RU2209656C2 - Device for regeneration of cloth filter - Google Patents

Abstract

FIELD: cleaning gases from dust; ferrous and non-ferrous metallurgy; manufacture of building materials; chemical industry. SUBSTANCE: proposed device ensures quick opening and closing of blow valve at minimum interval, high rate of raising pressure, interruption of process of delivery of compressed air to bag filter cleaning system. Proposed device includes blow valve, receiver with branch pipe, dispensing manifold and electromagnetic valve. Blow valve has body provided with spring and larger diaphragm engageable with end of dispensing manifold located in receiver. Branch pipe of receiver is made in form of extended neck with bearing flange. Blow valve is provided with cover having hole, intermediate ring, through-way and relief holes and smaller diaphragm with holes which is mounted between cover and body and is engageable with relief hole of blow valve. Larger diaphragm of blow valve is located between its body and intermediate ring. End of dispensing manifold and larger diaphragm form circular clearance in open position; ratio of area of circular clearance to inner area of section of dispensing manifold is equal to 0,7<d_av•π•H/d $\genfrac{}{}{0ex}{}{\text{2}}{\text{in}}$ •π/4)<1,0, and ratio of area of holes to larger diaphragm and area of circular clearance between end of dispensing manifold and larger diaphragm in closed position is equal to 0,08%<[(d $\genfrac{}{}{0ex}{}{\text{2}}{\text{1}}$ •π/4)•n:(d $\genfrac{}{}{0ex}{}{\text{2}}{\text{diaph}}$ •π/4)]•100%<0,2%, where d_av is average diameter of end of dispensing manifold which is used as seat of blow valve; d_in is inner diameter of dispensing manifold; d₁ is diameter of hole in larger diaphragm; d_diaphis diameter of larger diaphragm; n is number of holes in larger diaphragm; H is height of raise of larger diaphragm with blow valve in open position, π = 3,14.. Area of holes of smaller diaphragm is lesser than area of holes in larger diaphragm by 5-10 times and is lesser than cross section area of electromagnetic valve by 2.5-4 times. Electromagnetic valve is mounted directly on cover of blow valve. EFFECT: enhanced efficiency. 2 dwg

Description

 The invention relates to the purification of gases from dust by fabric filters and can be used in various industries: ferrous and non-ferrous metallurgy, building materials industry, chemical industry, and DR.

A device for the regeneration of a fabric filter / US patent 4033732. IPC ³ 01 D 46/04, publ. 07/05/77 /, which includes the receiver, with purge valves installed on it, dispensing manifolds with nozzles or nozzles for the expiration of pulses of compressed air into the filter elements.

 The regeneration of the filter elements is carried out in this way. When the purge valve is opened, compressed air from the receiver enters the filter through the distributor manifold and flows from the nozzles of the manifold into the filter elements, for example, sleeves, in the direction opposite to the working direction of the gas, and cleans the sleeves of dust particles accumulated on their surface. The nozzles of the distributing manifold are located relative to the filter bags so that the amount of ambient air ejected by the pulse jet into the sleeve is minimal, that is, the regeneration process in this case is carried out by a direct pulse.

 According to the authors of the patent, the maximum regeneration effect is observed as a result of a pressure jump in the sleeve preceding the start of air movement in it, that is, the process of accelerating and decelerating the pressure is more important from the point of view of regeneration than the subsequent air flow along the sleeve.

 Thus, to ensure more efficient regeneration, it is important to create an increased effect of pressure increase in the sleeve, and this acceleration can be created by increasing the energy of the impulse jet emanating from the nozzle of the distributing manifold. The process of sleeve regeneration is based on the fact that the time to reach the maximum pressure pulse should be as short as possible, and the maximum pressure pulse should be as long as possible.

 Achieving this result depends on a number of factors. The potential energy to create a pressure pulse is accumulated in the receiver of a certain volume in the form of compressed air with a pressure of 0.1-0.5 MPa. The transfer of potential energy from the receiver to the energy of the pulse jet at the outlet of the nozzle of the distribution manifold depends on a number of parameters: the air pressure in the receiver, the air pressure loss in the regeneration system, the technical characteristics of the purge valve and, first of all, its speed. Pressure transfer from the dispensing manifold to the sleeve is most effective when the nozzle is located relative to the inlet of the sleeve so as to eject as little ambient air into the sleeve as possible.

