Dust collecting installations pfts. Dust Collectors Dry Mechanical Separators

Ventilation dust collectors UVP (Individual chip extractors UVP-IN series) are designed to remove and clean air from shavings and sawdust and collect waste in storage bags. Chip extractors are designed for use in small businesses with low waste generation. The air purification degree of the units is 99.9%. The units are used to remove contaminated air from individual machines or groups of machines and have a capacity of up to 7000 m 3 / hour by air. Due to the design peculiarities, the distance from the machine to the chip suction, as a rule, should not exceed 2 m. The unit consists of a housing with a built-in dust fan; filters and waste accumulators are attached to the housing using easily removable clamps.

CHARACTERISTICS OF UVP CHIP PUMPS:

Productivity, m 3 / hour
Air flow speed at the inlet, not less than m / s.
Created vacuum, Pa
Air purification degree,%
Number and diameter of air ducts, pcs / mm
Number and total volume of drives, pcs / m 3
Unit overall dimensions, mm (length x width x height)					2450x1050x2500	З090х1050х2540
Weight, no more, kg
Electric power / motor, kW

Execution options.

• For air purification from sawdust, shavings, chipboard sawdust, plastics, etc.
• To clean the air from sawdust, dust generated as a result of processing on milling machines MDF and similar materials with increased filtration area.
  When using installations of the IN series for air purification from shavings, sawdust, dust formed as a result of processing MDF, chipboard, fiberboard and other materials, in which the proportion of light fine fraction in the waste composition is relatively high, it is recommended to use filters with an increased filtering area. The increase in area is necessary to reduce the gas and dust load on the filter material. This prevents deep penetration of dust particles into the material and increases the filter life. The units are designed for indoor use.

Dust collector model	Performance, m 3 / h	Installed capacity of electric motors, with frequency regulator, kW	Dust collector volume, m 3	amount suctions up to, pcs.	The weight, kg
Dust collection unit PFC-1250	1250	1,1	0,3	1-2	83
Dust collecting unit PFC-1500	1500	1,5	0,3	1-3	86
Dust collection unit PFC-2000	2000	2,2	0,3	1-4	91
Dust collection unit PFC-3000	3000	4	2x0.3	1-4	153
Dust collecting unit PFC-4000	4000	5,5	2x0.3	1-4	163
Dust collecting unit PFC-5000	5000	7,5	2x0.3	1-4	177
Dust collecting unit PFC-8000	8000	11/15	2x0.9	1-4	366

Overall dimensions of PFC dust collection units

Model	H	H *	h	d	A	B	c
Dust collection unit PFC-1250	2430	2580	1305	140	1300	890	255
Dust collecting unit PFC-1500	2450	2600	1305	160	1300	890	255
Dust collection unit PFC-2000	2500	2650	1310	180	1300	890	255
Dust collection unit PFC-3000	2460	2610	1260	225	1980	835	-
Dust collecting unit PFC-4000	2520	2670	1260	250	1980	835	-
Dust collecting unit PFC-5000	2580	2730	1260	280	1980	835	-
Dust collecting unit PFC-8000	2970	3120	2190	355	2470	1060	-

Payment Methods:

• Cashless payments for legal entities with VAT.

Delivery in Moscow and Moscow region:

• Transport company Business lines or PEC, others by agreement.
• Goods "in stock" can be picked up from the warehouse on the day of receipt money to our bank account.
• Delivery is carried out within 1-2 working days from the moment your order is ready.

Delivery across Russia:

• Transport company (TC) Business lines or PEC, others by agreement. Delivery to the TK terminal is FREE. (3 times a week).
• Shipping cost of TC depends on the region. Our managers will calculate all the options and offer the most convenient and profitable delivery method for you.
• With our vehicles in the shortest possible time. Shipping cost is calculated based on the volume and weight of the cargo.

Warranty

• Our company sells exclusively new goods, which are covered by a factory warranty from 12 months to 36 months.

Dust collection units PFC are designed for fine air purification inside small and medium-sized industrial and agricultural premises. They can be used to clean the air from wood dust and suspended shavings in the workshops of the woodworking industry. The highest dustiness of the working environment is 15/5 g / m3. (in the ratio of large suspended fractions / dust).

The minimum air purity at the outlet of the PFC dust collector is 0.5 mg / m3.

Design features

Dust collecting units PFC have a mobile design, are produced in the form of a monoblock, and are delivered to the customer assembled in the manufacturer's packaging.

The main units of the PFC series dust collection unit include the following structural elements:

The body is a load-bearing steel element of a welded structure, on which other units and parts of the equipment are located A cyclone element is located in the body, in which the primary gravitational air cleaning from large suspended particles is carried out (the first stage of cleaning). In the cyclone, the air swirls, due to which the particles under the action of centrifugal force are pressed against the walls of the cyclone and settle in the dust collector.

