Method, program and system for measuring hydrogen sulfide gas in hydrogen gas

Abstract

To provide a hydrogen sulfide gas measuring method or the like allowing accurate measurement of hydrogen sulfide gas that is an impurity in hydrogen gas.SOLUTION: There is provided a hydrogen sulfide gas measuring method using a hydrogen sulfide gas measuring system that measures hydrogen sulfide gas in hydrogen gas. The hydrogen sulfide gas measuring system includes a channel through which the hydrogen gas flows, a flow rate control unit that controls the speed of the gas flowing through the channel, and a detection cell that detects the hydrogen sulfide gas included in the hydrogen gas. The hydrogen sulfide gas measuring method includes: a hydrogen sulfide attachment step of introducing, by the flow rate control unit, the hydrogen sulfide gas into the channel to attach the hydrogen sulfide gas to the channel; a collection step of collecting the hydrogen gas; and a measurement step of measuring the hydrogen gas.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method, a program, and a system for measuring hydrogen sulfide gas contained in hydrogen gas. [Background technology]

[0002] In recent years, there has been an increasing need to provide high-quality hydrogen gas in order to put fuel cells into practical use. The inventors of the present application have developed fuel cell protection devices, temperature and humidity control devices, fluid transfer devices, and the like (Patent Documents 1 to 3).

[0003] Also, a gas chromatography device that continuously analyzes a sample gas by gas chromatography is known (Patent Document 4). Furthermore, a sensor cell that monitors various impurities in fuel hydrogen using a hydrogen pump type sensor cell is known (Patent Document 5). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-092786 A [Patent Document 2] Patent No. 6684491 [Patent Document 3] JP 2014-177892 A [Patent Document 4] JP 2002-181798 A [Patent Document 5] Patent No. 5597004 Summary of the Invention [Problem to be solved by the invention]

[0005] However, no hydrogen sulfide gas measurement method or system is known that can continuously measure hydrogen sulfide gas, which is one of the impurities in hydrogen gas, online with high accuracy.

[0006] Therefore, an object of the present invention is to provide a hydrogen sulfide gas measurement method and the like that enables hydrogen sulfide gas, which is an impurity in hydrogen gas, to be measured with high accuracy. [Means for solving the problem]

[0007] A first aspect of the present invention is a hydrogen sulfide gas measurement method using a hydrogen sulfide gas measurement system that measures hydrogen sulfide gas in hydrogen gas, the hydrogen sulfide gas measurement system comprising a flow path through which the hydrogen gas flows, a flow rate control unit that controls the speed at which the gas flows through the flow path, and a detection cell that detects hydrogen sulfide gas contained in the hydrogen gas, the hydrogen sulfide gas measurement method including a hydrogen sulfide attachment step in which the flow rate control unit introduces hydrogen sulfide gas into the flow path and attaches the hydrogen sulfide gas to the flow path, a collection step in which the hydrogen gas is collected, and a measurement step in which the hydrogen gas is measured.

[0008] A second aspect of the present invention is the hydrogen sulfide gas measurement method according to the first aspect, wherein in the hydrogen sulfide adhering step, hydrogen sulfide gas is allowed to adhere to the flow path until a saturated state is reached.

[0009] A third aspect of the present invention is a hydrogen sulfide gas measurement method according to the first or second aspect, wherein the hydrogen sulfide gas measurement system further comprises a hydrogen sulfide gas cylinder containing calibrated hydrogen sulfide gas, and in the hydrogen sulfide adhesion step, the calibrated hydrogen sulfide gas is supplied from the hydrogen sulfide gas cylinder to the flow path.

[0010] A fourth aspect of the present invention is a hydrogen sulfide gas measurement method according to any one of the first to third aspects, wherein the hydrogen sulfide gas measurement system further comprises a zero gas cylinder containing zero gas from which impurities have been removed in advance, and further comprises a purging step of supplying the zero gas from the zero gas cylinder to the flow path prior to the collection step.

[0011] A fifth aspect of the present invention is a hydrogen sulfide gas measurement method according to any one of the first to fourth aspects, wherein the measurement target gas is hydrogen gas, and the hydrogen sulfide gas measurement system further includes a gas separation unit that separates at least carbon monoxide and hydrogen sulfide, and further includes a carbon monoxide removal step, prior to the measurement step, in which the gas separation unit separates carbon monoxide contained in the hydrogen gas and removes it from the hydrogen gas.

