JPH0634421A - Level gauge for evaporating and concentrating device - Google Patents
Level gauge for evaporating and concentrating deviceInfo
- Publication number
- JPH0634421A JPH0634421A JP3531892A JP3531892A JPH0634421A JP H0634421 A JPH0634421 A JP H0634421A JP 3531892 A JP3531892 A JP 3531892A JP 3531892 A JP3531892 A JP 3531892A JP H0634421 A JPH0634421 A JP H0634421A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- liquid
- tube
- purge
- liquid level
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蒸発濃縮装置に使用す
る液パージ式液位計の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a liquid purge type level gauge used in an evaporative concentration apparatus.
【０００２】[0002]
【従来の技術】蒸発濃縮装置において、装置を構成する
容器内の液面の位置を測定するためにさまざまな液位測
定手段が採用されているが、それぞれ欠点がある。2. Description of the Related Art In an evaporative concentrator, various liquid level measuring means are used to measure the position of the liquid level in a container constituting the device, but each has its drawbacks.
【０００３】最も簡単な手段は、隔膜シ−ル式の圧力測
定用素子を容器の横に取付けることであるが、隔膜シー
ル付キャピラリ式液位計は、容器内の温度が高くなった
り減圧されたりすると、キャピラリ内の封入液の連続性
が失なわれて液位を測定できなくなる可能性があり、ま
た、導圧管が閉塞しやすい。The simplest means is to install a diaphragm seal type pressure measuring element on the side of the container. In the capillary level gauge with a diaphragm seal, the temperature inside the container becomes high or the pressure is reduced. If this happens, the continuity of the enclosed liquid in the capillary may be lost, and the liquid level may not be measured, and the pressure guiding tube is likely to be blocked.
【０００４】非接触式の液位測定手段として、超音波を
利用する液面計が知られているが、この液面計は、液面
に泡があると原理的に液位測定ができない。 また超音
波が通過する部分の蒸気量や温度が変化すると、正確な
測定ができなくなる。As a non-contact type liquid level measuring means, a liquid level meter utilizing ultrasonic waves is known, but this liquid level meter cannot measure the liquid level in principle if bubbles are present on the liquid level. Further, if the amount of steam or the temperature of the portion where the ultrasonic waves pass changes, accurate measurement cannot be performed.
【０００５】別の手法は、容器の上部すなわちガス部と
底部にそれぞれ導圧管を設け、両者の圧力差を測定して
溶液の密度との関係から液位を算出する方法である。
この方法に使用する液位計は、容器底部に接続した下部
導圧管に濃縮された液が侵入して、液位指示を狂わせた
り導圧管を閉塞したりする。それを防止するため、空気
または液体（多くの場合は水または温水）を注入して導
圧管内の濃縮液をパージすることが必要である。 パー
ジに空気を使用するエアパージ式液位計は、導圧管内に
配置したバブラー管のエア吹出し口が閉塞しやすいとい
う問題があるため、蒸留濃縮装置や飽和に近い溶液を扱
う容器の液位測定には、水パージ式液位計が使用される
ことが多い。Another method is to provide a pressure guiding tube at the upper part of the container, that is, at the gas part and the bottom part, measure the pressure difference between the two, and calculate the liquid level from the relationship with the density of the solution.
In the liquid level meter used in this method, the concentrated liquid penetrates into the lower pressure guiding pipe connected to the bottom of the container, thereby disturbing the liquid level indication and closing the pressure guiding pipe. To prevent this, it is necessary to inject air or liquid (often water or hot water) to purge the concentrate in the pressure guiding tube. The air-purge type level gauge that uses air for purging has a problem that the air outlet of the bubbler tube placed inside the pressure guiding tube tends to be blocked, so the level measurement of the distillation concentrator or a container that handles a solution close to saturation is performed. For this purpose, a water purge type level gauge is often used.
