RU2479338C1 - Bag-cartridge filter for air cleaning of impurities - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to cleaning of air or gas, particularly, to aspiration air cleaning. Filter comprises inlet pipe, main dust separator chamber with perforated panels and filtration bags, main bin, module of additional air cleaning with chamber of extra dust separation and filtration cartridges secured at additional perforated panels, chamber of additionally cleaned air, discharge pipe for additionally cleaned air, system for recovery of filtration bags and cartridges by compressed air pulse. Filtration bags are arranged vertically in main dust separation chamber by two spaced apart sections. Besides, filter is equipped with inlet dust separation chamber with opening at front face wall of the main dust separation chamber. Module for additional air cleaning is mounted under cleaned air chamber on rear end wall of the main dust separation chamber and equipped with second chamber of additional air cleaning. Said module is furnished with, at least, one extra outlet pipe for additionally cleaned air, additionally cleaned discharge manifold and vertical air feed lines connected by their one ends with discharge pipes for additionally cleaned air while, by their opposite ends, with additionally cleaned air discharge manifold. Extra perforated panels for attachment of filtration bags are arranged in two spaced vertical rows perpendicular to filter end faces and with rows of extra perforated panels of additionally cleaned air chamber. Transit service passage to filtration bags is arranged above aforesaid chamber in cleaned air chamber. Chambers of additional dust separation are located on both sides of additionally cleaned air chamber and have straight top inlet of cleaned air arranged over entire horizontal cross-section of the chambers. Additionally cleaned air discharge pipes are arranged at additionally cleaned air chamber bottom. Aforesaid and filtration cartridges secured at additional perforated panels in horizontal sections on additionally cleaned air chamber side. Sections of filtration bags and cartridges are equipped with individual system of recovery by compressed air pulse with vertical distributing types. Main and additional bins are equipped with discharge device while automatic gates arranged at outlet of bin dust discharge openings are located on line perpendicular to filter lengthwise axis to allow continuous discharges of caught dust from main and additional bins into one chain conveyor.

EFFECT: higher cleaning efficiency, reduced power consumption, longer life.

3 cl, 19 dwg, 2 tbl

Description

The claimed solution relates to the field of purification of air or gas, as well as mixtures thereof from mechanical impurities, in particular to the purification of aspiration air taken from woodworking grinding machines containing 100% wood grinding dust, which is fire and explosion hazard, and the return of cleaned air to the production room.

The claimed solution can be used in milling, textile, chemical and other industries in which the suction air of production contains 100% fire and explosive dust such as wood grinding.

From the sources of scientific, technical and patent information, a large number of modifications of bag filters are known. Among them, those were selected that have an additional air purification module with filter cartridges that do not have a regeneration system, or that have a common regeneration system with a compressed air pulse along with filter bags, which makes it possible to improve them in the direction indicated in the claims of the claimed solution.

Known bag filter with pulse blowing with compressed air with a control stage of cleaning (non-regenerable filter cartridges), made in the form of a separate unit, and having the brand FR-ID design of SANMED LLC (St. Petersburg), published on the Internet at www. sanmed.su. The specified filter contains a main dust collection chamber, equipped in the upper part with a perforated panel with pipes lowered down and vertically arranged frame filtering sleeves fixed with upper open ends on the pipes, a cleaned air chamber, a hopper with a shutter in the dust outlet located under the main dust collection chamber, an inlet path for entering contaminated air into the main dust collecting chamber, a filter bag regeneration system with a compressed air pulse, otorrhea includes receiver and connected thereto through a pulse valve blocks distributing tube disposed in the clean air chamber and are equipped with impulse pipes which are arranged opposite the outlet openings of the filter bags, the outlet for purified air.

In addition, the filter contains a control stage (module for additional air purification), which includes an inlet pipe for purified air located in the upper part of the control stage, an additional dust collection chamber with horizontally mounted collectors having pipes vertically downward with flanges on which filter cartridges with bottom, collector for output of additionally purified air, service door in the chamber for additional dust collection, transit duct, connections yayuschy outlet of purified air to the inlet control degree. Moreover, the additional dust collection chamber has a flat bottom and is not equipped with a dust outlet, and filter cartridges are made non-regenerable.

The filter is as follows.

Contaminated air flow through the inlet pipe enters the upper part of the dust chamber. Sinking down along the filter bags, the contaminated air passes through the filter bags, is first cleaned in them and exits through the open ends of the bags into the cleaned air chamber, from which it enters the transit duct through the exhaust pipe and then through the inlet pipe of the control stage for air purification to the upper part additional dust collection chambers. Then the cleaned air is lowered between the collectors and pipes along the cartridges, being filtered inside the cartridges. Inside the cartridges, the additionally purified air rises up into the pipes of the collectors of the additionally purified air and exits through the collector of the output of the additionally purified air into the recirculation duct of the aspiration system.

Dusty filter bags periodically (≈10 times per hour) undergo sequential sequential regeneration by blowing them with a pulse of compressed air. Wood dust discharged during the regeneration of filter bags is deposited in a hopper, from which it is discharged into a motor vehicle through a manual shutter. Fine dust falling from the working surface of the filter cartridges falls onto the flat bottom of the additional dust collection chamber and is periodically removed from it through the service door.

The above filter analog has the following disadvantages.

1. The filter has an increased hydraulic resistance at the beginning of the filtering mode of the cartridges, equal to ΔР _ФН = 1500 Pa, which increases the installation power of the electric motor of the centrifugal fan of the suction system N _y (kW) and causes increased energy consumption for cleaning the air in the filter at the beginning of the filtering mode.

2. The filter has an increased hydraulic resistance at the end of the filtration mode of the filtering cartridges, equal to ΔР _ФН = 2000 Pa, which increases the installed power of the centrifugal fan motor N _y (kW) and causes increased energy consumption for cleaning the air in the filter at the end of the filtration mode.

Increased energy costs for air purification will reduce the energy efficiency of the filter and increase operating costs for the payment of electricity consumed by the centrifugal fan drive motor.

3. The filter cartridges of the control stage of filter air purification are not equipped with a compressed air regeneration system, which leads to the accumulation of a layer of dust on the outer working surface of the filter cartridges and the dust from the cartridges spilling onto the flat bottom of the additional dust collection chamber, which, if an electrostatic discharge occurs in the filter cartridges or wood dust ignition in the main dust collection chamber will lead to an explosion of accumulated dust in the additional dust collection chamber to control stage of air purification and combustion of filter cartridges and their replacement with a new set of cartridges, which will cause increased operating costs.

4. The control stage of air purification does not have a hopper, and the additional dust collection chamber is made with a flat bottom and does not have a dust outlet, which causes increased operating costs for removing dust from the bottom of the additional dust collection chamber.

5. The filter has vertically arranged filter bags and cartridges, as well as an upper input of polluted air into the main dust collection chamber and an additional dust collection chamber and an upper outlet of purified air from the filter bags and additionally purified air from the filter cartridges, which causes increased pressure loss through the air passage through filter bags ΔР _ФР and filter cartridges ΔР _Фк (Pa) and reduces the energy efficiency of the filter

According to claim 1, the disadvantages of the filter analog.

The increased hydraulic resistance of the filter at the beginning of the filtering mode of the cartridges, equal to ΔР _ФН = 1500 Pa, is due to the following.

1. The filter does not have an inlet dust chamber, but is equipped with a direct inlet of contaminated air through an inlet pipe into the upper part of the main dust chamber, which causes increased pressure loss at the inlet ΔP _in1 (Pa).

2. The filter is made of separate blocks (bag filter and control stage of air purification), between which there is a transit air duct of purified air. This design causes unnecessary pressure loss:

- to the outlet of the purified air from the chamber of the purified air ΔР _out (Pa) in the form of a sudden narrowing;

- at the entrance of purified air to the control stage ΔP _I (Pa) in the form of a sudden expansion.

3. The collectors in the additional dust collection chamber of the control stage of air purification take up a lot of space, which reduces the cross-sectional area for the passage of purified air to the filter cartridges and, as a result, increase the speed of air passage to the cartridges. This causes increased pressure losses on the passage of purified air to the filter cartridges AR _pr (Pa).

4. The collectors of additionally purified air of the control stage have vertically lowered pipes to which the cartridges are attached. Such a construction causes additional loss of pressure at the input of the vertical tubes in the headers? P _ave (Pa).

According to claim 2, the disadvantages of the filter analog.

The increased hydraulic resistance of the filter at the end of the filtering mode of the cartridges, equal to ΔР _fc = 2000 Pa, is due to the absence of a filter cartridge regeneration system in the control stage. This causes accumulation of the dust layer on the working surface of the filter cartridge to the magnitude of its hydraulic resistance .DELTA.P .DELTA.P = _{n fc} -ΔR _fnl = 2000-1500 = 500 Pa.

According to claim 3, the disadvantages of the filter analogue.

A dust explosion in the control stage of air purification will cause the combustion of filter cartridges and their replacement with a new set, which increases operating costs for the purchase of a new set of filter cartridges and their installation in the chamber for additional dust collection.

According to claim 4, the disadvantages of the filter analogue.

Dust removal from the bottom of the additional dust collection chamber of the control cleaning stage can be carried out only after dismantling critically dusty cartridges (at ΔР _n = 500 Pa) and is carried out through the service door.

According to claim 5, the disadvantages of the filter analog

The upper inlet of contaminated air into the filter bags and cartridges and the upper outlet of the purified and additionally purified air from them leads to a turn of the additionally purified air relative to the purified by 180 °, which increases the pressure loss in the filter bags ΔР _fr and filter cartridges ΔР _fc (Pa).

Known bag filter cartridge brand SRF10KR design LLC "ECOFILTER", published on the Internet at www.efilter.ru. comprising at least one module with two-stage air purification, including a main dust-collecting chamber, equipped in the upper part with perforated panels with downpipes and vertically arranged frame filter sleeves fixed with upper open ends on the nozzles, a purified air chamber, a main hopper with an automatic shutter in a dust outlet located under the main dust collecting chamber, an inlet pipe for introducing contaminated air into the main chamber a dust collection unit located in its upper part, an additional purified air module comprising an additional dust collection chamber with horizontally arranged additional perforated panels and filter cartridges vertically mounted on additional perforated panels, an additional purified air chamber with an outlet pipe for additional purified air, an additional hopper with a lock unloader in the dust outlet, located under the camera additional dust capitation, a special duct for the purified air from entering the clean air chambers in the additional dust collecting chamber adjacent to the main dust collecting chamber sensors accumulating collected dust level set in the basic and additional bins. In this case, the chambers of purified and additionally purified air are separated by a vertical partition, and the perforated panels of the main and additional dust collection chambers are located at the same level. The module has an air capacity of L = 10,000 m ³ / h. A filter of any capacity (up to 100,000 m ³ / h) is collected from the indicated dust-collecting modules.

