CN111302539B - A condensate circulation device for nuclear power plants - Google Patents

Abstract

The invention discloses a condensed water circulating device for a nuclear power station, which is connected with a secondary circulating pump and a condensing tank, wherein the circulating device comprises a filter tank, a liquid storage tank, a waste liquid tank and a shunt pipe group, the filter tank comprises a tank body, a filter layer is arranged at the bottom of the tank body, an overflow port is arranged on the side surface of the tank body, the outer end of the overflow port is positioned above the liquid storage tank, the bottoms of the filter layer, the waste liquid tank and the condensing tank are all connected onto the shunt pipe group, and the side surface of the bottom of the. In the shunt tube group: the tee joint is respectively connected with one end of a water inlet pipe, a sewer pipe and a siphon pipe, the other end of the water inlet pipe is connected to the bottom of the tank body, the other end of the sewer pipe is connected to the bottom of the condensate tank, the siphon pipe is a section of pipe body which ascends first and then descends, the highest point of the siphon pipe is higher than the overflow port and lower than the bottom of the condensate tank, the lowest point of the siphon pipe is lower than the bottom of the filter tank, a vacuum breaking pipe is arranged from the highest point of the siphon pipe to the.

Description

A condensate circulation device for nuclear power plants

technical field

The invention relates to the field of condensed water circulation equipment, in particular to a condensed water circulation device for nuclear power plants.

Background technique

In a general nuclear power generation system, there are a primary circulation system and a secondary circulation system. The primary circulation system is the part where the reactor is located. This part also has the main heat exchanger, the primary circulation pump and the primary circulation pipe. This part Surrounded by thick concrete, the heat in the reactor is transferred to the main heat exchanger through the primary circulation pipe. The secondary circulation system is the system where the steam turbine and generator are located, as well as the secondary circulation pipe. The condensing tank on the path is The water from the condensing pipe is cooled to a liquid state, and is pumped by the secondary circulation pump for circulation. Due to the long pipeline and the existence of two power machines on the path, the secondary circulation pump and the steam turbine, the steam may flow on its flow path. It will bring out some rust or metal objects on the inner wall of the pipeline, and may also be mixed with some organic debris such as the secondary circulating pump and the bearing lubricating oil on the steam turbine. After these debris is mixed with steam or condensed water, if not treated. , it may reach the main heat exchanger. If it accumulates or scales in the main heat exchanger, it is very troublesome to clean up.

There is no suitable circulating filtration system in the prior art, but by choosing a better material that is not easily corroded for the construction of the circulating pipeline, it also makes a big fuss about the sealing performance of the lubricating oil between the circulating pump and the steam turbine, although it can prevent rust and corrosion. However, after long-term use, impurities will still be mixed into the circulating water, and then reach everywhere on the circulating pipeline, especially the main heat exchanger, causing fouling hazards.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a condensed water circulation device for a nuclear power plant to solve the problems in the prior art.

To achieve the above object, the present invention provides the following technical solutions:

A condensed water circulation device for a nuclear power station is connected with a secondary circulation pump and a condensing tank. The condensed water circulation device includes a filter tank, a liquid storage tank, a waste liquid tank and a branch pipe group. The filter tank includes a tank body, and the bottom of the tank body is provided with a filter layer, There is an overflow port on the side of the tank body. The outer end of the overflow port is located above the liquid storage tank. The bottom of the filter layer, the waste liquid tank and the bottom of the condensation tank are all connected to the shunt pipe group. The bottom side of the liquid storage tank is connected to the secondary circulation. Pump.

Filtration is achieved by adding components with filtering function between the condensing tank and the secondary circulating pump. A filter layer is set in the filter tank, and the condensed water flowing down from the condensing tank passes through the filter layer from bottom to top. The debris is filtered and accumulated in the shunt pipe group. When there are many debris, etc., the water body below the overflow port in the filter tank is used to pass through the filter layer from top to bottom, and the debris is washed down and passed through the shunt pipe. The group is discharged to the waste liquid tank, and the waste liquid tank can be disposed of regularly.