【０００６】水パージ式液位計にも、つぎのような問題
がある。 すなわち、パージ水の量が少ないと、図５に
示すように、容器（１）内部の濃厚で密度の高い溶液
（Ｓｏｌ）が、下部導圧管（２）内で相対的に密度の低
いパージ水（Ｐｇｗ）の下方を流れて対向する二相流を
形成し、下部導圧管に侵入する。 その結果、差圧測定
器に作用する液体の密度が変動し、液位指示をドリフト
させる。 パージ水の量を多くすればこれを防げるが、
多量のパージ水が容器の内部に入り溶液を薄めてしまう
から、濃縮装置の負荷が増大する。The water purge type level gauge also has the following problems. That is, when the amount of purge water is small, as shown in FIG. 5, the concentrated and high-density solution (Sol) inside the container (1) has a relatively low density in the lower pressure guiding pipe (2). It flows under (Pgw) to form an opposing two-phase flow and enters the lower pressure guiding tube. As a result, the density of the liquid acting on the differential pressure measuring device fluctuates, causing the liquid level indication to drift. This can be prevented by increasing the amount of purge water,
Since a large amount of purged water enters the container and dilutes the solution, the load on the concentrator increases.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、蒸発
濃縮装置の液位計として最適の液パージ式液位計におけ
る上記の問題を解決し、少量のパージ液の使用で導圧管
内への濃縮液の侵入を防ぐことのできる液パージ式の液
位計を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems in a liquid purging type liquid level meter which is optimal as a liquid level meter for an evaporative concentration apparatus, and to use a small amount of purging liquid into a pressure guiding tube. Another object of the present invention is to provide a liquid purging type liquid level gauge capable of preventing the invasion of the concentrated liquid.
【０００８】[0008]
【課題を解決するための手段】本発明の液位計は、蒸発
濃縮装置内の液面の位置を測定する装置であって、図１
に示すように、容器（１）の底部から上り勾配をもって
横に延びる下部導圧管（２）、容器（１）の上部に接続
された上部導圧管（７）、下部導圧管の先端から立上る
トラップ管（３）、トラップ管の延長上にあってその上
端が上部導圧管（７）に接続したベント管（５）、トラ
ップ管（３）とベント管（５）との接続部から分岐して
下り勾配をもって横に延びる、パージ液導入手段（図示
してない）を備えたパージ管（４）、および下部導圧管
内の圧力と上部導圧管内の圧力との差を測定するため、
一端をパージ管の端に接続し他端を上部導圧管の端に接
続した差圧測定器（６）からなる。The liquid level gauge of the present invention is a device for measuring the position of the liquid surface in an evaporative concentration device, and
As shown in, a lower pressure guiding pipe (2) extending laterally from the bottom of the container (1) with an upward slope, an upper pressure guiding pipe (7) connected to the upper part of the container (1), and rising from the tip of the lower pressure guiding pipe. The trap pipe (3), which is an extension of the trap pipe and whose upper end is connected to the upper pressure guiding pipe (7), is branched from the vent pipe (5) and the connecting portion between the trap pipe (3) and the vent pipe (5). A purge pipe (4) provided with a purge liquid introducing means (not shown) extending laterally with a downward slope, and for measuring the difference between the pressure in the lower pressure guiding pipe and the pressure in the upper pressure guiding pipe,
It comprises a differential pressure measuring device (6) having one end connected to the end of the purge pipe and the other end connected to the end of the upper pressure guiding pipe.
【０００９】トラップ管の長さは、容器内の液面の変動
および濃度拡散を考慮して、容器内の溶液がパージ管に
侵入しないように決定する。 たとえば、濃縮操業時の
液面ハンティングが７cmの装置に対しては、その２倍強
の１５cm程度のトラップ管長さが適当である。The length of the trap tube is determined in consideration of the fluctuation of the liquid level in the container and the concentration diffusion so that the solution in the container does not enter the purge pipe. For example, for a device having a liquid level hunting of 7 cm during the concentration operation, a trap tube length of about 15 cm, which is twice as much as that, is suitable.
