WO2022057927A1

WO2022057927A1 - Combustible gas control method and system

Info

Publication number: WO2022057927A1
Application number: PCT/CN2021/119372
Authority: WO
Inventors: 陈美兰; 陈鹏; 徐伟峰; 徐德阳; 李亚冰; 贺东钰; 刘梦影
Original assignee: 中广核研究院有限公司; 中广核工程有限公司; 中国广核集团有限公司; 中国广核电力股份有限公司
Priority date: 2020-09-21
Filing date: 2021-09-18
Publication date: 2022-03-24
Also published as: CN112151198A

Abstract

A combustible gas control system, comprising a plurality of safety-level passive hydrogen recombiners provided in designated positions within a containment, each hydrogen recombiner being used to automatically start and continuously eliminate hydrogen by means of a hydrogen-oxygen recombination reaction when the hydrogen concentration within the containment exceeds a preset start threshold in design expansion conditions and severe accident conditions without significant damage being caused to a reactor core, and to automatically stop hydrogen elimination until the hydrogen concentration within the containment is lower than a preset stop threshold. In design expansion conditions and severe accident conditions of nuclear power plants without significant damage being caused to a reactor core, combustible gas may be completely passively reduced, avoiding combustible gas explosion, and further improving the safety of nuclear power plants.

Description

A combustible gas control method and system

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number 202010992586.X and the invention titled "A Combustible Gas Control Method and System" filed with the China Patent Office on September 21, 2020, the entire contents of which are incorporated by reference in in this application.

technical field

The present disclosure relates to the technical field of nuclear power reactor technology safety, and in particular, to a combustible gas control method and system.

Background technique

Nuclear power safety work needs to consider not only the countermeasures for design basis accident conditions and severe accident conditions, but also the countermeasures for design expansion accident conditions that do not cause obvious damage to the core, mainly because the above-mentioned accident conditions may produce and A large amount of hydrogen is released. Therefore, the containment hydrogen elimination measures must be considered in the nuclear power safety work.

Considering that hydrogen has the characteristics of low relative density and rapid rise and diffusion in the atmosphere, and the distribution of hydrogen is affected by forced convection during a short mixing time and natural convection during a long mixing time, the distribution of the gas mainly depends on hydrogen. , the location of the steam release, the release rate. Therefore, the location of the hydrogen source within the containment has a great influence on the distribution of hydrogen.

At present, there are various measures to eliminate hydrogen from the containment of nuclear power plants, but they all have shortcomings. For example, a common method can control the hydrogen content in the containment within a safe range in the case of design basis accidents and severe accidents through active hydrogen elimination to avoid hydrogen detonation accidents, but only for design basis accidents and core accidents. The serious accident of melting is not applicable to the design expansion condition that is more serious than the design basis accident and does not cause obvious damage to the core, and the automatic hydrogen-oxygen recombination subsystem in the invention patent prepares the hydrogen-oxygen recombination according to the ignition signal, Not completely passive and unavailable in the event of ignition signal failure.

Therefore, there is an urgent need for a containment hydrogen elimination measure, which can completely passively eliminate hydrogen in the design expansion conditions and severe accident conditions of the nuclear power plant without causing obvious damage to the core, avoid hydrogen explosion, and further improve the Safety of nuclear power plants.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present disclosure is to provide a combustible gas control method and system, which can completely passively reduce combustible gas under the design expansion conditions and severe accident conditions in which the nuclear power plant does not cause obvious damage to the core. , avoid combustible gas explosion, and further improve the safety of nuclear power plants.

In order to solve the above-mentioned technical problems, the embodiments of the present disclosure provide a combustible gas control system, including: a plurality of safety-grade passive hydrogen recombiners disposed at designated positions in the containment vessel; wherein,

Each hydrogen recombiner is used for design expansion conditions and severe accident conditions that do not cause significant damage to the core. When the hydrogen concentration in the containment exceeds the preset start-up threshold, it will automatically start and pass hydrogen-oxygen recombination. The reaction continues to eliminate hydrogen until the hydrogen concentration in the containment is lower than the preset stop threshold, and the hydrogen elimination is automatically stopped.