In the lower part of the case there is a dust-collecting bag, which can be removed as it is filled to clean and dispose of collected dust and debris. In the upper part of the body there is a cassette filter made of filter paper of class F9, where fine additional purification of air (the second stage of cleaning) takes place. In comparison with the filter sleeve (as, for example, in the PUA-M chip suction dust collectors), the cassette paper filter provides finer cleaning and has a longer resource.

In the basic version, together with the cassette, the unit is equipped with a manual regeneration system inner surface, but at the request of the customer it is possible to retrofit the PFC dust collector with an automatic regeneration system.

The purified air is discharged directly into the room atmosphere. The air is forced to move due to the operation of a low-noise dust fan installed on the case. An asynchronous electric motor is used as a drive. The fan inlet pipe has a circular cross-section and is directed downward (it is possible to connect an air sleeve or a non-extended duct).

Manufacturing options

The standard-size range of PFC dust installations includes 7 standard models.

Installations for dust and shavings PFC-1250, PFC-1500 and PFC-2000 are produced in single versions. The rest of the models of the PFC dust-collecting units are made in a group version (two cassettes and two dust collectors).

The selection of the required model is carried out according to the nominal capacity, taking into account the actual operating conditions.

Operating conditions

Dust collecting units PFC are to be operated indoors under U2 conditions in accordance with GOST 15150.

If you do not take special measures to remove mechanical waste and dusty air from working area a woodworking machine, the surrounding space soon after the start of work becomes unsuitable for a person not equipped with personal protective equipment, and extremely fire hazardous. Dust collecting (aspiration) installations are aimed at cleaning the atmosphere of the industrial premises, making the work of the personnel comfortable and safe.

APPLICATION AREA

Autonomous dust-collecting (aspiration) devices are used in production facilities, which are impossible or impractical to equip with a centralized air purification and waste disposal system. Such installations are mainly used in areas for the processing of wood and similar materials of small enterprises in the furniture, construction and other industries.

CONSTRUCTION FEATURES

Structurally, the scheme of cleaning a mixture of air with shavings and sawdust removed from the zone mechanical processing by means of an exhaust fan that creates a vacuum, it is filtered by passing it through a layer of fabric from which the receiving container is made. The solid component of the mixture separated by the filter is deposited in the lower part of the device, which serves as a waste accumulator.

A high degree of air purification, reaching 99.9%, frees workers from the need to use personal protective devices (respirators, etc.) and reduces the level fire hazard to the standard level.

The design of most modern woodworking machines provides the ability to connect them to a workshop aspiration system or to a dust collection unit.

Dust collecting devices are completed with one or several filtering units, consisting of fabric bags located one above the other: filter and storage. Depending on the volume of waste generated by the equipment, you can select an installation of appropriate capacity. As a rule, several emission sources can be connected to one unit.

Many models of dust collection units can be used in vacuum cleaning mode when cleaning industrial premises.

MAIN ADVANTAGES

Dust collecting installations have become an indispensable element in the organization of woodworking production. Without such devices, it is impossible to fulfill the requirements for working conditions established by sanitary standards and ensure compliance with fire safety standards.

In the process of manufacturing various furniture products, a significant amount of fine dust and particles of the original blanks is produced. Such dust not only worsens the working conditions of production personnel, but also contributes to possible failures of moving equipment parts. That is why in the mass processes of woodworking, the presence of dust collecting installations is provided.

Principle of operation and device

The systems under consideration perform the function of collecting and removing dust and small industrial waste, which contains unsafe components such as resins, alkaloids, toxic organic and inorganic particles. When inhaled as dust, they can cause a wide range of allergic reactions, skin problems and respiratory problems. Often used in woodworking, plywood, MDF and chipboard are especially problematic due to the adhesive resins required to make them. The sequence of operation of modern dust-collecting ventilation units consists of the following stages:

1. Capturing dust at its source.
2. Extraction of small wood particles with suction fans.
3. Filtration by fractions.
4. Removal in special dust collectors.

   To accomplish the set tasks, the dust collection unit includes a duct system, a set of coarse and fine filters, supply and exhaust fans, containers for waste collection. The corresponding areas are necessarily provided for in the design of production sites, and the balance of energy costs includes the consumption of electricity to drive the moving parts of the equipment under consideration.

   In order to reduce the noise level, the installation of motors and prefabricated units is usually carried out outside the production area. At the same time, it simplifies access for cleaning and maintenance of all components of dust extraction ventilation units.

   How the operating parameters are selected

   The initial indicators for the selection of the standard size and capacity of the dust collection unit are:

   • Air volume (in m3 / min) to be moved / removed;
   • Maximum possible dust concentration (MPC) in the room;
   • The complexity of the duct system.

