CN218333145U

CN218333145U - Take seal structure's demineralized water tank of nuclear power plant

Info

Publication number: CN218333145U
Application number: CN202222001510.3U
Authority: CN
Inventors: 李志静; 丁学娇; 马国建; 李贺强; 刘文芳
Original assignee: China Nuclear Power Engineering Co Ltd
Current assignee: China Nuclear Power Engineering Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2023-01-17
Anticipated expiration: 2032-08-01

Abstract

The utility model relates to a take seal structure's demineralized water tank of nuclear power plant, including the box that is used for storing the demineralized water, the box is connected with demineralized water production line and demineralized water distribution system, is equipped with the flexibility above the water level in the box and floats the top, the flexibility floats top outer fringe and box inner wall sliding contact and seals, and the flexibility floats the top and floats along with the decline of the interior water level of box or rise and float, realizes the double-phase isolation of gas-liquid in the box. The utility model provides a water tank sealing scheme is high to the coverage rate of water tank surface of water, simple to operate, and can effectively reduce the contaminated risk of demineralized water, and fail safe nature and economic nature are higher, satisfy the requirement of the nuclear power technology of the third generation.

Description

Take seal structure's demineralized water tank of nuclear power plant

Technical Field

The utility model belongs to the technical field of the nuclear power plant feedwater, concretely relates to take seal structure's demineralized water tank of nuclear power plant.

Background

The desalted water distribution system is one of auxiliary systems of the nuclear power plant and provides the desalted water with quality and quantity guarantee for the whole plant. Because the difference of user operating mode, each user is great to the fluctuation of demand of demineralized water, consequently sets up the play water of demineralized water production line of demineralized water case storage to play the effect of water yield control. The effective volume of the system meets the amount of desalted water required by the heat discharged by the waste heat of the reactor in all unit accident states of a whole plant, the desalted water tank in the past engineering is directly communicated with the atmosphere, no sealing measure is adopted, pollutants such as carbon dioxide, dust and the like in the air enter the water tank through a vent pipe at the top of the water tank, the carbon dioxide and water are subjected to dissolution ionization reaction to deteriorate the water quality, and in order to ensure the requirements of each process user on the quality of the desalted water, a scheme suitable for sealing the water tank in the desalted water distribution system of the nuclear power plant needs to be provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art not enough, provide a take seal structure's demineralized water tank of nuclear power plant, avoid water and air direct contact in the water tank, lead to the carbon dioxide in the air to get into the water tank through the air vent and take place the ionization with water and dissolve, cause quality of water to worsen.

The technical scheme of the utility model as follows: the utility model provides a take seal structure's demineralized water tank of nuclear power plant, is including the box that is used for storing the demineralized water, the box is connected with demineralized water production line and demineralized water distribution system, is equipped with the flexibility above the water level in the box and floats the top, the flexibility floats top outer fringe and box inner wall sliding contact and seals, and the flexibility floats the top and floats along with the decline or the rising of water level in the box, realizes the double-phase isolated of gas-liquid in the box.

Further, as described above, the nuclear power plant demineralized water tank with the sealing structure, wherein the main body cover of the flexible floating roof is a membrane with sufficient strength and airtightness, a plurality of floating blocks are arranged below the membrane to enable the membrane to float on the water surface, the outer edge of the membrane is fixed by a rigid ring, a rubber ring is arranged on the periphery of the ring, and the rubber ring is in sliding contact with and seals the inner wall of the cylindrical tank body.

Further, the film is a single-layer film of an organic polymer material.

Further, as above, the nuclear power plant desalting water tank with the sealing structure, wherein the water inlet pipe of the tank body is of a 90-degree downward-bending structure and is arranged below the flexible floating roof, and the upper part of the outer wall of the tank body is provided with an overflow pipe which is connected with a sewage system of a nuclear power plant.

Further, the nuclear power plant demineralized water tank with the sealing structure as described above, wherein the water outlet pipe of the tank body is connected with the water pump suction pipe of the demineralized water distribution system for supplying water to the demineralized water user, and a metal hose is mounted on the water outlet pipe, and the metal hose can absorb thermal expansion and prevent vibration impact and vibration transmission; and the water outlet pipe is also provided with a sampling pipe.

