System for measuring trace hydrogen chloride in hydrogen

Abstract

The utility model provides a system for measuring trace hydrogen chloride in hydrogen, the system comprises a drainage module, an absorption module and an analysis module, the drainage module can stably lead out the hydrogen to be detected from a main pipeline, the sampling is accurately controlled, and the accuracy and safety of the sampling are ensured; the absorption module can rapidly absorb hydrogen chloride in hydrogen to form liquid to be detected, the absorption process is stable and reliable, and the accuracy of subsequent analysis is ensured; the analysis module comprises a standard liquid storage unit and an ion chromatography unit, the formed to-be-detected liquid and standard liquid can be accurately analyzed, the ion chromatography unit can accurately measure the concentration of trace hydrogen chloride, and the reliability and accuracy of a detection result are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of analytical detection technology, and in particular to a system for determining trace hydrogen chloride in hydrogen. BACKGROUND

[0002] In a hydrogen-oil combined workshop, a large amount of hydrogen is usually required. However, the hydrogen used contains impurities such as methane, ethane, ethylene, hydrogen chloride, etc. The hydrogen chloride impurities may corrode the equipment, reduce the activity of the catalyst, and even affect the quality of the final product. Therefore, it is necessary to regularly detect the purity of the hydrogen and the content of hydrogen chloride impurities to ensure that the requirements of the production process are met. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the above technical problems, the present application provides a system for determining trace hydrogen chloride in hydrogen, comprising a drainage module, an absorption module and an analysis module connected in sequence.

[0004] The drainage module comprises a pressure reducing valve and a manual valve, one end of the pressure reducing valve is connected with a hydrogen pipeline, and the other end is connected with the manual valve.

[0005] The absorption module comprises an absorption bottle, a mass flow meter, a first normally closed valve, a first exhaust unit, a liquid discharge unit, a cleaning unit and a drying unit. One end of the first normally closed valve is connected with the drainage module, and the other end is connected with the mass flow meter. The other end of the mass flow meter is connected with the absorption bottle. The first exhaust unit, the liquid discharge unit, the cleaning unit and the drying unit are all connected with the absorption bottle.

[0006] The analysis module comprises a solenoid valve, a standard liquid storage unit and an ion chromatography unit. One end of the solenoid valve is connected with the absorption bottle, and the other end is connected with the standard liquid storage unit and the ion chromatography unit respectively.

[0007] In some embodiments of the present application, the drainage module further comprises a first filter, which is arranged between the pressure reducing valve and the manual valve.

[0008] In some embodiments of the present application, the absorption module further comprises a second filter, which is arranged between the drainage module and the first normally closed valve.

[0009] In some embodiments of the present application, a second exhaust unit is further included. The second exhaust unit comprises a safety valve and a second check valve. One end of the safety valve is connected with one end of the first normally closed valve, and the other end is connected with the second check valve. One end of the second check valve is connected with the other end of the first normally closed valve, and the other end of the second check valve is connected with a normal pressure flare pipe.

[0010] In some embodiments of the present application, the first exhaust unit comprises a first check valve, one end of the first check valve is connected with the absorption bottle, and the other end is connected with the normal pressure flare pipe.

[0011] In some embodiments of the present application, the liquid discharge unit comprises a second normally closed valve, a first peristaltic pump, a stop valve and a waste liquid barrel, one end of the second normally closed valve is connected with the absorption bottle, and the other end is connected with one end of the first peristaltic pump, the other end of the first peristaltic pump is connected with one end of the stop valve, and the other end of the stop valve is connected with the waste liquid barrel.

[0012] In some embodiments of the present application, the cleaning unit comprises a third normally closed valve, a syringe pump and a cleaning liquid supply unit, one end of the third normally closed valve is connected with the absorption bottle, and the other end is connected with one end of the syringe pump, and the other end of the syringe pump is connected with the cleaning liquid supply unit.

[0013] In some embodiments of the present application, the drying unit comprises a fourth normally closed valve and instrument air, and two ends of the fourth normally closed valve are respectively connected with the absorption bottle and the instrument air.

