JP2533709Y2 - Gasification sampling equipment for low temperature liquefied gas - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is intended to analyze components such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) and other low-temperature component mixtures. The present invention relates to a sampling device for gasification and sampling.

[Prior Art] Conventionally, as this kind of sampling apparatus, a pressure vessel type as shown in FIG. 2 is known. This known sampling device forms a vacuum sampling chamber 02 and a vacuum sample chamber 02 'surrounding it in a pressure-resistant container 01 made of a low-temperature material, and introduces pre-cooling heat so as to surround the sampling chamber 02. A tank 03 is formed, and at the time of sampling, first, for example, LNG is introduced into the pre-cooled liquid introduction tank 03 from its inlet 05 to cool the sampling chamber 02, and then the sampling valve 04 is opened and LNG is introduced by differential pressure. In order to perform quantitative analysis in the sample collection chamber 02, when performing analysis, warm water is introduced into the precooled liquid introduction tank 03 to heat the LNG, and gasified gas is supplied from the nozzle 06 to the vacuum sample chamber 02. ′, And the sample gas is taken out from the outlet 07 for analysis.

[Problems to be Solved by the Invention] a. The conventional sampling device described above directly collects the low-temperature liquefied gas into the vacuum sampling chamber 02 formed in the pressure-resistant container 01. When mixed, an accurate analysis value may not be obtained, or the analysis value may fluctuate each time.

b. Since the amount of sampling increases and decreases due to pressure fluctuations at the inlet of the device, skill is required to control the pressure fluctuations and collect a fixed amount.

c. Since it is collected in liquid form, it takes a lot of time and effort to vaporize from collection to analysis.

d. The sampling device is heavy due to its pressure-resistant structure, which is inconvenient to handle and transport.

e. Because of the vacuum specification, the production cost is high, and the maintenance and management of the equipment is complicated and time-consuming.

[Means for Solving the Problems] The technical means proposed to solve the above problems are as follows.

Coiled heat transfer tube 3 is placed in vaporization vessel 2 filled with hot water 4.
And the upper inlet 3 ′ of the heat transfer tube 3.
Is connected to the low-temperature liquefied gas introduction line 1, the lower outlet 3 ″ is raised in the vaporization vessel 2 and connected to the sample gas introduction line 8, for detecting the temperature in the hot water 4 in the vaporization vessel 2. A temperature sensor 6 and a thermometer 7 for displaying the temperature detected by the sensor 6 are provided. A position where the stirring rod 5 can be pulled out of the lower part of the heat transfer tube 3 from above in the coiled center of the heat transfer tube 3. The hot water is inserted into the heat transfer tube 3 so as to be freely stirred inside the coil of the heat transfer tube 3. A sampling gas cylinder connecting portion 21 is formed at the end of the sample gas introduction line 8, and the low temperature liquefied gas introduction line 1 is formed. A sampling gas cylinder connecting portion 22 is formed at the tip of the sample gas collecting line 11 connected to the low temperature liquefied gas collecting line 12, and the inlet 10 'of the sampling gas cylinder 10 is connected to the connecting portion 21. Connected, it is connected to an outlet 10 'in the connecting portion 22, the gasification sampling device for the low-temperature liquefied gas, characterized in.

[Operation] When the liquid to be analyzed is introduced from the low-temperature liquefied gas introduction line into the heat transfer tube, the sampling device is heated by hot water in the vaporization vessel and vaporized, and the vaporized sample gas passes through the sample gas introduction line. And introduced into the sampling gas cylinder. During vaporization, the stirrer is used to stir the hot water inside the coil of the heat transfer tube as needed, and the temperature is controlled by the temperature sensor 6 and the thermometer 7. When analyzing the introduced sample gas, an analyzer is connected to the inlet side of the sampling gas cylinder.

Embodiment FIG. 1 shows an embodiment of the present invention. 1 is a low-temperature liquefied gas introduction line to be sampled,
Reference numeral 2 denotes a vaporization vessel, into which a coil-shaped heat transfer tube 3 is vertically inserted, and an inlet 3 ′ of the heat transfer tube 3 is connected to the low-temperature liquefied gas introduction line 1. I have. Reference numeral 4 denotes hot water filled in the vaporization container 2, 5 denotes a stirring rod inserted from above into the coiled center of the heat transfer tube 3 for stirring the hot water, and 6 denotes a temperature of the hot water in the vaporization container 2. This is a temperature sensor for detection, and the temperature detected by the temperature sensor 6 is displayed on a thermometer 7.

Reference numeral 8 denotes a sample gas introduction line connected to the outlet 3 ″ of the heat transfer tube 3. The sample gas introduction line 8 branches off from the bypass line 9 on the way to the inlet 10 ′ of the sampling gas cylinder 10. I have.

Reference numeral 11 denotes a sample gas recovery line connecting the outlet 10 ″ of the sampling gas cylinder 10 and the low-temperature liquefied gas recovery line 12.

Reference numerals 12 ', 13, 14, 15, 16, and 17 denote valves, 18, 19, and 20 pressure gauges, and 21 and 22 denote connecting portions for detachably connecting the vaporizer box a and the sampling gas cylinder 10.

