Enrichment device for measuring trace impurities in hydrogen by gas chromatography

Abstract

The utility model relates to the technical field of hydrogen detection, in particular to an enrichment device for measuring trace impurities in hydrogen through a gas chromatographic method, which comprises a safety shell, a gas inlet pipe, a gas mass flowmeter, a six-way valve, a gas outlet pipe, an enrichment pipe and a heater. The hydrogen can be transmitted into the enrichment pipe through the six-way valve to be enriched, the enriched hydrogen is discharged through the gas outlet pipe, the impurity gas is left in the enrichment pipe, and then the impurity gas in the enrichment pipe is uniformly heated through the heater, so that the impurity gas can be separated from the enrichment pipe under the action of the gas in the gas carrying pipe. According to the present invention, the trace impurities in the hydrogen gas are conveyed into the gas chromatograph from the enrichment pipe, and the impurity gas is tested and analyzed, such that the accuracy of the analysis result of the trace impurities in the hydrogen gas is improved, and the technical problem that the accuracy of the analysis result of the trace impurities in the hydrogen gas is reduced due to the non-uniform heating of the impurity gas in the existing enrichment device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen detection, in particular to an enrichment device for determining trace impurities in hydrogen by gas chromatography. Background Technique

[0002] Gas chromatographs have different detection limits for different gas impurities in hydrogen. For example, for PH3, the FPD detector can reach 0.1×10 -6 (volume fraction), and for CH4 detected by FID, it is 0.1×10 -6 (volume fraction). For N2, O2, etc. in hydrogen detected by TCD, they are all above 1×10 -6 (volume fraction). When detecting trace gas impurities in existing hydrogen by a conventional gas chromatograph, it will be limited by the detection limit, thus unable to meet the detection requirements.

[0003] The prior art CN207601025U discloses an enrichment device for determining trace impurities in hydrogen by gas chromatography. By using a concentration column to adsorb some impurity gases with boiling point temperatures higher than the cold source under low-temperature conditions, the enrichment of gas impurities is achieved. The enriched gas is carried into the chromatograph by a carrier gas for detection, thereby further reducing the detection limit of the corresponding impurity detection, improving the automation efficiency, and at the same time, improving the accuracy of gas chromatography detection and analysis of impurity gases.

[0004] However, the heating contact area of the above enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube, thereby reducing the accuracy of the analysis results of trace impurities in hydrogen. Content of the Utility Model

[0005] The purpose of the utility model is to provide an enrichment device for determining trace impurities in hydrogen by gas chromatography, aiming to solve the technical problem that the heating contact area of the existing enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube, thereby reducing the accuracy of the analysis results of trace impurities in hydrogen.

[0006] To achieve the above object, the present utility model provides an enrichment device for determining trace impurities in hydrogen by gas chromatography, which includes a safety housing, and further includes an inlet pipe, a gas mass flowmeter, a six-way valve, an outlet pipe, an enrichment tube and a heater. The inlet pipe partially extends into the safety housing. The gas mass flowmeter is communicated with the inlet pipe and is located inside the safety housing. The six-way valve is communicated with the gas mass flowmeter, is located on the side of the gas mass flowmeter away from the inlet pipe, and is located inside the safety housing. The outlet pipe is communicated with the six-way valve and partially extends out of the safety housing. Two sides of the enrichment tube are respectively communicated with the six-way valve and are located inside the safety housing. The heater is arranged on the outer side of the enrichment tube and completely covers the enrichment tube.

[0007] Wherein, the inlet pipe is provided with a first valve, and the first valve is used to control the intake air volume of the inlet pipe.

[0008] Wherein, the outlet pipe is provided with a second valve, and the second valve is used to control the outlet air volume of the outlet pipe.

[0009] Wherein, a carrier gas pipe and a gas chromatograph are further connected at two adjacent valve ports on the six-way valve, and both the carrier gas pipe and the gas chromatograph extend out of the safety housing respectively.

[0010] Wherein, the enrichment device for determining trace impurities in hydrogen by gas chromatography further includes a protection component, and the protection component is used to protect the internal space of the safety housing.

[0011] Wherein, the protection component includes a protection cover, a hook and a fixing ring. The protection cover is arranged above the safety housing. The hook is arranged on the outer side of the protection cover. The fixing ring is detachably connected with the hook and is arranged on the side of the safety housing close to the hook.

[0012] Wherein, the protection cover includes a cover body and a sealing gasket. The cover body is movably connected with the safety housing and is located on the upper surface of the safety housing. The sealing gasket is arranged on the lower surface of the cover body.

