DE20219621U1 - Dust filter with filter bags and blower - Google Patents

Description

LUEG 07 Tl.doc

Dust filter with filter hoses and blower

The invention relates to a dust filter with filter hoses which are arranged within a filter upper part belonging to a filter housing and can be fed with dust-containing gas from a feed chamber arranged below the filter upper part and within the filter housing by means of overpressure, as well as with a blower arranged upstream of the feed chamber, which is connected to the feed chamber via a pipeline.

Such a dust filter is known from DE 28 52 357 B2. The blower is subject to a lot of wear, as the raw gas can contain coarse dust, some with sharp edges. Cyclone pre-separators are therefore installed upstream of the feed chamber. The disadvantage of external pre-separators, however, is that they require more space. A not insignificant amount of additional noise can be observed with downstream fans.

The task is therefore to specify a design that saves space and keeps the noise level to a technically and economically acceptable minimum.

This task is solved by a dust filter of the type mentioned, in which the filter housing additionally has a

a pre-separation chamber arranged below the feed chamber and separated from it by a dividing floor, into which the raw gas is drawn and which is provided with separation means by which coarse particles are separated from the raw gas and can be collected below the pre-separation chamber, as well as with a connecting line between the pre-separation chamber and the blower.

The particular advantage of the proposed design is that the advantages of a pressure filter are retained and the operating noise is reduced. With a fan arranged behind the filter to reduce wear, noise levels of up to 110 dB are not unusual for larger dust filters. With the design proposed here, the wear on the fan is reduced and the noise is reduced to such an extent that a silencer is no longer necessary.

As a separation means in the pre-separation chamber, preferably at least one baffle wall should be installed, which forces the air flow to reverse movement. Instead of or in addition to the baffle wall, mechanical separation means that slow down the air flow to enable gravity separation can also be installed in the pre-separation chamber.

Preferably, the separating floor separating the feed chamber from the pre-separation chamber is provided with a pressure difference lock through which a material to be separated in the feed chamber can be discharged into the pre-separation chamber. The pressure difference lock can be a rotary valve.

To protect against excessive damage in the event of dust explosions, the separating floor is preferably equipped with safety explosion flaps.

Finally, it is proposed that a scraper arm be provided to facilitate the removal of separated dust, which is arranged so as to be rotatable immediately above the separating floor.

An embodiment of the invention is shown in the drawing.

The figures in the drawing show:

Figure 1 shows a dust filter according to the invention in a schematic representation;

Figure 2 shows a section according to B - B in Figure 1, with a plan view in the direction of the separating floor.

is averaged;

Figure 3 shows a section according to C - C in Figure 1.

From Figure 1 it can be seen that a dust filter 100 has an upright filter housing 2 in which filter hoses 1 hang in a filter upper part 3 in a manner known per se, which are fastened with their inlet and outlet openings at the top and bottom. Below the lower hose base 19 there is a feed chamber 4 into which a pipe 6 enters tangentially. The hose base 19 is provided with openings which are swept over by a rotating beam 18 which intermittently sucks the accumulated dust out of the hoses.

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A blower 5 installed upstream of the feed chamber 4 pushes dust-containing raw gas into the feed chamber 4. The dust particles accumulating in the feed chamber 4 are collected on the separating floor 11. They are introduced via an opening in the separating floor 11 via a rotary valve 9 into the pre-separation chamber 10 located below.

The filter housing 2 therefore additionally comprises a pre-separation chamber 10 arranged below the feed chamber 4 and separated from it by the separating floor 11. Highly contaminated raw gas enters the pre-separation chamber 10 via a feed line 16, which is fed, for example, by a raw gas collecting line. The negative pressure in the pre-separation chamber is generated by the connected pipe 7, which leads to the blower 5.

In the pre-separation chamber there is a baffle wall 8, on which coarse particles are separated from the raw gas. The coarse particles are collected via the collecting funnel 14 arranged below and disposed of via another rotary valve 17 into a collecting container (not shown) arranged below the dust filter.

It should be noted that the said separation means may not only consist of a baffle wall 8, but that instead of or in addition to the baffle wall, other mechanical separation means which slow down the air flow to enable gravity separation may be installed in the pre-separation chamber 10.

A pressure difference is built up between the pre-separation chamber and the feed chamber. The transport of the material to be separated from the feed chamber to the pre-separation chamber therefore requires a pressure lock with a large pressure difference. However, it is also possible that a pressure lock is used to

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Only one slotted opening is provided in the available air path through which the corresponding amount of the separated material can be disposed of, since the overpressure in the feed chamber 4 is greater than in the pre-separation chamber 10.

A rotatable scraper arm 12 is arranged above the separating floor 11, which is seen from above according to Figure 2. Furthermore, the separating floor 11 is provided with safety explosion flaps 13, which reduce the explosion pressure in the event of a dust explosion in the pre-separation chamber 10 and direct it into the upper area of the filter housing.

When the dust filter described is in operation, a certain amount of dust is circulated. Experience has shown that some of this dust agglomerates with larger particles and is separated from the air flow in the pre-separation chamber. This process is made possible or facilitated by the baffle wall 8. The baffle wall or another separation element forces the air flow to slow down, for example by deflecting it by 180°. Larger dust particles are removed from the gas flow. In addition, the pre-separation chamber upstream of the fan enables a significant reduction in noise.

Claims (7)

1. Dust filter ( 100 ) with filter hoses ( 1 ) which are arranged within a filter upper part ( 3 ) belonging to a filter housing ( 2 ) and can be fed with dust-containing gas from a feed chamber ( 4 ) arranged below the filter upper part and within the filter housing by means of overpressure, and with a blower ( 5 ) arranged upstream of the feed chamber, which is connected to the feed chamber ( 4 ) via a pipe ( 61 ), characterized in that the filter housing ( 2 ) additionally comprises a pre-separation chamber ( 10 ) arranged below the feed chamber ( 4 ) and separated from it by a separating floor ( 11 ), into which the raw gas is drawn and which is provided with separating means at which coarse particles are separated from the raw gas, which can be collected below the pre-separation chamber, and with a connecting line ( 7 ) between Pre-separation chamber and blower. 2. Dust filter according to claim 1, characterized in that at least one baffle wall ( 8 ) is installed as a separation means in the pre-separation chamber, which forces the air flow to reverse movement. 3. Dust filter according to claim 1 or 2, characterized in that instead of or in addition to the baffle wall ( 8 ), mechanical separation means which slow down the air flow to enable gravity separation are installed in the pre-separation chamber ( 10 ). 4. Dust filter according to claims 1 to 3, characterized in that the separating floor ( 11 ) separating the feed chamber from the pre-separation chamber is provided with a pressure difference lock through which a material to be separated accumulating in the feed chamber can be discharged into the pre-separation chamber. 5. Dust filter according to claim 4, characterized in that the pressure difference lock is a rotary valve ( 9 ). 6. Dust filter according to one of the preceding claims, characterized in that the separating floor is provided with safety flaps ( 13 ). 7. Dust filter according to one of the preceding claims, characterized in that a rotatable scraper arm ( 12 ) is arranged directly above the separating floor ( 11 ).