JPS5821694B2 - gas sampling device - Google Patents

Description

Detailed Description of the Invention For example, in an activated sludge treatment facility, settled sludge from a settling tank is returned to raw sewage flowing into an aeration tank and mixed and aerated, so that organic matter in the sewage is decomposed by microorganisms. I have to.

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 gas 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 flowing therein; a float provided on the gas collection container to float the gas collection container above the liquid; The gas sampling container is equipped with a gas outlet provided to guide the sample gas sampled into the analyzer to the analyzer, and the sample gas sampled in the gas sampling container is guided through the gas outlet by the gas pressure of the sample gas itself. Gas sampling devices have already been proposed which are designed to be led out of the gas sampling vessel.

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, so the positional stability of the gas sampling device is poor, and the excess sample gas 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 amount of leakage.

The present invention was made in view of these points, and in this type of gas sampling device, the sample gas collected in the gas sampling container is sent to the analyzer through the gas outlet at a substantially constant gas pressure (positive pressure). It is an object of the present invention to provide a gas sampling device configured to be able to be guided and to be able to change the delivery pressure of its sample gas depending on the pressure loss of the gas processing equipment to which the gas sampling device is connected. do.

This purpose, according to the invention, is to provide a gas sampling device of this type in which a gas discharge tube for discharging the excess sample gas sampled is inserted into the gas sampling container, and the length of this insertion can be varied. This is achieved by configuring.

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 present invention, the gas collection container is formed by a cylindrical body whose upper end is closed, and an annular float is provided along the outer circumferential surface or the inner circumferential surface of this cylindrical body, Similarly, the blockage is provided with a surplus gas release pipe and a gas extraction conduit.

Furthermore, according to the invention, a guide mechanism is provided which allows the gas collection container to be raised or lowered at its predetermined location in response to variations in the liquid level, if it is necessary to sample the gas in a given case.

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

FIG. 1 is a schematic cross-sectional view of one 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. and an annular flow pipe (B) attached along the inner circumferential surface of the gas collection container (A).

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

When the bubbles V 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 that of the gas sampling vessel A.

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.

Moreover, this gas discharge pipe R is constructed so that its insertion length H can be changed via the support member X and the sealing gasket U.

As mentioned above, in the present invention, the amount of bubbles (2) 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. Since the design is designed to It is pushed up and the internal chamber Y is expanded.

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.

As a result, 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, H20.

Note that Z indicates the liquid level when the gas outlet pipe 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 sample gas to the gas analyzer (2) by the flow indicated by the arrow.

By the way, the specified flow rate for the gas analyzer ■, for example, 1 (1
In order to flow a sample gas of 3/min, l, the gas analysis system connected to the gas analyzer must have a flow rate of l (l/m1n).
) The sample gas in the gas sampling device must have the total sample gas delivery pressure of the pressure loss that occurs when the sample gas flows.

In the present invention, in order to make the sample gas in the gas sampling device have a desired gas pressure,
The structure is such that the insertion length H can be changed.

Therefore, the gas pressure of the sample gas is
pressure HCln1rLH20] based on the insertion length H of .

After this pressure H (mmH20) is set, the gas discharge pipe R is fixed.

In addition, in the present invention, since the gas discharge pipe R is simultaneously provided with the function of releasing excess gas accumulated in the internal chamber Y, the lower end RV of the gas discharge pipe R is required to be lower than the lower end BV of the float B. It is positioned above the body.

In this way, 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(+mH2O:)
Since the bubbles are sent out by the gas analyzer 1, there is no need to use a suction pump, and therefore there is no risk of sucking up liquid such as dirty water to collect bubbles, and there is also no risk of sucking up water in the drain pot.

4. When using the gas collecting device according to the present invention,
As mentioned above, since there is no need to install a pump, the configuration of the gas analysis system can be extremely simple, and there is no need to maintain the pump, which can be extremely effective in industrial use. .

At that time, insert an excess gas release pipe into the gas sampling 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.

