DE8612624U1 - Device for dedusting and / or detoxifying exhaust gases from thermal processes - Google Patents

Description

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Device for dedusting and / or detoxifying
Exhaust gases from thermal processes

Description:

The invention relates to a device for dedusting and / or detoxification of exhaust gases from thermal

Processes e.g. furnaces, kilns in brickworks,;

Suction hoods, melting ovens or casting molds in casting ■

factories or drying systems, whereby dust and / or |

gaseous pollutants are removed from the exhaust gases

the should. \

Among such devices, special devices are known for dust removal in which the gas is blown tangentially into a cyclone-like housing such as a cyclone separator. Coarser partial | thrown on the inside wall of the housing and fine | Particles on a fabric filter, for example from one or more bag filters in the interior of the cyclone-like | Housing deposited. Filters made of fabrics or fiber | However, nonwovens have the disadvantage that they are very hot in the case of hot exhaust gases, which can also contain sparks
can be destroyed quickly. ']

A catalytic conversion of gaseous pollutants \

is generally not possible with fabric or non-woven fabric filters. !

The object of the invention is the use of filter elements in a cyclone-like housing, which are not affected by high temperatures or flying sparks, and that too
be coated with catalytically active metals
can.

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The invention solves the problem according to the protection claims 1 .- to 4i

The figures explain the invention using two schematically illustrated examples:

FIG. 1 shows an example according to protection claims 1. Figure 2 shows an example according to Schützänspruch 2.

In FIG. 1, the exhaust gas 2 is blown tangentially into the cyclone-like housing 1. Particles contained in the exhaust gas 2 are discharged through the rotary valve 3 or an equivalent lock.

The tubular body 4 made of ceramic foam is arranged concentrically in the housing 1 * This is through on the inside radial walls 5 divided into chambers 6. In the case of a cylindrical tubular body 4 - as shown - the chambers have 6 shows the cross section of circular segments, in the case of a polygonal tubular body the cross section is triangular. The tubular body 4 is closed at the bottom by a plate 7 or by a corresponding disk made of ceramic foam. At the top, the tubular body 4 opens into a flap control apparatus 8 in which the shutter flaps are not shown or valves for the individual chambers 6 are installed with an automatic control system. At least one chamber each is closed by a flap or valve and at the same time by a pressurized gas flow from the inside to the inside applied externally. The compressed gas is passed through the channel 9 into the control apparatus 8. That of the pressurized gas Chamber 6 assigned circumference - part of the tubular body 4 is cleaned from externally deposited dust. All other chambers 6 are directly connected to the clean gas nozzle 10 by the control apparatus 8, through which the cleaned exhaust gas is passed on - for example via an induced draft fan into a chimney.

In Figure 2, practically everything is analog, only the parts of the tubular body 4 an - in this example polygonal - outer tubular body 11 and an equally such inner one Tubular bodies 12 are arranged, the radial walls 5 only in the annular space between the two tubular bodies 11 and 12 which in this case have a trapezoidal cross-section having chambers 6 form. This arrangement of two or more concentrically arranged one inside the other Tube body, the effective filter area is significantly increased. All functions are analogous to the schema section = development and description of Figure 1.

The invention is not limited to these two shown Examples. Several tubular bodies could also be bundled as in the known bag filter systems in the center arranged in a cyclone-like housing and via a corresponding control device for pressure surge cleaning in each case a single pipe body to be connected to the clean gas nozzle. Could just as well be after a well-known species Pocket filter several filter elements with plate-shaped! Ceramic filter material - foam arranged in bundles will.

The advantages of the invention over the known filters with fabric or fiber fleeces are that up to very high ranges, for example up to 1,500 ο c, sufficient temperature resistance the filter material made of ceramic foam, the complete insensitivity of this filter material to Flying sparks and the additional possibility of this filter material to be coated with catalytically active metals, in addition to a dust separation, a catalytic To be able to convert harmful gases in the exhaust gas. This is particularly useful when, for example, behind a kiln for brickworks with organic pore formers, unburned hydrocarbon compounds are contained in the exhaust gas of the kiln.

Also found in numerous other thermal processes In addition to dust, there are also gaseous pollutants in the exhaust gas, which are catalytically converted or rendered harmless

S the can.

Claims (4)

Device for dedusting and / or detoxifying exhaust gases from thermal processes Protection claims: I ₄ . Device for dedusting and / or detoxifying exhaust gases from thermal processes with a < Filter element in a housing like a J
Cyclone separator, characterized in that as a filter element a cylindrical or polygonjj shaped tubular body (4) made of ceramic foam is arranged, the inside by radial walls (5) in chambers (6) with the cross section of a segment of a circle or is divided into triangles. 2. Device according to claim 1, characterized in that two or more tubular bodies are used as the filter element (11,12) circular or polygonal cross-section are arranged concentrically one inside the other, the spaces between them being formed into chambers by radial walls (5) (6) are subdivided with, for example, a trapezoidal cross-section. 3. Device according to claims 1. and / or 2., characterized characterized in that the chambers (6) with a flap control device (8) to the clean gas nozzle (10) are provided that each close at least one chamber (6) to the clean gas nozzle (10), while At the same time, a gas is blown into this chamber (6) with a pressure surge via a pressure gas line (9) will. 4. Device according to claims 1 to 3, thereby characterized in that the ceramic foam of the tubular body (4, 11, 12) with catalytically active Metal is coated. < I HI> I Il (Ii * · I IfIII II · **! · * I IlIl t I i * * · · I Il I 1 * 1 «« «•• III III i