Further, the shunt pipe group includes a water inlet pipe, a tee, a down pipe and a siphon, and the tee is connected to one end of the water inlet pipe, the down pipe and the siphon pipe, the other end of the water inlet pipe is connected to the bottom of the tank, and the other end of the down pipe is connected to the bottom of the tank. At the bottom of the condensing tank, the siphon is a pipe that rises first and then descends. The highest point of the siphon is higher than the overflow port and lower than the bottom of the condensing tank. The lowest point of the siphon is lower than the bottom of the filter tank. The highest point of the siphon reaches the inside of the tank. There is a broken hollow tube, and the end of the broken hollow tube inserted into the inside of the tank is lower than the overflow port.

The water inlet pipe, the sewer pipe and the siphon pipe are respectively connected to the tee, and the tee becomes the intersection of the main circulation and the waste liquid. Since the highest part of the siphon pipe is located between the overflow port and the bottom of the condensing tank, in the normal flow state The water flowing down from the bottom of the condensing tank passes through the water inlet pipe, the filter layer, and the tank body and then flows out from the overflow port, which is a low-resistance priority path. will increase, so that the flow resistance from the bottom of the condensing tank to the overflow port increases slowly, and when it increases beyond the bottom of the condensing tank to the highest point of the siphon, the highest point of the siphon is already full of liquid, and the liquid crosses the highest point of the siphon and begins to When the descending section falls, since the bottom end of the siphon pipe is lower than the filter tank, the siphon from the bottom of the filter tank to the waste liquid tank is established, and the liquid in the filter tank begins to flow in the reverse direction and is discharged to the waste liquid tank through the siphon pipe. The flowing liquid washes away the sundries accumulated in the filter layer. When there are not many sundries mixed into the condensed water on the pipeline of the secondary circulation system and the power machine, but the main heat exchanger is sensitive to sundries, a higher temperature can be selected. The fine filter layer, so that as long as a little debris is filtered out in the filter layer, the backwash will be carried out to prevent the fine debris from passing through the filter layer. When the water level inside the filter tank drops to the bottom end where the hollow tube is inserted into the tank body, the gas inside the filter tank reaches the highest point of the siphon through the hollow tube, destroying the siphon.

Further, the condensed water circulation device also includes a cover frame, the cover frame wraps the filter tank, the liquid storage tank, the waste liquid tank and the branch pipe group to form a closed space, and the connecting pipeline between the liquid storage tank and the secondary circulating pump passes through the cover frame. The wall surface, the connecting pipeline between the shunt pipe group and the condensing tank passes through the wall surface of the cover frame, the inside of the cover frame is filled with inert gas, and a vacuum pump or compressor is set on the wall surface of the cover frame to adjust the ambient pressure inside the cover frame.

The pressure of the condensate when it is discharged from the condensate tank is likely not to be atmospheric pressure according to the parameter requirements of the power generation system. Therefore, if the design pressure of the condensate is higher than the atmospheric pressure, it will lose a large amount of water when it is directly discharged into an open liquid storage tank. Energy, the secondary circulating pump needs to do more work to send the condensate pump into the main heat exchanger, and if it is directly exposed to the air, it may be mixed with dissolved oxygen, which is not conducive to the circulating water in the main heat exchanger. The heat exchange inside the main heat exchanger will also lead to oxidation corrosion inside the main heat exchanger. If the design pressure here is lower than the atmospheric pressure, it will affect the flow of condensed water in the filter tank. Instead, the atmospheric reverse flow enters the condensate tank from bottom to top through the branch pipe group, which should not happen. Therefore, in order to match the pressure of the condensed water discharged from the condensing tank under different design conditions, a cover frame is used to wrap the filter tank, the liquid storage tank, the waste liquid tank and the branch pipe group, and the appropriate ambient pressure is constructed through the vacuum pump or compressor on the wall. , to facilitate the flow of condensed water in and between tanks. The pressure at the liquid level of the waste tank and the ambient pressure at the overflow port also need to be matched accordingly to meet the siphon conditions.

Further, electrodes are provided on the water inlet pipe. The electrode can electrolytically separate the metal ions and acid ions in the condensed water into metal and gas molecules. The metal is filtered by the filter layer, and the gas molecules are precipitated out of the water and collected to the high point of the siphon. In this way, the condensed water after passing through the water inlet pipe and the filter layer is more pure.

