DE102017120120B3 - Apparatus and method for removing dust layers of thin-walled hollow filter bodies - Google Patents

Abstract

The invention relates to a device for cleaning dust layers of thin-walled hollow filter bodies (17) of textile, ceramic or plastic material by blowing back by means of pressure pulses, wherein the device is a compressed gas supply line (14) and at least one blow tube (13) for delivering a pressure pulse in a Filter body (17) and the compressed gas supply line (14) for the passage of a gas via a valve body (3) with the blow pipe (13) is connected. The invention further relates to an arrangement for cleaning a filter system, wherein the arrangement comprises a plurality of the described devices, and a method for cleaning dust layers of thin-walled hollow filter bodies (17) by means of the device or the arrangement. According to the invention, it is provided that the valve body (3) has a plurality of diaphragm valves (1) and a central outlet pipe, which is connected to the at least one blower tube (13), the diaphragm valves (1) are arranged around the outlet pipe and connected on the output side, and wherein the valve body (3 ) is directly connected to the compressed gas supply line (14).

Description

The invention relates to a device and a method for detaching dust layers of thin-walled hollow filter bodies made of textile, ceramic or plastic material. Furthermore, it relates to an arrangement for cleaning a filter system.

State of the art

Cylinder-like filter bodies are often used in dust filters, through which a gas laden with a dust charge, in particular air or other gases, flows through from the outside to the inside, the dust particles being deposited on the outer surface of the filter bodies by the filtering process.

The purified gases flow over the mostly cylindrical and open on one side open filter body in a clean gas room, from which they are discharged with a rule officially prescribed degree of purity to the atmosphere.

The accumulated by the filtration process dust layers on the filter body oppose the gas flowing through, depending on the operating time and dust loading, due to their increasing mass increasing flow resistance.

In order to be able to keep this low and thus within economical limits, the dust layers deposited on the filter bodies must be removed from the filter bodies at specific time intervals.

According to the prior art, this can be done by so-called pressure pulse systems. Here, a gas stored at high pressure via fast switching valves, usually diaphragm valves, blown via a blowpipe in the form of a pressure wave in one or more filter body.

The consequent reversal of the filtration flow in the individual filter bodies leads to a Abreinigungsströmung, which causes a detachment of the dust layers. The filter bodies cleaned in this way are then available almost continuously for a short-term interrupted filter operation.

In conventional pressure pulse systems, diaphragm valves are either directly connected to a compressed air tank or integrated into these as built-in valves, the valve outputs are connected to the blowpipes.

That's how it describes EP 1 105 202 B1 an annular gap injector for delivering a cleaning pulse through an annular, acting as a nozzle gap in a flow tube, wherein for supplying the pressurized gas connected to the annular channel pipe is arranged with a shut-off in or on a pressure accumulator.

Furthermore, from the EP 1 997 547 B1 a method for backwashing filters, in which a compressed air tank has a plurality of outlet lines, which are brought together in a nozzle. Each outlet line has a nimble valve, wherein the opening times of the fast valves, usually diaphragm valves, are tuned so that partial pressure pulses released by them arrive simultaneously at a common purge line or the blowpipe.

In the case of all pressure pulse systems of this type, a specific compressed gas volume must be made available to each filter body for adequate cleaning due to its physical condition. This is done by a corresponding dimensioning of the compressed gas storage tank and the membrane valves connected thereto.

With increasingly larger and therefore more economical filter systems is associated with the fact that the filter body have an increasingly large length. In order to clean these increasingly larger air or gas mass flows are required to achieve the desired cleaning effect.

Apparative devices such as compressed gas storage tank and diaphragm valves are required in ever larger nominal widths in order to clean at least the same or even a larger number of filter bodies can. However, there are technical and economic limits, since on the one hand from increasingly larger pressure systems pose greater risk potentials, which require appropriate safety precautions, and on the other diaphragm valves from a certain nominal diameter for the pressure impulse systems considered here due to their inertia are no longer usable.

Disclosure of the invention

Object of the present invention is to provide a technically and economically improved device for detaching dust layers of thin-walled hollow filter bodies made of textile, ceramic or plastic material.

The object is achieved by the features of the independent claims. Advantageous embodiments of the invention are specified in the subclaims.

