JPS633204B2 - - Google Patents

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is an auxiliary equipment for steam generation equipment such as a boiler or a steam converter, which collects used or excess steam as condensate, and Regarding a steam recovery device to be used again as a water source for steam generation,
In particular, the present invention relates to a steam recovery device suitable for improving the steam recovery rate.

(Prior art) Generally, in a nuclear power plant, the first
As shown in the figure, steam generated by steam generation equipment 2 is used for heating equipment and equipment 1. The steam used in the equipment and equipment 1 passes through the trap 3, is recovered as condensate in the steam recovery device 4, and is returned to the water supply tank 5 by the transfer pump (not shown) of the vapor recovery device 4. The water is reused as a water source for steam generation equipment.

As shown in FIG. 2, the conventional steam recovery device is composed of a flash tank 6, a trap 7, a receiver tank 8, a condensate transfer pump 9, etc. and is led to a flash tank 6 where it is flushed. The saturated water after flushing is collected in the receiver tank 8 and then collected in the water supply tank (not shown) by the post-condensate transfer pump 9, while the steam is released into the atmosphere from the vent pipe 11 of the flush tank 6. It is configured to

Generally, pure water is used to supply water to steam generation equipment, and therefore, from an economic standpoint, it is desired to improve the recovery rate of pure water and effectively utilize the pure water.

(Problems to be Solved by the Invention) However, in the conventional equipment, as mentioned above, the steam from the flash tank is directly released into the atmosphere, resulting in a poor steam recovery rate. Environmental deterioration has become a problem.

The present invention has been made in order to solve these conventional problems, and provides a steam recovery device that improves the steam recovery rate and protects the environment by reducing the amount of steam released into the atmosphere. The purpose is to provide.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a steam recovery device for recovering steam generated in a boiler as condensate after utilization, and a flash receiver tank into which the steam after utilization is introduced via a trap; A first vent pipe led out from the gas phase part of the flash receiver tank, a steam condenser introduced into the primary side of the first vent pipe, and a cooling pipe connected to the secondary side of the steam condenser. A second vent pipe is connected to the gas phase on the primary side of this steam condenser and is open to the atmosphere, and one end is connected to the primary side of this steam condenser and the other end is connected to the flash receiver tank. The steam recovery device is characterized in that it is equipped with a drain pipe consisting of a drain pipe, and a condensate transfer pump connected to a flash receiver tank.

(Function) In the vapor recovery device of the present invention, the vapor guided to the flash receiver tank is flashed,
The saturated water after flashing is later transferred by a transfer pump, and the steam after flashing is led to a steam condenser, where it is cooled and condensed to become condensed water, which is then recovered in the flash receiver tank.
Additionally, a vent pipe that is open to the atmosphere is provided to keep the pressure in this system almost constant.

Embodiment The present invention will be described below based on an embodiment shown in FIG.

A level switch 23 is provided in the flash receiver tank 21 to which the return condensate pipe 22 is connected. Also, this flash receiver tank 21
One end of a condensate transfer pipe 25 having a condensate transfer pump 24 interlocked with a level switch 23 is connected to. The other end of this condensate transfer pipe 25 is connected to a water supply tank of steam generation equipment (not shown). The saturated water after being flushed in the flash receiver tank 21 is collected into the water supply tank via the condensate transfer pipe 25.

On the other hand, the flash receiver tank 21 is connected to a steam condenser 27 via a vent pipe 26, and the steam after flashing in the flash receiver tank 21 is transferred to steam via the vent pipe 26 as shown in FIG. It is led to the primary side of the condenser 27 and exchanges heat with the cooling water supplied from the cooling water pipe 28 on the secondary side. The primary side of the steam condenser 27 and the flash receiver tank 21 are connected via a drain pipe 29, and condensate formed by heat exchange is collected into the flash receiver tank 21 through the drain pipe 29. It is becoming more and more like this.

In addition, the symbol 30 in FIG. 3 is the steam capacitor 2.
7 is a vent pipe provided on the primary side of the steam condenser 27, and discharges the steam remaining in the steam condenser 27 to the atmosphere, while at the same time keeping the pressure of the system constant at approximately atmospheric pressure.

Next, the effect will be explained.

The return condensate from the trap (not shown) is several kg/
The water is supplied as saturated water at a pressure of cm ² to the flash receiver tank 21 via a return condensate pipe 22 and a trap. Since the pressure on the flash receiver tank 21 side is close to and constant at atmospheric pressure, the flow is smooth in the trap portion. Then, it is flashed under reduced pressure to become saturated water and saturated steam.

The saturated steam in the flash receiver tank 21 is transferred to the steam condenser 2 via a vent pipe 26.
7, is cooled by the cooling water from the cooling water pipe 28, and is condensed to become condensate. The condensate produced by the steam condenser 27 returns to the flash receiver tank 21 via the drain pipe 29 and is stored at the bottom of the flash receiver tank 21 together with saturated water.

The water stored in the flash receiver tank 21 is transferred to a water supply tank (not shown) via a condensate transfer pipe 25 by a condensate transfer pump 24 whose water level is controlled by a level switch 23, and is used to generate steam. It will be used to supply water to the equipment.

Therefore, by using the device of this embodiment, an additional amount of steam can be recovered by the amount of steam recovered by the steam condenser 27 compared to the conventional device.
This amount of vapor recovery is calculated from the flash receiver tank 2.
This corresponds to the amount of flash steam in 1.
Assuming that the condensate returned from the trap is saturated water with pressure, and the pressure is reduced to atmospheric pressure in the flash receiver tank 21, it is flashed.
As shown in Figure 4, compared to the amount of steam A that can be recovered by the conventional device, there is an excess of steam (approximately 10
15%) of the steam amount B can be recovered.

In addition, in the above embodiment, the steam capacitor 27
Although the case where one stage is provided has been described, two or more stages may be provided.

〔Effect of the invention〕

As described above, according to the present invention, more steam can be recovered compared to conventional devices, the recovery rate of pure water can be improved, and the amount of steam released into the atmosphere can be reduced. This has the effect of being effective in preserving the environment within the power plant.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of boiler steam supply equipment of a nuclear power plant equipped with a steam recovery device, Fig. 2 is a system diagram of a conventional device, Fig. 3 is a system diagram showing an embodiment of the present invention, and Fig. 4 is a graph showing the difference in steam recovery amount between the device according to the present invention and the conventional device. 3, 7... Trap, 21... Flash receiver tank, 22... Return condensate pipe, 24... Condensate transfer pump, 25... Condensate transfer pipe, 26... Vent pipe, 27... Steam condenser, 28...Cooling water pipe, 29...Drain pipe.

Claims (1)

[Claims] 1 In a steam recovery device that recovers steam generated in a boiler as condensate after use, there is a flash receiver tank into which the steam after use is introduced via a trap, and a flash receiver tank where the steam is led out from the gas phase of the flash receiver tank. A first vent pipe, a steam condenser introduced into the primary side of the first vent pipe, a cooling pipe connected to the secondary side of the steam condenser, and a gas phase portion on the primary side of the steam condenser. a second vent pipe which is connected to the air and is open to the atmosphere; a drain pipe which has one end connected to the primary side of the steam condenser and the other end connected to the flash receiver tank; and a drain pipe connected to the flash receiver tank. 1. A steam recovery device comprising: a condensate transfer pump;