Further, an on-off valve is provided on the sewer pipe, a level sensor is provided on the wall of the highest point of the siphon pipe, and the level sensor is electrically connected with the on-off valve.

In the process of siphoning, it is best to disconnect the condensing tank and the tee, otherwise, a large amount of water will be discharged from the sewer pipe when the siphon occurs, until the siphon is disconnected, this part of the water will also be discharged to the waste liquid tank through the siphon pipe However, this part of the water contains only a small amount of debris and should not be wasted. Therefore, in the present invention, an on-off valve is provided on the sewer pipe to perform on-off, and a material level sensor is arranged on the top of the siphon pipe, and the material level sensor detects whether there is a water body there. A signal is given to close the on-off valve and disconnect the water from the sewer pipe. After the siphon is over, there is no more liquid at the highest position of the siphon pipe, the on-off valve is opened again, and the sewer pipe discharges condensed water downward.

As an optimization, the pipes of the downpipe and the descending section of the siphon are provided with fine-hole tube cores. When the siphon pipe and the downpipe are thick, the gas will accumulate in the shunt pipe group. During the siphoning process, the gas accumulated on the top of the siphon pipe may not be exhausted, because the liquid going up from the tee passes the highest point of the siphon pipe and then flows down. When the gas cannot be completely squeezed down on the thicker pipe, the gas will disperse in the form of bubbles and float up and accumulate above the siphon. The hole tube core is a flow tube composed of honeycomb thin tubes. Due to the viscous effect of the surface of the water, the gas cannot push up the water body under the thinner tube diameter and then float up. Therefore, the gas in the siphon tube can be absorbed during the siphoning process. It should be fully exhausted, including the gas molecules produced by the electrode electrolysis of acid ions. It should be noted that the flow of gas in the empty pipe should flow in one direction, that is, it should only flow from the filter tank to the siphon, preferably not in two directions, to prevent oxygen, carbon dioxide, etc. in the siphon. Through the broken pipe to the filter tank,

As an optimization, the waste liquid tank is filled with oxygen-absorbing liquid, and the waste liquid tank includes a discharge pipe extending outward from the bottom or side of the main tank, and the discharge pipe has at least one inflow and one outflow direction.

The waste liquid tank wrapped by the cover frame is inconvenient to discharge the waste liquid, so it is carried out through the pipeline, and the cover frame creates a closed environment. The waste liquid and oxygen and other gas molecules are absorbed by the oxygen-absorbing liquid, preventing them from emitting into the space in the cover frame and reaching the liquid storage tank.

Further, high temperature steam is introduced from the outside on the water inlet pipe. The condensed water discharged from the condensing tank is often in an unsaturated state. In this state, more gas is dissolved. After mixing the condensed water with high-temperature steam, it is adjusted to become saturated water under the local environmental pressure, which can promote more The dissolved gas is collected in the siphon, and the subsequent condensate is more pure.

For the flow continuity of the water body in the secondary circulation system, the components contained in the cover frame are set in two parts, which are operated in parallel, and the secondary circulation pump is used to adjust the flow and stabilize the flow.

Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention conducts shunting treatment on the liquid flowing down from the condensation tank through the filter tank, the liquid storage tank and the waste liquid tank, and the filter layer filters the conventionally flowing liquid, and the pure liquid is filtered. The condensed water overflows from the overflow port and falls into the liquid storage tank, and the condensed water in the liquid storage tank is pumped by the secondary circulating pump for power generation cycle; when there are many debris accumulated on the filter layer, the liquid level in the ascending section of the siphon pipe continues to rise until it crosses the The highest point, after crossing the highest point, the siphon is established, the liquid in the filter tank flows through the filter layer in reverse, and the sundries are washed away, so as to carry out the filtration process of the next cycle; the electrode set in the water inlet pipe removes the metal ions in the condensed water With acid ions, it becomes molecular and precipitates condensed water, which is collected in the water inlet pipe and siphon pipe, and is discharged to the waste liquid tank during the siphoning process.

Description of drawings

In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments and in conjunction with the accompanying drawings.

