JPH0439610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of the Invention> The present invention relates to a method in which a sampling valve of an analyzer, such as a process gas chromatobluff, is taken out from the analyzer body and installed near a sampling point where a fluid to be measured is sampled. The present invention relates to a remote sampling device that remotely samples a desired amount of the fluid to be measured.

<Prior art> Fig. 1 is a configuration explanatory diagram showing a conventional example of such a remote sampling device. A probe that guides the fluid to be measured, 3 a stop valve, 4 a separator that branches the introduced fluid into two directions and sends it out, 5 a filter, 6 first to sixth connection ports 6a to 6e and a measuring tube 6g.
sampling valves 7a, 7 which have a solid line connection state and a broken line connection state shown in FIG.
b is an analyzer main body 8 consisting of connection ports 6a and 6e, and an analyzer for, for example, a process gas chromatograph;
9 is a constant temperature bath which houses the separator 4, filter 5, and sampling valve 6 and keeps them at a predetermined temperature. Steam piping through which steam flows to maintain a predetermined temperature, 11 is a stop valve 3 and a separator 4
This is a connecting pipe that connects the two. In addition, connection pipe 7
a, 7b, probe 2, and connection pipe 11
is often steam traced to prevent the fluid being measured from solidifying. In the conventional example with such a configuration, the fluid to be measured sampled from the pipe line 1 via the probe 2 is transferred from the stop valve 3 to the connecting pipe 11 to the separator 4 to the filter 5 to the first connection port 6a of the sampling valve 6. 6th connection port 6f → metering tube 6g → 3rd connection port 6c → 2nd connection port 6b → 2nd vent V It flows through _two streams of filtration, and part of it is branched off by separator 4, and directly flows from separator 4 to first vent V. ₂ flows. In addition, the tar contained in this fluid to be measured is removed by adhering to the inside of the probe 2, and the contained mist etc. is sent directly to the first vent V ₁ by the separator 3. removed. Further, since the filter 5 has a function of removing particulates contained in the fluid to be measured, the measuring tube 6g is supplied with the fluid to be measured from which mist, particulates, etc. have been removed. This fluid to be measured is supplied to the connecting pipes 7a and 7b by driving the sampling valve 6.
The sample is transported by a carrier gas or the like flowing inside the analyzer body 8 and analyzed within the analyzer body 8.

However, in the above conventional example, there is no means to limit the amount of sampled fluid to be measured, so if there is a lot of tar or coal in the fluid to be measured, a large amount of tar or the like will adhere to the inside of the probe 2, etc. There was a drawback that the introduction flow path for the fluid to be measured was blocked. For this reason, when the conventional remote sampling device as described above is used, there is a major problem in that it becomes extremely difficult to perform stable sampling over a long period of time.

<Object of the Invention> The present invention has been made in view of such a situation, and its object is to provide a remote sampling device that can perform stable sampling over a long period of time.

<Summary of the Invention> The present invention is characterized by a separator that branches the measured fluid into a first direction leading to a sampling valve disposed near a measured fluid sampling point and a second direction in a remote sampling device. 2, which has a predetermined internal volume calculated in advance.
This is because two tanks are provided, and flow path opening/closing valves are provided upstream and downstream of these tanks, respectively.