[0013] An enrichment device for determining trace impurities in hydrogen by gas chromatography according to the present utility model. Hydrogen is transmitted through the inlet pipe to the six-way valve via the gas mass flowmeter, so that hydrogen can be transmitted to the enrichment tube through the six-way valve for enrichment. After enrichment, hydrogen is discharged through the outlet pipe, while the impurity gas is left in the enrichment tube. Then, the impurity gas in the enrichment tube is uniformly heated by the heater, so that the impurity gas can be transmitted from the enrichment tube to the gas chromatograph under the action of the gas in the carrier gas pipe for testing and analysis of the impurity gas, thereby improving the accuracy of the analysis result of trace impurities in hydrogen and solving the technical problem that the heating contact area of the existing enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube, thereby reducing the accuracy of the analysis result of trace impurities in hydrogen. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0015] Figure 1 It is a schematic structural diagram of the overall enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model.

[0016] Figure 2 It is a schematic cross-sectional view along the six-way valve of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model.

[0017] Figure 3 It is a schematic cross-sectional view along the enrichment tube of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model.

[0018] Figure 4 It is a schematic structural diagram of the protection component of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the second embodiment of the present utility model.

[0019] Figure 5 It is a schematic cross-sectional view along the hook of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the second embodiment of the present utility model.

[0020] In the figure: 101 - safety housing, 102 - inlet pipe, 103 - gas mass flowmeter, 104 - six-way valve, 105 - outlet pipe, 106 - enrichment tube, 107 - heater, 108 - carrier gas pipe, 109 - gas chromatograph, 110 - first valve, 111 - second valve, 201 - hook, 202 - fixing ring, 203 - cover body, 204 - sealing gasket. Detailed Embodiments

[0021] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0022] First Embodiment

[0023] Please refer to Figures 1 to 3 , Figure 1 , which is a schematic diagram of the overall structure of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model, Figure 2 is a schematic cross-sectional view of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model along the six-port valve 104, Figure 3 is a schematic cross-sectional view of the enrichment device for determining trace impurities in hydrogen by gas chromatography according to the first embodiment of the present utility model along the enrichment tube 106.

[0024] The present utility model provides an enrichment device for determining trace impurities in hydrogen by gas chromatography: including a safety housing 101, an inlet pipe 102, a gas mass flowmeter 103, a six-port valve 104, an outlet pipe 105, an enrichment tube 106, a heater 107, a carrier gas pipe 108, and a gas chromatograph 109. The inlet pipe 102 is provided with a first valve 110, and the outlet pipe 105 is provided with a second valve 111. By the foregoing solution, the technical problem that the heating contact area of the existing enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube 106, thereby reducing the accuracy of the analysis result of trace impurities in hydrogen is solved. It can be understood that the foregoing solution can be used in the scenario of determining different gas impurities in hydrogen.

[0025] In this embodiment, hydrogen is transmitted into the six-way valve 104 through the intake pipe 102 via the gas mass flowmeter 103, so that hydrogen can be transmitted into the enrichment tube 106 through the six-way valve 104 for enrichment. After enrichment, hydrogen is discharged through the outlet pipe 105, while the impurity gas is left in the enrichment tube 106. Then, the impurity gas in the enrichment tube 106 is uniformly heated by the heater 107, so that the impurity gas can be transmitted from the enrichment tube 106 into the gas chromatograph 109 under the action of the gas in the carrier gas pipe 108 for the test and analysis of the impurity gas, thereby improving the accuracy of the analysis result of trace impurities in hydrogen and solving the technical problem that the heating contact area of the existing enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube 106, thereby reducing the accuracy of the analysis result of trace impurities in hydrogen.

