highest degree. They are mechanically extremely stable due to the supporting scrim used, the homogeneous fiber layer and the heat setting. This makes them very durable and resistant to harmful effects, even over several operational cycles.
Bio Mass Power Stations
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Due to the ever increasing shortage of fossil fuels, the production of energy from the combustion of bio mass is becoming more and more important. In addition to stalks and herbaceous bio mass (e.g. straw) wood is used as the main fuel in biomass power stations. Compared to fossil fuels such as coal, the composition of bio mass as a fuel may be to a great extent variable. Alimex has specific high-performance filter media for this application, which are precisely matched to the operating conditions of your dust collector.
Typical Operating Conditions:
Cont. Temperature (°C): 100-220°C
Peak Temperature (°C): Orientation to the maximum peak temperature of the fiber polymers used
Dust: Fly ash, sorption products
Dust Properties: Agglomerating, fine, powdery
Dust Source: Cyclone, different sorption processes, grate and fluidized bed firing
Harmful Gases: H2O, HCl, HF, NOx, SOx
Cleaning Process: Pulse jet
Fuels: Bio mass, e.g. olive stones, rapeseed, rice shells, straw, wood
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Specific Requirements for Filter Media in Bio Mass Power Stations:
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High separation efficiency
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Good chemical resistance
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Resistance to high process humidity
Scrim and Fiber Types for Filter Media in Bio mass Power Stations:
Bio mass as a fuel is CO2 neutral, but creates different types of fly ash during combustion, which need to be effectively separated. Therefore high temperature resistant filter media made of Polyphenylene Sulfide (PPS)-, Polyimide (PI)-, Premium Fibre Blend (PFB)- and Polytetrafluoroethylene (PTFE)-fibers are often used in biomass power stations. These filter media types filter fine dust particles efficiently as a result of their increased fibre surface, and under optimal operational conditions maintain lowest possible emission rates.
For highly agglomerating dusts, we recommend the use of filter media with a Glaze-surface finish. An additional CS30® or CS31® finish ensures optimal filtration results.
All filter media models are also available as AlimexMPS filter media. The enlarged filter area of the Alimex MPS filter media ensures highly effective separation of the dusts.
Alimex filter made of needle felt or fiberglass fabric are particularly suitable for fine dust filtration. Owing to a laminated ePTFE membrane, very fine dust particles are already separated on the surface.
Chemical and pharmaceutical industry
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In the chemical and pharmaceutical industry, there are dusts which, due to their high value, are recycled into the production process. On recycling, it must be simultaneously ensured that the products are free of foreign substances and that the strict legal requirements in terms of product purity are maintained. All this demands filter media tailored perfectly to the individual requirements of the dust collector to meet the highest standards in filtration efficiency and product purity.
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Typical Operating Conditions:
Temperature: Cont. (°C) 20°C-250°C
Peak (°C) Orientation to the maximum peak temperature of the fiber polymers used
Dust: Cosmetics, fertilizer, detergents, pharmaceuticals, pigments
Dust Properties: Abrasive, chemically aggressive, explosive, fine, coarse, sticky
Dust Source: Dryer, mills, mixers
Harmful Gases: H2O, NOx, volatile chemical substances
Cleaning Process: Pulse jet
Fuels: Natural gas, oil
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Specific Requirements for Filter Media in the Chemical and Pharmaceutical Industry:
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Discharge of electrostatic charges
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High abrasion resistance
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High separation efficiency
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Good chemical resistance
Scrim and Fiber Types for Filter Media in the Chemical and Pharmaceutical Industry:
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Due to different operating conditions and compositions of the gas streams, almost the complete spectrum of filter media from the low and high temperature range is used in the chemical and pharmaceutical industry. Alimex Filter media stand out for their excellent separation of the often valuable dusts and hence make a positive contribution in increasing the productivity of your production processes.
In order to avoid product contamination due to fiber abrasion of the filter bags, we recommend Alimex Filters made of needle felt or fiberglass fabric. A laminated ePTFE membrane forms a smooth, almost closed surface, which protects against fiber abrasion and reduces product contamination to a minimum when changing products.
In environments in which explosive dust is present, we recommend the use of Excharge filters. They dissipate electrostatic charges safely and achieve resistance values of well below than 106ohms.
Coal-fired power stations
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Coal-fired power stations generate a significant amount of fly ash, which must be safely removed from the flue gas by dust collectors. Therefore, the central task of filter media in coal-fired power stations is an efficient dust removal and the neutralization of harmful gases. Alimex offers you filter media solutions which are designed for these tasks and matched to the individual applications.