To remove finely dispersed wood dust in the branches for adequate extraction of dust into the main duct, a capacity of at least 110 ... 130 m3 / min is usually required. Depending on how many pieces of production equipment are connected to the system and how long the ducting is, one or more ventilation units may be required.

In accordance with the hygiene standards established by Rospotrebnadzor (GN 2.1.6.1125-2002), the MPC for dust in woodworking areas is 0.5 mg / m3, while the MPC for harmful components should not exceed 30% of the specified norm. Correct installation and grounding of the collection system (and especially ductwork) is important to prevent the accumulation of static electricity and developing levels of negative pressure delivered by ventilation air.

Brief description of the components of the dust collection system

The choice of the type, number and performance of filters is decisive. Modern filtration units contain washable pre-filters. They capture dust particles as small as 3 microns (smaller particles are captured by smoke filters).

There is a disposable bag inside the filtration unit, the dimensions of which depend on the unit performance. In woodworking industries, it is recommended to install combined filters that allow you to purify the air both in the area of \u200b\u200bthe machine and in the general room.

Some of the dust extraction ventilation units are supplied with local work lighting, making them good choice for installation directly at the technological equipment. Preference is given to equipment that comes with a remote control.

The main requirement for a ventilation unit is the ability to trap toxic aerosols, fog, gases, vapors, smoke and dust while effectively filtering the air entering the air ducts.

The MDM-TECHNO company offers services of design, delivery, installation supervision and field supervision over the operation of dust collection plants. Upon conclusion of the contract qualified specialists companies will fulfill technical justification of the project, they will select the appropriate equipment, install and connect it with high quality. Customers are provided with a quality certificate. Post-warranty service of equipment is possible.

Centrifugal dust collectors

The centrifugal dust collector is the most common type of mechanical dust collector used in food, chemical, mining and many other industries. The main advantage of such dust collectors is their low cost, high productivity, simple mechanism, as well as fairly simple and inexpensive operation. Compared to other types of centrifugal dust collectors, they have such advantages as reliable operation at high temperatures and pressures, no parts that move, ease of repair and manufacture, and the ability to use to capture abrasive particles.

Centrifugal dust collectors use centrifugal force to trap dust. The most popular centrifugal dust collectors are wet film cyclones. In such devices, the deposition of particles occurs using the action of a centrifugal and inert mechanism. Consequently, the efficiency of such devices is much higher than that of cyclones, because due to the presence of a wet film, no secondary entrainment of dust occurs. In addition, such devices are more efficient than scrubbers due to the fact that the speed of droplets and gas flow in them is much higher due to centrifugal force.

In wet cyclones, liquid is supplied along the inner walls of the apparatus and into its axial zone.

The most efficient wet dust collector is the Venturi scrubber, which is a high-speed device. Such installations can be divided according to the area of \u200b\u200buse into:

• Low-pressure, used for concentration and purification of aspiration air. The hydraulic resistance of such devices is in the range from 3000 to 500 Pa.
• High-pressure apparatuses are used to purify gases from submicron and micron dust. Their resistance reaches 20,000-30,000 Pa.

The operation of such devices is based on a high-velocity gas flow, which intensively breaks up the liquid that irrigates it. And due to the turbulence of the gas flow, as well as the rather large difference between the velocity of liquid droplets and particles, dust particles are deposited on the liquid droplets that irrigate it.

In order to reduce hydraulic resistance, the main part of the scrubber is made in the form of a Venturi tube, which gradually narrows at the inlet of gases and expands at their outlet. The gas inlet and outlet are connected by means of a nozzle.

For the stable operation of the apparatus, it is very important that there is complete and uniform irrigation of the liquid throat section. That is why the choice of the irrigation method is very important and affects the design of the apparatus.

There are three most commonly used throat irrigation methods:

1. Peripheral. With this method of irrigation, nozzles or nozzles are mounted along the perimeter of the neck or confuser.
2. Central. The sprinkling liquid enters the throat from the nozzles that are installed in the confuser or in front of it.
3. Film. It is used most often to prevent the formation of deposits on the walls.

To calculate the hydraulic resistance, the expression is used:

Δp \u003d Δp g + Δp l

In which Δp g is the hydraulic resistance of a dry pipe, which is due to the movement of gas:

Δp g \u003d (ξ c ν g ² ρ g) / 2

Where ξ c is the coefficient of hydraulic resistance of a dry pipe,
and ν g is the velocity of the gases in the throat.

The efficiency of dust collection depends most of all on the specific irrigation and gas velocity. The optimal ratio of dust flow rate and specific irrigation primarily depends on the dispersed composition of the dust. In this case, the specific amount of irrigation is in the range of 0.5-1.5 l / m 3 gases.