 At the same time, the main devices of the regeneration system: the purge valve, the receiver, and the distributor manifold have certain, interdependent, geometric dimensions.

 The most important device in the regeneration system is a purge valve, which provides efficient regeneration with a minimum flow of compressed air. The latter can be achieved by creating a high rate of pressure increase in the sleeve, and as soon as the pressure in the sleeve reaches its maximum value, it is necessary to interrupt this process.

 It is advisable to control the purge valve by electric control pulses. After applying an electrical control pulse, taking into account the delay in opening the valve, the dynamic flow fully develops, which causes an increase in pressure in the filter sleeve to a maximum value. After some time, after the supply of the electrical control pulse has ceased, the valve closes by the interruption of the electrical control pulse. The duration of the electrical control pulse, during which the purge valve remains closed, should be minimal. The purge valve should close as quickly as possible without external influences, which is a design feature of the purge valve. In addition, the design of the valve should include a mode of operation in which the electrical pulse must be interrupted before the maximum pressure in the sleeve is reached. This means that a signal to close the valve must be given before the pressure pulse in the sleeve reaches its maximum. The conclusion from the above is the following: the valve opening and closing times should be short.

 However, there are doubts about the application of certain provisions proposed by the authors of the above device. For example, conducting the regeneration process at a pressure of 0.1 MPa leads to an unjustified increase in the dimensions of the receiver. Our studies showed that when the purge valve is activated, the pressure in the receiver drops by 0.1-0.15 MPa and, accordingly, the working pressure should be at least 0.2 MPa. Landing the purge valve on the receiver, provided that the purge valve seat is located inside the receiver, is structurally possible only if the receiver is made from a square tube, for example, 400x400 mm or 450x450 mm. In the CIS countries, such pipes for the manufacture of receivers are not produced.

 It is necessary to clarify other parameters of the regeneration device, for example, the ratio of the area of the annular gap between the membrane in the open position of the purge valve and the end face of the dispensing manifold to the cross-sectional area of the dispensing manifold, etc.

Closest to the claimed device for regenerating a fabric filter in technical essence and the achieved result is a device for regenerating a fabric filter / M. G. Mazus, A.D. Madgin, M.D. Margulis. Filters for trapping industrial dust. M .: Engineering, 1985, p. 83-87 /. Filters manufactured in the CIS countries, such as FRKI, FRKDI, FRI, etc., are equipped with such devices that provide a short-term supply of a stream of compressed air to each filter element. A regeneration device for such fabric filters includes a receiver on which purge valves d _у = 40 mm are installed for example, 6 pcs. In addition, 3 solenoid valves are included in the tissue filter regeneration device to provide control of purge valve operation. The purge valve is installed on the pipe welded to the receiver and is positioned so that the open end of the dispensing manifold is the seat of the purge valve. When the filter is in operation, the valve is in the closed position. The valve membrane is pressed against the end of the dispensing manifold, which is the seat of the purge valve, and the compressed air through the calibrated holes in the membrane balances the pressure under the membrane and above the membrane. The solenoid valve is closed. Due to the pressure difference in the receiver and the dispensing manifold, the purge valve membrane is firmly pressed against the seat.

 Opening the purge valve is as follows. An electric current is supplied to the solenoid valve, its movable core rises and compressed air is removed from the supmembrane space into the atmosphere. Under the action of excess pressure in the receiver, the membrane moves away from the end of the distributor manifold, and compressed air enters the distributor manifold. After turning off the current, the core of the solenoid valve drops under the action of its own weight and spring, the pressure in the supmembrane space increases and the membrane is tightly pressed to the end of the transfer manifold / seat /.

This device is characterized by such indicators: with the simultaneous operation of two purge valves and a compressed air pressure in the receiver of 0.3 MPa, 55-70 dm ^{3 of} air is supplied through each purge valve. In such designs, air can be supplied to one solenoid valve from two purge valves that open simultaneously. The pulse duration of compressed air is 0.2-0.4 s. The flow rate of compressed air for regeneration through one purge valve per pulse is at least 55 dm ^{3 of} air.

