JPH0450619A - Flow-rate measuring method for low-temperature liquefied gas and flowmeter using same - Google Patents
Flow-rate measuring method for low-temperature liquefied gas and flowmeter using sameInfo
- Publication number
- JPH0450619A JPH0450619A JP15169490A JP15169490A JPH0450619A JP H0450619 A JPH0450619 A JP H0450619A JP 15169490 A JP15169490 A JP 15169490A JP 15169490 A JP15169490 A JP 15169490A JP H0450619 A JPH0450619 A JP H0450619A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- low
- temperature liquefied
- liquefied gas
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 7
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 230000008016 vaporization Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 78
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000006200 vaporizer Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、ある場所へ送給される低温液化ガスの流量
を測定する方法及びその方法を用いた流量計に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for measuring the flow rate of low-temperature liquefied gas delivered to a certain location, and a flowmeter using the method.
（従来技術）
液体酸素、液体窒素、液体アルゴンのような低温液化ガ
スは、例えばその保有する寒冷を利用するためには液体
のまま使用場所へ送給しなければならない。しかしなが
らこれらの低温液化ガスはきわめて気化しやすく、流量
を測定すべき管路中においても気化ガスの気泡を同伴す
る場合が多く、また沸騰によって常に液面が泡立った状
態にあるので、その正確な流量を測定することは非常に
困難であった。(Prior Art) Low-temperature liquefied gases such as liquid oxygen, liquid nitrogen, and liquid argon must be delivered to the place of use in a liquid state, for example, in order to utilize the coldness they possess. However, these low-temperature liquefied gases are extremely easy to vaporize, and bubbles of vaporized gas are often entrained in the pipeline where the flow rate is to be measured, and the liquid level is always in a bubbling state due to boiling, so it is difficult to accurately measure the flow rate. It was very difficult to measure the flow rate.
そのため、例えば実願昭５２−８１１８８号（実開昭５
４−８４６８号）明細書には、低温液化ガスを熱交換器
において大気又は他の熱媒体で加温して気化し、気化さ
れたガスをガス流量計で正確な流量を測定した後に、熱
交換器において冷媒によって冷却再液化して使用場所へ
送給するという低温液化ガスの流量測定装置が開示され
ている。Therefore, for example, Utility Application No. 52-81188 (Utility Application No. 52-81188)
No. 4-8468) The specification states that low-temperature liquefied gas is heated in a heat exchanger with the atmosphere or other heat medium to vaporize it, and after measuring the accurate flow rate of the vaporized gas with a gas flow meter, A low-temperature liquefied gas flow rate measuring device is disclosed in which the low-temperature liquefied gas is cooled and re-liquefied using a refrigerant in an exchanger and then sent to a place of use.
しかしながら上記の先行技術は、同明細書にも記されて
いるように（第１頁末尾２行）少量の低温液化ガスの流
量には適しているかもしれないが、工業的用途に用いる
程度の流量の場合には不適当な装置である。何故ならば
、低温液化ガスが気化すると数百倍の体積のガスとなる
ので（例えば液体窒素はＯ’Ｃ，１気圧で６４８倍）、
全量を気化してガス流量を測定し、さらに再液化するに
は、装置を大型化しなくてはならず、費用もかかるとい
う欠点があった。However, as stated in the same specification (last two lines of the first page), the above-mentioned prior art may be suitable for the flow rate of a small amount of low-temperature liquefied gas, but it is not suitable for use in industrial applications. In the case of flow rate, it is an inappropriate device. This is because when low-temperature liquefied gas is vaporized, it becomes a gas several hundred times the volume (for example, liquid nitrogen is 648 times the volume at O'C, 1 atmosphere).
In order to vaporize the entire amount, measure the gas flow rate, and then reliquefy the gas, the device must be large and expensive.
（発明が解決しようとする課題）
この発明は、上記のような欠点を除去し、気泡の混入し
ない正確な低温液化ガスの流量を簡便に測定することの
できる測定方法及び測定装置（流量計）を提供すること
を目的としている。(Problems to be Solved by the Invention) The present invention provides a measuring method and a measuring device (flow meter) that eliminates the above-mentioned drawbacks and can easily measure the flow rate of low-temperature liquefied gas accurately and without the inclusion of bubbles. is intended to provide.
（課題を解決するための手段）
その目的は、一定圧力下にある低温液化ガスを取出して
所望の圧力まで膨張させて一部分を気化した後に気液分
離し、次いで分離された気化ガスの流量を測定すること
によって、気液分離後の送給低温液化ガスの流量を知る
ことかできるこの発明の方法により達成される。(Means for solving the problem) The purpose is to extract low-temperature liquefied gas under a constant pressure, expand it to a desired pressure, vaporize a portion, and then separate the gas and liquid, and then control the flow rate of the separated vaporized gas. This is achieved by the method of the present invention, which allows the flow rate of the low-temperature liquefied gas to be fed after gas-liquid separation to be known by measuring it.
