EP1308212A2 - Wet electrofilter - Google Patents

Abstract

Tubular bundle receiving device consists of several precipitating tubes (2) connected to an upper supporting plate (3) having passages corresponding to the tubes and a flange collar hanging in a supporting frame and/or a housing. <??>Preferred Features: A further supporting plate (4) is arranged at a distance of 300-500 mm from the first supporting plate and welded to the precipitating tubes. Several guide plates are arranged along the tubes and are fixed by locking elements. The guide plates have an enlarged passage opposite the tubes so that sufficient play is present.

Description

The invention relates to a wet electrostatic precipitator, in particular for separation of sulfur oxides and dusts from exhaust gases, consisting of several Rain pipes equipped with earthing means, the Rain pipes at least on one end openings in the Have pipe interior and designed to be suspended in a receiving device is.

Wet electrostatic precipitators are preferred for use in flue gas systems Separate sulfur oxides and dusts from the exhaust gases. The wet electrostatic precipitators consist of a bundle of preferably Plastic pipes through suitable sleeves and guide rings being held. An electrode runs in the middle of each tube, whereby in the operation of the filter the inner walls of the pipes with a flowing electrical conductive washing liquid and between the electrode and a strong electric field is formed on the wall of the tube. By the electrical field, the exhaust gases are ionized, making them electrical be charged and following the electrical field lines to the pipe walls hike. There the loaded exhaust gas particles are washed by a washing liquid recorded and transported to the outside via the pipe ends. Due to the high electrical field, it is to avoid electrical Breakdowns required that the pipes are grounded.

DE 41 02 732 A1 discloses precipitation tube bundles in which the individual pipes are glued together on their outer walls and each Tube at its two ends from the outside by an electrically conductive tape is enclosed as an earth conductor. In the wall of the pipe below the conductive tape are arranged through holes that the Connect the conductive tape to the inside of the pipe. Has turned out to be disadvantageous proved that the individual pipes cannot be exchanged or can only be carried out with a lot of work.

DE 198 33 226 A1 is also a precipitation tube bundle for Wet electrostatic precipitator is known in which for the pipe grounding in every rain pipe an upper ground as an inner ground and a lower ground that goes into the Surface of the downpipe is welded in, is present. The Individual earthing points of the pipes are electrically connected to each other connected. The internal grounding consists, for example, of a polypropylene injection molding ring with four graphite inserts and a graphite foil coating, while the lower ground is made of a carbon cord or a Carbon tube is made. In practical use, however, it has been shown that the interchangeability of the downpipes is not as desired Scope is feasible. With glued honeycomb bundles, an exchange is done not feasible and only limited with welded honeycomb bundles possible.

In compact bundles, it is also commonly known as braided coal and Use graphite straps or hoses that are grounded. In this version, especially with ironed graphite strips, step Possible assembly damage or tread damage, especially in the upper area with repeated inspections of the rain tube bundle. hereby unstable electrical properties of the carbon fibers used arise, that no longer guarantee proper earthing. For safe grounding the rain tube bundle will also be platinum wires around the outer tubes led around and welded on, but here is due to the high Platinum price an increased risk of theft and beyond that can thin Platinum tape can also be damaged during assembly.

The known solutions for fastening the rain pipes go for example from a support ring, which is also attached to the outside Pipes is welded. The middle area of the tube bundle is accordingly insufficient due to the mutual support available secured against changing loads, so that the Rain tube bundle damage can occur. In another Execution, the individual rain pipes are spaced to the extent that additional cross struts can be used between the rain pipes can. This, however, reduces the effective cross-section that can be used.

The invention has for its object a simple cross-section to demonstrate a homogeneous earthing system, which reduces the risk of Excludes transport damage or inspection damage and allows a repair through a relining tube. Furthermore, the invention is the The task is to attach a rain tube bundle to show what the risk of transport damage or inspection damage largely excludes and also a large free cross section of the precipitation tube bundle is available.

According to the invention, to solve the first-mentioned object, it is provided that several individual earthing elements are provided, which are distributed around the circumference the rain pipes are arranged and in the existing breakthroughs protrude, the arranged in the middle of the rain pipes Earthing elements at least two adjacent rain pipes Connect them electrically.

Further advantageous embodiments result from the subclaims.