Despite the large number of coinciding features of the prototype and the proposed solution, the absence of distinctive features of the latter in the prototype does not provide a technical result consisting in increasing the total efficiency of air purification and energy efficiency of the filter, reducing its specific gravity and increasing the service life of a set of filter bags and cartridges for the following reasons .

1. The filter is made of separate dust collection modules with a capacity of each module L _i = 10000 m ³ / h. Of these modules, a filter of any capacity is compounded, up to L _Σ = 100000 m ³ / h. With a filter capacity of, for example, L _Σ = 80,000 m ³ / h, a filter with suction and centralized dust collection systems in storage containers has:

- 8 inlet pipelines of polluted air,

- 8 recirculating air ducts with air distributors,

- 16 sluice unloaders at the outlet of the dust outlet of the bunkers,

- 8 fire retardant valves,

- 8 fire extinguishing systems,

- 8 centrifugal fans with individual starting equipment and frequency converters for electric motors,

- 8 receivers of compressed air,

- 14 intermediate walls of the chambers of the main and additional dust collection in size (3.1 × 2.4) m, with a total area of 104 m and a thickness of 2 mm,

- 16 service doors with a size (2.5 × 1.2) m with sealing cords, a total length of 118 lm,

- 16 taps for connecting the exhaust pipes of the modules through the ducts to the suction pipes of centrifugal fans,

- 8 closed-chain scraper conveyors manufactured by Grain-Wood for moving trapped dust from the primary and secondary hoppers of eight modules to storage containers for centralized dust collection; two fire extinguishing systems firefly ab (Sweden), each of which serves 4 inlet pipelines of polluted air; 8 dust storage containers. The listed amount of component equipment increases the metal consumption and the specific gravity of the filter G ^Y ₀ t / (thousand m / h), as well as the cost of the filter.

Two fire extinguishing systems firefly ah (Sweden) cost 18 thousand € (720 thousand rubles). Eight frequency converters for centrifugal fan motors cost 8 × 1.5 = 12 thousand € (480 thousand rubles). Eight conveyors manufactured by Grain-Wood, each of which has a length of 15 m and a cost of 14.5 thousand €, cost 8 × 14.5 thousand € × 42 rubles = 4.9 million rubles.

2. A filter with a capacity of, for example, L _Σ = 80,000 m ³ / h has 16 gateway unloaders with electric drives (N _y = 0.75 kW) and 8 chain scraper conveyors with electric drives (N _y = 3.0 kW) to move the catch dust to storage containers, which increases the energy consumption for unloading the captured dust and reduces the energy efficiency of the filter Ф,%.

3. The filter modules do not have an inlet dust chamber for entering contaminated air. Instead of the dust chamber, the modules have a direct top entry of polluted air through the end wall of the module into the main dust chamber and the honeycomb arrangement of the filter bags, which makes it difficult for polluted air to pass between the bags. This design causes large pressure losses on the input of polluted air P _in (Pa) into the main dust collection chamber of the module and, as a result, increases the hydraulic resistance of the filter modules ΔP _mod (Pa), which causes an increase in the installed power of the main fan motor N _Y , which increases energy consumption for air purification and reduces the energy efficiency of the filter F,%.

4. With direct entry of contaminated air into the filter modules, there will also be increased abrasive wear of the filter bags located in the first row from the inlet pipe, which reduces their service life and will require the purchase of an additional set of filter bags. Thus, the direct inlet of contaminated air flow causes increased operating costs for the purchase of an additional set of filter bags and their installation in the first row of the main dust collection chamber of each filter module after abrasive wear of the main set of filter bags in the first row.

5. Filter cartridges are located vertically in the additional dust collection chambers of the filter modules, and purified air is supplied to them through a special vertical channel with a lower air outlet from it and an upward air flow of purified air in the additional dust collection chamber. After regeneration of the filter cartridges, the dust discharged from the cartridges by a pulse of compressed air will be raised by the upward air flow back to the filter cartridges and settle on them, which is due to the following. The dust captured by the filtering cartridges is a light fraction passing through the filtering sleeves in the form of a breakthrough and having a particle size of up to 10 μm. Such fine dust particles have a low soaring speed V _s (m / s). In this case, the velocity of the ascending air stream V _sc exceeds the speed of the soaring V _{s of} most dust particles, i.e. V _ad > V _s . The formation of such a condition provides the reverse rise of a significant amount of discharged dust to the filter cartridges. The secondary rise of dust to the filter cartridges requires more frequent regeneration, which is provided in the prototype filter by the general system of regeneration of filter bags and cartridges. With a general regeneration system, filter cartridges are regenerated with the same frequency in time as filter bags (10 regenerations per hour), which causes an increased consumption of compressed air and, as a result, increased operating costs. In addition, such frequent regeneration reduces the life of the cartridge package, which causes additional operating costs for the purchase of a new cartridge package. For 1 year during two-shift operation (4168 hours) with 10 cartridge regenerations per hour, 4168 × 10 reg = 41680 regenerations will be carried out. With this number of regeneration, the service life of a set of cartridges is T _SL = 1 year. When cartridges are installed as the second stage of cleaning after filter bags, the dust accumulation rate on the cartridges sharply decreases, which allows to reduce the regeneration frequency by 10 times (1 time per hour) and increase the life of the cartridge set by 5 times, i.e. from 1 year to 5 years, however, with a common system of regeneration of filtering sleeves and cartridges, this is impossible.

6. If the filter cartridges are located vertically in the chambers of additional dust collection of the filter modules, if it is necessary to check the operability of the filter cartridges located in the last row from the service door, it is necessary to dismantle all the filter cartridges located in the previous rows, and then, after checking, install them on your working locations, which causes additional maintenance costs.

7. The filter modules have a common system for regenerating filter bags and cartridges with a pulse of compressed air, which is connected to a factory compressor station that prepares compressed air up to pollution class 9 according to GOST 17433-80, according to which the content of some impurities in compressed air is allowed up to 4 mg / m ³ , and the size of the solid particles can be up to 80 microns. The general system of regeneration of filter bags and cartridges leads to frequent regenerations of filter cartridges (10 regenerations per hour), which cause contaminants in compressed air to enter the cleaned air with a time interval of 6 minutes, which reduces the efficiency of air purification E _mode ( %) in the modules in the regeneration mode of filter cartridges and worsens the sanitary and hygienic conditions of work in the workshop.

8. Compressed air receivers with pulse valves are located in the cleaned air chambers of the filter modules, which will require the installation of service hatches in the cleaned air chambers and the presence of sealing cords that will wear out, which will cause operating costs.

The task of improving the sanitary and hygienic conditions of work in the workshop, reducing the cost of the filter and reducing operating costs, the implementation of which the claimed solution is aimed at, consisted in further improving the well-known design of the filter bag-cartridge for air purification from mechanical impurities, which include 100% polished wood dust, and obtaining a technical result - increasing the total efficiency of air purification and energy efficiency of the filter, reducing its specific weight and increase the service life of the set of filter bags and cartridges.

The achievement of the above technical results is ensured by the fact that a bag-and-cartridge filter for purifying air from mechanical impurities, comprising a main dust collecting chamber, provided with perforated panels in the upper part and vertically arranged frame filtering sleeves fixed with upper open ends on perforated panels, the purified air chamber, main hopper with automatic shutter at the outlet of the dust outlet, located under the main dust collection chambers at least one inlet port for introducing contaminated air, an additional air purification module comprising an additional dust collection chamber with additional perforated panels and filter cartridges having a central opening in the bottoms and mounted on additional perforated panels, an additional purified air chamber with an outlet pipe for additionally purified air, an additional hopper with an automatic shutter at the outlet of the dust outlet, placed located under the additional dust collection chamber, a system for regenerating filter bags and cartridges with a compressed air pulse, which includes a compressed air receiver and transfer tubes connected to it through pulse valve units located in the chambers of cleaned and additionally cleaned air and equipped with pulse tubes located opposite the outlet openings from filtering sleeves and cartridges, characterized in that the filtering sleeves are placed in the main dust collecting chamber with two bagging projections with a gap between them, forming a service passage between the open ends of the filter bags of both hose sections in the cleaned air chamber on the perforated panels, the filter is equipped with an inlet dust settling chamber adjacent to the front end wall of the main dust collecting chamber, which is made with a window in the front end wall placed opposite the gap between the sections of the filter bags, an additional air purification module is installed under the purified air chamber from the rear end wall the main dust collection chamber of the bag filter and is equipped with a second additional dust collection chamber with an individual additional hopper and an automatic shutter at the outlet of the dust outlet, at least one additional exhaust pipe for additional purified air, an additional purified air outlet manifold and vertical ducts connected at one end with exhaust nozzles for additionally purified air, and at the other end - with an exhaust manifold flax purified air, additional perforated panels for attaching filter cartridges are installed in the additional air purification module vertically in two parallel rows with a gap between them and perpendicular to the end walls of the filter with additional purified air in the space between the rows of additional perforated panels, which is made with a service door and equipped with a bottom and a ceiling panel, hermetically connected by its sides with additional perforations By the oval panels and forming a service corridor inside the chamber, and on top of the chamber there is a transit service passage in the cleaned air chamber to the filtering sleeves, additional dust collection chambers are located on both sides of the additional cleaned air chamber and have a direct upper purified air inlet over the entire horizontal section of the chambers, and exhaust pipes for additionally purified air are installed in the bottom of the chamber of additionally purified air, filter cartridges are placed horizontally section and which are installed in the additional dust collection chambers from the side of the additional purified air chamber and are mounted on additional perforated panels by flange mounting and putting on the bottom of the cartridges with holes on the cylindrical supporting rods, cantilever mounted in the center of the bottom of the cartridges on the inner surfaces of the outer walls of the additional dust collection chambers with the formation of additional cartridge support on cantilever mounted cylindrical rods having on at the free ends, a stepped threaded surface with threads of large and small diameters, providing screwing on a small diameter thread of a mounting cylindrical guide with an internal thread for putting on the bottoms of the cartridges and inserting bottoms on the threads of large diameter with the installation of fixing nuts on them with sealing washers after screwing mounting rail and the formation of tight connections of washers with the bottoms of the cartridges, sections of filter bags and cartridges are provided with individual and compressed air regeneration systems with vertically arranged compressed air distribution tubes for the regeneration of filter cartridges, in addition, receivers with pulse valves integrated in the regeneration systems of the filter bag sections and cartridges with a compressed air pulse are located in closed boxes with hinged lids that are installed on the roof chambers of cleaned air and equipped with transit tubes for supplying compressed air, which are connected to the distributing tubes of the compressed air air through the filtering sleeves and cartridges through flexible tubes, while the main and additional bins are equipped with unloading devices, and the automatic shutters installed at the outlet of the dust outlets of the bins are located on the same line perpendicular to the longitudinal axis of the filter, ensuring continuous discharge of trapped dust from main and additional hoppers in one closed chain scraper conveyor.

