JP2009014421A - High humidification gas analysis method and high humidification gas analyzer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high humidification gas analysis method and a high humidification gas analyzer capable of suppressing an influence on a product lifetime of an analysis means by high humidification gas, and analyzing even in the case of the analysis means incapable of analysis of the high humidification gas. <P>SOLUTION: In this high humidification gas analysis method, each mass flow rate of the high humidification gas and dry gas is adjusted respectively at each prescribed value and mixed together, and the dew point of mixed gas is measured, and a steam partial pressure is calculated based on a dew point measured value, and the mass flow rate of the dry gas is increased until the steam partial pressure becomes below the steam partial pressure maximum value set beforehand, and the mixed gas with the steam partial pressure becoming below the steam partial pressure maximum value is analyzed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an analysis method and an analysis apparatus for a highly humidified gas supplied to a fuel cell or the like, and particularly an analysis means that suppresses the influence of the highly humidified gas analyzing means on the product life and cannot analyze the highly humidified gas. Even so, the present invention relates to a highly humidified gas analyzing method and a highly humidified gas analyzing apparatus capable of analyzing.

  Prior art documents related to conventional highly humidified gas analysis methods and highly humidified gas analyzers include the following.

JP-A-61-048761 JP 07-098273 A JP 09-089765 A JP 2003-050203 A JP 2005-172472 A

  FIG. 3 is a configuration block diagram showing an example of a conventional highly humidified gas analyzer. In FIG. 3, 1 is an analysis target gas supply means such as a cylinder for supplying an analytically symmetric gas, 2 is a water vapor supply means for supplying water by generating water vapor by heating water, and 3 is a calibration target such as a cylinder for supplying calibration target gas. Gas supply means, 4 is a dilution gas supply means such as a cylinder for supplying dilution gas, 5 is a flow rate adjusting means for adjusting the mass flow rate of gas, 6 and 7 are switching valves for switching the gas flow path, and 8 is an FT-IR ( It is a gas analysis means such as Fourier transform InfraRed spectrophotometer.

  The analysis target gas supplied from the analysis target gas supply means 1 flows through a pipe (not shown) as shown by “FL01” in FIG. 3, and the water vapor supplied from the water vapor supply means 2 is “ As shown by FL02 ", it flows through a pipe (not shown) and is mixed with the gas to be analyzed shown by" FL01 "in FIG. 3, and flows through the pipe (not shown) as shown by" FL03 "in FIG. .

  Further, the mixed gas (highly humidified gas) indicated by “FL03” in FIG. 3 is a gas that flows out from one outlet of the switching valve 6 indicated by “FL04” in FIG. Gas) and flows through a pipe (not shown) as indicated by “FL05” in FIG. 3 and is supplied to one inlet of the switching valve 7.

  On the other hand, the calibration target gas supplied from the calibration target gas supply means 3 flows through a pipe (not shown) as indicated by “FL06” in FIG. 3 and is supplied to the first inlet of the flow rate adjustment means 5. The dilution gas supplied from the dilution gas supply means 4 flows through a pipe (not shown) as indicated by “FL07” in FIG. 3 and is supplied to the second inlet of the flow rate adjustment means 5.

  The mass flow adjusted gas to be calibrated flowing out from the first outlet of the flow rate adjusting means 5 flows through a pipe (not shown) as indicated by “FL08” in FIG. To be supplied. Further, the diluted gas whose mass flow rate has been adjusted flowing out from the second outlet of the flow rate adjusting means 5 flows through a pipe (not shown) as indicated by “FL09” in FIG.

  In addition, the diluted gas whose mass flow rate has been adjusted indicated by “FL09” in FIG. 3 is mixed with the calibration target gas whose mass flow rate has been adjusted flowing out from the other outlet of the switching valve 6 indicated by “FL10” in FIG. 3 flows through a pipe (not shown) as indicated by “FL11” in FIG. 3 and is supplied to the other inlet of the switching valve 7.

  Finally, the mixed gas flowing out of the outlet of the switching valve 7 (analysis target gas, mixed gas of water vapor and calibration target gas, or mixed gas of calibration target gas and dilution gas) is indicated by “FL12” in FIG. As shown, it flows through a pipe (not shown) and is supplied to the inlet of the gas analyzing means 8.

  Here, the operation of the conventional example shown in FIG. 3 will be described. First, the switching valve 6 is switched to the other outlet (in order to flow the calibration target gas whose mass flow rate is adjusted as indicated by “FL08” in FIG. 3 as indicated by “FL10” in FIG. 3). 7 is switched to the other inlet (in order to flow the mixed gas of the gas to be calibrated and the dilution gas indicated by “FL11” in FIG. 3 as indicated by “FL12” in FIG. 3).