【００１０】パージ液は、容器内部で濃縮される液の媒
体の種類に応じてえらべばよいが、水溶液の濃縮の場合
は水または温水で足りることはもちろんである。 パー
ジ液の供給速度は、理想的には濃度差による拡散の速度
を上回る量で足りるはずであるから、この条件をみたす
ように供給すればよいが、実際は多少の安全をみる方が
よい。 それでもパージ液は少量で済む。The purging liquid may be selected according to the type of medium of the liquid to be concentrated inside the container, but it is needless to say that water or warm water is sufficient for concentrating the aqueous solution. Since the supply rate of the purge liquid should ideally be sufficient to exceed the diffusion rate due to the difference in concentration, it may be supplied so as to satisfy this condition, but it is actually better to consider some safety. Still, a small amount of purge solution is enough.
【００１１】上部導圧管は気体で、下部導圧管は液体で
それぞれ満たされているから、両者の差圧は、ダイアフ
ラムシール付の差圧測定器を使用して測定することが好
ましい。Since the upper pressure guiding tube is filled with gas and the lower pressure guiding tube is filled with liquid, the differential pressure between the two is preferably measured using a differential pressure measuring instrument with a diaphragm seal.
【００１２】差圧測定器は、圧力媒体が同じであること
を前提にして差圧を測定するタイプのものが多い。 こ
のタイプの差圧測定器を使用するには、図２に示すよう
に、上部導圧管（７）の端に凝縮器（８Ａ）を設けてそ
の下方に液柱（９）を形成し、その液柱を介して上部導
圧管（７）内の圧力を差圧測定器（６）に伝えるように
すればよい。Many differential pressure measuring devices measure the differential pressure on the assumption that the pressure medium is the same. To use this type of differential pressure measuring device, as shown in FIG. 2, a condenser (8A) is provided at the end of the upper pressure guiding tube (7) and a liquid column (9) is formed below the condenser (8A). The pressure in the upper pressure guiding tube (7) may be transmitted to the differential pressure measuring device (6) via the liquid column.
【００１３】上記とあわせて、またはそれと別に、図３
に示したように、ベント管（５）の上部に凝縮手段（８
Ｂ）、たとえばベント管を取り巻く冷却用のジャケット
を設け、そこで形成された凝縮液をパージ液（Ｐｇｗ）
として使用すると、パージ管に供給する新鮮なパージ液
を実質上ゼロに、またはごく少量に減らすことができて
有利である。In addition to or separately from the above, FIG.
As shown in FIG.
B) For example, a cooling jacket surrounding the vent pipe is provided, and the condensate formed therein is purged (Pgw).
It is advantageous that the fresh purge liquid supplied to the purge pipe can be reduced to substantially zero, or to a very small amount.
【００１４】ベント管（５）の中途とパージ管（４）の
差圧測定器寄りの端にバルブを設けておくと、それらを
閉めることにより、下部導圧管を容易に洗浄できる。If a valve is provided in the middle of the vent pipe (5) and the end of the purge pipe (4) near the differential pressure measuring device, the lower pressure guiding pipe can be easily washed by closing them.
【００１５】[0015]
【作用】本発明の液位計は、上り勾配をもって横に延び
る下部導圧管とトラップ管との組み合わせを用いること
により、容器内部の濃厚液がパージ管に侵入するのを防
止した。 図４に示すように、溶液（Ｓｏｌ）は下部導
圧管（２）の一部に侵入するものの、上り勾配のためそ
の端までは達することができず、達したとしてもパージ
水（Ｐｇｗ）にくらべて密度が高いため、トラップ管
（３）にまで入ることはない。 このようにして、濃厚
液とパージ液との境界はほぼ一定に保たれるとともに、
差圧測定器に連なる配管すなわちパージ管の内部液の密
度が一定に保たれ、差圧の測定に狂いを生じないから、
信頼性の高い液位測定ができる。The liquid level gauge of the present invention prevents the concentrated liquid inside the container from invading the purge pipe by using a combination of a lower pressure guiding pipe and a trap pipe extending laterally with an ascending slope. As shown in FIG. 4, although the solution (Sol) entered a part of the lower pressure guiding tube (2), it could not reach the end due to the upward gradient, and even if it reached, it reached the purge water (Pgw). Since the density is higher than that of the trap tube (3), it does not enter the trap tube (3). In this way, the boundary between the concentrated liquid and the purge liquid is kept almost constant, and
Since the density of the internal liquid in the pipe connected to the differential pressure measuring device, that is, the purge pipe is kept constant, there is no error in measuring the differential pressure,
Highly reliable liquid level measurement is possible.