[0012] A sixth aspect of the present invention is a program for causing a computer to function as the flow rate control unit according to any one of the first to fifth aspects.

[0013] A seventh aspect of the present invention is a hydrogen sulfide gas measurement system for measuring hydrogen sulfide gas in hydrogen gas, comprising a flow path through which the hydrogen gas flows, a hydrogen sulfide gas cylinder containing hydrogen sulfide gas, a flow rate control unit for controlling the speed at which the gas flows through the flow path, and a detection cell for detecting hydrogen sulfide gas contained in the hydrogen gas, wherein the hydrogen sulfide gas cylinder is connected to the flow path via a control valve.

[0014] An eighth aspect of the present invention is the hydrogen sulfide gas measurement system according to the seventh aspect, wherein the hydrogen sulfide gas cylinder contains calibrated hydrogen sulfide gas.

[0015] A ninth aspect of the present invention is the hydrogen sulfide gas measurement system according to the seventh or eighth aspect, further comprising a gas separation section that separates at least carbon monoxide and hydrogen sulfide.

[0016] The present invention may also be understood as an analysis method, program, and analysis system for continuously and online analyzing the presence or absence and amount of hydrogen sulfide gas contained in a gas to be measured. Effect of the Invention

[0017] According to each aspect of the present invention, it becomes possible to continuously measure hydrogen sulfide gas contained in hydrogen gas online with good reactivity and high accuracy.

[0018] The inventors of the present invention considered that one of the reasons why it is difficult to measure hydrogen sulfide gas with high accuracy is poor measurement responsiveness. Measurement methods with poor responsiveness are not suitable for practical use. Furthermore, they identified that the cause of the poor responsiveness is that hydrogen sulfide adheres to parts of the stainless steel piping and does not reach the sensor cell.

[0019] Furthermore, the present inventors have come up with the unique technical idea that by intentionally attaching hydrogen sulfide to the entire flow path, it is possible to improve the measurement accuracy of hydrogen sulfide.

[0020] In particular, according to the second aspect of the present invention, by maximally adhering hydrogen sulfide to the entire flow path, it becomes easy to measure the hydrogen sulfide contained in the hydrogen gas that subsequently flows through the flow path with good reactivity and high accuracy.

[0021] Furthermore, according to the third or eighth aspect of the present invention, by attaching calibrated hydrogen sulfide, it becomes easy to reliably attach a maximum amount of hydrogen sulfide in each cycle, which makes it easier to measure hydrogen sulfide contained in hydrogen gas with high accuracy.

[0022] Furthermore, according to the fourth aspect of the present invention, it is possible to prepare the same environment before and after measurement, including by attaching hydrogen sulfide to the entire flow path, which makes it easy to repeatedly perform stable, highly reactive, and highly accurate measurements.

[0023] Furthermore, according to the fifth or ninth aspect of the present invention, impurities other than hydrogen sulfide gas contained in hydrogen gas can be removed in advance, making it easier to measure hydrogen sulfide contained in hydrogen gas with high accuracy. [Brief description of the drawings]

[0024] [Figure 1] 1 is a block diagram showing an overview of a hydrogen sulfide gas measurement system according to an embodiment of the present invention. FIG. [Diagram 2] 1 is a system configuration diagram showing an example of an overview of a hydrogen sulfide gas measurement system according to an embodiment of the present invention. FIG. [Diagram 3] 1 is a diagram showing an example of an outline of a hydrogen sulfide gas measuring device according to an embodiment of the present invention; [Figure 4] FIG. 1 is a flow chart showing an example of an outline of a measurement process flow in a hydrogen sulfide gas measuring method according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a flow diagram showing an example of an operation flow of a hydrogen sulfide gas measuring device in a hydrogen sulfide gas measuring method according to an embodiment of the present invention. [Figure 6] 1 is a graph showing an example of changes over time in the concentration of hydrogen sulfide gas impurity in hydrogen gas actually analyzed by the hydrogen sulfide gas measurement system according to the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the embodiment of the present invention is not limited to the contents described below. In addition, when there are multiple devices or components of the same type, they may be collectively described without the subscripts.

[0026] First, the difficulties in measuring hydrogen sulfide gas that the present inventors have found will be described. Hydrogen sulfide gas has the property of being adsorbed by stainless steel. If the inside of the pipe is glass coated, adsorption is less likely, but joints and the like are often made of stainless steel, so hydrogen sulfide is adsorbed. For this reason, even if hydrogen sulfide gas is mixed into the gas to be measured, detection is delayed. Even if hydrogen sulfide gas is detected, it is difficult to measure the concentration of hydrogen sulfide with high accuracy.

