Demonstration device for integrated hydrogen sampler in containment

Abstract

The invention discloses an integrated hydrogen sampler demonstration device in a containment, relates to the field of nuclear energy application demonstration and science popularization education, and solves the problem that a science popularization visualization and demonstration device for sampling hydrogen in the containment does not exist at present. The device comprises a sampler model and a supporting structure, the sampler model is installed on the supporting structure, the sampler model comprises a blowback channel, a silver zeolite section, a check valve, a throttling orifice plate and a filter plate slot, and the filter plate slot, the throttling orifice plate and the silver zeolite section are sequentially installed in the sampler model from bottom to top. The check valve is installed on the throttling orifice plate, and a back flushing channel is installed at the upper end of the check valve and penetrates through the silver zeolite section; a metal fiber filter plate is mounted on the filter plate slot; an airflow outlet is formed in the top end of the sampler model. According to the invention, the process of filtering hydrogen containing radioactive substances by the hydrogen sampling device under the accident condition of a reactor is displayed, the whole device adopts a stainless steel structure, and the filtering process and principle are visually displayed.

Description

Technical Field

[0001] The invention relates to the field of nuclear energy application demonstration and popular science education, and in particular to an integrated hydrogen sampler demonstration device in a containment vessel. Background Art

[0002] In order to ensure the safety of nuclear power plants, it is necessary to install an online hydrogen concentration monitoring system for the nuclear power plant containment. When serious accident conditions occur, sampling can be used to understand the temporal and spatial distribution patterns of hydrogen concentration, so as to formulate response measures and emergency plans in a timely and effective manner to avoid accidents.

[0003] Under severe accident conditions, a large amount of water vapor, radioactive aerosols, radioactive gaseous iodine and other mixed substances accumulate in the containment, which is a typical harsh environment with high temperature, high pressure, high humidity and strong radiation. At this time, in order to measure the hydrogen concentration in the containment by sampling, the sampled gas must be filtered first to prevent radioactive substances from escaping to the outside of the containment through the sampling pipeline, causing radiation damage to the environment and the back-end hydrogen concentration analysis equipment. Therefore, the development of a hydrogen online sampling device with high-efficiency filtration function is crucial to the entire hydrogen concentration monitoring system.

[0004] In order to effectively carry out higher-quality nuclear science popularization, it is urgent to design a set of integrated hydrogen sampling devices specifically used to demonstrate the operation of the containment under nuclear power plant accident conditions, vividly and intuitively introduce the sampling device for radioactive hydrogen under nuclear power plant accidents, and promote the development of my country's nuclear energy industry.

[0005] In CN105225587B, there is an existing popular science teaching aid and method for nuclear power plant reactor safety, which uses colored gas on the nuclear power plant model to simulate the diffusion process of radioactive substances when an accident occurs in the nuclear power plant, and intuitively and vividly displays the role of the three safety barriers of the nuclear power plant to the public. However, the invention patent only demonstrates the reactor structure and the setting of the safety barrier, and does not demonstrate the sampling and filtering process of radioactive substances in the nuclear power plant under accident conditions.

[0006] Another example is CN106205750B, a demonstration device for a passive cooling system of a nuclear power plant, including a mounting base, a control unit, and a heating unit, a cooling water tank, and a demonstration unit interconnected by a circulation pipeline. The invention content is mainly for the principle demonstration of the passive cooling system of a large advanced shell pressurized water reactor, without considering the complex environment inside the containment. Due to the complex gas environment inside the containment under accident conditions, it is not perfect to only consider its cooling, and it is still necessary to consider the removal of gas under its radioactive, high temperature and high pressure environment. Therefore, the device cannot be used for visual demonstration and popular science publicity of hydrogen sampling inside the containment. Summary of the invention

[0007] In order to solve the problem mentioned above that there is no popular science visualization and demonstration device for hydrogen sampling in the containment, the present invention proposes an integrated hydrogen sampler demonstration device in the containment. Compared with other reactor display devices, the present invention demonstrates the filtering process of hydrogen containing radioactive substances by the hydrogen sampling device in the containment under the reactor accident condition. The whole device adopts a stainless steel structure to intuitively show the filtering process and principle to the viewer.

[0008] The present invention proposes an integrated hydrogen sampler demonstration device in a containment, which specifically includes a sampler model and a supporting structure. The sampler model is installed on the supporting structure. The sampler model includes a backflush channel, a silver zeolite section, a check valve, a throttling orifice plate and a filter plate slot. The filter plate slot, the throttling orifice plate and the silver zeolite section are sequentially installed inside the sampler model from bottom to top. The check valve is installed on the throttling orifice plate. The upper end of the check valve is installed with a backflush channel, and the backflush channel runs through the silver zeolite section; a metal fiber filter plate is installed on the filter plate slot; and an airflow outlet is arranged at the top of the sampler model.

[0009] Furthermore, the silver zeolite section includes two filter screens and a plurality of silver zeolites, and the plurality of silver zeolites are arranged between the two filter screens.