The regeneration device described above is widely used, as mentioned above, in filters with pulse regeneration manufactured by CIS enterprises. Since two valves are activated simultaneously, and in each of them at least 55 dm ^{3 of} compressed air is supplied to the regeneration system, the total compressed air consumption is at least 110 dm ³ , and the pulse duration during regeneration is at least 0.2 s. With such a regeneration system, bag filters have restrictions on the length of the sleeves, as a rule, up to 3 m. To improve the efficiency of regeneration, an ejector is installed at the inlet in each sleeve, and with a sleeve length of more than 3 m, filters with two-sided pulse regeneration are used, but also with the installation of ejectors , which greatly complicates the design of the filter.

The purge valve d _y = 40 mm has one membrane controlled by an electromagnetic valve connected to the purge valve through an impulse tube. According to its characteristics, such a purge valve cannot be used for sleeve regeneration systems without installing an ejector or other similar devices at the inlet to the sleeve.

 Given the above, it can be argued that the main disadvantages of the known device regeneration of the fabric filter is the inability to ensure quick opening and closing of the purge valve with a minimum time interval between opening and closing, and, as a consequence, the inability to provide a high rate of pressure increase in the sleeve and, upon reaching its maximum values, interrupting the process of supplying compressed air to the regeneration of filter elements of the filter. Based on the foregoing, it can be argued that such a device can not be attributed to high-speed. In addition, it is impossible to provide effective control over the operation of such a device.

 Our experimental studies in both experimental and industrial plants have shown that the opening time of the purge valve should not be longer than 10 ms, the closing time of the purge valve should not be longer than 60-70 ms, and the duration of the opening-closing cycle should be less than 100 ms. At the pilot plant, the main filter elements were used, for example, a filter sleeve of 5 m length, a purge valve, a receiver, a life-size dispensing manifold, as on an industrial filter. It was found that with certain ratios of the geometric dimensions of the regeneration devices and the filter bag, as well as the design of the purge valve, the maximum pressure in the filter bag must be provided for no more than 25-30 ms from the start of the purge valve opening. For example, at an overpressure in the receiver of 0.4 MPa, the rate of pressure increase is 1500000 Pa / s, and the pressure drop in the receiver is not more than 0.12 MPa. This indicator provides the regeneration of the sleeve with a pressure drop in the chambers of dirty and clean gas up to 2000-2500 Pa.

 The basis of the claimed invention is the task of creating a tissue filter regeneration device with a high-speed purge valve, providing quick opening and closing of the purge valve with a minimum time interval between them, a high rate of pressure increase in the sleeve and, when it reaches its maximum values, interruption of the compressed air supply in bag filter cleaning system, as well as full and effective control of the opening and closing functions of the purge valve.

а соотношение площади отверстий в большой мембране и площади кольцевого зазора между торцом раздаточного коллектора и большой мембраной в закрытом положении составляет

где d_с - средний диаметр торца раздаточного коллектора, который является седлом продувочного клапана,
d_вн - внутренний диаметр раздаточного коллектора,
d_l - диаметр отверстия в большой мембране,
d_м - диаметр большой мембраны,
n - количество отверстий в большой мембране,
Н - высота подъема большой мембраны при открытом положении продувочного клапана,
π=3,14,
а площадь отверстий малой мембраны в 5-10 раз меньше площади отверстий большой мембраны и в 2,5-4 раза меньше площади сечения проходного отверстия электромагнитного клапана, при этом электромагнитный клапан установлен непосредственно на крышке продувочного клапана.The problem is solved due to the fact that in the known device for the regeneration of a fabric filter, including a purge valve, a receiver with a pipe, a dispensing manifold and an electromagnetic valve with a bore, in which the purge valve consists of a housing with a spring installed in it and a large membrane with holes, interacting with the end face of the dispensing manifold located in the receiver, which is the seat of the purge valve, according to the claimed invention, the receiver nozzle is made in the form of an elongated neck with a supporting flange, the purge valve is equipped with a cover with an outlet in it, an intermediate ring, a through and a discharge holes and a small membrane with holes installed between the cover and the housing and interacting with the discharge valve of the purge valve, a large purge valve membrane is located between it the housing and the intermediate ring, the end face of the dispensing manifold and a large membrane in the open position form an annular gap, the ratio of the area of the annular gap to the internal cross-sectional area of the distributor is