[0026] Among them, a part of the intake pipe 102 extends into the safety housing 101. The gas mass flowmeter 103 is communicated with the intake pipe 102 and is located inside the safety housing 101. The six-way valve 104 is communicated with the gas mass flowmeter 103, is located on a side of the gas mass flowmeter 103 away from the intake pipe 102, and is located inside the safety housing 101. The outlet pipe 105 is communicated with the six-way valve 104 and a part of it extends out of the safety housing 101. Two sides of the enrichment pipe 106 are respectively communicated with the six-way valve 104 and are located inside the safety housing 101. The heater 107 is arranged outside the enrichment pipe 106 and completely covers the enrichment pipe 106. The inside of the safety housing 101 is a hollow structure. The gas mass flowmeter 103, the six-way valve 104 and the enrichment pipe 106 are all arranged inside the safety housing 101. The intake pipe 102, the gas mass flowmeter 103, the six-way valve 104 and the outlet pipe 105 are communicated in sequence, so that hydrogen entering from the intake pipe 102 can enter the six-way valve 104 from the gas mass flowmeter 103, circulate in the six-way valve 104 and then be discharged from the outlet pipe 105. The six-way valve 104 has six valve ports. The valve ports connected to the gas mass flowmeter 103 and the outlet pipe 105 are arranged oppositely. The valve ports connected to two sides of the enrichment pipe 106 are also arranged oppositely, and the valve ports connected to two sides of the enrichment pipe 106 are respectively communicated with the valve port connected to the gas mass flowmeter 103 and the valve port connected to the outlet pipe 105, so that hydrogen entering the six-way valve 104 can be transmitted into the enrichment pipe 106, and further the hydrogen in the enrichment pipe 106 can be transmitted to the outlet pipe 105 and finally be discharged from the outlet pipe 105, while the impurity gas in the hydrogen is left in the enrichment pipe 106.

[0027] Secondly, the first valve 110 is used to control the intake air volume of the intake pipe 102. Open the first valve 110 to open the channel of the intake pipe 102, and the intake air volume of the intake pipe 102 can be controlled by controlling the opening and closing degree of the first valve 110.

[0028] Thirdly, the second valve 111 is used to control the outlet air volume of the outlet pipe 105. Open the second valve 111 to open the channel of the outlet pipe 105, and the outlet air volume of the outlet pipe 105 can be controlled by controlling the opening and closing degree of the second valve 111.

[0029] Finally, a carrier gas pipe 108 and a gas chromatograph 109 are also connected to two adjacent valve ports on the six-way valve 104. Both the carrier gas pipe 108 and the gas chromatograph 109 extend outside the safety housing 101 respectively. The impurity gas in the enrichment tube 106 can be transported from the enrichment tube 106 to the gas chromatograph 109 under the action of the gas in the carrier gas pipe 108 for testing and analysis of the impurity gas.

[0030] When using the present utility model, set the control flow rate of the gas mass flowmeter 103 to calculate the hydrogen during the enrichment process, so as to calculate the total volume of the impurity gas during the enrichment process. Then, open the first valve 110 and the second valve 111, so that the channels of the inlet pipe 102 and the outlet pipe 105 are opened, and hydrogen is transported into the inlet pipe 102. Thus, hydrogen can be transported through the inlet pipe 102 and the gas mass flowmeter 103 into the six-way valve 104, and then hydrogen can be transported through the six-way valve 104 into the enrichment tube 106 for enrichment. After enrichment, hydrogen is discharged through the outlet pipe 105, while the impurity gas is left in the enrichment tube 106. Then, rotate the six-way valve 104 and press the start button of the gas chromatograph 109 at the same time, so that the impurity gas in the enrichment tube 106 can be evenly heated by the heater 107. Furthermore, the impurity gas can be transported from the enrichment tube 106 to the gas chromatograph 109 under the action of the gas in the carrier gas pipe 108 for testing and analysis of the impurity gas.

[0031] In summary, hydrogen is transported through the inlet pipe 102 to the inside of the six-way valve 104 through the gas mass flowmeter 103, so that hydrogen can be transported through the six-way valve 104 into the enrichment tube 106 for enrichment. After enrichment, hydrogen is discharged through the outlet pipe 105, while the impurity gas is left in the enrichment tube 106. Then, the impurity gas in the enrichment tube 106 is evenly heated by the heater 107, so that the impurity gas can be transported from the enrichment tube 106 to the gas chromatograph 109 under the action of the gas in the carrier gas pipe 108 for testing and analysis of the impurity gas. Furthermore, the accuracy of the analysis result of trace impurities in hydrogen is improved, and the technical problem that the heating contact area of the existing enrichment device is small, resulting in uneven heating of the enriched impurity gas, so that some impurity gases will adhere to the enrichment tube 106, and further reducing the accuracy of the analysis result of trace impurities in hydrogen is solved.

[0032] Second Embodiment

[0033] Please refer to Figures 4 to 5 , Figure 4It is a schematic structural diagram of a protection component of an enrichment device for measuring trace impurities in hydrogen by gas chromatography according to the second embodiment of the present utility model. Figure 5 It is a schematic cross-sectional view along the hook 201 of an enrichment device for measuring trace impurities in hydrogen by gas chromatography according to the second embodiment of the present utility model. On the basis of the first embodiment, an enrichment device for measuring trace impurities in hydrogen by gas chromatography of the present utility model further includes a protection component, and the protection component includes a protection cover, a hook 201 and a fixing ring 202. The protection cover includes a cover body 203 and a sealing gasket 204.