Among them, it also includes: a plurality of hydrogen sensors; wherein, each hydrogen sensor is used to automatically monitor the hydrogen concentration in the containment after entering a serious accident condition, and further transmit the measured hydrogen concentration to the main control room real-time display.

Among them, there are 29 safety-level passive hydrogen recombiners, including 27 safety-level 3 passive hydrogen recombiners and 2 safety-level 2 passive hydrogen recombiners; Designated locations include 3 steam generator rooms, 3 main pump rooms, 1 pressure regulator room, 1 surge tube room, 2 annular spaces, and the containment dome space within the containment;

Wherein, in each of the three steam generator rooms, four passive hydrogen recombiners with safety level 3 are correspondingly arranged in each steam generator room;

In each of the three main pump rooms, a passive hydrogen recombiner with safety level 3 is correspondingly arranged;

Three safety-level 3 passive hydrogen recombiners are arranged in the pressure regulator room;

A passive hydrogen recombiner with safety level 3 is arranged in the wave tube room;

In each of the two annular spaces, two passive hydrogen recombiners of safety level 3 are correspondingly arranged in each containment annular space; and

Four passive hydrogen recombiners of safety level 3 and two passive hydrogen recombiners of safety level 2 are arranged in the dome space of the containment.

Wherein, the 4 safety-level 3 passive hydrogen recombiners arranged in each steam generator room are 2 large passive hydrogen recombiners and 2 small passive hydrogen recombiners;

Two of the three main pump rooms are equipped with a safety-level 3 passive hydrogen recombiner, which are small passive hydrogen recombiners, and a safety-level 3 passive hydrogen recombiner is arranged in the other. The recombiner is a large passive hydrogen recombiner;

The three safety-level 3 passive hydrogen recombiners arranged in the pressure regulator room are one large passive hydrogen recombiner and two small passive hydrogen recombiners;

One safety-level 3 passive hydrogen recombiner arranged in the wave tube room is a small passive hydrogen recombiner;

The two safety-level 3 passive hydrogen recombiners arranged in the annular space of each containment are two large passive hydrogen recombiners;

The four safety-level 3 passive hydrogen recombiners and the two safety-level 2 passive hydrogen recombiners arranged in the dome space of the containment vessel are large passive hydrogen recombiners.

Among them, there are 5 hydrogen sensors; among them,

A hydrogen sensor is correspondingly arranged on the top platform of each steam generator room in the three steam generator rooms;

A hydrogen sensor is arranged at the top of one of the two annular spaces; and

A hydrogen sensor is arranged on the containment dome in the containment dome space.

Embodiments of the present disclosure also provide a combustible gas control method, which is implemented on the aforementioned combustible gas control system, and includes the following steps:

The hydrogen recombiner obtains the hydrogen concentration under the design expansion conditions and severe accident conditions without causing significant damage to the core;

If the obtained hydrogen concentration exceeds the preset start threshold, it will automatically start and continue to eliminate hydrogen through the hydrogen-oxygen composite reaction until the hydrogen concentration in the containment under the current accident condition is lower than the preset stop threshold. Stop eliminating hydrogen.

Wherein, the method further includes:

After entering a serious accident condition, the sensor is turned on to automatically monitor the hydrogen concentration in the containment, and further transmit the measured hydrogen concentration to the main control room for real-time display.

Wherein, the design extension working condition includes the working condition DEC-A which does not cause obvious damage to the core and the severe accident condition DEC-B.

