阅读说明：本技术 一种核电站核岛疏水排气系统的排气装置 (Exhaust device of nuclear power station nuclear island drainage exhaust system ) 是由 闵济东 杜鹏程 费冬冬 洪均 李京 石雪峰 汪跃 刘静思 王再根 罗端 安峰 于 2020-12-25 设计创作，主要内容包括：本发明属于核电厂设备检修技术领域,具体涉及一种核电站核岛疏水排气系统的排气装置,通过在核岛稳压器设备顶部排气管线上并联一套排气装置,通过在原管线上增设两个三通以及隔离阀、真空泵(真空喷射器)等装置。真空喷射器由压缩空气提供动力,与一回路的气体混合后的排气回到核岛疏水排气系统。本发明的核电站大修后一回路冲水阶段的装置,通过核岛疏水排气系统的一套排气装置,在排气管线上增设真空喷射器,通过真空喷射器将一回路气体排出,向一回路充水。真空喷射器由检修压缩空气提供动力,与一回路的气体混合后的排气回到核岛疏水排气系统。当稳压器液位达到满水时,关闭稳压器排气阀和真空喷射器的隔离阀。(The invention belongs to the technical field of nuclear power plant equipment maintenance, and particularly relates to an exhaust device of a nuclear island drainage exhaust system of a nuclear power plant. The vacuum ejector is powered by compressed air, and exhaust mixed with gas in a primary loop returns to a hydrophobic exhaust system of the nuclear island. The device for the primary loop flushing stage after the nuclear power station is overhauled is characterized in that a vacuum ejector is additionally arranged on an exhaust pipe line through a set of exhaust devices of a nuclear island drainage exhaust system, and primary loop gas is exhausted through the vacuum ejector to fill water into the primary loop. The vacuum ejector is powered by overhaul compressed air, and exhaust mixed with gas in a primary loop returns to the drainage exhaust system of the nuclear island. And when the liquid level of the pressure stabilizer reaches full water, closing an exhaust valve of the pressure stabilizer and an isolation valve of the vacuum ejector.)

1. An exhaust device of a nuclear island drainage exhaust system of a nuclear power station comprises a vacuum ejector inlet isolation valve A8, a vacuum ejector inlet isolation valve B, a vacuum ejector, an overhaul compressed air quick connector, a vacuum ejector outlet isolation valve A, a vacuum ejector outlet isolation valve B, an exhaust pipeline isolation valve, a tee joint A and a tee joint B;

the method is characterized in that:

the pressure vessel is connected with the steam generator through a main pipeline, a pipeline is branched from the main pipeline and connected with the pressure stabilizer, and the top of the pressure stabilizer is connected with a deflation isolating valve of the pressure stabilizer through a deflation valve of the pressure stabilizer and finally communicated to a drainage and exhaust system of the nuclear island.

2. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: a tee joint A is arranged between the deflation isolation valve of the voltage stabilizer and the drainage and exhaust system of the nuclear island, and then a tee joint B is arranged.

3. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: one pipeline of the tee joint A is connected with one end of the tee joint B through an exhaust pipeline isolation valve, and the other pipeline of the tee joint A is connected with a vacuum ejector and then connected with the other end of the tee joint B; and the third end of the tee joint B is connected with a nuclear island drainage exhaust system.

4. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: and a vacuum ejector inlet isolation valve A is arranged between the tee joint A and the vacuum ejector.

5. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: a vacuum ejector inlet isolation valve B is provided between the vacuum ejector inlet isolation valve a and the vacuum ejector.

6. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: and a vacuum ejector outlet isolation valve A is arranged between the vacuum ejector and the tee joint B.

7. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: and a vacuum ejector outlet isolation valve B is arranged between the vacuum ejector outlet isolation valve A and the tee joint B.

8. The exhaust device of the nuclear island hydrophobic exhaust system of the nuclear power plant as claimed in claim 1, wherein: the vacuum ejector is also connected with a maintenance compressed air quick connector.

Technical Field

The invention belongs to the technical field of nuclear power plant equipment maintenance, and particularly relates to an exhaust device of a nuclear island drainage exhaust system of a nuclear power plant.