and the ratio of the area of the holes in the large membrane and the area of the annular gap between the end of the dispensing manifold and the large membrane in the closed position is

where d _with - the average diameter of the end of the distributor, which is the seat of the purge valve,
d _VN - the inner diameter of the distribution manifold,
d _l - hole diameter in a large membrane,
d _m - the diameter of the large membrane,
n is the number of holes in the large membrane,
N is the lifting height of the large membrane when the purge valve is open,
π = 3.14,
and the area of the holes of the small membrane is 5-10 times smaller than the area of the holes of the large membrane and 2.5-4 times smaller than the cross-sectional area of the passage opening of the electromagnetic valve, while the electromagnetic valve is mounted directly on the cover of the purge valve.

 Due to the placement of the end face of the dispensing manifold interacting with the large membrane and being the seat of the purge valve, in the receiver nozzle, which is made in the form of an elongated neck with a support flange, minimizes pressure loss during operation of the purge valve. For the manufacture of an elongated neck, the well-known technology created at the Institute of NIPI Energostal back in 1985 can be used, and the receiver is made of a circular pipe. Thus, it becomes unnecessary to purchase expensive imported square pipes.

 Due to such a connection between the purge valve and the receiver, the pressure loss in the system will be insignificant, the quick opening and closing of the purge valve create conditions for ensuring a high rate of pressure increase in the filter sleeve.

где d_с - средний диаметр торца раздаточного коллектора, который является седлом продувочного клапана,
d_вн - внутренний диаметр раздаточного коллектора,
Н - высота подъема большой мембраны при открытом положении продувочного клапана,
π=3,14.To ensure normal operation of the purge valve, the end face of the dispensing manifold and the large membrane in the open position form an annular gap, and the ratio of the area of the annular gap to the internal cross-sectional area of the distributing manifold is

where d _with - the average diameter of the end of the distributor, which is the seat of the purge valve,
d _VN - the inner diameter of the distribution manifold,
N is the lifting height of the large membrane when the purge valve is open,
π = 3.14.

When the purge valve is opened, the large membrane rises up and an annular gap equal to d _c • π • N is formed between the membrane plane and the end face of the dispensing manifold.

 When the ratio of the annular gap area to the internal cross-sectional area of the distributor manifold is less than 0.7, the resistance of the purge valve will be relatively large, and the momentum of the compressed air jet at the outlet of the end of the distributor manifold will decrease, the opening time of the purge valve will increase, which, in general, will lead to a deterioration in the efficiency of the purge valve.

 An increase in the ratio of the area of the annular gap to the internal cross-sectional area of the distributor manifold of more than 1.0 leads to an unjustified increase in the size of the purge valve and an increase in the amplitude of oscillations of the large membrane. The durability of the membrane sheet is reduced, which can lead to damage to the large membrane.

Управление клапаном должно осуществляться при помощи электрического импульса управления. Открытие клапана начинается с задержкой после начала подачи электрического импульса управления. Для обеспечения минимального времени между открытием и закрытием клапана необходимо электрический импульс управления прервать еще до получения максимального давления в рукаве.Thus, the optimal ratio of the area of the annular gap to the internal cross-sectional area of the distributor is

The valve must be controlled by an electrical control pulse. Opening the valve begins with a delay after the start of the electrical control pulse. To ensure the minimum time between opening and closing the valve, it is necessary to interrupt the electrical control pulse before the maximum pressure in the sleeve is obtained.

где d_l - диаметр отверстия в большой мембране,
d_м - диаметр большой мембраны,
d_с - средний диаметр торца раздаточного коллектора, который является седлом продувочного клапана,
n - количество отверстий в большой мембране,
π=3,14.To ensure the speed of the purge valve, which depends on the speed of opening and closing the purge valve and the time interval between them, based on experimental studies, it was found that the ratio of the area of the holes in the large membrane and the area of the annular gap between the end of the dispensing manifold and the large membrane in the closed position should make up

where d _l is the diameter of the hole in the large membrane,
d _m - the diameter of the large membrane,
d _with - the average diameter of the end of the distributor, which is the seat of the purge valve,
n is the number of holes in the large membrane,
π = 3.14.

 With this ratio, the optimal duration of the opening and closing of the purge valve is achieved while maintaining its speed.