Implementing the embodiments of the present disclosure has the following beneficial effects:

1. The present disclosure completely passively reduces hydrogen through multiple safety-grade passive hydrogen recombiners under the design expansion conditions and severe accident conditions that do not cause obvious damage to the core, and realizes the "full operating conditions" of the nuclear power plant. , "completely passive" hydrogen control problem, which can deal with both design basis accidents and design expansion conditions (DEC-A and DEC-B);

2. The present disclosure realizes the integration and unification of "hydrogen elimination" and "hydrogen measurement" through the passive hydrogen recombiner and hydrogen sensor, so that the passive hydrogen recombiner can effectively utilize the "chimney effect" of the hydrogen recombiner to promote natural circulation , not only improves the efficiency of hydrogen elimination, but also avoids the risk of hydrogen explosion caused by the accumulation of hydrogen on the dome due to buoyancy (hydrogen recombiner at the dome position), further improving the safety of the nuclear power plant, and at the same time making the hydrogen sensor enter a serious accident. After startup, the measured hydrogen concentration is displayed in the main control room in real time, which can be used as a guideline for serious accident management actions.

Description of drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belong to the scope of the present disclosure without any creative effort.

FIG. 1 is an application diagram of a combustible gas control system provided by an embodiment of the present disclosure;

FIG. 2 is an effect diagram of utilizing a passive hydrogen recombiner to realize the chimney effect and enhancing the natural circulation in the containment in a combustible gas control system provided by an embodiment of the present disclosure;

FIG. 3 is a flowchart of a combustible gas control method according to an embodiment of the present disclosure.

detailed description

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , in an embodiment of the present disclosure, a combustible gas control system is provided, including: a hydrogen recombiner and a hydrogen sensor; the hydrogen recombiner is arranged in the containment; the hydrogen sensor is configured to Monitor the hydrogen concentration in the hydrogen recombiner; when the hydrogen concentration monitored by the hydrogen sensor exceeds the preset starting threshold of the hydrogen recombiner, the hydrogen-oxygen recombination reaction is used to carry out hydrogen elimination treatment until the hydrogen concentration in the containment is lower than Stop threshold for the hydrogen recombiner.

In one embodiment, the hydrogen recombiner may be a safety grade passive hydrogen recombiner.

In one embodiment, the containment vessel may have multiple designated locations; at least one hydrogen recombiner may be disposed at the designated location. The designated location may include at least one of a steam generator room, a main pump room, a pressurizer room, a surge tube room, an annular space, and a containment dome space. There are multiple steam generator rooms; multiple main pump rooms; at least two annular spaces; each steam generator room is correspondingly arranged with a plurality of hydrogen recombiners; each main pump room is correspondingly arranged with at least two One hydrogen recombiner; a plurality of hydrogen recombiners are arranged in the pressure regulator room; at least one hydrogen recombiner is arranged in the wave tube room; at least two hydrogen recombiners are arranged in each annular space; the containment dome space A plurality of hydrogen recombiners are arranged inside.

In order to facilitate the in-depth understanding of the embodiments of the present disclosure by those skilled in the art, please refer to the specific example of the deployment of the hydrogen recombiner in each designated position in the containment shown in FIG. 1 . There are 29 multiple safety-grade passive hydrogen recombiners installed at designated positions in the containment vessel. The designated locations in the containment include 3 steam generator rooms (numbered 7 to 9 as shown in Figure 1), 3 main pump rooms (numbered 4 to 6 as shown in Figure 1) in the containment , 1 voltage regulator room (numbered 10 as shown in Figure 1), 1 surge tube room (numbered 12 as shown in Figure 1), 2 annular spaces (as shown in Figure 1 ) two numerals 16), and a containment dome space (as shown in Figure 1, numeral 17). in:

Four hydrogen recombiners are arranged in each of the three steam generator rooms correspondingly.

One hydrogen recombiner is arranged in each of the three main pump rooms;

There are 3 hydrogen recombiners arranged in the regulator room;

A hydrogen recombiner is arranged in the wave tube room;

In each of the two annular spaces, two hydrogen recombiners are correspondingly arranged in each containment annular space;

There are 6 hydrogen recombiners arranged in the dome space of the containment.

