JPH0623206A - Exhauster - Google Patents

Abstract

PURPOSE:To provide an exhauster for decreasing the quantity of vapor separated by a gas-liquid separator and discharged in the air. CONSTITUTION:The end part of a vapor introducing pipe 5 for introducing vapor separated by a gas-liquid separator into a vessel 6 is inserted into the vessel by at least a half of the height of the vessel. A nozzle 7 for spraying cooling water to cool the vapor introduced into the vessel 6 from the vapor introducing pipe 5 is installed in the upper part of the vessel. A drain pipe 10 for discharging the cooling water sprayed from the nozzle 7 and condensate from the bottom of the vessel 6 is installed. An exhaust port 11 is installed in the lower side of the vessel 6 and above the installed position of the exhaust port 10. An exhaust pipe 12 is connected to the exhaust port and opened to the air. And a partition plate 13 is fitted in the vessel so as to cover a part of the exhaust port 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system applied to a thermal power / nuclear power plant and the like.
The present invention relates to an exhaust device that prevents the release of water vapor when the steam separated by a gas-liquid separator is discharged into the atmosphere from a steam discharge pipe.

[0002]

2. Description of the Related Art In a thermal power / nuclear power plant, when starting, a high temperature / high pressure drain containing a lot of salts and the like and having poor water quality is discharged to the outside of the system. However, this high temperature
If the high-pressure drain is discharged into the atmosphere as it is, a large amount of flash vapor is generated in the drainage pit, which may fill the surrounding area and cause a rain phenomenon, which may worsen the environment. Therefore, in the past, high-temperature / high-pressure drain was once collected in a gas-liquid separator, the flash vapor and drain were sufficiently separated, and then the flash vapor was diffused into the atmosphere from the vapor discharge pipe, and the drain was discharged to the drainage pit. I am trying to do it.

Further, since water droplets may be rolled up from the gas-liquid separator and discharged into the atmosphere, in order to prevent this, conventionally, a liquid such as a perforated plate or a wire mesh is provided in the gas-liquid separator. A drop catcher is provided to reduce the amount of drops that flow into the vent pipe, or a water drop filter is provided along the way from the gas-liquid separator to the vapor discharge pipe, and a high temperature gas is jetted toward this water drop filter. Then, measures such as evaporating water drops are taken.

[0004]

By the way, with the recent increase in the capacity of power plants, the drain discharged outside the system becomes higher in temperature, pressure, and quantity, and is discharged from the steam discharge pipe. The amount of flash steam is also large. Therefore, it is not enough to provide the conventional means for collecting the droplets and the means for evaporating the water droplets, and it is necessary to reduce the discharge amount of the vapor as much as possible. In addition, the size of the gas-liquid separation device may not be sufficiently secured for the gas-liquid separation due to the restriction of the installation space.In this case, the vapor flow velocity in the gas-liquid separation tank becomes large, There was a problem that before the water drops were sufficiently dropped and separated, they were rolled up by the steam flow into the steam discharge pipe, and the water drops were discharged from the exhaust port to cause a rain phenomenon.

The present invention has been made in order to solve the problems of the prior art as described above, and provides an exhaust device for reducing the amount of vapor separated into a gas and discharged into the atmosphere. The purpose is to provide.

[0006]

In order to solve the above problems, an exhaust device according to the present invention is connected to a container into which vapor separated by a gas-liquid separator is introduced and the gas-liquid separator. , A steam introducing pipe whose tip is inserted into the container to at least half the height of the container, and which is provided above the container and for cooling the steam introduced into the container from the steam introducing pipe. A nozzle for spray-injecting cooling water, a drain pipe for discharging cooling water and condensed water jetted from this nozzle from the bottom of the container, and a lower side surface of the container above the mounting position of the drain pipe are provided. An exhaust pipe having one end connected to the exhaust port and the other end opening to the atmosphere, and a partition plate mounted in the container so as to cover a part of the exhaust port are provided.

[0007]

[Operation] According to the above means, the steam introduced from the gas-liquid separation device into the container through the steam introducing pipe is cooled by the sprayed cooling water and condensed, and is discharged from the bottom of the container together with the cooling water. It In addition, the vapor remaining without being condensed is discharged into the atmosphere through the exhaust pipe provided at the lower part of the side surface of the container, but the partition installed inside the container covers part of the exhaust port. Since the plate blocks the cooling water sprayed, the discharge amount of steam including water droplets can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a side view showing an embodiment of an exhaust device according to the present invention in a partial cross section, and FIG. 2 is a configuration diagram showing a state in which the exhaust device of FIG. 1 is combined with a gas-liquid separation device.

First, as shown in FIG. 2, a high temperature and high pressure drain that has worked in a turbine or the like is recovered through a drain inflow pipe 2 in a gas-liquid separator 1 and is separated into flash steam and drain here. . Then, the drain is discharged through the drain discharge pipe 3 to the drainage pit 4, while the flash steam is introduced through the steam introduction pipe 5 into the container 6 that constitutes the exhaust device according to the present invention.