The grounding elements can be on one end side, preferably on both End sides, be arranged, the grounding elements to the shape of the Breakthroughs are adjusted in height and width to the extent that the Breakthrough is almost completely closed. The Breakthroughs of Rain pipes are located in the cylinder surface at 60 ° each offset to each other and preferably extend to the front of the rain pipes. In a first embodiment, the earthing system consists of individual earthing elements made of round or polygonal earthing connectors, which in the existing breakthroughs of the rain pipes protrude and are electrically connected together. A single one Earthing connector can advantageously in the middle of the Rain pipes two or possibly three pipes electrically conductive with each other connect. The rain tube bundle is preferably installed in the Form that initially individual rain pipes through an upper support plate and a lower guide plate assembled into a bundle and welded with one or more guide plates in Dependence on the length of the precipitation tube bundle in the middle area be used. It is advantageous here that the individual tube bundles are made of protrude the upper support plate and lower guide plate if necessary and have a short protrusion, which has the necessary breakthroughs for the grounding elements in which the grounding elements between the individual rain pipes. This can at least in upper area of the precipitation tube bundle or in the lower Area happen. However, there is a possibility that in the lower area a conventional known earthing technique is used because there Risk of inspection damage is extremely low while in the upper area the rain tube bundle is suspended with its support plate, which is in turn covered by an end plate, which also serves as a Commit is provided. A major advantage of this invention Execution further consists in that the earthing system is also only open the construction site can be assembled so that transport damage or assembly damage before the first electrical connection.

A particular advantage results from the fact that no fibrous structures be used due to material stress or transport damage no longer serve their actual purpose of electrical contacting can. The earthing elements preferably consist of round or polygonal, for example approximately triangular, ground connectors, the edge surface of the grounding elements three concave partial surfaces have, which in the corresponding breakthroughs of the rain pipes protrude and thus a large earth connection within the Form precipitation tube. The concave protruding into the breakthroughs Partial surfaces of the earthing elements can be flush with the inner surface or be arranged backwards. The earthing elements are preferably made Made of pressed carbon (graphite), which is an excellent electrical Has conductivity. Alternatively, there is the possibility that a carrier material is coated with carbon.

In a further embodiment of the invention it is provided that two neighboring ones Earthing connector through one or more electrically conductive connection strips, preferably carbon strips, carbon rods or composite strips from a homogeneous carbon layer with a chemical and thermally resistant carrier layer or a compact carrier layer with a C-fiber reinforced matrix made of carbon or fluoroplastic, are connected, the connecting strips in incisions of the grounding elements are held jammed or the carbon rods over Earth gravity form the contact. The carbon or graphite used has excellent electrical properties on the one hand and is on the other hand, homogeneous and flexible, while the connecting strips for permanent bending strength are designed so that the connecting strips break be avoided. The connecting strips are in a first embodiment of the earthing system for the electrically conductive connection of individual Grounding elements are provided, with at least one or more connecting strips two adjacent earthing elements with each other can connect. The connecting strips are cut into Earthing elements are held clampable and thus lead to a safe Contacting. Alternatively, there is the possibility that several earthing elements through an electrically conductive front end plate are connected, which on the outer side surfaces of the grounding elements comes to rest. The end plate can be made of a carrier material and an elastically glued carbon layer, so that also with Sufficient step resistance is given for subsequent ascents.

The particular advantage of the execution of an earthing system according to the invention is that a repair of broken rain pipes inside a tube bundle in the installed state if necessary can be. A repair may be necessary, for example, if due to overheating due to electrical breakdown hot flue gas strands are formed within the rain tube. Here, for example, there is the possibility that a defective pipe through a to repair so-called Reliningrohr, the Reliningrohr in the existing pipe can simply be inserted and corresponding Breakthroughs for the grounding elements. The grounding elements can in the event of repairs with earthing elements adapted to the relining tube longer, protruding protrusions are replaced.

In a special embodiment of the invention it is provided that the grounding elements consist of an electrically suffering end plate, the concave corresponding to the breakthroughs of the rain pipes have trained projections. This version is based on individual Grounding elements are dispensed with and instead an electrically conductive end plate used by trained appropriately concave Protrusions protrude directly into the openings in the rain pipes and thus ensure adequate grounding. Similar to the grounding elements are the projections to the dimensions of the Breakthroughs adjusted so that they are almost completely closed and due to their concave formation, a flush degree form inside the rain tube. The end plate can be made from a carrier material and an elastically glued carbon layer exist, with the carbon layer facing the rain pipes, or else it can advantageously be avoided by grounding alone Damage to a sandwich construction can be used, which is an end plate with a middle carbon layer and two outer carrier layers having. This embodiment is characterized by particularly high Kicking properties and enables repeated walking on the Rain tube bundle without the corresponding damage can occur. The end plate is constructed so that the space between the individual rain pipes is completely covered while on the other hand, the clear opening width of the rain pipes through appropriate Holes are kept clear so that the flue gases are led through can. The rain pipes themselves can consist of round pipes that are combined to form a structure that is as compact as possible.

To damage the wet electrostatic precipitator in the upper accessible area to solve the second problem, it is provided that the Rain pipes are connected at least to an upper support plate that breakthroughs corresponding to the precipitation pipes and has a flange collar which in a support frame and / or housing can be attached. Compared to a support ring is a to increase stability Carrier plate used, the total weight of the tube bundle absorbs and also with the appropriate dimensioning the forces in Introduce the existing housing or the support frame directly can, and also additional forces caused by walking through the rain tube bundle may occur. Because the individual rain pipes are connected to the support plate is a self-supporting Construction created, the tube walls by welding are supported. The load to be absorbed is therefore not Rainpipe transferred to rainpipe, but total of the support plate and the individual rain tube are merely connected to it individually so that the rain pipes in the intended Position held securely and also no additional burden are exposed.