<Example> Hereinafter, the present invention will be described in detail using figures. FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention,
In the figure, the same symbols as in FIG. 1 are used with the same meaning, and repeated explanation will be omitted here. Also, 12
a, 12b are first and second tanks each having a predetermined internal volume calculated in advance;
13a is a first valve which is a normally open automatic opening/closing valve disposed between the first tank 12a and the separator 4 outside the thermostatic chamber 9, and 13b is a second connection port 6 between the second tank 12b and the sampling valve 6.
A second valve 14a, which is a normally open automatic opening/closing valve, is disposed outside the thermostatic chamber 9 between the
14a is a third valve that is a normally closed automatic opening/closing valve that is disposed between the first tank 12a and the first vent _V1 , and 14a is a third valve that is disposed between the second tank 12b and the second vent _V2 . The fourth valve is a normally closed automatic open/close valve. Note that the internal volume of the first tank 12a is the internal volume of the flow path from the tip of the probe 2 to the separator 4 (for example, 500 c.c.)
It is designed to be larger (for example, about twice as large). Moreover, the internal volume of the second tank 12b is
Separator 4→first connection port 6a of sampling valve 6→sixth connection port 6f→metering tube 6g→third connection port 6c→second connection port 6b (for example,
100c.c.) so that it becomes larger (for example, about twice as much)
Designed. Furthermore, the first to fourth valves 13
a, 13b, 14a, and 14b are configured to perform on/off operations according to control signals from a sequencer or the like (not shown).

In the embodiment of the present invention having the above-described configuration, the stop valve 3 is first opened, and the first to
The fourth valves 13a, 13b, 14a, and 14b are turned on. Therefore, the first and second valves 13a, 13b are closed, the third and fourth valves 14a, 14b are opened, and the tank 12 is closed.
The pressures at a and 12b are balanced to atmospheric pressure. after that,
According to the command from the sequencer etc., the first to fourth
When the valves 13a, 13b, 14a, and 14b of
Connection pipe 11 → separator 4 → first valve 13
a, flows into the first tank 12a, and part of it is branched off at the separator 4, and flows from the filter 5 to the first connection port 6a of the sampling valve 6.
6th connection port 6f → measuring tube 6g → 3rd connection port 6c →
Via the second connection port 6b → second valve 13b,
It flows into the second tank 12b. In this state, when the sampling valve 6 is turned on, the valve 6
The internal flow path is switched from the solid line connection state shown in FIG. 2 to the broken line connection state. Therefore, the fluid to be measured in the metering tube 6g is transported to a separation column (not shown) or the like in the analyzer main body 8 and analyzed by the carrier gas flowing in the connecting pipes 7a and 7b. After the first analysis is completed in this way, the sampling valve is turned off and the state of connection shown in the solid line in FIG. 1 is restored. Similarly, the above series of operations is repeated to perform the next analysis. Note that the present invention is not limited to the above-described embodiments, and can be modified in various ways. For example, the tanks 12a and 12b may be integrated into one tank.

<Effects of the Invention> According to the embodiment of the present invention as described in detail above, the fluid to be measured is sampled into the tanks 12a and 12b, each having an internal volume calculated in advance based on the volume of the piping line. Because of this configuration, unlike the conventional example described above, there is an advantage that only the minimum necessary amount of the fluid to be measured can be collected from the conduit 1. Therefore, the amount of tar etc. adhering to the inner wall surface of the probe 2 is significantly reduced compared to the case of the conventional example.
Ultimately, it becomes possible to perform stable sampling over a long period of time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of a conventional remote sampling device, and FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention. 1...Pipe line, 2...Probe, 3...Stop valve, 4...Separator, 5...Filter, 6
...Sampling valve, 6g...Measuring tube, 8...
...Analyzer body, 10...Steam piping, 13a,
13b, 14a, 14b...Valve, 12a, 1
2b...Tank.

Claims (1)

[Claims] 1. A sampling valve taken out from the analyzer body and disposed near a sampling point of the fluid to be measured; a separator that branches the collected fluid to be measured into a first direction and a second direction leading to the sampling valve; first and second tanks having predetermined internal volumes determined by calculation; a first valve that is disposed between the first tank and the separator and opens a flow path when energized; and the sampling a second valve that is disposed between the valve and the second tank and opens a flow path when energized; and third and third valves that are disposed downstream of the first and second tanks and that open a flow path when energized. 4 valves, and has first to sixth connection ports and a measuring tube having a predetermined internal volume, the first connection port is connected to the separator via a filter, and the second connection port is connected to the separator through a filter. 2 valves, and the fourth and fifth connection ports are switching valves connected to the analyzer body, and the sampling valve is constituted by a remote sampling device.