Figure 1 is a simple structural schematic diagram of the power generation cycle of a nuclear power plant;

Fig. 2 is the basic structure schematic diagram of the present invention;

3 is a schematic structural diagram of the present invention with a pore tube core, a cover frame, an electrode, and a level gauge;

Fig. 4 is the flow schematic diagram under the normal circulation state of the present invention;

FIG. 5 is a schematic flow diagram of the present invention in the state of filtering and removing slag.

In the figure: 1-filter tank, 11-tank body, 12-filter layer, 13-overflow port, 2-liquid storage tank, 3-waste liquid tank, 31-discharge pipe, 4-distribution pipe group, 41- Inlet pipe, 42-Tee, 43-Drain pipe, 44-Siphon pipe, 49-Small-hole tube core, 5-On-off valve, 6-Breaking pipe, 71-Housing frame, 72-Electrode, 73-Level meter , 8-secondary circulation system, 81-steam turbine, 82-generator, 83-condensation tank, 84-condenser pipe, 85-secondary circulation pump, 86-secondary circulation pipe, 9-first-level circulation system, 91- Reactor, 92-main heat exchanger, 93-first-stage circulating pump, 94-first-stage circulating pipe.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1 and 2, a condensate water circulation device for a nuclear power plant is connected to a secondary circulating pump 85 and a condensate tank 83. The condensate water circulation device includes a filter tank 1, a liquid storage tank 2, a waste liquid tank 3 and a branch pipe group 4, The filter tank 1 includes a tank body 11, the bottom of the tank body 11 is provided with a filter layer 12, the side of the tank body 11 is provided with an overflow port 13, the outer end of the overflow port 13 is located above the liquid storage tank 2, the bottom of the filter layer 12, the waste liquid The bottoms of the tank 3 and the condensing tank 83 are both connected to the branch pipe group 4 , and the bottom side of the liquid storage tank 2 is connected to the secondary circulating pump 85 .

In a general nuclear power generation system, there are a primary circulation system 9 and a secondary circulation system 8. The primary circulation system 9 is the part where the reactor 91 is located, and this part also has a main heat exchanger 92, a primary circulation pump 93 and a primary circulation pump 93. The primary circulation pipe 94, this part is surrounded by thick concrete, the heat in the reactor 91 is transferred to the main heat exchanger 92 through the primary circulation pipe 94, the secondary circulation system 8 is the system where the steam turbine 81 and the generator 82 are located, There is also a secondary circulation pipe 86. The condensation tank 83 on the path is cooled to a liquid state by the water from the condensation pipe 84, and is pumped by the secondary circulation pump 85 for circulation. Because the pipeline is long, and there are two Power machine - secondary circulating pump 85 and steam turbine 81, steam may take out some rust or metal objects on the inner wall of the pipeline in its flow path, and may also be mixed with some secondary circulating pump 85 and steam turbine 81 Bearing lubrication Organic debris such as oil, which is mixed with steam or condensed water, may reach the main heat exchanger 92 if it is not treated. If it accumulates or scales in the main heat exchanger 92, it is very troublesome to clean up. The present invention filters out the sundries on the secondary circulation by means of filtration to prevent them from reaching the main heat exchanger 92 .

As shown in FIG. 2 , the filtration is realized by adding a component with a filtering function between the condensing tank 83 and the secondary circulating pump 85. The filtering layer 12 is arranged in the filtering tank 1, and the condensed water flowing down from the condensing tank 83 flows from the Through the filter layer 12 from bottom to top, the water-insoluble sundries are filtered and accumulated in the shunt pipe group 1. When there are many sundries, etc., the water body below the overflow port 13 in the filter tank 1 is used from the top to the top. After passing through the filter layer 12, the debris is washed down and discharged to the waste liquid tank 3 through the shunt pipe group 4, and the waste liquid tank 3 can be treated regularly.

As shown in FIG. 2 , the shunt pipe group 4 includes a water inlet pipe 41 , a tee 42 , a downwater pipe 43 and a siphon 44 , and the tee 42 is respectively connected to one end of the water inlet pipe 41 , the downwater pipe 43 and the siphon pipe 44 , and the other end of the water inlet pipe 41 . Connected to the bottom of the tank 11, the other end of the downpipe 43 is connected to the bottom of the condensing tank 83, the siphon 44 is a section of pipe that rises first and then descends, and the highest point of the siphon 44 is higher than the overflow port 13 and lower than the bottom of the condensation tank 83. , the lowest point of the siphon 44 is lower than the bottom of the filter tank 1 , the highest point of the siphon 44 to the inside of the tank 11 is provided with a hollow pipe 6 , and one end of the hollow pipe 6 inserted into the tank 11 is lower than the overflow port 13 .