[0027] Figure 1 is an example of a graph showing the difficulty of measuring hydrogen sulfide. The vertical axis shows hydrogen sulfide concentration [ppb], and the horizontal axis shows elapsed time. Figure 1 shows that the detected hydrogen sulfide concentration is not stable even 12 hours after starting to mix a certain concentration of hydrogen sulfide gas into hydrogen gas. If it takes such a long time to measure hydrogen sulfide concentration, it is an inappropriate measurement method.

[0028] Hereinafter, a hydrogen sulfide gas measurement system and a hydrogen sulfide gas measurement method invented by the present inventor for measuring the hydrogen sulfide concentration in a gas to be measured with good sensitivity and high accuracy will be described. EXAMPLES

[0029] FIG. 2 is a diagram showing an example of the outline of a hydrogen sulfide gas measurement system (an example of a "hydrogen sulfide gas measurement system" in the claims) according to this embodiment. The hydrogen sulfide gas measurement system 1 includes a hydrogen sulfide gas measurement device panel 3 and a gas supply unit 5. The hydrogen sulfide gas measurement device panel 3 includes a hydrogen sulfide gas measurement device 7, a fuel gas flow path 91 (an example of a "flow path" in the claims), a zero gas flow path 92, a hydrogen sulfide flow path 93, a control valve 11, a backflow valve 13, and a connection point 15. The gas supply unit 5 includes a zero gas cylinder 17 (an example of a "zero gas cylinder" in the claims), a backup cylinder 19, a hydrogen sulfide gas cylinder 21, and a connection point 23.

[0030] The hydrogen sulfide gas measuring device panel 3 is a metal container in which the main devices of the hydrogen sulfide gas measuring system 1 other than various cylinders are packaged so that they can be installed outdoors. A plurality of flow paths 9 are connected to the hydrogen sulfide gas measuring device 7. The flow paths 9 include a fuel gas flow path 91 through which hydrogen fuel gas to be measured (an example of the "gas to be measured" in the claims of the present application) is supplied, a zero gas flow path 92 through which industrial hydrogen gas from which impurities have been removed in advance as zero gas (an example of the "zero gas" in the claims of the present application) is supplied, and a hydrogen sulfide flow path 93 through which calibrated hydrogen sulfide gas is supplied. The hydrogen fuel supply flow path 33 connected to an external hydrogen fuel supply device 31 branches at a connection point 35 located midway. The branched flow paths are connected to the fuel gas flow path 91 at a connection point 151 via a control valve 111 and a check valve 131. The fuel gas flow path 91 is connected to the zero gas flow path 92 at a connection point 152.

[0031] The gas supply unit 5 supplies various gases to the hydrogen sulfide gas measuring device. The zero gas cylinder 17 and the backup cylinder 19 of the gas supply unit 5 contain industrial hydrogen gas from which impurities have been removed in advance as zero gas. The hydrogen sulfide gas cylinder 21 contains calibrated hydrogen sulfide gas. In this embodiment, the hydrogen sulfide gas cylinder 21 contains 10 L of hydrogen sulfide at 1.5 ppm. The zero gas cylinder 17 is connected to the fuel gas flow path 91 via a gate valve, a control valve 112, a connection point 152, a check valve 132, and a connection point 151 in this order. The backup cylinder 19 is connected to a flow path connected to the zero gas cylinder 17 at the connection point 23 via a gate valve. The hydrogen sulfide gas cylinder 21 is connected to the hydrogen sulfide flow path 93 via a gate valve.

[0032] The hydrogen sulfide gas measurement system 1 samples and measures a portion of the hydrogen fuel gas supplied from an external hydrogen fuel supply device 31 at 0.2 to 0.8 MPa as a measurement target gas. The hydrogen sulfide gas measurement device 7 measures the concentration of hydrogen sulfide contained in the supplied hydrogen fuel gas. The hydrogen sulfide gas measurement device 7 can communicate with an external computer 37. The hydrogen sulfide gas measurement device 7 can be controlled by the computer 37, and the measurement results can be displayed on the computer 37. The flow path 9 is a flow path for various gases. The adjustment valve 11 adjusts the flow rate of the gas flowing through the flow path. The adjustment valve 111 adjusts the flow rate of the sampled hydrogen fuel gas to 0.20 MPa. The adjustment valve 112 adjusts the flow rate of the zero gas supplied from the zero gas cylinder 17 and / or the backup cylinder 19 to 0.15 MPa.

