Air cleaners. Types of filters. Filters for air purification from harmful aerosol emissions in local exhaust ventilation systems of electroplating and pickling industries Filters for air purification after pickling

To remove scale from the surface of the hot strip, etching in sulfuric or hydrochloric acid is used, which can be carried out periodically and continuously.

Periodic etching is used in the preparation of sheets for the application of protective coatings (galvanizing). The carousel-type unit is located in a small separate room, connected with the workshop only by an opening through which sheet cards are fed only from the turntable into an open bath and returned back. Baths are equipped with on-board suction and vapor blow-off (air curtain) to prevent vapors from being knocked out. It is recommended to use high-pressure fans (5-10 kPa) for blowing vapors, which significantly reduces the dimensions of the blower. In this case, the air velocity in the open opening of the room must be at least 1 m/s.

In continuous pickling units, the strip passes through four pickling baths with an alkaline solution and water and hot air drying, after which it is wound into rolls. With suction from one bath of 1200 m 3 /h of air, the entrainment of sulfuric acid with water vapor was 7 kg/h, i.e. about 3% per day. To reduce these secretions, the baths are equipped with double lids and hydraulic seals at the sides. Significantly reduce the evaporation and entrainment of the pickling solution foaming additives.

The total amount of air sucked from the continuous pickling unit is 14000 - 18000 m 3 /h. The average acid content in the air is 2.5 - 2.7 g/m 3 .

Foam devices are used to purify gases from acid vapors, providing a high degree of purification from chemical impurities (95 - 99%). However, even with this degree of purification, the residual content of acids in the air is 0.05 g/m 3 , which is much higher than the sanitary standard.

For washing the air in the foam apparatus, slightly acidified water of the washing bath containing 12–16 g/dm 3 of acid is used. After washing, the acid content in the water rises to 19 - 20 g/dm 3 and the water is sent to the regeneration plant.

At one enterprise, absorption cleaning of gases from baths for pickling stainless steel products with lime milk in high-speed hollow scrubbers is successfully used. The main technical indicators of the installation:

Gas consumption per 1 absorber, thousand m 3 / h t gases, o С 235

t gases, o C 25 - 30

Absorber and droplet eliminator diameter, m 4

Gas velocity in the absorber, m/s 5

Specific irrigation of gas, l / m 3 3.5

System resistance, kPa 3.2 - 3.3

Suspension concentration in solution, g/l 1.5 - 2.0

Degree of absorption of NO x, %< 80

The degree of absorption of fog of acids,% 95 - 98

It cleans 800 thousand m 3 / h per year.

In some cases, to purify gases from etching baths, fibrous filters are used - mist eliminators, the filter material is lavsan, the thickness of the fiber layer is 10 mm.

In installations of small productivity, adsorption cleaning methods are sometimes used. Adsorbers can be synthetic and natural zeolites, activated carbon, silica gels, bentonite clays, etc.

Promising is ion - exchange purification of emissions from pickling baths .

Air preparation module

Duct heater

Module-duct heater (MCH) is a special type of industrial air heater, specially designed for heating industrial premises. It is presented in the form of a metal case made of structural or stainless steel with heating elements, heating elements built into the device. The power level and the number of spirals of the device in each case are selected separately depending on the tasks for heat correction of air. Additionally, the module is equipped with temperature sensors for controlling the heating force and control for the actual temperature of the cleaned air, the PAO (fire emergency shutdown) system, as well as the technological hatch for servicing automatic devices and heating elements.

Dehumidifier

Industrial dehumidifier module (MO) - specialized equipment for regulating the level of air humidity in industrial and commercial premises of large sizes. It has a stainless steel case, equipped with heating coils (heaters), drip cassettes and a tube for draining liquid. electronics). The number and power of heating components is set taking into account the initial data of the cleaned air.

heat exchanger

A heat exchanger module (MTO) is a technical device made of structural painted or stainless steel, equipped with special liquid-cooled duct heaters (heaters). The intensity of work, the dimensions and the number of thermostats used can be different and depend on the specific indicators of the conditioned air. In the lower part of the structure there is a drain drain for collecting and removing condensate formed during the operation of the heater.