In addition, the efficiency of dust collection depends on the dispersion of the sprayed liquid droplets. Moreover, the smaller the drops, the better the gas is purified.

To determine the average droplet diameter, an empirical formula is used:

d k \u003d 4870 / ν² + 28.18 m 1.5

Centrifugal dust collectors (cyclones) received active use in industry. Contaminated gas enters the cyclone body at a speed of 20 to 25 m / s. The gas flow moves tangentially, resulting in a rotational motion. Dust particles are thrown back by centrifugal force and fall into the extreme layers of contaminated gas, which spiral downward along the walls of the cyclone. Suspended dust particles are removed from the unit through a special exhaust pipe. The mixture of gas and dust rotates and rises upward, resulting in a vortex. This vortex moves along the axis of the installation towards the exhaust pipe and captures with it a part of the gas moving downward from the inner layers. This gas layer is characterized by a low content of dust particles. It moves along the tapered part of the body to the lower edge of the exhaust pipe. Upon reaching the lower edge of the exhaust pipe, the flow turns towards the cyclone axis.

Vortex dust collectors. Specifications

Vortex dust collectors are increasingly used in industry. Such an apparatus resembles a cyclone, but its feature is the presence of an additional swirling gas flow in it. The world produces different models such dust collectors with a capacity of 300-40,000 m 3 / hour. The capacity of the vortex dust collectors increases with decreasing diameter.

In vortex dust collectors atmospheric air, dusty gases, as well as the peripheral part of the pure gas stream are used as secondary gas.

If we compare vortex dust collectors with counter-current cyclones, then the former have such advantages as working with gases high temperature, good degree of purification, regulation of the process of gas purification from dust by adjusting the secondary air flow. Among the disadvantages of vortex dust collectors should be highlighted high hydraulic resistance, the need for a powerful draft device, as well as complex operation and installation.

d cr \u003d √ (ν² / H) · (18μ g · ln) / ([ρ h -ρ z] · ω²)

in which H - is the high working area,
D tr - the diameter of the conducting pipe,
D 1 is the diameter of the device itself,
ω is the angular velocity of the gas being cleaned.

Vortex Dust Collector

The design of the vortex dust collector can be seen in the figure. In such an apparatus, the untreated gas flow enters the apparatus through the nozzles, swirls, and then enters the working area of \u200b\u200bthe vortex dust collector. Under the influence of centrifugal force, dust particles from the gas are directed to the walls of the apparatus. And under the influence of gravity, they go down. After that, they go to a special bunker. In this case, the purified air flows through the exhaust pipe.

The efficiency of such a dust collector depends on the ratio of the amount of the upper Q 2 and lower Q 1 gas flow. For the vortex dust collector to operate at its maximum efficiency, Q 2 / Q 1 must be between 1.5 and 2.2.

1. Determination of the diameter of the working area. For this, in the calculations, the speed of the dusty flow is taken as ν g \u003d 5-10 (m / s):

D 1 \u003d √4 G / Π ν г

1. Determination of the dimensions of the dust collector depending on its diameter.
2. Calculation of the hydraulic resistance of the vortex dust collector according to the formula:

Δp \u003d (ξ · ρ · ν g ²) / 2

in which ξ is the coefficient of hydraulic resistance. In this case, the drag coefficients of the upper and lower flows must be taken into account.

Dynamic dust collectors. Features:

A feature of dynamic dust collectors is that in such devices, the purification of gases from dust occurs not only with the help of centrifugal force, but also due to the Coriolis force, which occurs during the rotation of the impeller. In such dust collectors, in addition to settling particles, the function of a draft device is also performed.

A dust collector of this type uses more electricity than a fan with the same head and capacity. However, this energy consumption is still less than the required consumption when the centrifugal dust collector and fan are operated separately.

The design of the simplest dynamic dust collectors consists of a casing and an impeller. In this case, the impeller drives the raw gas. And under the influence of the Coriolis force and centrifugal force, dust particles are released from the gas.

Dynamic dust collectors are divided into two groups. The devices of the first group operate in such a way that a gas flow with dust is supplied to the central part of the wheel, and dust particles that are separated during the cleaning process move in the direction of gas supply. Dust collectors of the second group, dust particles move in the direction opposite to the gas movement. In this case, the raw gas is sucked into the drums openings, which are located on its lateral surface.

The most popular dynamic dust extractors are smoke extractors (see fig.). Such devices are used for the initial purification of gases for asphalt concrete plants, linear production. Such dynamic dust collectors are capable of retaining dust particles with a size of at least 15 microns. The impeller on the shaft creates a pressure difference, with which the gases are moved. And under the influence of centrifugal forces, dust particles are thrown away in the periphery, and then removed from the apparatus with a certain amount of gas.