To further increase the load-bearing capacity of the rain tube bundle and a To rule out possible deflection is a further advantageous embodiment the invention provided that a second upper support plate is present is preferably at a distance of about 300 to 500 mm to the first Support plate is arranged and also connected to the rain pipes, welded, for example. Through the second support plate, which however the upper one is not cantilevered on the support frame and housing End area of the rain pipes used for stiffening, the individual rain pipes and the two spaced support plates have a construction-reinforcing effect and function as a double T-beam fulfill, so that an extremely high inherent stability is achieved. To For this purpose, the upper first and second support plate with the Rain pipes welded. For better handling and fastening of the individual precipitation pipes in the tube bundle is advantageous provided that the rain pipes against the top first Protrude support plate, lock flush or reset and with connected to the support plate, for example welded. Through the different arrangements of the precipitation pipes compared to the upper one Support plate there is the possibility of a flat or obtuse-angled welding depending on the necessary arrangement.

To fix the rain pipes at a defined distance from each other and that over the entire length of the tube is in a further advantageous embodiment the invention provided that several along the rain pipes Guide plates are arranged, the distance between them is determined by spacer bars with the guide plates facing the rain pipes have increased breakthrough, so that sufficient play is present and therefore no tension between the guide plates and the rain pipes can arise. For sufficient attachment the guide plates are several spacer bars in the tube bundle distributed between the rain pipes. Through the spacer bars the guide plates and the second support plate thus become one Recording system connected, in which the individual rain pipes free suspended and only with one or both of the upper support plates are connected. This can advantageously in the event of temperature fluctuations by streaks of temperature the resulting from it Changes in the length of individual rain pipes can be absorbed.

Alternatively, instead of the spacer bars, locking elements, for example Pawls and recesses welded to the rain pipes in the openings of the guide plate, which are provided for provide sufficient hold and allow enough room for movement.

In a further special embodiment of the invention it is provided that a preferably parallel one above the first support plate End plate is attached and screwed to the first support plate, whereby the end plate as well as the support plate for the rain pipes has aligned breakthroughs, which rounded off to the outside are executed. The upper end plate is practically on the support plate attached and is screwed to it, so that with a possible Do not inspect the supporting plate underneath and the rain pipes can be damaged. Here are the openings of the end plate somewhat larger than the inner areas of the rain pipes, so that at least the end plate on the end faces of the rain pipes partially rests. This measure will result in a large circulation of the End plate achieved on the rain tube bundle, so that on the one hand the The forces that occur are introduced directly into the upper support plate can and on the other hand by the partial support of the end plate on the Rainwater pipes have extensive support. To compensate of possible structural tolerances between the first support plate and the End plates are provided in the further spacers, which at least in the area of the bolts around the existing ones Holes are arranged around.

In a further particular embodiment of the invention it is provided that the Rain pipes in the lower area have at least one flange piece, that opposite the face of the rain pipes by the plate thickness a lower clamping plate set back and with the rain pipes connected, for example welded. The provided Flange pieces are directly with the ends of the rain pipes connected, for example welded, and further serve for suspension and stabilization of the lower end plate by the clamping plates, the clamps used the rain pipes similar to that Pick up guide plates for positioning. Through this special The design of the end areas is a change in the length of individual precipitation pipes due to local heating due to hot gas streaks with a Expansion downwards possible due to the flexibility of the clamping system. To this purpose lies on the upper and lower end faces of the flange parts one clamping plate each, which is connected to each other by several bolts are connected, one on the lower clamping plate via the screw bolt second end plate in parallel is further attached. The Clamping plates only have a small contact surface on the flange parts on, which are further distributed within the tube bundle so that a high Flexibility is given and a deflection of the clamping plates and the End plate is possible due to local heating. Therefore each precipitation tube preferably only has one flange part, which are also offset within the tube bundle. For further The lower clamping plate can increase flexibility through the end plate be replaced.

In an embodiment of the invention it is further provided that the Cleats corresponding openings to the precipitation pipes have, which are adapted to the outer dimensions of the rain pipes, so that the clamping plates can be pushed over the rain pipes and that at least one clamping plate has an enlarged breakthrough with play to the Has rain pipes. The second end plate points just like that first end plate has an opening which is rounded to the outside and which in in this case, however, it is adapted to the outside dimensions of the rain pipes, so that the end plate can also be pushed over the rain pipes. The lower clamping plate also points on the downward side Cutouts to allow further fasteners of the end plates can be taken up and in no direct contact with the Clamping plate stand. The aforementioned measures ensure that the rain pipes when heated by a local temperature streak are stress-free in the guide plates. About that in addition, the clamping plates and the lower end plate form an extreme flexible system, so that changes in length of the individual tubes to each other do not lead to tensioning of the entire rain tube bundle, but because of the existing plate thickness of the clamping plates and End plate these are deformable and thus length changes flexible be included.

