FILTER SYSTEM COMPRISING A LAYER WITH ACTIVE ADSORBENT CONTAINING BAGS

Abstract

A filter system for adsorbing an odor of a gas flow in an industrial process includes a filter module (1) with a layer (11) containing active adsorbent (3). The layer (11) includes a plurality of active adsorbent containing permeable bags (2) arranged in close proximity to each other.

Claims

1. Filter system for adsorbing an odour of a gas flow in an industrial process comprising a filter module (1) with a layer (11) containing an active adsorbent (3), characterized in that the layer (11) comprises a plurality of active adsorbent containing permeable bags (2) arranged in close proximity to each other.

2. Filter system according to claim 1, wherein the layer (11) comprises a diffuser (4) for spreading the gas flow and carrying the active adsorbent.

3. Filter system according to claim 1, wherein the filter module (1) comprises a plurality of layers (11) and a cavity (5) separating the layers for equalizing the gas pressure between the layers.

4. Filter system according to claim 1, wherein the layer (11) is arranged perpendicular to the gas flow (6).

5. Filter system according to claim 1, wherein the filter module (1) comprises a second diffuser (9) for spreading the gas flow and holding the active adsorbent layer.

6. Filter system according to claim 1, wherein the bags (2) comprise a woven tissue.

7. Method of adsorbing an odour from a gas flow of an industrial process comprising a filter module (1) with a layer (11) containing active adsorbent (3), characterized by arranging the layer (11) perpendicular to the gas flow (6), filling the active adsorbent (3) in a plurality of permeable bags (2) and assembling the plurality of bags (2) in close proximity to each other on the layer (11).

8. Method according to claim 7, wherein the method further comprises providing a plurality of layers (11) of active adsorbent containing bags (2) and forming between two layers (11) a cavity (5) for smoothing the gas pressure between the layers.

9. Method according to claim 7, wherein the permeable bags (2) is formed of a woven tissue.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features and advantages of the present invention will become more apparent to a person skilled in the art from the following detailed description in conjunction with the appended drawings in which:

[0029] FIG. 1 is a section of a filter module according the invention,

[0030] FIG. 2 is a section of a second embodiment of the filter module having a horizontal gas flow according to the invention, and

[0031] FIG. 3 Is an embodiment of a filter module according to the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

[0032] A filter module 1 according to FIG. 1 is arranged to clean a horizontal gas flow 6. The module comprises a plurality of bags 2 containing an active adsorbent 3. The bags are closely arranged side by side in a layer 11 between a first and second wall 7 of the filter module 1 on a diffuser 4 such that the gas flow must pass the active adsorbent containing bags. The diffuser comprises a bag carrying sheet with a plurality of passageways for the gas flow. The function of the diffuser is to evenly distribute the gas flow in order to provide a smooth pressure profile and thus a uniform gas flow. The diffuser is placed on brackets 8 on the walls 7 of the filter module.

[0033] In the embodiment shown in FIG. 1 there are two layers 11 of active adsorbent bags. Between the two layers of bags there is formed a cavity 5. This cavity helps the gas flow to a uniform passage of the filter module. The gas having passed the first active adsorbent layer will be spread out and building up an even pressure profile towards the next active adsorbent layer. The probability of each gas molecule to reach an active adsorbent particle is thus increased. By the contact with an active adsorbent particle the odour carried by the gas will be adsorbed by the active adsorbent.

[0034] An embodiment of the filter module is shown in FIG. 2. In this embodiment all figure designations are the same but the gas flow is horizontal. The active adsorbent containing bags are in this embodiment piled in a layer 11 between a first diffuser 4 and a second diffuser 9. In this embodiment the bags are piled vertically between a wall of the filter module and a lid 10 which tightly is enclosing the filter module. Care must be taken to achieve a fully compacted layer of active adsorbent such that no escapeways for the gas arise around the active adsorbent layer.

[0035] A filter module 1 being a part of a filter system according to an embodiment of the invention is shown in FIG. 3. The filter module 1 comprises a frame 14 including a first diffusor 4. In the embodiment shown the first diffusor comprises a perforated sheet of metal. However any kind of stiff device capable of withstanding pressure yet allowing gas to pass would be sufficient. The frame 14 is arranged to receive a plurality of permeable flexible containers 2 keeping active adsorbent 3. In the embodiment shown the flexible containers comprises bags of active adsorbent such as active carbon. The bags are positioned closely side by side in the frame.

[0036] To hold the bags in position the filter module comprises a second diffusor 9 in the form of a grid. In the embodiment shown the grid is hinged on one side of the frame and locked on the opposite side by a locking mechanism 15. For convenient handling of the bags the plurality of bag aimed for the frame is fixed to a backbone 12 bendable along a curve 13. The backbone must be stiff enough to hold the bags in position and simultaneously capable of letting the air pass. One suitable backbone material is a mech of stiff fibers. In an embodiment of the invention the frame 14 is turned into a horizontal position when the bags are mounted. When finished and closed by the grid 9 it is raised into a vertical position and mounted in the filter module.

[0037] Although favorable the scope of the invention must not be limited by the embodiments presented but contain also embodiments obvious to a person skilled in the art. For instance the bag material may comprise a woven cloth or a metal net. All material capable of holding the activated adsorbent and yet letting the gas flow through may be acceptable. The layer of active adsorbent bags may comprise bags of different sizes and shapes. Each layer may comprise a plurality of layers of active adsorbent bags. The adsorbent may comprise any material that is capable of adsorbing odour or poisonous gas particles.