JP3471569B2 - Air pollution hazardous substance measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the gasification of specific components such as benzene, toluene and xylene contained in the atmosphere.
The present invention relates to a device for measuring air pollutant harmful substances, which can be measured by using a chromatograph.

[0002]

2. Description of the Related Art Various apparatuses for measuring specific harmful substances in the atmosphere using a gas chromatograph are known. Although the device is not shown, basically, for example, after introducing air as a sample gas into the concentration tube to adsorb a specific component, the concentration tube is heated to release the specific component,
A carrier gas is carried to form a concentrated sample gas, and the concentrated sample gas is passed through a separation column or an analysis column to further separate only a specific component and introduce the gas into an analyzer to obtain a gas chromatogram.

[0003]

However, in the conventional device, a series of measurement work from the sampling of the sample gas to the introduction of only the specific component into the analyzer, that is, the heating of the concentrating tube and the switching of the flow paths are carried out. All the operations such as the above are manually performed at a predetermined timing, and especially when continuous measurement is performed for a long period of time, it is not convenient.

The present invention has been made in view of such circumstances.
It is an object of the present invention to provide an air pollution harmful substance measuring device capable of continuous measurement without requiring labor even for a long period of time.

[0005]

The present invention comprises means for solving the above-mentioned problems as follows. That is, in the invention described in claim 1, the sample gas is introduced.
Sample introduction means and the sample introduction means
A sample gas line for introducing sample gas, a concentrating tube for adsorbing a specific component in the sample gas, and a carrier gas is introduced into the concentrating tube by switching the flow path after completion of adsorption, and is separated from the concentrating tube by heating.
Ru is supported a specific component in the carrier gas is passage change換手
And the amount of the specific component carried in the carrier gas
A separation column and the specific component are separated from the separation column.
And analytical column for introducing by supporting the separated specific component in the carrier gas by switching the passage switching device after got released after a predetermined time, a specific component separated by the analytical column by entering guide An analyzer that obtains a gas chromatogram and a sample after the analysis is completed from this analyzer
An exhaust gas line for discharging a gas, the gas chromatogram, in the air pollutant hazardous substance measuring device configured to be able to measure the specific component contained in the atmosphere, the sample introduction means, the concentration tube The heating means for heating and the flow path switching means are controlled by the control means at predetermined timing in accordance with a preset control program, and the respective steps are automatically and continuously performed. Together with the sample gas
If a bypass line is installed between the in and the exhaust gas line,
Between this bypass line and the sample gas line
Install a pump for overflow in the flow path of
Three-way switching valve at the connection between the spline and the sample gas line
Is installed, and by operating this three-way switching valve,
Gas is introduced into the concentration tube or discharged outside the system
The feature is that it is configured so that it can be selected .

As described above, the sample introducing means, the heating means for heating the concentrating tube, and the flow path switching means are controlled and operated at a predetermined timing according to a preset control program. All processes for component measurement can be automatically and continuously operated without requiring manpower.

[0007]

[0008] In the invention described in claim 2, connect the calibration gas line for introducing calibration gas into Luba Ipasurain put to the invention described in claim 1, in the calibration gas line
A solenoid valve is provided, and this solenoid valve and the three-way switching valve are used.
The switching means is configured to introduce the calibration gas into the sample gas line instead of the sample gas.
is there.

[0009] In the invention described in claim 3, the put that control means to the invention of claim 2, measurement cycle reaches a predetermined number of times or a predetermined time, for the valve switching the three-way selector valve An automatic calibration processing unit is provided for sending control output and automatically performing calibration .

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an air pollution harmful substance measuring device of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the overall configuration of the apparatus. In the figure, reference numeral 1 is a flow path switching means, which is equipped with, for example, 10 ports (indicated by reference numerals a to j in the clockwise direction in the drawing) and is switched by an actuator. It consists of a working ten-way valve. Reference numeral 2 is a sample introduction means (suction cylinder), one end of which is connected to the port a through a connecting pipe 4 having a three-way solenoid valve 3 and the other end of which is provided with a filter 6 through a three-way solenoid valve 5 for driving. It is connected to the air inlet 7. In addition, 9 is a five-way solenoid valve, 1
0 is a capillary.

[0011] port b adjacent to the port d of Jippo valve 1, the sample gas line 11 via the connected to the inlet 13 of the sample gas, said sample gas line 1 1 three-way solenoid as three-way valve A valve 42 and a filter 12 are provided. 14 is a concentrating pipe, and connecting pipes 15 and 16
Is connected to the ports c and j of the ten way valve 1. Incidentally, the concentrated tube 14, although not shown, by the tube itself is energized, is configured to be exothermic Atsushi Nobori, the inside, enrichment filler for adsorbing a specific component It is filled.

