Online detection device for hydrogen production purified gas

Abstract

The utility model relates to a hydrogen production purified gas online detection device which comprises a mounting panel, a sampling ball valve, a filter, a pressure reducing valve, a drying pipe, a three-way switching valve, a four-way switching valve, a connecting pipe, a gas inlet pipe, a trace oxygen analyzer, an exhaust pipe and a dew point analyzer, the sampling ball valve, the filter, the pressure reducing valve, the drying pipe, the three-way switching valve and the four-way switching valve are sequentially connected through the connecting pipe, and the trace oxygen analyzer is connected with the four-way switching valve through the connecting pipe. The inlet end of the dew point analyzer is connected with the connecting pipe between the pressure reducing valve and the drying pipe through the connecting pipe, and the outlet end of the dew point analyzer is connected with the exhaust pipe through the connecting pipe. The trace oxygen analyzer and the dew point analyzer are integrated on the same sampling pretreatment panel, so that the overall size of the detection device is reduced, the maintenance cost is reduced, and the measurement period is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydrogen production purified gas online detection device. BACKGROUND

[0002] In recent years, with the sustained development of domestic hydrogen energy industry, hydrogen energy, as an important role in clean energy, will become a development focus. Water electrolysis hydrogen production process: electrolytic cell is decomposed into hydrogen and oxygen by electric current Water molecule, the core of this electrolysis process in electrolytic cell is two electrodes. Electrode is immersed in electrolyte separated by membrane. Water is decomposed into hydrogen and oxygen at electrode, and membrane separates these generated gases, in order to ensure the purity of gas, it is necessary to test the purity of hydrogen after electrolysis by analytical instrument, and among them, purification process is a crucial link, hydrogen produced in electrolysis process usually contains different amounts of oxygen and moisture. After crude hydrogen is treated by purification and drying, the purity of purification can reach 4 9 or 5 9, and the two data of trace oxygen and dew point after hydrogen purification are used as the standard of whether the purified gas is qualified. At this time, it is necessary to detect whether high-purity hydrogen is qualified by trace oxygen and dew point analyzer, and the trace oxygen in qualified hydrogen after purification is 0-10ppm, and dew point is ≤-60℃. The existing detection system is two independent devices, which has large volume, high maintenance cost and long operation cycle. Therefore, there is an urgent need for a water electrolysis hydrogen purification process hydrogen sampling pretreatment online detection device, which integrates two analyzers into a pretreatment panel, reduces the volume of detection device, reduces maintenance cost, can independently and quickly process gas, and provides stable, efficient and safe measurement environment for analytical instrument in hydrogen production purification process. SUMMARY

[0003] This section aims to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0004] The technical problem to be solved by the utility model is the problem of large volume, high maintenance cost and long operation cycle of the existing detection device.

[0005] To solve the above technical problems, the utility model provides technical scheme as follows: A kind of hydrogen production purified gas on-line detection device, including mounting panel, sampling ball valve, filter, pressure reducing valve, drying tube, three-way switch valve, four-way switch valve, connecting pipe, air inlet pipe, trace oxygen analyzer, exhaust pipe and dew point analyzer, the sampling ball valve, filter, pressure reducing valve, drying tube, three-way switch valve and four-way switch valve are sequentially arranged on the mounting panel along straight line, the sampling ball valve, filter, pressure reducing valve, drying tube, three-way switch valve and four-way switch valve are sequentially connected by the connecting pipe, the inlet end of the sampling ball valve is connected with external sampling pipeline by the air inlet pipe, the trace oxygen analyzer is arranged on the mounting panel, the trace oxygen analyzer is connected with the four-way switch valve by the connecting pipe, for the trace oxygen detection of hydrogen after purification, the four-way switch valve is connected with external collection pipeline by the exhaust pipe, the dew point analyzer is arranged on the mounting panel, the inlet end of the dew point analyzer is connected with the connecting pipe between the pressure reducing valve and drying tube by the connecting pipe, for the dew point detection of hydrogen after purification, the outlet end of the dew point analyzer is connected with the exhaust pipe by the connecting pipe.

[0006] As a preferred scheme of the hydrogen production purified gas on-line detection device of the utility model, wherein: the outlet end of the pressure reducing valve is provided with a pressure gauge, to monitor the pressure after pressure reduction, to meet the normal use requirements of the analyzer.

[0007] As a preferred scheme of the hydrogen production purified gas on-line detection device of the utility model, wherein: the end of the exhaust pipe close to the four-way switch valve is provided with a first flowmeter, to facilitate monitoring, adjusting, sample flow into the trace oxygen analyzer, to meet the use requirements of the trace oxygen analyzer.

