JPS5821693B2 - gas sampling device - Google Patents

Description

Detailed Description of the Invention For example, in an activated sludge treatment facility, aeration is performed; the settled sludge from the settling tank is returned to the raw sewage flowing into the tank, mixed and aerated, and the organic matter in the sewage is decomposed by microorganisms. That's what I do.

An air pipe is immersed in the aeration tank to aerate the mixed wastewater, and air or oxygen is sent into the mixed wastewater through the air pipe.

At that time, the activity status of microorganisms can be determined by collecting air bubbles that float up from the wastewater and observing the amount of oxygen reduction in the gas.

The present invention relates to a gas sampling device for sampling gas passing through such wastewater in the form of bubbles, for example.

Conventionally, a bell-shaped gas collection container is installed in the wastewater, and the gas that rises up from the wastewater in the form of bubbles is collected inside the container, and the gas is guided to a gas analyzer after being dust- and moisture-proofed. Gas analysis systems are known.

By the way, in this conventional gas analysis system, a suction pump is provided in the gas flow path after the gas sampling container in order to guide the sample gas collected in the sampling container to the gas analyzer.

However, due to the action of this suction pump, there is a risk that sewage or water in the drain pot may be sucked up, which requires a protective device to prevent this suction, and also requires maintenance of the pump. .

In order to solve these problems, the applicant has developed a gas sampling device that allows sample gas to be sent to a gas analyzer without using a pump. a gas collection container having an opening directed into the liquid for collecting a sample gas; a float provided on the gas collection container to float the gas collection container above the liquid; and a gas outlet provided to guide the sample gas collected in the container to the analyzer. A gas sampling device has already been proposed which is designed to be led out of the gas sampling container.

However, in this gas sampling device, the excess sample gas collected in the gas sampling container leaks from the outer surface of the lower end of the gas sampling container. The disadvantage is that the gas pressure of the sample gas itself, which is led to the analyzer via the gas outlet, fluctuates significantly depending on the leakage amount of the sample gas.

The present invention has been made in view of these points, and in this type of gas sampling device, the sample gas collected in the gas sampling container is passed through the gas outlet at a substantially constant gas pressure (positive pressure) to the analyzer. It is an object of the present invention to provide a gas extractor configured to be able to be guided by a gas collector.

This object is achieved according to the invention in a gas sampling device of this type by inserting into the gas sampling vessel a gas discharge tube which discharges the excess sample gas sampled.

The shape of the gas discharge pipe may be cylindrical or square, and the gas collection container may be a bell-shaped container or a cylindrical container such as a cylinder or a square tube.

Therefore, according to one embodiment of the present invention, the gas collection container is formed, for example, in the shape of a cylinder whose upper end is closed, a float is provided in the center of the cylinder, and an excess gas discharge pipe is provided in the closed part. and a gas extraction conduit for guiding the sampled gas to the analyzer.

According to another embodiment of the invention, the gas collection container is formed, for example, by a cylindrical body whose upper end is closed, and an annular float is provided along the outer or circumferential surface of this cylindrical body, and a similar A surplus gas release pipe and a gas extraction conduit are provided in the closed portion.

Furthermore, according to the invention, when it is necessary to sample gas at a predetermined location, a guide mechanism is provided that allows the gas collection container to be raised or lowered at the predetermined location in response to fluctuations in the liquid level.

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic sectional view of an embodiment of the present invention.

The gas sampling device is a cylindrical gas sampling container A that has an opening facing the liquid and is closed at the upper end in order to collect sample gas that floats up from the liquid in the form of bubbles V. and an annular float B attached along the inner peripheral surface of the gas collection container A.

By configuring the gas sampling container A and the float B integrally in this way, the gas sampling device can be made to follow changes in the liquid level W of sewage or the like.

When the bubbles (2) rise above the liquid level W, they are collected in the internal chamber Y of the gas collection container A as a sample gas.

When the sample gas accumulates in the internal chamber Y, the gas sampling device is pushed up above the liquid surface due to the relationship between the weight of the gas sampling device and its buoyancy.

In order to guide the sample gas to the gas analyzer, the gas sampling vessel A is provided with a gas extraction conduit C whose cross-sectional area is smaller than the cross-sectional area of its opening.

At that time, the internal chamber Y of the gas collection container A is
By designing the sample gas so that a large amount of bubbles (2) are collected, the sample gas collected is sent to the gas analyzer by the gas pressure of the sample gas itself.

In the present invention, a surplus gas release pipe R is further inserted into the gas collection container A.

