WO2015055157A1

WO2015055157A1 - Filter system having a rotary filter

Info

Publication number: WO2015055157A1
Application number: PCT/DE2013/000617
Authority: WO
Inventors: Dirk Barnstedt
Original assignee: Dirk Barnstedt
Priority date: 2013-10-17
Filing date: 2013-10-17
Publication date: 2015-04-23

Abstract

The present invention proposes a filter system (1) which is arranged in a housing (2). In approximately the center of said housing (2) there is situated a rotary filter (6), the lateral surface of which is covered by a filter medium. The interior of the housing (2) is divided into three pressure regions (17, 18, 22). The untreated gas for purification is supplied to the untreated gas region (17) through an untreated gas inlet opening (8). Here, as it enters the untreated gas chamber (17), the gas flow initially impinges on an impingement element (9), causing intense turbulence in the gas flow. A cleaning process is performed during every rotation of the filter drum, by blowing away the filter material on the lateral surface of the filter drum (6).

Description

FILTER SYSTEM WITH A ROTATION FILTER

The present invention is concerned with according to the preamble of

Main claim with a gas filter system with a rotary filter,

in particular with a gas filter system comprising substantially three

Has gas pressure ranges that interact with each other.

Such a drum filter cleaning device is known from DE 1 703 945 in the prior art. This drum filter cleaning device has a rotating drum, on the outer circumferential surface of which a filter material is arranged, on which the dust to be deposited settles and is swept off a rotating brush. The swept-off dust is then blown into a collecting slot from a slot jet generated inside a drum and fed to a cyclone, the cleaning of the drum filter being carried out in a single closed air flow first by blowing off and then by suction.

Furthermore, in the prior art, a gas filter system from the document DE 36 08 741 A1 has become known. This document discloses a rotary filter with a rotating hose drum, into which a blowing tube protrudes with a nozzle, which is arranged in the vicinity of the inside of the filter drum, so that the filter material rotates past the blow pipe and is blown off. In this case, the raw gas or the unpurified gas is introduced tangentially into a round housing and through baffles in a spiral flow brought so that due to the centrifugal force most of the dust particles hit the walls of the baffles and should fall due to gravity. The remaining smaller dust particles should be in accordance with the

Basic idea of this invention on the filter material of the rotating

Hose filter and hang on the filter material. These dust particles located on the filter material are then blown off by the blowing force of the nozzle and fall into a collecting container of the housing, from which the dust particles are discharged. A disadvantage of this filter system with a rotary filter, it is felt that the raw gas tangential to

Rotary filter in the housing at a relatively high speed

is blown and is brought by the baffles in a spiral flow. As a result, although the relatively heavy particles contained in the raw gas, deposited by centrifugal force, but the majority of the small and micro dust particles remain due to the strong gas flow in the flow channel, so that they do not have the opportunity to attach themselves to the jacket of the rotor , for which alone the suction power of the clean gas nozzle is not sufficient to achieve the desired degree of purification of the raw gas.

Furthermore, from the German utility model GT. A. 727714

Dust filter with a rotating round filter drum has become known, which is arranged concentrically in a round housing. Again, the raw gas to be cleaned is injected tangentially to the filter drum and sucked the clean air from the interior of the filter drum. The remainder of the remaining fine dust is blown off through a slot-shaped nozzle during rotation of the filter drum in a relatively small semicircular tube and fed to a funnel-shaped container. A disadvantage it is felt, inter alia, in this device that the relatively thin tube can not absorb the amount of air to absorb the resulting Ausblasmengen the blowpipe so that it must come to backflow, which could interfere with the operation process. Furthermore, it is also considered to be disadvantageous that the raw gas flowing in tangentially to the drum due to the high flow rate constantly in strong turbulence remains, whereby the degree of purification of the raw gas is reduced and will not lead to a satisfactory result.