[0014] In some embodiments of the present application, the ion chromatography unit comprises a six-way injection valve, a second peristaltic pump, an elution unit and an ion chromatograph, one end of the second peristaltic pump is connected with the electromagnetic valve, and the other end is connected with one end of the six-way injection valve, and the other end of the six-way injection valve is respectively connected with the elution unit and the ion chromatograph.

[0015] In some embodiments of the present application, the elution unit comprises a laminar pump and an elution liquid supply unit, and the laminar pump is arranged between the elution liquid supply unit and the six-way injection valve.

[0016] Compared with the prior art, the present application has the following advantages and beneficial effects: the system for measuring trace hydrogen chloride in hydrogen gas of the present application comprises a drainage module, an absorption module and an analysis module, the drainage module can stably guide the hydrogen gas to be detected from the main pipeline, accurately control sampling and ensure the accuracy and safety of sampling, the absorption module can quickly absorb the hydrogen chloride in the hydrogen gas to form a liquid to be detected, the absorption process is stable and reliable, and the accuracy of subsequent analysis is ensured, the analysis module comprises a standard solution storage unit and an ion chromatography unit, can accurately analyze the formed liquid to be detected and standard solution, the ion chromatography unit can accurately measure the concentration of trace hydrogen chloride, and the reliability and accuracy of the detection result are ensured.

[0017] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present application and together with the description, serve to explain the principles of the present application. In the drawings:

[0019] Figure 1 is a schematic diagram of a system for determining trace amounts of hydrogen chloride in hydrogen gas provided by an exemplary embodiment of the present application.

[0020] In the drawings:

[0021] 100, drainage module; 200, absorption module; 300, analysis module;

[0022] 101, pressure reducing valve; 102, first filter; 103, manual valve;

[0023] 201, absorption bottle; 202, mass flow meter; 203, first normally closed valve; 204, second filter; 205, second exhaust unit; 2051, safety valve; 2052, second check valve; 2053, normal pressure torch pipe; 206, first exhaust unit; 2061, first check valve; 207, liquid discharge unit; 2071, second normally closed valve; 2072, first peristaltic pump; 2073, stop valve; 2074, waste liquid barrel; 208, cleaning unit; 2081, third normally closed valve; 2082, syringe pump; 2083, cleaning liquid supply unit; 209, drying unit; 2091, instrument air; 2092, fourth normally closed valve;

[0024] 301, electromagnetic valve; 302, standard solution storage unit; 303, ion chromatography unit; 3031, second peristaltic pump; 3032, six-way injection valve; 3033, flow pump; 3034, eluent supply unit; 3035, ion chromatograph; 3036, binary selection valve; 3037, sulfuric acid solution supply unit. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other at will.

[0026] In a hydrogen-oil combined workshop, a large amount of hydrogen gas is usually required. However, the hydrogen gas used contains impurities such as methane, ethane, ethylene, hydrogen chloride, etc. The hydrogen chloride impurities may corrode the equipment, reduce the activity of the catalyst, and even affect the quality of the final product. Therefore, it is necessary to regularly detect the purity of hydrogen and the content of hydrogen chloride impurities to ensure that the requirements of the production process are met.

[0027] Based on this, the exemplary embodiments of the present application provide a system for determining trace hydrogen chloride in hydrogen gas, which comprises a flow guiding module, an absorption module and an analysis module. The flow guiding module can stably and efficiently guide the hydrogen gas to be detected from the main pipeline, accurately control the sampling and ensure the accuracy of the sampling. The absorption module can quickly and completely absorb the hydrogen chloride in the hydrogen gas to form a liquid to be detected, and the absorption process is stable and reliable, ensuring the accuracy of the subsequent analysis. The analysis module comprises a standard solution storage unit and an ion chromatography unit, which can accurately analyze the formed liquid to be detected and the standard solution. The ion chromatography unit can accurately determine the concentration of trace hydrogen chloride, ensuring the reliability and accuracy of the detection results.