Each hydrogen recombiner can be used in design expansion conditions and severe accident conditions that do not cause significant damage to the core, when the hydrogen concentration in the containment exceeds the preset hydrogen recombiner activation threshold (eg 2vol%) , it will automatically start and continue to eliminate hydrogen through the hydrogen-oxygen recombination reaction, until the hydrogen concentration in the containment is lower than the preset stop threshold (eg 0.5vol%) of the hydrogen recombiner, then automatically stop the hydrogen elimination.

In the embodiment of the present disclosure, the combustible gas control system further includes: a plurality of hydrogen sensors (character △ as shown in FIG. 1 ).

In one embodiment, at least one hydrogen sensor is arranged at at least one designated location. More specifically, at least one hydrogen sensor is disposed on at least one of the steam generator room, the annular space, and the containment dome space.

In one embodiment, there are multiple steam generator rooms; there are at least two annular spaces; at least one hydrogen sensor is correspondingly arranged on the top platform of each steam generator room; the top of at least one annular space is arranged with at least one hydrogen sensor; the containment dome in the containment dome space is arranged with at least one hydrogen sensor.

In order to facilitate the in-depth understanding of the embodiments of the present disclosure by those skilled in the art, please refer to the specific example of the deployment of the hydrogen recombiner shown in FIG. 1 . Five hydrogen sensors can be arranged in the containment; one hydrogen sensor is correspondingly arranged on the top platform of each steam generator room in the three steam generator rooms (as shown in Figure 1 outside the numerals 7 to 9) The character △ at the top); a hydrogen sensor is arranged at the top of one of the two annular spaces (as shown in Figure 1, the character △ at the top outside the right number sign 16); and the safety in the dome space of the containment The dome of the shell is arranged with 1 hydrogen sensor (the character △ at the top of the numeral 17 as shown in FIG. 1 ).

Among them, each hydrogen sensor can be used to automatically monitor the hydrogen concentration in the containment after entering a serious accident condition, and further transmit the measured hydrogen concentration to the main control room for real-time display, which can be used for the guidance of serious accident management actions in accordance with.

In one embodiment, the hydrogen recombiner may have corresponding safety levels, including a first safety level and a second safety level; the steam generator room, the main pump room, the pressure regulator room, the surge tube room, and the annular space. The arranged hydrogen server is a hydrogen recombiner of the second safety level; the plurality of hydrogen recombiners arranged in the dome space of the containment at least includes N hydrogen recombiners of the second safety level and M hydrogen recombiners of the first safety level; Among them, N>M; the nuclear safety design requirements of the first safety level are higher than those of the second safety level.

Specifically, the safety level may be a level related to nuclear safety design requirements. The higher the level, the higher the design requirements for nuclear safety. For example, the first safety level can be specifically the safety level 2, and the second safety level can be specifically the safety level 3. The nuclear safety design requirements corresponding to the safety level 2 are higher than the safety level. Level 3.

It should be noted that the higher the safety level of the hydrogen recombiner, the higher the cost. Therefore, in the above-mentioned combustible gas control system, the hydrogen recombiner of the second safety level is arranged in the steam generator room, the main pump room, the pressure regulator room, the wave tube room and the annular space, while the hydrogen recombiner of the second safety level is arranged in the containment dome space. Arranging more hydrogen recombiners of the second safety level and relatively few hydrogen recombiners of the first safety level reduces the configuration cost of the hydrogen recombiners on the premise of meeting the safety design requirements.

In one embodiment, the hydrogen recombiner includes a large hydrogen recombiner and a small hydrogen recombiner; a large hydrogen recombiner and a small hydrogen recombiner are arranged in each steam generator room; a small hydrogen recombiner is arranged in some main pump rooms A hydrogen recombiner, and a large hydrogen recombiner is arranged in another part of the main pump room; at least one large hydrogen recombiner and at least two small hydrogen recombiners are arranged in the regulator room; small hydrogen recombiners are arranged in the wave tube room ; A large hydrogen recombiner is arranged in each annular space; a large hydrogen recombiner is arranged in the dome space of the containment.