Furthermore, from DE 37 30 980 A1 a filter apparatus for gas streams has become known, which has a rotary drum, on the lateral surface thereof

Filter elements are arranged, which can be replaced individually when worn or ineffective, whereby an enlargement of the filter surface in relation to the space required to be achieved. In the

Filter drum protrudes an elongated blowpipe from the opening

relatively strong gas stream exits through which the individual filter elements can be blown off on the jacket of the rotary filter. A disadvantage of this filter system, on the one hand, the flow direction of the raw gas with respect to the filter drum perceived and on the other hand, the placement of individual filter elements on the filter drum, which is too time-consuming and complicated in practice.

Therefore, it is an object of the present invention to provide a filter system for large gas flow rates, the degree of purification meets the requirements for clean gas rooms and in the design and handling is simple and inexpensive.

This object is achieved with the characterizing features of the main claims. Other features essential to the invention can be found in the dependent claims and the detailed description.

According to the invention, the gas filter system is in a housing with at least one raw gas inlet and at least one clean gas, and a rotating filter drum and at least one arranged inside the filter drum, characterized in that the housing volume of the housing is divided into at least three pressure areas and behind the raw gas inlet opening in Housing a bouncing element is arranged, which flows into the raw gas and the rotating filter drum at least one homogeneous Layer of a filter material, wherein the filter drum is at least one end face with at least one clean nozzle in operative connection.

The associated process according to the invention for the purification of raw gas, which is supplied to a filter system, is characterized by the following process steps:

Dividing the inner housing volume into at least three pressure areas, one area for the raw gas and the other area being provided essentially for the clean gas and a further area acting as a blow-off space;

Supplying the raw gas to be cleaned into a housing with a rotating filter drum;

Supplying a second gas stream with significantly higher

Pressure as in the raw gas range; in which

the second gas stream by means of one or more

longitudinally shaped nozzles or blowpipes in the vicinity of the inner circumferential surface in a separate space emerges in which the

Dust particles are collected and discharged.

With the present invention, a filter system is presented, which is arranged in any housing. In this housing is located approximately in the center of a rotary filter whose outer surface is covered with a filter medium. The interior of the housing is divided into three pressure areas. The raw gas to be purified is supplied to the raw gas region through a raw gas inlet. The gas flow bounces when entering the raw gas space, first against a bounce element, whereby strong turbulence of the gas flow arise. By blowing off the filter material on the mantle surface of the filter drum, a cleaning process is performed with each rotation of the filter drum.

It is advantageous that the filter drum rotates at a peripheral speed of about 0.1 m / s to 5 m / s. Another advantage is seen in the fact that in the housing in one

predetermined distance (a) to the inlet opening of the raw gas

Bouncing element is arranged, which completely covers at least the opening area of the raw gas inlet opening.

It is also advantageous that the longitudinal axis of the filter drum is arranged vertically or horizontally in the housing.

It is also advantageous that the gas outlet opening of the nozzle

the second gas supply line is slit-shaped, wherein the slot or arranged in series blowpipes extends over almost the entire length (H) of the filter drum.

It is also advantageous that below the filter drum, a funnel-shaped collecting device is arranged, in which the filtered-out material

is caught and discharged.

Another advantage is seen in that the housing volume is divided into three areas, with an area for the raw gas, and the

another area is provided essentially for the clean gas, and the further area is provided as a blow-off room.

It is also advantageous that the filter material of the homogeneous

Filtering layer is a polyester needle felted or similar

Material exists.

It is also advantageous that over the filter layer of the filter drum

a cladding layer is disposed, which is the surface of the filter layer

supports. Another advantage is seen in the fact that on the surface of

outer layer of the filter drum along the height (H) of the filter drum in the immediate vicinity of the slot-shaped outlet opening at least one

Cleaning sealing element is arranged, which is the surface of the

Filter drum cleans and seals during rotation of the filter drum.

It is also advantageous that behind the slit-shaped nozzle

at least two separators at a predetermined angle (a)

are arranged to each other, which separate the raw gas from the blow-off area.

It is also advantageous that along the slot-shaped nozzle

at least two seals are arranged, which are the inside of the

Touch the filter drum.