[0008] As a preferred scheme of the hydrogen production purified gas on-line detection device of the utility model, wherein: the outlet end of the dew point analyzer is provided with a second flowmeter, to facilitate monitoring, adjusting, sample flow into the dew point analyzer, to meet the use requirements of the dew point analyzer.

[0009] As a preferred scheme of the hydrogen production purified gas on-line detection device of the utility model, wherein: the tail end of the exhaust pipe is provided with a flame arrester, as a safety device, to prevent the flame spreading of flammable gas and flammable liquid vapor.

[0010] As a preferred scheme of the hydrogen production purified gas on-line detection device of the utility model, wherein: the three-way switch valve is provided with a calibration port, to calibrate the detection device, to improve detection accuracy.

[0011] Beneficial effects: by integrating the micro oxygen analyzer and dew point analyzer on the same sampling pretreatment panel, not only the overall volume of the detection device is reduced, the maintenance cost is reduced, but also the measurement cycle is greatly shortened. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor. Among them:

[0013] Figure 1 The overall structure diagram of the on-line detection device for hydrogen production and purification gas.

[0014] In the figure: 1, mounting panel; 2, sampling ball valve; 3, filter; 4, pressure reducing valve; 5, drying tube; 6, three-way switch valve; 7, four-way switch valve; 8, connecting pipe; 9, gas inlet pipe; 10, micro oxygen analyzer; 11, exhaust pipe; 12, dew point analyzer; 13, pressure gauge; 14, first flowmeter; 15, second flowmeter; 16, flame arrester; 17, calibration pipe mouth. DETAILED DESCRIPTION

[0015] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0016] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0017] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. In this specification, "in one embodiment" does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0018] EMBODIMENT

[0019] REFERENCE Figure 1The embodiment provides an online detection device for hydrogen and purified gas, which comprises a mounting panel 1, a sampling ball valve 2, a filter 3, a pressure reducing valve 4, a drying tube 5, a three-way switching valve 6, a four-way switching valve 7, a connecting pipe 8, an air inlet pipe 9, a trace oxygen analyzer 10, an air outlet pipe 11 and a dew point analyzer 12, the sampling ball valve 2, the filter 3, the pressure reducing valve 4, the drying tube 5, the three-way switching valve 6 and the four-way switching valve 7 are sequentially arranged on the mounting panel 1 in a straight line, the sampling ball valve 2, the filter 3, the pressure reducing valve 4, the drying tube 5, the three-way switching valve 6 and the four-way switching valve 7 are sequentially connected through the connecting pipe 8, the inlet end of the sampling ball valve 2 is connected with external sampling pipelines through the air inlet pipe 9, the trace oxygen analyzer 10 is arranged on the mounting panel 1, the trace oxygen analyzer 10 is connected with the four-way switching valve 7 through the connecting pipe 8, and the four-way switching valve 7 is connected with external collecting pipelines through the air outlet pipe 11, the dew point analyzer 12 is arranged on the mounting panel 1, the inlet end of the dew point analyzer 12 is connected with the connecting pipe 8 between the pressure reducing valve 4 and the drying tube 5 through the connecting pipe 8, and the dew point analyzer 12 is connected with the air outlet pipe 11 through the connecting pipe 8.

[0020] The mounting panel 1 is a 304 stainless steel panel with a size of 690mm*450mm*1.5mm, which is used as the mounting base of the device, and the mounting panel 1 is provided with a 15mm folding edge on each side, and a mounting hole with a diameter of 8mm is formed at each corner, so that the mounting panel 1 is conveniently mounted, and the four corners of the mounting panel 1 need to be chamfered for safety, the sampling ball valve 2, the filter 3, the pressure reducing valve 4, the drying tube 5, the three-way switching valve 6 and the four-way switching valve 7 are sequentially arranged on the mounting panel 1 in a straight line, the sampling ball valve 2 can be opened and closed according to requirements, the inlet end of the sampling ball valve 2 is connected with external sampling pipelines through the air inlet pipe 9, so that the purified hydrogen sample can pass through the air inlet pipe 9, the sampling ball valve 2 and enter the internal pipeline of the detection device, the outlet end of the sampling ball valve 2 is connected with the inlet end of the filter 3 through the connecting pipe 8, so that the purified hydrogen sample can enter the filter 3 and be filtered, it should be noted that the filter 3 in the embodiment is composed of a stainless steel shell and a stainless steel sintered filter element, adopts a straight-through structure, so that the dead volume of the sample gas (the volume of the purified hydrogen sample that may be stuck in the filter 3) is reduced, and the measurement accuracy of the detection device is improved, and the filtering accuracy of the core stainless steel sintered filter element can reach 0.5μm, so that more than 99% of solid particles in the purified hydrogen sample can be removed, thereby ensuring the cleanliness of the purified hydrogen entering the analyzer;