In a further particular embodiment of the invention it is provided that the End plates as a sandwich plate with an inner and outer Plastic existing plate are formed and that between the Plastic plates have an earth layer made of a carbon layer is, preferably flexible carbon (graphite) is used or Carbon webs are used. The formation of the end plate As a sandwich plate, the main advantage is that the sensitive and limits flexible graphite layer between the outer ones Plastic layers are securely embedded. Any transport damage or Inspection damage to the top cover plate can occur in this way avoided or even excluded.

Furthermore, the manufacture of the end plates with the ground layer significantly simplified and also has the advantage that a subsequent Assembly on the finished rainwater tube bundle with a light Exchange can take place. In a first version of the end plates provided that the ground layer at least in sections up to to the edge of the openings and is flush with the top and bottom Plastic plate closes. Alternatively, there is a possibility that the Grounding layer formed over the entire edge area of the openings is. Both versions are due to the downward flowing Cleaning liquid ensures that adequate wetting for The rain pipes are grounded. The top and bottom end panels can optionally have the same or different openings. Alternatively there is the possibility that the lower and upper shown Embodiment are interchanged.

To avoid the occurrence of voltages in the ground layer, see in Another embodiment of the invention provides that the end plates in Area of the existing holes additional connecting elements, for example, have rivets that are distributed around the circumference of the bores are arranged and in the case of the lower end plate in the existing Recesses of the clamping plate come to rest.

The inventive design of a tube bundle receiving device thus enables a compact design of the rain tube bundle a large free cross section for the passage of the flue gases and thus the construction shown an improvement in efficiency. moreover an upper end plate secures this in a housing or frame suspended pipe bundles to the extent that an inspection at any time without the Risk of damage can occur. Due to the special type of Suspension is stiffened in the upper area, which ensures is that occurring tensile or compressive stresses are largely compensated become. In addition, local temperature differences with a Change in length of the rain pipes through the flexibly trained Clamping plates and the lower end plate added. Another The new grounding system, which based on a simple constructive solution a safe grounding without Allows contact problems. Existing manufacturing tolerances are in advantageously captured by an end plate that on the Rain pipes is designed to be pushed on.

A further explanation of the invention follows with the aid of the figures.

Figur 1

eine Seitenansicht eines Nasselektrofilters, bestehend aus mehreren zusammengefügten Niederschlagsrohren,

Figur 2

eine Draufsicht auf den Nasselektrofilter gemäß Figur 1,

Figur 3

eine geschnittene Draufsicht gemäß der Verbindungslinie A-A,

Figur 4

eine geschnittene Draufsicht gemäß der Verbindungslinie B-B auf eine Abschlussplatte mit erfindungsgemäßem Erdungssystem,

Figur 5

in einer vergrößerten Seitenansicht den Endbereich eines einzelnen Niederschlagsrohr mit oberen und unterem Erdungssystem,

Figur 6

ein einzelnes Erdungselement in einer Draufsicht,

Figur 7

ein weiteres Erdungselement ebenfalls in einer Draufsicht,

Figur 8

in einer Seitenansicht ein in einem Gehäuse beziehungsweise Rahmenelement eingehängtes Niederschlagsrohrbündel,

Figur 9

in einer geschnittenen vergrößerten Seitenansicht den oberen Eckpunkt zwischen einem Niederschlagsrohr und der Trag- und Abschlussplatte und

Fig. 10

in einer geschnittenen vergrößerten Seitenansicht einen unteren Eckpunkt zwischen einem Niederschlagsrohr mit unteren Klemmplatten und einer Abschlussplatte.

It shows:

Figure 1

FIG. 2 shows a side view of a wet electrostatic precipitator, consisting of several joined precipitation tubes

Figure 2

2 shows a top view of the wet electrostatic precipitator according to FIG. 1,

Figure 3

a sectional plan view according to the connecting line AA,

Figure 4

FIG. 2 shows a sectional top view according to the connecting line BB on an end plate with a grounding system according to the invention,

Figure 5

in an enlarged side view the end area of a single rain tube with upper and lower earthing system,

Figure 6

a single earthing element in a top view,

Figure 7

another grounding element also in a plan view,

Figure 8

a side view of a precipitation tube bundle suspended in a housing or frame element,

Figure 9

in a sectional enlarged side view the upper corner between a rain pipe and the support and end plate and

Fig. 10

in a sectional enlarged side view a lower corner between a rain pipe with lower clamping plates and an end plate.

