Combustible gas premixed combustion test system

Abstract

The utility model discloses a combustible gas premixed combustion test system. The combustible gas premixed combustion test system comprises a gas supply control device, a premixed combustion device and a tail gas treatment and emission device which are connected in sequence, the air supply control device comprises an air supply unit, a steam supply unit and an air supply unit; the air supply unit is connected with an air supply pipeline, the steam supply unit is connected with a steam pipeline, the air supply unit is connected with an air pipeline, and the air supply pipeline, the steam pipeline and the air pipeline are all provided with flow control mechanisms. The air supply pipeline, the steam pipeline and the air pipeline are communicated at the input end of the premixed combustion device and then are connected with the premixed combustion device through a main pipeline. According to the utility model, the flow of the reaction gas in the combustion test can be accurately controlled through the gas supply control device, so that the stability and the safety of the combustion test are improved.

Description

Technical Field

[0001] The utility model relates to the field of nuclear energy, in particular to a combustible gas premixed combustion test system. Background Art

[0002] During the severe accident process of a pressurized water reactor nuclear power plant, a large amount of hydrogen is generated in processes such as the reaction between zirconium alloy cladding and steam and the interaction between the molten core outside the pressure vessel and concrete, and is released into the containment space. Under certain conditions, these mixed gases may undergo deflagration or even explosion, and the resulting high temperature and pressure loads will endanger the integrity of the containment, and radioactive fission products may thus be released into the environment, causing serious consequences. In the control scheme of severe accidents in nuclear power plants, the control of combustible gases is an important part of alleviating severe accidents. Therefore, it is necessary to carry out corresponding combustion tests on combustible gases to assist in the design and analysis of combustible gas control systems in nuclear power plants.

[0003] However, due to the complex phenomenon of premixed combustion of combustible gases, on the one hand, the flame temperature is high and the front propagation speed is fast during combustion, making it difficult to accurately measure flame combustion parameters; on the other hand, the instantaneous pressure generated during the reaction of high-concentration combustible gases is relatively high, which may damage the integrity of the device, resulting in difficulty in stably carrying out the combustion test and affecting the safety of the test. Therefore, precise control of the combustible gases undergoing reaction in the test is very important. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a combustible gas premixed combustion test system.

[0005] The technical solution adopted by the utility model to solve its technical problem is to construct a combustible gas premixed combustion test system, which includes a gas supply control device, a premixed combustion device, and an exhaust gas treatment and discharge device connected in sequence; the gas supply control device includes a gas supply unit, a steam supply unit, and an air supply unit; the gas supply unit is connected to a gas supply pipeline, the steam supply unit is connected to a steam pipeline, the air supply unit is connected to an air pipeline, flow control mechanisms are provided on the gas supply pipeline, the steam pipeline, and the air pipeline, and the gas supply pipeline, the steam pipeline, and the air pipeline are connected to the premixed combustion device through a main pipeline after being connected at the input end of the premixed combustion device.

[0006] Preferably, a flame arrester is further provided on the gas supply pipeline, and the flame arrester is arranged between the gas supply unit and the flow control mechanism.

[0007] Preferably, a pressure reducing valve is further provided on the gas supply pipeline, and the pressure reducing valve is arranged between the gas supply unit and the flame arrester.

[0008] Preferably, the gas supply unit includes a plurality of gas cylinders, and the same or different combustible gases are stored in each of the gas cylinders; the plurality of gas cylinders are all connected to the gas supply pipeline.

[0009] Preferably, the premixed combustion device includes a pressure vessel and an igniter, and the igniter is arranged at the lower part of the pressure vessel; the pressure vessel is provided with a pressure vessel inlet and a pressure vessel outlet, the pressure vessel inlet is connected to the main pipeline, the pressure vessel outlet is connected to the tail gas treatment and emission device through an exhaust pipeline, and a pipeline valve is arranged on the exhaust pipeline.

[0010] Preferably, the pressure vessel is further provided with a combustion detection mechanism, a gas concentration detection mechanism and a pressure detection mechanism.