In the manufacture of a filter from welded sections, the filter is equipped with a docking module for connecting the additional air purification module with a bag filter containing a support section, a hopper section, a sleeve-cartridge section with a dividing wall, and a purified air chamber section, which are installed one on the other and subjected to a control assembly with installation control pins, while the main dust chamber is divided in height by a flange connector with the formation of the upper and lower parts of the chamber, the last of which is to attached to the main hopper.

In the manufacture of the filter from the panels made in the form according to Fig. 19, assembled into the product by means of bolt fasteners, the additional air purification module is installed with a gap between its end wall and the rear end wall of the main dust collecting chamber and the connecting section having an inserted section into the purified air chamber having width equal to the width of the resulting gap.

The evidence of the materiality of the differences and the relationship of the distinguishing features with the achieved technical results are disclosed sequentially in the following order:

1. The increase in the total efficiency of air purification in the filter E,%.

2. Increasing the energy efficiency of the filter f,%.

, т/(тыс.м³/ч).3. Reducing the specific gravity of the filter

, t / (thousand m ³ / h).

4. The increase in the service life of a set of filter bags and cartridges T _SL , years.

The technical result, which consists in increasing the total efficiency of air purification E,% in the filter, is provided by the following advantages of the proposed solution over the prototype:

1. The filter has an increased efficiency of air purification in the filtration mode E _f ,%, obtained by introducing into the filter the third stage of air purification in the form of an input dust-settling chamber with a cleaning coefficient η ₁ = 0.5.

2. The filter has decreased to 10 times the amount of instantaneous pollution emissions of the filter cartridge in the chamber per hour further purified air entering therein from the compressed air ^of the cleaning class 9 and deposited on the inner surface of a clean cartridge during regeneration and a pulse of compressed air emitted into the chamber of additionally purified air at the beginning of the filtration mode of the regenerated filter cartridges.

The total coefficient of air purification in the filtering mode of the air flow η _f is:

- for the inventive filter η _f2 with a cleaning coefficient in the input dust-collecting chamber η ₁ = 0.5, filtering sleeves η ₂ = 0.999, filtering cartridges η ₂ = 0.9998 (three stages of cleaning)

η _f2 = 1- (1-η ₁ ) (1-η ₂ ) (1-η ₃ ) = 1- (1-0.5) (1-0.999) (1-0.9998) = 0.9999999;

- for the prototype filter (two stages of cleaning)

η _f1 = 1- (1-η ₂ ) (1-η ₃ ) = 1- (1-0.999) (1-0.9998) = 0.999998.

In this case: a) The efficiency of air purification in the filtering mode of the air flow E _F ,% is:

- for the inventive filter E _F2 ,%

E _F2 = 100η _p2 = 100 * = 0.9999999 99.99999%

- for the filter prototype E _F1 ,%

E = 100η _{F1 F1} = 100 × 99.9998 = 0.999998%.

b) The slip coefficient in the filtering mode of the air flow N _f is:

- for the inventive filter N _Ф2

N _Ф2 = (1-η _Ф2 ) = 1- (1-0,9999999) = 0,0000001

- for prototype filter

N _Ф2 = (1-η _Ф1 ) = 1- (1-0,999998) = 0,000002.

c) The dust concentration in the cleaned air С _К , mg / m ³ for the plywood grinding workshop at the initial dust content in front of the filter С _Н = 6950 mg / m ³ (in the supply pipe) will be:

for the inventive filter With _K2

С _K2 = С _Н · N _Ф2 = 6950 · 0.0000001 = 0.000695 mg / m ³ ;

for the filter prototype C _K1 ;

With _K1 = C _H · N _F1 = 6950 · 0.000002 = 0.0139 mg / m ³ .

The decrease in the concentration of dust in purified air in the inventive filter With _K2 in this case, compared with the filter prototype With _K1 is

A 10-fold reduction in the number of instantaneous emissions of contaminants from filter cartridges into the chamber of additionally purified air is ensured by replacing the general regeneration system for filter bags and cartridges with individual regeneration systems, which made it possible to reduce, in accordance with the calculation example on pages 61-62, the number of regeneration cycles of filter cartridges from 10 regenerations per hour in the prototype filter to 1 regeneration per hour, i.e. reduce the number of regenerations of the filter cartridges cycles 10 times and reduced in the same number of times instantaneous emission of impurities from the filter cartridge in the chamber is further purified air coming therein from the compressed air 9 ^of the cleaning class, which increases the stability obtain the total air purification efficiency in the filter, equal to E = 99.99999% in time.

Obtaining these advantages is carried out due to technical solutions 1 and 2.

Technical Solution 1

The filter is equipped with an input dust settling chamber adjacent to the front end wall of the main dust collecting chamber, which is made with a window in the front end wall located opposite the gap between the sections of the filter bags.

Technical Solution 2

The sections of the filter bags and cartridges are equipped with individual compressed air regeneration systems with vertically arranged compressed air distribution tubes for regenerating the filter cartridges; in addition, the receivers with pulse valves for the regeneration systems of the filter bags and cartridge sections regenerated by the compressed air pulse are located in closed boxes with hinged covers which are installed on the roof of the purified air chamber and are equipped with transit tubes for supplying zhatogo air, which are connected to a compressed air distributing tubes of filter bags and cartridges through flexible tubing.

The technical result, which consists in increasing the energy efficiency of the filter (hereinafter referred to as increasing energy efficiency), is ensured by the following advantages of the proposed solution over the prototype:

1. A smaller total installed power of electric drives of automatic gateway unloaders and chain conveyor conveyors of closed type manufactured by Grainwood due to their reduced number.

2. Lower hydraulic resistance of the filter ΔP _f ~ 750 Pa due to the improved aerodynamics of the filter housing.

The decrease in the total installed capacity of the electric motors of the drives of the dust unloading mechanisms in the inventive filter compared to the prototype filter was determined by the formula

ΔN _OUT = N _OUT1 -N _OUT2

In the filter prototype (var. 1), having 4 modules and a total capacity of L _f = 40,000 m ³ / h, it is established:

- 8 automatic gateway unloaders with electric motors N _i = 0.75 kW; 8 × 0.75 = 6.0 kW;

- 4 chain scraper conveyors with electric motors N _i = 3.0 kW;

4 × 3.0 = 12.0 kW.

Then N _OUT1 = 6.0 + 12.0 = 18.0 kW.

In the inventive filter (var. 2) with a capacity of L = 45000 m ³ / h it is established:

- 3 automatic gateway unloaders with electric motors N _i = 0.75 kW;

3 × 0.75 = 2.25 kW;

- 3 screws in bins with electric motors N _i = 1,1 kW

3 × 1.1 = 3.3 kW;

- 1 chain scraper conveyor with electric motors N _i = 3.0 kW;

1 × 3.0 = 3.0 kW.

Then N _Vyg2 = 2.25 + 3.3 + 3.0 = 8.55 kW.

In this case, the difference in the installed capacity of the electric motors of the dust discharge system in var. 1 and 2 will be

ΔN _OUT = N _OUT1 -N _OUT2 = 18.0-8.55 = 9.45 kW.

Improved aerodynamics of the housing of the claimed filter is provided:

a) replacing the direct inlet of the contaminated air stream into the main dust collection chambers of the prototype filter modules with an inlet dust settling chamber, which reduces pressure losses at the filter inlet ΔP _in (Pa) and filter hydraulic resistance ΔP _{f by} about 10%;

b) the implementation of the front end wall of the main dust collection chamber with a window for an additional outlet of contaminated air with dimensions having a height equal to the length of the filter bags l _p = 2.8 m and a width equal to the width of the gap between the hose sections B _s = 0.65 m forming the window area S = l _p × B _s = 2.8 × 0.65 = 1.82 m ² . An additional window increases the area of openings for the exit of contaminated air from the dust chamber by 55% (1.82 / 3.317 · 100%). Moreover, for a filter with a productivity of L _f = 45000 m ³ / h, the air exit velocity from the dust precipitation chamber V _out decreases from 3.8 to 2.4 m / s, which reduces pressure loss on the air outlet from the dust precipitation chamber and, as a result, hydraulic resistance of the filter ΔP _f (Pa);

c) the installation of additional dust collection chambers under the purified air chamber with the provision of a direct upper intake of purified air over the entire horizontal section of the chambers, eliminating:

- a special duct with a downward flow of purified air, which has a pressure loss due to friction ΔР _Tr (Pa), to exit the cleaned air chamber ΔР _out and to enter the chamber for additional dust collection ΔР _вх (Pa);

- a vertical loop for the passage of purified air into the chamber for additional dust collection in each prototype filter module with a 180 ° rotation around the wall to form an upward air flow when the purified air enters the chamber for additional dust collection, which has a pressure loss of ΔP _rot (Pa). Thus, the direct upper inlet of purified air over the entire horizontal section of the chambers of additional dust collection reduces the hydraulic resistance of the filter ΔP _f (Pa);

с 5,2 до 2,6 м/с, т.е. в 2 раза. Такое уменьшение скорости выхода воздуха из картриджей уменьшает потери давления на выход воздуха из картриджей

в 2 раза и, как следствие, снижает гидравлическое сопротивление фильтра;g) the use of two parallel dust collection chambers in the filter with a reduced length of filter cartridges (l _K = 0.8 m) and a productivity of L _K = 500 m ³ / h, which is compared to the prototype filter having a cartridge length of 1 _K = 1600 mm and productivity L _K = 1000 m ³ / h, allows for d _knp = 360 mm and d _kvn = 260 mm to increase the area of the outlets from the cartridges by 2 times. This reduces the output rate of additional purified air from the cartridges.

from 5.2 to 2.6 m / s, i.e. 2 times. Such a decrease in the rate of exit of air from the cartridges reduces pressure loss on the exit of air from the cartridges

2 times and, as a result, reduces the hydraulic resistance of the filter;

e) by placing exhaust pipes for additionally purified air in the bottom of the chamber of additionally purified air, which causes the movement of the cleaned air from the purified air chamber to the centrifugal fan from top to bottom, which provides:

1. A decrease in the length of the recirculation duct in one prototype filter module in the area from the filter to the suction port of the centrifugal fan by about 6 m and, as a result, a decrease in friction pressure loss ΔР _tr (Pa) in it;

2. Replacement of eight taps with a rotation angle α = 90 ° in the filter prototype modules with a collector for output of additionally purified air, which reduces pressure losses in local resistances ΔР _ms (Pa).

(Па) за счет подключения вертикальных воздуховодов к днищу каждой сварной секции, имеющих площадь живого сечения, например, при d_вв=0,6 м и L_ф=45000 м³/ч, F_Σ=1,13 м² и скорость выхода воздуха

3. Reducing pressure loss to the outlet of additionally purified air from the chamber of additionally purified air

(Pa) by connecting vertical ducts welded to the bottom of each section having a free area, e.g., with d = 0.6 m _cc and _f L = 45000 m ³ / h, F _Σ = 1,13 m ² and the output speed air

Reducing the hydraulic resistance of the inventive filter by ΔP _f = 750 Pa reduces the pressure developed by a centrifugal fan with H _B1 = 4750 Pa in the prototype filter to H _B2 = 4000 Pa in the inventive filter.

