JPH0563681B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a moisture separator used in a power generation plant, and more particularly to a discharge structure for drain separated from steam in a body.

[Background of the invention]

Figure 1 shows a general power plant system diagram,
After the steam generated by the steam generator 1 performs work in the high-pressure turbine 2, the moisture in the steam is separated by the moisture separator 3, and the steam is guided to the low-pressure turbine 4.
The steam that has done work in the low-pressure turbine 4 is condensed in a condenser 5, and sent to the steam generator 1 via a feed water heater 7 by a feed water pump 6. On the other hand, the moisture separated by the moisture separator 3 is led to a drain tank 8 as drain, and then sent to the feed water heater 7 via a regulating valve 9.

The conventional moisture separator used in this power plant has the configuration shown in FIGS. 2 and 3.

That is, the body 10 of the moisture separator is equipped with a moisture separating means 11 composed of a corrugated plate and a corrugated plate insertion box, and a steam inlet 1 is provided at the bottom of the body 10.
2 and a drain outlet 13, and a steam outlet 14 at the upper part, an inlet flow divider plate 15 at the steam inlet 12, and a tray 16 communicating with the drain outlet 13 at the lower part of the moisture separating means 11. Each has its own configuration. The steam exhausted from the high-pressure turbine and flowing into the body 10 from the steam inlet 12 is transferred to the body 10 by the inlet flow divider plate 15.
After being diffused in the lower part of the body, the moisture is separated while passing through the moisture separating means 11 and is released from the steam outlet 14 into the body 10.
It goes outside and is guided to a low-pressure turbine. On the other hand, the moisture separated by the moisture separating means 11 becomes drain and drips onto the tray 16, and then is guided through the tray 16 from the drain outlet 13 to the drain tank.

However, in the above-mentioned moisture separator, before the steam flowing into the body 10 from the steam inlet 12 enters the moisture separating means 11, it collides with the inlet flow divider plate 15 of the steam inlet 12 section, causing the steam to flow into the body 10. Some of the moisture becomes drain. This drain accumulates at the bottom of the fuselage 10 and tries to flow out from the edge of the steam inlet 12 toward the high-pressure turbine, but is rolled up by the high-speed incoming steam and returned to the fuselage 10, reducing the moisture separation efficiency. Deteriorate. In particular, in the power plant shown in Figure 1, not only during normal operation but also when the plant is started up, a large amount of condensate condensate is generated due to the temperature rise in the body of the moisture separator. As the moisture content in the steam increases, the amount of condensate that is rolled up and returned into the body increases, further reducing the moisture separation efficiency. Furthermore, since the drain is blown up as droplets at high speed and returned into the body, there is a risk of corrosion of internal structures such as the moisture separator, downstream piping of the moisture separator, and the low-pressure turbine.

[Purpose of the invention]

It is an object of the present invention to provide a moisture separator that can solve the problems of the prior art described above, improve moisture separation efficiency, and prevent erosion of internal structures such as moisture separation means, downstream piping, and low-pressure turbines. It is about providing the equipment.

[Summary of the invention]

To achieve this objective, the present invention provides a weir on the body wall near the steam inlet to prevent the backflow of condensate separated from the steam at the steam inlet, and
A drain reservoir is formed at the bottom of the fuselage by the weir, a drain discharge pipe is provided on the bottom wall of the fuselage for discharging the drain from the drain reservoir to the drain tank, and a drain discharge amount is adjusted in the middle of the drain discharge pipe. The present invention is characterized in that it is provided with an orifice that bypasses the orifice, and a bypass pipe that bypasses the orifice and has an on-off valve interposed therebetween.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. FIG. 4 shows a cross-sectional view of a moisture separator according to the invention. This moisture separator has its body 20
The interior of the body 2 is equipped with a moisture separation means 21 constituted by a corrugated plate and a corrugated plate insertion box.
Steam inlet 22 and drain outlet 23 at the bottom of 0
and a steam outlet 24 at the top. Further, an inlet flow dividing plate 25 is provided at the steam inlet 22 portion, and a tray 26 communicating with the drain outlet 23 is provided below the moisture separating means 21. A weir 27 is provided on the bottom wall of the body 20 near the steam inlet 22 to prevent backflow of condensate separated from the steam at the steam inlet, and a drain reservoir 28 is formed at the bottom of the body 20 by the weir 27. ing. Further, the drain reservoir 2 is located on the bottom wall of the body 20.
A drain discharge pipe 30 is provided for discharging the drain of No. 8 to the drain tank 29. Drain discharge pipe 3
An orifice 31 for adjusting the drain discharge amount and a bypass pipe 32 bypassing the orifice 31 and having an on-off valve 33 interposed therebetween are provided in the middle of the drain.