また一方、この発明は、上記の方法を実施するために、
一定圧力下にある低温液化ガス供給源からの低温液化ガ
ス導出管に所望の圧力への膨張弁、気液分離器を順次設
け、前記気液分離器下部には低温液化ガス送給管を、上
部にはガス流量計を備えた気化ガス導出管を設けて、前
記低温液化ガス送給管を通る低温液化ガス流量を測定す
る流量計も提供するものである。On the other hand, in order to carry out the above method, the present invention provides the following steps:
A low-temperature liquefied gas outlet pipe from a low-temperature liquefied gas supply source under constant pressure is sequentially provided with an expansion valve to a desired pressure and a gas-liquid separator, and a low-temperature liquefied gas feed pipe is provided at the bottom of the gas-liquid separator. The present invention also provides a flow meter that is provided with a vaporized gas outlet pipe equipped with a gas flow meter on the upper part and measures the flow rate of the low temperature liquefied gas passing through the low temperature liquefied gas feed pipe.
ある低温液化ガスを膨張させた場合、何％の低温液化ガ
スが気化してガスとなるかは、低温液化ガスの種類ごと
に、膨張前の圧力と膨張後の圧力がわかれば容易に知る
ことかできる。例えば液体窒素の場合、５ｋｇ／ｃＪ（
ゲージ圧）から大気圧まで膨張すれば、その２０％が気
化して８０％が液体として残る。したがって正確な測定
が容易なガス（窒素ガス）の量を測定することにより、
液体として残る液体窒素の量を知ることができる。この
場合、膨張前の低温液化ガスが気液平衡状態にあれば、
−層正確な値が得られる。When a certain low-temperature liquefied gas is expanded, what percentage of the low-temperature liquefied gas vaporizes and becomes gas can be easily determined by knowing the pressure before expansion and the pressure after expansion for each type of low-temperature liquefied gas. I can do it. For example, in the case of liquid nitrogen, 5 kg/cJ (
When it expands from (gauge pressure) to atmospheric pressure, 20% of it vaporizes and 80% remains as liquid. Therefore, by measuring the amount of gas (nitrogen gas) that is easy to accurately measure,
You can find out how much liquid nitrogen remains as a liquid. In this case, if the low-temperature liquefied gas before expansion is in a vapor-liquid equilibrium state,
- Layer accurate values are obtained.
この発明は上に述べた原理に基いてなされたものであり
、低温液化ガスのガスの種類ごとに、Ｐ１圧力のものを
Ｐ２圧力にまで膨張すれば、膨張前の低温液化ガスのＧ
％が気化するかはすでに知られているのでＧ％に相当す
る気化ガスの流量を正確に測定することにより、（１０
０−Ｇ ）％に相当する液体として残った低温液化ガス
の流量を容易にしかも正確に知ることができるのである
。This invention was made based on the above-mentioned principle, and for each type of low-temperature liquefied gas, if a pressure of P1 is expanded to a pressure of P2, the G of the low-temperature liquefied gas before expansion is
Since it is already known whether G% is vaporized, by accurately measuring the flow rate of vaporized gas corresponding to G%, (10
The flow rate of the low-temperature liquefied gas remaining as a liquid corresponding to 0-G)% can be easily and accurately determined.
以下に、この発明による低温液化ガス流量計の一実施態
様を例として示す図を参照しながらこの発明をさらに詳
細に説明する。In the following, the invention will be explained in more detail with reference to figures showing by way of example one embodiment of a low temperature liquefied gas flowmeter according to the invention.
（実施例）
送給すべき低温液化ガスは、断熱二重容器、例えばコー
ルドエバポレータと呼ばれる供給貯槽１内に収容され、
その一部が加圧用気化器２、圧力調整器３を備えた供給
加圧ライン４を通って一定圧力の気化ガスとなって貯槽
ｌの気相部に戻される。この場合供給貯槽ｌ内の気相部
の圧力と平衡した液相温度となるように、加圧用気化器
２には通常よりは多くの低温液化ガスを流して一部を気
化し、残部は液体のまま加温して貯槽１内に戻す。(Example) The low-temperature liquefied gas to be supplied is stored in a heat-insulated double container, for example, a supply storage tank 1 called a cold evaporator,
A part of it passes through a supply pressurization line 4 equipped with a pressurization vaporizer 2 and a pressure regulator 3, becomes vaporized gas at a constant pressure, and is returned to the gas phase portion of the storage tank 1. In this case, a larger amount of low-temperature liquefied gas than usual is flowed into the pressurizing vaporizer 2 to vaporize a part of it, and the rest is a liquid so that the liquid phase temperature is in equilibrium with the pressure of the gas phase in the supply storage tank l. Warm it as it is and return it to storage tank 1.