The module also includes a set of sensors for energy monitoring and control of cold thermostat heat supply to the duct heater. The latter has the form of a multi-pass tubular metal heat exchanger with non-finned tubes built into it, providing ease of maintenance and cleaning of the device. Before the release and start of operation of the system, each thermostat undergoes a mandatory hydraulic test. That guarantees uninterrupted functioning of the unit during the entire service life.

Air pre-treatment module

Aerosol filter

The aerosol filter (AF) is an air-cleaning device for industrial use. It is used to increase the productivity of local ventilation systems and the efficiency of industrial radioactive aerosol filtration. The module is made of structural or stainless steel, in the form of a body box, inside of which easily removable dispersed cassettes are mounted. To ensure maximum cleaning area, the filter cartridges are mounted horizontally. It is equipped with a cleaner and pollution regulators for dispersed cassettes, which help to anticipate their wear in a timely manner.

Also, the control devices are protected by a special technological door, which, if necessary, provides quick access to the cartridges and the automatic panel. The cassette of the aerosol cleaner itself is metal and contains a special type of filter material. The fiberglass from which it is made has a small static charge, which improves the absorption of gases, and a specific arrangement of the threads of the material, which opens up great opportunities for the container to collect contaminants.

Ion exchange filter

The ion-exchange filter (IOF) is a cleaning device for supply, recirculation and exhaust air in local air conditioning systems under conditions of gas-steam pollution of the environment. Used as the last stage of air cleaning. The unit is produced in the form of a metal case, the surface of which is covered with heavy-duty powder paint. Inside the cleaner there are ion-exchange cassettes and sensors for monitoring their contamination. The filter is sealed and has a protective door.

The cartridges of the device are made of corrosion-resistant material and are located on a special frame, the shape of which is clearly defined in accordance with the configuration of the device and the need to increase its filtration efficiency. The air supply in such a mechanism is comprehensive. The type of filtered material can be selected depending on the optional requirements for the purifier. The method of mounting the device is mainly wall-mounted.

Pocket filter

A pocket filter (KF) is a device for cleaning macrocirculation air of aero-heating, air-conditioning and supply ventilation systems from dust. Used in the last or preliminary stages of air filtration. It is actively in demand in the industrial, food, gas, oil refining, infrastructure and other industries. Acts as an integral element of any type of atmospheric conditioning devices.

The filter consists of stainless metal and mobile compact cassettes sewn like pockets. The fabric of the filter material is 100% synthetic. The pockets themselves have a balanced dynamic design that gives them maximum airflow with minimum resistance. Cassettes are located on a special plastic or aluminum frame. They have a special type of fastening and tailoring, allowing the pockets to maintain their position even under the influence of a strong ventilation flow.

Mesh filter

The mesh filter (SF) is an integral element of the air cleaning system in conditions of high dust content, for household, industrial, agricultural complexes and air conditioning of gas turbine devices. The choice of the class and configuration of the filtration device is always made taking into account the specifics of its production orientation and the level of laminar flow susceptibility. The cleaner is made of high quality stainless steel. The body of the device is equipped with a technological door that hides access to a portable filter kit in the form of mesh cassettes. The regulators of pollution of dust collectors are also located there.

The design of the cartridges is simple and involves multi-layer placement of corrugated woven alloy steel mesh on a galvanized metal frame. On the end sides of the lattice mechanism, to ensure its additional rigidity, two welded matrices are provided. Layers of corrugated mesh are laid according to the principle of mutual intersection. The outer sheets of the cassette are thinner than the inner sheets. The largest grate volume is reached towards the middle of the cartridge. Such a design solution significantly increases the filtration efficiency of the device, while maintaining low aerodynamic resistance.

Electrostatic cassette module

The functional purpose of the electrostatic cassette module (ESC) is the filtration of air contaminated with mechanical and aerosol particles, both domestic and industrial facilities. The purifier has a special design, assembled from an iron body, movable electrostatic cartridges and high-voltage transformers. The device is powered by local electrical distributors. The presence of an emergency indication system in modular transformers determines the safety of maintenance of the cassettes. Only mechanical damage or severe contamination of the electrodes can disable the device.