[0010] Furthermore, the two filter screens are installed inside the sampler model by welding.

[0011] Furthermore, the sampler model also includes a nut, and the upper end of the backflush channel is fixed to the upper filter screen between the two via the nut.

[0012] Furthermore, the sampler model also includes two buckles, and the two buckles cooperate with the supporting structure to fix the sampler model.

[0013] Furthermore, the support structure includes a bracket and a base, and the bracket is vertically mounted on the base and cooperates with two buckles.

[0014] Furthermore, the bracket and the base are connected by welding.

[0015] Furthermore, the sampler model is a semi-cylindrical structure.

[0016] Furthermore, the top of the sampler model is a conical structure.

[0017] The beneficial effects of the integrated hydrogen sampler demonstration device in containment described in the present invention are:

[0018] (1) The integrated hydrogen sampling device in the containment described in the present invention demonstrates the filtering process of hydrogen containing radioactive substances by the hydrogen sampling device in the containment under the reactor accident condition, compared with other reactor display devices. The whole device adopts a stainless steel structure, which can intuitively show the filtering process and principle to the audience;

[0019] (2) The integrated hydrogen sampler demonstration device in the containment described in the present invention, in the test, under accident conditions, the pressure in the containment was 5Mpa, and the temperature was 200°C. Its filtering device can ensure that the filtering efficiency of radioactive aerosols, radioactive methyl iodide, radioactive iodine element, etc. reaches more than 99.99%. The throttling orifice device can achieve a gas superheat of 5 to 25°C, ensuring the normal filtering efficiency of silver zeolite; at the same time, the flow rate is maintained stable at 3 to 5L / min, ensuring the measurement accuracy of the back-end measurement equipment;

[0020] (3) The integrated hydrogen sampler demonstration device in the containment described in the present invention can be applied to popular science and teaching, promote nuclear energy and eliminate the public's fear of nuclear energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a demonstration device of an integrated hydrogen sampler in a containment according to the present invention;

[0024] Among them: 1-nut, 2-backflush channel, 3-silver zeolite section, 31-filter screen, 4-check valve, 5-throttling orifice plate, 6-lower head end, 7-filter plate slot, 8-bracket, 9-sampler model, 10-base, 11-support structure. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below with reference to the accompanying drawings:

[0026] Specific implementation method 1: See Figure 1The embodiment is described in detail. The integrated hydrogen sampler demonstration device in the containment described in the embodiment specifically includes a sampler model 9 and a support structure 11. The sampler model 9 is installed on the support structure 11. The sampler model 9 includes a backflush channel 2, a silver zeolite section 3, a check valve 4, a throttling orifice plate 5 and a filter plate slot 7. The filter plate slot 7, the throttling orifice plate 5 and the silver zeolite section 3 are sequentially installed inside the sampler model 9 from bottom to top. The check valve 4 is arranged between the throttling orifice plate 5 and the silver zeolite section 3 and is installed on the throttling orifice plate 5. The upper end of the check valve 4 is installed with a backflush channel 2, and the backflush channel 2 runs through the silver zeolite section 3. 3; a metal fiber filter plate is installed on the filter plate slot 7, a lower head section 6 is formed between the metal fiber filter plate and the throttling orifice plate 5, and the check valve 4 is connected to the lower head section 6; an air flow outlet is arranged at the top of the sampler model 9, and the hydrogen to be sampled enters from the bottom end of the sampler model 9, passes through the metal fiber filter plate, the throttling orifice plate 5, and the silver zeolite section 3 to reach the upper end of the sampler model 9 and flows out from the outlet; when the metal fiber filter plate is blocked, the gas will flow into the sampler model 9 from the upper end, flow into from the upper end of the backflush channel 2, and pass through the check valve 4 to clean the metal fiber filter plate at a relatively large flow rate.

[0027] The silver zeolite section 3 includes two filter screens 31 and a plurality of silver zeolites. The plurality of silver zeolites are arranged between the two filter screens 31 and are supported by the filter screens 31 to filter the gas.

[0028] The two filter screens 31 are installed inside the sampler model 9 by welding.

[0029] The sampler model 9 also includes a nut 1, and the upper end of the backflush channel 2 is fixed to the upper filter screen 31 of the two through the nut 1, and the nut 1 and the backflush channel 2 are connected together by welding; the nut 1 is an M6 nut.

[0030] The sampler model 9 further includes two buckles 12, which cooperate with the support structure 11 to fix the sampler model 9; the buckles 12 are installed on the back of the sampler model 9 through a connecting rod.

[0031] The support structure 11 includes a bracket 8 and a base 11 . The bracket 8 is vertically mounted on the base 11 . Two card slots are arranged on the bracket 8 . The buckles 12 are inserted into the card slots to fix the sampler model 9 to the bracket 8 .

[0032] The bracket 8 is connected to the base 11 by welding.

