JPS6322537B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous gas sampling device used for measuring changes in gas concentration in fields such as fluid engineering and pollution measurement.

Traditionally, measuring gas concentration in a flowing state is
It is generally considered difficult to measure gas concentration, except in special cases such as radioactive gases (see Fluid Dynamics Experimental Method; edited by Ichiro Tani et al., published by Iwanami Shoten, pp. 124-125). Sampling of measurement gas is performed by a gas sampling device such as the one shown in the figure. That is, a pitot tube-shaped collection tube 2 is placed at the position in the wind pipe 1 where the gas concentration is to be measured, and the measurement is carried out through the collection tube 2 into a collection bottle 3 whose interior is evacuated by suction by a vacuum pump 4. In this method, a gas is introduced and analyzed using an appropriate analyzer to determine the concentration. In addition, in the figure, 5 and 6 indicate pressure regulating valves, and 7 indicates a manometer.

However, in such a conventional gas sampling device, the gas in the pipe from the collection tube 2 to the collection bottle 3 is also introduced into the collection bottle 3, and mixes with the gas to be collected. In order to reduce the analysis error caused by this, it is necessary to
However, if the size of the collection bottle 3 is increased, a large amount of gas will be sucked from the collection tube 2, which has the disadvantage of changing the flow condition around the collection tube 2. Furthermore, such a gas sampling device has the disadvantage that it can only collect once at one sampling point.

The present invention makes it possible to collect only the amount of gas necessary for analysis from the collection tube without using such a collection bottle, and also to make it possible to continuously collect gas from the collection tube while preventing gas mixing. The purpose is to

In order to achieve this object, the continuous gas sampling device of the present invention has a collection tube that sucks the gas to be collected, in which an analysis gas is dissolved to form a fluid plug that intermittently partitions the sucked gas. It is constructed by connecting a liquid supply pipe for supplying a difficult liquid, and providing a valve on this liquid supply pipe for intermittently supplying the liquid.

Therefore, by adjusting the opening/closing timing of the valve mentioned above, it is possible to collect the required amount of gas while minimizing changes in the gas flow state near the sampling point, and also to prevent the gases being collected one after another from mixing with each other. It is possible to continuously collect gas while preventing this, and it can be effectively used for measuring changes in gas concentration, etc.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the embodiment shown in FIG. 2, a collection tube 11 inserted into a wind pipe 10 is connected to a gas-liquid separation bottle 13 via a vinyl tube 12, and a suction pump 14 is further connected to the gas-liquid separation bottle 13. . Further, a liquid supply pipe 16 is communicated with the vicinity of the collection port 15 at the tip of the collection pipe 11, and this liquid supply pipe 16 is connected to a liquid supply source via a valve such as a solenoid valve 17.
The electromagnetic valve 17 is opened and closed in order to intermittently send a small amount of liquid to the collection tube 11, and the liquid thus sent to the collection tube 11 is collected by suction by the suction pump 14. A liquid plug 18 is formed which intermittently partitions the gas sucked into the collecting pipe 11. The liquid supply source can be used, for example, by holding a container containing liquid at a required height to apply pressure due to the drop, or by applying the required air pressure to a sealed liquid container. All you have to do is give it.
In addition, the liquid needs to be one in which the gas to be analyzed is difficult to dissolve; for example, water is used when analyzing SF ₆ gas, or SO ₂
In the case of gas, use silicone oil, etc.
It should be selected appropriately depending on the analysis gas.

In order to collect gas using the sampling device having the above configuration, the suction pump 14 is kept in a state where gas is continuously sucked from the collection tube 11, and at the time when gas collection is to be performed, the solenoid valve 17 The liquid is intermittently supplied into the collection tube 11 by this operation. As a result, the gases collected in the collection tube 11 are successively partitioned by the liquid plugs 18, and are guided into the vinyl tube 12 while preventing the successively collected gases from mixing with each other. Therefore, by stopping the suction at an appropriate point, it is possible to obtain the collected gas separated by the liquid plugs 18 in the order of collection in the vinyl tube 12, and by extracting the desired collected gas with the gas syringe, the analyzer Gas analysis can be performed using In this case,
It is necessary to appropriately set the length of the vinyl tube 12 depending on how long the gas is to be collected continuously. Incidentally, instead of the vinyl tube 12, an appropriate means for sequentially and individually taking out the gas partitioned by the liquid stoppers may be added.

As described above, according to the continuous gas sampling device of the present invention, only the amount of gas required for analysis can be collected by operating the valve, so there is less disturbance in the flow state near the collection tube, and the desired collection can be carried out. Gas can be collected accurately at a point, and gas can be collected continuously while preventing gases collected one after another from mixing with each other.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional gas sampling device, and FIG. 2 is a block diagram of a gas sampling device of the present invention. 11... Collection pipe, 16... Liquid supply pipe, 17...
...Solenoid valve, 18...Liquid stopper.

Claims (1)

[Claims] 1 Connect a liquid supply pipe that supplies a liquid in which the analysis gas is difficult to dissolve to form a liquid stopper that intermittently partitions the aspirated gas to the collection tube that suctions the gas to be collected, and A continuous gas sampling device, characterized in that the pipe is provided with a valve that intermittently supplies the liquid.