 With an increase in the ratio of more than 0.08%, the opening time of a large membrane increases, and the time of its closure decreases. Conversely, with a decrease in the ratio of less than 0.2%, the opening time of a large membrane decreases "and the time of its closure increases.

 The area of the holes in the large membrane depends on the required pressure drop in the filter element / sleeve / fabric filter, which, in turn, depends on the dust characteristics of the dispersed composition. When the pressure drop in the filter element / bag / is greater than 1500 Pa, it is advisable to complete the purge valves with a large membrane with such holes in which the ratio of the area of the holes in the large membrane and the area of the annular gap between the end of the transfer manifold and the large membrane in the closed position will be close to the minimum boundary of the declared correlation. And in the case of conducting the filtering process with a pressure drop less than 1500 Pa, they are limited by the value of the upper boundary of the ratio.

In the large membrane of the purge valve, holes are provided, depending on the total area of which it is possible to reduce the duration of the time intervals for opening and closing the valve. Tests have shown that the optimal opening time of the purge valve should be less than 10 ms, and the closure should be no more than 70 mm. Such operation parameters of the purge valve d _y = 70 mm were obtained experimentally by making 4 holes with a diameter of 2 mm in the membrane. If the area of the holes in the large membrane is increased, for example, 4 holes with a diameter of 3 mm, the opening time increases and the closing time decreases, however, in general, the duration of opening and closing of the purge valve decreases.

 The ratio of the area of the holes of the large membrane and the area of the annular gap between the end of the dispensing manifold and the large membrane in the closed position is optimal. If you deviate from these values beyond the boundaries indicated in the application materials, the speed of the purge valve is violated.

The purge valve d _y = 40 mm, which is part of the known device / prototype / is not fast enough - its opening and closing time is 0.2-0.4 s. Therefore, when developing the claimed improved device for the regeneration of the fabric filter, it was based on the need to increase the performance of the purge valve by increasing its diameter, and to save the flow of compressed air, it was necessary to reduce the opening and closing times of the purge valve.

 Tests of experimental samples of purge valves showed that the necessary speed can be achieved only in a two-membrane purge valve, to which, as an electromagnetic valve, a standard distributor can be connected, for example П-PE 3 / 2,5-6212 / or a similar device / .

 Thus, the purge valve of the claimed regeneration device is equipped with two membranes: a large membrane is the main working membrane, and a small membrane is an auxiliary membrane. The purpose of the small membrane is to remove air from the space above the large membrane over a period of time significantly less than raising the large membrane when the purge valve is opened.

 The purge valve is equipped with an intermediate ring due to the need to hold and clamp a large membrane during installation or removal of the purge valve from the receiver by disconnecting the support flange on it.

 Equipping the purge valve with a small membrane necessitates equipping the purge valve with a cover with an outlet made in it, and a small membrane is located between the body and the cover of the purge valve, and an electromagnetic valve is installed directly on the cover of the purge valve.

 Placing the solenoid valve directly on the purge valve cover eliminates a number of disadvantages inherent in the known prototype device. Namely, when placing the electromagnetic valve at a certain distance from the purge valve, it is necessary to connect them with pneumatic tubes, as was done in the prototype. This increases the amount of air that must be removed when the electromagnetic valve is activated, due to the additional volume of the pneumatic tubes, as well as the possible depressurization of the threaded connections of the pneumatic tubes. This design solution of the prototype significantly reduces the speed of the purge valve. Therefore, the most rational technical solution is to install a solenoid valve on the purge valve cover.

In the claimed device, the area of the holes of the small membrane is 5-10 times smaller than the area of the holes of the large membrane. This ratio was obtained experimentally when testing a standard number of purge valves d _y = 50 mm, d _y = 70 mm, d _y = 90 mm.

 Reducing the boundary dimensions of the area of the holes of the small membrane will lead to a reduction in the time of its opening and increase the closing time, and with an increase in the boundary dimensions, the duration of opening of the small membrane increases, and the closure decreases. Both in the first and in the second case, a change in the parameters beyond the optimal boundaries negatively affects the operation of the large membrane and, accordingly, the speed of the purge valve.

 The approach is similar when choosing the parameters of the ratio of the area of the holes of a small membrane, which is 2.5 - 4 times smaller than the cross-sectional area of the passage opening of the electromagnetic valve.