[0028] An exemplary embodiment of the present application provides a system for determining trace hydrogen chloride in hydrogen gas, as shown in Figure 1 The system comprises a flow guiding module 100, an absorption module 200 and an analysis module 300 connected in sequence. The flow guiding module 100 comprises a pressure reducing valve 101 and a manual valve 103. One end of the pressure reducing valve 101 is connected with a hydrogen gas pipeline, and the other end is connected with the manual valve 103. The flow guiding module 100 can stably and efficiently guide the hydrogen gas to be detected from the main pipeline, accurately control the sampling and ensure the accuracy of the sampling. The absorption module 200 comprises an absorption bottle 201, a mass flow meter 202, a first normally closed valve 203, a first exhaust unit 206, a liquid discharge unit 207, a cleaning unit 208 and a drying unit 209. One end of the first normally closed valve 203 is connected with the flow guiding module 100, and the other end is connected with the mass flow meter 202. The other end of the mass flow meter 202 is connected with the absorption bottle 201. The first exhaust unit 206, the liquid discharge unit 207, the cleaning unit 208 and the drying unit 209 are all connected with the absorption bottle 201. The absorption module 200 can quickly and completely absorb the hydrogen chloride in the hydrogen gas to form a liquid to be detected, and the absorption process is stable and reliable, ensuring the accuracy of the subsequent analysis.

[0029] The analysis module 300 comprises an electromagnetic valve 301, a standard solution storage unit 302, and an ion chromatography unit 303. One end of the electromagnetic valve 301 is connected to the absorption bottle 201, and the other end is connected to the standard solution storage unit 302 and the ion chromatography unit 303, respectively. The electromagnetic valve 301 is preferably an electromagnetic ten-way valve. The analysis module 300 comprises the standard solution storage unit 302 and the ion chromatography unit 303. The ion chromatography unit 303 preferably adopts column suppression, which has high accuracy, so that the ion chromatography unit 303 can accurately analyze the formed to-be-detected liquid and standard solution, accurately determine the concentration of trace hydrogen chloride, and ensure the reliability and accuracy of the detection result.

[0030] For example, in order to remove impurity components in the to-be-detected gas, the flow guide module 100 further comprises a first filter 102, which is arranged between the pressure reducing valve 101 and the manual valve 103. In this way, the purified gas can be obtained, and the detection accuracy is improved. In order to further purify the to-be-detected gas, the absorption module 200 further comprises a second filter 204, which is arranged between the flow guide module 100 and the first normally closed valve 203.

[0031] The first exhaust unit 206 comprises a first check valve 2061, one end of which is connected to the absorption bottle 201, and the other end is connected to the atmospheric pressure torch pipe 2053. After the absorption bottle 201 completes the absorption of the to-be-detected gas, the remaining waste gas can be discharged into the atmospheric pressure torch pipe 2053 through the first exhaust unit 206, so as to reduce the pollution to the environment. In order to prevent the pressure in the system pipeline from being too high, the system further comprises a second exhaust unit 205; the second exhaust unit 205 comprises a safety valve 2051 and a second check valve 2052; one end of the safety valve 2051 is connected to one end of the first normally closed valve 203, and the other end is connected to the second check valve 2052; one end of the second check valve 2052 is connected to the other end of the first normally closed valve 203, and the other end of the second check valve 2052 is connected to the atmospheric pressure torch pipe 2053. When the pressure in the system pipeline exceeds the preset value, the safety valve 2051 and the second check valve 2052 are opened, and the gas enters the torch pipe from the safety valve 2051 and the second check valve 2052, so as to reduce the pressure in the system pipeline, and keep the pressure within the preset range.

[0032] In an embodiment, the liquid discharge unit 207 comprises a second normally closed valve 2071, a first peristaltic pump 2072, a stop valve 2073, and a waste liquid tank 2074; one end of the second normally closed valve 2071 is connected with the absorption bottle 201, and the other end is connected with one end of the first peristaltic pump 2072; the other end of the first peristaltic pump 2072 is connected with one end of the stop valve 2073; the other end of the stop valve 2073 is connected with the waste liquid tank 2074. The cleaning unit 208 comprises a third normally closed valve 2081, a syringe pump 2082, and a cleaning liquid supply unit 2083; one end of the third normally closed valve 2081 is connected with the absorption bottle 201, and the other end is connected with one end of the syringe pump 2082; the other end of the syringe pump 2082 is connected with the cleaning liquid supply unit 2083, and preferably, the cleaning liquid is ultrapure water. The cleaning unit 208 not only can provide liquid for absorption of the absorption bottle 201, but also can flush the absorption bottle 201 after completion of absorption and detection of the liquid to be detected. The drying unit 209 comprises a fourth normally closed valve 2092 and an instrument air 2091, and two ends of the fourth normally closed valve 2092 are connected with the absorption bottle 201 and the instrument air 2091 respectively, and preferably, the instrument air 2091 uses nitrogen. The gas introduced into the absorption bottle 201 can dry the absorption bottle 201. The liquid to be detected in the absorption bottle 201 can be discharged into the liquid discharge unit 207 after completion of sampling and detection, the cleaning unit 208 can flush the absorption bottle 201 once or multiple times, and the flushing liquid is also discharged into the liquid discharge unit 207. After completion of flushing, the gas can be introduced into the absorption bottle 201 through the drying unit 209 to dry the absorption bottle 201, so as to perform the next round of detection. In this way, there is no residue of the liquid to be detected in the last round, and the precision of the next round of detection is not affected.

