JPH0590163U - Condenser - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the water curtain spray water amount during normal operation is set to zero, the occurrence of water hammer in the water curtain spray pipe during dump load is prevented. [Structure] A gas supply device 11 for supplying non-condensable gas to the water curtain spray pipe 3 is provided when a dump load is applied. That is, during normal operation, both the water curtain spray source valve 5 and the gas inlet valve 14 are closed. When the dump load is applied, the main valve 5 is opened and at the same time, the gas inlet valve 14 is opened via the control signal line 15. As a result, the condensate flows into the water curtain spray pipe 3, and at the same time, the non-condensed gas is sent from the gas tank 13 to the water curtain spray pipe 3 through the gas feed pipe 12, and the instantaneous pressure generated by the inflow of the condensate is sent. Absorb by the gas that entered. This gas feeding time is the time (several seconds) until the condensed water is sprayed from the spray nozzle 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a condenser applied to a steam turbine plant, and more specifically, to a technique for preventing a water hammer from being generated at a dump load in a water curtain spray pipe arranged at an upper part of a body of the steam turbine plant. ..

[0002]

[Prior Art]

 In a condenser applied to a steam plant for thermal power and nuclear power generation, a large number of cooling pipes are built in the body of the condenser, and steam turbine exhaust flowing outside the cooling pipe is cooled by cooling water flowing inside the cooling pipe (usually Is cooled by seawater) and condensed.

FIG. 3 shows an example of a conventional condenser, and a water curtain spray pipe 3 is arranged above a dump pipe 2 provided inside the intermediate body 1 of the condenser. The water curtain spray pipe 3 has a large number of spray nozzles 4 inside the vessel, and a water spray main valve 5 and a water curtain spray bypass orifice 6 are provided in parallel outside the vessel. ing. In addition, 7 is a cooling pipe group and 8 is a condenser tube plate.

In the condenser configured as described above, high-temperature steam flows in addition to the turbine exhaust from the dump pipe 2 in the upper part of the condenser body at the time of plant startup, shutdown, and load shedding. From the viewpoint of protecting the parts inside the condenser, at the time of a dump load, the water container spray valve 5 is opened to allow the condensate to flow into the water curtain spray pipe 3 provided at the upper part of the dump pipe 2, Is sprayed from a large number of spray nozzles 4 and cooled to prevent the steam from being wound up.

[0005]

[Problems to be solved by the device]

 In a condenser equipped with such a water curtain spray pipe 3, however, when the curtain spray water spray amount during normal operation is set to zero and the water curtain spray pipe 3 is emptied, Water hammer may occur. In particular, in this case, the water curtain spray pipe 3 is filled with saturated steam, and when the condensate flows in, part of this saturated steam condenses as the pressure rises, so the possibility of water hammer is higher. Become.

Therefore, in order to prevent the occurrence of this water hammer, conventionally, a constant amount of condensate is passed through the water car spray pipe 3 at all times, that is, not only at the time of dump load but also at the time of normal operation to sprinkle water. The water curtain spray pipe 3 is filled with water. However, in such a method, during normal operation, the water droplets sprayed from the water curtain spray pipe 3 were accelerated by the high-speed turbine exhaust flow and collided with the internal parts of the condenser, causing erosion damage. ..

The present invention has been made to solve the above-described problems of the prior art, and in order to prevent erosion damage due to collision of water droplets on the internal parts of the condenser, a water curtain spray during normal operation is provided. An object of the present invention is to provide a condenser that can prevent the occurrence of water hammer in the water curtain spray piping even when the amount of water sprayed is zero.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention relates to a condenser having a water curtain spray pipe arranged above a dump pipe provided in an upper part of a fuselage, and the water curtain spray pipe is provided at the time of dump load. It is equipped with a gas feeding device that feeds non-condensed gas.

[0009]

[Action]

 According to the above means, the water curtain spray water amount is set to zero during normal operation, and at the time of dump load, the non-condensable gas is sent into the water curtain spray pipe at the same time as the condensate inflow to feed the water curtain spray pipe. The gas absorbs the instantaneous pressure generated by the condensate flowing into the spray pipe, and prevents the temporary high pressure, that is, the water hammer.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a diagram showing a state of the water curtain spray system in a condenser according to the present embodiment during normal operation, and FIG. 2 is a diagram showing a state of the water curtain spray system under a dump load. In these figures, the same parts as those shown in FIG. 3 are designated by the same reference numerals, and duplicated description will be omitted.

As shown in FIGS. 1 and 2, according to the present invention, a gas feeding device 11 for feeding non-condensable gas to the water curtain spray pipe 3 at the time of dump load is installed. That is, according to this embodiment, the closed tip of the conventional water curtain spray pipe 3 shown in FIG. 3 is opened, and one end of the gas inlet pipe 12 is connected to this open end. The other end of the inlet pipe 12 is connected to the gas tank 13, and a gas inlet valve 14 is provided in the middle thereof, and the gas inlet valve 14 is connected to the water-curtain spray source valve 5 via a control signal line 15. Are electrically connected.

During normal operation, as shown in FIG. 1, the water curtain spray source valve 5 and the gas inlet valve 14 are both closed, so that no condensate flows into the water curtain spray pipe 3 and the non-condensed gas flows. Is not sent.

On the other hand, at the time of dump load, as shown in FIG. 2, when the water curtain spray source valve 5 is opened, at the same time, the gas inlet valve 14 is also opened via the control signal line 15, so that the condensate is not condensed. At the same time as flowing into the water curtain spray pipe 3, the non-condensed gas is sent from the gas tank 13 to the water curtain spray pipe 3 through the gas inlet pipe 12. With this, the instantaneous pressure generated by the condensate flowing into the water curtain spray pipe 3 at the time of dump load is absorbed by the non-condensable gas sent into the pipe 3 to prevent the occurrence of water hammer. Can

The gas feeding time is set to the time (several seconds) until the condensed water is sprayed from the spray nozzle 4, and then the gas feeding valve 14 is fully closed.

[0015]

[Effect of the device]

 As described above, according to the present invention, in a condenser in which a water curtain spray pipe is arranged above a dump pipe provided in an upper part of a fuselage, a non-condensation is caused in the water curtain spray pipe during dump load. A gas supply device for supplying gas is installed to keep the water curtain spray sprinkling volume at zero during normal operation, and at the time of dump load, non-condensing gas is sent into the water curtain spray pipe at the same time as condensate inflow. By entering the gas, the gas absorbs the instantaneous pressure generated by the condensate flowing into the water curtain spray pipe, and it is possible to prevent the temporary generation of high pressure, that is, the generation of water hammer. Further, since the water curtain spray water spray amount is zero during the normal operation, it is possible to prevent the erosion damage due to the water droplet collision of the internal parts of the condenser.

[Brief description of drawings]

FIG. 1 is a diagram showing a state during normal operation of a water curtain spray system in a condenser according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state of the water curtain spray system shown in FIG. 1 under a dump load.

FIG. 3 is a diagram showing a water curtain spray system in a conventional condenser.

[Explanation of symbols]

 1 Intermediate condenser body 2 Dump pipe 3 Water curtain spray piping 4 Spray nozzle 5 Water curtain spray source valve 7 Cooling pipe group 8 Condenser tube plate 11 Gas inlet device 12 Gas inlet pipe 13 Gas tank 14 Gas inlet valve 15 Control signal line

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A condenser comprising a water curtain spray pipe arranged above a dump pipe provided in an upper part of a fuselage, wherein a gas feed for feeding a non-condensed gas into the water curtain spray pipe during a dump load. A condenser characterized by having an inlet device installed.