Next, the operation of the present invention will be explained. The steam flowing into the body 20 from the steam inlet 22 is changed in direction and flow velocity by the inlet flow divider plate 25, and a part of the moisture is separated.
Moisture is condensed by contact with 0, and drainage is generated, and the drainage is collected in a drainage reservoir 28 formed by a weir 27. The steam from which a portion of the moisture has been separated passes through the moisture separation means 21, where the moisture is separated and is led out of the body 20 through the steam outlet 24. The drain separated by the moisture separating means 21 drips onto a lower tray 26 and is guided through the tray 26 from the drain outlet 23 to the drain tank 29. The drain collected in the drain reservoir 28 is transferred to the weir 2.
7 and prevents backflow, that is, the steam flowing in from the steam inlet 22 prevents the condensate from being rolled up by the weir 27 and returns to the body 20. Therefore, the moisture separating means 21
The amount of moisture flowing into the area decreases. Therefore, moisture separation efficiency is improved. During normal operation, the drain accumulated in the drain reservoir 28 is guided to the drain tank 29 through the drain discharge pipe 30 while the discharge amount is adjusted by an orifice. , the on-off valve 33 of the bypass pipe 32 in the drain discharge pipe 30 is opened, and the drain is guided to the drain tank through the bypass pipe 32, thus ensuring that the drain accumulated in the drain reservoir is removed from the drain tank according to the operating status of the power plant. Therefore, it is possible to prevent corrosion of internal structures including moisture separation means, downstream piping, and low-pressure turbine.

FIG. 5 shows another embodiment of the present invention,
The difference from FIG. 4 is that a drain tank 29 is connected to a drain outlet 23. In this embodiment, in addition to achieving the functions and effects described above, there is an advantage that the piping connecting the drain outlet 23 and the drain tank 29 can be omitted.

FIG. 6 also shows another embodiment of the present invention.
A first stage reheater 34 and a second stage reheater 35 are provided in the body 20 on the downstream side of the moisture separation means 21 to provide a reheating function. To explain in detail, the first stage reheater 34 heats the steam that has passed through the moisture separation means 21 using the extracted steam from the high-pressure turbine 2 as a heat source. Further, the second stage reheater 35 is designed to heat the steam that has passed through the first stage reheater 34 using extracted steam from the steam generator as a heat source. In addition, 36 in the figure is the high pressure turbine 2.
a bleed pipe that leads the bleed steam from the bleed steam to the first stage reheater;
7 transfers extracted steam from the steam generator to the second stage reheater 3
5, a drain tank 38 stores the drain generated in the first stage reheater 34 through the drain discharge pipe 39, and 40 a drain that stores the drain generated in the second stage reheater 35 through the drain discharge pipe 41. Showing the tank.

According to this embodiment, it is possible to use it not only as a mere moisture separator but also as a moisture separation reheater.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to improve the moisture separation efficiency, and the moisture separation means This can prevent erosion of internal structures such as downstream piping, and low-pressure turbines.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a power generation plant, Fig. 2 is a schematic cross-sectional view showing a conventional moisture separator, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is a diagram of a moisture separator according to the present invention. FIG. 5 and FIG. 6 are schematic sectional views showing other embodiments of the present invention. 20... Body, 21... Moisture separation means, 22...
...Steam inlet, 23...Drain outlet, 24...Steam outlet, 26...Tray, 27...Weir, 28...
Drain reservoir, 29... Drain tank, 30... Drain discharge pipe, 31... Orifice, 32... Bypass pipe, 33... On-off valve, 34... First stage reheater, 35... Second stage reheater Heater.

Claims (1)

[Claims] 1. Moisture separation means is provided inside the body, and
The body has a steam inlet and a drain outlet in the lower part, and a steam outlet in the upper part, and the moisture in the steam flowing into the body from the steam inlet is separated by the moisture separating means. In a moisture separator that receives drain water in a tray at the bottom of the moisture separator and discharges it from a drain outlet to a drain tank outside the fuselage, the drain separated from the steam at the steam inlet is installed on the fuselage wall near the steam inlet. A weir is provided to prevent backflow of water, and a drain reservoir is formed at the bottom of the body by the weir, and a drain discharge pipe is provided on the bottom wall of the body to discharge the drain from the drain reservoir to the drain tank. In the middle of the tube
A moisture separator comprising: an orifice for adjusting the amount of drain discharge; and a bypass pipe bypassing the orifice and having an on-off valve interposed therebetween. 2. The moisture separator according to claim 1, wherein the drain tank is directly attached to a drain outlet. 3. In claim 1, between the moisture separation means in the body and the steam outlet, there is provided a reheating means using extracted steam from a high-pressure turbine as a heat source and steam from a steam generator as a heat source. A moisture separator characterized in that it is equipped with reheating means.