The material from which modular cartridges are made is an alloy of anti-corrosion aluminum metal and stainless steel. Additionally, high-quality insulation is used. Due to the introduction of aluminum plates into the composition, the device has a small weight. Moreover, the small-sized charging and siege blocks provide the module with compactness and ease of use. At the same time, the catching ability of the mechanism remains at a high level. Thanks to the universal shape and design solution of the cassettes, it is easy and quick to carry out any kind of service maintenance of the device.

Plasma module

Plasma module

The plasma module (MP2) filters air flows by destroying pollution molecules in a low-temperature plasma field, which is formed as a result of a powerful electric charge. The structure of the cleaner is formed from a metal casing, gas-charging units (GRB) and high-voltage transformers. It is the gas-charging units that pass the circulating polluted air through themselves, thereby enhancing the oxidative processes in the structure. The transformer unit is provided with good ventilation, which, in turn, eliminates the possibility of overheating and stopping the device. A multi-stage protection system protects against electric shock when working with the module.

In turn, the gas-discharge unit is equipped with insulated and non-insulated electrodes, which contribute to the occurrence of stable barrier-streamer discharges inside the device when voltage is applied. The materials from which the electrical connection channels are made are selected in such a way that even in the event of an emergency they retain their working life and continue to function after the breakdown has been eliminated. Accurate calculation of plasma parameters, frequency, current power and design of gas-discharge units with maximum energy transfer to ozone conversion of oxygen contributes to minimizing its loss and economic optimization of the module.

Final air purification module

Bulk catalytic filter

The catalytic bulk filter (CNF) is the main type of air cleaning equipment. Most of the filtration processes take place in it - mechanical cleaning, disinfection, detoxification, ozone removal and others. Often the catalytic module is used as a final filtration cleaner. Its design consists of a stainless steel body, built-in transducer cassettes, cartridge contamination sensors and a technical insulating door that provides quick access to the instruments. With small dimensions of the module, the filtration area is maximum.

The catalytic cassette itself is presented in the form of a metal tank with a removable lid, inside which a chemical substance is poured specifically for the decomposition of ozone. The source of the catalyst, as a rule, is highly porous or crystalline oxide-containing materials - aluminum, zinc, iron, platinum, silicon, etc. As a result of catalytic reactions of ozone with compounds of these alloys, negative gas impurities are successfully converted into safe chemical elements, forming active and molecular oxygen . In this simple way, complete air purification from harmful substances is achieved.

Finishing sorption filter

The sorption final filter (SFF) is based on the active use of a chemical and organic sorbent to purify polluted air in a room for various purposes. It has a wide range of aerofiltration. It consists of a metal closed body, dirt-absorbing cassettes, cartridge clogging level meters and a security shield that provides quick access to the dashboard.

The main absorbent element of the module is a special mineralized activated carbon, which is resistant to high levels of humidity in the filtered air. The sorbent is active even when a small concentration of intermediate oxidation products is observed in its layers, bringing the filtration process to exceptional levels. At the same time, the level of ozone density does not exceed the MPC norm.

Areas of use

• Paint and varnish production

  "D8 Potok" reduces the concentration of harmful substances such as white spirit, toluene, ethyl alcohol, xylene, acetone, methyl isobutyl ketone, N-butyl acetate, ethylbenzene, butyl acetate, ethyltoulol, mesitylene, diethylbenzene, benzoic and phthalic acid esters, ethyl acetate, etc.

• Parking lots, garages, engine test benches

  Gas cleaning complexes "D8" will quickly and effectively remove exhaust gases, smoke, products of incomplete combustion and minimize the time of exposure to toxic components of exhaust gases, ensure a high level of human safety.

• Rocket and space complex, aviation industry

  Complexes "D8" are suitable for cleaning exhaust, recirculated air and air of working areas from harmful (toxic) substances and odors to MPE, MPC, as well as to reduce the tonnage of total harmful concentrations up to 98% according to the Customer's Terms of Reference, to solve air purification tasks any volumes.

• Production of fiberglass products

  Modifications "D8 Potok" completely solve the problem of air purification from styrene monomer and solvent vapors both in exhaust air and in recirculation ventilation systems.

• Vodokanal objects (KNS)

  D8 units clean ventilation and process emissions by completely decomposing and oxidizing them with atomic oxygen. Efficiency and reduction of the concentration of pollutants, foul-smelling substances is up to 95%.