The water inlet pipe 41, the down water pipe 43 and the siphon pipe 44 are respectively connected to the tee 42, and the tee 42 becomes the intersection of the main circulation and the waste liquid, because the highest part of the siphon pipe 44 is located between the overflow port 13 and the bottom of the condensing tank 83 Therefore, under normal flow conditions, as shown in Figure 4, the water body coming down from the bottom of the condensing tank 83 passes through the water inlet pipe 41, the filter layer 12, the tank body 11 and then flows out of the overflow port 13, which is a low-resistance priority path. When more debris is filtered in the filter layer 12, the resistance of the water flow through the filter layer 12 will increase, so that the flow resistance from the bottom of the condensing tank 83 to the overflow port increases slowly, and increases to exceed the bottom of the condensing tank 83 to When the highest point of the siphon pipe 44 is at the highest point, the highest point of the siphon pipe 44 is already filled with liquid, and when the liquid crosses the highest point of the siphon pipe 44 and begins to fall in the descending section, since the bottom end of the siphon pipe 44 is lower than the filter tank 1, the flow from the filter tank 1. The siphon from the bottom to the waste liquid tank 3 is established, and the liquid in the filter tank 1 begins to flow in the reverse direction and is discharged to the waste liquid tank 3 through the siphon 44. The liquid in the reverse flow washes away the debris accumulated in the filter layer 12. When there are not many sundries mixed into the condensed water on the pipeline of the stage circulation system 8 and the power machine, but when the main heat exchanger 92 is sensitive to sundries, a finer filter layer 12 can be selected. If the impurities are filtered out in the filter layer 12, then backwashing will be performed to prevent the fine debris from passing through the filter layer 12. When the water level inside the filter tank 11 drops to the bottom end where the hollow pipe 6 is inserted into the tank body 11 , the gas inside the filter tank 11 reaches the highest point of the siphon pipe 44 through the hollow pipe 6 and destroys the siphon.

As shown in FIG. 3 , the condensed water circulation device also includes a cover frame 71, which wraps the filter tank 1, the liquid storage tank 2, the waste liquid tank 3 and the branch pipe group 4 to form a closed space. The liquid storage tank 2 and the secondary circulation pump The connecting pipeline between 85 passes through the wall surface of the cover frame 71, the connecting pipeline between the branch pipe group 4 and the condensation tank 83 passes through the wall surface of the cover frame 71, the inside of the cover frame 71 is filled with inert gas, and a vacuum pump is installed on the wall surface of the cover frame 71 Or the compressor adjusts the ambient pressure inside the casing frame 71 .

The pressure of the condensed water when it is discharged from the condensing tank 83 is likely not to be atmospheric pressure according to the parameter requirements of the power generation system. Therefore, if the design pressure of the condensed water is higher than the atmospheric pressure, it will lose a relatively large amount of water when it is directly discharged into an open liquid storage tank 2. If the energy is large, the secondary circulating pump 85 needs to do more work to pump the condensate pump into the main heat exchanger 92. Moreover, if it is directly exposed to the air, it may be mixed with dissolved oxygen, which is not conducive to the circulation of the water. The heat exchange in the main heat exchanger 92 also causes oxidation and corrosion in the main heat exchanger 92 . If the design pressure here is lower than the atmospheric pressure, the flow of condensed water in the filter tank 1 will be affected. Instead, the atmospheric reverse flow will enter the condensing tank 83 from bottom to top through the branch pipe group 4, which should not happen. . Therefore, in order to match the pressure of the condensed water discharged from the condensing tank 83 under different design conditions, a cover frame 71 is used to wrap the filter tank 1, the liquid storage tank 2, the waste liquid tank 3 and the shunt pipe group 4, and the vacuum pump on the wall or the compression The machine is constructed with suitable ambient pressure to facilitate the flow of condensed water in and between tanks. The pressure at the liquid level of the waste liquid tank 3 and the ambient pressure at the overflow port 13 also need to be matched accordingly to satisfy the siphon condition.