In this case, the rated power of the fan drive electric motor will be:

a) in the prototype filter module

installed power N _Byi = 18 kW.

The installed capacity of electric motors in the drives of four fans will be N _BY1 = 4N _Byi = 4 · 18 = 72 kW.

b) in the inventive filter with L = 40,000 m ³ / h (taken instead of 45,000 m ³ / h for comparability of the calculation)

Installed capacity

N _BY2 = 55 kW.

Total installed power of electric motors:

a) in the filter prototype

N _Y1 = N _gain1 + N _BY1 = 18.0 + 72 = 90.0 kW.

b) in the inventive filter

N _Y2 = N _gain2 + N _BY2 = 8.55 + 55 = 63.55 kW.

The annual savings in energy consumption in the inventive filter in comparison with the filter prototype will be, kW · h / year

ΔN _Σ = m (N _Y1 -N _Y2 ) = 4168 (90.0-63.55) = 110244.

Total annual energy consumption in the filter prototype, kW · h / year

N _Σ1 = mN _Y1 = 416890.0 = 375120 kWh / year.

The increase in energy efficiency of the proposed filter compared to the filter prototype will be

According to the State Program on Energy Saving and Improving Energy Efficiency of the Country until 2020, approved by the Government of the Russian Federation in 2010, all energy savings obtained when creating new equipment must be converted into tons of equivalent fuel (t.t.), which form resource saving.

The annual resource saving from using the inventive filter with its productivity L _f = 45000 m ³ / h in comparison with the prototype filter will be

where 29.33 is the specific calorific value of the equivalent fuel, MJ / kg;

3.6 - conversion factor kW / h in MJ;

10 ³ - conversion factor kg to tons;

η _ES = efficiency of the block power plant.

For pulverized coal power plant η _ES = 0.341.

Improving the energy efficiency of the proposed filter in comparison with the filter prototype at F = 29.4% will provide:

a) annual savings from energy conservation in 2013 when investing in 2012, thousand rubles / year

where T _N is the tariff for electric energy in St. Petersburg in 2012, rubles / kWh. T _N = 4.0;

K _INF - inflation rate, K _INF = 1,07.

b) the annual environmental effect in the form of a reduction in the emission of carbon dioxide CO ₂ into the atmosphere from uncombusted fuel equivalent (39.7 tons of equivalent fuel / year) in the amount of ΔCO ₂ , tons

ΔCO ₂ = ΔB _N · 2.76 = 39.7 · 2.76 = 109.6 t / year,

where 2.76 is the equivalent in tons of carbon dioxide CO ₂ emitted to one ton of standard fuel burned (t equivalent fuel).

The resulting reduction in carbon dioxide emissions into the atmosphere will help to reduce the formation of the greenhouse effect in the atmosphere.

Obtaining these advantages is carried out due to technical solution 3.

Technical Solution 3

The filter bags are placed in the main dust collection chamber with two bag sections with a gap between them, which forms a service passage between the open ends of the filter bags in both bag sections in the cleaned air chamber on the perforated panels, an additional air purification module is installed under the cleaned air chamber from the rear end wall of the main dust collector bag filter chamber and is equipped with a second chamber for additional dust collection with an individual additional hopper and a user-friendly unloader at the outlet of the dust outlet, at least one additional exhaust pipe for additionally purified air, a collector for outputting additionally purified air, and vertical ducts connected at one end to exhaust pipes for additionally purified air, and at the other end with a collector for outputting additionally purified air , additional perforated panels for attaching filter cartridges are installed in the vertical air purification module flaxen in two parallel rows with a gap between them and perpendicular to the end walls of the filter with the placement of additional purified air in the space between the rows of additional perforated panels of the chamber, which is equipped with a bottom and a ceiling panel sealed by their sides with additional perforated panels and forming a service corridor inside the chamber and on top of the chamber there is a transit service passage in the cleaned air chamber to the filtering sleeves, the additional dust chamber Pourings are placed on both sides of the chamber of additionally purified air and have a direct upper inlet of purified air over the entire horizontal section of the chambers, and the outlet pipes for additionally purified air are installed in the bottom of the chamber of additionally purified air, filter cartridges are placed horizontally by sections that are installed in chambers of the additional dust collection from the side of the chamber of additionally purified air and cantilever mounted on additional perforated panels through of flange mounting and putting on the bottoms of the cartridges with holes on the cylindrical supporting rods, cantilever mounted in the center of the bottoms of the cartridges on the inner surfaces of the outer walls of the additional dust collection chambers with the formation of additional cartridge supports on cantilevered cylindrical rods having a stepped threaded surface with large and small threads on the free ends diameters for screwing onto a small-diameter thread of a mounting cylindrical guide with internal thread for putting on it the bottoms of cartridges and inserting bottoms on large-diameter threads with the installation of fastening wing nuts with sealing washers on them after screwing the mounting rail and the formation of tight joints of washers with the bottoms of the cartridges, while the main and additional hoppers are equipped with unloading devices and the gateway unloaders installed at the outlet of the dust outlets of the hoppers are located on one line perpendicular to the longitudinal axis of the filter, with continuous unloading of captured dust from the main and additional bins into one closed chain scraper conveyor.

Technical solution 3 allows for the replacement of the 4-module filter prototype of the inventive filter to reduce the number of cameras:

- the main dust collecting chambers 4 times,

- additional dust collection chambers 2 times.

This allows you to reduce:

a) the number of gateway unloaders with 8 in the filter prototype up to 3, i.e. reduce 5 drives with electric motors having an installed power of N _Y = 0.75 kW;

b) the number of closed chain conveyor conveyors from 4 to 1, i.e. cut 3 drives with electric motors having an installed power of N _Y = 3.0 kW;

c) reduce the hydraulic resistance of the filter ΔP _f by 750 Pa;

d) reduce the number of centrifugal fans from four to one, which will ensure, with reduced hydraulic resistance of the proposed filter, a decrease in the total installed power of the fan motors from 72 kW in the prototype filter to 55 kW.

, т/(тыс.м /ч) обеспечивается следующими преимуществами заявляемого решения перед прототипом:The technical result, which consists in reducing the specific gravity of the filter

, t / (thousand m / h) is provided by the following advantages of the proposed solution over the prototype:

1. The inventive filter does not have a separation into modules, which allowed by introducing unloading devices into the main and additional bins to increase the length of the bins and, as a result, the length of the main and additional dust collection chambers, to place in them all filter bags and cartridges located in 4 filter prototype modules, and create a high-performance filter L _Ф = 45000 m ³ / h with one inlet dust-collecting chamber for entering contaminated air and one dust outlet in the main and additional bunkers. Such a design of the claimed filter performance when L _F = 45000 m ³ / h, as compared with four prototype filter modules having a total capacity L _Σ = 40000 ^m3 / h, allows:

a) reduce:

- 4 times the number of main dust collecting chambers, purified air chambers and additionally purified air chambers;

- 2 times the number of additional dust collection chambers;

- 2 times the number of supply pipelines of polluted air, additional bunkers;

- 4 times the number of: recirculating air ducts with air distributors, main bunkers, sluice unloaders at the outlet of the bunker dust outlets, fire retardant valves, fire extinguishing systems, centrifugal fans with starting equipment and frequency converters for electric motors, closed-type conveyors manufactured by Grain-Wood for moving dust trapped in the filter prototype modules to storage containers for centralized dust collection;

b) eliminate:

- six intermediate walls of the modules with a total area of 6 × 3.1 × 2.4 = 44.6 m ² with a thickness of 2 mm;

- 8 outlets in four recirculation ducts for their connection to the suction nozzles of centrifugal fans;

c) replace:

- 24 m of recirculation air ducts (4 × 6 m) for connecting centrifugal fans to the suction nozzles for 8 m of air ducts (4 × 2 m) for outputting additionally purified air with a collector for outputting additionally purified air;

- 4 large side service doors in the main dust collection chambers, 4 large side service doors in the additional dust collection chambers and 4 service hatches in the cleaned air chambers for servicing the pulse valves of the receivers for 2 small service doors for entering the cleaned and additionally cleaned air chambers.

составит:According to Ecofilter LLC, a filter prototype with a capacity of L _F1 = 40 thousand m ³ / h, together with four transverse scraper chain conveyors for removing trapped dust with a total length of 52 m, has a weight equal to G _F1 = 31600 kg = 31.6 t, and the inventive filter with a capacity of L _Ф2 = 45 thousand m ³ / h, respectively - G _Ф2 = 28200 kg = 28.2 tons. Then the specific gravity of the filters

will be:

- prototype filter

- the claimed filter

, т/(тыс.м³/ч) по сравнению с удельным весом

фильтра-прототипа с учетом вновь вводимого оборудования (пылеосадочной камеры, разгрузочных устройств в основном и дополнительных бункерах и системы индивидуальных ресиверов сжатого воздуха для порядной регенерации фильтрующих картриджей), рассчитанное для производительности заявляемого фильтра L_Ф2=45 тыс.м³/ч, составилоThe reduction in the specific gravity of the inventive filter

, t / (thousand m ³ / h) in comparison with the specific gravity

filter prototype, taking into account the newly introduced equipment (dust chamber, unloading devices in the main and additional bins and the system of individual compressed air receivers for the orderly regeneration of filter cartridges), calculated for the performance of the proposed filter L _Ф2 = 45 thousand m ³ / h, amounted to

заявляемого фильтра по сравнению с фильтром-прототипом для производительности L_Ф=45000 м³/ч обеспечило уменьшение себестоимости заявляемого фильтра на 1500 тыс.руб. (1,5 млн.руб.).The resulting reduction in specific gravity

of the claimed filter in comparison with the filter prototype for a productivity of L _Ф = 45000 m ³ / h ensured a reduction in the cost of the claimed filter by 1500 thousand rubles. (1.5 million rubles).

To ensure total productivity L _Σ = 90,000 m ³ / h, the nine filter prototype modules are replaced by two inventive filters with L _f = 45,000 m ³ / h, which are installed with the end walls of the input dust-settling chambers of contaminated air adjacent to each other and four pipelines of contaminated air in parallel in one row on one group of sequentially installed supporting supports.

, как и при производительности фильтра L_ф=45000 м³/ч.In this case, the decrease in the specific gravity of the inventive filter G _F2 remains the same

, as with filter performance L _f = 45000 m ³ / h.

Obtaining these advantages is carried out due to technical solutions 1 and 3.

Below is the contribution of each significant feature of technical solutions 1 and 3 to the technical result - a decrease in the specific gravity of the filter.

1. Fixing the filter bags with open ends on the perforated panels and placing the bags in the main dust collecting chamber with two bag sections with a gap between them, forming a service passage in the cleaned air chamber on the perforated panels, allows you to install filter bags with composite frames on the perforated panels from the side of the cleaned chamber air. This frees up the design of the main dust collection chamber from:

- side service doors along the entire length of the chamber;

- sealing cords around the perimeter of the side service doors.