【００１６】本発明の液位計の測定原理を、図２を参照
して説明する。The measuring principle of the liquid level meter of the present invention will be described with reference to FIG.
【００１７】下部導圧管から液面までの高さすなわち容
器の液位をＨx、パージ管の高さすなわち差圧測定器か
らベント管までの高さをＨ1、差圧測定器から上部導圧
管に連なる凝縮器の液面までの高さをＨ2、溶液の密度
をρ1、パージ水の密度をρ０、トラップ管の長さをｈ
とすると、差圧測定器の下部導圧管側にかかる圧力Ｐ１
と、上部導圧管側にかかる圧力Ｐ2は次の式であらわさ
れる。The height from the lower pressure guiding pipe to the liquid surface, that is, the liquid level in the container is H x , the height of the purging pipe, that is, the height from the differential pressure measuring device to the vent pipe is H 1 , and the height from the differential pressure measuring device to the upper conducting pipe. The height of the condenser connected to the pressure tube to the liquid level is H 2 , the density of the solution is ρ 1 , the density of the purge water is ρ 0 , and the length of the trap tube is h.
Then, the pressure P 1 applied to the lower impulse pipe side of the differential pressure measuring instrument
Then, the pressure P 2 applied to the upper pressure guiding tube side is expressed by the following equation.
【００１８】 Ｐ1＝ρ1・Ｈx−ρ0・ｈ＋ρ0・Ｈ1 …………（１） Ｐ2＝ρ0・Ｈ2 …………（２） Ｐ1とＰ2との差△Ｐは、式（１）と式（２）から、 △Ｐ＝Ｐ1−Ｐ2＝（ρ1・Ｈx−ρ0・ｈ＋ρ0・Ｈ1）−ρ0・Ｈ2 となる。 容器の液位は、 Ｈx＝△Ｐ／ρ1＋（ｈ＋Ｈ2−Ｈ1）・ρ0／ρ1 となる。 ρ1が特定されれば(ｈ＋Ｈ2−Ｈ1)・ρ0／ρ
1は定数(Ｋ）となり、上式は次のように書き換えられ
る。P 1 = ρ 1 · H x −ρ 0 · h + ρ 0 · H 1 (1) P 2 = ρ 0 · H 2 ··· (2) Difference between P 1 and P 2 From the equations (1) and (2), ΔP is ΔP = P 1 −P 2 = (ρ 1 · H x −ρ 0 · h + ρ 0 · H 1 ) −ρ 0 · H 2 . The liquid level in the container is H x = ΔP / ρ 1 + (h + H 2 −H 1 ) · ρ 0 / ρ 1 . If ρ 1 is specified, (h + H 2 −H 1 ) · ρ 0 / ρ
1 becomes a constant (K), and the above equation can be rewritten as follows.
【００１９】Ｈx＝△Ｐ／ρ1＋Ｋ このようにして、差圧△Ｐを測定すれば、容器内の液位
を知ることができる。H x = ΔP / ρ 1 + K By thus measuring the differential pressure ΔP, the liquid level in the container can be known.