As described above, in the present invention, the amount of bubbles V collected in the internal chamber Y of the gas collection container A is set to be larger than the amount of sample gas guided to the gas analyzer via the gas extraction conduit C. Because of the design, a large amount of sample gas accumulates in the internal chamber Y over time, and the gas pressure of the sample gas increases, pushing the gas sampling device slightly upwards from the state shown in the figure. and the internal chamber Y is enlarged.

Then, when the lower end RV of the gas discharge pipe R appears in the internal chamber Y, the sample gas in the internal chamber Y continues to flow through the gas discharge pipe R until the lower end RV of the gas discharge pipe R comes into contact with the liquid surface W again. released into the atmosphere via.

Thereby, the gas sampler is again in the state shown, and the pressure of the sample gas guided to the gas analyzer via the gas extraction conduit C is maintained at an approximately constant positive pressure, i.e., HC20.

In addition, in this embodiment, the gas discharge pipe R has an internal chamber Y.
In order to have the function of releasing excess gas accumulated in the gas discharge pipe R, the lower end RV of the flow 1-B is connected to the lower end B of the flow 1-B.
It is positioned above V.

In other words, the height of the internal chamber Y is defined by the insertion length H of the gas discharge pipe R into the gas collection container A.

Note that Z indicates the liquid level when the gas extraction conduit C is opened to the atmosphere.

FIG. 2 is a flowchart of a gas analysis system using the gas sampling device according to the present invention.

In this Figure 2, E is a drain and mist separator, F is a dehumidifier, G is a filter, M is a flow meter,
■ is a gas analyzer, and K is a drain pot.

Bubbles in the liquid collected by the gas sampler are guided as a sample gas to the gas analyzer (2) by the flow indicated by the arrow.

Thus, according to the present invention, the sample gas is supplied from the gas sampling device to the gas pressure of the sample gas itself, for example, H[Wt1rLH2
0] is sent out by the gas analyzer ■, there is no need to use a suction pump, so there is no need to use a suction pump, which eliminates the risk of sucking up liquid such as sewage to collect air bubbles, and also eliminates the risk of sucking up water in the drain pot. It disappears.

Furthermore, when using the gas collecting device according to the present invention,
Since there is no need to install a pump as described above, the configuration of the gas analysis system can be extremely simplified, and maintenance of the pump is not required, which can have extremely large effects in industrial use. .

At that time, insert the excess gas released into the gas collection container,
The structure is configured so that the excess sample gas accumulated in the internal chamber is released into the atmosphere through this gas release pipe, which increases the positional stability of the gas sampling container with respect to the liquid level. The gas pressure of the sample gas delivered to the gas analyzer via the conduit can be kept approximately constant.

・Furthermore, when a gas sampling device is fixedly placed at a fixed location, when the liquid level drops below the lower end of the gas sampling device, air in the atmosphere is sampled. As mentioned above, since the gas sampling container is configured to be able to follow changes in the liquid level using a float, there is no risk of sampling air from the atmosphere even if the liquid level changes.

FIG. 3 is a schematic cross-sectional view of another embodiment of the invention.

In the gas sampling device D1 shown in this embodiment, a float B1 is attached to the center of a bottomed cylindrical gas sampling container A1.

Air bubbles in the liquid are contained in the annular internal chamber of this gas sampling container A1.
is collected as a sample gas.

Further, in this embodiment, a splash prevention plate is provided at the inlet end of the gas outlet conduit C in order to prevent water droplets from entering the sample gas guided to the analyzer.

Note that the surplus gas release pipe R is inserted into the gas collection container A1, and its lower end RV is positioned above the lower end AV of the gas collection container A1.

FIG. 4 is a schematic diagram of still another embodiment of the present invention.

In this embodiment, the float B1 shown in FIG. 3 is formed into an annular cylindrical body B2, and a guide wire N is inserted into the annular interior P of this cylindrical body B2.

Therefore, the gas sampling device D2 consisting of the gas sampling container A1 and the float B2 can be moved up and down at a predetermined position along this guide wire N in response to changes in the liquid level.

FIG. 5 is a schematic diagram of still another embodiment of the present invention.

The gas sampling device D3 shown in this embodiment is provided with a guide tube Q for guiding the guide wire N to the gas sampling container A shown in FIG.

Therefore, the internal chamber 2 of the gas collection container A is formed in an annular shape.

FIG. 6 is a schematic diagram of still another embodiment of the present invention.

In the gas sampling device D4 shown in this embodiment, guide cylinders Ql and Q2 for guiding guide wires N1 and N2 are provided on the outer peripheral surface of the gas sampling container A.

Therefore, the gas sampling device D4 is connected to these two guide wires N1.
, N2, it moves up and down in response to fluctuations in the liquid level.