[0011] Preferably, the gas concentration detection mechanism is arranged at the upper part and / or the lower part of the pressure vessel; the combustion detection mechanism is arranged at the center line position inside the pressure vessel.

[0012] Preferably, the outer part of the pressure vessel is coated with a heat preservation material layer.

[0013] Preferably, the tail gas treatment and emission device includes a tail gas treatment mechanism and a pressure relief mechanism; one end of the tail gas treatment mechanism is connected to the premixed combustion device, the other end of the tail gas treatment mechanism is connected to the pressure relief mechanism, and an exhaust port is arranged on the pressure relief mechanism.

[0014] Preferably, a honeycomb catalyst is arranged in the tail gas treatment mechanism.

[0015] Implementing the present utility model has the following beneficial effects: The present utility model can accurately control the flow rate of the reaction gas in the combustion test through the gas supply control device, improving the stability and safety of the combustion test.

[0016] The present utility model can also measure the parameters of the flame temperature and flame speed during the combustion process, and then accurately control the start of the combustion reaction.

[0017] The present utility model can also harmlessly treat the toxic and / or combustible tail gas generated during combustion, further improving the safety of the test. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0019] Figure 1 is the schematic structural diagram of the utility model;

[0020] Figure 2 is the schematic structural diagram of the air supply control device of the utility model;

[0021] Figure 3 is the schematic structural diagram of the premixed combustion device of the utility model;

[0022] Figure 4 is the schematic structural diagram of the tail gas treatment and emission device of the utility model.

[0023] Explanation of reference numerals:

[0024] 1 - air supply control device; 2 - premixed combustion device; 3 - tail gas treatment and emission device; 11 - air supply unit; 12 - steam supply unit; 13 - air supply unit; 14 - flow control mechanism; 4 - main pipeline; 15 - flame arrester; 16 - pressure reducing valve; 111 - gas cylinder; 21 - pressure vessel; 22 - igniter; 5 - pipeline valve; 23 - combustion detection mechanism; 24 - gas concentration detection mechanism; 25 - pressure detection mechanism; 31 - tail gas treatment mechanism; 32 - pressure relief mechanism; 321 - exhaust port; 6 - air supply pipeline; 7 - steam pipeline; 8 - air pipeline; 9 - emission pipeline. Specific embodiments

[0025] In order to have a clearer understanding of the technical features, objectives, and effects of the utility model, the specific embodiments of the utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "upper", "lower", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, with a specific orientation structure and operation, and are only for the convenience of describing the technical solution, rather than indicating that the indicated device or element must have a specific orientation, and thus should not be construed as a limitation of the utility model.

[0026] It should also be noted that unless otherwise clearly specified and limited, terms such as "connection", "arrangement", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as being "above" or "below" another element, the element can be "directly" or "indirectly" located above the other element, or there may also be one or more intermediate elements.

[0027] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0028] In the design analysis of the existing combustible gas control system in nuclear power plants, it is generally designed based on the assumption that the combustible gas is hydrogen. In one of the designs, the cladding material used is zirconium alloy, and the containment concrete is silica-based concrete. The main type of combustible gas generated during a severe accident is hydrogen. However, in the study of SiC cladding, SiC undergoes an oxidation reaction at high temperatures to generate CO. Therefore, the system of the present application can not only be used in general combustion reaction experimental studies but also carry out premixed combustion test studies on a mixture of CO and hydrogen.

[0029] Embodiment 1:

[0030] Please refer to Figure 1-2 , this embodiment shows a premixed combustion test system for combustible gas, which includes a gas supply control device 1, a premixed combustion device 2, and an exhaust gas treatment and discharge device 3 connected in sequence; the gas supply control device 1 includes a gas supply unit 11, a steam supply unit 12, and an air supply unit 13; the gas supply unit 11 is connected to a gas supply pipeline 6, the steam supply unit 12 is connected to a steam pipeline 7, and the air supply unit 13 is connected to an air pipeline 8. Flow control mechanisms 14 are provided on the gas supply pipeline 6, the steam pipeline 7, and the air pipeline 8. After the gas supply pipeline 6, the steam pipeline 7, and the air pipeline 8 are connected at the input end of the premixed combustion device 2, they are connected to the premixed combustion device 2 through a main pipeline 4.