これにより貯槽１内の低温液化ガスは圧力Ｐ１の気液平
衡状態となり、液取出し管５を経て貯槽１外に取出され
、断熱された低温液化ガス導出管（断熱層は図示されて
いない）６に送出される。次いで低温液化ガスは、前記
導出管６に設けられた膨張弁７によって所望圧力（例え
ば使用圧力） Ｐ２まで膨張され、導出管６から気液分
離器８内へ気液混合状態で導入される。気液分離器８に
は、下部に低温液化ガス送給管９が、上部には気化ガス
導出管ｌＯが設けられ、気化ガス導出管ｌＯには、公知
の種類のガス流量計１１が取付けられている。１２は、
低温液化ガス送給管１１に設けられた開閉弁である。As a result, the low-temperature liquefied gas in the storage tank 1 enters a gas-liquid equilibrium state with a pressure P1, and is taken out of the storage tank 1 via the liquid take-out pipe 5, and is insulated into a low-temperature liquefied gas outlet pipe (the heat insulating layer is not shown) 6. will be sent to. Next, the low-temperature liquefied gas is expanded to a desired pressure (for example, working pressure) P2 by an expansion valve 7 provided in the outlet pipe 6, and is introduced from the outlet pipe 6 into the gas-liquid separator 8 in a gas-liquid mixed state. The gas-liquid separator 8 is provided with a low-temperature liquefied gas feed pipe 9 at the lower part and a vaporized gas outlet pipe 10 at the upper part, and a known type of gas flow meter 11 is attached to the vaporized gas outlet pipe 10. ing. 12 is
This is an on-off valve provided in the low-temperature liquefied gas feed pipe 11.
前記したように膨張弁７で膨張されて気化し、気液分離
器８で分離されて気化ガス導出管１０から導出される気
化ガスと、液体のまま残り低温液化ガス゛送給管９を通
って送給される低温液化ガスとの比率は、低温液化ガス
のガスの種類と、貯槽ｌ内の圧力Ｐ、及び気液分離器８
内の圧力Ｐ２とによって定まるので、気化ガス流量計１
１によって測定された数値から、低温液化ガス送給管９
を通る流量は計算によって求めることができる。その計
算は、例えば必要な情報を記憶させておけば、コンピュ
ータによって容易に行うことができるので、きわめて容
易である。As described above, the vaporized gas is expanded and vaporized by the expansion valve 7, separated by the gas-liquid separator 8, and led out from the vaporized gas outlet pipe 10, and the low-temperature liquefied gas that remains as a liquid is passed through the feed pipe 9. The ratio of the low-temperature liquefied gas to be fed depends on the type of low-temperature liquefied gas, the pressure P in the storage tank 1, and the gas-liquid separator 8.
The vaporized gas flow meter 1
From the values measured by 1, the low temperature liquefied gas feed pipe 9
The flow rate through can be determined by calculation. The calculation is extremely easy because it can be easily performed by a computer, for example, if the necessary information is stored.
気液分離器８は、低温液化ガス送給管９を通る低温液化
ガス流量に見合った大きさのもので、分離器８下部に液
体ができるだけ溜らずに、管７から送入された低温液化
ガスがそのまま管１２から流出するようにするのが好ま
しい。例えば管１２からの流出量がＩＯＡ／ｍｉｎの場
合、気液分離器８の内容積は５１程度である。また気液
分離をできるだけ完全に行うために、例えば気液分離器
８内に金網やスパイラルワイヤ片などを充填することも
できる。The gas-liquid separator 8 is of a size commensurate with the flow rate of the low-temperature liquefied gas passing through the low-temperature liquefied gas feed pipe 9, and is designed to prevent liquid from accumulating at the bottom of the separator 8 as much as possible. Preferably, the gas is allowed to flow directly out of the tube 12. For example, when the flow rate from the pipe 12 is IOA/min, the internal volume of the gas-liquid separator 8 is about 51. Further, in order to perform gas-liquid separation as completely as possible, the gas-liquid separator 8 may be filled with wire mesh, pieces of spiral wire, etc., for example.
