JP4116378B2 - Gas sampling analyzer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas sampling analyzer , and more particularly, to an exhaust gas sampling analyzer that requires analysis .
[0002]
[Prior art]
Waste is incinerated in an incinerator, decomposed by heat, and separated into incineration gas and residue. Incineration gas is treated with chemicals and filters to make it harmless. Eventually, detoxified exhaust gas is released to the atmosphere through the flue. This is proposed, for example, in Japanese Patent Laid-Open No. 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 treatment of the incineration gas by the fluctuation of the value.
[0004]
That is, in the processing, the gas processing apparatus must be controlled in accordance with changes in the gas composition.
[0005]
[Problems to be solved by the invention]
A gas analyzer or the like may be used to detect a change in the composition of the gas. However, some gas analyzers require a certain amount of time until the analytical value is determined depending on the element to be measured. Since the incineration gas is flowing out even during the time, a blank time occurs in which the unanalyzed gas flows. In order to compensate for this, a measurement method or a simple apparatus that can measure in a short time or does not cause a blank time is desired.
[0006]
When analyzing elements that require time for analysis, the use of multiple analytical instruments will reduce the apparent blank time, but analytical instruments are often expensive and maintenance is frequent. New problems arise.
[0007]
[Means for Solving the Problems]
The gas sampling analyzer of the present invention comprises a gas storage chamber having a capacity larger than the capacity of the gas introduction pipe connected to the gas blower pipe via the gas introduction pipe, and gradually increasing the volume of the chamber. Means for sampling a predetermined amount of gas from the blower pipe and circulating it in the chamber; a gas exhaust pipe independent of the gas introduction pipe connecting the gas exhaust port of the chamber and the gas blower pipe; and And an analysis means connected to a gas exhaust pipe and receiving and analyzing a part of the sampled gas sent by reducing the volume of the chamber.
[0008]
The means for increasing / decreasing the volume of the chamber is a means for moving along the inner wall of the chamber.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
In the present invention, as shown in FIG. 1, a specific gas flowing in a smoke guide or gas blower pipe 1 is sampled, for example, by using a gas sampler 2, for example, chlorofluorocarbon gas for a fixed amount per hour, for example, for 30 minutes. The specific gas in the gas blower pipe 1 is included at the same time as the concentration of the specific gas is measured by sending the part to the analysis sampler 3 and analyzing by, for example, the gas chromatography 4 of the FID (hydrogen flame ionization detector) system The flow rate of the specific gas is continuously measured by the 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 whole gas.
[0013]
As the gas sampler 2, for example, one that collects exhaust gas through the gas introduction pipe 8 by gradually expanding the volume of the chamber of the cylinder 7 by the piston 6 is used. In this case, it is more preferable to perform temperature correction and control the moving amount of the piston so that the sampling amount per time becomes constant.
[0014]
In such a gas sampler 2, when the chamber is gradually expanded by the movement of the piston 6, the sampled gas is circulated in the chamber, producing a stirring effect and generating a gas sample having a uniform composition.
[0015]
As the gas sampler 2, a bag-shaped one that is deformed and a pump that introduces gas into the bag may be used.
[0016]
When the volume of the gas introduction pipe 8 is large, if the amount of gas staying 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 reduce the volume as much as possible.
[0017]
When the capacity of the gas introduction pipe exceeds the chamber capacity due to the structure or installation location of the gas blower pipe 1, a spare chamber is provided in front of the chamber, or a bypass pipe or a suction machine is further provided in the gas introduction pipe and the gas blower pipe. If this is provided, the amount of gas sucked into the chamber can be controlled regardless of the capacity of the gas introduction pipe.
[0018]
When the predetermined sampling amount is reached, the gas valve is controlled to quickly push back the piston 6 of the gas sampler 2 to discharge the gas. The gas is temporarily stored in the analysis sampler 3 for analysis.
[0019]
In addition, depending on the gas component, the inside of the pipe may be clogged with deposits. In the case of such gas components, a flushing device is arranged in the path so that the deposits can be removed appropriately by air. To do. The flushing effect can be achieved at the same time by releasing (outflowing) the gas at once with the gas sampler 2.
[0020]
The analysis time by the gas chromatography 4 is, for example, 30 minutes in the case of Freon, and is discharged to the gas blowing pipe 1 immediately after the analysis is completed.
[0021]
【The invention's effect】
As described above, according to the gas sampling analyzer of the present invention, since the gas sampler is used, it is possible to observe the exhaust gas component substantially continuously, and there is a great advantage that the exhaust gas control becomes easier.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a gas sampling analyzer of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air pipe 2 Gas sampler 3 Analytical sampler 4 Gas chromatography 5 Flowmeter 6 Piston 7 Cylinder 8 Gas introduction pipe

Claims (2)

A gas storage chamber having a capacity larger than that of the gas introduction pipe connected to the gas blow pipe via the gas introduction pipe, and a predetermined amount of gas is sampled from the blow pipe by gradually increasing the volume of the chamber. And a means for circulating in the chamber, a gas exhaust pipe connected to the gas blower pipe connected between the gas exhaust port of the chamber and the gas blower pipe, and a gas exhaust pipe connected to the gas exhaust pipe. A gas sampling analysis apparatus comprising: an analyzing means for receiving and analyzing a part of the sampled gas sent by reducing the volume.   2. The gas sampling analyzer according to claim 1, wherein the means for increasing / decreasing the volume of the chamber is a means for moving along the inner wall of the chamber.

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