• Manufacturing of metal structures

  Complexes "D8 Potok" reduce the concentration of such harmful substances as vat spirit, isopropylbenzene, mezatilene, pseudocumene, xylene, solvent naphtha, methylene diphenyl diisocyanate, vapors of paint components, etc.

• Objects of the Military Construction Complex: shooting ranges, bunkers, bomb shelters

  Purification of air from vapors of mercury and/or lead, compounds of sulfur, antimony, barium, calcium, nitrogen, carbon emitted during shooting at a shooting range. In the bunker, it kills almost 100% harmful, hazardous substances, bacteria, viruses and spores.

• Impregnation of materials

  Purification of air in the working area, purification of exhaust and recirculation air from harmful substances and solvent vapors.

• Research institutes (laboratories), academies of sciences

  Up to 98% purification of the air in the working area and the exhaust air in the ventilation system from fumes and harmful toxic substances generated during laboratory experiments during work on test benches.

• Diesel stations

  Elimination of toxic substances formed in engine cylinders during fuel combustion: carbon monoxide CO, hydrocarbons C m H n , nitrogen oxides NO and NO 2 (NO X).

• Locomotive building and diesel building

  Purification of air in the working area and exhaust air from amine vapors: dimethylethylamine (DMEA), triethylamine (TEA) used when blowing core boxes.

• Offices, business centers

  Ensuring the supply of fresh clean air; removal or filtration of exhaust air; minimum noise level; accessibility in management; small power consumption; small size, the ability to harmoniously fit into the interior.

• Wood processing plants (chipboard, KDP, MDF)

  Comprehensive air purification from phenol, formaldehyde, xylene, toluene, ethanol, benzene, etc. Due to the impact of physico-chemical factors, molecules “break down” into harmless compounds, such as H2O and CO2.

• Laser cutting of wood, plastic and metal

  Removal of particles generated during laser cutting. PVC polymers form HCl; 2-part epoxy resins release amines and PET forms THF (tetrahydrofuran).

• Processing production of fish products

  Eliminates hydrogen sulfide, ammonia, phenols, carbon monoxide, sulfur dioxide, ketones, soot, wood and bone dust, acetic acid esters, monocarboxylic acids, formaldehyde, and more. others

• Production of electromechanical equipment

  Purification of air in the working area and ventilation emissions from solvent vapors: acetone, methyl isobutyl ketone, n-butyl acetate, toluene, xylene, ethylbenzene, ethyl acetate, ethanol, methanol, methoxypropanol, propanol.

• food industry

  Purification of emissions from enterprises from such substances as acetic acid esters, monocarboxylic acids, lactates, formaldehyde, naphthalene, diacetyl, ammonium acetate, ethylbenzene, dimethylbenzene, anthracene, acrolein, butyric acid, phenol, toluene, benzene.

• Printing, flexo printing, lithography

  Purification of air in the working area and ventilation emissions from solvent vapors: acetone, methyl isobutyl ketone; n-butyl acetate; toluene, xylene, ethylbenzene, ethyl acetate; ethanol; methanol; methoxypropanol; propanol.

• Manufacture of artificial leather

  Purification of polluted air emitted to the level of permissible concentrations of such elements as vapors and aerosols of phthalates (phthalate plasticizers), hydrogen chloride, alcohols, aldehydes, carbon monoxide, vinyl chloride, lead, cadmium, etc.

• cable factories

  Gas cleaning equipment eliminates toxic substances released during the manufacture of PVC, such as dioxins, furans and hydrochloric acid.

• Production of RTI (Rubber-Technical Products)

  Up to 98% reduces the concentration in air emissions of substances such as carbon black (soot), sulfur, zinc oxide, phenylnaphthylamine, tetramethylthiuram disulfite (thiuram), a-mercaptobenzothiazole (captax), bisdisulfide (altax), acetone, acetophenol, acrolein, acrylonitrile, dimethylamine , caprolactam, toluene, methanol, benzene, phenol, etc.

• Soap production

  Removal of odors and harmful substances emitted during the operation of soap-making equipment.

• perfume industry

  Ensuring the maximum permissible concentration of alcohol vapors, paper dust in the working area. Elimination of explosive vapors and strong perfume odors.

