JPS5920681Y2 - sample collection device - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a sample collection device.

More specifically, the present invention relates to a device for collecting a small amount of a liquid containing at least a portion of a component that easily gasifies, such as a liquid in which a gas is dissolved or a liquefied gas.

Conventionally, this type of apparatus has been used, for example, when analyzing the composition of PG (liquefied petroleum power) by subjecting it to gas chromatography.

Such conventional devices are typically configured to collect a portion of the liquid being tested while flowing through it.

This is because a sample collected while the test liquid is flowing has less variation from the original composition than a sample collected without flowing the test liquid, and there is less variation in measured values.

However, if the flow rate of the test liquid is increased too much, small air bubbles will be mixed into the collected sample.

This is because the pressure of the liquid to be tested decreases and some components gasify in the liquid before being sampled.

A sample containing such small bubbles has a composition different from the original one, and the sample amount is also inaccurate, resulting in a large measurement error.

Therefore, it is most desirable to sample the liquid while flowing it at an appropriate flow rate.

However, with conventional sample collection devices, there is no way to check whether the flow rate is appropriate.

In other words, even if the flow rate is too low or too high, samples are taken without knowing this.

Therefore, it appears that samples were collected in inappropriate conditions.

In fact, there is considerable variation in the measured values of samples taken with conventional devices.

This invention was made in order to eliminate the drawbacks of the conventional devices described above, and provides an improved sample collection device that can reliably set a proper flow rate and collect a sample using simple means and operations.

That is, according to this invention, a sampling section and at least a part of the wall surface are transparent, and a pipe through which a liquid to be measured consisting of a liquid containing dissolved gas or a liquefied gas can flow is provided. A monitor section, which is a small room where you can see the inside,
A sample collecting device is provided in which the flow rate adjusting section is connected in this order from upstream.

This invention will be explained in detail below based on the embodiment shown in the figures.

1 is an embodiment of the sample collecting device of this invention.

A sampling section 3, a monitor section 4, and a flow rate adjustment section 5 are successively arranged in this order from the upstream side of a conduit 2 connected to a test liquid container T via a flow path resistance R.

6 is a discharge path, and 7 is a sample collection path. Sampling section 3
Specifically, it is a hexagonal cock as shown in FIG. 2, for example.

Since they are normally in communication as shown by solid lines, the test liquid flows in the order of pipe 2, pipe 10, and pipe 8.

At the time of collection, it is switched as shown by the dotted line, and the pipe line 10
is inserted between the carrier gas introduction path 9 and the sample sampling path 7.

Approximately 0.1 to 50 .mu.l of the liquid to be tested in the conduit 10 is then transferred as a sample to the gas chromatograph using the carrier gas.

Although not shown, the gas chroma I graph is connected to the sample collection path 7.

Specifically, the monitor section 4 is a cylinder whose side wall 11 is made of transparent glass and whose lower wall 12 and upper wall 13 are made of stainless steel, as shown in FIG. 3, for example.

An introduction pipe 14 is inserted into the center of the lower wall 12, and the upper wall 13
A delivery pipe 15 is installed in the center of the pipe.

The flow rate adjustment section 5 is a variable flow path resistance such as a needle valve, for example.

Normally, the flow rate is zero, that is, the state is shut off.

When collecting a sample, first, the flow rate regulator 5 is appropriately operated to allow the liquid to be tested to flow.

Then, the pressurized liquid to be tested flows forcefully into the monitor section 4 through the pipes 2 and 10.8.

This situation is shown in FIG. 4a, where the easily gasified components contained in the liquid to be tested are actively gasified.

After a while, the monitor section 4 is filled with the liquid to be tested, but some of its components are still gasified, and small bubbles are observed as shown in FIG. 4B.

At this point, when the flow rate adjustment section 5 is slightly throttled, the pressure inside the monitor section 4 increases and small bubbles are no longer seen as shown in FIG. 4C.

A sample is collected by setting the flow rate adjusting section 5 to the state shown in FIG. 4C and then switching the sampling section 3 as described above.

If the setting of the flow rate adjustment section 5 is inappropriate, or if small bubbles are mixed in the liquid to be tested from the beginning, small bubbles will be observed in the monitor section 4, so do not collect the sample. , readjust the flow rate adjustment section 5 and inspect the flow path.

In this manner, according to the sample collecting device 1, sampling can be performed while reliably flowing the sample liquid at an appropriate flow rate, so that more accurate and error-free samples can be collected.

In addition, abnormalities such as small air bubbles being mixed into the sample liquid can also be detected.

Next, use this sample collection device 1 to actually collect a sample,
The results of analyzing the sample are shown.

The liquid to be tested is LPG.

Table 1 shows the measurement results of 10 samples taken with the flow rate regulator 5 set to achieve the condition shown in Figure 4C, Table 2 shows the measurement results of 8 samples taken under low flow conditions, and Table 3 shows the measurement results of 8 samples taken under low flow conditions. This is a statistical summary of the measurement results of 10 samples taken under excessive flow rates.

As is clear from Table 1.2.3, this sample collection device 1
In particular, the variation in ethane, normanbutane, and isopentane was significantly reduced, and this is considered to be the result of suitable sample collection.

Note that when no bubbles are observed in this sample collection device 1, it is not possible to know whether or not the sample liquid is flowing just by looking at the monitor section 4; If the condition is returned to the state shown in Figure 4, bubbles will be generated again and the flow of the sample liquid can be confirmed.

If bubbles do not occur even after adjusting the flow rate adjustment section 5, there is an abnormality in which a component that is easily gasified has already leaked out, so the flow path should be inspected.

Since this operation can check both the flow of the liquid to be tested and gas leakage abnormalities, it is desirable to perform this operation immediately before sampling the sample.

If you only want to check the flow of the liquid being tested,
It is sufficient to observe the flow of gas or liquid discharged from the discharge passage 6.

In addition to visual observation, the bubble state in the monitor unit may be checked using a photosensor that detects transmitted light or scattered light.

Examples of such photosensors include those of a type in which a light source and a light receiver are provided facing each other so that an optical axis passes through a flow path.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of the configuration of an embodiment of the sample collecting device of this invention, Fig. 2 is an explanatory diagram of the configuration of an example of the sampling section thereof,
FIG. 3 is an external perspective view of an example of the monitor section, and FIG. 4 is a schematic cross-sectional view of the monitor section shown in FIG. 3 for explaining the operation of the sample collecting device of this invention. 1... Sample collection device, 2,8.10...
・Pipe line, 3... Sampling section, 4...
・Monitor section, 5...Flow rate adjustment section, 7...
・Sample collection path, L...Test liquid.

Claims (1)

[Scope of utility model registration request] A sampling section and a monitoring section, which is a small chamber whose wall surface is at least partially transparent and whose interior can be seen through the transparent section, are arranged in a pipe line through which a liquid to be tested consisting of a liquid containing dissolved gas or a liquefied gas can flow. and a flow rate adjustment section are arranged in series from upstream in this order.