Further, the nuclear power plant demineralized water tank with the sealing structure is characterized in that a circulating water return pipe is arranged at the lower part of the tank body and is used as a water pump return pipeline of the demineralized water distribution system.

Further, the nuclear power plant demineralized water tank with the sealing structure is characterized in that a vent hole for preventing overpressure of the tank is formed in the top of the tank body.

Further, as above, the nuclear power plant's demineralized water tank of taking seal structure, wherein the bottom half is close to the position and the box top of inlet tube are equipped with the manhole respectively, and the manhole of bottom is used for overhauing water tank and inlet tube, and the manhole at top is used for the sample and detects demineralized water quality of water.

Furthermore, as above the nuclear power plant desalting water tank with the sealing structure, wherein the bottom of the tank body is provided with a vent pipe for venting water in the water tank during maintenance, and the vent pipe is provided with an emergency water taking connector.

Furthermore, as above, the nuclear power plant desalting water tank with the sealing structure, wherein an ultrasonic level meter is arranged outside the tank body and used for controlling the on-off of the water tank water replenishing valve and feeding back the water tank liquid level to the control chamber in time.

The utility model has the advantages as follows: the utility model provides a take seal structure's demineralized water tank of nuclear power plant, measures such as concretely relates to demineralized water tank, attached pipe fitting, flexible floating roof, ultrasonic wave level gauge. This technical scheme adopts the flexible top that floats of single membrane formula, has that the water tank coverage is high, simple to operate, non-maintaining, extension and resilience performance are good, to advantages such as water tank shape and structural suitability strong, low price, can effectively slow down demineralized water quality of water pollution simultaneously, guarantees the quality of water of the required demineralized water of the important system of safety, improves the utilization ratio of demineralized water.

Drawings

FIG. 1 is a schematic view of a demineralized water tank according to an embodiment of the present invention;

figure 2 is a top view of a demineralized water tank according to an embodiment of the present invention.

In the figure: 1-box body, 2-water inlet pipe, 3-emptying pipe, 4-water outlet pipe, 5-vent hole, 6-flexible floating roof, 7-overflow pipe, 8-circulating water return pipe, 9-sampling pipe, 10-ultrasonic liquid level meter, 11-manhole, 12-single layer film, 13-floating block, 14-rubber ring and 15-emergency water taking interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

As shown in figures 1 and 2, the desalting water distribution system of the nuclear power plant is provided with two sets of effective volumes of 500m ³ The vertical cylindrical desalted water tank is used for storing the effluent of the desalted water production line so as to meet the requirement of fluctuation of water demand of downstream users. The accessory of the demineralized water tank comprises: box 1, inlet tube 2, blow-down pipe 3, outlet pipe 4, air vent 5, flexible floating roof 6, overflow pipe 7, circulation wet return 8, sampling tube 9, ultrasonic wave level gauge 10, manhole 11, single membrane 12, floating block 13, rubber ring 14, emergent gettingA water interface 15.

The demineralized water dwell time in the box 1 of demineralized water tank is longer, and is equipped with air vent 5 at the water tank top, atmosphere and surface of water direct contact, if do not have sealed measure, then after operation a period, carbon dioxide and dust directly get into the water tank in the air, and carbon dioxide and water take place ionization reaction, lead to water pH value in the water tank to obviously reduce, and the conductivity increases, and the dust gets into the aquatic, worsens quality of water.

As a preferred embodiment, the sealing scheme of the demineralized water tank provided by the embodiment is as follows, the flexible floating roof 6 is a single-layer membrane type flexible floating roof, the main body covering of the flexible floating roof is a membrane with enough strength and air tightness so as to isolate gas phase and liquid phase, the flexible floating roof 6 comprises a single-layer membrane 12, a floating block 13 and a rubber ring 14, the outer edge of the single-layer membrane 12 is fixed by a plurality of layers of rigid rings, and the rubber ring 14 is fixed on the periphery of the rings so as to ensure that the outer edge of the flexible floating roof is in sliding contact with and sealed with the inner wall of the tank body. The floating roof floats along with the falling or rising of the water level of the water tank, the liquid level coverage rate of the floating roof sealing method is high, and the air isolation effect is good. A plurality of floating blocks 13 are fixed under the single-layer film 12, so that the film floats on the water surface. The utility model does not exclude the form of adopting multilayer film.