Figure 1 shows a side view of a wet electrostatic precipitator 1, which consists of there are several individual rain pipes 2. The precipitation pipes 2 are executed round in the embodiment shown and are by a upper support plate 3 and a lower and middle guide plate 4.7 held. On there is also one at each end of the precipitation pipes 2 End plate 5.6. The upper support plate 3 and the lower and middle Guide plates 4, 7 are for fastening the individual rain pipes 2 provided with each other and will be after assembly with the Rain pipes 2 either glued or welded so that one The most compact design possible. The upper support plate 3 is in her Diameter and also the upper end plate 5 slightly larger than that Guide plates 4.7 formed so that the entire rain tube bundle suspended in a corresponding device with a flange collar 9 can be. The assembly is preferably carried out in a vertical position, so that the rising smoke gases through the inner diameter of the rain pipes 2 can escape. For mounting the earthing system and the End plate 5,6 the individual rain pipes 2 protrude above the upper one Support plate 3 or lower guide plate 4 and allow on the one hand the installation of the earthing system and, on the other hand, simple gluing or welding.

FIG. 2 shows a top view of the wet electrostatic filter 1 according to the invention of the individual rain pipes 2 and the upper support plate 3 and End plate 5 can be seen. Both the carrier plate 3 and the End plate 5 each have seven holes 8, which on the Inner diameter of the individual rain pipes 2 are adjusted. The opposite guide plate 4 or end plate 6 is also built up so that the flue gases through the rain pipes 2 can be directed.

Figure 3 shows in a sectional view along section line A-A Precipitation pipes 2 and the middle guide plate 7.

Figure 4 shows in a sectional view along section line B-B Rain pipes 2 and the lower end plate 5 with the invention Grounding system. To the individual rain pipes 2 is in each case an individual earthing element in the form of a Grounding element 10 is arranged, which by an opening of the Precipitation tubes 2, as can be seen particularly in FIG. 5, in the Interior protrudes and a ground contact to the inner surface of the rain pipes 2 manufactures. The middle grounding elements 10 each connect three adjacent precipitation pipes 2, while the outside partially connect only two precipitation pipes with each other or individual grounding elements 10 located on the edge only one Contact precipitation tube 2. Each individual grounding element 10 is included the adjacent grounding element 10 via a connecting strip 11 electrically connected, so that the entire grounding connector are homogeneously electrically conductively connected to one another and via corresponding Terminals can be grounded.

In a preferred production form, the grounding elements 10 directly between the precipitation pipes 2 on the upper support plate 3 or lower guide plate 7 fixed, for example temporarily glued and with provided the connecting strip 11, so that the end plates 5.6 placed on the tube ends of the precipitation tube bundle and can be attached. An attachment can, for example, by a Screw fastening done. Alternatively, you can do this instead the connecting strip the end plate 5,6 with an elastically glued Carbon layer is provided and so a direct electrically conductive Connection to the individual grounding elements 10 is made.

Figure 5 shows an enlarged sectional side view of the upper and lower end of a precipitation tube 2. The precipitation tube 2 is through the middle guide plate 7 and the upper support plate 3 and a lower one Guide plate 4 with the other precipitation tubes 2 of the wet electrostatic precipitator connected. A fastening between the rain pipe 2 and the support plate 3 or guide plate 4, 7 is made, for example, by a welded connection. The precipitation pipes 2 each have a rectangular end Breakthrough 12 in which the grounding element 10 with a concave Partial area 13 protrudes. The concave partial surface 13 is in this case on the inside diameter of the precipitation tube 2 adjusted so that on the inside a flush transition is created or the earthing elements slightly stand back from the inner surface of the pipe. Around each rain pipe 2 six grounding elements are arranged at the upper and lower ends which, as already stated, are connected to one another in an electrically conductive manner. The A particular advantage of this earthing system is that in the case of a Defect in a single rain tube 2 with no problems a little smaller relining tube can be inserted.

In an alternative embodiment, instead of individual grounding elements 10 an end plate consisting of a carrier material and a glued carbon layer can be used, the carbon layer has corresponding projections, which in the openings 12 of the Precipitation pipes 2 with concave partial surfaces flush or slight engage in a recessed manner in relation to the inner surface of the pipe. Possibly the end plate can also consist of a sandwich plate, the one has middle carbon layer with corresponding projections.

FIG. 6 shows, for example, the shape of an earthing element 10, which is made of pressed carbon (graphite). The grounding element 10 is almost round and has an angle of 120 ° a concave partial surface 13 which is flush within the precipitation pipes 2 or lies slightly back. So with one Earthing element 10 possibly up to three precipitation tubes 2 electrically conductive be connected to each other. Are between the concave partial surfaces 13 Projections 14 formed as anti-rotation, which an incision in shape have a slot 15 for the connecting strips 11. Alternatively there is the possibility of providing a hole or another angular recess. In the event that the contacting of the individual grounding elements 10 through A cover plate 5.6 with carbon coating can also be done round earthing elements, each with three concave surface 13 without connecting strips be used.