[0031] Among them, the gas supply control device 1 is used to provide the gas required for the combustion reaction, and the type of gas provided can be set according to the actual test requirements; the premixed combustion device 2 is used to provide the required combustion space for the combustion reaction and isolate the influence of the external environment on the combustion reaction, ensuring the stable and safe progress of the combustion reaction; the tail gas treatment and emission device 3 is used to treat the poisonous gas generated in the combustion reaction or the remaining unburned combustible gas after the combustion reaction, ensuring the safety of the test process. Specifically, the gas supply unit 11 is used to store and provide the required pure combustion reaction gas; the steam supply unit 12 is used to provide the water vapor required for the combustion reaction; the air supply unit 13 is used to precisely control the compression and provide the air required for the combustion reaction; the gas supply pipeline 6 is used to transport the reaction gas in the gas supply unit 11 to the input end of the premixed combustion device 2; the steam pipeline 7 is used to transport the water vapor in the steam supply unit 12 to the input end of the premixed combustion device 2; the air pipeline 8 is used to transport the compressed air in the air supply unit 13 to the input end of the premixed combustion device 2; the main pipeline 4 is used to mix the gases in the above three pipelines and then input them into the premixed combustion device 2; the flow control mechanism 14 is arranged on the pipeline and is used to precisely control the flow rate of the gas in the pipeline.

[0032] In this embodiment, the gas supply unit 11, the steam supply unit 12, and the air supply unit 13 of the gas supply control device 1 respectively input the reaction gas, water vapor, and compressed air into their respective pipelines. During this process, the flow control mechanism 14 precisely controls the flow rate in the pipeline. The control method can be to set a valve and control the opening size of the valve to precisely control the flow rate, thereby precisely controlling the flow rate of the gas in the pipeline and finally controlling the concentration of each gas during mixing to achieve precise control of the reaction gas concentration in the combustion reaction, control the process of the combustion reaction, and improve the stability and safety of the combustion reaction test. Optionally, the flow control mechanism 14 uses a flow controller.

[0033] And in order to further improve the safety of the test process, in this embodiment, as shown in the appendix Figure 2 As shown, a flame arrester 15 is also provided on the gas supply pipeline 6, and the flame arrester 15 is arranged between the gas supply unit 11 and the flow control mechanism 14. The function of the flame arrester 15 is to prevent the flame from reversing and igniting the reaction gas storage device.

[0034] Furthermore, in order to improve the safety of the test process, in this embodiment, as shown in the appendix Figure 2As shown, a pressure reducing valve 16 is further provided on the gas supply pipeline 6, and the pressure reducing valve 16 is arranged between the gas supply unit 11 and the flame arrester 15. The function of the pressure reducing valve 16 is to regulate and stabilize the pressure in the pipeline and prevent gas backflow. In this embodiment, optionally, the gas supply unit 11 includes a plurality of gas cylinders 111, and the same or different combustible gases are stored in each gas cylinder 111; the plurality of gas cylinders 111 are all connected to the gas supply pipeline 6. Among them, the gas cylinder 111 is used to load the reaction gas, and its quantity and type are designed according to the test requirements, and the reaction gas loaded therein includes but is not limited to H2, CO, CH4, etc. Preferably, the gas cylinder 111 can be a steel gas cylinder 111, and the steel gas cylinder 111 can meet the safety requirements of the test.

[0035] In this embodiment, the steam supply unit 12 can be a steam boiler; the air supply unit 13 can be an air compressor.