[0033] The sampler model 9 is a semi-cylindrical structure, which makes it convenient for viewers to understand the internal structure of the sampler model 9.

[0034] The top of the sampler model 9 is a conical structure, which can speed up the gas outflow speed and reduce the flow resistance of the gas entering the downstream equipment, while ensuring that the backwash gas forms a critical flow, achieving the effect of reducing pressure and speeding up.

[0035] The integrated hydrogen sampler demonstration device in the containment described in the present invention is used for popular science demonstration of low-temperature pool-type nuclear heating reactors. The demonstration method of the device specifically includes assuming that the reactor is in an accident condition, the pressure in the containment is 5Mpa, and the temperature is 200°C. The high-temperature, high-pressure and highly radioactive gas in the reactor flows through the metal fiber filter plate and enters the lower head section 6; flows through the throttling orifice plate 5 from the lower head section 6, and the flow rate and velocity of the gas are controlled based on the critical theory, and its superheat is maintained to meet the filtration efficiency requirements of the silver zeolite section 3; flows out of the sampler model 9 after passing through the silver zeolite section 3; the stable flow of non-radioactive gas flows into the monitoring device at the rear end.

[0036] The device of the present invention demonstrates the basic heating principle and safety characteristics of the low-temperature pool-type nuclear heating reactor to the public, eliminates the public's fear of nuclear power, and provides support conditions for the promotion of nuclear energy heating in the future.

[0037] To summarize the above implementation cases, the integrated hydrogen sampler demonstration device in the containment described in the present invention, compared with other reactor display devices, demonstrates the filtering process of hydrogen containing radioactive substances by the hydrogen sampler in the containment under the reactor accident conditions. The whole device adopts a stainless steel structure to intuitively show the filtering process and principle to the viewer; the integrated hydrogen sampler demonstration device in the containment described in the present invention, in the test, under the accident conditions, the pressure in the containment is 5Mpa, the temperature is 200℃, and the filtering device can ensure that the filtering efficiency of radioactive aerosols, radioactive methyl iodine, radioactive iodine element, etc. reaches more than 99.99%. The throttling orifice device realizes that the gas superheat can reach 5 to 25℃, ensuring the normal filtering efficiency of silver zeolite; at the same time, the flow rate is maintained stable at 3 to 5L / min, ensuring the measurement accuracy of the back-end measurement equipment; the integrated hydrogen sampler demonstration device in the containment described in the present invention can be applied to popular science and teaching, promote nuclear energy and eliminate the public's fear of nuclear energy.

[0038] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the invention. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A demonstration device for an integrated hydrogen sampler in a containment vessel, Features: The invention comprises a sampler model (9) and a supporting structure (11), wherein the sampler model (9) is mounted on the supporting structure (11), wherein the sampler model (9) comprises a backflush channel (2), a silver zeolite section (3), a check valve (4), a throttling orifice plate (5) and a filter plate slot (7), wherein the filter plate slot (7), the throttling orifice plate (5) and the silver zeolite section (3) are sequentially mounted inside the sampler model (9) from bottom to top, wherein the check valve (4) is mounted on the throttling orifice plate (5), wherein the upper end of the check valve (4) is mounted with a backflush channel (2), and the backflush channel (2) penetrates the silver zeolite section (3); wherein a metal fiber filter plate is mounted on the filter plate slot (7); and an air flow outlet is arranged at the top of the sampler model (9).

2. The integrated hydrogen sampler demonstration device in the containment according to claim 1, Features: The silver zeolite section (3) comprises two filter screens (31) and a plurality of silver zeolites, wherein the plurality of silver zeolites are arranged between the two filter screens (31).

3. The integrated hydrogen sampler demonstration device in the containment according to claim 2, Features: The two filter screens (31) are installed inside the sampler model (9) by welding.

4. The integrated hydrogen sampler demonstration device in the containment according to claim 2 or 3, Features: The sampler model (9) further comprises a nut (1), and the upper end of the backflush channel (2) is fixed to the upper filter screen (31) through the nut (1).

5. The integrated hydrogen sampler demonstration device in the containment according to claim 1, 2 or 3, Features: The sampler model (9) further comprises two buckles (12), and the two buckles (12) cooperate with the supporting structure (11) to fix the sampler model (9).

6. The integrated hydrogen sampler demonstration device in the containment according to claim 5, Features: The support structure (11) comprises a bracket (8) and a base (11), wherein the bracket (8) is vertically mounted on the base (11) and cooperates with two buckles (12).

7. The integrated hydrogen sampler demonstration device in the containment according to claim 6, Features: The bracket (8) and the base (11) are connected by welding.

8. The integrated hydrogen sampler demonstration device in the containment according to claim 1, 2, 3, 6 or 7, Features: The sampler model (9) is a semi-cylindrical structure.

9. The integrated hydrogen sampler demonstration device in the containment according to claim 8, Features: The top of the sampler model (9) is a cone-shaped structure.

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