The invention provides a device for cleaning dust layers of thin-walled hollow filter bodies made of textile, ceramic or plastic material by back-blowing by means of pressure pulses, wherein the device comprises a compressed gas supply line and at least one blowpipe for delivering a pressure pulse in a filter body and the compressed gas supply line for the passage of a gas is connected via a valve body with the blowpipe, wherein the valve body has a plurality of diaphragm valves and a central outlet pipe, which is connected to the at least one blowpipe, the diaphragm valves are arranged radially around the outlet pipe and output side connected thereto, and wherein the valve body symmetrical constructed to the central axis of the central outlet pipe and is connected directly to the compressed gas supply line.

Such a device has several advantages, a first of which is that the device is executable very small construction, since a valve body directly on the input side, that is without the provision of a compressed gas storage tank, to a compressed gas supply line, and the output preferably also directly to a blowpipe Delivery of a pressure pulse in one or more filter body connectable or connected in an advantageous embodiment. In this case, the meaning of a direct connection or a direct connection between the components is to be interpreted such that it comprises an intermediate circuit of short connecting pieces or sensor, control or regulating devices. This can be dispensed with, especially in comparatively large filter systems on a complex pipe installation between a compressed gas storage tank and the blowpipes.

Advantageously, a compressed gas feed line which is rather longer in comparison with the prior art is designed so long that its pressure medium volume corresponds to that of a compressed gas storage container used according to the prior art, or such that it generates a sufficiently large, depending on the dimension of a or more to be cleaned filter body, pulse is tuned.

In an advantageous embodiment of the device, the compressed gas supply line is designed to supply a high volume of pressure medium to feed from two sides. Furthermore, the compressed gas supply line may be designed, for example, as a ring line.

In this case, in particular economically advantageous that the compressed gas storage tank itself, for which in larger systems usually considerable safety precautions, combined with technical monitoring and / or certification are required dispensable.

Another advantage of the device is that the valve body has a plurality of diaphragm valves and a central outlet pipe. This means that small diaphragm several valves are integrated in a valve body, the valve body, however, has only one input and one output. By a distribution of the air or gas mass flow to a plurality of diaphragm valves, the individual diaphragm valves, which can be advantageously carried out in the same design, smaller dimensioned.

Both technical and economic advantages can be achieved with the smaller dimensions. Technically, smaller diaphragm valves have a lower inertia in relation to larger, whereby they can also be used to generate relatively hard, steep-flank pressure pulses in conjunction with a large mass flow. Furthermore, by the use of a corresponding plurality of diaphragm valves and comparatively slow and therefore cost-effective diaphragm valves can be used. Advantageously, the device with today commercially available diaphragm valves with a nominal diameter of preferably DN 50 executable. In an advantageous embodiment of the device, the diaphragm valves to a standardized and / or normalized design, which can usually be used on a larger number of suppliers.

As a further advantage, the device has a central outlet pipe. In this case, a central arrangement of the outlet pipe means that within the valve body several, but at least two diaphragm valves are arranged around the outlet pipe. The central arrangement of the outlet tube within the valve body may comprise a central or eccentric arrangement of the outlet tube. In an advantageous embodiment, the outlet pipe is arranged centrally within the valve body, whereby a simple, symmetrical construction of the valve body is supported.

Advantageously, the diaphragm valves are arranged radially around the outlet pipe. A radial orientation allows a large number of diaphragm valves to be arranged in a small space, with the connections of the valves also being easily accessible. Advantageously, the diaphragm valves are arranged at the same distance around the outlet pipe. In such an embodiment run at the same time opening of several diaphragm valves, the respective partial pressure pulses simultaneously in the outlet pipe together.

Advantageously, within the valve body, the distances of the diaphragm valves for Outlet pipe also be designed to be of different lengths to allow a staggered arrangement, a greater packing density of the diaphragm valves and thus at the same time an even smaller construction.

An orientation of the diaphragm valves in the direction of the axis of the outlet pipe can advantageously also take place at a different angle than a right angle, for example, advantageously at 45 °, in order to minimize a flow resistance within the valve body.

The arrangement of the diaphragm valves around the outlet pipe around can be done at the same height, or offset in height.