Another advantage is seen in that the second gas stream

pulsed or continuously discharged from the nozzle or the series arranged blowpipes at a significantly higher pressure (p about 8 bar).

It is also advantageous that the rotational speed of the

Filter drum surface is a function of the differential pressure (Δρ) between the clean gas space 18 and the raw gas space 17 within the housing 2.

In the following, the invention will be explained in detail with reference to drawings. It shows

Figure 1 is a schematic perspective view of the

Gas filter system (1), which is arranged in a housing (2); Figure 2 is an exploded perspective view of the system (1) with a round housing (2) on a frame (2 ');

Figure 3 is a side view of the system (1) in a housing (2) with a Rohgaseintrittsstutzen (8 ') and a clean gas outlet nozzle (5), and a plurality of Gasabsaugstutzen (26');

Figure 4 is a schematic side view of the gas filter system (1), in which a blow-off (4) inside the filter drum (6) is arranged, whose volume in adjustable volumes (27, 27 ', 27 ") is divided;

Figure 5 is a schematic plan view along the section line A - A in

Fig. 4 on a square housing (2), inside which a baffle element (9), a filter drum (6), and two

Separating elements (21, 21 ') are arranged.

Figure 6 is an enlarged partial sectional view of the area B from

Fig. 5;

In Figure 1 is a schematic perspective view of the

Gas filter system 1 shown. In this embodiment of the present invention, the housing 2 is positioned on a support frame 2 ', not shown here, which is fixed with the feet on a bottom plate. Inside the housing 2, the actual filter system is arranged. The interior of the housing 2 is essentially divided into three gas areas in which different gas pressures prevail during operation. Approximately centrally in the housing volume, a circular or polygonal filter drum 6 in a first gas pressure region 17 (raw gas region) is arranged, which is formed relatively large volume. In the filter drum 6 performs a gas pressure supply line 14, at the end of an elongated nozzle 4 (lance) is connected. Above the raw gas chamber 17 is in this embodiment of the

Plain gas region 18 is arranged, which communicates with the clean gas discharge line 5. The raw gas is supplied to the raw gas portion 17 through the raw gas inlet 8. In order to prevent the relatively strong flow of the raw gas unabated and unimpaired enters the raw gas space 17, in the direction of the raw gas flow behind the raw gas inlet opening 8 is a bounce element. 9

arranged that at least the entire surface of the cross section of the

Raw gas inlet opening 8 hidden, so that the Rohgasprimärströmung immediately after entering the raw gas area 17 abuts the bumper element 9. As a result, first the flow direction of the raw gas stream is changed. As a result of this flow direction change, the raw gas flow is divided equally and distributed homogeneously with the remaining small and

Small dust particles in the raw gas range 17, which is filled with its entire volume homogeneously with the raw gas to be purified. Within the

Rohgasbereiches 17 are at least two separating elements 21, 21 'are arranged, which define and limit a blow-off 22. The raw gas area 17 and the clean gas area 18 are separated from each other by means of a partition wall 3.

2 shows an exploded perspective view of the system 1 with a round housing 2 on a frame 2 '. Through the gas inlet nozzle 8 'enters the loaded with dust raw gas into the interior of the housing 2 and meets there immediately after entry on a baffle element 9, bounce on the heavier entrained particles and due to the effect of gravity in a

Collecting device 16, 16'herabfallen in which the particles are discharged. Approximately in the middle of the cylindrical part of the housing 2, a filter drum 6 is arranged on, which is offset during the filtering operation of the raw gas by a drive 6 'in rotation. On the opposite side of the baffle element 9 at least two separating elements 21, 21 'are arranged, which separate the raw gas region 17 from the exhaust gas region 22. The exhaust gas is then extracted by one or more exhaust ports 26. Above the housing 2 is the

The clean gas duct 5 is arranged with the clean gas discharge, which distributes the clean gas to the rooms to be ventilated. 3 shows a side view of the system 1 in a housing 2 with a raw gas inlet nozzle 8 'and an exhaust gas outlet nozzle 26, to the in

present partial embodiment 26 'are arranged to produce a favorable pressure distribution in the exhaust port and a

After treatment of the exhaust air to allow. Below the top of the

Housing 2 is the drive 6 'or the rotary ring for the filter drum. 6

arranged, to which projects at least one sealing element 24, which will be described in more detail below. Above the top side of the housing 2 is the

Clean gas discharge 5 arranged.

