Test system for fuel gas detection instrument

Abstract

The utility model relates to the technical field of gas detection systems, in particular to a test system for a gas detection instrument. According to the technical scheme, the testing system comprises an instrument to be tested, and the testing system comprises a gas cylinder assembly for storing various gases; the output end of the gas cylinder assembly is connected with a buffer tank through a pipeline; the output end of the buffer tank is connected with a sealing box through a pipeline, one side of the sealing box is further provided with a circulating constant-temperature water bath for ensuring that the temperature of the sealing box is stable, and the discharge end of the sealing box is further connected with a gas collection assembly through a pipeline; and a gas chromatograph is arranged on one side of the sealing box. The test system is perfect, the to-be-tested instrument is compared with the gas chromatography, correction factors required by the to-be-tested instrument under different hydrogen doping ratio conditions are obtained, the accuracy, repeatability, detection limit and response time of the instrument are tested, the use safety of the gas detection instrument is ensured, and the gas use safety effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection systems, in particular to a test system for a gas detection instrument for gas detection. Background Technique

[0002] Developing the hydrogen energy industry is of great significance for building a clean, low-carbon, safe and efficient modern energy system, achieving the "dual carbon" goal and high-quality economic development. Mixing hydrogen into natural gas in a certain proportion and then transporting it through natural gas pipelines or pipe networks is an effective way to achieve large-scale hydrogen transportation. Different from combustible gases such as methane, hydrogen has many special properties, such as very low density, low ignition energy, large diffusion coefficient and easy deterioration of the mechanical properties of materials. There are potential risks of leakage, combustion and explosion during the preparation, storage, transportation, filling and use of hydrogen. Therefore, hydrogen safety has always been the primary problem that needs to be solved urgently in the application of hydrogen energy and large-scale commercial promotion.

[0003] At present, the principles of the leakage detection equipment mainly used by gas enterprises include catalytic combustion, thermal conduction, semiconductor, infrared and laser. Most gas sensors are sensitive to several gases that are not the target detection gases, and there are also differences in the sensitivity levels affected by sensors with different detection principles. Therefore, it is urgent to develop a method for measuring the influence on the test readings of existing leakage detection equipment of gas enterprises under different hydrogen blending ratios (hydrogen + natural gas), so as to evaluate in which cases the existing detection instruments can be used and in which cases new leakage detection instruments need to be adopted or the existing leakage detection instruments need to be corrected. However, at present, gas companies do not have a system for testing the influence degree of existing gas leakage detection instruments after hydrogen doping, which cannot ensure the accuracy of the readings of the leakage detection instruments, and there are also potential safety hazards in the transportation and use of gas for the detection instruments with reading differences.

[0004] In view of the above reasons, this application proposes a test system for measuring the accuracy of the readings of gas detection instruments under constant temperature conditions. Summary of the Invention

[0005] The purpose of the utility model is to solve the problems in the background technique and propose a test system for measuring the accuracy of the readings of gas detection instruments under constant temperature conditions.

[0006] The technical solution of the utility model: A test system for a gas detection instrument, including the instrument to be tested, and the test system includes a gas cylinder assembly for storing various gases;

[0007] The output end of the gas cylinder assembly is connected to a buffer tank through a pipeline;

[0008] The output end of the buffer tank is connected to a sealed box through a pipeline. A circulating constant temperature water bath for ensuring the stable temperature of the sealed box is also provided on one side of the sealed box. The discharge end of the sealed box is also connected to a gas collection assembly through a pipeline;

[0009] A gas chromatograph is provided on one side of the sealed box.

[0010] Optionally, a sensor assembly is installed on the sealed box. The sensor assembly includes a pressure sensor and a temperature sensor.

[0011] Optionally, the gas cylinder assembly includes a nitrogen gas cylinder, a methane gas cylinder, and a hydrogen gas cylinder. The nitrogen gas cylinder, the methane gas cylinder, and the hydrogen gas cylinder are respectively connected to a control valve through pipelines. The control valve is installed on the inlet pipeline of the buffer tank.

[0012] Optionally, a reserved port is provided on the sealed box. A six-way valve is installed on the connecting pipeline between the reserved port and the gas chromatograph through a pipeline.

[0013] Optionally, a reserved pipe orifice is also provided on the sealed box for sealed connection with the instrument to be tested.

[0014] Optionally, a closed loop is formed among the sealed box, the instrument to be tested, and the circulating constant temperature water bath.