気化ガス導出管１０で導出された気化ガスは、まだ非常
な低温であるが、一般に用いられるガス流量計は低温ガ
スの測定には不適なので、図示しない熱交換器で、空気
、その他により常温付近まで加温された後にガス流量計
１１に導入される。この場合、ガスを常に一定温度で導
入するか、ガス流量計１１の表示が温度補正されるよう
にして、所定温度における正確な流量が得られるように
するのが好ましい。The vaporized gas led out by the vaporized gas outlet pipe 10 is still at a very low temperature, but since commonly used gas flowmeters are not suitable for measuring low-temperature gas, a heat exchanger (not shown) is used to cool the vaporized gas to around room temperature using air or other materials. After the gas is heated to a temperature of 100°C, it is introduced into the gas flow meter 11. In this case, it is preferable to always introduce the gas at a constant temperature or to temperature-compensate the display of the gas flow meter 11 so that an accurate flow rate at a predetermined temperature can be obtained.
（効 果）
この発明は、上に述べたような構成を有するものであり
、そこから次のような効果を生じる。(Effects) This invention has the configuration described above, and the following effects are produced therefrom.
（１）気泡が混入したり、常に沸騰状態にあって正確な
測定が困難な低温液化ガスの流量を、測定が簡単で容易
なガス流量測定値から正しく計算することができる。(1) The flow rate of low-temperature liquefied gas, which is difficult to accurately measure because it contains bubbles or is always in a boiling state, can be accurately calculated from the gas flow rate measurement value, which is simple and easy to measure.
（２）装置の構成も簡単であり、信頼性が高い。(2) The configuration of the device is simple and highly reliable.
（３）膨張後の低温液化ガス（気化しなかった残部の液
体）は、温度が降下して安定した気液平衡状態となるの
で、これを冷媒として使用する場合には一層有利である
。(3) Since the temperature of the expanded low-temperature liquefied gas (remaining liquid that has not been vaporized) falls and a stable vapor-liquid equilibrium state is reached, it is more advantageous when used as a refrigerant.
図は、この発明による低温液化ガス流量計の一実施態様
を示す図である。
■・・・低温液化ガス供給貯槽、４・・・１の供給加圧
ライン、６・・・低温液化ガス導出管、７・・・膨張弁
、８・・・気液分離器、９・・・低温液化ガス送給管、
１０・・・気化ガス導出管、１１・・・ガス流量計。The figure is a diagram showing one embodiment of a low-temperature liquefied gas flowmeter according to the present invention. ■...Low-temperature liquefied gas supply storage tank, 4...1 supply pressurization line, 6...Low-temperature liquefied gas outlet pipe, 7...Expansion valve, 8...Gas-liquid separator, 9...・Low temperature liquefied gas supply pipe,
10... Vaporized gas outlet pipe, 11... Gas flow meter.
Claims (1)
流量を測定する方法において、前記低温液化ガスを所望
の圧力まで膨張させて一部分を気化した後に気液分離し
、次いで分離された気化ガスの流量を測定することによ
って、前記場所へ送給される気液分離後の低温液化ガス
流量を知る低温液化ガスの流量測定方法。 ２、一定圧力下にある低温液化ガス供給源からの低温液
化ガス導出管に所望の圧力への膨張弁、気液分離器を順
次設け、前記気液分離器下部には低温液化ガス送給管を
、上部にはガス流量計を備えた気化ガス導出管を設けて
ある前記低温液化ガス送給管を通る低温液化ガス流量を
測定する流量計。[Claims] 1. In a method for measuring the flow rate of low-temperature liquefied gas supplied to a location under a constant pressure, the low-temperature liquefied gas is expanded to a desired pressure and partially vaporized, and then gas-liquid separation is performed. and then measuring the flow rate of the separated vaporized gas to determine the flow rate of the low temperature liquefied gas after gas-liquid separation to be sent to the location. 2. A low-temperature liquefied gas outlet pipe from a low-temperature liquefied gas supply source under constant pressure is sequentially provided with an expansion valve to a desired pressure and a gas-liquid separator, and a low-temperature liquefied gas feed pipe is installed at the bottom of the gas-liquid separator. and a flow meter for measuring the flow rate of low-temperature liquefied gas passing through the low-temperature liquefied gas feed pipe, the upper part of which is provided with a vaporized gas outlet pipe equipped with a gas flow meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15169490A JP2758977B2 (en) | 1990-06-12 | 1990-06-12 | Low temperature liquefied gas flow measurement method and flow meter using the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15169490A JP2758977B2 (en) | 1990-06-12 | 1990-06-12 | Low temperature liquefied gas flow measurement method and flow meter using the method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0450619A true JPH0450619A (en) | 1992-02-19 |
| JP2758977B2 JP2758977B2 (en) | 1998-05-28 |
Family
ID=15524226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15169490A Expired - Lifetime JP2758977B2 (en) | 1990-06-12 | 1990-06-12 | Low temperature liquefied gas flow measurement method and flow meter using the method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2758977B2 (en) |
-
1990
- 1990-06-12 JP JP15169490A patent/JP2758977B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2758977B2 (en) | 1998-05-28 |
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