  The flow rate adjusting unit 5 adjusts the flow rates of the calibration target gas supplied from the calibration target gas supply unit 3 and the dilution gas supplied from the dilution gas supply unit 4 to predetermined values, and these gases are mixed (predetermined) 3) and mixed and introduced into the gas analyzing means 8 as indicated by "FL11" in FIG. 3 and "FL12" in FIG.

  The gas analyzing means 8 calibrates the calibration target gas and the dilution gas by analyzing the mixed gas of the calibration target gas whose mass flow rate has been adjusted and the dilution gas whose mass flow rate has been adjusted.

  Second, the switching valve 6 switches to one outlet (in order to flow the calibration target gas whose mass flow rate is adjusted as indicated by “FL08” in FIG. 3 as indicated by “FL04” in FIG. 3). To switch to one inlet (in order to flow the mixed gas of the analysis target gas indicated by “FL05” in FIG. 3, the water vapor, and the calibration target gas whose mass flow rate has been adjusted as indicated by “FL12” in FIG. 3).

  The flow rate adjusting unit 5 adjusts the flow rate of the calibration target gas supplied from the calibration target gas supply unit 3 to a predetermined value, and further mixes it with the mixed gas (highly humidified gas) of the analysis target gas and water vapor. Such a mixed gas is introduced into the gas analyzing means 8 as indicated by “FL05” in FIG. 3 and “FL12” in FIG.

  The gas analysis means 8 calculates the mass flow rate of the analysis target gas from the mass concentration of the calibration target gas obtained by analyzing the mixed gas of the analysis target gas, water vapor, and the calibration target gas whose mass flow rate has been adjusted. Then, the analysis result is corrected with the calculated mass flow rate to determine the amount of the constituent component of the analysis target gas.

  As a result, the calibration target gas whose mass flow rate was adjusted was mixed with the mixed gas (highly humidified gas) of the analysis target gas and water vapor, and the mass flow rate of the analysis target gas was calculated from the mass concentration of the calibration target gas. It is possible to analyze the highly humidified gas by correcting the analysis result with the mass flow rate to obtain the amount of the constituent component of the analysis target gas.

  However, in the conventional example shown in FIG. 3, since the dew point (or humidity) of the gas introduced into the gas analyzing means 8 is not managed, the product life of the gas analyzing means is shortened by the introduction of the highly humidified gas. There was a problem that said.

In addition, depending on the type of the gas analysis means 8, there is a gas analysis means in which the analysis error of the highly humidified gas becomes large, or a gas analysis means that cannot originally analyze the highly humidified gas, and it is difficult to accurately analyze the highly humidified gas. There was a problem I said.
Therefore, the problem to be solved by the present invention is that a highly humidified gas analysis that can analyze even an analysis means that suppresses the influence of the highly humidified gas on the product life of the analyzing means and cannot analyze the highly humidified gas. The object is to realize a method and a highly humidified gas analyzer.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
A highly humidified gas analysis method,
The mass flow rate of the highly humidified gas and the dry gas is adjusted to a predetermined value and mixed to measure the dew point of the mixed gas, the water vapor partial pressure is calculated based on the dew point measured value, and the water vapor partial pressure is preset. By increasing the mass flow rate of the dry gas until the water vapor partial pressure is below the maximum value, and analyzing the mixed gas in which the water vapor partial pressure is below the water vapor partial pressure maximum value, analysis with a highly humidified gas The influence of the means on the product life is suppressed, and even analysis means incapable of analyzing highly humidified gas becomes possible.

The invention according to claim 2
In the highly humidified gas analyzer,
Analytical gas supply means for supplying highly humidified gas, dilution gas supply means for supplying dry gas, flow rate adjusting means for adjusting mass flow rates of the highly humidified gas and the dry gas, and flow rate adjusting means The first and second solenoid valves for passing / blocking the mixed gas of the highly humidified gas and the dry gas adjusted for mass flow, and the dew point for measuring the dew point of the mixed gas passing through the first solenoid valve A measuring means, a gas analyzing means for analyzing the mixed gas passing through the second electromagnetic valve, and a water vapor partial pressure calculated based on the measured dew point of the mixed gas while controlling the entire apparatus are preset. And a control means for performing gas analysis after adjusting the mass flow rate of the dry gas so as to be equal to or lower than the maximum value of the water vapor partial pressure. The effect on the life suppressed, enabling even analysis of analytical means which can not be analyzed in the high humidity gas.