Moreover, in this case, the insertion length H of the gas discharge pipe R is configured to be variable, so that it can be adjusted according to the pressure loss in the gas processing equipment, such as the filter and dehumidifier, of the gas analysis system to which the gas sampling device is connected. can change the gas pressure of the sample gas.

Furthermore, when a gas sampler is fixedly placed at a fixed location, air in the atmosphere is sampled when the liquid level drops below the lower end of the gas sampler, but in the present invention, As described above, since the gas collection container is configured to follow changes in the liquid level using the 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 present invention.

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

Air bubbles in the liquid enter the annular internal chamber Y1 of this gas collection 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 extraction conduit C to prevent water droplets from entering the sample gas guided to the analyzer.

Note that the lower end RV of the gas discharge pipe R is connected to the gas collector A.
It is inserted so that it is located above the lower end AV of 1.

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, the guide wire N1. Guide cylinder Q1 for guiding N2. Q2 is provided.

Therefore, the gas sampling device D4 is connected to these two guide wires N1.
．． It moves up and down along N2 according 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 extremely simplified.

Furthermore, a surplus gas release pipe was inserted into the gas collection container, and the surplus gas accumulated in the internal chamber was released into the atmosphere through this gas release pipe, so the position of the gas collection container relative to the liquid level was adjusted. Stability can be increased.

Moreover, the insertion length of the gas discharge tube is configured to be variable, and the gas pressure of the sample gas in the gas sampler can be changed, making it possible to compensate for pressure loss in the gas processing equipment of the gas analysis system. Can be done.

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 becomes extremely high, a situation may arise in which the sampled gas cannot be sent to the analyzer using only the gas pressure in the gas sampling device.

Therefore, in such cases, a pump must be used to send the sampled gas to 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 suction action of the pump.

In other words, when suctioning with a pump, if the suction amount of the pump becomes larger than the amount of sample gas entering the gas sampling vessel, the atmosphere will be released through the excess gas discharge pipe R. This is because it is automatically drawn into the gas extractor, thereby preventing waste water from being sucked up via the gas extraction conduit C.

Similarly, by suctioning the atmosphere 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 from each other of the present invention. FIG. 1 is a schematic configuration diagram of an example. A, AI...Gas collection container, B, B1. B2・
...Float, C...Gas extraction conduit, D
, I) 1°B2, B3, B4...Gas extractor, y, yi. Y2...Inner chamber, L...Splash prevention plate,
R: Excess gas release pipe, X: Support member, U: Tool seal.

Claims (1)

[Scope of Claims] 1. A gas sampling container having an opening facing the liquid in order to collect a sample floating in the form of bubbles from the liquid, and a gas sampling container for floating the gas sampling container above the liquid. a float attached to the gas collection container; a gas outlet provided to guide the sample gas collected in the gas collection container to an analyzer; a gas discharge tube inserted into the gas collection container to release the sample gas, and configured so that the insertion length of the gas discharge tube can be changed, and the sample gas collected in the gas collection container A gas sampling device characterized in that the sample gas is guided out of the gas sampling container through the gas extraction port by the gas pressure of the sample gas itself. 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. gas sampling device. 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 in order to collect the sample gas rising from the liquid in the form of bubbles, and a gas collection container having an opening directed into the liquid to allow the gas collection container to float above said liquid. an attached float;
a gas outlet provided for guiding the sample gas collected in the gas collection container to the analyzer; and a gas outlet provided in the gas collection container for releasing excess sample gas collected in the gas collection container. and a guide mechanism provided so that the gas collection container can follow fluctuations in the liquid level at a predetermined position, the insertion length of the gas discharge tube being 1. A gas sampling device characterized in that the sample gas sampled in the gas sampling container is guided out of the gas sampling container by the gas pressure of the sample 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, a splash prevention plate is provided at the gas extraction port to prevent water droplets from entering the sample gas led out of the gas sampling container through the gas extraction port. A gas extractor characterized by being provided with.