Background

After the M310 type nuclear island main system is discharged to a low water level, when water is flushed again, due to the influence of the inverted U-shaped pipe of the steam generator and the circular top cover of the pressure container, air in the pipeline and the equipment cannot be completely discharged out of the system, and air in the main system needs to be driven in a static exhaust-dynamic exhaust-combined exhaust mode, wherein three reactor coolant pumps (hereinafter referred to as main pumps for short) need to be sequentially started in dynamic exhaust and combined exhaust.

The main pump is arranged below the main system low-pressure platform, and the auxiliary thrust pad bears the axial vertical downward load of the main pump. And the main pump of the power plant part is not designed with a top shaft oil system of the auxiliary thrust pad, so the auxiliary thrust pad bears larger load during the starting of the pump. And the vice thrust tile bearing of main pump has the design common mode problem, and the risk of motor vice thrust tile wearing and tearing is great when the low pressure platform plays the main pump, and the power plant appears the defect of the unusual wearing and tearing of vice thrust tile of main pump.

Disclosure of Invention

In view of the above disadvantages, the present invention provides an exhaust device of a nuclear island drainage exhaust system of a nuclear power plant, wherein a set of exhaust device is connected in parallel to an exhaust pipe line at the top of a nuclear island voltage stabilizer device, and two tee joints, an isolation valve, a vacuum pump (vacuum ejector), and other devices are additionally arranged on an original pipeline. The vacuum ejector is powered by compressed air, and exhaust mixed with gas in a primary loop returns to a hydrophobic exhaust system of the nuclear island.

The technical scheme of the invention is as follows:

an exhaust device of a nuclear island drainage exhaust system of a nuclear power station comprises a vacuum ejector inlet isolation valve A8, a vacuum ejector inlet isolation valve B, a vacuum ejector, an overhaul compressed air quick connector, a vacuum ejector outlet isolation valve A, a vacuum ejector outlet isolation valve B, an exhaust pipeline isolation valve, a tee joint A and a tee joint B;

the pressure vessel is connected with the steam generator through a main pipeline, a pipeline is branched from the main pipeline and connected with the pressure stabilizer, and the top of the pressure stabilizer is connected with a deflation isolating valve of the pressure stabilizer through a deflation valve of the pressure stabilizer and finally communicated to a drainage and exhaust system of the nuclear island.

A tee joint A is arranged between the deflation isolation valve of the voltage stabilizer and the drainage and exhaust system of the nuclear island, and then a tee joint B is arranged.

One pipeline of the tee joint A is connected with one end of the tee joint B through an exhaust pipeline isolation valve, and the other pipeline of the tee joint A is connected with a vacuum ejector and then connected with the other end of the tee joint B; and the third end of the tee joint B is connected with a nuclear island drainage exhaust system.

And a vacuum ejector inlet isolation valve A is arranged between the tee joint A and the vacuum ejector.

A vacuum ejector inlet isolation valve B is provided between the vacuum ejector inlet isolation valve a and the vacuum ejector.

And a vacuum ejector outlet isolation valve A is arranged between the vacuum ejector and the tee joint B.

And a vacuum ejector outlet isolation valve B is arranged between the vacuum ejector outlet isolation valve A and the tee joint B.

The vacuum ejector is also connected with a maintenance compressed air quick connector.

The invention has the beneficial effects that:

the device for the primary loop flushing stage after the nuclear power station is overhauled is characterized in that a vacuum ejector is additionally arranged on an exhaust pipe line through a set of exhaust devices of a nuclear island drainage exhaust system, and primary loop gas is exhausted through the vacuum ejector to fill water into the primary loop.

The vacuum ejector is powered by overhaul compressed air, and exhaust mixed with gas in a primary loop returns to the drainage exhaust system of the nuclear island. And when the liquid level of the pressure stabilizer reaches full water, closing an exhaust valve of the pressure stabilizer and an isolation valve of the vacuum ejector.

The invention can avoid abnormal wear and even bush burning of the main pump auxiliary bush when the main system low-pressure platform is started, reduce the starting times of the main pump on the low-pressure platform, improve the equipment reliability of the main pump, obviously save the overhaul period and improve the economic efficiency of the unit.

Drawings

Fig. 1 is a schematic diagram of the system arrangement of the present invention.