• Wineries, breweries

  Maintenance of microbial cleanliness in industrial premises. Elimination of excess CO 2 in the fermentation compartment. Providing premises with clean air, without foreign odors.

• Household services (dry cleaners, laundries)

  Purification of air from a mixture of solvent vapors (white spirit, solvent, process gasoline).

In this article, we once again want to focus on how to make the air environment around us better, more favorable and safer. A lot of articles on the topic of creating a favorable microclimate in the premises can dull the attention of an audience whose consciousness is constantly attacked by advertising about air conditioners.

We will be thrifty with readers and talk about those issues that have so far remained aloof from annoying advertising. We are talking about indoor air filtration. Many residents of country houses and cottages may think that this issue does not concern them. After all, the forest air is clean and healthy, in general, not like in the city. This is true, of course, but only in part. Below we will show photographs that can be of interest to this question of any person who wants to calmly and deeply breathe deeply.

If we add to this the problem of smoke in Moscow and the Moscow Region, which once again escalated in the summer of 2010, then the solution of air filtration issues in residential, office and industrial premises to ensure not just comfortable, but the only possible healthy life and activity of our relatives, friends and colleagues will become paramount. After all, it was impossible to hide from the smoke this summer in Moscow and the Moscow region.

So, having finished a short non-lyrical introduction, let's talk about the air that we all breathe.

What kind of air do we breathe

The air environment around us, according to experts, is not favorable for human life, and this is obvious. The reason for this is a large number of vehicles, growing every day. Various industries in Moscow and the Moscow region, and throughout Russia, also do not ozonize the environment.

Harmful substances emitted by building materials, furniture, appliances, the person himself and his pets are mixed with the supply air coming from outside. Our domestic air atmosphere can contain substantial amounts of fumes from household chemicals, various perfumes, cigarette smoke, and, of course, carbon dioxide.

That is, daily tests for our lungs (and, of course, for the brain, which needs fresh air without unnecessary impurities) are not easy. This results in frequent complaints of feeling unwell, headache and even nausea.

Air must be well filtered

We are not leading this story by chance. A person should breathe clean air without unnecessary impurities. The need for this does not need to be explained to anyone for a long time. And the solution to this problem and this task is as follows - the ventilation system must supply clean air, i.e. air must be well filtered. Even in a country house or a cottage.

Thanks to a ventilation system with good filtration, a favorable air atmosphere can be created in your house, cottage, apartment, office or restaurant, in which you can live, work and relax, enduring the blows of Moscow reality, burdened with the smoke of forest fires.

Good ventilation - health without problems

Those. The task of the ventilation system is to improve well-being by reducing the content of impurities in the indoor air, and, if possible, removing sources of pollution. For example, in a well-ventilated room, allergy sufferers can find refuge from harmful allergens. And this task can only be accomplished by cleaning the air supplied to and removed from the premises. An adult human daily consumes approximately 8 kg or 25,000 liters of air. It must be said that this is a very large amount of air and special attention must be paid to its purification.

So how can you purify the air?

By purpose, air purifying devices can be divided into dust collectors and air filters.

Dust collectors are devices designed to remove dust from ventilation air emitted into the atmosphere (the exhaust air must also be cleaned).

Air filters are devices designed to remove dust from supply and recirculation air in supply ventilation systems and air conditioning systems.

According to the principle of operation, air purifying devices can be divided into four main groups:

• gravity dust collectors;
• inertial dust collectors (dry and wet);
• dust collectors and filters of contact action;
• electric dust collectors and filters.

Gravity dust collectors

Gravity dust collectors operate on the principle of using gravitational forces or gravity to cause dust particles to settle out of the air. The device of dust shrink chambers is based on this principle. In these chambers, there is a significant decrease in air velocity, and under the influence of gravitational forces, dust particles settle. A low air flow rate helps to prevent the entrainment of settled dust. This class of equipment is mainly used in industries as the first stage of cleaning.

Schemes of dust shrink chambers: a) the simplest type, b) shelf, c) with suspended rods, d) designs by V. V. Baturin

Inertial dust collectors

Inertial dust collectors (dry and wet) operate on the principle of using inertial forces that arise when the direction of movement of the dusty air flow changes. Such devices include cyclones of various designs, centrifugal scrubbers and washing cyclones, jet dust collectors of the rotoclon type and Venturi dust collectors. According to this principle, the equipment of Vacuflo built-in cleaning systems works.