[0033] FIG. 3 is a block diagram showing an outline of a hydrogen sulfide gas measurement system 1 according to the present embodiment. Referring to FIG. 3, the hydrogen sulfide gas measurement system 1 includes a gas supply unit 5, a hydrogen sulfide gas measurement device 7, a flow path 9, a valve unit 10, a column 25 (an example of a "gas separation unit" in the present claims), a conversion unit 27, a display unit 29, and a control unit 51. The gas supply unit 5 includes a zero gas cylinder 17, a backup gas cylinder 19, and a hydrogen sulfide gas cylinder 21. The hydrogen sulfide gas measurement device 7 includes a solenoid valve 71, a flow controller 73, a distilled water tank 74, and a measurement unit 75. The measurement unit 75 includes a sensor cell 77 (an example of a "detection cell" in the present claims), a power source 79, a voltmeter 81, a temperature and humidity sensor 83, and a humidification pot 85. The control unit 51 includes a valve control unit 53, a flow rate control unit 55 (one example of the “flow rate control unit” in the claims), a power supply control unit 57, and a display control unit 59.

[0034] The solenoid valve 71 is a two-way or three-way solenoid valve, and can switch the direction of gas flow or open / close by turning it ON and OFF. The flow controller 73 adjusts the flow rate of gas at a specific point in the flow path 9. The distilled water tank 74 holds distilled water to be supplied to the humidification pot 85. The measurement unit 75 measures the concentration of impurities contained in the supplied gas.

[0035] In the measurement unit 75, the sensor cell 77 is a hydrogen pump type sensor cell. The resistance value of the sensor cell 77 changes depending on the impurity concentration. The sensor cell 77 has the property of reacting with high sensitivity when hydrogen sulfide in hydrogen adheres to it, and quickly peeling off the hydrogen sulfide when the hydrogen sulfide decreases. The power source 79 supplies a current to the sensor cell 77. The voltmeter 81 measures the voltage of the sensor cell 77. The temperature and humidity sensor 83 measures the temperature and humidity of the measurement unit 75. The humidification pot 85 humidifies the gas supplied to the sensor cell 77.

[0036] The valve 10 has valves such as a gate valve, a control valve, and a check valve, and controls the movement of gas in the hydrogen sulfide gas measurement system 1. The column 25 separates impurities contained in the hydrogen gas. In particular, in this embodiment, the column 25 is used to separate and remove carbon monoxide from the hydrogen gas. Since the sensor cell 77 reacts not only to hydrogen sulfide but also to carbon monoxide, removing carbon monoxide with the column 25 makes it easier to improve the detection accuracy of hydrogen sulfide.

[0037] Conversion unit 27 converts the change in the measured voltage detected by voltmeter 81 into the hydrogen sulfide concentration. Display unit 29 displays the converted hydrogen sulfide concentration.

[0038] In the control unit 51, the valve control unit 53 controls the flow direction, adjustment amount, and opening and closing of various valves in the valve unit 10. The flow rate control unit 55 controls the flow controller 73 to control the flow rate at a predetermined location. The power supply control unit 57 controls the power supply 79. The display control unit 59 controls the display unit 29.

[0039] 4 is a diagram showing an example of the configuration of a hydrogen sulfide gas measurement system 1 according to this embodiment. Hereinafter, for the three-way solenoid valves SV1 to SV5 among the solenoid valves SV, the input valve is written as "IN", the output valve that is open when OFF is written as "NO", and the output valve that is open when ON is written as "NC". Also, the solenoid valve SV may be written simply as "SV". SV6 is a two-way solenoid valve.

[0040] In Fig. 4, an external hydrogen fuel supply device 31 that supplies hydrogen gas, which is the gas to be measured, is connected to the hydrogen fuel supply flow path 33, gate valve V4, control valve R4, check valve G1, connection point C1, main valve V1, control valve R1, connection point C2, the IN valve of SV2, the NO valve, and connection point C3, in that order, via the NC valve of SV3. The NC valve of SV1 and the NC valve of SV2 are also connected. The check valve G2 prevents gas from flowing from connection point C1 in the direction of the hydrogen fuel supply device 31.