Simplification of the design of the main dust collection chamber allows to further reduce the metal consumption, specific gravity and cost of the filter.

2. Supplying the filter with an inlet dust settling chamber having two nozzles for connecting inlet pipelines of polluted air makes it possible to reduce two inlet pipelines compared to the prototype filter with its productivity L _f = 40,000 m ³ / h, which reduces the metal consumption, specific gravity and prime cost of the filter.

3. Installing additional perforated panels vertically in two rows and placing them perpendicular to the end walls of the filter with the formation in the spaces between the rows of additional perforated panels of the chamber of additional purified air and two chambers of additional dust collection located on both sides of the filter allows you to create a filter of different capacities by changing the length of the module additional air purification without transverse partitions, which reduces the specific gravity and cost of construction various filter sizes.

4. The formation of a service corridor between vertically mounted additional perforated panels in the chamber of additional purified air, as well as horizontal installation of filter cartridges in the chambers of additional dust collection from the side of the chamber of additional purified air, make it possible to replace side service doors along the entire length of the chambers of additional dust collection that take place in the filter prototype, on one service door at the end of the chamber of additionally purified air and eliminate sealing Nura along the entire perimeter of the side service doors, which reduces metal consumption, weight, and cost of the claimed filter.

5. Installing an additional air purification module under the cleaned air chamber and supplying the additionally cleaned air chamber with a ceiling panel allows you to create a transit service passage in the purified air chamber on the ceiling panel and connect it to the service passage between the open ends of the filter bags. The presence of a transit service passage to the filter bags in the cleaned air chamber is an indispensable condition for ensuring the replacement of a large number of side service doors in the main dust-collecting chambers of the prototype filter with one service door in the cleaned air chamber, which reduces the metal consumption, specific gravity and cost of the filter.

6. Placement of filter cartridges in two additional dust collection chambers with individual bins and an additional purified air chamber between the additional dust collection chambers allows you to open the bottom of the additional purified air chamber from below and connect exhaust pipes for additional purified air to it, which reduces the length of vertical ducts connecting the exhaust branch pipes with a collector of an output of additionally purified air and, as a result, a decrease in specific ca and filter cost.

7. Flange mounting of filter cartridges on additional perforated panels with putting cartridge bottoms on cylindrical support rods cantilever mounted on the inner surface of the outer walls of the additional dust collection chambers, with the formation of additional cartridge supports on cantilever mounted cylindrical rods, provides reliable frameless two-support mounting of each cartridge, which in comparison with the frame mount of horizontally located cartridges having a month about in the design of Donaldson, and attaching cartridges to a horizontally located, which takes place in Sovplim filters, as well as attaching cartridges to a vertically arranged stud-rod, which takes place in the prototype filter, reduces the metal consumption and the cost of attaching cartridges and, as a result, reduces the cost of the filter.

8. The introduction of unloading devices in the main and additional bins allows you to increase the length of the bins and, as a result, the length of the main and additional dust collection chambers, and place all filter bags and filter cartridges in them in 4 filter prototype modules.

This allows, in comparison with the prototype filter having 4 modules:

a) replace:

- 4 additional dust collection chambers for 2 cameras;

- 4 chambers of additionally purified air per 1 chamber;

- 4 centrifugal fans per fan.

b) reduce:

- 5 gateway unloaders with electromechanical drives;

- 3 chain scraper conveyors with electromechanical drives;

- 3 fire retardant valves;

- 3 fire extinguishing systems.

9. Placing the automatic gateway unloaders of the main and additional bunkers on one line perpendicular to the longitudinal axis of the filter makes it possible to reduce three closed-chain conveyor conveyors of the Grain-Wood production with a total length of 39 m compared to the prototype filter having 4 modules and three electromechanical drives, which reduces the specific gravity and cost of the filter

10. Separation of the height of the main dust collecting chamber by a flange connector with the formation of the upper and lower parts of the chamber, the last of which is rigidly attached to the main hopper, which ensures the transport dimensions of the welded sections, allows filtering bags to be 2.8 m long, which reduces the length of the main dust collecting chamber, the number of sleeves with cuffs and venturi tubes and the length of expensive perforated panels and, as a result, reduces the specific gravity and cost of the filter.

The technical result, which consists in increasing the service life of a set of filter bags and cartridges in the filter, is provided by the following advantages of the proposed solution over the prototype:

1. The filter has less abrasive wear on the filter bags.

2. The filter has less wear on the filter cartridges that occurs when they are regenerated by a compressed air pulse.

Less abrasive wear of the filtering sleeves in the claimed solution is provided due to:

a) replacing the direct supply of contaminated air to the main dust collection chambers of the two-stage air purification modules in the prototype filter by supplying contaminated air to the inlet dust precipitation chamber;

b) performing a window in the front end wall of the main dust collection chamber, increasing the area of contaminated air exit from the dust settling chamber by 55% and ensuring the supply of contaminated air to the filter bags in two streams with a reduced speed.

In this case, the contaminated air flows coming out of the dust chamber have the following percentage ratio:

- ~ 35% of the contaminated air enters the filter bags through a window in the front wall of the main dust collection chamber and then evenly distributed over the entire height of the filter bags through the gap between the sections of the filter bags;

- ~ 65% of the polluted air enters the filter bags in the outgoing air stream from the hopper part of the filter, which, having a low speed, does not prevent dust from settling during the regeneration of the filter bags.

The introduction of a dust chamber with an additional window for the exit of contaminated air reduces the speed of air flow when approaching the filter bags compared to the direct inlet of the contaminated air stream in the prototype filter from (13 ÷ 16) m / s to 2.4 m / s, which reduces the abrasive wear of the filter bags increases the service life of the filter bag set from 1.5 to 3 years, i.e. 2 times.

Less wear of the filter cartridges during their regeneration by a pulse of compressed air in the claimed solution is ensured by replacing the general system for regenerating the filter bags and cartridges in the prototype filter with individual systems and introducing an orderly regeneration of filter cartridges from individual receivers, which allowed, in accordance with the information given on page .61-62 calculation example, reduce the number of regeneration cycles of filter cartridges from 10 to 1 per hour, i.e. 10 times.

The reduced by 10 times the number of cycles of regeneration of filter cartridges in the claimed solution compared to the filter prototype provides an increase in the service life of a set of filter cartridges from 1 year to 5 years, i.e. 5 times. Obtaining these advantages is carried out due to technical solution 2.

The inventive filter, in addition to reducing energy consumption, can reduce the following operating costs:

a) for the purchase and replacement of sealing cords in service doors compared to the prototype filter having 4 modules by installing filter bags and frames for them at their workplaces from the cleaned air chamber due to the presence of a service passage in the cleaned air chamber on the main perforated panels, which reduces the number of main dust collection chambers and the number of service doors in them by 4 times. In this case, the large side service doors in the main dust collecting chambers of the prototype filter are replaced with one small end door into the cleaned air chamber and the length of the sealing cords to the service doors is reduced by 14 times.

b) during installation and dismantling of filter bags due to the presence in the chamber of cleaned air of a service passage on perforated panels between the open ends of the filter bags of both bag sections.

c) during installation and dismantling of filter cartridges during their maintenance due to the horizontal arrangement of filter cartridges and their double support (flange mounting on vertically mounted additional perforated panels from the camera side of additional purified air and putting cartridge bottoms on cylindrical rods mounted on a cantilever inner surface the outer walls of the chambers of additional dust collection). This design of the installation of filter cartridges provides free access to all the mounting flanges of the filter cartridges from the side of the chamber of additionally purified air.

If it is necessary to dismantle any filter cartridge, the compressed-air transfer tube of the vertical row of cartridges in which the dismountable cartridge is located is released from the fastening clamps and laid aside. After that, the filter cartridge is freed from flange mounting with screws and fixing its bottom with a wing nut and is removed from the hole of additional perforated panels. The length of the filter cartridges should be less than the width of the chamber of additionally purified air ≈ 120 mm.

-образных панелей.The design of the inventive bag-and-cartridge filter is illustrated by the drawings in figures 1-19. Figure 1 presents a front view of the filter, its vertical projection; figure 2 is a section aa (figure 1); figure 3 is a section bb (figure 2); figure 4 - section CC (figure 2); figure 5 - section DD (figure 2); figure 6 is a view A (figure 1); Fig.7 is a view of B (Fig.1); Fig.8 is a section EE (Fig.6); figure 9 is a section FJ (figure 2); figure 10 is a section ZZ (figure 3); figure 11 is a section II (figure 3); on Fig - section KK (Fig.8); on Fig - section LL (Fig.12); on Fig - section MM (Fig); on Fig - section HN (Fig.14); in Fig.16 is a section bb (in Fig.2) for the docking module 85; on Fig - the bottom of the cartridge, dressed with a Central hole on the supporting rod through the mounting cylindrical guide; in Fig.18 - section PP (in Fig.2); on Fig - General view

-shaped panels.

In figure 2, 5, 7 conventionally not shown gable visors 32.

In figure 2, 4, 5, 6, 7, the arrows indicate:

The filter (Fig. 3) contains an inlet dust settling chamber for introducing polluted air 1 with an inlet 2, a main dust collection chamber 3, provided with perforated panels 4 at the top and vertically arranged frame filter sleeves 5, fixed with their upper open ends on the perforated panels 4 with double spring rings 84, sewn into the cuffs of the filtering sleeves 5, and containing inside the composite steel wire frames 6 with Venturi tubes 7 for supplying pulses of compressed air (Fig.9). The filter also contains a purified air chamber 8 (Fig. 3), an additional air purification module 9 (Fig. 5, 1), containing two additional dust collection chambers 10 (Fig. 5) and an additional purified air chamber 11 located between them with exhaust pipes 12 for additionally purified air. The nozzles 12 (Fig. 3) are connected to the suction nozzle of the centrifugal fan 67 by means of a collector for outputting additionally purified air 66, which is connected to the nozzles 12 through vertical ducts 80 (Fig. 8).

The filter bags 5 (Fig. 4) are placed in the main dust collection chamber 3 by two bag sections 13 with an interval between them 14, forming a service passage 15 in the chamber of purified air 8 on the perforated panels 4 for servicing the filter bags.

Under the main dust collection chamber 3 (Fig. 3), a main hopper 16 is installed, comprising a discharge device 17, a gate 18 located in the dust outlet 19, and an automatic (lock) gate 20 mounted under the gate 18.

The input dust-settling chamber for introducing polluted air 1 (Fig. 3) is connected to the front end wall 21 of the main dust-collecting chamber 3.