[0015] Optionally, the gas collection assembly includes a vacuum pump and a gas collection bag.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] The utility model adopts a gas chromatograph, which can more accurately compare with the detected data of the instrument to be tested, clarify the influence of different hydrogen doping ratios on the detection readings of the instrument to be tested, and guide the calibration and use of subsequent equipment;

[0018] The constant temperature circulating water bath device adopted by the utility model can ensure that during the detection, the detection result is not interfered by temperature changes. At the same time, it can test whether the detection result is affected under different temperature conditions, and can more scientifically obtain the hydrogen doping ratio correction coefficient;

[0019] The utility model tests the influence of different gas compositions on the detection results of different instruments to be tested by changing the gas types, and evaluates whether the instrument can be used normally in such a gas environment and whether calibration is required;

[0020] In summary, the test system of the utility model is perfect. By comparing the instrument to be tested with the gas chromatograph, the correction factors required by the instrument to be tested under different hydrogen doping ratios are obtained, and the accuracy, repeatability, detection limit, and response time of the instrument are tested to ensure the safety of the use of the gas detection instrument and improve the gas use safety effect. Description of the Drawings

[0021] Figure 1 The structural schematic diagram of the present utility model is given.

[0022] Reference numerals: 1, gas cylinder assembly; 11, nitrogen gas cylinder; 12, methane gas cylinder; 13, hydrogen gas cylinder; 2, buffer tank; 3, pressure sensor; 4, temperature sensor; 5, sealed box; 6, instrument to be measured; 7, circulating constant temperature water bath; 8, six-way valve; 9, gas chromatograph; 10, gas collection assembly. Detailed Embodiments

[0023] The technical solutions of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments.

[0024] Generally, the components of the embodiments of the present disclosure described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure to be protected, but merely represents the selected embodiments of the present disclosure.

[0025] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without making creative efforts belong to the scope of protection of the present disclosure.

[0026] In the description of the present disclosure, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

[0027] In the description of the present disclosure, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; 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 communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0028] Embodiment

[0029] As Figure 1As shown in the figure, a test system for a gas detection instrument proposed by the present utility model includes a to-be-tested instrument 6. The test system includes a gas cylinder assembly 1 for storing various gases. The gas cylinder assembly 1 includes a nitrogen gas cylinder 11, a methane gas cylinder 12, and a hydrogen gas cylinder 13. The nitrogen gas cylinder 11, the methane gas cylinder 12, and the hydrogen gas cylinder 13 are respectively connected to a control valve through pipelines. The control valve is installed on the inlet pipeline of the buffer tank 2.

[0030] The output end of the gas cylinder assembly 1 is connected to a buffer tank 2 through a pipeline. The design of adding the buffer tank 2 is made between the buffer tank 2 and the sealed box 5, and a pressure sensor 3 is provided on the sealed box 5 to monitor the pressure change in real time and avoid excessive pressure change.

[0031] The output end of the buffer tank 2 is connected to a sealed box 5 through a pipeline. The sealed box 5 is also provided with a reserved pipe orifice for sealed connection with the to-be-tested instrument 6.

[0032] A sensor assembly is installed on the sealed box 5. The sensor assembly includes a pressure sensor 3 and a temperature sensor 4. A circulating constant temperature water bath 7 for ensuring its temperature stability is also provided on one side of the sealed box 5. The discharge end of the sealed box 5 is also connected to a gas collection assembly 10 through a pipeline. The gas collection assembly 10 includes a vacuum pump and a gas collection bag.

[0033] A gas chromatograph 9 is provided on one side of the sealed box 5. The sealed box 5 is provided with a reserved orifice. The reserved orifice and the gas chromatograph 9 are connected through a pipeline, and a six-way valve 8 is installed on the connecting pipeline.

[0034] A closed loop is formed among the sealed box 5, the to-be-tested instrument 6, and the circulating constant temperature water bath 7.

[0035] The detection of the detection instrument in this embodiment specifically includes the following operation steps:

[0036] 1. Detect the equipment status: Whether the gas cylinder pressure is normal, whether each valve opens and closes normally, whether the buffer tank 2 is emptied, whether the circulating constant temperature water bath 7 operates normally, whether the airtightness of the sealed box 5 is intact, whether the vacuum pump starts and stops normally, and whether the temperature sensor 4 and the pressure sensor 3 are normal.

[0037] 2. Nitrogen purging: First, open the valve of the nitrogen gas cylinder 11, and use the vacuum pump to purge the gases in the buffer tank 2 and the sealed box 5 to ensure that there is no oxygen and other impurity gases in the experimental loop. At this time, detect through the gas chromatograph 9 to ensure the nitrogen purity in the sealed box 5.