[0033] For example, the ion chromatography unit 303 comprises a six-way injection valve 3032, a second peristaltic pump 3031, an eluent unit, and an ion chromatograph 3035; one end of the second peristaltic pump 3031 is connected with the electromagnetic valve 301, and the other end is connected with one end of the six-way injection valve 3032; the other end of the six-way injection valve 3032 is connected with the eluent unit and the ion chromatograph 3035 respectively. The eluent unit comprises a convection pump 3033 and an eluent supply unit 3034; the convection pump 3033 is arranged between the eluent supply unit 3034 and the six-way injection valve 3032. The ion chromatograph 3035 is also connected with the cleaning liquid supply unit 2083 and a sulfuric acid solution supply unit 3037 through a binary selection valve 3036. In this way, the ion chromatograph 3035 can be cleaned after completion of one round of detection.

[0034] In an embodiment, the venting unit further includes a fifth normally closed valve, one end of the fifth normally closed valve is connected with the absorption bottle 201, and the other end is connected with a venting pipeline, and a flame arrester is arranged at the end of the venting pipeline. In order to improve safety, a sixth normally closed valve is further arranged between the analysis module 300 and the absorption module 200.

[0035] The system for determining trace hydrogen chloride in hydrogen gas provided by the present application further includes a control system, which can control the operation of valves, pumps and the like, so as to control the diversion module 100, the absorption module 200 and the analysis module 300 to perform corresponding work, thereby realizing online sampling and measurement of hydrogen gas. The system does not need to transport the to-be-detected gas through a hydrogen cylinder or the like, thereby avoiding the risk of leakage that may occur during the transportation of the to-be-detected gas.

[0036] The working process of the system for determining trace hydrogen chloride in hydrogen gas provided by the present application is as follows: in the initial state, all valves are in the closed state, then the control system issues a sampling instruction, the fifth normally closed valve of the venting unit is opened, the third normally closed valve 2081 of the cleaning unit 208 is opened, the injection pump 2082 starts to work, and a preset amount of absorption liquid is injected into the absorption bottle 201, after a preset time, the third normally closed valve 2081 is closed, the injection pump 2082 stops working, and then the fifth normally closed valve of the venting unit is closed. At this time, the process of injecting the absorption liquid into the absorption bottle 201 is completed.

[0037] Then, the gas inlet process is started, the first check valve 2061 of the first exhaust unit 206 is opened, the first normally closed valve 203, the pressure reducing valve 101 and the manual valve 103 are opened, and a preset amount of to-be-detected hydrogen gas is introduced into the absorption bottle 201; after the gas inlet is completed, the first normally closed valve 203, the pressure reducing valve 101 and the manual valve 103 are closed, and then the first check valve 2061 is closed; at this time, the to-be-detected liquid is formed in the bottle; the fifth normally closed valve and the sixth normally closed valve are opened, the second peristaltic pump 3031 is started, and the ion chromatograph 3035 starts to work to detect the standard liquid and the to-be-detected liquid; after a preset time, the sixth normally closed valve is closed, the second normally closed valve 2071 is opened, and the first peristaltic pump 2072 starts to work to discharge the remaining waste liquid into the waste liquid barrel 2074, and after the waste liquid is discharged, the second normally closed valve 2071 and the first peristaltic pump 2072 are closed.