The invention described in claim 3
In the highly humidified gas analyzer which is the invention according to claim 2,
The control means is
Controlling the flow rate adjusting means to adjust the mass flow rates of the highly humidified gas and the dry gas to respective predetermined values to generate the mixed gas, and controlling the first and second electromagnetic valves; The mixed gas is supplied to the dew point measuring means, the dew point of the mixed gas is measured, the water vapor partial pressure is calculated based on the dew point measurement value, and the water vapor partial pressure is preset by controlling the flow rate adjusting means. The mixed gas in which the mass flow rate of the dry gas is increased until the water vapor partial pressure is less than the maximum value and the first and second solenoid valves are controlled so that the water vapor partial pressure is less than the water vapor partial pressure maximum value. Is supplied to the gas analyzing means to perform gas analysis, thereby suppressing the influence of the highly humidified gas on the product life of the analyzing means, and even if the analyzing means cannot analyze the highly humidified gas. It becomes possible.

The invention according to claim 4
In the highly humidified gas analyzer which is the invention according to claim 2,
By providing the third solenoid valve that directly exhausts the mixed gas, the influence of the highly humidified gas on the product life of the analyzing means is suppressed, and analysis is possible even if the highly humidified gas cannot be analyzed. Is possible.

The invention according to claim 5
In the highly humidified gas analyzer which is the invention according to any one of claims 2 to 4,
The gas analyzing means comprises:
The analysis means that the product life is affected by the analysis of the highly humidified gas, so that the influence of the highly humidified gas on the product life of the analysis means is suppressed and the analysis of the highly humidified gas is impossible. Can also be analyzed.

The invention described in claim 6
In the highly humidified gas analyzer which is the invention according to any one of claims 2 to 4,
The gas analyzing means comprises:
Because it is an analysis means that cannot analyze highly humidified gas, the influence of the highly humidified gas on the product life of the analyzed means is suppressed, and analysis is possible even if it is impossible to analyze highly humidified gas. become.

The present invention has the following effects.
According to the first, second, third, fourth, and fifth aspects of the invention, the high humidified gas and the dry gas are mixed to generate a mixed gas, and calculated based on the dew point of the generated mixed gas. The gas analysis is performed after adjusting the mass flow rate of the dry gas so that the water vapor partial pressure is less than the preset water vapor partial pressure maximum value, thereby suppressing the influence of the highly humidified gas on the product life of the analysis means. Even analysis means incapable of analyzing highly humidified gas can be analyzed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a highly humidified gas analyzer according to the present invention.

  In FIG. 1, 9 is an analysis target gas supply means such as a cylinder that supplies an analysis target gas that is a highly humidified gas, 10 is a dilution gas supply means such as a cylinder that supplies a dilution gas that is a dry gas, and 11 and 12 are gases. The flow rate adjusting means for adjusting the mass flow rate of the gas, 13, 14 and 15 are solenoid valves for passing / blocking the gas by ON / OFF control, 16 is the dew point measuring means for measuring the dew point of the gas, 17 is FT-IR, etc. The gas analysis means 18 is a control means for controlling the entire highly humidified gas analyzer.

  An analysis target gas (hereinafter simply referred to as a high humidification gas) that is a highly humidified gas supplied from the analysis target gas supply means 9 flows through a pipe (not shown) as indicated by “FL21” in FIG. To the inlet of the flow rate adjusting means 11.

  Similarly, a dilution gas (hereinafter simply referred to as dry gas) supplied from the dilution gas supply means 10 flows through a pipe (not shown) as indicated by “FL22” in FIG. It is supplied to the inlet of the flow rate adjusting means 12.

  The high humidified gas whose mass flow rate has been adjusted flowing out from the outlet of the flow rate adjusting means 11 and the dry gas whose mass flow rate has been adjusted flowing out from the outlet of the flow rate adjusting means 12 are “FL23” and “FL24” in FIG. As shown in the figure, they flow through piping (not shown) and are mixed with each other.

  Then, the mixed gas of the highly humidified gas whose mass flow rate has been adjusted and the dry gas whose mass flow rate has been adjusted flows through a pipe (not shown) as indicated by “FL25” in FIG. Fifteen inlets are respectively supplied.

  The mixed gas flowing out from the outlet of the solenoid valve 13 flows through a pipe (not shown) as indicated by “FL26” in FIG. 1 and is supplied to the inlet of the dew point measuring means 16, and “EX21” in FIG. As shown in the figure, the air is exhausted from the exhaust port of the dew point measuring means 16.