[0038] 3. Experimental temperature control: According to the designed experimental temperature, start the temperature control system, and use the circulating constant temperature water bath 7 to control the temperature of the entire sealed box 5. Observe the temperature control thermometer to make the temperature of the experimental environment reach the set constant value and complete the temperature control step.

[0039] 4. Methane introduction: Open the methane gas cylinder 12, slowly introduce the methane in the cylinder into the buffer tank 2, and then steadily introduce the gas in the buffer tank 2 into the sealed box 5. Observe the methane concentration value displayed by the gas chromatograph 9. When the concentration reaches more than 99%, close the valve on the buffer tank 2.

[0040] 5. Hydrogen introduction: Open the hydrogen gas cylinder 13, slowly introduce the hydrogen in the cylinder into the buffer tank 2, and then steadily introduce the gas in the buffer tank 2 into the sealed box 5. Observe the hydrogen concentration value displayed by the gas chromatograph 9. When the concentration reaches the desired hydrogen doping ratio, close the valve of the buffer tank 2. The measurement principle of the hydrogen doping ratio is in ascending order, increasing from 1% to the maximum hydrogen doping ratio in turn.

[0041] 6. Measurement of the instrument to be tested: After reaching the first desired hydrogen doping ratio, place the instrument 6 to be tested at the reserved opening of the sealed box 5, observe for 1 - 3 minutes, and record relevant data such as accuracy, repeatability, detection limit, and response time. Replace the instrument 6 to be tested in turn for each hydrogen doping ratio, and then increase the hydrogen doping ratio in turn for cyclic measurement.

[0042] 7. Experimental recovery: After completing the experiment, turn on the vacuum pump in the gas collection assembly 10 connected to the sealed box 5, collect the gas into the gas collection bag, then turn off the vacuum pump, open the nitrogen gas cylinder 11, and purge the buffer tank 2 and the sealed box 5 in turn until the methane and hydrogen concentrations drop below 1%.

[0043] This embodiment can realize the comprehensive quantitative test of the performance of the instrument 6 to be tested; the equipped gas chromatograph 9 can simultaneously complete the accurate measurement of multi-component gases. It can not only change different hydrogen doping ratios, but also introduce interfering gases such as carbon dioxide and ethane to quantitatively compare the influence degree on the test results of the instrument 6 to be tested, and realize the test of the performance of the equipment to be tested such as accuracy, repeatability, detection limit, and response time.

[0044] The above specific embodiments are only several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A test system for a gas detection instrument, comprising an instrument to be tested (6), characterized in that: The described test system includes a gas cylinder assembly (1) for storing multiple gases; The output end of the gas cylinder assembly (1) is connected to a buffer tank (2) through a pipeline; The output end of the buffer tank (2) is connected to a sealed box (5) through a pipeline. A circulating constant temperature water bath (7) for ensuring the stable temperature is arranged on one side of the sealed box (5). The discharge end of the sealed box (5) is also connected to a gas collection assembly (10) through a pipeline; A gas chromatograph (9) is arranged on one side of the sealed box (5).

2. The test system for a gas detection instrument according to claim 1, characterized in that, A sensor assembly is installed on the sealed box (5), and the sensor assembly includes a pressure sensor (3) and a temperature sensor (4).

3. A test system for a gas detection instrument according to claim 1, characterized in that, The gas cylinder assembly (1) includes a nitrogen gas cylinder (11), a methane gas cylinder (12), and a hydrogen gas cylinder (13). The nitrogen gas cylinder (11), the methane gas cylinder (12), and the hydrogen gas cylinder (13) are respectively connected to a control valve through pipelines, and the control valve is installed on the inlet pipeline of the buffer tank (2).

4. A test system for a gas detection instrument according to claim 1, characterized in that, A reserved port is arranged on the sealed box (5), and the reserved port is connected to the gas chromatograph (9) through a pipeline. A six-way valve (8) is installed on the connecting pipeline.

5. A test system for a gas detection instrument according to claim 1, characterized in that, A reserved pipe orifice is also arranged on the sealed box (5) for sealing connection with the instrument to be tested (6).

6. A test system for a gas detection instrument according to claim 1, characterized in that, A closed loop is formed among the sealed box (5), the instrument to be tested (6), and the circulating constant temperature water bath (7).

7. A test system for a gas detection instrument according to claim 1, characterized in that, The gas collection assembly (10) includes a vacuum pump and a gas collection bag.

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