In a preferred embodiment, the single-layer film 12 is made of an organic polymer material with high water vapor permeation resistance, low density, corrosion resistance, air impermeability, good ductility and good resilience.

As shown in fig. 1 and 2, in order to prevent the water inlet pipe 2 and the overflow pipe 7 in the demineralized water tank from influencing the up-and-down movement of the flexible floating roof 6, the water inlet pipe 2 is modified into a 90-degree downward bending type from a gooseneck-shaped water inlet pipe and is arranged below the flexible floating roof 6, and the flexible floating roof is arranged above the water inlet pipe before water enters; and the overflow pipe 7 is modified from being arranged inside the water tank to be arranged on the outer wall of the water tank, and the water of the overflow pipe is discharged to a sewage system of the nuclear power station.

The water outlet pipe 4 is connected with a water pump water suction pipe of the demineralized water distribution system and used for supplying water to a demineralized water user, the water outlet pipe 4 is provided with a metal hose, the flexibility of the hose can absorb thermal expansion and prevent vibration impact caused by different axial bending, vibration transmission is effectively prevented, and a damping measure is added for the water tank. And the water outlet pipe 4 of the water tank is provided with a sampling pipe 9 for periodically sampling and detecting whether the water quality parameters of the desalted water in the water tank meet the process requirements.

The circulation return pipe 8 is a return pipe of a water pump of a demineralized water distribution system, and because the fluctuation of the water consumption of a downstream user is large, the efficiency of the water pump is very low when the water pump operates under a low-flow condition, even a vaporization phenomenon is generated, the safe operation of the water pump is influenced, and therefore the circulation return pipe is provided with a small-flow return pipe to protect the water pump. The circulating water return pipe 8 can also play a role in periodically circulating the desalted water, and the pollution to the water quality caused by long-term standing is reduced.

In order to prevent the desalting water tank from being over-pressurized, the top of the water tank is provided with a vent hole 5, and carbon dioxide in the air can enter the water tank through the vent hole and generate dissolution ionization reaction with water to cause water quality pollution.

And the bottom of the box body 1 of the demineralized water tank is provided with a vent pipe 3 for venting water in the water tank during maintenance. The emergency water taking interface 15 is additionally arranged on the emptying pipe 3, when the earthquake superposition plant is in a power-off working condition, if the demineralized water tank is available, the fire hose can be temporarily connected, and water is supplied to an important safety system through power equipment such as a fire truck or a hand pump, so that the harm caused by the extreme accident working condition is relieved, and a water source heat sink is provided for safe shutdown.

The ultrasonic liquid level meter 10 is arranged outside the water tank, is a non-contact water level measuring signal, and is used for controlling the opening and closing of a water replenishing valve of the water tank and feeding back the liquid level of the water tank to a control room in time. In order to ensure that the floating roof of the water tank moves up and down smoothly, the water replenishing liquid level control of the water tank is changed from an internal liquid level switch to an external ultrasonic liquid level meter 10.

The position of the bottom of the water tank, which is close to the water inlet pipe 2, and the top of the water tank are respectively provided with a manhole 11 with the diameter of 700mm, the manhole at the bottom is used for overhauling the water tank and the water inlet pipe, and the manhole at the top is used for sampling and detecting the quality of the desalted water.

The advantage of this embodiment lies in, the demineralized water distribution system is one of the important auxiliary system of nuclear power plant, provides reliable demineralized water for whole factory security level and non-security level system, because the low reaches user is more, and the fluctuation of water consumption is great, so set up the demineralized water case and not only play the regulating effect, still be used for storing the play water of demineralized water production line. The water tank is provided with accessories such as a water inlet pipe, a water outlet pipe, a circulating water return pipe, an overflow pipe, a vent pipe, an emptying pipe, a liquid level meter and the like, and after a flexible floating roof sealing measure is added, gas-liquid phases can be isolated, so that pollutants such as carbon dioxide, dust and the like in the air are prevented from entering the water tank, and water pollution is avoided. The flexible floating roof of individual layer mode that this scheme adopted is a whole that comprises individual layer membrane body, and membranous material is one kind and resists that vapour permeability is strong, density is little, corrosion resistance is strong, airtight, ductility is good, the organic macromolecular material that the resilience is good, has that coverage efficiency is high, simple to operate, non-maintaining, long service life, to characteristics such as equipment shape and structural suitability are strong, low price. For guaranteeing that flexible floating roof reciprocates along with the water tank water level, carried out corresponding optimization to inlet tube, overflow pipe and level gauge, modified into 90 kickdown formulas from gooseneck shape inlet tube with the inlet tube, and set up in the below of flexible floating roof, modified the overflow pipe for installing at the water tank outer wall from installing inside the water tank, modified level switch into ultrasonic wave level gauge, can carry out real-time supervision to the water tank water level with water contactless. Meanwhile, an emergency water taking interface is additionally arranged on the water tank emptying pipe, emergency water supplement can be performed on a safety level system through a connecting hose and a fire engine under an extreme working condition, and the requirement of third-generation nuclear power safety economy is met.

