DE1526922A1 - Steam generator with flue gas duct - Google Patents

Description

Sulzer Brothers Aktiengesellschaft, Winterthur / Switzerland Steam generator with flue gas duct

The invention relates to a steam generator with a flue gas duct, the walls of which are covered with pipes and in addition Tube bundles are housed, between which accessible spaces are provided.

In known steam generators of this type, it is common to get to the Carry out tube bundles inspections and, if necessary, repairs can be closable in the side walls of the flue gas pass at the level of the space located between two tube bundles Provide access openings. These manholes are very expensive, since the pipes lining the wall are in the area of this Openings require a special shape. Another disadvantage consists in the fact that the entry openings close Doors pose a hazard by creating the seal between Entry opening and door can easily leak "

It is also known a waste heat boiler in the vertical annulus between the Kessei outer jacket and the jacket of a central one climbable empty manhole a pipe divided into groups

σ bundle together with a ring distributor and a ring collector as well as with

these associated dividers and sub-collectors for each group oo

^ ■ -, with all distributors and all collectors below or

o are located above the tube bundle. Around the tube groups of the bundle ο

*** - ■ being able to install and remove individually, are the walls of the empty chess ■ ro ;. ■■■ -.

tes removably attached. After taking out a wall and

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after cutting the connecting lines between the ring distributor and sub-distributors as well as between ring collector and sub-collector the pipe group in question can first be moved sideways into the empty shaft and then lifted out of it. This design the waste heat boiler has nothing to do with the object on which the invention is based or with the claimed solution to do.

^ The invention is based on the object of a steam generator To create the type mentioned at the beginning, in which the tube bundles housed in the flue gas pass can be accessed without the use of entry openings in the walls of the flue.

According to the invention, this object is achieved in that in the flue gas duct, parallel to its pipe-covered boundary walls, a Tube bundle penetrating through shaft is provided, the each has an opening at the level of the accessible room and which is designed so that the flue gas can flow through is avoided by the shaft.

By the novel by Stieg shaft, avoiding the boundary walls of the flue gas train by breaking entry openings and the special pipe constructions side, the otherwise provided in the region of the manholes müMen. A cost-saving production of the pipe cladding of the flue gas pass walls is thus possible. This advantage has a particularly favorable effect when the pipes lining the flue gas duct are welded to one another in a gas-tight manner. Another advantage of the invention can be seen in the fact that none in the flue gas pass walls

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Leaks can occur more. Because the special shape the tube is avoided, no more disturbances occur due to additional tension - due to different elasticity Behavior of the pipes - caused.

According to an advantageous embodiment of the invention, there is Manhole from individual, each over the height of one Rohrblindels- extending sheet metal pipe sections and each section has a flap through which the shaft can be closed. This embodiment allows the one leading to the walk-in room To make the opening of the shaft very large, which on the one hand the The freedom of movement of the person entering the rooms is increased and, on the other hand, less material is required for the shaft. This embodiment can be further developed advantageously in that the sheet-metal tube sections are tube-covered on at least one Wall of the flue and that at least a wall of each sheet metal pipe section covered by a pipe

Rauchgaszugwand is formed. This makes it possible to that the pipe wall forming one wall of the access shaft is also accessible to a control and also to the heating through which smoke gas is exposed.

Two embodiments of the invention are in the following description explained with reference to the drawing. It show in a schematic representation;

Fig. 1 is a vertical section through an inventive Tower-type steam generator,

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Fig. 2 is a perspective view of part of a flue gas flue with modified access shaft and

FIG. 3 shows a detail of the shaft according to FIG. 2.

According to FIG. 1, a steam generator designated as a whole with 2 is suspended on a supporting frame 1, the combustion chamber 6 and the flue gas 30 connected thereto being surrounded by a gas-tight pipe wall 3. At the upper end of the flue gas flue, this passes into a ceiling 4, to which a chimney 5 attaches. 'At the upper end of the combustion chamber 6 heating surfaces 7 designed in the form of bulkheads are arranged. In the subsequent flue 30 then as a tubular heating surfaces trained 8. 9, 10 and 11. Above each follow ^A heating surfaces 7 to 11 is a walk-in room 7 · 8 · 9 ', 10' or 1! ' intended. In the flue gas pass, a passageway 12 is provided parallel to the flue gas pass walls which penetrates the tube bundles 8, 9, 10 and 11 as well as the ceiling 4. The shaft 12 consists of a continuous sheet metal tube of rectangular cross section. At its upper end, the shaft 12 can be closed by a cover 13 and the shaft is also accessible from this end. A fixed ladder 19 is attached within the shaft 12. At the level of the rooms 8 ', 9 ·, 10 · and 11 · there is an opening in the wall of the shaft 12 which leads to the relevant room and which can be closed by a flap 14, 15, 16 or 17. In the position of the flaps shown with solid lines, the openings are closed, while with dashed lines a position of the flaps is indicated in which they serve as the bottom. The flaps

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up to 17 can take a third, not shown position, namely hanging down in the shaft. At the lower end of the access shaft a flap 18 is also attached, which closes the shaft at the bottom and the positions shown in dashed lines Releases access to room 7 '. The flaps 14 to 18 are with funds not drawn to keep them in the with undrawn Lines shown position and to secure in the position shown with dashed lines.