According to the invention, the valve body is constructed symmetrically to the central axis of the central outlet pipe. In an advantageous embodiment of the device, several or all diaphragm valves may be arranged vertically, in the same plane of rotation and at equal distances from the central axis of the central outlet tube. Such a configuration allows a simple, symmetrical structure and thus a simple and thus cost-effective production of the valve body.

In another advantageous embodiment of the device, a plurality of diaphragm valves open out in height offset in the central outlet pipe. Such a configuration has the advantage of being able to integrate a larger number of diaphragm valves in the valve body at a given diameter of the valve body. For example, the valve body can also have multiple planes of rotation with a plurality of diaphragm valves.

In an advantageous embodiment of the device, the valve body is designed and connected to the compressed gas supply, that an input-side flow resistance between the compressed gas supply line and the diaphragm valve for all diaphragm valves is the same, so that equally high partial pressure pulses are generated by all diaphragm valves and equal high air or Gas mass flows flow.

Advantageously, to optimize the air or gas flow, a central axis of the valve body and the center axis of the outlet pipe cover and the valve body on the opposite side of the outlet pipe have a centrally disposed opening for connection to the compressed gas supply line. In this case, this opening may be circular or have a shape which correlates with the arrangement of the diaphragm valves in the valve body. Thus, in the case of a valve body which has four diaphragm valves arranged at the same height, the opening may, for example, have a square design.

In an advantageous embodiment, the valve body made of extruded profiles made of aluminum or plastic, which allow a cost-effective production of a plurality of similar valve housing.

In another advantageous embodiment of the device, in particular if this has a valve body with integral formation of the outlet pipe and the outlets of the diaphragm valves, the valve body advantageously produced by injection molding or in 3D printing.

Advantageously, the device is designed such that the diaphragm valves are both jointly and individually switchable. Thus, in a device with, for example, six diaphragm valves, all six diaphragm valves can be switched together, or in two or three groups, for example, alternately or in specific clock sequences.

Advantageously, the device may have a control unit which is set up to control the diaphragm valves for the purpose of generating a pressure pulse. In an advantageous embodiment of the device, the control device is configured, under specification of, among other things, the design parameters of the valve body and the diaphragm valves arranged therein, as well as specification of a predetermined or predefinable form of a pressure pulse, a calculation of the opening duration and the opening times and a selection of the used Make diaphragm valves. Alternatively or additionally, the device can advantageously have a pressure sensor which is arranged, for example, in the blower tube and connected to the control device. In an advantageous embodiment of the device, the control unit is set up to carry out the calculated opening times and opening times and a selection of the diaphragm valves to be used, to measure a generated pressure pulse with the aid of the pressure sensor and to track the control variables for generating the pressure pulse.

In addition, the invention relates to an arrangement for cleaning a filter system, wherein the arrangement comprises a plurality of above-described devices for cleaning dust layers of thin-walled hollow filter bodies of textile, ceramic or plastic material by blowing back by means of pressure pulses and wherein the valve body of several of these devices directly to a common Compressed gas supply line are arranged.

Filter systems, such as those used in power plant construction, often have a Variety of arranged in an array filter bodies, wherein the filter body are spanned, for example, line by line of a plurality of blowpipes for cleaning the filter body in the row in question. By means of nozzles located on the blower tube, a pressure pulse in the form of blown jets can be emitted into the filter bodies of the respective row.

For such filter systems, the arrangement has the advantage that the arrangement for the cleaning of the filter system only has a pressurized gas supply line in the upper filter area. With regard to the example, this is advantageously arranged parallel to a first column of the array.

Further advantageously, the compressed gas supply line is directly connected to a plurality of valve bodies, wherein the outlet pipes of the valve body are each connected to a blowpipe, which is arranged above a row of the array. This compact installation is made possible by a small-sized form of the valve body, the lateral extent in the direction of the column axis does not exceed the center distance of the blowpipes.

Furthermore, the invention relates to a method for cleaning dust layers of thin-walled hollow filter bodies made of textile, ceramic or plastic material by blowing back by means of pressure pulses, wherein in a prescribed arrangement or a device described above for cleaning the filter body, a control pulse for generating the pressure pulse to at least one diaphragm valve is given.