As shown in FIG. 3 , an electrode 72 is provided on the water inlet pipe 41 . The electrode 72 can electrolytically separate the metal ions and acid ions in the condensed water into metal and gas molecules. In this way, the condensed water after passing through the water inlet pipe 41 and the filter layer 12 is more pure.

As shown in FIG. 3 , an on-off valve 5 is provided on the sewer pipe 43 , a level sensor 73 is provided on the wall of the highest point of the siphon pipe 44 , and the level sensor 73 is electrically connected to the on-off valve 5 .

In the process of siphoning, it is better to disconnect the connection between the condensation tank 83 and the tee 42, otherwise, the sewer pipe 43 will also discharge a large amount of water when the siphon occurs, until the siphon is disconnected, this part of the water will also be discharged through the siphon pipe 44. To the waste liquid tank 3, however, this part of the water contains only a small amount of debris and should not be wasted. Therefore, in the present invention, the on-off valve 5 is provided on the sewer pipe 43 for on-off, and the level sensor 73 is provided on the top of the siphon pipe 44. The level sensor 73 detects whether there is a water body there, because the presence of a water body at this position means that the siphon is present. The process is in progress, so a signal is given to close the on-off valve 5 and disconnect the water from the sewer pipe 43. After the siphon is completed, there is no more liquid at the highest position of the siphon pipe 44, the on-off valve 5 is opened again, and the sewer pipe 43 is discharged downward. Send condensed water.

As shown in FIG. 3 , the pipes of the descending section of the sewer pipe 43 and the siphon pipe 44 are provided with fine hole tube cores 49 . When the siphon 44 and the downpipe 43 are relatively thick, the gas is accumulated in the shunt pipe group 4. During the siphoning process, the gas accumulated on the top of the siphon 44 may not be exhausted, because the liquid from the tee 42 is passing over the siphon 44. When the highest point then flows down, the gas cannot be completely squeezed down on the thicker pipe, and the gas will disperse in the form of bubbles and float up, and always accumulate above the siphon 44. Therefore, the flow in the downpipe 43 and the siphon 44 decreases. A pore tube core 49 is arranged in the section, and the pore tube core 49 is a flow tube composed of honeycomb-shaped thin tubes. Due to the viscous effect of the surface of the water, the gas cannot push up the water body under the thinner tube diameter and then float up. , the gas in the siphon tube 44 can be fully exhausted during the siphoning process, including the gas molecules generated by the electrolysis of acid ions by the electrode 71. It should be noted that the flow of the gas in the hollow tube 6 should flow in one direction, that is, it should only flow from the filter tank 1 to the The siphon 44 should preferably not flow in both directions, so as to prevent the oxygen, carbon dioxide, etc. in the siphon 44 from reaching the filter tank 1 through the empty pipe 6,

As shown in FIG. 3 , the waste liquid tank 3 contains oxygen-absorbing liquid, and the waste liquid tank 3 includes a discharge pipe 31 extending outward from the bottom or side of the main tank. The discharge pipe 31 has at least one inlet and one outlet. Flow direction.

The waste liquid tank 3 wrapped by the cover frame 71 is inconvenient to discharge the waste liquid, so it is carried out through pipelines, and the cover frame 71 creates a closed environment, and the bottom end of the siphon tube 44 is discharged by the oxygen absorption liquid in the waste liquid tank 3. The waste liquid and oxygen and other gas molecules discharged from the siphon are absorbed by the oxygen-absorbing liquid, preventing them from being emitted into the space in the cover frame 71 and reaching the liquid storage tank 2 .

High temperature steam is introduced into the water inlet pipe 41 from the outside. The condensed water discharged from the condensing tank 83 is often in an unsaturated state. In this state, more gas is dissolved. After mixing the condensed water with high-temperature steam, it is adjusted to become saturated water under the local environmental pressure, which can promote more The dissolved gas is collected in the siphon 44, and the subsequent condensed water is more pure.

For the flow continuity of the water body in the secondary circulation system 8 , the components included in the cover frame 71 are provided in two parts, which are operated in parallel, and the secondary circulation pump 85 is used to adjust the flow and stabilize the flow.