FIG. 4 shows a schematic side view of the gas filter system in which a blow-off element 4 in the form of an elongate nozzle or a blowing tube 4 'arranged in series with one another is immersed in the filter drum 6. The internal volume of the blow-off element or elongate nozzle 4 can, if appropriate, be subdivided into different regions 27, 27 ', 27 "in order to ensure a uniform blow-off of the dust particles from the surface of the filter material, in these regions 27, 27', 27". There is a significantly higher gas pressure than in the surrounding the filter drum 6 raw gas space 17 and / or the blow-off space 22 between the two separating elements 21, 21 ', which separate the raw gas chamber 17 from the exhaust gas chamber 22, and to the at least two elongated sealing elements 24, 24' on the long side are arranged, which are described in more detail below.

The raw gas to be purified is introduced via a supply line, not shown here, the inlet opening 8 of the raw gas chamber 17 with a predetermined

Flow rate supplied to the raw gas region 17, in which an adjustable pressure (p _a ) prevails. After discharge of the raw gas from the opening 8, the flow mass of the raw gas impinges on the baffle plate 9, which is arranged at a predetermined distance (a) from the raw gas inlet opening 8. This predetermined distance (a) is variably adjustable and depends essentially on the respective flow rate of the raw gas. Due to the deflection effect of the baffle plate 9 of the raw gas flow, the raw gas is distributed to all sides of the baffle plate 9 in the raw gas space relatively evenly, the fine dust particles in the raw gas are kept floating by the suction in the clean gas line 5 and then in the direction of the filter drum shell or against a homogeneous filter layer 10, not visible here, sucked. The used filter medium is depending on

To select cleaning gas and exists for the air to be purified from a polyester needle felt, which is kulandiert. The filter material may also be made of another similar material having the same filter characteristics. The bottom 6 "of the filter drum 6 is closed with a filter medium and can optionally be exchanged .. In the upper area of the filter drum 6, a turntable 6 'with a drive is arranged on the circumference of the filter drum via which the filter drum is driven by means of a drive element not shown here The top surface of the filter drum 6 is open at the top, so that the cleaned gas can be sucked out of the clean gas region 18.

In the simplest case, the elongate blow-off element 4 (lance) projects through this cover surface into the interior of the filter drum, wherein the opening of the blow-off element 4 is designed as an elongated slot nozzle 4 'whose outlet opening is arranged in the immediate vicinity of the gas-permeable jacket surface of the filter drum 6. The blower 4 or lance is with a relatively high

Gas pressure of about 8 bar applied. With the shape of the predetermined

elongated outlet opening of the nozzle 4, the pressure within the elongated nozzle 4 can be kept approximately constant at all exit points of the gas stream, so that the filter material is evenly blown through at all points of the shell, thereby ensuring a uniform cleaning of the fixed dust particles in the blow-off 22 is.

In another embodiment of the lance 4 are transverse to the longitudinal axis of the lance a plurality of blowpipes having a predetermined diameter and distance from each other, which need not be uniform, arranged, from which the gas can escape and thus take over the function of the elongated nozzle 4 ' can. As a result of the rotation of the filter drum 6, the attached filter layer 10 of the jacket wall thus becomes with each rotation of the filter drum freed from attached dust particles. Above the raw gas chamber 17, the clean gas space 18 is arranged, in which, as a result of the suction action of the clean gas line 5, a certain negative pressure (pi) is generated. The pressure (p _a ) in the raw gas space 17 and the pressure (p,) in the overlying clean gas area 18 are measured. As soon as the pressure difference (Δρ) between the raw gas region (p _a ) and the clean gas region (Pi) exceeds a predetermined value (Δρ max), control measures are automatically taken, eg. B. increasing the speed of the filter drum 6 or increasing the firing order of the pulsed Abblasdüse 4 or increasing the

Gas pressure in the exhaust lance 4, to lower the pressure difference again.

