DK175748B1 - Assembly is between filter steel housing and concrete foundation structure and comprises intervening mechanical supporting part in electric filter or bag filter - Google Patents

Abstract

The assembly is between a filter steel housing (1) and a concrete foundation base (2) and comprises an intervening mechanical supporting part in an electric filter or a bag filter. It comprises a number of layers (3) between the housing and the concrete and of a slide seal (4) between the lowest edge of the filter housing wall (5) and the concrete foundation upper edge. The supporting structure can be provided with base beams (6) which rest on the layers. The steel filter housing wall (7) and the concrete foundation slide surfaces (8) are formed as horizontal surfaces with elastic seal. The sealing part of the assembly is formed with horizontal surfaces of flat iron. The uppermost iron (7) is welded to the filter wall lowermost edge and the lowermost iron is moulded into the concrete foundation upper edge.

Description

in DK 175748 B1

This invention relates to a gas-tight mechanical joint between a steel housing and a concrete floor in an electro filter or a bag filter. Such joints between steel and concrete are needed where the structure is heated to such high temperatures that there is a risk of cracking due to the difference in thermal time constant and thus in the temporal expansion of the two materials.

The invention applies to filters that repel aggressive flue gases where there is a high risk of corrosion in the filter bottom, for example, filters that dust the flue gases from a soda boiler at a paper mill.

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Previously, both the filter housing and the bottom funnel have been constructed of concrete, but since concrete work is man-made, since formwork must be manufactured and casting must be carried out in situ, a requirement has arisen that so much of the filter must be assembled from steel in a workshop and only the bottom funnel must be built in concrete on site.

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Therefore, attempts have been made to design the joint between the housing and the bottom funnel so that cracking does not occur by making the joint flexible. However, one of the main problems is that in addition to being flexible, this assembly must also transfer large forces between the housing and the bottom funnel, e.g. static forces from the gravity and dynamic forces from a 20 earthquake, as well as compressive forces.

In Japanese Patent No. 63156555, the entire filter housing is made of concrete elements which, with clearances and gaskets between concrete beams and concrete slabs, can expand thermally, thus avoiding cracking. These concrete elements are manufactured in a workshop and assembled like a 25 element building.

In U.S. Patent No. 6,440,199, the crack risk in an steel filter and concrete floor electrofilter has been attempted to be removed by attaching the walls to the support structure with relatively flexible joints. The walls and the supporting structure are attached rigidly to the bottom funnel 30 by molding, but otherwise allow movement between them. However, it is questionable whether the partially flexible and partially rigid joints can completely counteract thermally caused cracks.

The present invention aims to provide a joint constructed from a principle of completely separating the load bearing steel structure from the sealing joint between steel walls and concrete floor so that the expansion difference is absorbed without the risk of cracking. This is achieved by the characterizing part of claim 1, i.e. in that the supporting parts for the structure, a number of sliding or roller bearings, are completely separated from the seal, where the mechanical stresses are very small.

The invention will be described in further detail below with reference to the accompanying drawings, in which: Figure 1 shows a cross-section of filter housing and bottom funnel as an example of the given invention; Figure 2 shows sealing details for a sealing cord seal; Figure 3 shows sealing details for a seal using a packing cord; and

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Figure 4 shows sealing details for a seal using sealant. IN

Figure 1 shows an example of a cross-section of the steel structure's supporting structure with roof beams (12).

columns (13) and bottom beams (6). The joint between the steel housing and the concrete floor is an I

In a mechanical bearing part between the steel housing (1) and the concrete bottom funnel (2) consisting of a number of bearings I

(3) between the filter housing and the concrete, and of a sliding seal (4) between the walls of the filter housing (5)

At the bottom edge and the top of the concrete floor. <I

In Figure 2, the supporting assembly (3) and the sealing assembly (7, 8, 9) are shown in magnification. IN

The support bed (3) between a bottom beam (6) and the top of the concrete (2) is shown here as an

roller bearing (3), but it can also be a slide bearing with e.g. PTFE. You see the wall (5) that you

You end up here in a horizontal flathead (7) which together with the flathead embedded (8) and I

the gasket (9) creates a gas-tight, flexible assembly. IN

In Figure 3, a first embodiment of the seal is shown, in which a steel rail welded to the flat member (7)

I (10a) forms a restraint for the packing cord (9) which is pressed against the steel rail (10a) by an I

In angular body (10b) by means of the bolts (14). IN

Figure 4 shows another embodiment of the seal where a sealant (11) is pressed into

In between the flats (7) and (8). The joint is made of a suitable elastic material with a suitable I

In joint widths which limit the bending forces in the wall (5) so that the mechanical stresses do not

You exceed the crack voltage limit. IN

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Claims (5)

A mechanical assembly between a filter steel housing (1) and a concrete bottom funnel (2) in an electrical filter or a bag filter characterized in that it comprises a plurality of bearings (3) between the filter steel housing and the concrete bottom funnel and a seal (4) between the lower edge of the filter steel housing 5 and the upper edge of the concrete floor. A mechanical assembly according to claim 1, characterized in that the filter steel housing is provided with bottom beams (6) which rest on bearings (3), which in turn rest on the edge of the concrete floor funnel (2), and wherein the filter steel housing slides the walls and concrete floor funnel (7). , 8) I0 is designed as horizontal surfaces with elastic seal (9, 11). A mechanical joint according to claim 2, characterized in that the horizontal sealing surfaces consist of flat dams, the upper iron (7) welded to the lower edge of the filter steel housing wall and the lower iron (8) embedded in the upper edge of the concrete floor funnel. 15 A mechanical assembly according to claim 2, characterized in that the seal is an elastic packing cord (9) which is pressed against the horizontal flat members with a tightening mechanism (10a, 10b, 14). 20 A mechanical joint according to claim 2, characterized in that the seal comprises a sealant (11) which is pressed in between the flat members. J