In an advantageous embodiment of the method, one or more diaphragm valves are controlled or opened simultaneously or with a time offset with control pulses of the same or different length in order to form the pressure pulse.

list of figures

The invention will be explained in more detail with reference to the accompanying drawings with reference to preferred embodiments.

• 1 ein nach dem Stand der Technik übliches Membranventil in einer Ausführung als Einbauventil;
• 2 eine beispielhafte Ausführung eines Ventilkörpers mit zwei Einzelventilen,
• 3 eine beispielhafte Ausführung eines Ventilkörpers mit drei Einzelventilen,
• 4 eine beispielhafte Ausführung eines Ventilkörpers mit vier Einzelventilen,
• 5 eine beispielhafte Ausführung eines Ventilkörpers mit fünf Einzelventilen,
• 6 eine beispielhafte Ausführung eines Ventilkörpers mit sechs Einzelventilen,
• 7 eine beispielhafte Ausführung eines Ventilkörpers mit sieben Einzelventilen,
• 8 eine beispielhafte Ausführung eines Ventilkörpers mit acht Einzelventilen,
• 9 eine beispielhaft dargestellte Anordnung eines Einzel-Membranventils in einem Detailausschnitt in einem Ventilkörper für vier Einbauventile.
• 10 ein Beispiel einer Druckgaszuleitung im Querschnitt mit einem angeschlossenen Vierfach-Ventilkörper und ein daran angeschlossenes Blasrohr.
• 11 die schematisch dargestellte Filterfunktion „Filtrieren“.
• 12 die schematisch dargestellte Filterfunktion „Abreinigen“.
• 13 eine schematisch dargestellte Anordnung zum Reinigen einer Filteranlage mit einem Vierfach-Ventilkörper und dessen Zuführungsleitung, einem angeschlossenen Blasrohr, den Blasstrahlen und den in einer Filterplatte eingebauten Filterkörpern, hier in Form von Filterschläuchen.

Show it

• 1 a conventional prior art diaphragm valve in an embodiment as a cartridge valve;
• 2 an exemplary embodiment of a valve body with two individual valves,
• 3 an exemplary embodiment of a valve body with three individual valves,
• 4 an exemplary embodiment of a valve body with four individual valves,
• 5 an exemplary embodiment of a valve body with five individual valves,
• 6 an exemplary embodiment of a valve body with six individual valves,
• 7 an exemplary embodiment of a valve body with seven individual valves,
• 8th an exemplary embodiment of a valve body with eight individual valves,
• 9 an exemplified arrangement of a single diaphragm valve in a detail in a valve body for four cartridge valves.
• 10 an example of a compressed gas supply line in cross-section with a connected quadruple valve body and a blowpipe connected thereto.
• 11 the filter function "Filtering" shown schematically.
• 12 the schematically illustrated filter function "cleaning".
• 13 a schematically illustrated arrangement for cleaning a filter system with a four-valve body and its supply line, a connected blowpipe, the blow jets and built-in filter plate filter bodies, here in the form of filter bags.

Out 1 is a diaphragm valve 1 with valve cover 1a , Membrane 1b , Screws 1c and solenoid valve 1d which is in polar alignment in one of the 2 to 8th apparent valve body 3 can be installed.

The 2 to 8th show different valve body 3 , in their respective valve seats 2 diaphragm valves 1 are installed, with the respective valve seats 2 in the outlet pipes 5 to 11 open radially.

Depending on the number of diaphragm valves 1 the valves in the 2 to 8th referred to as two to eight times multi-valve.

From the 9 and 10 is a quadruple multi-valve with four diaphragm valves 1 seen. The quadruple multi-valve is in 10 on the one hand with a lid 12 closed, with the lid 12 an opening for connection to a blowpipe 13 and on the other hand with the fittings 15 at the compressed gas supply line 14 attached.

11 shows the filter function "Filtering" shown schematically. In the filtration phase, the dust gas hits 19 on the filtering surface of the here executed as filter bags filter body 17 and stays there as dust 20 stick in the form of a dust mass or dust layer. The clean gas 21 leaves the open top filter body 17 for further derivation.