In the front end wall 21 (Fig. 3), a window 22 (Fig. 4) is made for an additional outlet of contaminated air from the inlet dust chamber 1 with dimensions having a height equal to the length of the filter bags 5 and a width equal to the width of the gap between the sleeve sections 13 The module of additionally purified air 9 (Fig. 1) is installed under the chamber of purified air 8 (Fig. 3) and from the side of the rear end wall 23 of the main dust collecting chamber 3. The module of additionally purified air 9 contains two rows of vertically mounted additional x perforated panels 24 (FIG. 5) for attaching filter cartridges 25. Filter cartridges 25 are arranged in sections 26 in two additional dust collection chambers 10 (FIG. 5), between which an additional purified air chamber 11 is located. Chamber 11 (FIG. 5) ) formed along the transverse perimeter:

- on the sides with additional perforated panels 24;

- bottom bottom 27;

- on top of the ceiling panel 28.

The camera 11 is limited from the ends:

- the rear end wall 23 of the main dust collecting chamber 3;

- service door 75.

On the ceiling panel 28 from the side of the cleaned air chamber 8, fences with rails 29 (Fig. 5) are installed with the formation of a transit service passage 30 (Fig. 2) to the filtering sleeves 5.

The filter cartridges 25 (Fig. 5) have a central hole 91 in their bottoms, are made with a support mounting flange, are placed horizontally in the additional dust collection chambers 10 and installed together with the Venturi tubes 31 on the vertical additional perforated panels 24 from the side of the additional purified air chamber 11 s with the help of flange fastening and putting on the bottom of the cartridges with the hole 91 on the cylindrical supporting rods 90, console mounted on the inner surface of the outer walls 82 of the chambers flax dust collection 10 with the formation of additional supports of the cartridges (Fig) on the console mounted cylindrical rods 90 having a stepped threaded surface at the free ends with threads of large 92 and small 93 diameters, providing screwing on the small diameter thread 93 of the mounting cylindrical guide 94 through the sleeve 95 with internal thread for putting on the bottoms 98 of the cartridges 25 and inserting bottoms on the threads of a large diameter 92 with the installation of fixing nuts 96 with sealing washers 97 pos le screwing the mounting rail and the formation of tight joints washers 97 with bottoms 98 cartridges 25.

The fastening of each cartridge 25 is carried out in the following sequence. A mounting cylindrical guide 94 with a threaded sleeve 95 at the end is inserted into the hole for the cartridge 25 on the additional perforated panel 24, which is screwed onto the small diameter thread 93 (M8) on the cantilever mounted cylindrical rod 90. Then, the bottom 98 of the cartridge is put on the free end of the mounting guide 94 , which is manually moved to the side of the cantilever mounted supporting rod 90 with the bottom 98 inserted onto the large-diameter thread 92 (M12). After that, the mounting cylindrical guide 94 with the threaded sleeve 95 is screwed from the thread of small diameter 93 (M8) and removed from the cartridge 25 into which the wing nut 96 with the sealing washer 97 are inserted. In this case, the wing nut 96 is screwed onto the thread of large diameter 92 (M l2). Then, the venturi 31 is flanged together with the cartridge 25 on the perforated panel 24.

After that, mounting tightening of the wing nut 96 through the sealing washer 97 is carried out with the formation of the tight connection "nut-wing-sealing washer-bottom of the cartridge".

The additional dust collection chambers 10 (Fig. 5) have a direct upper inlet of purified air over the entire cross-sectional area of the chambers 10, providing a combination of the downward motion vector of purified air with the vector of natural deposition of falling dust during the regeneration of filter cartridges and a decrease in the hydraulic resistance of the filter ΔP _f (Pa )

In the chambers of additional dust collection 10 (Fig. 8), under the filter cartridges 25 (except for their lower row), gable visors 32 are installed to protect the downstream filter cartridges 25 from dust falling from the top generated during the regeneration of the filter cartridges located in the upper rows.

To mount gable visors 32 in the additional dust collection chambers 10 on additional perforated panels 24 (Figs. 14, 15) and on the outer walls 82 of the chambers 10, under the filter cartridges 25, squares 83 with partially cut shelves are horizontally fixed, the rest of which are cut and bent at an angle equal to the angle of inclination of the slopes of the gable visors 32. Gable visors 32 are attached to the bent part of the horizontal shelves of the angle brackets 83. Each gable visor 32 is fixed to the bent shelves of the coal Cove 83 with four screws. Under the additional dust collection chambers 10 (Fig. 5), additional bunkers 33 are installed, which are equipped with discharge devices 34, and gates 35 (Fig. 6) installed in the dust exhaust openings 36, as well as lock gates 37. In the bottom 27 (Fig. 5) The chambers of additionally purified air 11 are equipped with exhaust pipes 12 for additionally purified air. The inlet openings of the exhaust pipes 12 from the side of the chamber of additionally purified air 11 are closed by intake grilles 38 (FIG. 2).

The sections 13 of the filter bags 5 (Fig. 4) are equipped with individual compressed air regeneration systems 39, each of which contains: a compressed air receiver 40, pulse valves 41 integrated into the compressed air receiver, transit tubes 42 and flexible tubes 43 for supplying compressed air to the filtering sleeves 5, vertically arranged distribution tubes 44 of compressed air through the filtering sleeves 5 through the impulse tubes 45 and clamps 46 for attaching the transfer tubes 44 mounted on perforated panels 4. Compressed air receivers ear 40 placed in the box 47 with hinged lid 48 (Figure 10). Boxes 47 with receivers 40 are mounted on the roof slab 49 of the cleaned air chamber 3, and receivers 40 are connected to the compressed air supply line 99. The hinged lid 48 (Fig. 9) is connected to the box body 47 by means of a piano loop 50, on the hinge of which is used for sealing a strip of sheet rubber 51 is glued. When the compressed air receiver body 40 ruptures, the compressed air in the receiver discards the hinged swivel cover 48, which allows it to be freely released into the atmosphere.

The transit tubes 42 (Fig. 4) for supplying compressed air to the filtering sleeves 5 are connected to the fittings 52 of the pulse valves 41 of the receivers 40. The flexible tubes 43 are designed to divert the transfer tubes 44 to the side of the row of filtering sleeves 5, in which any worn sleeve on a new filter sleeve.

Sections 26 of the filter cartridges 25 (FIG. 5) are equipped with individual regeneration systems 53, each of which contains: a compressed air receiver 54 (FIG. 11), pulse valves 55 integrated in the compressed air receiver, transit tubes 56 (FIG. 5) and flexible tubes 57 for supplying compressed air to the filter cartridges 25, compressed air distribution tubes 58 through the filter cartridges 25 through impulse tubes 59 and clamps 60 for securing the transfer tubes mounted on additional perforated panels 24. Compressed air receivers 54 (Fig. 11) crated in boxes 62 with hinged lids 63. Boxes 62 (FIG. 3) with receivers 54 are mounted on the roof slab 49 of the cleaned air chamber 8, and the receivers 54 are connected to the compressed air supply line 99. Transit tubes 56 (FIG. 11) for supplying compressed air to the filter cartridges 25 are connected to fittings 61 of the pulse valves 55 of the receivers 54. The main dust chamber 3 and the cleaned air chamber 8 located above the additional dust collection chambers 10 are equipped with safety doors 64 and 65 (Fig. 1). The discharge pipe of the centrifugal fan 67 (Fig.6) is connected to a recirculation duct 68, which is equipped with fire-retardant valves 69, 70 (Fig.6). In this case, the fire retardant valve 69 is normally open and the valve 70 is normally closed. At the outlet of the valve 70, a square tap 71 is installed, turned downward by an open hole 72, and communicating with the atmosphere. In the event of a fire, the fire retardant valve 69 closes and the valve 70 opens, allowing air to escape from the filter by the fan 67 through the opening 72 of the exhaust 71 to the atmosphere. Recirculation duct 68 (Fig.6) is equipped with a throttle valve 73 for output of the centrifugal fan 67 to the calculated mode.

The chamber of purified 3 (FIG. 3) and additionally purified air 11, as well as the main hopper 16 are provided with service doors 74, 75 (FIG. 6) and 76 (FIG. 3). The entrance to the chambers of purified and additionally purified air is carried out from sites 77, 78 (Fig. 3). For the safety of servicing pulse valves 41, 55 of compressed air receivers 40, 54, fences with railing 79 are installed on the roof floor 49 of the cleaned air chamber 3 (FIG. 6). Unloading of captured dust by filtering sleeves 5 and cartridges 25 from the main 16 and additional 33 bins (Fig.6) is carried out by unloading devices 17, 34 through the lock gates 20, 37 (Fig.5) into a chain-type scraper conveyor of closed type 81 manufactured by Grain Wood ".

The filter housing can be made in two versions:

- from panels with a width of 575 mm, transported in a container and assembled into the product using fastening bolts at the installation site of the filter;

- from welded sections manufactured at the manufacturer, transported by road to the installation site.

When the customer's location of the filter at a large distance from the manufacturer of the filter, the latter is made from prefabricated panels 575 mm wide, and when the customer is located at a short distance - from welded sections.

The additional air purification module 9 is installed:

- in the manufacture of welded sections adjacent to the rear end wall 23 of the main dust collecting chamber 3 (figure 3), while the wall 23 is common (dividing);

- in the manufacture of prefabricated panels with a width of B = 575 mm with a gap between the end wall of the module and the rear end wall 23 of the main dust collecting chamber 3, equal to _Bin = 2 × 575 = 1150 mm (not shown in the drawings).

An additional air purification module can also be installed on the side of the front end wall of the inlet dust chamber (not shown in the drawings). In this case, the inlet dust shrink chamber should be installed under the purified air chamber 8. Considering two possible options for manufacturing the module for additional air purification (1 - from welded sections; 2 - from panels 575 mm wide) and two options for installing the module (1 - from the rear end walls 23 of the main dust collecting chamber 3; 2 - from the front end wall of the inlet dust settling chamber), in the characterizing part of the claims the general sign of the installation of the module is indicated: the module for additional air purification is installed under measure cleaned air from any of the end wall of the filter.

To facilitate the docking of the module for additional air purification 9 with the main dust-collecting chamber 3 and the purified air chamber 8, a filter module 85 is provided in the filter design (Fig. 16), which is manufactured at the factory, which consists of four sections mounted on top of one another:

- support section 86 of the docking module;

- hopper section 87 of the docking module;

- sleeve-cartridge section 88 of the docking module;

- section of the purified air chamber 89 of the docking module.

The supporting section of the docking module has dimensions l × b × h = 2400 × 2875 × 1900 mm.

The hopper section 87 of the docking module contains one section from the main hopper and two additional hoppers and has dimensions l × b × h = 2400 × 2875 × 2400 mm.

The sleeve-cartridge section 88 of the docking module contains three rows of filter bags 5, a dividing wall, which is the rear end wall 23 of the main dust collecting chamber 3, three vertical rows of filter cartridges 25, the end section of the additional purified air chamber 11 and has dimensions 2400 × 2875 × 2400 mm

The section of the cleaned air chamber 8 of the docking module has dimensions l × b × h = 2400 × 2875 × 1800 mm.