【００２０】[0020]
【発明の効果】本発明の液位計は、容器内の濃厚液が下
部導圧管内のほぼ一定のところに止まり、パージ液を供
給するパージ管にまで侵入することはないから、容器内
からパージ管を経て差圧測定器に至る経路内の液体の密
度の変動がなく、差圧が正確に測定でき、測定値の信頼
性が高い。 パージ液の供給は、液の濃度拡散速度を上
回る程度でよいから少量ですみ、濃縮装置の負荷に与え
る影響は実質上無視できるほど小さい。According to the liquid level meter of the present invention, since the concentrated liquid in the container stops at a substantially constant position in the lower pressure guiding pipe and does not penetrate into the purge pipe for supplying the purge liquid, There is no fluctuation in the density of the liquid in the path from the purge pipe to the differential pressure measuring device, the differential pressure can be measured accurately, and the measured value is highly reliable. Since the supply of the purge liquid may be higher than the concentration diffusion rate of the liquid, only a small amount is required, and the influence on the load of the concentrator is practically negligible.
【００２１】この液位計は種々の蒸発濃縮装置に使用可
能であるが、とくに放射性廃液を処理するための濃縮装
置のように、遠隔操作をすることが望ましい設備に適用
したとき、意義が大きい。This liquid level meter can be used in various evaporation concentrators, but it has great significance when applied to equipment where it is desirable to perform remote control, such as a concentrator for treating radioactive liquid waste. .
【図１】 本発明の液位計の構成を概念的に説明するた
めの断面図。FIG. 1 is a cross-sectional view for conceptually explaining the configuration of a liquid level meter of the present invention.
【図２】 本発明の液位計の変更態様を説明するため
の、図１と同様な図。FIG. 2 is a view similar to FIG. 1 for explaining a modification of the liquid level meter of the present invention.
【図３】 本発明の液位計の別の変更態様を説明するた
めの、図１と同様な図。FIG. 3 is a view similar to FIG. 1 for explaining another modification of the liquid level gauge of the present invention.
【図４】 本発明の作用を説明するための、トラップ管
の部分を拡大した断面図。FIG. 4 is an enlarged cross-sectional view of a portion of a trap tube for explaining the operation of the present invention.
【図５】 従来技術の問題点を説明するための、図４と
同様な拡大断面図。FIG. 5 is an enlarged cross-sectional view similar to FIG. 4 for explaining the problems of the conventional technique.
１ 容器 ２ 下部導圧管 ３ トラップ管 ４ パージ管 ５ ベント管 ６ 差圧測定器 ７ 上部導圧管 ８Ａ 凝縮器 ８Ｂ 凝縮手段 ９ 液柱 Ｓｏｌ 溶液 Ｐｇｗ パージ水 1 Container 2 Lower Pressure Pipe 3 Trap Pipe 4 Purge Pipe 5 Vent Pipe 6 Differential Pressure Measuring Device 7 Upper Pressure Pipe 8A Condenser 8B Condensing Means 9 Liquid Column Sol Solution Pgw Purge Water
Claims (5)
装置であって、蒸発濃縮装置を構成する容器の底部から
上り勾配をもって横に延びる下部導圧管、容器の上部に
接続された上部導圧管、下部導圧管の先端から立上るト
ラップ管、トラップ管の延長上にあってその上端が上部
導圧管に接続したベント管、トラップ管とベント管との
接続部から分岐して下り勾配をもって横に延びる、パー
ジ液導入手段を備えたパージ管、および下部導圧管内の
圧力と上部導圧管内の圧力との差を測定するため、一端
をパージ管の端に接続し他端を上部導圧管の端に接続し
た差圧測定器からなる液位計。1. A device for measuring the position of a liquid level in an evaporative concentration apparatus, the lower pressure guiding pipe extending laterally with an upward slope from the bottom of the container constituting the evaporative concentration device, and the upper part connected to the upper part of the container. Impulse pipe, a trap pipe rising from the tip of the lower impulse pipe, a vent pipe that is an extension of the trap pipe and has its upper end connected to the upper impulse pipe, and branches from the connection between the trap pipe and the vent pipe with a downward slope. In order to measure the difference between the pressure in the lower pressure guiding tube and the pressure in the upper pressure guiding tube, which extends laterally, and has a purge liquid introducing means, one end is connected to the end of the purge tube and the other end is connected to the upper guiding tube. A liquid level gauge consisting of a differential pressure measuring device connected to the end of a pressure tube.