[0036] Embodiment Two:

[0037] Based on the structure set in Embodiment One, this embodiment further optimizes the premixed combustion device 2, as shown in the attached Figure 1 and the attached Figure 3 As shown, the premixed combustion device 2 includes a pressure vessel 21 and an igniter 22, and the igniter 22 is arranged at the lower part of the pressure vessel 21; the pressure vessel 21 is provided with a pressure vessel 21 inlet and a pressure vessel 21 outlet, the pressure vessel 21 inlet is connected to the main pipeline 4, the pressure vessel 21 outlet is connected to the tail gas treatment and emission device 3 through the discharge pipeline 9, and a pipeline valve 5 is arranged on the discharge pipeline 9.

[0038] Among them, the pressure vessel 21 is used to provide a stable and safe space for the reaction of the combustion test; the igniter 22 is used to ignite the gas inside the pressure vessel 21, and its types include but are not limited to a spark ignition type igniter 22 and a continuous ignition type igniter 22, depending on the type of gas in the pressure vessel 21; the pressure vessel 21 inlet is used to input the combustion reaction gas into the pressure vessel 21, and the pressure vessel 21 outlet is used to discharge the poisonous gas generated by the combustion reaction and the remaining gas after the combustion reaction to the tail gas treatment and emission device 3; the discharge pipeline 9 is used to input the above-mentioned gas into the tail gas emission device; the pipeline valve 5 is used to control the gas flow rate in this pipeline.

[0039] In this embodiment, when the gas enters the pressure vessel 21 through the pressure vessel 21 inlet, after the gas injection in the pressure vessel 21 is completed and evenly distributed, the igniter 22 is turned on to ignite the gas.

[0040] Furthermore, in order to accurately measure various parameters in the combustion reaction, including flame temperature, flame speed, pressure, etc., as shown in the attached Figure 3As shown, the pressure vessel 21 is also provided with a combustion detection mechanism 23, a gas concentration detection mechanism 24, and a pressure detection mechanism 25. Among them, the combustion detection mechanism 23 is used to measure the temperature of the combustion flame and the propagation speed of the flame front in the combustion reaction; the gas concentration detection mechanism 24 is used to measure the concentration of the gas.

[0041] And in order to further improve the measurement accuracy, as shown in the appendix Figure 3 As shown, the gas concentration detection mechanism 24 is arranged at the upper part and / or the lower part of the pressure vessel 21; the combustion detection mechanism 23 is arranged at the center line position inside the pressure vessel 21, and the pressure detection mechanism 25 is arranged inside the pressure vessel 21. Further, multiple combustion detection mechanisms 23 and gas concentration detection mechanisms 24 can be arranged, and the multiple combustion detection mechanisms 23 need to be equidistantly distributed from top to bottom. For example, in one example of this embodiment, the pressure vessel 21 is provided with at least three combustion detection mechanisms 23 and at least two gas concentration detection mechanisms 24, and the at least three combustion detection mechanisms 23 are equidistantly distributed from top to bottom.

[0042] Further, in one example of this embodiment, the measurement range of the combustion detection mechanism 23 is 0 - 1500 °C; the measurement range of the pressure detection mechanism 25 is at least 0 - 5 MPa.

[0043] Optionally, the combustion detection mechanism 23 uses a thermocouple, the gas concentration detection mechanism 24 uses a gas concentration analyzer, and the pressure detection mechanism 25 uses a pressure probe.

[0044] Preferably, the outside of the pressure vessel 21 is coated with a heat insulation material layer. Coating the outside of the pressure vessel 21 with a material heat insulation layer can further increase the pressure-bearing range and ensure that the pressure-bearing range is within 0 - 5 MPa.

[0045] Embodiment Three:

[0046] This embodiment is based on Embodiment One or Embodiment Two, and further optimizes the structure of the tail gas treatment device. As shown in the appendix Figure 1 and the appendix Figure 4 As shown, the tail gas treatment and emission device 3 includes a tail gas treatment mechanism 31 and a pressure relief mechanism 32; one end of the tail gas treatment mechanism 31 is connected to the premixed combustion device 2, the other end of the tail gas treatment mechanism 31 is connected to the pressure relief mechanism 32, and an exhaust port 321 is arranged on the pressure relief mechanism 32.