12 shows the schematically illustrated filter function "cleaning". In the filter body cleaning is caused by the momentarily opened diaphragm valves 1 generates a pressure pulse, which from the blowpipe 13 in the form of blasting rays 16 in the filter body 17 flows. It dissolves on the filter body 17 accumulated dust 20 as a result of the pressure pulse flow 22 from. The dust 20 can then be discharged from the dust filter for further use.

13 shows a large number of filter bodies 17 , which takes the form of an array on a filter plate 18 are arranged, and in a schematic representation of an arrangement for cleaning a filter system with a plurality of devices for cleaning dust layers of thin-walled hollow filter bodies 17 made of textile, ceramic or plastic material by blowing back by means of pressure pulses.

The arrangement has for each line of the array a device for cleaning the filter body 17 the respective row, wherein the valve body 3 the devices side by side on a common, continuous compressed gas supply line 14 are arranged. Here is the compressed gas line 14 oriented parallel to a column of the array. The blowpipes 13 This arrangement are arranged parallel to each other and the lateral extent of the valve body 3 is smaller than the center distance of the blowpipes 13 ,

The valve body 3 are designed as a quadruple multi-valve and allow the delivery of a pressure pulse in the connected blowpipes 13 , from which this in the form of blasting rays 16 exit.
The blasting rays 16 are centric in the top open filter body 17 directed, the filter body 17 , here in the form of filter bags, in the filter plate 18 are attached dust-tight.

In a filter housing is the filter plate 18 a separating element between the dust gas space and the clean gas room.

LIST OF REFERENCE NUMBERS

1

Diaphragm valve, complete, with valve cover a), diaphragm b), screws c) and solenoid valve d)

2

valve seat

3

valve body

5

Valve body with outlet pipe for two diaphragm valves

6

Valve body with outlet pipe for three diaphragm valves

7

Valve body with outlet pipe for four diaphragm valves

8th

Valve body with outlet pipe for five diaphragm valves

9

Valve body with outlet pipe for six diaphragm valves

10

Valve body with outlet pipe for seven diaphragm valves

11

Valve body with outlet pipe for eight diaphragm valves

12

cover

13

blowpipe

14

Pressure gas line

15

screw

16

blow jets

17

Filter body (filter bags)

18

filter plate

19

dust gas

20

dust

21

clean gas

22

Pressure pulse flow

Claims (8)

Device for cleaning dust layers of thin-walled hollow filter bodies (17) made of textile, ceramic or plastic material by back-blowing by means of pressure pulses, wherein the device comprises a pressurized gas supply line (14) and at least one blower tube (13) for delivering a pressure pulse into a filter body (17) characterized in that the valve body (3) has a plurality of diaphragm valves (1) and a central outlet pipe, which with the at least one blower tube (13) is connected, the diaphragm valves (1) arranged radially around the outlet pipe and the output side connected thereto, and wherein the valve body (3) constructed symmetrically to the central axis of the central outlet pipe and connected directly to the compressed gas supply line (14) is. Device after Claim 1 , characterized in that the diaphragm valves (1) are arranged at the same distance around the outlet pipe. Device according to one of the preceding claims, characterized in that the diaphragm valves (1) have a standardized or normalized design. Device according to one of the preceding claims, characterized in that the diaphragm valves (1) are both jointly and individually switchable. Arrangement for cleaning a filter system, characterized in that the arrangement comprises a plurality of devices according to one of Claims 1 to 4 has, wherein the valve body (3) on a common compressed gas supply line (14) are arranged. Arrangement according to Claim 5 , characterized in that the blowpipes (13) of this arrangement are arranged parallel to each other and the lateral extent of the valve body does not exceed the center distance of the blowpipes (13). A method for cleaning dust layers of thin-walled hollow filter bodies (17) made of textile, ceramic or plastic material by blowing back by means of pressure pulses, characterized in that in an arrangement or a device according to one of Claims 1 to 6 for cleaning the filter body (17) a control pulse for generating the pressure pulse is applied to at least one diaphragm valve (1). Method according to Claim 7 , characterized in that one or more diaphragm valves (1) are opened simultaneously or with a time delay by control pulses of the same or different length to form the pressure pulse.

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