17 is a separation column, 18 is an analytical column,
The separation column 17 is connected to the ports d and h of the ten-way valve 1 through connecting pipes 19 and 20, one end of the analytical column 18 is connected to a port g through a connecting pipe 21, and the other end is a photoionization detector. The analyzer 22 is connected to the exhaust port 23 via the exhaust gas line 35.

[0013] Jippo port e of the valve 1 is connected to a discharge Gasurai emission 35 through the capillary 24. The port f is connected to the carrier gas line 28, the carrier gas line 28 a carrier gas (e.g. _{N 2}
Gas) inlet port 30 and its carrier gas line
It need valve 26 to down 28, the pressure regulating valve 27, solenoid valve
27a and a filter 29 are provided. The port i adjacent to the port h is connected to the need valve 2 via the connecting pipe 36.
6 is connected to the carrier gas line 28 between the pressure regulating valve 27 and a need valve 37 is provided in the connecting pipe 36. 34 is a constant temperature bath. 33 is a filter 38
An air cooling device (not shown) is provided as a connecting pipe provided in the vicinity of the concentrating pipe 14 via.

39 is an exhaust gas line 35 and a sample gas line
A bypass line connected between the three-way solenoid valve 42 provided in the in 11 and 40 is a bypass line 39 and a sump line.
A pump for overflow connected to the flow path between the calibration gas line 11 and the gas line 11. A calibration gas inlet 25 is connected to the calibration gas inlet 25 and the bypass line 39, for example, an N ₂ gas cylinder is connected. An electromagnetic valve 41 and a capillary 43 are provided at 44 . The solenoid valve 41 and the three-way solenoid valve 42 constitute the switching means in claim 2 .

The sample gas is introduced into the concentrating tube 14 by turning on / off the above-mentioned three-way solenoid valve 42, or
Alternatively, it is possible to select whether or not the sample gas is discharged to the outside of the system through the bypass line 39, which makes it possible to continuously supply the sample gas. Therefore, as in the conventional case, the sample gas is stored in a buffer or the like. It is possible to more accurately grasp the change in the concentration of the sample gas with time, as compared with the case of performing the measurement by the above method. Incidentally, the three-way solenoid valve 42
The controller 51 at a predetermined timing as shown below.
Preferably, the control operation is performed by

In the present invention, the device constructed as described above is controlled and operated by the controller 51, which is a control means, at a predetermined timing in accordance with a preset control program. The valve 42, the heating means of the concentrating tube 14, and the ten-way valve 1 are driven by the control output from the controller 5. less than,
The measurement flow performed by the controller 51 will be described (see FIG. 2). The concentration tube 14 is configured to generate heat and rise in temperature when it is energized.

First, the sample gas line shown in FIG.
In a state where 11 communicates with the sample gas introduction port 13 (three-way solenoid valve 42 is off ), the suction cylinder 2 is operated (S1), the sample gas (atmosphere) is introduced from the introduction port 13, and the concentrating tube is introduced. A specific component such as benzene, toluene, xylene is adsorbed on 14 (S2).

The timing after completion of adsorption is read, and the ten-way valve 1 is switched ( state shown by a broken line in FIG. 1 ) (S
3) At the same time as introducing the carrier gas, the concentration tube 14 is heated so that the adsorbed specific component is desorbed and supported by the carrier gas, and introduced into the separation column 17 (S4).
S5).

[0019] The In separation column 17, the specific component is separated from the other components (S6), since the separated specific component is too long and released from the separation column 17 after a predetermined time has elapsed, the specific component connecting pipe The timing from 20 to the passage of the ports h and g is read, and the ten-way valve 1 is switched to the solid line state (S7).

The specific component separated and released from the separation column 17 is carried by the carrier gas and introduced into the analysis column 18 (S8), while the sample gas remaining in the separation column 17 other than the specific component is carried by the carrier gas. Then, back flush is performed from the discharge port 23 (S9).

In the analytical column 18, only the specific component is further separated and produced and introduced into the analyzer 22 to obtain a chromatogram as shown in FIG. 3, for example. In FIG. 3, B is benzene, T is toluene, and X is xylene. In addition,
The specific component after analysis is discharged from the discharge port 23.

It is preferable to complete the above-mentioned series of measurement cycles in 10 minutes, and the next measurement cycle can be immediately and continuously repeated to perform automatic measurement without requiring a long period of time. In the invention, by turning on the three-way solenoid valve 42 at a predetermined timing, the sample gas can be discharged to the outside of the system through the bypass line 39, and the sample gas can be continuously supplied at all times.
It is possible to accurately grasp the change in concentration in real time.