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Typical Operating Conditions:
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Cont. Temperature (°C): 70-220°C
Peak Temperature (°C): Orientation to the maximum peak temperature of the fiber polymers used
Dust: Fly ash, sorption products
Dust Properties: Fine, powdery, sometimes abrasive
Dust Source: Dry sorption, fluidized bed firing, pulverized coal firing, scrubber, spray reactor
Harmful Gases: H2O, NOx, SOx
Cleaning Process: Pulse jet
Fuels: Lignite, coal
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Specific Requirements for Filter Media in Coal-Fired Power Stations:
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High abrasion resistance
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High separation performance
Scrim and Fiber Types for Filter Media in Coal-Fired Power Stations:
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Tailor-made Alimex filter made of Polyacrylonitrile homopolymer (DT)-, Polyphenylene Sulfide (PPS)-, Polyimide (PI)-, Premium Fibre Blend (PFB)- and Polytetrafluoroethylene (PTFE)-fibres meet the challenges in coal-fired power stations to the highest degree.
For filtration of the various fly ashes all types are also available as Alimex MPS-filter media. The much larger filter area of the Alimex MPS-filter media ensures that the dust is separated in a highly effective manner.
Thus, under optimal operational conditions, the dust collector achieves emissions which are often far below the legally permissible limits.
For certain operating conditions, Alimex offers a special toplayer construction. In this case, the filter media is complemented with an additional fiber layer of filter active fibers. The separation properties of the filter media can be further increased with an additional CS30 or CS31 finish.
Alimex Filters made of needle felt or fiberglass fabric are particularly suitable for fine dust filtration. Owing to a laminated ePTFE membrane, very fine dust particles are already separated on the surface. Alimex filter media thereby allow compliance with minimal dust emission limit values.
Food Industry:
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Filtration processes in the food industry are characterized by strict hygiene rules and strict requirements regarding static electricity. In order to ensure the highest possible purity of the product during the production and processing of food, hygiene and food-grade quality of all the components involved in the dedusting process, play a decisive role. Alimex filter media used in the food industry are food safe, work under very wet conditions and ensure safe conductivity and discharge of electrostatic charges.
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Typical Operating Conditions:
Cont. Temperature (°C): 20-150°C
Peak Temperature (°C): Orientation to the maximum peak temperature of the fiber polymers used
Dust: Coffee, cocoa, flour dust, powdered milk, sugar, yeast powder
Dust Properties: Abrasive, agglomerating, explosive, fine, sticky
Dust Source: Dryer, mill, packing station, silo, spray reactor
Harmful Gases: ------
Cleaning Process: Clean-in-place, Jet pulse
Fuels: ------
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Specific Requirements for Filter Media in the Food Industry:
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Dissipation of electrostatic charges
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High abrasion resistance
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Suitable for clean-in-place systems
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Food safe
with declaration of conformity according to Regulation (EU) No. 10/2011 Annex IV in conjunction with article 15
Scrim and Fiber Typs for Filter Media in the Food Industry:
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Alimex filter media made of Polypropylene (PP)- or Polyester (PE)-fibres from the low temperature range are mainly used in the food industry. The certified filter media are food safe with declaration of conformity according to Regulation (EU) No. 10/2011 Annex IV, in conjunction with Article 15.
All Alimex types are also available as Alimex Filter media made of needle felt for fine dust filtration. A laminated ePTFE membrane imparts an extremely smooth surface to the filter medium and ensures that the food is protected to the greatest extent against fiber abrasion and discharging the filter cake is facilitated.
In case of electrostatic charges, we recommend an additional ExCharge design. The conductivity of the ExCharge filter media is ensured by high quality stainless steel fibers. An additional Glaze-surface-finish gives the filter media an extremely smooth surface and ensures to a great extent protection against fiber wear through abrasion. Besides this the glaze-finish facilitates the removal of the dust cake from the filter media.
Cement, Gypsum and Lime Industry
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Product quality and compliance with dust emission limits is a core requirement for dedusting in the cement, gypsum and lime industry. The choice of filter media is of paramount importance in cement kilns where there are high NOx levels due to high combustion temperatures. The Alimex filter media range offers for each process in the cement, gypsum and lime industry technically sophisticated solutions.
Typical Operating Conditions:
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Cont. Temperature (°C): 20-250°C
Peak Temperature: (°C): Orientation to the maximum peak temperature of the fibre polymers used
Dust: Cement, clinker, coal, gypsum, lime, raw meal
Dust Properties: Agglomerating, abrasive, explosive
Dust Source: Blast furnace, chlorine bypass, clinker cooler, coal grinding, mill, rotary kiln, spray dryer, silo, transfer stations
Harmful Gases: H2O, NOx, SOx, HCl
Cleaning Process: Pulse jet, reverse air
Fuels: Natural gas, coal, oil, secondary fuels
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Specific Requirements for Filter Media in the Cement, Gypsum and Lime Industry:
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High abrasion resistance
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Discharge of electrostatic charges
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High chemical resistance
Scrim and Fiber Types for Filter Media in the Cement, Gypsum and Lime Industry:
A complete range of filter media is available for the dedusting of the various production processes in the cement industry. The Alimex filter media are characterized by the compact structure and the supporting scrim used. They are thus particularly well suited for the filtration of high dust loads in the cement industry.
For dedusting of cement mills, particularly during addition of grinding aids, our high separating-power Alimex MPS filter media made of fine fibers enhance quality and productivity.
