DE1751114C3 - Formation of the wall connection edge of a continuous flow generator with welded pipe walls - Google Patents

Description

The invention relates to the formation of the upper and or lower edge of the wall tubing Once-through steam generator. whose wall tubing is helical with consistently the same slope out of pipes welded together, the upper and / or lower edge from exit the wall plane.

In such a steam generator known from UF PS 3 295 504 uie surround wall pipes a round, square, rectangular or polygonal space in cross-section and open out at the top and lower edge in a collector, which forms the wall closure. Collectors are at combustion chambers and more heated flue gas ducts are preferably laid unheated. To do this, the wall pipes lifted out of the wall plane and the wall ends are welded gas-tight.

Even with the steam generator according to GB-PS 457 425, the wall is closed by a collector educated. The end edge is designed in such a way that that each pipe of the wall is led along the end edge from one to the next pipe, where it is welded to the collector to make the connection with the collector before it is removed from the Wall level occurs. The intention of this design is to produce a partial steam flow from each pipe on the wall into the ring-shaped intermediate collector before the rest of the water flow out of the wall is derived.

Furthermore, a once-through steam generator formed from two line pipes is known (DT-AS

1235 951), the one where the wall pipes contact heating surfaces follow, has a horizontally guided tube that forms the support for the contact heating surfaces. For this purpose, an edge turn is one-sided lifted from the edge of the wall by a spacer, creating a gap. Farther here the line pipes are bent inwards from the wall level into the combustion chamber.

In order to ensure the gas-tightness of the pipe walls in the case of a wall connection edge, one of them must Wall part are welded gas-tight to the adjoining wall part. As a result of the spatial form of pipe elbows at this point requires the welding together of pipe wall parts the construction site by welding in a large number of Zwi'-kelfigencn pass webs disadvantageous before difficult and expensive welded joint. The gas-tight welded joint of two from all around rising Pipe winding strands formed pipe wall parts are particularly difficult when on the Connection point the pipe wall with a different number of pipes or a different pipe diameter per strand or continued with a different spatial position wii-J, what mostly applies. The heated area of the fitting pieces used is also too large and is not cooled enough.

It is the object of the invention to provide a favorable form of the pipe walls of the type mentioned at the beginning To find wall edges to make the pipe wall easier to gas-tight with other pipe wall parts to be able to weld.

This happens according to the invention d ^ diüch that several pipes evenly distributed around the circumference before leading out of the wall plane horizontally in the wall level to the next of these horizontally

ao guided pipes are continued and that the upper and / or lower edge of the wall with one extending over the entire circumference of the wall tubing A fin is provided, which also fills the gusset between the tubes.

as In this way it is achieved that the shape of the To be bridged gap when joining wall parts is easier and the wall parts are to be connected to one another in a gastight manner with a straight weld seam. The advantage of a straight gastight The weld seam is particularly clear when the wall parts to be joined are in different Location are. Furthermore, the connection edge designed according to the invention not only the area of the sheet metal gusset on the pipe bend

3ü smaller, but this is caused by the along the Edge guided tubes are also better cooled.

An embodiment of the invention is shown in the drawing and will be described in more detail below described. It shows

F i g. 1 is a vertical wall part, which according to the line 1-1 of F i g. 2 is cut,

F i g. 2 shows a plan view of the wall part according to FIG. 1.

In the F i g. 1 and 2 are the pipes with 1 to 6

• 45 of a pipe string designated with others Pipe strings together around the room 7, z. B. the radiation space of a once-through steam tractor, is wound increasing. The individual tubes of the strands are made gas-tight by webs 9 The pipe wall is welded and surround the room 7. At the level 10, the pipes come in the ascending winding Strands from the wall plane to make z. B. with enlarged pipe string cross-section, for switching the Forced-flow steam generator or to be continued in another way to create space. The winding strand corresponding to the pipes 1 to 6, these pass through the bends 1 'to 6' out of the pipe wall plane. To the gastight enclosure of the space 7 To ensure that another wall is welded gas-tight at level 10. Around that wall connection edge To give an advantageous shape for the welded connection, according to the invention, the Rohrl corresponding to the pipe string width 11 along the connection weld edge (height 10) before it emerges from the plane of the wall through the arch 1 '. A simple welding bar 12 can be used as a spacer and Connection piece can be provided for welding on a connecting wall, not shown.

1 sheet of drawings

Claims (1)

Claim: Formation of the upper and / or inner edge of the wall tubing of a once-through steamer, whose wall ring made of helical lines with consistently the same slope, consists of welded pipes, which are made at the top and / or bottom emerge from the wall plane, characterized in that that several tubes evenly distributed around the circumference (1) before the outfeed from the wall plane horizontally in the wall plane to the next one of these horizontally guided pipes (1) are continued and that the upper and / or lower edge of the wall with a fin (12) extending over the entire circumference of the wall tubing is provided. the also fill the gusset / wipe the tubes (1 to 6).