It is obvious to a person skilled in the art that the structure of the invention is not restricted to details of the above-described exemplary embodiments, but that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments may be combined as appropriate by one of ordinary skill in the art to form other embodiments as will be apparent to those of skill in the art from the description herein.

Claims

1. The utility model provides a take seal structure's demineralized water tank of nuclear power plant, is including box (1) that is used for storing demineralized water, box (1) is connected with demineralized water production line and demineralized water distribution system, its characterized in that is equipped with flexible floating roof (6) above the water level in box (1), flexible floating roof (6) outer fringe and box (1) inner wall sliding contact and sealed, and flexible floating roof (6) float along with the decline or the rising of the interior water level of box, realize the double-phase isolated of gas-liquid in the box.

2. The nuclear power plant demineralized water tank with sealed structure according to claim 1, characterized in that the main body cover of the flexible floating roof (6) is a membrane (12) with enough strength and air tightness, a plurality of floating blocks (13) are arranged below the membrane (12) to enable the membrane (12) to float on the water surface, the outer edge of the membrane (12) is fixed through a rigid ring, the periphery of the ring is provided with a rubber ring (14), and the rubber ring (14) is in sliding contact with and sealed with the inner wall of the cylindrical tank body (1).

3. The nuclear power plant demineralized water tank with sealed structure according to claim 2 characterized in that said membrane (12) is a single layer membrane of organic polymer material.

4. The nuclear power plant demineralized water tank with the sealing structure is characterized in that the water inlet pipe (2) of the tank body (1) is of a 90-degree downward-bending structure and is arranged below the flexible floating roof (6), an overflow pipe (7) is arranged at the upper part of the outer wall of the tank body (1), and the overflow pipe (7) is connected with a sewage system of a nuclear power plant.

5. The nuclear power plant demineralized water tank with sealed structure according to claim 1, characterized in that the outlet pipe (4) of the tank body (1) is connected with the water suction pipe of the demineralized water distribution system for supplying water to the demineralized water user, and a metal hose is installed on the outlet pipe (4), and the metal hose can absorb thermal expansion and prevent vibration impact and vibration transmission; the water outlet pipe (4) is also provided with a sampling pipe (9).

6. The nuclear power plant demineralized water tank with sealed structure according to claim 1 characterized in that said tank body (1) is provided at its lower portion with a circulation return pipe (8) as a return pipe of a demineralized water distribution system water pump.

7. The nuclear power plant demineralized water tank with sealed structure according to claim 1 characterized in that the top of said tank body (1) is provided with a vent (5) for preventing overpressure of the tank.

8. The nuclear power plant demineralized water tank with sealed structure according to claim 4, characterized in that manholes (11) are respectively arranged at the bottom of the tank body (1) close to the water inlet pipe (2) and at the top of the tank body, the manholes at the bottom are used for overhauling the water tank and the water inlet pipe, and the manholes at the top are used for sampling and detecting the demineralized water quality.

9. The nuclear power plant demineralized water tank with the sealing structure is characterized in that the bottom of the tank body (1) is provided with a vent pipe (3) for venting water in the tank during maintenance, and the vent pipe (3) is provided with an emergency water taking connector (15).

10. The nuclear power plant demineralized water tank with the sealing structure is characterized in that an ultrasonic liquid level meter (10) is arranged on the outer side of the tank body (1) and used for controlling the opening and closing of a water replenishing valve of the water tank and feeding back the liquid level of the water tank to a control room in time.