The operating principle of the device is: the condensed water discharged from the condensing tank 83 enters the filter tank 1 through the downpipe 43, the tee 42 and the water inlet pipe 41, and is separated from the sundries from the filter layer 12, and then overflows from the overflow port 13 and falls into In the liquid storage tank 2, the pure condensed water in the liquid storage tank 2 is pumped by the secondary circulating pump 85 for power generation cycle; when a lot of debris is accumulated on the filter layer 12, the liquid level in the ascending section of the siphon pipe 44 continues to rise until it crosses the highest point , after crossing the highest point, the siphon is established, the liquid in the filter tank 1 flows through the filter layer 12 in reverse, and the sundries are washed away, so as to carry out the next cycle of filtration process.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and range of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (6)

1. A condensed water circulation device for a nuclear power plant, connecting a secondary circulating pump (85) and a condensing tank (83), characterized in that: the condensed water circulation device comprises a filter tank (1), a liquid storage tank (2), a waste liquid A tank (3) and a shunt pipe group (4), the filter tank (1) includes a tank body (11), the bottom of the tank body (11) is provided with a filter layer (12), and the side of the tank body (11) is provided with a filter layer (12) The overflow port (13), the outer end of the overflow port (13) is located above the liquid storage tank (2), the bottom of the filter layer (12), the waste liquid tank (3) and the bottom of the condensation tank (83) are all is connected to the shunt pipe group (4), and the bottom side of the liquid storage tank (2) is connected to the secondary circulating pump (85); The shunt pipe group (4) includes a water inlet pipe (41), a tee (42), a downpipe (43) and a siphon (44), and the tee (42) is respectively connected to the water inlet pipe (41) and the downpipe (42). 43) and one end of the siphon pipe (44), the other end of the water inlet pipe (41) is connected to the bottom of the tank (11), the other end of the down water pipe (43) is connected to the bottom of the condensation tank (83), the The siphon pipe (44) is a pipe body that rises first and then descends. The highest point of the siphon pipe (44) is higher than the overflow port (13) and lower than the bottom of the condensation tank (83), and the lowest point of the siphon pipe (44) is lower than the filter tank. (1) Bottom, the highest point of the siphon pipe (44) to the inside of the tank body (11) is provided with a hollow pipe (6), and one end of the hollow pipe (6) inserted into the inside of the tank body (11) is lower than the overflow pipe (11). Orifice (13); The condensed water circulation device further comprises a cover frame (71), the cover frame (71) wraps the filter tank (1), the liquid storage tank (2), the waste liquid tank (3) and the branch pipe group (4) to form a closed space , the connection pipeline between the liquid storage tank (2) and the secondary circulating pump (85) passes through the wall of the cover frame (71), and the connection between the branch pipe group (4) and the condensation tank (83) The pipeline passes through the wall of the cover frame (71), the inside of the cover frame (71) is filled with inert gas, and the wall of the cover frame (71) is provided with a vacuum pump or compressor to adjust the ambient pressure inside the cover frame (71). 2 . The condensed water circulation device for a nuclear power plant according to claim 1 , wherein an electrode ( 72 ) is provided on the water inlet pipe ( 41 ). 3 . 3. The condensed water circulation device for a nuclear power plant according to claim 1, characterized in that: an on-off valve (5) is provided on the downpipe (43), and a wall of the highest point of the siphon (44) is provided with There is a material level sensor (73), and the material level sensor (73) is electrically connected with the on-off valve (5). 4. A condensate water circulation device for a nuclear power plant according to claim 1, characterized in that a fine-hole tube core (49) is provided in the pipes of the downpipe (43) and the descending section of the siphon pipe (44). 5. A condensed water circulation device for a nuclear power plant according to claim 1, characterized in that: the waste liquid tank (3) is filled with oxygen-absorbing liquid, and the waste liquid tank (3) includes a bottom or side surface of the main tank of the waste liquid tank (3). The discharge pipe (31) protruding outward, the discharge pipe (31) at least has a flow direction of one in and one out. 6 . The condensed water circulation device for a nuclear power plant according to claim 1 , wherein the water inlet pipe ( 41 ) introduces high temperature steam from the outside. 7 .

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