 The area of the openings of the compressed air passage inside the purge valve after the large membrane to the small membrane and from the small membrane to the electromagnetic valve, as well as the dimensions of the discharge holes for the compressed air to enter the atmosphere after the small membrane and the electromagnetic valve, are taken from the conditions to ensure minimal pressure loss and design features of the purge valve.

 Based on the foregoing, as well as the disclosed causal relationship between the totality of the features of the claimed invention and the technical result obtained by their use, it can be argued that the task underlying the creation of a tissue filter regeneration device is fully completed, since the use of the invention provides a quick opening and closing the purge valve with a minimum time interval between them, a high rate of pressure increase in the filter element / sleeve / and, upon reaching and its maximum values, interruption of the compressed air supply to the bag filter cleaning system, as well as full and effective control of the opening and closing functions of the purge valve, and, as a result, we can conclude that a new device for regenerating the fabric filter with a quick purge valve has been created.

The essence of the invention is illustrated by drawings, which depict a device for regeneration of a fabric filter:
- figure 1 - in the closed position;
- figure 2 - in the open position.

 The fabric filter regeneration device consists of a purge valve with a housing 1, in which a passage 2 is made, a cover 3 with an outlet 4 made therein, an intermediate ring 5, a large membrane 6 and a small membrane 7 and a spring 8 installed in the housing 1; receiver 9 with an elongated neck 10 and a supporting flange 11 welded to it; the dispensing manifold 12 and the solenoid valve 13 with a through hole 14.

Соотношение площади отверстий 15 в большой мембране 6 и площади кольцевого зазора между торцом 17 раздаточного коллектора 12 и большой мембраной 6 в закрытом положении составляет

Площадь отверстий 16 малой мембраны 7 в 5-10 раз меньше площади отверстий 15 большой мембраны 6 и в 2,5-4 раза меньше площади сечения проходного отверстия 14 электромагнитного клапана 13. Электромагнитный клапан 13 установлен непосредственно на крышке 3 продувочного клапана.The holes 6 and 15 are made in the large 6 and small 7 membranes, respectively. The large membrane 6 interacts with the end face 17 of the distribution manifold 12 located in the receiver 9, which is the seat of the purge valve. A small membrane 7 is installed between the cover 3 and the body 1 of the purge valve and interacts with its passage hole 2. A large membrane 6 of the purge valve is placed between its body 1 and the intermediate ring 5. The end face 17 of the distributor 12 and the large membrane 6 in the open position form an annular gap moreover, the ratio of the area of the annular gap to the internal cross-sectional area of the dispensing manifold 12 is

The ratio of the area of the holes 15 in the large membrane 6 and the area of the annular gap between the end face 17 of the dispensing manifold 12 and the large membrane 6 in the closed position is

The area of the holes 16 of the small membrane 7 is 5-10 times smaller than the area of the holes 15 of the large membrane 6 and 2.5-4 times smaller than the cross-sectional area of the passage opening 14 of the electromagnetic valve 13. The electromagnetic valve 13 is mounted directly on the cover 3 of the purge valve.

 In the body 1 of the purge valve, holes 18 and 19 are made for venting during the opening of the purge valve, as well as grooves 20 for venting when the purge valve is closed.

 The fabric filter regeneration device works in this way.

 In the starting position / cm. figure 1 / in the presence of compressed air in the receiver 9 due to the pressure difference in the receiver 9 and the dispensing manifold 12, the large membrane 6 is tightly pressed against the end 17 of the dispensing manifold 12, which is the seat of the purge valve. At the same time, the space above the large membrane 6 is also filled with compressed air, which enters it through openings 15 in the large membrane 6 from the receiver 9. From the space above the large membrane 6, compressed air through the passage 2 made in the purge valve housing 1 fills the space under a small membrane 7 and through the holes 16 in the small membrane 7 above it. A small membrane 7 under the action of compressed air blocks its release into the atmosphere through openings 18 and 19, made in the body 1 of the purge valve. The electromagnetic valve 13 is also in the closed position under the action of gravity of its core and springs / not shown /. Thus, if there is pressure in the receiver 9, the large membrane 6 is tightly pressed against the end face 17 of the distribution manifold 12, closing the outlet of compressed air from the receiver 9 to the distribution manifold 12, and the small membrane 7, closing the openings 18 and 19, prevents the release of compressed air into the atmosphere from the submembrane space of the small membrane 7 and the supmembrane space of the large membrane 6. In this case, the electromagnetic valve 13. being in the closed position, blocks the air outlet from the supmembrane space of the small membrane 7 through the outlet Tie 4, made in the cover 3 of the purge valve.