圧測定器である請求項１の液位計。2. The liquid level gauge according to claim 1, wherein the differential pressure measuring device is a differential pressure measuring device with a diaphragm seal.
方に液柱を形成し、この液柱を介して上部導圧管内の圧
力を差圧測定器に伝える請求項１の液位計。3. The liquid level according to claim 1, wherein a condenser is provided at an end of the upper pressure guiding tube, a liquid column is formed below the condenser, and the pressure in the upper pressure guiding tube is transmitted to the differential pressure measuring device through the liquid column. Total.
で形成された凝縮液をパージ液として使用する請求項１
ないし３のいずれかの液位計。4. A condensing means is provided above the vent pipe, and the condensate formed there is used as a purge liquid.
The liquid level gauge of any one of 1 to 3.
て、トラップ管および下部導圧管を洗浄できるようにし
た請求項１ないし４のいずれかの液位計。5. The liquid level gauge according to claim 1, wherein the vent pipe and the purge pipe are provided with valves so that the trap pipe and the lower pressure guiding pipe can be washed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3531892A JPH087086B2 (en) | 1992-02-21 | 1992-02-21 | Evaporative concentrator level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3531892A JPH087086B2 (en) | 1992-02-21 | 1992-02-21 | Evaporative concentrator level gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0634421A true JPH0634421A (en) | 1994-02-08 |
| JPH087086B2 JPH087086B2 (en) | 1996-01-29 |
Family
ID=12438465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3531892A Expired - Lifetime JPH087086B2 (en) | 1992-02-21 | 1992-02-21 | Evaporative concentrator level gauge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH087086B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0715517A4 (en) * | 1993-06-15 | 2000-10-11 | Pherin Corp | Estrene steroids as neurochemical initiators of change in human hypothalamic function and related pharmaceutical compositions and methods |
| JP2012093109A (en) * | 2010-10-25 | 2012-05-17 | Chugoku Electric Power Co Inc:The | Piping structure and desulfurizer |
| CN103277670A (en) * | 2013-04-17 | 2013-09-04 | 新兴能源装备股份有限公司 | Low temperature liquefied gas pressure sampling apparatus |
| JP2013205107A (en) * | 2012-03-27 | 2013-10-07 | Mitsubishi Heavy Ind Ltd | Liquid level position measuring device and nuclear facility |
| CN106745423A (en) * | 2017-01-11 | 2017-05-31 | 启迪桑德环境资源股份有限公司 | A kind of level gauge system suitable for evaporator hot well |
-
1992
- 1992-02-21 JP JP3531892A patent/JPH087086B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0715517A4 (en) * | 1993-06-15 | 2000-10-11 | Pherin Corp | Estrene steroids as neurochemical initiators of change in human hypothalamic function and related pharmaceutical compositions and methods |
| JP2012093109A (en) * | 2010-10-25 | 2012-05-17 | Chugoku Electric Power Co Inc:The | Piping structure and desulfurizer |
| JP2013205107A (en) * | 2012-03-27 | 2013-10-07 | Mitsubishi Heavy Ind Ltd | Liquid level position measuring device and nuclear facility |
| CN103277670A (en) * | 2013-04-17 | 2013-09-04 | 新兴能源装备股份有限公司 | Low temperature liquefied gas pressure sampling apparatus |
| CN106745423A (en) * | 2017-01-11 | 2017-05-31 | 启迪桑德环境资源股份有限公司 | A kind of level gauge system suitable for evaporator hot well |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH087086B2 (en) | 1996-01-29 |
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| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960723 |