The dust particles located in the blow-off region 22 settle over time in the lower region 16 of this cavity and are supplied to a dust container 25 provided for this purpose, or the exhaust air is supplied via the

Exhaust air pipe 26, 26 'fed to a further processing.

Fig. 5 shows a schematic sectional plan view of a quadrangular housing 2 along the section line A - A of Fig. 4. In this present

Embodiment of a quadrangular housing 2 is positioned approximately in the middle of the filter drum 6, in which projects the blow-off 4. To the

Blow-off 4 is a box with an elongate nozzle 4 'arranged. The elongated nozzle 4 'can also be replaced by a series of mutually arranged blowpipes, which depends in detail on the application. The pressures in the blowing member 4, and the exit velocities of the gas streams from the nozzle or the blowpipes are variable adjustable and depend on the degree of dust occupancy of the filter material at the

The lateral surface of the filter drum 6. Similarly, the distance of the exit of the nozzle from the drum filter 6 is variable and adjustable. The gas stream leaving the nozzle 4 'first penetrates the filter material of the filter drum 6 and is then supplied to the blow-off space 22, to which a blower chamber, not shown here, is fed

Suction device is arranged, which sucks the dust-laden gas. The filter drum 6 consists in the simplest embodiment of a

cylindrical shell, which is gas permeable and on one side, either inside or outside, a filter layer with a special filter material

is arranged, in which the individual particles settle due to the prevailing pressure differences in the raw gas area 17 and the clean gas area 18. As a result of the impact of the raw gas flow on the bounce element 9 and the resulting turbulence caused by the gas flow, a relatively uniform and homogeneous distribution of the dust particles in the total volume of the raw gas space 17, whereby a uniform

Actuation of the filter medium is effected. Directly in the inlet region of the blow-off space 22 elongate sealing elements 24, 24 'are arranged, which are made of a relatively resilient material and at least touch the jacket wall of the rotary filter 6.

As already mentioned, the distance (b) between the drum wall 6 and the outlet of the nozzle 4 'is variably adjustable, so that at least the core of the

Gas Ausströmkegels from the nozzle 4 'is not too wide and leads into the center of the inlet opening 27, which is also supported by a lip seal 28. The inlet opening 27 is on the one hand by the folded dividers 21, 21 'limited to the ends of which a sealing or cleaning element 24, 24' is arranged. In general, the sealing or

Cleaning element 24, 24 'a dense brush, the surface of the

Touched filter material under light mechanical pressure and thus removed or loosened the applied dust particles, and then easier from

Gas flow to be detected. At the same time the elongated brush or soft and flexible sealing element 24, 24 'seals the suction region 22 from

Crude gas range 17 from.

Claims

1. Gas filter system (1) in a housing (2) with at least one

Rohgaszuleitung (3) and at least one clean gas discharge (5), and a rotating filter drum (6) and at least one inside the filter drum (6) arranged blowing member (7), characterized in that the housing volume of the housing (2) in at least three

Pressure areas is divided and behind the Rohgasaustrittsöffnung (8) in the housing (2) a baffle element (9) is arranged, on which the raw gas flows and the rotating filter drum (6) at least one homogeneous layer (10) of a filter material, wherein the filter drum ( 6) is at least one end face (11) with at least one clean nozzle (12) in operative connection.

2. Filter system according to claim 1, characterized in that the filter drum (6) rotates at a peripheral speed of about 0.1 m / s to 5 m / s.