The predetermined number of measurement cycles are completed.
At the time point or when the predetermined measurement time has elapsed, the three
By turning on the solenoid valves 42 and 41,
You can also enable automatic span calibration.
It For that purpose, an automatic calibration processing unit (not shown) is provided in the CPU of the controller 51. For example, when the measurement cycle reaches a predetermined number, the solenoid valve 41 and the three-way solenoid valve 42, which are switching valves, are switched. It suffices to send a control output for performing the calibration gas and automatically introduce the calibration gas into the sample gas line 11 so that the span calibration can be performed, and the measurement cycle can be continued immediately after the calibration is completed.

[0024]

As described above, according to the invention described in claim 1, the sample introducing means, the heating means for the concentrating tube, and the flow path switching means are controlled by the control means at predetermined timings. it is operated, since the allow a series of measurement process automatically and continuously, it is possible to continuously and automatically measured in without waste, short measurement cycle time.

Then, in the apparatus according to claim 1,
Allows the user to select whether to introduce the sample gas into the concentration tube or to discharge it outside the system by operating the switching valve.
The sample gas can be continuously supplied to the sample gas line, and the change in the concentration of the sample gas can be accurately grasped in real time.

Further, in the invention described in claim 2 , since the calibration gas is introduced into the sample gas line,
Automatic measurement can be easily calibrated at the appropriate time ended.

Further, in the invention according to claim 3 , the calibration gas is introduced into the sample gas line by the automatic calibration processing unit at the time when a predetermined number of measurement cycles are completed or when a predetermined measurement time elapses, automatically can and child <br/> to be calibrated.

[Brief description of drawings]

FIG. 1 is one example of an apparatus for measuring air pollutant harmful substances according to the present invention.
It is a whole lineblock diagram showing an embodiment.

FIG. 2 is a flowchart for explaining automatic measurement in the device .

FIG. 3 is a graph showing an example of a gas chromatogram in the apparatus .

[Explanation of symbols]

1 ... channel switching換手stage, 2 ... sample introduction hand stage, 11 ... sample gas line, 14 ... concentrate tube, 17 ... separation column, 1
8 ... Analysis column, 22 ... Analyzer, 35 ... Exhaust gas line,
39 ... Bypass line, 41, 42 ... Switching means, 42 ...
Switching valve, 44 ... calibration gas line, 51 ... control hand stage.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Kato 2 Higashi-cho, Kichijoin-miya, Minami-ku, Kyoto-shi, Kyoto (56) References JP-A-7-72131 (JP, A) JP-A 7-318545 (JP, A) JP-A-5-52832 (JP, A) JP-A-8-94600 (JP, A) JP-B-53-22477 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 30/08 G01N 30/04 G01N 30/88 ZAB

Claims (3)

(57) [Claims] 1. A sample introduction hand for introducing a sample gas.
And the sample gas is introduced by this sample introduction means.
Sample gas line for adsorbing, a concentrating tube for adsorbing a specific component in the sample gas, and switching of the flow path after adsorption is completed.
And <br/> carrier gas stream Ru supported on path switching means specific component is disengaged from the concentrate tube by heating while introducing a carrier gas into the concentrating pipe by obtaining, carrier gas
A separation column of introducing specific component is supported on a scan, said <br/> specific component switches the passage switching device after got separated and released after a predetermined time has elapsed from the separation column
The specific component separated by
And analytical column for introducing a spectrometer to obtain a gas chromatogram of the specific component separated in the analytical column by entering guide,
The sample gas after the analysis is completed is discharged from this analyzer.
With an exhaust gas line, the gas chromatogram can be used to measure the specific component contained in the atmosphere.
In the air pollution harmful substance measuring device configured, the sample introduction means, a heating means for heating the concentration tube, the flow path switching means, by the control means,
Is control operation at a predetermined timing according to preset control programs, wherein while configured to allow to each process automatically continuously, a bypass between the sample gas line and the exhaust gas line
A line is installed and this bypass line and the sun
Pump for overflow in the flow path between the pull gas lines
At the connection between the bypass line and the sample gas line.
By installing a three-way switching valve and operating this three-way switching valve,
Sample gas is introduced into the concentrating tube, or
An air pollutant hazardous substance measuring device, characterized in that it is configured so that it can be selected to be discharged outside the system. 2. A calibration gas is introduced into the bypass line.
Connect the calibration gas line for
A magnetic valve is provided and is composed of this solenoid valve and the three-way switching valve.
The calibration gas is used instead of the sample gas by the switching means.
It is configured to be introduced into the sample gas line.
Air pollution harmful substances measurement device according to claim 1 that. 3. The control means has a predetermined number of measurement cycles.
Or, when the specified time is reached, the three-way switching valve
Automatic control for sending the control output of
The air pollutant hazardous substance measuring device according to claim 2, wherein a normal processing unit is provided .