  Further, the mixed gas flowing out from the outlet of the solenoid valve 14 flows through a pipe (not shown) as shown by “FL27” in FIG. 1 and is supplied to the inlet of the gas analyzing means 17, and in FIG. As indicated by “EX22”, the gas is exhausted from the exhaust port of the gas analyzing means 17.

  Further, the mixed gas flowing out from the outlet of the solenoid valve 15 is directly exhausted as indicated by “EX23” in FIG.

  Finally, the measurement output signal of the dew point measuring means 16 is applied to the control means 18 and various control signals are supplied to the flow rate adjusting means 11 and 12, the solenoid valves 13, 14 and 15, and the control input terminal of the gas analyzing means 17. Each is connected.

  Here, the operation of the embodiment shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a flowchart for explaining the operation of the control means 18 for controlling the entire highly humidified gas analyzer.

  In “S001” in FIG. 2, the control means 18 controls the flow rate adjusting means 11 and 12 to adjust the mass flow rates of the highly humidified gas and the dry gas to respective predetermined values and mix them to generate a mixed gas. At the same time, in “S002” in FIG. 2, the control means 18 controls the solenoid valves 13, 14 and 15, respectively.

  For example, the control means 18 controls the electromagnetic valves 13, 14 and 15, respectively, controls the electromagnetic valve 13 to “ON”, and controls the electromagnetic valves 14 and 15 to “OFF”.

  Therefore, the mixed gas generated in the step “S001” in FIG. 2 passes through the solenoid valve 13 and flows through a pipe (not shown) as indicated by “FL26” in FIG. The dew point of the mixed gas is measured by the dew point measuring means 16.

In “S003” in FIG. 2, the control means 18 acquires the dew point measurement value “DP” from the dew point measurement means 16, and in “S004” in FIG. 2, the control means 18 determines the water vapor content based on the dew point measurement value “DP”. The pressure “P _DP ” is calculated.

Then, in “S005” in FIG. 2, the control means 18 compares the water vapor partial pressure maximum value “P _max ” set in advance with the calculated water vapor partial pressure “P _DP ”. When it is determined that the pressure “P _DP ” is larger than the maximum water vapor partial pressure value “P _max ”, the process proceeds to the step “S006” in FIG.

On the other hand, if it is determined that the water vapor partial pressure “P _DP ” is less than or equal to the water vapor partial pressure maximum value “P _max ”, the control means 18 in “S005” in FIG. Move to the step.

  In “S006” in FIG. 2, the control unit 18 controls the flow rate adjusting unit 12 to adjust the mass flow rate of the dry gas. Specifically, the control unit 18 controls the flow rate adjusting unit 12 to increase the mass flow rate of the dry gas.

  The control means 18 waits for the set time in “S007” in FIG. 2, then returns to the step of “S003” in FIG. 2, and the dew point measurement value after increasing the dry gas mass flow rate from the dew point measurement means 16. To get it again.

That is, the control means 18 controls the flow rate adjusting means 12 to sequentially increase the mass flow rate of the dry gas until the water vapor partial pressure “P _DP ” is equal to or lower than the water vapor partial pressure maximum value “P _max ”, and the dew point measurement value is increased. Will repeat the control to acquire again.

  On the other hand, in “S008” in FIG. 2, the control means 18 controls the electromagnetic valves 13, 14, and 15, respectively.

  For example, the control means 18 controls the electromagnetic valves 13, 14 and 15, respectively, controls the electromagnetic valve 14 to “ON”, and controls the electromagnetic valves 13 and 15 to “OFF”.

  For this reason, the mixed gas (or mixed gas after increasing the mass flow rate of the dry gas) generated in the step “S008” in FIG. 2 passes through the electromagnetic valve 14 and is “FL27” in FIG. As shown in FIG. 3, the gas flows through a pipe (not shown) and is supplied to the gas analyzing means 17.

  In “S009” in FIG. 2, the control means 18 waits for a set time, and in “S010” in FIG. 2, the control means 18 controls the gas analysis means 17 to analyze the mixed gas.

At this time, the mass flow rate of the dry gas is adjusted so that the water vapor partial pressure “P _DP ” of the mixed gas supplied to the gas analyzing means 17 is equal to or less than a preset water vapor partial pressure “P _max ”. Therefore, it is possible to suppress the influence of the analysis means on the product life due to the highly humidified gas.