As explained above, in the present invention, a float is added to the gas collection container, and the sample gas collected in the gas collection container is collected via the gas outlet by the gas pressure of the sample gas itself. Since it is configured so that it is drawn out of the container, there is no need to provide a suction pump.
Therefore, the configuration of the gas analysis system can be compared extremely easily.

Furthermore, an excess gas release pipe was inserted into the gas sampling container, and the excess sample gas accumulated in the internal chamber was released into the atmosphere through this gas release pipe, so that Positional stability can be increased.

In addition, in the above description, it was stated that by using the gas sampling device of the present invention, there is no need to install a pump in the gas analysis system.

However, when using an analyzer with an extremely large gas pressure loss, such as a magnetic oxygen analyzer that uses an interfacial pressure difference, or when using a filter or dehumidifier, the gas flow path at the front stage of the analyzer may be If the pressure loss of the gas is extremely high, a situation may arise where the gas pressure in the gas sampling device alone is insufficient to send the sampled gas to the analyzer.

Therefore, in such cases, a pump must be used to pump the sample gas into the analyzer.

However, in the present invention, even when a pump is used, there is no risk that sewage or water in the drain pot will be sucked up by the pump's suction action.

In other words, when suctioning with a pump, if the amount of sample gas being sucked by the pump becomes larger than the amount of sample gas entering the gas sampling device, atmospheric air is automatically removed through the excess gas discharge pipe R. This is because waste water is prevented from being sucked into the gas sampling device and thereby being sucked up via the gas extraction conduit C.

Similarly, by suctioning atmospheric air through the excess gas discharge pipe R, sucking up water in the drain pot is also avoided.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an embodiment of the present invention, Fig. 2 is a flowchart of a gas analysis system when using an embodiment of the present invention, and Figs. 3 to 6 are different implementations of the present invention. It is a schematic block diagram of an example. A, AI...Gas collection container, B, B1. B2・
... Float, C ... Gas outlet pipe, D
, D.I. D2, D3, D4...Gas sampling device, L
...Splash prevention plate, R... Surplus gas release pipe, Y, Yl, Y2...Inner chamber, W...
·Liquid surface.

Claims (1)

[Scope of Claims] 1. A gas collection container having an opening directed into a liquid for collecting a sample floating from the liquid in the form of bubbles, and for floating the gas collection container above the liquid. A float attached to the gas collection container, a gas outlet provided for guiding the sample gas collected in the gas collection container to an analyzer, and an excess sample collected in the gas collection container. a gas release pipe inserted into the gas collection container to release gas, the sample gas collected in the gas collection container is transferred to the gas outlet through the gas outlet by the gas pressure of the sample gas itself. A gas sampling device characterized in that the gas is configured to be led out of the gas sampling container. 2. The gas sampling device according to claim 1, wherein the gas sampling container is formed into a cylindrical body, and a float is attached to the center of the cylindrical body. 3. The gas sampling device according to claim 1 is characterized in that the gas sampling container is formed into a cylindrical body, and an annular float is attached along the outer circumferential surface or the inner circumferential surface of the cylindrical body. A device for collecting gas. 4. In the gas sampling device according to any one of claims 1 to 3, the gas extraction port has a gas sample gas led out to the outside of the gas collection container through the gas extraction port. A gas sampling device characterized by being equipped with a splash prevention plate to prevent water droplets from entering. 5. A gas collection container having an opening directed into the liquid for collecting the sample gas floating in the form of bubbles from the liquid, and a gas collection container having an opening directed into the liquid to allow the gas collection container to float above the liquid. with a float attached;
a gas outlet provided for guiding the sample gas collected in the gas collection container to an analyzer; and a gas extraction port provided in the gas collection container for releasing excess sample gas collected in the gas collection container. a gas discharge pipe inserted into the gas collection container; and a guide mechanism provided so that the gas collection container can follow changes in the liquid level of the heavy equipment liquid at a predetermined position. 1. A gas sampling device characterized in that the collected sample gas is led out of the gas sampling container by the gas pressure of the sample gas itself. 6. The gas sampling device according to claim 5, wherein the gas sampling container is formed into a cylindrical body, and a float is attached to the center of the cylindrical body. 7. The gas sampling device according to claim 5 is characterized in that the gas sampling container is formed into a cylindrical body, and an annular float is attached along the outer circumferential surface or the inner circumferential surface of the cylindrical body. gas sampling device. 8. In the gas sampling device according to claim 5, the gas is discharged through the gas outlet; water droplets are prevented from entering the sample gas led out of the gas sampling container. A gas sampling device characterized by being equipped with a splash prevention plate to prevent splashing.