Figure 7 shows such a shape of the grounding element 20, which of its The shape corresponds to the grounding element 10 from FIG. 6, but none Has slits. This ground connector is related to carbon-coated end plates used, which over the flat contact the electrical homogeneous connection of the individual Manufacture grounding elements 20 with each other.

FIG. 8 shows a side view of a wet electrostatic precipitator 101, which consists of there is a plurality of individual rain pipes 102 that form a rain pipe bundle 109 are summarized. The rain pipes 102 are executed round in the embodiment shown and are by a first and second upper support plates 103, 104 and a plurality of guide plates 105, only one of which is shown, fixed at a distance from each other and by the upper support plates 103, 104 held. It is conceivable that instead of one round rain pipe also angular rain pipes used become. The upper support plate 103 is larger in diameter than that formed second support plate 104 and lies at least partially with its free End 106 on a bracket 107 of a housing or a support frame 108 on. On the upper support plate 103 is a after hanging End plate placed and screwed to it, such as from of Figure 9 can be seen. The attachment is also carried out in the lower area a lower end plate at the pipe ends, such as from Figure 10 can be seen. The top and bottom end plates can, like the lightning symbols indicate, be designed as a grounding plate at the same time. The two upper support plates 103, 104 are welded to the rain pipe 102, so over the rain pipes 102 and support plates 103, 104 a very stable supporting structure is present.

Figure 9 shows a sectional side view of the upper corner area between a rain pipe 102, the upper support plate 103 and an end plate 110. The support plate 103 is with the rain pipes 102 welded, as can be seen from a weld 111, 112, while the End plate 110 via a self-tapping screw 113, the protrudes through a bore 114 of the end plate 110 and into the upper Support plate 103 is screwed. To maintain a specified distance is between the upper support plate 103 and end plate 110 Spacer 115 provided. On the ends of the rain pipes 102 or the spacer 115, the end plate 110 rests, which is designed as a sandwich plate in the exemplary embodiment shown, namely, the end plate 110 consists of a lower and upper Plastic plate 116, 117 and a middle made of graphite Grounding layer 118. For screwing to the upper support plate 103 points the end plate 110 has a bore 114 through which the Bolt 113 is screwed into the support plate 103. To avoid of damage in the area of bore 114 are near or distributed in existing holes 119 rivets 120 used, the Stabilize the end plate 110 in the area of the holes 114. The end plate 110 also points in alignment with the precipitation pipes 102 each have an opening 121, which is slightly larger than that Internal dimension of the precipitation pipes 102 is formed and one towards the outside Rounding 122 has. In the area of the breakthrough 121 is therefore due the construction of the end plate 110, the ground layer 118 to brought up to the edge of the opening 121 and generated in the case of a Wetting with a washing liquid an earth contact. alternative there is the possibility of designing the end plate 110 so that it over the rain pipes 102 can be pushed on. The support plate 103 can be flush with the rain pipes compared to the shown mounting position 102 may be arranged or possibly in an elevated Position, with either the welds in the face or in Corner area are formed.

Figure 10 shows a sectional side view of the lower corner area between a rain pipe 102, two lower clamping plates 130, 139 and the end plate 131. The end plate 131 is again as Sandwich plate constructed and has two outer plastic plates 132, 133 that embed a middle ground layer 134. The attachment of the End plate 131 takes place via a screw bolt 135, which by a Bore 136 of the end plate 130 and a bore 137 of the clamping plate 130 screwed into a further bore 138 of the clamping plate 139 is. The end plate 131 has a plurality of openings 140, which, however, are shown in FIG adapted in this case to the outside diameter of the precipitation pipes 102 are so that the end plate 131 is pushed over the rain pipes can be. The end plate 131 is in the area of the opening 140 also provided with a rounding 141. Around the bores 136 are further holes 142 are provided, in each of which a rivet 143 is inserted is to stabilize the end plate 131 in the area of the holes 136 is provided.