Should the tube bundles 8 to 11 be checked and if necessary be repaired, the cover 13 is opened and the committed Person first brought the flap 17 into the position shown in dashed lines or into the downward-hanging position in order to commit to the space 11 '. After the inspection or repair has been carried out, the Flap 17 raised again and the person entering brings the Flap 16 in the dashed line or in the hanging down Location to walk into room 10 ', etc. When the boiler is in operation the flaps 14 to 17 and expediently also the flap 18 be in the position shown with solid lines, so not Parts of the flue gas flow past the tube bundles 8 to 11 through the manhole.

In the embodiment according to FIG. 2, the access shaft 12 consists of balcony-like sheet metal boxes arranged one above the other 23 and 24j whose height is in each case above the height of the neighboring one Tube bundle 28 and 29 extends. In the side walls of the Boxes are attached to the rungs of the ladder 19, which is when Box 23 up and down a piece beyond the box

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far continues. At box 24, the ladder goes up A little further away, so that all the ladder elements are continuous Head surrendered. The boxes are hung on the pipe wall 3, like this is shown in more detail in FIG. in the side walls of the Boxes are recessed hooks 27 which are welded onto the pipe wall 3 Grab eyelets 26. If it is necessary, the sheet metal boxes To secure it in the suspended state, it is sufficient to bring this about by means of a melting point between the hook and the eyelet. at The fourth wall of the shaft is formed by the pipe wall 3 in this passage shaft.

In each box 23 and 24 a flap 25 is arranged, which is shown in FIG the position shown closes the shaft and at the same time serves as a floor from which the person entering the room can be accessed the adjacent tube bundle 28 or 2 9 can commit. In this example it is also shown that the support tubes 31 and 32 for the tube bundles are arranged offset to one another in groups, so that it is possible for the person walking without difficulty is to get from the shaft into the space above the tube bundles. To from the space above the tube bundle 29 to the space above the tube bundle 28, the flap 25 is placed in the balcony-like box 24 upwards in the position shown in dashed lines, so that the person entering can descend into the balcony-like box 23. The access shaft is here also - which is not shown in detail - accessible from above. For this purpose, in the flue gas ceiling a lockable opening is provided. Instead of aligning the balcony-like boxes one above the other, it is also possible to mount them offset against each other.

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The installation of the access shaft according to the invention is not limited to steam generators in tower construction, but the shaft can also be used in steam generators with parallel next to the combustion chamber Attach the arranged abdominal gas cylinder. It is also possible to use the access shaft in horizontal flue gas flues *

In the two exemplary embodiments described, access to the manhole is from above through the flue gas ceiling. It is instead also possible that the access is from below, for example by the ash hopper or by a similar burner opening.

Another embodiment of the invention is to be found therein see that the manhole is centrally located in the flue will. This has the advantage that the walls of the access shaft are exposed to the same degree of thermal stress.

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Claims (1)

Claims 1. Steam generator with flue gas, the walls of which are covered with pipes and in which tube bundles are also housed, between which accessible rooms are provided, characterized in that that in the flue parallel to its pipe-covered boundary wall an access shaft penetrating the tube bundle is provided, each at the level of the accessible room one ^ Has an opening and is designed so that a flow through of the flue gas is avoided through the shaft. 2. Steam generator according to claim 1, characterized in that the Manhole in a manner known per se from a continuous Sheet metal pipe and that each opening leading to the walk-in room can be closed by a flap. 3. Steam generator according to claim 1, characterized in that the Manhole from individual, each over the height of the Tube bundle extending sheet metal tube sections and each Ab- ψ section has a flap through which the shaft can be closed, '. . 4. Steam generator according to claims 1 and 3, characterized in that that the sheet metal pipe sections on at least one pipe-covered wall of the flue gas flue are suspended and that at least one wall of each sheet metal pipe section is covered by a pipe-covered flue gas flue wall is formed. .5. Steam generator according to claim 1, characterized in that the »Access shaft through a lockable opening in the Flue gas ceiling is accessible. 6. Steam generator according to claims 1 to 3, characterized in that that with a vertical arrangement of the hatch every flap in their one position in the access shaft forms an intermediate floor. 7. Steam generator according to claim 1, characterized in that the Pipes of the pipe walls of the flue gas flue connected to one another in a gas-tight manner are. '™ 0C98 14/0032.