As a result, the water vapor partial pressure “P _DP ” calculated based on the dew point of the generated mixed gas is generated by mixing the highly humidified gas and the dry gas, and the preset water vapor partial pressure maximum value. By performing the gas analysis after adjusting the mass flow rate of the dry gas so as to be equal to or less than “P _max ”, even analysis means that cannot analyze the highly humidified gas can be analyzed.

  In addition, in the Example shown in FIG. 1, although the solenoid valve 15 which exhausts a mixed gas directly is provided, the solenoid valve 15 is not an essential component.

  Further, in the embodiment shown in FIG. 1, the mass flow rates of the highly humidified gas and the dry gas are adjusted to predetermined values by two flow rate adjusting means, respectively. Of course, as in the conventional example shown in FIG. The mass flow rate of the kind of gas may be replaced with a flow rate adjusting means that can be individually controlled.

  In the description of the embodiment shown in FIG. 1, the control means 18 waits for a set time and then acquires the dew point measurement value and analyzes the mixed gas. However, various conditions of the mixed gas are immediately stabilized. If so, the steps indicated by “S007” in FIG. 2 and “S009” in FIG. 2 can be omitted.

  Further, the entire highly humidified gas analyzer may be held at a predetermined temperature or higher by a heating means (not shown) in order to prevent condensation.

It is a block diagram showing the configuration of an embodiment of the highly humidified gas analyzer according to the present invention. It is a flowchart explaining operation | movement of the control means which controls the whole highly humidified gas analyzer. It is a block diagram showing an example of a conventional highly humidified gas analyzer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,9 Analysis object gas supply means 2 Water vapor supply means 3 Calibration object gas supply means 4,10 Dilution gas supply means 5,11,12 Flow rate adjustment means 6,7 Switching valve 8,17 Gas analysis means 13,14,15 Electromagnetic Valve 16 Dew point measuring means 18 Control means

Claims (6)

A highly humidified gas analysis method,
Adjust the mass flow rate of the highly humidified gas and dry gas to a predetermined value and mix to measure the dew point of the mixed gas,
Calculate water vapor partial pressure based on the measured dew point,
Increase the mass flow rate of the dry gas until the water vapor partial pressure is less than or equal to a preset water vapor partial pressure maximum value,
The method for analyzing a highly humidified gas, comprising analyzing the mixed gas in which the water vapor partial pressure is less than or equal to the maximum value of the water vapor partial pressure. In the highly humidified gas analyzer,
An analysis target gas supply means for supplying a highly humidified gas;
Dilution gas supply means for supplying dry gas;
Flow rate adjusting means for adjusting the mass flow rates of the highly humidified gas and the dry gas, respectively;
First and second solenoid valves for passing / blocking the mixed gas of the highly humidified gas and the dry gas whose mass flow rate has been adjusted from the flow rate adjusting means;
Dew point measuring means for measuring a dew point of the mixed gas passing through the first solenoid valve;
Gas analyzing means for analyzing the mixed gas passing through the second electromagnetic valve;
After controlling the entire apparatus and adjusting the mass flow rate of the dry gas so that the water vapor partial pressure calculated based on the measured dew point of the mixed gas is equal to or lower than the preset water vapor partial pressure maximum, gas analysis is performed. And a high-humidified gas analyzer. The control means is
Controlling the flow rate adjusting means to adjust the mass flow rates of the highly humidified gas and the dry gas to respective predetermined values to generate the mixed gas,
Controlling the first and second solenoid valves to supply the mixed gas to the dew point measuring means to measure the dew point of the mixed gas;
Calculate water vapor partial pressure based on the measured dew point,
Control the flow rate adjusting means to increase the mass flow rate of the dry gas until the water vapor partial pressure is less than or equal to a preset water vapor partial pressure maximum value,
The gas analysis is performed by controlling the first and second solenoid valves to supply the gas analysis means with the mixed gas whose water vapor partial pressure is equal to or lower than the water vapor partial pressure maximum value. The highly humidified gas analyzer according to claim 2. 3. The highly humidified gas analyzer according to claim 2, further comprising a third electromagnetic valve that directly exhausts the mixed gas. The gas analyzing means comprises:
The highly humidified gas analyzer according to any one of claims 2 to 4, wherein the highly humidified gas analyzer is an analysis unit that has an effect on product life due to analysis of a highly humidified gas. The gas analyzing means comprises:
The high-humidified gas analyzer according to any one of claims 2 to 4, wherein the high-humidified gas is an analysis means incapable of analyzing high-humidified gas.

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