Specifically, compared with small hydrogen recombiners, large-scale hydrogen recombiners have larger equipment size and higher power, and correspondingly, the hydrogen elimination rate is also larger. In practical applications, in different designated positions in the containment, the available space for arranging the hydrogen recombiner is different, and the requirements for the hydrogen elimination rate are also different. Therefore, in the above-mentioned combustible gas control system, a certain number of large hydrogen recombiners and small hydrogen recombiners are correspondingly arranged according to the size of the available space for the arrangement of hydrogen recombiners at each designated location and the demand for the rate of hydrogen elimination, so as to fully The controls at the specified location meet the hydrogen elimination requirements at the specified location.

In order to facilitate the in-depth understanding of the embodiments of the present disclosure by those skilled in the art, please refer to the specific example of the deployment of the hydrogen recombiner shown in FIG. 1 . There are 29 hydrogen recombiners installed at designated positions in the containment vessel, including 27 passive hydrogen recombiners with

safety level

3 and 2 passive hydrogen recombiners with safety level 2. in:

The 4 safety-level 3 hydrogen recombiners arranged in each steam generator room are 2 large hydrogen recombiners (as shown in Figure 1, the characters in the numerals 7-9) and 2 small hydrogen recombiners (As shown in Figure 1, the characters ○ in the numbers 7 to 9);

Two of the three main pump rooms are equipped with a safety-level 3 hydrogen recombiner, both of which are small hydrogen recombiners (characters ○ in numerals 4 and 6 as shown in Figure 1), and the other A hydrogen recombiner with safety level 3 is a large hydrogen recombiner (as shown in Figure 1, the character ● in the number 5);

There are 3 hydrogen recombiners with safety level 3 arranged in the regulator room, and there are 1 large hydrogen recombiner (as shown in Figure 1, the character in the numeral 10) and 2 small hydrogen recombiners (as shown in the figure). The character ○ in the numeral label 10 shown in 1);

A hydrogen recombiner with safety level 3 is arranged in the wave tube room, and it is a small hydrogen recombiner (as shown in Figure 1, the character ○ in the numeral 12);

In each of the two annular spaces, there are two safety-level 3 hydrogen recombiners arranged in each containment annular space, and the two safety-level 3 hydrogen recombiners arranged in each containment annular space are large-scale hydrogen recombiners. device (as shown in Figure 1, the character ● in the two numeral labels 16);

There are 4 hydrogen recombiners with

safety level

3 and 2 hydrogen recombiners with safety level 2 arranged in the dome space of the containment vessel, and the 4 hydrogen recombiners with safety level 3 are large hydrogen recombiners (as shown in Figure 1). The character ● in the mark 17), the two hydrogen recombiners with the safety level 2 are also large-scale hydrogen recombiners (the characters in the two marks 17 as shown in Figure 1).

It should be noted that, in Fig. 1, the numeral 1 is the heap pit, the numeral 2 is the inner displacement water tank, the numeral 3 is the lower compartment of the containment, the numeral 11 is the pressure relief box compartment, and the numeral 13 is the compartment of the pressure relief box. For the reactor water pool, the numeral 14 is the component pool, and the numeral 15 is the reactor pit injection pool.