[0021] The outlet end of the filter 3 is connected with the inlet end of the pressure reducing valve 4 through the connecting pipe 8, so that the purified hydrogen sample enters into the pressure reducing valve 4 to reduce the pressure, so as to realize the pressure regulation of the sample gas. The outlet end of the pressure reducing valve 4 is connected with the inlet end of the drying pipe 5 through the connecting pipe 8, so that the purified hydrogen sample enters into the drying pipe 5 to dry and further remove impurities. The drying pipe 5 in the embodiment mainly consists of defatted cotton, molecular sieve and color-changing silica gel, which can effectively remove impurities and water in the sample gas. The outlet end of the drying pipe 5 is connected with one inlet end of the three-way switch valve 6 through the connecting pipe 8. The three-way switch valve 6 can realize the back and forth switching of the sample gas flow and the measurement instrument calibration. The outlet end of the three-way switch valve 6 is connected with one inlet end of the four-way switch valve 7 through the connecting pipe 8. The trace oxygen analyzer 10 is installed at the lower right corner of the installation panel 1. The inlet end of the trace oxygen analyzer 10 is connected with one outlet end of the four-way switch valve 7 through the connecting pipe 8, so that the sample gas in the connecting pipe 8 can enter into the trace oxygen analyzer 10 through the four-way switch valve 7. The trace oxygen analyzer 10 can analyze and detect the trace oxygen contained in the sample gas. The outlet end of the trace oxygen analyzer 10 is connected with the other inlet end of the four-way switch valve 7 through the connecting pipe 8. The other outlet end of the four-way switch valve 7 is connected with the exhaust pipe 11. The outlet end of the exhaust pipe 11 is connected with the external sample gas collection pipeline. After the trace oxygen analyzer 10 completes the detection of the sample gas, the sample gas can enter into the exhaust pipe 11 through the four-way switch valve 7, and is discharged from the detection device into the external sample gas collection pipeline. The four-way switch valve 7 in the embodiment can be used for the back and forth switching of the "sample inlet" and "emptying" states of the trace oxygen analyzer 10. When the four-way switch valve 7 is switched to the "sample inlet" state, the trace oxygen analyzer 10 can normally sample and measure. When the four-way switch valve 7 is switched to the "emptying" state, the sample can be emptied, so as to protect and prolong the service life of the trace oxygen analyzer 10.

[0022] The dew point analyzer 12 is installed on the installation panel 1 above the pressure reducing valve 4 and the drying pipe 5. The inlet end of the dew point analyzer 12 is connected with the connecting pipe 8 between the pressure reducing valve 4 and the drying pipe 5, so that part of the sample gas flowing out of the pressure reducing valve 4 enters into the drying pipe 5 through the connecting pipe 8, and the other part of the sample gas enters into the dew point analyzer 12 through the connecting pipe 8, so as to detect the dew point of the sample gas. The outlet end of the dew point analyzer 12 is connected with the exhaust pipe 11 through the connecting pipe 8, so that the sample gas after completing the dew point detection enters into the exhaust pipe 11 through the connecting pipe 8, and is discharged from the detection device. In the embodiment, the trace oxygen analyzer 10 and the dew point analyzer 12 are integrated on the same sampling pretreatment installation panel 1, which not only reduces the overall volume of the detection device and reduces the maintenance cost, but also greatly shortens the measurement period.

[0023] Further, the outlet end of the pressure reducing valve 4 is provided with the pressure gauge 13.

[0024] The pressure gauge 13 is installed at the outlet end of the pressure reducing valve 4 to monitor the pressure of the sample gas after pressure reduction to meet the normal use requirements of the analyzer.

[0025] Further, the first flow meter 14 is installed at the end of the exhaust pipe 11 close to the four-way switching valve 7.

[0026] In this embodiment, the first flow meter 14 is installed at the end of the exhaust pipe 11 close to the outlet end of the four-way switching valve 7 to monitor the sample flow entering the micro-oxygen analyzer 10 through the first flow meter 14, and the sample flow through the micro-oxygen analyzer 10 can be adjusted by the needle valve on the first flow meter 14 to make the flow of the micro-oxygen analyzer 10 be 0.5L / min, thereby meeting the use requirements of the micro-oxygen analyzer 10.

[0027] Further, the second flow meter 15 is installed at the outlet end of the dew point analyzer 12.

[0028] In this embodiment, the second flow meter 15 is installed at the outlet end of the dew point analyzer 12 to monitor the sample flow entering the dew point analyzer 12 through the second flow meter 15, and the sample flow through the dew point analyzer 12 can be adjusted by the needle valve on the second flow meter 15 to make the flow of the dew point analyzer 12 be 3L / min, thereby meeting the use requirements of the dew point analyzer 12.

