DE94412C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

It is well known that all heating tube boilers produce very wet steam. "Of the numerous devices Only a few have proven themselves so far for drying the steam, and one well-known Overheating has always failed because of the extraordinary difficulties confronts the constructor with this task.

The practical solution to this problem is the subject of the present invention.

The invention rests on the basic idea, part of that developed on the herd To use hot gases immediately to the extent for steam superheating, as this the respective operating mode requires. For this purpose, between the actual heating pipes, and generally as high as possible, with a further heating pipe installed in such a way that it allows it to be inserted inside with its axis parallel bundle of narrow tubes or pipe coils to take up their total surface is sufficient to achieve the desired maximum overheating of the entire amount of steam with unrestricted passage of the flue gases to cause which the boiler is able to generate. With large bowl diameters it may be necessary to have several heating tubes to accommodate superheater tube bundles or to provide snakes. From the total flow through the heating pipes outgoing fire gases are then a corresponding number of streams for overheating branched off.

This avoids overheating chambers that are too wide and the friction of the heating gases on the superheater bodies is increased, and the remaining for the steam generation The main flow of heating gases is the least distracted and weakened.

The regulation of the overheating is expedient in this new boiler system Regulation of the amount of heating gases causes which directly to various superheater tube bundles can act. * ■

In Fig. Ι and 2, an embodiment of the new heating tube superheater boiler for locomotives is shown for the sake of simplicity with only one superheater chamber. A further tube α is installed between the heating tubes , which double tubes b bent in a U-shape extend lengthways in such a way that the radial bundle arrangement shown in FIG. 2 is created. The U-shaped part of the superheater tubes is supported by a protective ring c attached near the confluence of the flue gases (Fig. 1).

A double ring chamber d is attached to the front pipe wall on a strong base plate e. The outer ring of this chamber is, for example, in direct connection with the steam extraction point of the boiler. Through the intermediary of the base plate e , all the legs of the U-shaped overheating tubes b facing the wall of the tube a open into the outer annular chamber, whereas the inwardly bent tube legs are connected to the inner tube chamber d ₂ by the base plate e . A free space remains inside the tube bundle for the entry and distribution of the heating gases; before

everything is such for convenient cleaning by means of steam jets or the like Importance.

A circular plate f moves on the legs of the U-shaped superheater tubes, which can be moved by the rod g and the lever h (from the driver's cab).

The superheater chamber can thus be completely closed or for the passage of Heating gases are more or less opened.

In Fig. 3 it is indicated in which way a large superheater surface can be created in the narrow superheater chamber, where one has to work towards particularly high overheating, without the possibility of easy and safe cleaning of the superheater bodies being significantly impaired. According to the embodiment, three concentric bundles of parallel tubes are connected at the front ends with the already above-mentioned double ring chamber d by the base plate e , that the two inner circular bundles receive the wet steam from the inner ring chamber, the same after a foot ring i, in which the The rear pipe ends all open, lead in countercurrent to the heating gases and lead back in the outer circular bundle to the outer annular chamber. Of course, you can also use several bundles of circles and, instead of an annular chamber i , attach individual radially positioned connecting shoes into which two or more connected tubes open.

For small amounts of highly superheated steam, the tube bundle is expediently through a Snake tube to be replaced.

Fig. 5 shows an embodiment. The wet steam enters queue b at k and exits at /. The annular chamber is omitted here, and the regulation is done by a plate m, which is arranged on the inlet and outlet pipes so that they can be moved.

4 and 6 show sections across the superheater chamber.

The mode of operation of the whole arrangement is so simple here as there that it is a special one No explanation required. With the simplest structural means here is this for the task at hand most difficult boiler system to a safe-looking and easy adjustable superheater boiler without any annoying appendages.

Claims (2)

Patent Claims: 1. A heating tube boiler for controllable steam overheating, characterized in that bundles of tubes or coils (b) are arranged in one or more wide heating tubes (a) , in which the boiler steam is dried by the heating gases in countercurrent and returned in cocurrent with these and according to a controllable one Throttling of the through opening remaining in the heating tubes (a) is less or more overheated. 2. An embodiment of the under i. claimed heating tube boiler, in which the bundle of superheater tubes consists of two or more concentric groups, which bezw on the inlet side of the steam with a double chamber (d) and on the fire side with each other through an annular chamber (i) or through individual radial channels. are connected by pipe bends in such a way that the boiler steam entering the inner or outer division of the double chamber (d) flows through one or more groups of the tube bundle towards the flue gases and then flows back through the other groups to overheat into the outer or. to enter the inner division of the double chamber. · For this purpose ι sheet of drawings.