JPS58106308A - Deaerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deaerator for use in feed water deaerators such as boilers and steam generators.

The structure of a deaerator according to the prior art will be explained in FIG.

The deaerator generally consists of a deaeration chamber 1 and a water storage tank 2, and is installed above the deaeration chamber 1 and the water storage tank 2. The degassing chamber 1 is used to degas the water supplied to boilers, etc. (corrosive gases O, CO, etc.)
, , etc.) It has a tray storage chamber 3 inside, and a tray 4, which is a gas-liquid contacting device, is installed inside the main chamber. At the top of the tray storage chamber 3, a spray part 5 for atomizing the supplied water is installed.As soon as the supplied water enters the deaeration chamber IK, it is sprayed at the pressure in the deaeration chamber by the spray part 5, where it is sprayed. I can explain later. The first in contact with the heated steam
Boiling diffusion degassing is performed in the stage, and dissolved gas pipes in the feed water are degassed.

The water sprayed by the spray part 5 is collected in a water receiving part 6, and then is sprayed into a train 4.

Tray 4F'i has the role of making the supplied water as thin as possible, allowing it to naturally flow down from the top to the bottom while stirring the tank as much as possible, and bringing it into sufficient contact with the heated steam rising from the bottom. -1 heating steam 7 is introduced into the deaerator through the steam inlet 8, and flows into the tray portion from the lower part around the tray storage chamber 3. The heated steam 7 comes into contact with the feed water, and according to the gas-liquid flat noodle principle, the heated steam side pressure dissolved gas, which contains almost no dissolved gas, is transferred from the water supply side where the dissolved gas is high to the second
This completes the stage degassing. After the heated steam comes into contact with the feed water, it is sequentially condensed to become condensate, which flows down to the lower part of the degassing chamber together with the feed water. The dissolved gas 9 degassed from the feed water is accompanied by the rise of steam and is discharged outside the vessel from the air vent 10 in the upper part of the deaeration chamber.

However, in the above-mentioned conventional technology, the following difference in performance existed between the first stage degassing (due to a portion of the spray) and the second stage degassing (due to a portion of the tray).

1) 1141 stage deaeration Deaeration rate: approximately 90% Heat exchange rate = approximately 95% Deaeration mechanism: Feed water particles from the feed water injection have a huge outer surface area, and the injection speed is as high as 16 m/I. While flowing through the steam, there is a rapid heat exchange with the heated steam (usually a temperature rise of about 30C to 100C), and the self-condensation becomes a boiling state, and the dissolved gas in the n1 feed water is stirred by the injection and has the effect of boiling. Approximately 90% of this is removed.

2) 2nd stage degassing Degassing rate: Approximately 10% Heat exchange rate: Approximately 5% Two degassing mechanisms In degassing, the supplied water flows down naturally on the tray in the form of a film, and the above-mentioned intense Since there is no stirring action, the only option is to make the water supply as thin as possible, take care to ensure sufficient stirring, and take time in accordance with the principle of vapor-liquid equilibrium.

Due to the above-mentioned performance characteristics, in the conventional deaerator, a portion of the tray requires time for gas-liquid contact, so the tray storage chamber is large and has a structure that occupies most of the deaeration chamber. However, the degassing performance in a part of the training was 10% overall.
At present, only about % of the time is available.

It is an object of the present invention to provide a high performance deaerator without using an inefficient tray mechanism.

The feature of the present invention is that by configuring the deaerator in the first stage deaeration (deaeration by spraying), it is possible to achieve a compact and high-performance deaeration a that eliminates the need for an impossible tray storage section. It is something to do.

Next, one embodiment of the present invention will be described with reference to FIG.

A deaeration part enclosure 21 is placed in the deaeration chamber 1, and a spray part 22 is installed as shown in the figure. The supplied water that has been sprayed out by the spray part 22 is received by the water sprinkling tray 23, overflows, and flows down onto the lower water sprinkling tray. The spray part 22 is 2 as shown in the figure.
Install tiers or more on each spray part of the company's water supply pipe 2
The supplied water introduced from 9 passes through the control valve 25 or 26 and is introduced into the degassing chamber. Deaeration performance is achieved by injecting water supply from a portion of the sprayer and deaeration by the water spray tray, but when the amount of water supply is small, such as during low load operation, by closing the lower spray control valve 26, It is possible to ensure the minimum injection flow rate.

In addition, if it is desired to further improve the deaeration performance, the deaerated feed water collected in the intermediate watering tray 33 is led to the ejector 28 using the feed water flow by the suction mechanism 27, and the spray part 22 is again guided. It is also possible to perform injection degassing. The heated steam is introduced into the deaeration chamber through a steam introduction pipe 31, and a baffle 32 is preferably installed around the introduction pipe.

The above-described mechanism of the present invention provides the following effects.

Since a tray with a large structure is not used, a compact and high-performance deaerator can be realized. Note that, according to the embodiments of the present invention, the following effects can be further obtained.

1) For deaerators that use trays, it is no longer necessary to inspect the trays in and out during periodic inspections.

2) In the tray structure, since the tray members are assembled quite closely, there is a risk of flooding phenomenon in which the water supply stops flowing during overload operation or other conditions, but this mechanism does not have such problems.

As described above, the mechanism of the present invention can provide a deaerator that is significantly improved over the prior art.

FIG. 3 shows nine other implementations of the present invention.

Fig. 3 is mechanically similar to Fig. 2, but in the embodiment shown in Fig. 2, the degassed water on the intermediate watering tray is removed by the suction mechanism without employing a mechanism to return the water supply line again. As shown in the figure, the intermediate water spray tray 33 and the spray part 22 are combined, and the principle of atomization is used to feed the water collected by the intermediate tray 33 with the spray force of the spray part 22, thereby obtaining a re-injection 42. be.

This is an example in which high-purity degassed water is obtained by this mechanism after being treated in the 12th stage of feed water #'.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a deaerator according to the prior art, FIG. 2 is a sectional view showing a deaerator according to an embodiment of the present invention, and FIG. 3 is a partial sectional view showing another embodiment of the present invention. It is. 1... Deaeration chamber, 22... Spray part, 23.24.
...Water tray, 27...Suck-up mechanism, 31...Steam introduction pipe, @ l m 41 Fig. 3

Claims (1)

[Claims] 1. A spray device that sprays water supply into the deaeration chamber of a deaerator, and a watering tray that receives the water sprayed from the spray device and allows it to flow downward are arranged in multiple stages. Features a deaerator. 2.411'FllllI Required Scope The deaerator according to item 1, characterized in that a piping system is installed for sucking up the water supplied from the watering tray again and supplying it to the spray device. 3. I% In the deaerator according to claim 1, the steam introduction pipe for introducing heated steam is horizontally arranged below the cough spray device and the watering tray in the deaeration chamber. Deaerator.