Next, the operation of the above embodiment will be described. At the time of sampling, first, the inlet 10 'of the sampling gas cylinder 10 is connected to the connection 21 of the vaporizer box a, and the outlet 10 "of the sampling gas cylinder 10 is connected to the connection 22 of the sample gas recovery line 11. Then, the hot water 4 is filled in the vaporization container 2.

Next, the valve 13 is closed, and the valves 12 ', 14, 15, 16, 17
And introduce a low-temperature liquefied gas into the heat transfer tube 3. At this time,
The LNG introduction pressure is adjusted by the valve 12 ′, and the pressure in the sampling gas cylinder 10 is adjusted by the valve 16. The introduced low-temperature liquefied gas is gasified by heat exchange with the hot water 4 in the vaporization vessel 2, and the gasified sample is supplied from the sample gas introduction line 8 into the sampling gas cylinder 10 and the sample gas recovery line.
It flows to the low-temperature liquefied gas recovery line 12 via 11. After a lapse of a predetermined time, the valve 16 is closed, and filling of the sampling gas cylinder 10 with gas is started. The amount of gas introduced into the sampling gas cylinder 10 is monitored by a pressure gauge 18, and when a predetermined amount (pressure) is reached, the valves 14, 15 are closed. At the time of the above-mentioned vaporization, in the vaporization vessel 2, since the hot water 4 is lowest in the coiled shape of the heat transfer tube 3, the stirring is performed at any time at the time of stirring 5 so as to make the hot water temperature uniform.

When performing the analysis, the sampling gas cylinder 10 is temporarily connected to the vaporizer box a and the low-temperature liquefied gas recovery line 12.
Disconnect from the side, connect the analyzer to the connection part 21 of the sampling gas cylinder 10, and open the valve 15 to carry out. When discharging the residual gas in the sampling gas cylinder 10, the valve 16 is opened and the valve 15 is closed.

[Effects of the Invention] The present invention has the above-described configuration and operation, and has the following effects.

a. Since LNG etc. is not directly collected in the vacuum sampling chamber, air is not mixed into the sample and does not adversely affect the analysis value.

Table 1 shows the analysis results in the case of the present invention and in the case of the conventional example, and it can be seen that the fluctuation of the analysis value is large in the case of the conventional example.

b. Since the low-temperature liquefied gas is not collected in the vacuum sample chamber, the collection amount does not change due to pressure fluctuation, and the collection does not require skill.

c. The gasified material is collected in a sampling gas cylinder, which can be directly analyzed. As a result, there is no need for a conventional procedure for gasifying a low-temperature liquefied gas during analysis.

d. Compared to the conventional example of directly collecting low-temperature liquefied gas, the sampling device does not need to adopt a pressure-resistant and heat-resistant structure, and can be reduced in weight. As a result, it is convenient for handling and transportation.

e. Production cost is low because it is not a vacuum specification.

f. In the vaporization vessel, a stirring rod is inserted at the center of the coil of the evaporating tube where the temperature is the lowest, and by stirring the hot water with this stirring rod, the temperature of the hot water is made uniform to evaporate. Efficiency can be increased.

g. The temperature of the hot water in the vaporization vessel can be controlled by a thermometer.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a sampling device according to the present invention, FIG.
FIG. 1 is an explanatory diagram of a conventional sampling device. DESCRIPTION OF SYMBOLS 1 ... Low temperature liquefied gas introduction line 2 ... Vaporization container 3 ... Heat transfer tube 4 ... Hot water 5 ... Stirrer bar 6 ... Temperature sensor 7 ... Thermometer 8 ... Sample gas introduction line 10 ... Sampling gas cylinder a ... vaporizer box

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazumi Yokota 3-4 Fukuodai, Sodegaura-cho, Kimitsu-gun, Chiba Prefecture (56) References JP-A-59-88141 (JP, A) , U) Tokiko 40-479 (JP, B1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A coiled heat transfer tube 3 is vertically inserted into a vaporization vessel 2 filled with hot water 4, an upper inlet 3 'of the heat transfer tube 3 is connected to a low temperature liquefied gas introduction line 1, and a lower outlet is provided. 3 ″ was started up in the vaporization vessel 2 and connected to the sample gas introduction line 8, a temperature sensor 6 for detecting the temperature in the hot water 4 in the vaporization vessel 2, and a temperature detected by the sensor 6. The stirrer rod 5 is inserted into the coiled center of the heat transfer tube 3 from above to a position at which the stirring rod 5 comes out from the lower portion of the heat transfer tube 3 to supply hot water to the coiled shape of the heat transfer tube 3. The sample gas cylinder connection 21 is formed at the end of the sample gas introduction line 8, and the sample gas is connected to the low temperature liquefied gas recovery line 12 following the low temperature liquefied gas introduction line 1. Collection A sampling gas cylinder connecting portion 22 is formed at the end of the line 11, an inlet 10 ′ of the sampling gas cylinder 10 is connected to the connecting portion 21, and an outlet 10 ″ is connected to the connecting portion 22. Gasification sampling device for liquefied gas.