DE4344409C2 - Steam or hot water generators with flag heating surfaces arranged in the flue gas stream - Google Patents

Description

The invention relates to a steam or hot water generator with in the flue gas stream arranged flag heating surfaces, which are formed from U- or W-shaped tubes and are connected on the water side via flag holder tubes and a flag holder tube is connected to the Have a relief pipe connecting the collecting pipe.

Steam and hot water boilers have radiant and touch heating surfaces. For the Different types of training are known, of which the design of the contact surfaces the shape of the flag heating surface according to DE 11 19 873 C is remarkable Has received wide range of applications. It is essential for the function of the flag heating surface that the lead cross-section of the flag holder tube is suitable, the steam-water mixture dissipate. For larger boilers, separate return pipes are provided, such as those from the DE 15 01 678 C3 are known. The return pipes have the disadvantage that they have the entire length of the flag holder tube / side wall tube from the connection point on Flagpipe down in the vicinity of a manifold, difficulties with to prepare the bracing of the long side wall tubes by horizontal bandages. It is further known to pass these downward separate return pipes each associated discharge pipes to replace, which also like the return pipes on the Flue gas flow facing away from the flag holder tube and attached to the top Collector pipe are connected. The discharge cross-section becomes through this relief pipe of the flag holder tube enlarged by the flow cross section of the relief tube. Flow model experiments showed that the relief pipe was not flowed through. The disadvantage is a lower mass flow in the flagpoles, which is only is dimensioned such that it is led through the flag holder tube into a main collector can.

The invention has for its object a steam or hot water generator Generic type to create an improved distribution of the mass flow to the Has flag holder ears.

According to the invention the object is achieved in that directly in the flag holder tube Above the junction of the relief pipe, a locking washer to divide the Flag pipes coming mass flow is attached.  

The solution according to the invention has the advantage that when subjected to high thermal loads Flag heating surfaces, the pipes of which have a high mass flow for cooling the pipe material require the mass flow is made possible by the fact that the flow resistance of the Lead cross-section of the flag holder tube by dividing the mass flow the flag holder tube and a relief tube is changed. The assignment of the mass flow to be discharged into the relief pipe is carried out via an additional Throttle disc in the flag holder tube arranged locking disc, their arrangement in Relation to the connections of the flagpoles to the flagpole tube on the basis of flow resistance calculations is provided.

The invention will be explained in more detail using an exemplary embodiment.

The accompanying drawing shows that a flag heating surface 2 is connected to a flag holder tube 1 on the water side. The flag holder tube 1 is connected to a collector tube 3 . For water-round side discharge of the flow cross-section of the tabs holding the tube 1 at the connection point 4 to the header pipe 3 is at a a relief pipe 5 is attached by calculation to be determined location on the unheated side of the flags holding tube 1 to the header pipe 3, a water-side connection between the flags holding tube 1 and the header pipe 3 manufactures. In order to ensure the mass flow through the relief pipe 5 is in the flag holding tube 1, arranged directly above the connection of the discharge pipe 5 at the lugs holding tube 1, a locking disk. 6 The locking disk 6 is brought into an operative connection with the throttle disk 7 arranged under the connection of the relief tube 5 . With the arrangement of the blocking disk 6 , the flow-restricting function of the throttle disk 7 results in an approximately equally divided flow guidance into the tubes of the flag heating surface 2 .

List of the reference symbols used

1

Flags holding tube

2

Fahnenheizfläche

3

collector pipe

4

junction

5

discharge pipe

6

locking disc

7

throttle disc

Claims (1)

1. Steam or hot water generator with flag heating surfaces arranged in the flue gas stream, which are formed from U-shaped or W-shaped tubes and are connected on the water side via flag holding tubes and have a relief tube connecting the flag holding tube to the collecting tube, characterized in that in the flag holding tube ( 1 ), directly Above the connection point of the relief tube ( 5 ), a locking disc ( 6 ) for dividing the mass flow coming from the flagpoles is arranged.