[0041] The zero gas cylinder 17 is connected to the measurement unit 75 via the connection point C4, the gate valve V5, the control valve R5, the connection point C5, the control valve R2, the connection point C6, the IN valve to the NO valve of SV3, the NO valve to the IN valve of SV5, the NO valve to the IN valve of SV1, the column 25, and the flow controller 731 in this order. In addition, the backup cylinder 19 is connected to the connection point C4.

[0042] The hydrogen sulfide gas cylinder 21 is connected to a connection point C6 via a main valve V3, a control valve R3, a flow controller 733, a branch B1, and a SV6 in that order. The branch B1 is also connected to the NC valve SV5 via the IN valve and NO valve of SV4.

[0043] Furthermore, the connection point C5 is connected to the connection point C1 via a check valve G2. The check valve G2 prevents gas from flowing from the connection point C1 to the connection point C5. The connection point C2 is also connected to the outlet of the gas to be measured via the main valve V2. The NC valve of SV4 is also connected to the exhaust gas outlet via the connection point C3 and the flow controller 732.

[0044] The gas supplied to the measuring unit 75 is humidified in the humidification pot 85 and reaches the detection pot where it is measured. After measurement, the gas is exhausted to the outside.

[0045] The hydrogen fuel supply device supplies hydrogen fuel at 0.2 to 0.8 MPa. The zero gas cylinder 17 supplies industrial hydrogen gas from which impurities have been removed in advance as zero gas at 0.2 to 0.8 MPa. The backup cylinder 19 supplies zero gas to the connection point C4 continuously and without interruption without relying on electrical control, so there are no gaps in the concentration measurement. In addition, it is possible to prevent the electrode element of the sensor cell 77 from being exposed to air and damaged. The hydrogen sulfide gas cylinder 21 supplies hydrogen sulfide gas calibrated at 0.1 MPa (an example of the "calibrated hydrogen sulfide gas" described in the claims of this application).

[0046] The control valve R1 adjusts the gas pressure to 0.05 MPa. The control valve R2 adjusts the gas pressure to 0.05 MPa. The control valve R3 adjusts the gas pressure to 0.06 MPa. The control valve R4 adjusts the gas pressure to 0.20 MPa. The control valve R5 adjusts the gas pressure to 0.15 MPa.

[0047] Fig. 5 is a flow diagram showing an example of a hydrogen sulfide gas measuring method according to this embodiment. Referring to Fig. 5, hydrogen sulfide is allowed to adhere to the entire piping, particularly the stainless steel parts, until it becomes saturated (an example of the "hydrogen sulfide adhering step" recited in the claims of this application). The hydrogen sulfide that adheres to the stainless steel parts of the piping does not peel off for a long time. When the flow is started, the main valves V1, V2, and V3 are open. Also, the solenoid valves SV1 to SV6 are OFF.

[0048] In step S11, SV1 to SV6 are kept OFF, zero gas is supplied from the zero gas cylinder 17 to the flow path 9, and purging is performed for 100 seconds (an example of the "purging step" described in the claims).

[0049] Next, in step S12, SV1, SV2, and SV3 are turned ON, and SV4, SV5, and SV6 are turned OFF, and hydrogen fuel gas is sampled from the hydrogen generation device 31 as the gas to be measured for 10 seconds and supplied to the flow path 9 (an example of the "sampling step" described in the present claims).

[0050] Next, in step S13, SV2, SV4, and SV6 are turned ON, and SV1, SV3, and SV5 are turned OFF, and while zero gas is supplied from the zero gas cylinder 17 to the flow path 9, carbon monoxide is removed from the hydrogen gas in the column 25 over 35 seconds (carbon monoxide removal step). Also, calibrated flow path hydrogen gas is supplied from the hydrogen sulfide gas cylinder 21 to the flow path 9. However, since the NC valve of SV4 is open and exhausted, the calibrated flow path hydrogen gas does not mix with the gas to be measured. The flow controller 3 controls the hydrogen sulfide concentration to 20 ppb.

[0051] Next, in step S14, SV2, SV5, and SV6 are turned ON and SV1, SV3, and SV4 are turned OFF, and calibrated flow path hydrogen gas is supplied from hydrogen sulfide gas cylinder 21 to flow path 9 over 10 seconds. Flow controller 3 controls the hydrogen sulfide concentration to 20 ppb. This causes hydrogen sulfide gas to be adsorbed to flow path 9 and the solenoid valve again until it reaches a saturated state. This makes it possible to measure hydrogen sulfide with good sensitivity and high accuracy even if the gas to be measured contains hydrogen sulfide.