 The process of regeneration of the filter element / sleeve / consists in creating a pressure pulse in it in the direction opposite to the surface on which dust particles settle during filtration.

 The opening of the purge valve in the system of the regeneration device is carried out in this way.

 An electromagnetic control pulse is supplied to the solenoid valve 13 and its passage opening 14 opens. Compressed air from the supmembrane space of the small membrane 7 through the outlet 4 made in the cover 3 of the purge valve is removed to the atmosphere. Due to the pressure difference under and above the small membrane 7, it opens, providing free access of compressed air to the atmosphere from the space above the large membrane 6 through the passage hole 2 in the housing 1 and further through the air discharge holes 18 and 19 made in the purge valve housing 1. In this case, the solenoid valve 13 must remain open. As a result, the space above the large membrane 6 is connected to the atmosphere and the large membrane 6 opens under the influence of air pressure in the receiver 9. Through the annular gap between the raised large membrane 6 and the end face 17 of the dispensing manifold, compressed air enters the dispensing manifold 12 and is then distributed to the filter elements of the filter / cm. figure 2 /.

 The valve closes in this way.

 After the supply of the electric control pulse to the electromagnetic valve 13 is stopped, it closes the outlet 4 of the purge valve cover 3 and the compressed air pressure above the small membrane 7 increases. Due to the difference in pressure forces on the small membrane 7 above and below it closes. The tight pressing of the small membrane 7 to the air discharge hole 18 is maintained due to the greater pressure force acting on the small membrane 7 above, in comparison with the forces from below, since the air discharge holes 18 and 19 communicate with the atmosphere.

 After the solenoid valve 13 and the small membrane 7 are closed, the drained air stops flowing out of the supmembrane space of the large membrane 6 through the grooves 20, the passage hole 12 of the housing I into the membrane space of the small membrane 7. The compressed air pressure above the large membrane 6 increases, which creates a greater force from above and a large the membrane 6 is pressed against the end face 17 of the distribution manifold 12. The spring 8 installed in the housing 1, helps to close the large membrane 6.

 The tight pressing of the large membrane 6 to the end face 17 of the distribution manifold 12 is supported by a greater pressure force acting in the direction of the axis of the distribution manifold 12.

 Tests of the claimed fabric filter regeneration device in pilot plants and industrial filters showed that such an improved design is characterized by high speed, relatively low hydraulic resistance, and reliable operation compared to the device selected as a prototype.

Claims (1)

A fabric filter regeneration device including a purge valve, a receiver with a nozzle, a distributor manifold and an electromagnetic valve with a bore, a purge valve consists of a housing with a spring installed in it and a large membrane with holes that interacts with the end of the distributor manifold located in the receiver, which is a saddle purge valve, characterized in that the receiver pipe is made in the form of an elongated neck with a support flange, the purge valve is equipped with a cover with there is a hole, an intermediate ring, a through-hole and a discharge hole, and a small membrane with holes installed between the cover and the housing and interacting with the blow-off valve’s discharge hole, a large purge valve membrane is located between its body and the intermediate ring, the end of the transfer manifold and a large membrane in the open position form an annular gap, and the ratio of the area of the annular gap to the inner cross-sectional area of the distributor is

and the ratio of the area of the holes in the large membrane and the area of the annular gap between the end of the dispensing manifold and the large membrane in the closed position is

where d _c is the average diameter of the end of the dispensing manifold, which is the seat of the purge valve;
d _VN is the inner diameter of the dispensing manifold;
d ₁ - the diameter of the holes in the large membrane;
d _m is the diameter of the large membrane;
n is the number of holes in the large membrane;
N is the lifting height of the large membrane with the purge valve open;
π = 3.14,
and the area of the openings of the small membrane is 5–10 times smaller than the area of the openings of the large membrane and 2.5–4 times smaller than the cross-sectional area of the passage opening of the electromagnetic valve, while the electromagnetic valve is mounted directly on the cover of the purge valve.

Images