The working principle of a combustible gas control system in the embodiment of the present disclosure is as follows: first, the steam generator room, the main pump room, the pressure regulator room, the wave tube room, the containment annular space, and the dome space in the containment space share a total of Arrange 29 passive hydrogen recombiners, including 18 large hydrogen recombiners and 11 small hydrogen recombiners; secondly, a hydrogen sensor is arranged on each of the top platforms of the three steam generators, and arranged in the annular space 1 hydrogen sensor, and 1 hydrogen sensor is arranged on the dome; then, in the design expansion conditions and severe accident conditions that do not cause obvious damage to the core, when the hydrogen concentration in the containment exceeds the starting threshold of the hydrogen recombiner (such as 2vol%), the hydrogen recombiner starts automatically, eliminates hydrogen through the hydrogen-oxygen recombination reaction, releases heat at the same time, heats the gas at the outlet of the hydrogen recombiner, and forms the “chimney effect” of the buoyancy-driven flow phenomenon in the hydrogen recombiner (as shown in Figure 2). display), promote natural circulation, enhance the mixing of the containment atmosphere while improving the efficiency of hydrogen elimination, further reduce the risk of hydrogen explosion and improve the safety of nuclear power plants; finally, after entering serious accident conditions, turn on the hydrogen sensor to implement safety The hydrogen concentration in the shell is monitored, and the measured hydrogen concentration is displayed in the main control room in real time, which is used as a guiding basis for serious accident management actions.

It can be understood that, in the process of the present disclosure, an iterative optimization method for combustible gas control design and solution demonstration can also be established. Using three-dimensional computational fluid dynamics method, the flow field in the containment and the composite reaction physical and chemical process of the hydrogen recombiner are accurately simulated, and the layout plan is continuously optimized, and it is verified that the design plan of the combustible gas control system can effectively reduce hydrogen. Reasonably, the "chimney effect" of the hydrogen recombiner promotes the natural circulation in the containment and improves the hydrogen elimination efficiency.

As shown in FIG. 3 , in the embodiment of the present disclosure, a combustible gas control method is provided, which is implemented on the aforementioned combustible gas control system, and includes the following steps:

Step S31, the hydrogen recombiner obtains the hydrogen concentration under the design expansion condition and the severe accident condition that do not cause obvious damage to the core;

Step S32, if the obtained hydrogen concentration exceeds the preset start threshold, start automatically and continue to eliminate hydrogen through the hydrogen-oxygen composite reaction, until the hydrogen concentration in the containment under the current accident condition is lower than the preset stop. Automatically stop hydrogen elimination when the threshold is reached.

Wherein, the method further includes:

Wherein, the design extension working condition includes the working condition DEC-A which does not cause obvious damage to the core, and the core melting working condition DEC-B.

As shown in FIG. 4 , another combustible gas control method provided in the embodiment of the present disclosure, which is implemented on the aforementioned combustible gas control system, includes the following steps:

Step S41, the hydrogen sensor monitors the hydrogen concentration in the containment;

Step S42, when the hydrogen concentration monitored by the hydrogen sensor exceeds the preset starting threshold of the hydrogen recombiner, perform hydrogen elimination treatment through the hydrogen-oxygen recombination reaction until the hydrogen concentration in the containment is lower than the preset stopping threshold of the hydrogen recombiner .

Since the combustible gas control method has been described in detail in the above embodiments of the combustible gas control system, it will not be repeated here.

2. The present disclosure realizes the integration and unification of "hydrogen elimination" and "hydrogen measurement" through the passive hydrogen recombiner and hydrogen sensor, so that the passive hydrogen recombiner can effectively utilize the "chimney effect" of the hydrogen recombiner to promote natural circulation , not only improves the efficiency of hydrogen elimination, but also avoids the risk of hydrogen explosion caused by the accumulation of hydrogen in the dome due to buoyancy (the hydrogen recombiner at the dome position), further improving the safety of the nuclear power plant, and at the same time making the hydrogen sensor enter a serious accident. After startup, the measured hydrogen concentration is displayed in the main control room in real time, which can be used as a guideline for serious accident management actions.

Those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media such as ROM/RAM, magnetic disk, optical disk, etc.

What is disclosed above is only the preferred embodiments of the present disclosure, and of course, it cannot limit the scope of the rights of the present disclosure. Therefore, equivalent changes made according to the claims of the present disclosure are still within the scope of the present disclosure.