[0047] Among them, the tail gas treatment mechanism 31 converts the toxic gases generated by the combustion reaction and / or the residual gases of the combustion reaction into non-toxic or non-combustible gases for discharge; the pressure relief mechanism 32 is used to further dilute the gases in the tail gas treatment mechanism 31 to improve the safety of the discharged gases; the exhaust port on the pressure relief mechanism 32 communicates with the atmosphere for exhaust.

[0048] Further, a honeycomb catalyst is arranged in the tail gas treatment mechanism 31, which is used to catalytically convert unburned toxic gases and / or combustible gases into non-toxic / incombustible gases.

[0049] Further, in order to further improve the safety of the discharged gas, the volume of the tail gas treatment mechanism 31 is more than ten times the volume of the pressure vessel 21, and the pressure bearing range is not less than 0 - 1 MPa.

[0050] In this embodiment, the tail gas treatment mechanism 31 can be selected as a tail gas catalytic recombiner; the pressure relief mechanism 32 can be selected as a pressure relief tank.

[0051] It can be understood that the above embodiments only represent the preferred implementation modes of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A combustible gas premix combustion test system, characterized in that: It comprises an air supply control device, a premixed combustion device and an exhaust gas treatment and emission device which are connected in sequence; the air supply control device comprises an air supply unit, a steam supply unit and an air supply unit; the air supply unit is connected to an air supply pipeline, the steam supply unit is connected to a steam pipeline, the air supply unit is connected to an air pipeline, and the air supply pipeline, the steam pipeline and the air pipeline are all provided with flow control mechanisms, and the air supply pipeline, the steam pipeline and the air pipeline are connected to the premixed combustion device through a main pipeline after being connected at the input end of the premixed combustion device.

2. The combustible gas premix combustion test system according to claim 1, characterized in that: The gas supply pipeline is also provided with a flame arrester, and the flame arrester is arranged between the gas supply unit and the flow control mechanism.

3. The combustible gas premix combustion test system according to claim 2, characterized in that: The gas supply pipeline is also provided with a pressure reducing valve, and the pressure reducing valve is arranged between the gas supply unit and the flame arrester.

4. The combustible gas premix combustion test system according to claim 1, characterized in that: The gas supply unit includes a plurality of gas cylinders, each of which stores the same or different combustible gases; The several gas cylinders are all connected to the gas supply pipeline.

5. The combustible gas premix combustion test system according to claim 1, characterized in that: The premixed combustion device includes a pressure vessel and an igniter, wherein the igniter is arranged at the lower part of the pressure vessel; the pressure vessel is provided with a pressure vessel inlet and a pressure vessel outlet, wherein the pressure vessel inlet is connected to the main pipeline, and the pressure vessel outlet is connected to the exhaust gas treatment discharge device through a discharge pipeline, and a pipeline valve is provided on the discharge pipeline.

6. The combustible gas premix combustion test system according to claim 5, characterized in that: The pressure container is also provided with a combustion detection mechanism, a gas concentration detection mechanism and a pressure detection mechanism.

7. The combustible gas premix combustion test system according to claim 6, characterized in that: The gas concentration detection mechanism is arranged at the upper part and / or the lower part of the pressure vessel; the combustion detection mechanism is arranged at the center line position inside the pressure vessel.

8. The combustible gas premix combustion test system according to claim 5, characterized in that: The outside of the pressure container is coated with a heat-insulating material layer.

9. The combustible gas premix combustion test system according to claim 1, characterized in that: The tail gas treatment and emission device comprises a tail gas treatment mechanism and a pressure relief mechanism; one end of the tail gas treatment mechanism is connected to the premixed combustion device, and the other end of the tail gas treatment mechanism is connected to the pressure relief mechanism, and the pressure relief mechanism is provided with an exhaust port.

10. The combustible gas premix combustion test system according to claim 9, characterized in that: A honeycomb catalyst is arranged in the exhaust gas treatment mechanism.

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