JP2004108952A - Gas sampling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To analyze continuously a component in exhaust gas. <P>SOLUTION: This gas sampling device has a chamber for storing gas having a gas inlet connected to a pipe wherein the gas flows, and a means for increasing or decreasing the chamber volume. The means for increasing or decreasing the chamber volume is a means moving along the chamber inner wall. The chamber is formed by a deformable bag, and the means for increasing or decreasing the chamber volume is a pump for introducing the gas into the bag. The chamber is also equipped with a gas exhaust port connected to an analytical means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas sampling device, and more particularly to a sampling device for exhaust gas requiring analysis.
[0002]
[Prior art]
The waste is incinerated in an incinerator, decomposed by heat and separated into incineration gas and residue. The incineration gas is subjected to chemical treatment, filter collection, etc. to render it harmless. Finally, the detoxified exhaust gas is released to the atmosphere through the flue. This is proposed, for example, in JP-A-2002-139409.
[0003]
The composition of the waste is not constant when it is put into the furnace, and it is difficult to make it constant. For this reason, it is necessary to inspect the components of the exhaust gas immediately before entering the flue, and to control the incineration or detoxification of the incinerated gas based on the fluctuation of the value.
[0004]
That is, in the processing, the gas processing apparatus must be controlled according to the change in the gas composition.
[0005]
[Problems to be solved by the invention]
A gas analyzer may be used to detect a change in gas composition.However, some gas analyzers require a certain amount of time to determine the analysis value depending on the element to be measured. During this time, the incineration gas flows out, so that a blank time occurs in which unanalyzed gas flows. To compensate for this, there is a demand for a measurement method or a simple device that can be measured in a short time or that does not cause a blank time.
[0006]
When analyzing elements that require a long time for analysis, the apparent blank time is shortened by using a plurality of analytical instruments, but the analytical instruments are often expensive and require frequent maintenance. New problems arise.
[0007]
[Means for Solving the Problems]
The gas sampling apparatus according to the present invention is characterized by comprising a gas storage chamber having a gas inlet connected to a pipe through which the gas flows, and a means for increasing or decreasing the volume of the chamber.
[0008]
The means for increasing or decreasing the volume of the chamber is means for moving along the inner wall of the chamber.
[0009]
The chamber is formed by a deformable bag, and the means for increasing or decreasing the volume of the chamber is a pump for introducing gas into the bag.
[0010]
The chamber is further provided with a gas outlet connected to the analysis means.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
In the present invention, as shown in FIG. 1, a specific gas flowing through a smoke guide or a gas blower tube 1 is sampled, for example, for 30 minutes, using a gas sampler, for example, a fluorocarbon gas per hour. The part is sent to the analysis sampler 3 and analyzed by, for example, gas chromatography 4 of FID (hydrogen flame ionization detector) method to measure the concentration of the specific gas and to include the specific gas in the gas blower tube 1 at the same time. The flow rate of the entire gas is continuously measured by a flow meter 5 such as a vortex flow meter, and the flow rate of the specific gas is obtained from the obtained concentration of the specific gas and the flow rate of the entire gas.
[0013]
As the gas sampler 2, for example, a gas sampler is extracted through a gas introduction pipe 8 by gradually expanding the volume of a chamber of a cylinder 7 by a piston 6. In this case, it is more preferable to control the amount of movement of the piston so that the temperature is corrected so that the sampling amount per time is constant.
[0014]
In such a gas sampler 2, when the chamber is gradually expanded by the movement of the piston 6, the sampled gas circulates in the chamber, causing a stirring effect, and a gas sample having a uniform composition is generated.
[0015]
As the gas sampler 2, a gas sampler having a deformable bag shape and a pump for introducing gas into the bag shape may be used.
[0016]
When the volume of the gas introduction pipe 8 is large and the amount of gas remaining in the gas introduction pipe 8 exceeds the chamber capacity, the inside of the chamber is filled with the gas in the gas introduction pipe and flows through the gas blower pipe 1. Since the gas cannot be sucked at any time, it is desirable to adjust the length and thickness of the gas introduction pipe 8 to minimize the volume.
[0017]
When the capacity of the gas introduction pipe exceeds the capacity of the chamber due to the structure and installation location of the gas blow pipe 1, a spare chamber may be provided in front of the chamber, or a bypass pipe or a suction device may be additionally provided between the gas introduction pipe and the gas blow pipe. Is provided, the amount of gas suction into the chamber can be controlled regardless of the capacity of the gas introduction tube.
[0018]
When the sampling amount reaches a predetermined amount, the gas valve is controlled, the piston 6 of the gas sampler 2 is quickly pushed back, and the gas is discharged. The gas is once stored in the analysis sampler 3 and analyzed.
[0019]
In addition, depending on the gas component, the inside of the pipe may be clogged with the deposit. In the case of such a gas component, a flushing device is arranged in the path so that the deposit can be removed by air as appropriate. I do. The flushing effect can be achieved at the same time by discharging (outflowing) the gas at a stretch by the gas sampler 2.
[0020]
The analysis time by the gas chromatography 4 is, for example, 30 minutes in the case of Freon, and the gas is immediately discharged to the gas blower pipe 1 after the analysis.
[0021]
【The invention's effect】
As described above, according to the gas sampling apparatus of the present invention, since the gas sampler is used, it is possible to observe the exhaust gas component almost continuously, and there is a great advantage that the control of the exhaust gas becomes easier.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a gas sampling device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blower tube 2 Gas sampler 3 Sampler for analysis 4 Gas chromatography 5 Flow meter 6 Piston 7 Cylinder 8 Gas inlet tube

Claims (4)

A gas sampling device comprising: a gas storage chamber having a gas inlet connected to a pipe through which the gas flows; and a means for increasing or decreasing the volume of the chamber. 2. The sampling apparatus according to claim 1, wherein the means for increasing or decreasing the volume of the chamber is means for moving along the inner wall of the chamber. 2. The gas sampling apparatus according to claim 1, wherein the chamber is formed by a deformable bag, and the means for increasing or decreasing the volume of the chamber is a pump for introducing gas into the bag. 3. The gas sampling apparatus according to claim 1, wherein the chamber further includes a gas outlet connected to the analysis unit.

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