[0038] Finally, the first cleaning process is started, the third normally closed valve 2081 and the injection pump 2082 are opened, more than the amount of to-be-detected liquid is injected into the absorption bottle 201, and then the third normally closed valve 2081 and the injection pump 2082 are closed; the second normally closed valve 2071 and the first peristaltic pump 2072 are opened, the cleaned liquid is discharged into the waste liquid barrel 2074, and after the cleaned liquid is completely discharged, the third normally closed valve 2081 and the injection pump 2082 are closed.

[0039] After the second and third cleaning processes are performed respectively according to the above first cleaning process, the drying process is started, the fourth normally closed valve 2092 is opened, and gas is introduced into the absorption bottle 201. After the absorption bottle 201 is dried, the fourth normally closed valve 2092 and the fifth normally closed valve are closed.

[0040] In this application, the terms "comprise", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0041] Although preferred embodiments of the application have been described, those skilled in the art will be able to make additional modifications and variations without departing from the spirit and scope of the application. Accordingly, the appended claims are intended to encompass all such modifications and variations as falling within the scope of the application.

[0042] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application encompass all such modifications and changes as fall within the scope of the claims and their equivalents.

Claims

1. A system for determining trace amounts of hydrogen chloride in hydrogen gas, characterized by, The device comprises a drainage module, an absorption module and an analysis module connected in sequence. The drainage module comprises a pressure reducing valve and a manual valve, one end of the pressure reducing valve is connected with a hydrogen pipeline, and the other end is connected with the manual valve. The absorption module comprises an absorption bottle, a mass flow meter, a first normally closed valve, a first exhaust unit, a liquid discharge unit, a cleaning unit and a drying unit, one end of the first normally closed valve is connected with the drainage module, and the other end is connected with the mass flow meter, the other end of the mass flow meter is connected with the absorption bottle, and the first exhaust unit, the liquid discharge unit, the cleaning unit and the drying unit are all connected with the absorption bottle. The analysis module comprises a solenoid valve, a standard solution storage unit and an ion chromatography unit, one end of the solenoid valve is connected with the absorption bottle, and the other end is connected with the standard solution storage unit and the ion chromatography unit respectively.

2. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The drainage module further comprises a first filter, which is arranged between the pressure reducing valve and the manual valve.

3. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The absorption module further comprises a second filter, which is arranged between the drainage module and the first normally closed valve.

4. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The device further comprises a second exhaust unit, which comprises a safety valve and a second check valve, one end of the safety valve is connected with one end of the first normally closed valve, and the other end is connected with the second check valve, one end of the second check valve is connected with the other end of the first normally closed valve, and the other end of the second check valve is connected with a normal pressure flare pipeline.

5. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 4, characterized by, The first exhaust unit comprises a first check valve, one end of the first check valve is connected with the absorption bottle, and the other end is connected with a normal pressure flare pipeline.

6. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The liquid discharge unit comprises a second normally closed valve, a first peristaltic pump, a stop valve and a waste liquid tank, one end of the second normally closed valve is connected with the absorption bottle, and the other end is connected with one end of the first peristaltic pump, the other end of the first peristaltic pump is connected with one end of the stop valve, and the other end of the stop valve is connected with the waste liquid tank.

7. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The cleaning unit comprises a third normally closed valve, a syringe pump and a cleaning liquid supply unit, one end of the third normally closed valve is connected with the absorption bottle, and the other end is connected with one end of the syringe pump, and the other end of the syringe pump is connected with the cleaning liquid supply unit.

8. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The drying unit comprises a fourth normally closed valve and instrument air, and the fourth normally closed valve is connected with the absorption bottle and the instrument air respectively.

9. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 1, characterized by, The ion chromatography unit comprises a six-way injection valve, a second peristaltic pump, an elution unit and an ion chromatograph, one end of the second peristaltic pump is connected with the solenoid valve, and the other end is connected with one end of the six-way injection valve, and the other end of the six-way injection valve is connected with the elution unit and the ion chromatograph respectively.

10. The system for determining trace amounts of hydrogen chloride in hydrogen gas according to claim 9, characterized by, The elution unit comprises a laminar pump and an elution liquid supply unit, and the laminar pump is arranged between the elution liquid supply unit and the six-way injection valve.

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