[0052] Next, in step S15, SV1 to SV6 are turned off, and measurement is performed for 25 seconds while supplying zero gas from the zero gas cylinder 17 to the flow path 9 (an example of the "measurement step" described in the claims of this application).

[0053] Next, in step S16, the control unit determines whether or not to continue measuring the target gas. If it continues, the process returns to step S11. If it does not continue, the process ends.

[0054] 6 is a graph showing an example of the change over time in the hydrogen sulfide concentration in hydrogen gas actually measured by the hydrogen sulfide gas measurement system 1 according to this embodiment. The vertical axis represents the hydrogen sulfide concentration [ppb], and the horizontal axis represents the elapsed time. In the measurement, hydrogen gas with hydrogen sulfide concentrations of 0 ppb, 5 ppb, 10 ppb, 15 ppb, and 20 ppb was prepared by diluting 20 ppb of calibrated hydrogen sulfide gas with hydrogen gas.

[0055] As shown in FIG. 6, unlike the graph in FIG. 1, it can be seen that by using the hydrogen sulfide gas measurement system 1 of this embodiment, it is possible to measure extremely small amounts of hydrogen sulfide gas contained in hydrogen fuel gas with good responsiveness and high accuracy.

[0056] The column 25 may be included inside the hydrogen sulfide gas measuring device 7. [Explanation of symbols]

[0057] 1; hydrogen sulfide gas measurement system, 5; gas supply unit, 7; hydrogen sulfide gas measurement device, 9; flow path, 17; zero gas cylinder, 19; backup cylinder, 21; hydrogen sulfide gas cylinder, 25; column, 31; hydrogen fuel supply device, 71; solenoid valve, 73; flow controller, SV; solenoid valve

Claims

1. A hydrogen sulfide gas measurement method using a hydrogen sulfide gas measurement system that measures hydrogen sulfide gas in hydrogen gas, comprising: The hydrogen sulfide gas measurement system includes: A flow path through which the hydrogen gas flows; a flow rate control unit for controlling a rate at which the gas flows through the flow path; a detection cell for detecting hydrogen sulfide gas contained in the hydrogen gas; The hydrogen sulfide gas measurement system includes a hydrogen sulfide gas cylinder containing calibrated hydrogen sulfide gas; A zero gas cylinder containing zero gas from which impurities have been removed in advance, a hydrogen sulfide adhering step in which the flow rate control unit introduces hydrogen sulfide gas into the flow path to cause the hydrogen sulfide gas to adhere to the flow path; a purging step of supplying the zero gas from the zero gas cylinder to the flow path; A collection step of collecting the hydrogen gas; and a measuring step of measuring the hydrogen gas, A hydrogen sulfide gas measurement method, wherein in the hydrogen sulfide adhering step, the calibration hydrogen sulfide gas is supplied from the hydrogen sulfide gas cylinder to the flow path, and the hydrogen sulfide gas is allowed to adhere to the flow path until a saturated state is reached.

2. The hydrogen sulfide gas measurement system further includes a gas separation unit that separates at least carbon monoxide and hydrogen sulfide, 2. The hydrogen sulfide gas measuring method according to claim 1, further comprising a carbon monoxide removing step, prior to the measuring step, in which the gas separating section separates carbon monoxide contained in the hydrogen gas and removes it from the hydrogen gas.

3. A program for causing a computer to function as the flow rate control unit according to claim 1 or 2.

4. A hydrogen sulfide gas measurement system for measuring hydrogen sulfide gas in hydrogen gas, comprising: A flow path through which the hydrogen gas flows; a hydrogen sulfide gas cylinder containing hydrogen sulfide gas; a flow rate control unit for controlling a speed at which the gas flows through the flow path; a detection cell for detecting hydrogen sulfide gas contained in the hydrogen gas; A zero gas cylinder containing zero gas from which impurities have been removed in advance, The hydrogen sulfide gas cylinder is connected to the flow path via a control valve.

5. 5. The hydrogen sulfide gas measurement system of claim 4, wherein the hydrogen sulfide gas cylinder contains calibrated hydrogen sulfide gas.

6. 6. The hydrogen sulfide gas measuring system according to claim 4, further comprising a gas separation section that separates at least carbon monoxide and hydrogen sulfide.

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