For the dissipation of electric charges in coal grinding, we recommend our ExCharge filter media. These are certified by DEKRA EXAM and safely dissipate electrostatic charges.
Alimex Filter media made of fiberglass fabric with a laminated ePTFE membrane are particularly suitable for fine dust filtration. The ePTFE membrane already retains minute dust particles on the surface, while the glass fiber fabric underneath represents an economical compromise between price and service life.
Steel Production:
In the non-ferrous metal and steel production, the reliable reduction of emissions in a variety of manufacturing processes has become an indispensable process. High air-to-cloths ratios and different harmful gas compositions (e.g. scrap recycling) can damage the filter media and affect the separation efficiency. Alimex filter media have excellent filtration properties and have been successfully used for many years for the dust removal in metallurgical production plants.
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Typical Operating Conditions:
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Cont. Temperature (°C): 40-250°C
Peak Temperature (°C): Orientation to the maximum peak temperatures of the fibre polymers used
Dust: Coke and coal dust, metal oxides, reaction products, sinter dust
Dust Properties: Abrasive, agglomerating, electrostatically charged, fine, pyrophoric
Dust Source: Converters, cupolas, cyclone, drying, dry sorbent, electric arc furnace, foundry, mill, silo, sinter strand, transport station
Harmful Gases: H2O, HCl, NOx, SOx,
Cleaning Process: Pulse jet, reverse air, shaker filter
Fuels: Coal, coke, petcoke, lignite, natural gas
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Specific Requirements for Filter Media in the Non-Ferrous Metal and Steel Production:
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High abrasion resistance
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Resistance to occasional sparks and pyrophoric dusts
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Resistance to hydrolysis after quenching
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Separation of fine dust
Scrim and Fiber Types for Filter Media in the Non-Ferrous Metal and Steel Production:
Alimex Filter media made of Polyacrylonitrile homopolymer (DT)- and Polyester (PE)-, Polyphenylene Sulfide (PPS)-, m-Aramide(NO)- and Polytetrafluoroethylene (PTFE) fibres have proven to be particularly suitable for dust separation in metallurgical production plants. In some instances, Alimex filter media made of Polyimide (PI) and Premium Fiber Blend (PFB) are used.
In the area of steel production, such as in the dedusting of furnaces or the suctioning of arc furnaces, sparks can enter the dust collector. Depending on the dust collector design, filter media are treated with an additional spark-repellent finish. Wherever there are abrasive dusts, such as steel dust or aluminum oxide, an additional Silicone-finish applied to the single fibres can reduce the mechanical stress on the filter media and thus significantly prolong the operational life.
All filter media types for the non-ferrous metal and steel production are also available as Alimex MPS filter media.
Alimex filter media made of needle felt or fiberglass fabric are particularly suitable for fine dust filtration. Owing to a laminated ePTFE membrane, very fine dust particles are already separated on the surface. Alimex filter media thereby allow compliance with minimal dust emission limit values.
Waste treatment plants
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Waste treatment plants impose high demands on dedusting. This concerns not only the thermal and chemical resistance of the filter media, but also the separation performance. The required emission limits can be easily and safely reached with Alimex filter media treated with the appropriate chemical finish
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Typical Operating Conditions:
Cont. Temperature (°C): 100-220°C
Peak Temperature (°C): Orientation to the maximum peak temperature of the fiber polymers used
Dust: Fly ash, sorption products
Dust Properties: Free-lowing to agglomerating
Dust Source: Cyclone, different sorption processes, grate firing
Harmful Gases: H2O, HCl, HF, NOx, SOx
Cleaning Process: Pulse jet
Fuels: Industrial, municipal and hospital waste, sewage sludge
Specific Requirements for Filter Media in Thermal Waste Treatment Plants:
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High temperature resistance
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Good chemical resistance
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High separation performance
Scrim and Fiber Types for Filter Media in Thermal Waste Treatment Plants:
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Because of their high temperature and good chemical resistance, Alimex filter media made of Polyphenylene Sulfide (PPS)-, Polyimide (PI)- , Premium Fiber Blend (PFB)- and Polytetrafluoroethylene (PTFE) fibers are especially suitable in dedusting of thermal waste treatment plants.
In addition, blends of the aforementioned fibers on a chemical and thermal resistant PTFE-scrim have also proven their value for this application. By using PTFE-scrim, the strength of the filter media is maintained over a long period of time, even under challenging operating conditions.
Depending on the flue gas cleaning process, we recommend the Alimex filter media refined with a CS30 or CS31 protective finish. This finish increases the separation efficiency and thereby significantly increases the filtration performance of the filter media.
All filter media models are also available as Alimex MPS filter media. The enlarged filter area of the Alimex MPS filter media ensures highly effective separation of the dusts.
Alimex filter media made of needle felt or fiberglass fabric are particularly suitable for fine dust filtration. Owing to a laminated PTFE membrane, very fine dust particles are already separated on the surface. Alimex filter media thereby allow compliance with minimal dust emission limit values.