Dust collectors and contact action filters

Dust traps and contact filters trap dust particles when passing dusty air through dry or wetted porous materials: fabric, a layer of synthetic fibers, paper, wire mesh, layers of granular materials, ceramic and metal rings, etc. Filters of this type are widely used in all areas. More than 70% of all manufactured and used dedusting devices are of this type. All ventilation devices used for public and residential buildings are equipped with such filters.

Electric dust collectors and filters

Electric dust collectors and filters purify the air from particles suspended in it (dust, fog and smoke) by ionizing them when passing through an electric field. Filters of this type are also called photocatalytic. In the photocatalytic purification unit, the process of photocatalysis takes place and all gas-phase air pollutants (unpleasant odors, toxic gases, allergens, etc.) are adsorbed on the surface of the photocatalyst and decomposed under the action of ultraviolet radiation to harmless components (to carbon dioxide and water). During operation, contaminants do not accumulate on the filter, but are completely decomposed. Filters of this type for public and residential buildings are used for special requirements for the localization of various odors, tobacco smoke and other volatile substances.

The use of filters of this type in ventilation systems can reduce the amount of smoke inside the premises.

! Note to the reader
At one of the facilities in the Moscow region, our service engineers installed a photocatalytic filter for Swegon GOLD.

Dust classification

For a competent choice of an air purification device, it is necessary to take into account the particle size distribution of dust.

The last three groups are very life-threatening, as they are not excreted from the human lungs.

Filter classification

The classification of devices that purify the air according to their efficiency is made as a percentage of the concentration of dust particles before and after the filter.

In private construction, coarse and fine filters are used. High-purity and ultra-efficient filters are used in factories, laboratories, clean rooms and medical institutions.

But taking into account the granulometric composition of dust, the choice of purification efficiency and the type of filters, the task of air purification does not end.

One of the parameters of any filter is its dust capacity (g / m²) - this is the amount of dust that the filter can catch per 1 m² of its surface, and after that the filter must be replaced or its trapping capacity regenerated. This parameter is the main parameter in determining the maintenance schedule for the filtration system.

Filter maintenance and replacement intervals

The frequency of maintenance and replacement of air purifying devices can be seen in the table below.

But you need to remember that the following factors can affect the frequency of replacing and cleaning filters:

• in the summer period of the year, when poplar blossoms, there is a lot of poplar fluff in the surrounding atmosphere;
• when an object is located near a forest or a reservoir, a lot of various pollen, leaves, insects, etc. flies in the air.

Our experience has shown that installed filters of class F7 and F5 provide the best air purification, but they are "clogged" with large particles ahead of the calculated time. We recommend that any ventilation system be equipped with additional coarse filters of class G3. This additional filter will reduce the frequency of replacing the main (expensive), and cleaning the coarse filter itself does not require a significant investment of time and money.

In the photo below you can see a coarse filter, which was installed in the ventilation system of a country house in the Moscow region. As you can see in the photo, country air also needs good filtration.

The filter is wrapped in a dense coat of particles and insects in the forest air

Installing a coarse filter will also reduce the aerodynamic pressure loss of ventilation equipment, which will reduce energy consumption (since the electric motors of the ventilation unit will operate at lower speeds) and increase the “life cycle” of all moving parts of the ventilation system.

During the smoky air in the capital, we suggest replacing the usual filter in the ventilation system with a carbon one.

As a result, you can significantly improve the air atmosphere in your country house, cottage, apartment or office.

Purification of compressed air is a necessary measure to remove solid particles and oil from it. When fed into a compressor, normal air contains about 1.8 billion dust particles. In addition to dust, emulsions and oil vapors can enter the compressed air after compressor operation, which also pollute it. As a result, there is a need to clean it up. Compressed air is cleaned using a system of filters that are installed in a pneumatic system or line, hence the name of such filters - main lines.