The exhaust pipe 12 in Fig.16 is installed when mounting the docking module 85 at the enterprise customer of the filter.

All four sections of Docking Module 85 have two common sizes:

- b = 2875 mm - filter width size;

- l = 2400 mm - the length of the docking module.

All sections 86, 87, 88, 89 of the docking module 85 are subjected to control assembly with the installation of control pins in the connecting flanges and marking of the sections at the factory.

To ensure fire safety, the filter is equipped with standard systems:

- filter grounding;

- prevention of dust accumulation in filter hoppers;

- detection of dust fire in the filter and fire fighting;

- fire retention in the event of a fire in the filter to prevent fire from entering the air distributor installed in the workshop and transport pipelines.

The aforementioned fire safety systems in the filter are not considered in the claimed solution.

The bag filter can operate in three modes:

1. All sections 13 (figure 4) of the filter bags 5 and sections 26 (figure 5) of the filter cartridges 25 are in the filtering mode.

2. Regular regeneration of the filter bags 5 in each bag section 13 (Fig. 3) is carried out by applying a pulse of compressed air from pulse valves 41 integrated into the receivers 40 of sections 13, filter bags 5 through transit 42, flexible 43, transfer 44 and pulse 45 tube (figure 4).

3. Regular regeneration of the filter cartridges 25 is carried out, located in each additional dust collection chamber 10 (Fig. 5) by applying a pulse of compressed air from pulse valves 55 integrated into the receivers 54 of sections 26 of the filter cartridges 25 through transit 56, flexible 57, vertically mounted transfer cases 58 and pulse 59 tubes.

Modes 1, 2 and 3 are carried out with round-the-clock air purification, i.e. with working technological equipment. After the filter is brought to the equilibrium dusty state of the filter cloths of the filtering sleeves 5 and cartridges 25, the filter is turned on for continuous round-the-clock air purification.

This includes:

- time relay (not indicated in the drawings) for the implementation of air filtration by filtering sleeves 5;

- a timer for limiting the time of the dust accumulation cycle in sections 26 of the filter cartridges 25 (not indicated in the drawings).

Sequential sequential regeneration of the filter bags 5 and cartridges 25 is carried out by the control controller (not indicated in the drawings).

The filter in the filtering mode (figure 3) works as follows. Contaminated air containing explosive dust and to be cleaned from the inlet pipes 2 enters the upper part of the inlet chamber 1, which acts as a dust chamber. The polluted air in chamber 1 is divided into 2 streams:

- part of the polluted air (≈35%) enters the window 22 (figure 4), from which it is sent to the gap 14 between the sections 13 of the filter bags 5 and distributed over their entire height;

- the rest of the polluted air (≈65%) goes down and enters the main hopper 16 and then into the main dust collecting chamber 3, in which vertically mounted frame arms 5 with an external working surface are placed.

When this dust particles larger than 150 microns are separated from the air in the inlet chamber 1 and fall in the main hopper 16 of the filter. Air dusted with small particles with sizes less than 150 microns enters the area of the filter bags 5. At the same time, the contaminated air passes through the fabric of the filter bags throughout their height, is cleaned in them and flows through the open part of the bags 5 into the cleaned air chamber 8.

Since the filtering sleeves 5 are made of glazed polyester, which does not hold the dust layer on its working surface, the dust flows from the working surface of the sleeves 5 and is deposited in the main hopper 16, from which it is removed by the discharge device 17 (auger conveyor) through the dust outlet 19 and the lock the shutter 20 to the closed-type scraper chain conveyor 81, which transfers dust to the storage container (not indicated in the drawings). A small part of the dust remains inside the filter fabric of the sleeves 5.

In the filtration mode, the pulse valves 41 integrated into the compressed air receivers 40 sections 13 of the filter bags 5 are closed.

Purified in sections 13 of the filter bags 5 air containing particles smaller than 10 microns in size, from the chamber 8 flows in two streams to the additional air purification module 9. At the same time, streams of purified air enter the additional dust collection chambers 10 and pass through sections 26 of the filter cartridges 25 into the chamber additionally purified air 11. From the chamber 11, additionally purified air leaves through the exhaust pipes 12 into the vertical ducts 80 and then into the output manifold of the additionally purified air 66, which is connected suction side of the centrifugal fan 67. The fan 67 takes the further cleaned air to the recirculation duct 68. In this case, valve 69 is open flame retardant, flame retardant and the valve 70 is closed. From the recirculation duct 68, additionally purified air enters the air distributor installed in the production room (not shown in the drawings). The filtering sleeves 5 of the main dust collecting chamber 3 will be in the filtering mode, the estimated time controlled by the time relay, after the triggering of which the regeneration mode of the sleeves 5 starts. The duration of the filtration mode, characterizing the length of the interval between regeneration periods, depends on the value of the initial concentration of wood dust С _n , mg / m in the nozzles of polluted air 2 and is installed on a time relay. For the workshops of white grinding C _n = 3000 mg / m ³ , and for the workshops of grinding plywood C _n = 6950 mg / m.

The second mode of regeneration of the filter bags (cleaning critically dusty fabric of the bags from dust to an equilibrium dust state) is carried out by sequentially blowing the rows of filter bags 5 with a pulse of compressed air at the beginning of one section 13 and then another section 13 of the filter bags 5 of the main dust collecting chamber 3. Regeneration of the filter bags 5 starts after the time relay is triggered and is carried out through the controller (not shown in the drawings), which controls the pulse switching sequence x valves 41. The dust blown from the filter bags 5 is poured into the main hopper 16, from which it is removed through the dust outlet 19 and the lock gate 20 into the closed chain scraper conveyor 81 by the discharge device 17. After the regeneration of both sections 13 of the filter bags 5 is completed, the control controller includes time relay for filtering mode.

Alternately purging the filter bags 5 at the beginning of one bag section 13 through the pulse valves 41 and then the other bag section reduces the air load on the filter bags in the regeneration mode, reduces the energy consumption for air cleaning and increases the cleaning efficiency E,%, in the bags by reducing the filtration rate V _f , m / s.

The third mode of regeneration of the sections 26 of the filter cartridges 25 by a pulse of compressed air can be illustrated by the example of figure 4. The operation of the regeneration system of the sections of the filter cartridges 25 starts when the timer limits the time of the dust accumulation cycle on the filter cartridges 25 and is reduced to the sequential regeneration of the vertical rows of filter cartridges 25 first in one and then in another chamber for additional dust collection 10. Blown from the filter cartridges by 25 pulses of compressed air dust settles in additional bins 33 and is removed from them by additional unloading devices 34 (screw conveyors) through the exhaust openings 36 and sluice gates 37 into the closed chain scraper conveyor 81.

Shown in figures 1-19 filter bag-cartridge for air purification from mechanical impurities has a capacity L _f = 45000 m ³ / h and is made of welded sections with a capacity L _c = 10000 m ³ / h

The following data were taken as initial data for calculating the parameters of the welded sections of the indicated productivity: inner diameter of the filter bag d _int = 150 mm, thickness of the filter cloth S _tk = 2 mm, length of the filter bag l _p = 2.82 m, filtering speed in the sleeves in the filtration mode V _f = 2 m / min. The number of hoses in the blown row n _p = 10, the number of hoses blown through one receiver 40 n _p = 5. The number of hoses in one sleeve section transported by motor vehicles with a capacity of L _c = 10000 m ³ / h, n _pc = 60 hoses.

In the module for additional air purification, filter cartridges are used with an outer diameter d _kn = 0.36 m, a length l _k = 0.8 m, a corrugation pitch t _g = 10 mm, a corrugation height h _g = 50 mm, having a filter speed V _f = 1 m / min productivity L _to = 500 m ³ / h The number of filter cartridges in the vertical row of the cartridge section is n _q = 5. Performance blown vertical row of filter cartridges L _ave = n · L _{CWR k} = 5 × 500 = 2500 m ³ / h.

The number of filter cartridges in the docking module n _kmod = 26.

The number of filter bags in the docking module n _rmod = 30.

The number of cartridges in one welded section of an additional air purification module with a capacity of L _c = 10000 m ³ / h, n _ks = 10000/500 = 20 cartridges.

Based on the given initial data, the following parameters were obtained.

1. The filtering area of one sleeve with a bottom

.

.

2. The filtering area of one section of the sleeves with a capacity of L _c = 10000 m ³ / h

F _cp = n _cf. F _pi = 60 · 1.3804 = 82.82 m ² .

3. The filtering area of one row of sleeves

_Fpred = 10F _pi = 10 · 1,3804 = 13,804 m ² .

4. Actual air flow at L _f = 2 m / min:

- one row of filter bags

L _row = F _row · V _f = 13,804 · 2,0 = 27,608 m ³ / min = 1656,48 m ³ / h .;

- one section with a capacity of L _c = 10000 m ³ / h

L _c = F _av · V _f = 82.82 · 2.0 = 165.64 m ³ / min = 9938 m ³ / h.

5. The number of rows of filter bags in the filter with a capacity of L _f = 45000 m ³ / h

n _row = L _f / L _row = 45000 / 1656.48 = 27.19 rows.

Accepted n _row = 27.

6. The number of sleeves in the filter

n _p = n p. _row · n _row = 10 · 27 = 270 sleeves.

7. The length of the main dust collection chamber with a productivity of L _f = 45000 m ³ / h

l _opt = l _s3 + 4l _s6 = 920 + 4 · 1350 = 6320 mm,

where l _c3 is the length of the section with three rows of filter bags located in the connecting sleeve-cartridge section, mm; l _c6 - the length of the section with six rows of filter bags, mm.

8. Width of filter and module for additional air purification

B _f = 5 · 575 = 2875 mm.

9. Width of the chamber for additional dust collection

In _cdp = l _to + 100 = 800 + 100 = 900 mm.

10. The width of the chamber additionally purified air

In _{kdov VF} = -2V _KDP · 900 = 2875-2 = 1075 mm.

11. The length of the module for additional air purification with a capacity of L _mod = 45000 m ³ / h:

l _mod = l _{c (15000)} + 3l _{s (10000)} = 1480 + 3 · 1020 = 4540 mm,

where l _{c (15000)} is the length of the cartridge section with a productivity of L _c = 15000 m ³ / h, located in the docking sleeve-cartridge section, mm; l _{s (10000)} is the length of the section of the module for additional air purification with a productivity L _c = 10000 m ³ / h, mm.

12. The length of the input dust chamber

l _pc = 2 · 575 = 1150 mm.

13. The total length of the filter with a capacity of L _f = 45000 m ³ / h

L _fΣ = l _pc + l _cpr + l _mod = 1150 + 6320 + 4540 = 12010 mm.

The filter has electrical locks, according to which:

- during the regeneration of the filtering sleeves 5 cannot be started regeneration of the filtering cartridges 25;

- after the regeneration of the next vertical row of filter cartridges, the regeneration of the next row of cartridges can begin only after dust has been deposited in the hopper from the previous row of filter cartridges, the time of which is controlled by a time relay.

