DE1165609B - Device for introducing steam into water, especially for degassing feed water in power plants - Google Patents

Description

Device for introducing steam into water, especially for Degassing of feed water in power plants The invention relates to a device for introducing steam into water, especially for degassing feed water in power plants, via a dip tube and a device connected to this for blowing the steam into the water as well as with a bypassing the water space Shunt line for the steam, which automatically depends on the respective Steam demand can be actuated.

With modern feed water and make-up water degassing systems in Power plants and other places have the task of keeping the steam below the Introduce the water level so that the water content is in the lower part of the apparatus is always in the boiling state.

However, the amount of steam to be introduced can vary within wide limits, depending on the amount and temperature of the water to be degassed in extreme cases. If, for example, normally a proportionate If a small amount of steam is blown through the water, this can in extreme cases increase ten or twenty times, thereby tearing up the water content and severely impair the function of the apparatus or make it illusory.

There are already devices for introducing steam into water, especially for the degassing of feed water in power plants, known that with a bypass path for the steam that bypasses the water space. For this for example, if a diaphragm was provided, but its use by the The difference between the largest and smallest amount to be injected is limited because it represents an immutable resistance. To remedy that one also has already used regulator, through which the shunt path is automatically dependent is opened or closed by the respective steam requirement.

According to the invention, automatic regulation of the shunt path can be achieved for the steam in a structurally and operationally particularly simple manner, that the steam immersion pipe at its lower end through openings with the water space, in the middle with the steam injection device and between this and the lower one End via a passage with the steam bypass line which increases with increasing steam demand connected is.

This results in an automatic, depending on the steam requirement dependent regulation of the steam supply.

Appropriately, there is a Dampfbenschlußleitunt alus in the Immersion tube protruding into the steam tube, which is open at the bottom. This can for the purpose of recording a certain - response range or to adapt to the size of the steam requirement be provided with several openings at different heights. It is advantageous for this from several concentric tubes, which from the outside inwards greater immersion depths to have. With these arrangements, the water plug is suddenly ejected prevented when the shunt line responds.

The drawing illustrates an embodiment according to the invention. It shows a feed water degasser in axial section, and this degasser exists essentially from a cylindrical container 1, in which the to be degassed Feed water is introduced via a spray arrangement 2. Via a line 3 and an annular pipe 4, steam is blown into the water below the water level 5.

The ring pipe 4 is connected to a steam immersion pipe 6 in the middle, which in turn is connected to line 3. This dip tube is at the bottom The end is provided with fine openings 7 so that it communicates with the water space. A multi-part immersion tube 8 protrudes into the immersion tube 6, which acts as a bypass path serves for the steam. This immersion tube consists of several concentric tubes, which have greater diving depths from the outside to the inside. Its lower ends lie between the ring pipe 4 and the openings 7 of the steam immersion pipe 6. The immersion pipe 8 opens into the vapor space of the degasser at the top. The concentric bypass tubes are cut diagonally at the bottom, so that they act as a response edge for the flow around them of the steam results in a spiral, whereby the steam increase in the bypass is continuous runs.

The steam entering through line 3 flows through the annular space 10 down between the immersion tube 8 and the steam immersion tube 6 and passes through the annular pipe 4 in the water spaces outside and inside a separating pipe 9 according to above as.

The water level in the annular space 10 is during normal operation below the ring pipe 4.

If the demand for steam increases, the pressure difference at the outlet increases of the steam from the annular tube 4 increase and thereby the water level in the annular space 10 pressed down, the water through the openings 7 in the water space escapes.

When the water level rises above the lower edge as a result of increased steam requirements of the outermost steam bypass pipe, a partial amount of steam begins the annulus between this outermost bypass tube and the following bypass tube exit upwards directly into the vapor space of the degasser. When addressing this first bypass path, the steam has only the water plug located in this annulus to eject. If the demand for steam becomes even greater, the pressure difference at the outlet increases of the steam from the annular tube 4 continue to increase and thereby the water level in the Annular space 10 pressed further down, the water escaping through the openings 7 and sequentially the downwardly staggered openings of the various bypass tubes speak to.

If the amount of steam decreases, the process proceeds in the opposite direction, until the concentrically arranged tubes are all immersed again with their lower edges and steam finally only emerges through the annular tube 4.

Various modifications and others are within the scope of the invention Executions possible.

For example, the steam bypass path could also be through an immersion tube are formed with openings staggered in height, although the Subdivision into several tubes of different immersion depth because of the lower and ge staggered ejection work for the water plug is cheaper.

Claims (5)

Claims: 1. Device for introducing steam into water, especially for the degassing of feed water in power plants, via an immersion pipe and a device connected to this for blowing the steam into the water as well as with a bypass line for the steam that bypasses the water space can be actuated automatically depending on the respective steam requirement, thereby marked e i c h n e t that the steam immersion pipe (6) at its lower end through openings (7) with the water space, in the middle with the steam injection device (4) and between this and the lower end over a with increasing steam demand enlarging passage is connected to the steam bypass line. 2. Apparatus according to claim 1, characterized in that the steam bypass line consists of a dip tube (8) which protrudes into the steam tube (6) and is open at the bottom. 3. Apparatus according to claim 2, characterized in that the shunt immersion tube (8) has several openings at different heights. 4. Apparatus according to claim 3, characterized in that the shunt immersion tube (8) consists of several concentric tubes, the larger from the outside to the inside Have diving depths. 5. Apparatus according to claim 3 and 4, characterized in that the openings of the shunt immersion tube (8) are arranged in a spiral. Publications considered: German Patent only. 734028, 1 001 686.