Claims

A combustible gas control system, characterized in that it comprises: a plurality of safety-grade passive hydrogen recombiners arranged at designated positions in a containment; wherein,

Each hydrogen recombiner is used for design expansion conditions and severe accident conditions that do not cause significant damage to the core. When the hydrogen concentration in the containment exceeds the preset start-up threshold, it will automatically start and pass hydrogen-oxygen recombination. The reaction continues to eliminate hydrogen until the hydrogen concentration in the containment is lower than the preset stop threshold, and the hydrogen elimination is automatically stopped.
The combustible gas control system according to claim 1, further comprising: a plurality of hydrogen sensors; wherein each hydrogen sensor is used to automatically monitor the hydrogen concentration in the containment after entering a serious accident condition , and further transmit the measured hydrogen concentration to the main control room for real-time display.
The combustible gas control system according to claim 2, wherein there are 29 safety-level passive hydrogen recombiners, including 27 safety-level 3 passive hydrogen recombiners and 2 safety-level 2 passive hydrogen recombiners. Class 1 passive hydrogen recombiner; the designated location in the containment includes 3 steam generator rooms, 3 main pump rooms, 1 pressure regulator room, 1 surge tube room, 2 annular rooms in the containment space, and containment dome space;

Wherein, in each of the three steam generator rooms, four passive hydrogen recombiners with safety level 3 are correspondingly arranged in each steam generator room;

In each of the three main pump rooms, a passive hydrogen recombiner with safety level 3 is correspondingly arranged;

Three safety-level 3 passive hydrogen recombiners are arranged in the pressure regulator room;

A passive hydrogen recombiner with safety level 3 is arranged in the wave tube room;

In each of the two annular spaces, two passive hydrogen recombiners of safety level 3 are correspondingly arranged in each containment annular space; and

Four passive hydrogen recombiners of safety level 3 and two passive hydrogen recombiners of safety level 2 are arranged in the dome space of the containment.
The combustible gas control system according to claim 3, wherein the four safety-level 3 passive hydrogen recombiners arranged in each steam generator room are all two large-scale passive hydrogen recombiners and 2 small passive hydrogen recombiners;

Two of the three main pump rooms are equipped with a safety-level 3 passive hydrogen recombiner, which are small passive hydrogen recombiners, and a safety-level 3 passive hydrogen recombiner is arranged in the other. The recombiner is a large passive hydrogen recombiner;

The three safety-level 3 passive hydrogen recombiners arranged in the pressure regulator room are one large passive hydrogen recombiner and two small passive hydrogen recombiners;

One safety-level 3 passive hydrogen recombiner arranged in the wave tube room is a small passive hydrogen recombiner;

The two safety-level 3 passive hydrogen recombiners arranged in the annular space of each containment are two large passive hydrogen recombiners;

The four safety-level 3 passive hydrogen recombiners and the two safety-level 2 passive hydrogen recombiners arranged in the dome space of the containment vessel are large passive hydrogen recombiners.
The combustible gas control system according to claim 4, wherein there are five hydrogen sensors; wherein,

A hydrogen sensor is correspondingly arranged on the top platform of each steam generator room in the three steam generator rooms;

A hydrogen sensor is arranged at the top of one of the two annular spaces; and

A hydrogen sensor is arranged on the containment dome in the containment dome space.
A combustible gas control method, characterized in that it is implemented on the combustible gas control system as claimed in claim 1, comprising the following steps:

The hydrogen recombiner obtains the hydrogen concentration under the design expansion conditions and severe accident conditions without causing significant damage to the core;

If the obtained hydrogen concentration exceeds the preset start threshold, it will automatically start and continue to eliminate hydrogen through the hydrogen-oxygen composite reaction until the hydrogen concentration in the containment under the current accident condition is lower than the preset stop threshold. Stop eliminating hydrogen.
The combustible gas control method according to claim 6, wherein the method further comprises:

After entering a serious accident condition, the hydrogen sensor is turned on and automatically monitors the hydrogen concentration in the containment, and further transmits the measured hydrogen concentration to the main control room for real-time display.
A combustible gas control system, characterized in that it comprises a hydrogen recombiner and a hydrogen sensor; the hydrogen recombiner is arranged in a containment;

the hydrogen sensor, configured to monitor the hydrogen concentration in the containment;

The hydrogen recombiner, when the hydrogen concentration monitored by the hydrogen sensor exceeds the preset starting threshold of the hydrogen recombiner, performs hydrogen elimination treatment through a hydrogen-oxygen recombination reaction, until the hydrogen in the containment vessel is dehydrated. The concentration is below the stop threshold of the hydrogen recombiner.
The combustible gas control system of claim 8, wherein the containment vessel has a plurality of designated locations; at least one of the hydrogen recombiners is arranged on the designated locations; the designated locations include a steam generator room , at least one of the main pump room, the regulator room, the surge tube room, the annular space, and the containment dome space.
The combustible gas control system of claim 9, wherein the steam generator room has a plurality; the main pump room has a plurality; the annular space has at least two;

A plurality of the hydrogen recombiners are correspondingly arranged in each of the steam generator rooms;

At least one of the hydrogen recombiners is correspondingly arranged in each of the main pump rooms;

A plurality of the hydrogen recombiners are arranged in the pressurizer room;

At least one of the hydrogen recombiners is arranged in the wave tube room;

At least two of the hydrogen recombiners are correspondingly arranged in each of the annular spaces;

A plurality of the hydrogen recombiners are arranged in the containment dome space.
The combustible gas control system according to claim 9, wherein the hydrogen recombiner has a corresponding safety level, and the safety level includes a first safety level and a second safety level;

The steam generator room, the main pump room, the pressure regulator room, the wave tube room and the hydrogen server arranged in the annular space are hydrogen recombiners of the second safety level;

The plurality of hydrogen recombiners arranged in the dome space of the containment vessel include at least N hydrogen recombiners of the second safety level and M hydrogen recombiners of the first safety level; wherein, N>M.
The combustible gas control system according to claim 9, wherein the hydrogen recombiner comprises a large hydrogen recombiner and a small hydrogen recombiner;

The large hydrogen recombiner and the small hydrogen recombiner are arranged in each of the steam generator rooms;

The small hydrogen recombiner is arranged in part of the main pump room, and the large hydrogen recombiner is arranged in another part of the main pump room;

At least one of the large hydrogen recombiners and at least two of the small hydrogen recombiners are arranged in the pressurizer room;

The small hydrogen recombiner is arranged in the wave tube room;

The large hydrogen recombiner is arranged in each of the annular spaces;

The large hydrogen recombiner is arranged in the dome space of the containment vessel.
The combustible gas control system of claim 9, wherein at least one of the hydrogen sensors is arranged at at least one of the designated positions.
The combustible gas control system of claim 13, wherein at least one hydrogen sensor is disposed on at least one of the steam generator room, the annular space, and the containment dome space.
The combustible gas control system of claim 13, wherein the steam generator room has a plurality; the annular space has at least two;

At least one of the hydrogen sensors is correspondingly arranged on the top platform of each of the steam generator rooms;

at least one of the hydrogen sensors is arranged at the top of at least one of the annular spaces;

The containment dome in the containment dome space is arranged with at least one of the hydrogen sensors.
A combustible gas control method, comprising:

The hydrogen sensor monitors the hydrogen concentration in the containment;

When the hydrogen concentration monitored by the hydrogen sensor exceeds the preset start-up threshold of the hydrogen recombiner, hydrogen-elimination treatment is performed through a hydrogen-oxygen recombination reaction until the hydrogen concentration in the containment vessel is lower than the preset hydrogen concentration The stop threshold for the compounder.