The time limit for the dust accumulation cycle T _pnc , h, in the filter cartridge sections, set on the timer, depends on the dust accumulation value M _p , kg, in the vertical rows of the filter cartridges and is determined from the explosion safety condition for an orderly blowing of the cartridges.

where [C _n ] is the permissible concentration of dust in polluted air obtained after pulsed purge, mg / m ³ ; [M _p ] is the mass of dust accumulated by the NKPV in the vertical row of filter cartridges, kg. The vertical row consists of 5 cartridges; V _to is the critical volume of air in which, after pulsed purging of the vertical row of filtering cartridges, the highest dust concentration, m ³ , takes place from expression (3); NKPV - lower concentration limit of explosiveness for wood dust, g / m ³ , NKPV = 12.6 - for wood flour; K _s - safety factor for preventing the explosion of the dusty air mixture during the regeneration of the vertical row of cartridges with a probable spark breakthrough, K _s = 1.2 ÷ 1.5.

From (1)

where L _P - air flow rate in one vertical row of filter cartridges, m ³ / h,

where L _c = 10000 - the performance of the filter section, m ³ / h; n _p - the number of vertical rows of filter cartridges in the section of the module additional cleaning; T _to - the critical time during which there is a subsidence discharged during the regeneration of the vertical row of dust cartridges in a vertical downward air flow, sec.

After substituting (3) in (2) we obtain

The dust accumulation time in the vertical row of cartridges T _PNA , s, is determined from the expression

where M _p - the mass of dust deposited in the vertical row of cartridges as a result of filtering the flow of purified air, kg / h

where c_nk - the initial concentration of dust at the entrance to the vertical row of filter cartridges, mg / m³, FROM_nk= 3; FROM_kk - final dust concentration at the outlet of the module for additional air purification, mg / m³, FROM_kk= 0.05.

After substituting (5) and (7) in (6), we finally obtain the formula for determining the dust accumulation time in the vertical row of cartridges.

Calculation of dust accumulation time in sections of filter cartridges.

Example: L _f = 25000 m ³ / h = 6.944 m ³ / s, l _k = 0.8 m, n _k = 46, n _hardly = 10; L _kdpu = L _mod = 2.5 m, V _kdpu = 0.9 m, C _nk = 3 mg / m ³ , C _k = 0.05 mg / m ³ .

1. The cross-sectional area of the two additional dust collection chambers without filter cartridges.

F _KDPU = L _KDPU · 2B _KDPU = 2.5 · 2 · 0.9 = 4.5 m ² .

2. The cross-sectional area of the cartridges of the first upper row

F _kΣ = n _kvr · l _k · d _k = 10 · 0.8 · 0.36 = 2.88 m ² .

3. The area of the passage of purified air between the cartridges of the upper row of the module

F _overf = F _cdpu- F to _Σ = 4.5-2.88 = 1.62 m ² .

4. The flow of purified air through half of the upper row of cartridges

L _0.5wrc = 0.5L _ki · n _kvr = 0.5 · 500 · 10 = 2500 m ³ / h = 0.694 m ³ / s.

5. The flow of purified air through the passage of the upper row of cartridges

L ₅ = L _f -L _0.5wrk = 6.944-0.694 = 6.25 m ³ / s.

6. The speed of the cleaned air when going down to the additional bins:

- through the top row of cartridges

V _ov5 = L ₅ / F _ovr = 6.25 / 1.62 = 3.85 m / s;

- through the bottom row of cartridges

V _ov1 = L _0.5.1 / F _ovr = 0.694 / 1.62 = 0.428 m / s;

- average air speed

V _cf. = 0.5 (V _ov5 + V _ov1 ) = 0.5 (3.85 + 0.428) = 2.139 m / s.

7. The transit time of the dust dropped from the vertical row of cartridges T _k (s) to the additional hopper at l _pr = 2.4-0.1 = 2.3 m

T _a = V _cp / l _ave = 2.139 / 2.3 = 0.93 seconds.

8. Dust accumulation time in the cartridge section

From the above example, it follows that to ensure explosion-safe purging of the filter cartridges, the regeneration of the rows of cartridges must be carried out once an hour. The specified time is set on the timer.

Table 1 shows the parameters of the line of bag-and-cartridge filters of various capacities, and in Table 2 the parameters L _f , F _f , V _f in the filtering modes of bags and cartridges.

table 2 Filter parameters L _f , F _f , V _f in the filtering modes of the sleeves and cartridges Filter index Filtering modes Sleeveless Cartridges L _f , m ³ / h
(m ³ / min) F _fΣ , m ² V _f
(m / min) L _f , m ³ / h (m ³ / min) F _fΣ , m ² V _f
(m / min) SUPER FILTER-15000-90-26-I-
A-VZ-N 15000 (250) 125.0 2.0 15000 (250) 235 1.06 SUPER FILTER-25000-150-46-
I-A-VZ-N 25000 (416.6) 208.3 2.0 25000 (416.6) 415.8 1,0 SUPER FILTER-35000-210-66-
I-A-VZ-N 35000 (583.3) 291.6 2.0 35000 (583.3) 596.6 0.98 SUPER FILTER-45000-270-86-
I-A-VZ-N 45000 (750) 375 2.0 45000 (750) 777.4 0.96 SUPER FILTER-50000-300-92-
I-A-VZ-N 50,000 (833.3) 416.6 2.0 50,000 (833.3) 831.6 1,0 SUPER FILTER-70000-420-132-
I-A-VZ-N 70,000 (1,166.6) 583.3 2.0 70,000 (1,166.6) 1193.3 0.98 SUPER FILTER-90000-540-172-
I-A-VZ-N 90,000 (1,500) 750 2.0 90,000 (1,500) 1554.8 0.96

The following is the indexing of the filter designation

An example of a filter designation with a capacity of L _f = 25000 m ³ / h SUPER-FILTER-25000-150-26-I-A-VZ-N.

All of the above, including a description of the operation of the filter, confirms the possibility of its use in industry with obtaining high technical performance compared with the known filter designs. In addition, both in the sources of patent and scientific and technical information, and in industry, such a design did not occur, which indicates that the proposed solution meets the criteria of the invention.

Claims (3)

1. A bag-and-cartridge filter for purifying air from mechanical impurities, containing a main dust collecting chamber equipped with perforated panels in the upper part and vertically arranged frame filtering sleeves fixed with upper open ends on perforated panels, a cleaned air chamber, a main hopper with an automatic shutter at the exit from the dust outlet, located under the main dust collection chamber, at least one inlet pipe for the input of contaminated air , an additional air purification module, comprising an additional dust collection chamber with additional perforated panels and filter cartridges having a central hole in the bottoms and mounted on additional perforated panels, an additional purified air chamber with an outlet pipe for additional purified air, an additional hopper with an automatic shutter at the exit from the dust outlet, located under the chamber for additional dust collection, phy regeneration system exhaust sleeves and cartridges with a pulse of compressed air, which includes a receiver of compressed air and transfer tubes connected to it via pulse valve blocks, located in the chambers of cleaned and additionally cleaned air and equipped with pulse tubes, which are located opposite the outlet openings of the filtering sleeves and cartridges, characterized in that the filter bags are placed in the main dust collecting chamber by two bag sections with a gap between them, forming in the chamber of purified air on perforated panels, a service passage between the open ends of the filter bags of both hose sections, the filter is equipped with an inlet dust chamber adjacent to the front end wall of the main dust collection chamber, which is made with a window in the front end wall located opposite the gap between the sections of the filter bags, an additional air purification module installed under the chamber of cleaned air from the side of the rear end wall of the main dust chamber of the bag filter and is equipped with a second an additional dust collection chamber with an individual additional hopper and an automatic shutter at the outlet of the dust outlet, at least one additional exhaust pipe for additional purified air, a collector for output of additional purified air and vertical ducts connected at one end to the exhaust pipes for additional purified air, and the other end with the collector output additionally purified air, additional perforated panels for mounting The filter cartridges are installed in the additional air purification module vertically in two parallel rows with a gap between them and perpendicular to the end walls of the filter with additional cleaned air in the space between the rows of additional perforated panels, which is made with a service door and equipped with a bottom and a ceiling panel hermetically connected with their sides with additional perforated panels and forming a service corridor inside the chamber, and over chambers are a transit service passage in the cleaned air chamber to the filter bags, additional dust collection chambers are located on both sides of the additional cleaned air chamber and have a direct upper cleaned air inlet over the entire horizontal section of the chambers, and exhaust pipes for additional cleaned air are additionally installed in the chamber bottom purified air, filter cartridges are placed horizontally in sections, which are installed in the chambers of additional dust collection from chambers of additionally purified air and are mounted on additional perforated panels by means of flange mounting and putting on the bottom of the cartridges with holes on the cylindrical supporting rods, cantilever mounted in the center of the bottom of the cartridges on the inner surfaces of the outer walls of the additional dust collection chambers, with the formation of additional cartridge supports on the cantilevered cylindrical rods, having at their free ends a stepped threaded surface with threads of a large and small diameters, providing screwing on a small diameter thread of a mounting cylindrical guide with an internal thread for putting on it the bottoms of cartridges and inserting bottoms on the threads of large diameter with the installation of fastening wing nuts with sealing washers after screwing the mounting rail and the formation of tight joints of washers with bottoms cartridges, sections of filter bags and cartridges are equipped with individual systems of regeneration by a pulse of compressed air with a vertically arranged with compressed air distribution tubes for the regeneration of filter cartridges, in addition, receivers with pulse valves in the regeneration systems of the filter bag sections and cartridges integrated in them are placed in closed boxes with hinged lids that are mounted on the roof of the cleaned air chamber and equipped with transit tubes for supplying compressed air, which are connected to the distribution tubes of compressed air through the filtering sleeves and cartridges through flexible tubes, while m the main and additional bins are equipped with unloading devices, and automatic shutters installed at the outlet of the dust outlets of the bins are located on one line perpendicular to the longitudinal axis of the filter, providing continuous unloading of captured dust from the main and additional bins in one closed chain scraper conveyor. 2. The filter bag-cartridge for air purification from mechanical impurities according to claim 1, characterized in that in the manufacture of a filter from welded sections, the filter is equipped with a docking module for connecting the module for additional air purification with a bag filter containing a support section, a hopper section, a sleeve a cartridge section with a dividing wall and a section of the purified air chamber, mounted one on top of the other and subjected to control assembly with the installation of control pins, while the main dust collecting chamber is divided and in height with a flange connector with the formation of the upper and lower parts of the chamber, the last of which is rigidly attached to the main bunker. 3. The filter bag-cartridge for air purification from mechanical impurities according to claim 1, characterized in that in the manufacture of the filter from panels made in the form according to Fig. 19, assembled into the product by means of bolted fasteners, the additional air purification module is installed with an interval between its end wall and the rear end wall of the main dust collecting chamber and the insertion into the purified air chamber of the connecting section having a width equal to the width of the gap formed.

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