Selection of compressed air filters

1. Preliminary (coarse) filter.
2. Main filter.
3. Fine filter.
4. Microfilter.
5. Filter that removes vapors and odors.

Preliminary (coarse) filter seriesD.F.- retains solid particles up to 10 microns, which refers such compressed air to class 7 according to ISO8573-1. Such a filter is also called a pre-filter. It is installed after the receiver, before the refrigeration dryer and is designed to protect the equipment from fairly large solid particles and oil droplets contained in the compressed air. It adopts ceramic filter element, which has good moisture resistance.

Main filter seriesQF, in principle, solves the same problem as the coarse filter, however, it is able to retain solid particles already up to 5 microns, which refers it to the 3rd class of air purification according to ISO8573-1. It is installed after the pre-filter. It has excellent filtering ability at elevated temperatures - up to 90 C)

PF series fine filter- detains particles over 1 micron, including drops of oil. This filter, using impact, entrapment and coalescing mechanisms, causes submicron sized liquid particles passing through the filter cartridge from the inside to collide and form larger particles, which are then trapped and accumulated at the bottom of the filter housing. The maximum residual oil content at the filter outlet is 0.1 mg/m3. Typically installed at the outlet of a refrigeration dryer and used to prevent pipeline corrosion and as a prefilter before a microfilter. According to ISO8573-1, the filter provides class 2 cleanliness for particulate matter and class 2 for oil content.

HF series microfilter allows you to retain the remains of microparticles and oils larger than 0.01 microns. The maximum residual oil content at the outlet of the filter does not exceed 0.01 mg/m3. Such a filter is used for protection in pneumatic transport, when painting, as well as for protecting pneumatic control systems. The filter cartridge has internal and external structures made of perforated steel. The outer casing is made of PVC, withstands air temperatures up to 120 °C and ensures the removal of accumulated liquid to the bottom of the flask. This filter provides Class 1 cleanliness for solids and oil content.

Vapor and odor filter CF series contains activated carbon, which adsorbs odors and oil vapors, such a filter allows 100% air purification. The maximum residual oil content at the outlet of the filter is 0.003 mg/m3, which provides class 1 air purity, which can be used in the food, chemical, dentistry and pharmaceutical industries.

In order to obtain high air quality and extend the service life of cartridges - replaceable filter elements, it is recommended to install main filters in series.

Features of the use of cartridges.

You can evaluate the efficiency of the filter using differential pressure - this is the difference between the pressure at the inlet to the filter and the pressure at the outlet of it. Differential pressure helps to determine the degree of contamination of the cartridge (replaceable element), since the differential pressure shows the degree of resistance of the filter to the air flow. The higher the differential pressure, the more contaminated the filter element. You can determine the value of the differential pressure using a special (differential) pressure gauge, which is installed on the filter.

It should be noted that a pressure drop can occur even when a new filter is installed. In this case, the pressure may drop from 0.05 to 0.2 bar. Over time, the filter cartridge becomes dirty, which means that the size of the differential pressure increases. It is generally accepted that the replacement of a replaceable filter is carried out if the degree of contamination of the filter "passes the red zone" - the scale is colored red on the filter pressure gauge. In this case, the differential pressure typically exceeds 0.5 bar
Of course, this cartridge can be used further, however, in this case, a lot of electricity will be wasted, since the filter's throughput will drop sharply due to contamination.

Along with the differential pressure gauge, there are also special devices - indicators that show the level of filter contamination by color.

However, the speed and degree of contamination of the cartridge is directly proportional to the level of intensity of use of the filter.

In addition, the removal of condensate from the filter is of great importance, which must be carried out in a timely manner in order to avoid excessive contamination of the filter element. In this regard, main filters can be of two types:

Filters with manual drain valve condensate.

Such filters are, as a rule, standard and condensate is drained in "manual mode".

Filters with automatic valve condensate drain.

Filters with "automatic" allow you not to monitor the level of condensate every time, since it is drained automatically. The difference in the solution is reflected in the price, since you will have to pay extra for the "automatic".

Another solution that is often necessary is to have a mount for the main filters, since their weight seems to be significant.

Replaceable elements of the main filters, depending on the intensity of operation, with the proper level of service, can be replaced 1-2 times a year. In any case, to ensure maximum efficiency in operation, it is recommended to replace the filter cartridge every 3-4 thousand working hours.