This means that it is independent of the temperature development of the precipitation pipes 102 A flexible length adjustment can be made, the lower area is elastic trained so that no tension between the upper and lower Area arise. In this case, there is in each case one of the precipitation pipes 102 Flange part 144 welded on. The flange 144 is directly connected to the Rain tube 102 connected by a weld 145 and has one upper and lower end faces 146, 147 to the respective clamping plates 130, 139 issue. The two clamping plates 130, 139 have aligned openings 148, 149 to the rain pipes, so that these also over the Downpipes 102 are slidable and abut against flange 144 reach. In the exemplary embodiment shown, the opening 149 is somewhat larger than the opening 148, so that a game between the Clamping plate 139 and the precipitation tube 102 are formed. The two Clamping plates 130, 139 are screwed over in such a way in 135 clamped that they are pressed against the end faces 146, 147 and can also be used to hold the end plate 131. In order to the rivets 143 do not come into contact with the lower clamping plates 130 In the exemplary embodiment shown, this has a triangular cutout 150 on. Due to the sandwich structure of the lower end plate 131 again the ground layer 134 to the edge of the opening 140 introduced and it is therefore due to a downward flowing Washing liquid a wetting of the ground layer 134 and thus the Establishing an earth contact. The shown earthing system draws is particularly characterized in that a subsequent installation on the Rain tube bundle 109 made and thus also a lighter Exchange of possibly damaged end plates 110, 131 is unproblematic can be carried out. In particular, the end plates 110 need 131 only to be screwed on at the end of assembly, causing damage excluded during transport or during assembly can be. In addition, the earthing system of this type stands out through the grounding layer between two plastic plates extends to the edge of the openings and thus a large area Earthing contact for each individual rain pipe 102 allows. Through the larger openings 140 of the lower end plate 130 can very well Manufacturing tolerances are balanced, with the design details in the the upper and lower areas are identical or, if necessary, interchanged can be.

LIST OF REFERENCE NUMBERS

1

Wet Electrostatic Precipitator

2

Precipitation tube

3

upper support plate

4

guide plate

5

End plate

6

End plate

7

guide plate

8th

drilling

9

flange collar

10

grounding element

11

connecting strips

12

breakthrough

13

subarea

14

head Start

15

incision

20

grounding element

101

Wet Electrostatic Precipitator

102

Precipitation tube

103

support plate

104

support plate

105

guide plate

106

The End

107

console

108

supporting frame

109

The precipitation tube bundle

110

End plate

111

Weld

112

Weld

113

bolts

114

drilling

115

spacer

116

Plastic plate

117

Plastic plate

118

ground layer

119

drilling

120

rivet

121

breakthrough

122

curve

130

clamp

131

End plate

132

Plastic plate

133

Plastic plate

134

ground layer

135

bolts

136

drilling

137

drilling

138

drilling

139

clamp

140

breakthrough

141

curve

142

drilling

143

rivet

144

flange

145

Weld

146

face

147

face

148

breakthrough

149

breakthrough

150

recess

Claims (20)