3. Gas filter system according to claim 1, characterized in that in the housing (2) at a predetermined distance (a) to the inlet opening (8) of the raw gas, a bouncing element (9) is arranged, which is the

Opening surface of the raw gas inlet opening (8) completely covered.

4. Gas filter system according to one of the preceding claims, characterized in that the longitudinal axis (13) of the filter drum (6) is arranged vertically or horizontally in the housing (2).

5. Gas filter system according to one of the preceding claims, characterized in that the gas outlet opening (4 ') of the nozzle (4) of the second gas supply line (14) is formed as a blow lance slit, wherein the slot (15) is almost over the entire length (L ) of the filter drum (6), or the lance (4) arranged transversely to the longitudinal axis of the blower tube (4 ').

6. Gas filter system according to one of the preceding claims, dad urch in that below the filter drum (6) has a

Collecting device 16 is arranged, in which the filtered-out material is collected and discharged.

7. Gas filter system according to one of the preceding claims, dad urch in that the housing volume in three pressure ranges (17, 18, 22) is divided, wherein a region 17 for the raw gas and the other region (18) is provided substantially for the clean gas , And another area (22) is provided as a blow-off.

8. Gas filter system according to one of the preceding claims, characterized in that at least one homogeneous filter layer (10) made of Polyesternadelfilz, which is kulantriert, or similar material, which is arranged on the jacket of the filter drum (6) and is substantially formed as a seamless tube ,

9. Gas filter system according to one of the preceding claims, characterized in that above the filter layer (10) of the filter drum (6) a jacket layer (19) is arranged, which supports the surface of the filter layer (10) and the filter material loosely or non-positively with the

Jacket layer is connected.

10. Gas filter system according to one of the preceding claims, characterized in that on the surface of the outer layer (19) of the Filter drum (6) at least along the height (H) of the filter drum (6) in the immediate vicinity of the slot-shaped outlet opening (4) at least one cleaning sealing element (23, 23 ') is arranged, the surface of the filter drum (6) during rotation of the Filter drum cleans and seals.

11. Gas filter system according to one of the preceding claims, characterized in that behind the slot-shaped nozzle (4) or blower tube (4 ') at least two separating elements (21, 21') at a predetermined angle (a) are arranged to each other, the

Disconnect the raw gas area (17) from the blow-off area (22).

12. Gas filter system according to one of the preceding claims, characterized in that along the slot-shaped nozzle (4) or blower tube (4 ') at least two seals (24, 24') are arranged, which touch the outer side (20) of the filter drum (6) ,

13. Gas filter system according to one of the preceding claims, characterized in that a second gas stream with significantly higher pressure (eg., About 8 bar) pulsed or continuously from the nozzle (4) or the blast tube (4 ') emerges.

14. Gas filter system according to one of the preceding claims, dadu rch in that the distance of the blow-off (lance, nozzle) to the filter material is variable adjustable.

15. Gas filter system according to one of the preceding claims, characterized in that the blow-off of the filter material is divided into zones, wherein the zones are sucked off with different Lich adjustable gas flow rates.

16. Gas filter system according to one of the preceding claims, dadu rch characterized in that the measured differential pressure (Δρ) between the clean gas space 18 and the raw gas space 17 within the housing 2 as a control parameter for the rotational speed of the

Filter drum surface or increasing the firing order of the pulsed Abblasdüse 4 or increasing the gas pressure in the exhaust lance 4 is used.

17. Method for purifying raw gas which is fed to a filter system (1), characterized by the following method steps:

Dividing the inner housing volume in at least three

Pressure ranges (17, 18, 22), wherein a region 17 for the raw gas and the other region (18) is provided substantially for the clean gas and a further region (22) is provided as a blow-off space;

Supplying the raw gas to be cleaned into a housing (2) with a rotating filter drum (6);

Supplying a second gas stream with significantly higher

Pressure as in the raw gas range (18); in which

the second gas stream by means of one or more

Long-shaped nozzle (4) or blowing tube in the vicinity of the inner circumferential surface (10) in a separate space (22) emerges, in which the particles are collected and discharged.