[0034] The protection component is located above the safety housing 101. By providing the protection component, the internal space of the safety housing 101 can be protected by the protection component.

[0035] The protection cover is arranged above the safety housing 101. The hook 201 is arranged on the outer side of the protection cover. The fixing ring 202 is detachably connected to the hook 201 and is arranged on one side of the safety housing 101 close to the hook 201. The protection cover can rotate above the safety housing 101, so that the protection cover can open or close the internal space of the safety housing 101. The hook 201 can be bent, so that the hook 201 can be buckled on the fixing ring 202, and further the position of the protection cover above the safety housing 101 is limited and fixed.

[0036] The cover body 203 is movably connected to the safety housing 101 and is located on the upper surface of the safety housing 101. The sealing gasket 204 is arranged on the lower surface of the cover body 203. The material of the sealing gasket 204 is a flexible soft material. The sealing gasket 204 is in interference fit with the safety housing 101 and is fixedly arranged below the cover body 203, so that the sealing gasket 204 can seal the gap between the safety housing 101 and the cover body 203 to prevent external dust and other impurities from entering the safety housing 101 through the gap between the safety housing 101 and the cover body 203.

[0037] When measuring the impurity gas in hydrogen, rotate the cover body 203 outside the safety housing 101. When the cover body 203 completely covers the internal space of the safety housing 101, buckle the hook 201 on the fixing ring 202, so that the position of the protection cover above the safety housing 101 is limited and fixed, which is convenient for measuring the impurity gas in hydrogen. At this time, the sealing gasket 204 can seal the gap between the safety housing 101 and the cover body 203 to prevent external dust and other impurities from entering the safety housing 101 through the gap between the safety housing 101 and the cover body 203.

[0038] When a fault occurs in the electrical components within the security enclosure 101, remove the hook 201 from the fixed ring 202, so as to release the fixed state of the protective cover above the security enclosure 101. Thereafter, rotate the cover body 203 outside the security enclosure 101. After the internal space of the security enclosure 101 is completely exposed by the cover body 203, the faulty electrical components within the security enclosure 101 can be maintained.

[0039] The above-disclosed is only a preferred embodiment of the present utility model. Of course, the scope of rights of the present utility model cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present utility model still fall within the scope covered by the utility model.

Claims

1. An enrichment device for determining trace impurities in hydrogen by gas chromatography, comprising a safety housing, characterized in that, it further comprises an inlet pipe, a gas mass flowmeter, a six-way valve, an outlet pipe, an enrichment pipe and a heater. The inlet pipe partially extends into the safety housing. The gas mass flowmeter is connected to the inlet pipe and is located inside the safety housing. The six-way valve is connected to the gas mass flowmeter and is located on the side of the gas mass flowmeter away from the inlet pipe and inside the safety housing. The outlet pipe is connected to the six-way valve and partially extends outside the safety housing. Two sides of the enrichment pipe are respectively connected to the six-way valve and are located inside the safety housing. The heater is arranged outside the enrichment pipe and completely covers the enrichment pipe.

2. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 1, characterized in that, the inlet pipe has a first valve, and the first valve is used to control the intake air volume of the inlet pipe.

3. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 1, characterized in that, the outlet pipe has a second valve, and the second valve is used to control the outlet air volume of the outlet pipe.

4. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 1, characterized in that, a carrier gas pipe and a gas chromatograph are further connected at two adjacent valve ports on the six-way valve, and both the carrier gas pipe and the gas chromatograph extend outside the safety housing respectively.

5. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 1, characterized in that, the enrichment device for determining trace impurities in hydrogen by gas chromatography further comprises a protection component, and the protection component is used to protect the internal space of the safety housing.

6. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 5, characterized in that, the protection component comprises a protection cover, a hook and a fixing ring. The protection cover is arranged above the safety housing. The hook is arranged outside the protection cover. The fixing ring is detachably connected to the hook and is arranged on the side of the safety housing close to the hook.

7. The enrichment device for determining trace impurities in hydrogen by gas chromatography according to claim 6, characterized in that, the protection cover comprises a cover body and a sealing gasket. The cover body is movably connected to the safety housing and is located on the upper surface of the safety housing. The sealing gasket is arranged on the lower surface of the cover body.

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