In the figure, 1-pressure vessel; 2-a voltage stabilizer; 3-a steam generator; 4-a main pipeline; 5-main pipeline half-pipe water level; 6-deflation valve of the pressure stabilizer; 7-deflation isolation valve of the pressure stabilizer; 8-vacuum ejector inlet isolation valve a; 9-vacuum ejector inlet isolation valve B; 10-vacuum ejector; 11-maintenance compressed air quick connector 12-vacuum ejector outlet isolation valve A; 13-vacuum ejector outlet isolation valve B; 14-an exhaust line isolation valve; 15-tee A; 16-tee B.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in the figure, the exhaust device of the nuclear island drainage exhaust system of the nuclear power station comprises a vacuum ejector inlet isolation valve A8, a vacuum ejector inlet isolation valve B9, a vacuum ejector 10, a maintenance compressed air quick connector 11, a vacuum ejector outlet isolation valve A12, a vacuum ejector outlet isolation valve B13, an exhaust line isolation valve 14, a tee joint A15 and a tee joint B16.

The pressure container 1 is connected with the steam generator 3 through a main pipeline 4, a pipeline branched from the main pipeline 4 is connected with a voltage stabilizer 2, the top of the voltage stabilizer is connected with a voltage stabilizer deflation isolation valve 7 through a voltage stabilizer deflation valve 6, and finally the pressure stabilizer is led to a nuclear island drainage and exhaust system;

a tee joint A15 is arranged between the deflation isolation valve 7 of the voltage stabilizer and the drainage and exhaust system of the nuclear island, and then a tee joint B16 is arranged;

one pipeline of the tee joint A15 is connected with one end of a tee joint B16 through an exhaust pipeline isolation valve 14, the other pipeline of the branch of the tee joint A15 is connected with the vacuum ejector 10 and then connected with the other end of the tee joint B16; the third end of the tee joint B16 is connected with a nuclear island hydrophobic exhaust system.

A vacuum ejector inlet isolation valve A8 is arranged between the three-way valve A15 and the vacuum ejector 10;

a vacuum ejector inlet isolation valve B9 is provided between vacuum ejector inlet isolation valve A8 and vacuum ejector 10;

a vacuum ejector outlet isolation valve A12 is arranged between the vacuum ejector 10 and the tee joint B16;

a vacuum ejector outlet isolation valve B13 is arranged between the vacuum ejector outlet isolation valve A12 and the tee joint B16;

the vacuum ejector 10 is also connected to a service air quick connector.

The device is arranged in a reactor containment vessel, on the basis of a pipeline of an original nuclear island drainage exhaust system, a nuclear island drainage exhaust pipeline at the downstream of an original pressurizer deflation isolation valve 7 is firstly cut off, a vacuum ejector 10, an inlet/outlet isolation valve 8/9/12/13 and an auxiliary pipeline are welded to a tee joint 15/16 in a mode of additionally welding two tee joints 15/16, and meanwhile, an additional exhaust pipeline isolation valve 14 is welded at the upstream of a tee joint 16 returning to the original pipeline.

The low water level overhauls the end, after the pressure vessel feeds, close the top cap and close the stabiliser manhole according to normal operation flow, a loop system has closed this moment, arrange a loop to about half a tub of water level 5, open stabiliser bleed valve 6 and stabiliser gassing isolation valve 7, open the exit isolation valve 8/9/12/13 of vacuum ejector 10, close exhaust pipe line isolation valve 14, connect maintenance pressure air and vacuum ejector 10 through quick-operation joint, start the vacuum ejector and arrange the gas of a loop to the hydrophobic exhaust system of nuclear island, after pressure drops to target pressure, open a loop water inlet valve and fill a loop with water, keep the vacuum ejector to move until stabiliser inside full water this moment, disconnection maintenance pressure air, close stabiliser bleed valve 6 and stabiliser gassing isolation valve 7.

In the process, the exhaust device of the nuclear island drainage exhaust system is additionally arranged, and the vacuum ejector is connected to the original system in parallel, so that the operation of air suction and water filling of a primary circuit is realized, the use of a main pump for dynamic exhaust and linked exhaust of the system is avoided, the possibility of abrasion of the main pump on a low-pressure platform auxiliary thrust tile is effectively avoided, and the safety of a unit is improved; meanwhile, the water filling time of a primary loop is greatly shortened, and the running economy of the unit is improved.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

In the drawings of the disclosed embodiments of the invention, only methods related to the disclosed embodiments are referred to, other methods can refer to common design, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;

the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.