Details of this container 6 are shown in FIG.
That is, the container 6 has a bowl shape with a bottom curved downward, and the steam introduction pipe 5 is provided so as to be inserted into the container 6 from the center of the bottom. The tip of the vapor introducing pipe 5 reaches about half the height of the container 6, and it is preferable to locate it at about ⅔ of the height of the container 6 as indicated by the symbol H. Also, the inner diameter D of the container 6
Is preferably about 3 times the inner diameter d of the steam introducing pipe 5 (about D = 3d) or more. A nozzle 7 for spray-injecting cooling water is provided in the upper part of the container 6, and the nozzle 7 is connected to a cooling water pipe 8.

Further, a drain port 9 is formed at the lowest position of the bottom of the container 6, and a drain pipe 10 is attached thereto. The tip of the drain pipe 10 reaches the drain pit 4, as shown in FIG. Further, an exhaust port 11 is provided in a lower portion of a side surface of the container 6 so as to be located above a mounting position of the drain pipe 10, and the exhaust pipe 12 is provided in the exhaust port 11.
Are connected. The exhaust pipe 12 extends above the container 6,
The tip is located at a high place and is open to the atmosphere. A partition plate 13 is attached inside the container 6 so as to cover a part of the exhaust port 11.

When a plurality of drain pipes 10 and exhaust pipes 12 are led out from the container 6 as shown in this embodiment, the former pipe is used as a collecting pipe.

Next, the operation will be described. The tip of the steam introducing pipe 5 is located at a position higher than half the height of the container 6, the opening surface of the steam introducing pipe 5 is covered with the top surface of the container 6, and the exhaust port 11 is located below the container 6. The flash vapor from the gas-liquid separation device 1 flowing into the container 6 through the vapor introducing pipe 5 flows from the upper part to the lower part of the container 6 because it is provided in the. Then, when the cooling water is spray-injected from the nozzle 7 in the upper part of the container 6, the droplet flow of the cooling water drops from the upper part to the lower part of the container 6 by gravity. That is, the droplet stream of the cooling water flows downward along the flowing flash steam. Therefore, the steam is cooled and reaches the bottom of the container 6 while condensing, and the cooling water and the condensed water are stored in the bottom of the container 6.

The flow velocity of the steam flowing inside the container 6 becomes smaller as the inner diameter D of the container 6 is made larger, that is, as the cross-sectional area of passage of the steam is made larger, and as the flow velocity of the steam is smaller, the steam is condensed. The amount increases. Therefore, the container 6
It is desirable to make the inner diameter D of the as large as possible. In the present embodiment, as described above, the inner diameter D of the container 6 is about 3 times the inner diameter d of the steam introducing pipe 5 (about D = 3d), and the flow velocity of the steam inside the container is within the steam introducing pipe 5. Of the flow velocity at 1
/ 8 times. Also, the flow rate of steam in the container,
The introduction amount of cooling water, the droplet diameter by spray injection, etc. should be determined by the theoretical calculation of condensation heat transfer depending on how much of the total exhaust vapor amount is condensed. Let's not touch it.

Now, since the bottom of the container 6 is formed in a bowl shape curved so as to be convex downward, and the drain port 9 is formed at the lowest part thereof, the stored cooling water and condensed water are collected. Is quickly discharged from the drainage port 9 through the drainage pipe 10. Therefore, the stored cooling water and condensed water are suppressed from being rolled up by the vapor flow in the container 6. On the other hand, the vapor left uncondensed while flowing from the upper part to the lower part of the container 6 is led out to the exhaust pipe 12 from the exhaust port 11 provided at the lower part of the side surface of the container 6 to the atmosphere from the opening at the tip thereof. Is discharged to. At this time, since the spray injection is blocked by the partition plate 13 attached so as to cover a part of the exhaust port 11, it is possible to prevent the vapor stream discharged from the exhaust port 11 from being entrained with a droplet flow. .

[0016]

As described in detail above, by installing the exhaust system according to the present invention in a large-capacity power plant or the like, it is possible to reduce the amount of steam discharged into the atmosphere and thus suppress the rainfall phenomenon. It is possible to obtain a very remarkable effect.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an exhaust device according to the present invention with a part thereof shown in section.

FIG. 2 is a configuration diagram showing a state in which the exhaust device of FIG. 1 is combined with a gas-liquid separation device.

[Explanation of symbols]

 1 Gas-Liquid Separation Device 5 Vapor Inlet Pipe 6 Container 7 Nozzle 10 Drain Pipe 11 Exhaust Port 12 Exhaust Pipe 13 Partition Plate

Claims (1)

[Claims] 1. A container into which vapor separated by a gas-liquid separator is introduced, and a vapor which is connected to the vapor-liquid separator and whose tip is inserted into the container to at least half the height of the container. Introducing pipe, a nozzle provided above the container, which spray-injects cooling water for cooling the steam introduced into the container from the steam introducing pipe, and the cooling water or condensed water injected from this nozzle. A drain pipe for discharging from the bottom of the container, an exhaust pipe having one end connected to an exhaust port provided at a lower portion of a side surface of the container above a mounting position of the drain pipe, and the other end opening to the atmosphere, An exhaust device, comprising: a partition plate mounted in the container so as to cover a part of the exhaust port.