Wet electrostatic precipitator (1,101), in particular for the separation of sulfur oxides and dusts from exhaust gases, consisting of several rain pipes (2,102), which are equipped with earthing means, the rain pipes (2,102) having openings (12) at least on one end side in the pipe interior and in one Receiving device are designed to be hookable,
characterized in that several individual earthing elements (10, 20) are provided, which are arranged circumferentially distributed around the rain pipes (2, 102) and protrude into the existing openings (12), the earthing elements (10) arranged in the central region of the rain pipes (2, 102) , 20) connect at least two adjacent precipitation pipes (2, 102) in an electrically conductive manner. Wet electrostatic precipitator according to claim 1,
characterized in that the openings (12) in the cylindrical surface of the precipitation pipes (2,102) are arranged offset by 60 ° in each case and / or that the openings (12) extend to the end face of the precipitation pipes (2,102). Wet electrostatic precipitator according to claim 1 or 2,
characterized in that the grounding elements (10, 20) consist of round or polygonal, for example approximately triangular, grounding connectors, the edge surface of the grounding elements (10, 20) having three concave partial surfaces (13) which extend into the corresponding openings (12) in the Protrusion tubes (2,102) protrude. Wet electrostatic precipitator according to claim 1, 2 or 3,
characterized in that the grounding elements (10, 20) or grounding connectors consist of pressed carbon (graphite) and / or that the carbon is glued to a carrier material. Wet electrostatic filter according to claim 4,
characterized in that two adjacent earthing elements (10, 20) are reinforced by one or more electrically conductive connecting strips (11), preferably carbon strips, carbon rods or composite strips made of a homogeneous carbon layer with a chemically and thermally resistant carrier layer or a compact carrier layer with a C-fiber Carbon or fluoroplastic matrix. Wet electrostatic filter claim 5,
characterized in that the connecting strips (11) are held in incisions (15) in the grounding elements (10, 20). Wet electrostatic precipitator according to one or more of claims 1 to 6,
characterized in that a plurality of earthing elements (10, 20) are connected to one another by an electrically conductive end plate (5, 6, 110, 131) which comes to rest on the outer side faces of the earthing elements (10, 20) or that the earthing elements (10, 20) consist of an electrically suffering end plate (5, 6, 110, 131), which have concave projections that correspond to the openings (12) of the precipitation pipes (2, 102). Wet electrostatic filter according to claim 7,
characterized in that the end plate (5,6,110,131) consists of a carrier material and an elastically glued-on carbon layer, the carbon layer facing the grounding elements (10, 20) for electrical contacting, the end plates being made in sandwich construction, a middle carbon layer and two outer layers Have backing layers. Wet electrostatic precipitator according to one or more of claims 1 to 8,
characterized in that the concave partial surfaces of the earthing elements (10, 20) protruding into the openings (12) are flush or recessed to the inner surface of the rain pipes (2, 102), the rain pipes (2, 102) consisting of round pipes which are combined to form the most compact structure possible are. Wet electrostatic precipitator according to one or more of claims 1 to 9,
characterized in that the rain pipes (2,102) are connected at least to an upper support plate (3,103) which has openings (121) corresponding to the rain pipes (2,102) and a flange collar which can be suspended in a support frame (108) and / or housing is. Wet electrostatic filter according to claim 10,
characterized in that a second upper support plate (104) is provided, which is preferably arranged at a distance of approximately 300 to 500 mm from the first support plate (3,103) and is also connected, for example welded, to the rain pipes (2,102), and that the rain pipes (2,102) protrude from the upper first support plate (3,103), are flush or set back and connected to it, for example welded. Wet electrostatic precipitator according to claim 10 or 11,
characterized in that a plurality of guide plates (7, 105) are arranged along the rain pipes (2, 102), the spacing of which is determined by spacer bars or, compared to the rain pipes (2, 102), by locking elements, for example pawls welded to the rain pipes (2, 102) and recess in the openings in the guide plates (7.105). Wet electrostatic precipitator according to claim 10, 11 or 12,
characterized in that the guide plates (7, 105) have an enlarged opening compared to the rain pipes (2, 102), so that there is sufficient play and that the spacer bars in the tube bundle are distributed between the rain pipes (2, 102) and that the second support plate (104) and the adjacent guide plate (7, 105) and the guide plates (7, 105) are interconnected, for example welded, by spacer bars or locking elements. Wet electrostatic precipitator according to one or more of claims 10 to 13,
characterized in that a preferably parallel end plate (5,6,110,131) is placed above the first support plate (3,103) and screwed to the first support plate (3,103) and in that the end plate (5,6,110,131) as well as the support plate (3,103) are connected to the Rain pipes (2,102) have aligned openings (121), which are rounded to the outside. Wet electrostatic precipitator according to one or more of claims 10 to 14,
characterized in that the openings (121) of the end plate (5,6,110,131) are somewhat larger than the inner regions of the rain pipes (2,102) and the end plate (5,6,110,131) at least partially rests on the end face of the rain pipes (2,102) and that between the first support plate (3,103) and the end plate (5,6,110,131) spacers (115) are arranged. Wet electrostatic precipitator according to one or more of claims 10 to 15,
characterized in that the rain pipes (2, 102) have at least one flange part (144) in the lower region, which is set back from the face of the rain pipes (102) by the plate thickness of a lower clamping plate (130) and connected to the rain pipes (2, 102), for example is welded, and that on the upper and lower end faces (146, 147) of the flange parts (144) there is in each case a clamping plate (130, 139) which are connected to one another via a plurality of screw bolts (135), one on the lower clamping plate via the screw bolt (135) (130) is attached to the second end plate (6, 131) lying in parallel, the lower clamping plate (130) being replaceable by the end plate (6, 311) and the clamping plates (130, 139) having openings (148, 149) corresponding to the rain pipes (2, 102) the outside dimensions of the rain pipes (2,102) are adjusted so that the clamping plates (130,139) over the never the blow pipes (2, 102) can be pushed and that at least one clamping plate (139) has an enlarged opening (149) with play to the rain pipes (2, 102). Wet electrostatic precipitator according to one or more of claims 1 to 16,
characterized in that the second end plate (6, 131) has an outwardly rounded opening (140) which is adapted to the outer dimensions of the rain pipes (2, 102), so that the end plate (6, 311) can be pushed over the rain pipes (2, 102) and that the lower one Clamping plate (130) has cutouts (150) for further fastening means of the end plate (6, 131). Wet electrostatic precipitator according to one or more of claims 1 to 17,
characterized in that the end plates (6, 311) are constructed as a sandwich plate with an inner and outer plate (116, 117, 132, 133) made of plastic and that between the plastic plates (116, 117, 132, 133) there is an earth layer (118, 134) made of a carbon layer, preferably elastically pressed carbon ( Graphite) is provided. Wet electrostatic precipitator according to one or more of claims 1 to 18,
characterized in that the grounding layer (118, 134) extends at least in sections to the edge of the openings (121, 140) and is flush with the upper and lower plastic plate (116, 117, 132, 13) or that the grounding layer (118, 134) extends over the entire edge region of the openings (121, 140) is trained. Wet electrostatic precipitator according to one or more of claims 10 to 19,
characterized in that the end plates (6, 131) in the area of the existing bores (118, 145) have additional connecting elements, for example rivets (120, 143), which are arranged circumferentially distributed around the bores (114, 136) and in the case of the lower end plate (6, 131) come to rest in the existing recesses (150).

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