DE2351628A1 - FORCED FLOW BOILER - Google Patents

Description

The invention relates to a forced flow boiler with a helically wound pipeline.

The most difficult problem with the widely used once-through boilers with helically wound piping consists in the unstable flow of the to be heated Pluides. In order to solve this problem, have hitherto been in the inlet part Nozzles provided as a resistance to compensate for the flow velocities. However, with this method there is the difficulty that the mechanism of the nozzle part is complicated and that there is still an unstable flow pattern occurs when the partial load increases somewhat.

It is therefore the aim of the present invention to provide a forced flow boiler to be delivered in which the flow / the

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heating fluids is stable over a wide load range.

In the following an example, preferred embodiment of the invention is based on the accompanying drawing explained.

Fig. 1 shows a sectional view of an embodiment of a forced flow boiler according to the invention with a helically wound Pipeline.

Fig. 2 shows a sectional view along the line II-II in Fig. 1; and

Fig. 3 shows in a perspective view the connection of a pipeline in the passage of the fluid to be heated.

In Fig. 1 and 2, 1 denotes a cylindrical drum, which has an inlet opening 2 for the heating fluid at its upper end and an outlet opening 3 at the bottom. In the drum 1 are concentric, cylindrical partition walls 11,12,13 provided in the lower half of the drum, through the one Fall chamber 10, a chamber 9 for the helically wound pipelines and a central space 4 are delimited. Between the upper end of the partition wall 11 and the inner surface the drum 1 is provided with a shielding film 20. A number of water supply pipes 8 stand with a pipe collector 5 in Connection provided on the upper portion of the drum 1. These water supply pipes 8 are connected to downpipes 16, which are arranged circumferentially in the chamber 10, and each downpipe stands at its lower end with a connecting pipe 17 in connection. In the chamber 9 a number of helically wound tubes 14 are arranged, all with their lower end with the connecting pipe 17 via a reducer 15 in connection. Each helically wound Tube 14 is at the upper end with the respective vapor discharge line 7 and thereby connected to a collector 6 which is provided on the upper part of the drum 1. The water supply pipes 8, the downpipes 16 and the connecting pipes 17

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have a smaller diameter than the helical one winding pipes 14 and the steam lines 7, so that a pressure drop is generated. In the case of the one shown in the figure Embodiment is a cover 18 over the middle space 4 to prevent diversion of the heated fluid. This middle space 4 can be used for a wide variety of purposes.

During operation, heating fluid is introduced into the drum 1 from the inlet opening 2, and part of the fluid flows through it the fall chamber 10 and the rest through the channel 9 for the helical winding pipes and the heating fluid flows after the transfer of its own heat to the one to be heated Fluid through the outlet opening 3 to the outside. On the other hand will introduced the fluid to be heated through the lines 8,. flows into the downpipes 16, the connecting pipes 17, which are helical winding pipes 14 and the steam lines 7 and flows out of the collector 6 to the outside. In the downpipes 16 takes place preheating of the water takes place while boiling and overheating in the helically wound pipes 14 is reached. The downpipes 16, the connecting pipes 17 and the water supply pipes 8 have a smaller diameter than the helically wound pipes 14, and is the flow resistance on the water supply side, which has been increased by the nozzles in conventional systems increased by the smaller diameter of these tubes. The heating fluid is also passed through the downpipes 10 to also to achieve a heat transfer in these sections, whereby it becomes possible to use these sections as water preheating areas during full load and in these sections to reach a boil during a light load. This increases the tendency of the unstable flow as a result the extension of the superheater tubes in the case of the helically wound tubes 14 is reduced. '

According to the invention, the mechanism can be simplified more

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than is possible with conventional systems, and the Fluid flow can be stabilized over a wide range of loads. Since downpipes with smaller diameters continue to be used If the supplied water is used for heating, the size of the boiler body can be reduced.

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Claims (1)

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