[0029] Further, the flame arrester 16 is installed at the tail end of the exhaust pipe 11.

[0030] In this embodiment, the flame arrester 16 is installed at the tail end of the exhaust pipe 11 to prevent the flame of flammable gas and flammable liquid vapor from spreading, which serves as a safety device and plays a certain protective role.

[0031] Further, the calibration port 17 is installed on the three-way switching valve 6.

[0032] In this embodiment, the calibration port 17 is installed on the other inlet end of the three-way switching valve 6 to calibrate the detection device and improve the detection precision. Specifically, the standard gas with a corresponding range can be customized and purchased according to the range of different instruments, the standard gas is connected with the calibration port 17, the three-way switching valve 6 is switched to the calibrated position, and the calibration work is carried out.

[0033] In use, first, according to the range of the dew point analyzer 12 and the trace oxygen analyzer 10, the corresponding standard gas is introduced into the calibration port 17 to calibrate the dew point analyzer 12 and the trace oxygen analyzer 10. After the calibration is completed, the purified hydrogen in the purification process is transported into the sampling ball valve 2 through the sampling pipeline and the gas inlet pipe 9. The sampling ball valve 2 is opened, the sample gas enters the filter 3 through the connecting pipe 8, the sample gas is filtered, the filtered sample gas enters the pressure reducing valve 4 through the connecting pipe 8, the pressure of the sample gas is adjusted to meet the use pressure of the trace oxygen analyzer 10 and the dew point analyzer 12. After the pressure adjustment is completed, part of the sample gas flows into the drying pipe 5 through the connecting pipe 8, the sample gas is dried and impurities are removed, then enters the three-way switch valve 6 through the connecting pipe 8, enters the four-way switch valve 7 through the connecting pipe 8, then enters the trace oxygen analyzer 10 through the four-way switch valve 7, detects the trace oxygen content in the sample gas, and then flows through the first flow meter adjustment and enters the exhaust pipe 11 through the four-way switch valve 7. The last part of the sample gas enters the dew point analyzer 12 through the connecting pipe 8, detects the dew point of the sample gas, then enters the exhaust pipe 11 through the second flow meter 15, and finally flows into the flame arrester 16 and is discharged to the external collection pipeline.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application. They should be covered in the scope of the claims of the present application.

Claims

1. An on-line detection device for hydrogen and purified gas, characterized in that: The device comprises a mounting panel (1), a sampling ball valve (2), a filter (3), a pressure reducing valve (4), a drying tube (5), a three-way switching valve (6), a four-way switching valve (7), a connecting tube (8), an air inlet tube (9), a trace oxygen analyzer (10), an exhaust tube (11) and a dew point analyzer (12), the sampling ball valve (2), the filter (3), the pressure reducing valve (4), the drying tube (5), the three-way switching valve (6) and the four-way switching valve (7) are sequentially arranged on the mounting panel (1) in a straight line, the sampling ball valve (2), the filter (3), the pressure reducing valve (4), the drying tube (5), the three-way switching valve (6) and the four-way switching valve (7) are sequentially connected through the connecting tube (8), the inlet end of the sampling ball valve (2) is connected with an external sampling pipeline through the air inlet tube (9), the trace oxygen analyzer (10) is arranged on the mounting panel (1), the trace oxygen analyzer (10) is connected with the four-way switching valve (7) through the connecting tube (8), and is used for trace oxygen detection of the purified hydrogen, the four-way switching valve (7) is connected with an external collecting pipeline through the exhaust tube (11), the dew point analyzer (12) is arranged on the mounting panel (1), the inlet end of the dew point analyzer (12) is connected with the connecting tube (8) between the pressure reducing valve (4) and the drying tube (5), and is used for dew point detection of the purified hydrogen, and the outlet end of the dew point analyzer (12) is connected with the exhaust tube (11) through the connecting tube (8). ​ 2. The apparatus for on-line detection of hydrogen and purified gas according to claim 1, characterized in that: The outlet end of the pressure reducing valve (4) is provided with a pressure gauge (13).

3. The apparatus for on-line detection of hydrogen and purified gas according to claim 1, characterized in that: The exhaust tube (11) is provided with a first flowmeter (14) at one end close to the four-way switching valve (7).

4. The apparatus for on-line detection of hydrogen and purified gas according to claim 1, characterized in that: The outlet end of the dew point analyzer (12) is provided with a second flowmeter (15).

5. The apparatus for on-line detection of hydrogen and purified gas according to claim 1, characterized in that: The tail end of the exhaust tube (11) is provided with a flame arrester (16).

6. The apparatus for on-line detection of hydrogen and purified gas according to claim 1, characterized in that: The three-way switching valve (6) is provided with a calibration port (17).

Images