JPH032627A - Liquid-level detecting method - Google Patents
Liquid-level detecting methodInfo
- Publication number
- JPH032627A JPH032627A JP13604789A JP13604789A JPH032627A JP H032627 A JPH032627 A JP H032627A JP 13604789 A JP13604789 A JP 13604789A JP 13604789 A JP13604789 A JP 13604789A JP H032627 A JPH032627 A JP H032627A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- liquid
- liquid level
- reactor
- main body
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 6
- 238000001514 detection method Methods 0.000 claims description 10
- 239000007791 liquid phase Substances 0.000 claims description 8
- 239000012071 phase Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は液面レベルの検出方法１こ係り、特−こポリエ
ステル樹脂等の高粘度液を、高＋１！（約３００℃）、
高真空（数Ｔｏｒｒ）下で反応操作させるために用いら
れる半ｊｌ張込み形の反応器憂こ好適な内容液のレベル
をチエツクする方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for detecting liquid level (1), which is particularly useful for detecting high viscosity liquids such as polyester resin. (approximately 300℃),
The present invention relates to a method for checking the level of a suitable liquid in a half-filled reactor used for operating reactions under high vacuum (several Torr).
従来の液面レベルの検出方法は、コマーシャルプラント
に使われる大容量の反応器においては、ｒ線しベル計で
液面レベルを測定していた。（高温、高真空下でしかも
高粘度液を対象とするため安価で簡単な計器がないのが
環状である。）実験設備の小容量（数百リットル以下）
の攪拌機においては上記レベル計を取付けるには構造的
に難しく、また液相部の高さが絶対的に少ないので精度
的にも問題があるので、現在はレベル針を設けないで運
転している。従来より使われている実験設備規模の反応
器内の内容液レベルを確認する方法を第４図、第５図に
示す。図において、反応器本体１へは入口ノズル２より
連続的にポリマーが供給され、反応器本体１では半量張
込み状態が維持され、出口ノズル３からポリマーが排出
される。The conventional method for detecting the liquid level in large-capacity reactors used in commercial plants was to measure the liquid level using an R-ray bell meter. (Annular equipment is used at high temperatures, under high vacuum, and with high viscosity liquids, so there are no inexpensive and simple instruments available.) The experimental equipment has a small capacity (a few hundred liters or less).
It is structurally difficult to install the above-mentioned level meter in the stirrer, and there is also a problem with accuracy since the height of the liquid phase is absolutely small, so currently it is operated without a level needle. . Figures 4 and 5 show a conventional method for checking the liquid content level in a reactor on the scale of an experimental facility. In the figure, polymer is continuously supplied to the reactor main body 1 from an inlet nozzle 2, the reactor main body 1 is maintained in a half-filled state, and the polymer is discharged from an outlet nozzle 3.
反応副生物はペーパー出ロノズル４より蒸気の状態とな
って出ていく。反応器本体１内の内容液（ポリマー）を
一定の滞留時間となるよう、内容液のレベルを確認する
必要がある。反応器本体ｌに鉄鋼製のレベル指示棒１０
が取り付けられており、覗窓５と照明窓６を使ってレベ
ルを確認している。The reaction by-products exit from the paper exit nozzle 4 in the form of steam. It is necessary to check the level of the content liquid (polymer) in the reactor body 1 so that the content liquid (polymer) remains in the reactor body 1 for a certain period of time. A steel level indicator rod 10 is attached to the reactor body l.
is installed, and the level is checked using a viewing window 5 and a lighting window 6.
しかし、覗窓ガラスを加熱することはできないために、
ガラスが冷えた状態となり運転開始後すく。However, since the viewing window glass cannot be heated,
The glass will be cold and will start to cool down after starting operation.
に内容液の昇華物がガラス内面に付着し、液面レベルが
確認できな鳴なる。そこで最初に液面レベルを確認した
り、反応容器容量が既知であるため供給する時間を計測
して適切なレベルまで張り込み、その後抜出しを開始し
出入口ポリマーの流蓋を検定するだけで連続運転状態を
保持している。The sublimate of the liquid will adhere to the inner surface of the glass, making it impossible to check the liquid level. Therefore, first check the liquid level, measure the supply time since the reaction vessel capacity is known, fill it up to the appropriate level, then start extraction, and check the polymer flow cap at the inlet and outlet to ensure continuous operation. is held.
従って、出入口蓋に変１ヒが起こると、反応器内のレベ
ルが変わり、その時のレベル測定もできないため、滞留
時間も変ってしまう。滞留時間が変動すると、ポリマー
の品質も変わり連続的に所定の品質を得ることができな
くなる。実験設備においては反応器本体ｌを開放して液
面レベルの再確認後、テスト継続ということも可能であ
るが、実験設備規模のコマーシャルプラントではそれで
は済まされない。なお、この種の装置として関連するも
のには例えば実公昭５５−３３８６号が挙げられる。Therefore, if a failure occurs in the inlet/outlet cover, the level inside the reactor changes, and since the level cannot be measured at that time, the residence time also changes. When the residence time varies, the quality of the polymer also changes, making it impossible to continuously obtain a predetermined quality. In experimental facilities, it is possible to continue the test after opening the reactor body 1 and reconfirming the liquid level, but this is not sufficient in commercial plants on the scale of experimental facilities. Incidentally, related devices of this type include, for example, Utility Model Publication No. 55-3386.
上記従来技術は、液面レベルの検出方法に適切な装ｆｉ
ｔ （ｒ線しベル計、静電容量式レベル計など）がない
ため、反応器内のレベルを検出することができない。従
って、滞留時間が一定であることを確認することができ
ず、ポリマーの品質にも影響が出るという欠点があった
。The above-mentioned conventional technology requires appropriate equipment for the liquid level detection method.
Since there is no R-ray bell meter, capacitive level meter, etc., the level inside the reactor cannot be detected. Therefore, it was not possible to confirm that the residence time was constant, and the quality of the polymer was also affected.
本発明の目的は、滞留時間を一定にし、連続的に品質の
安定した製品が得られる液面レベル検出方法を提供する
ことにある。An object of the present invention is to provide a liquid level detection method that makes the residence time constant and continuously produces products of stable quality.
上記目的を達成するために、反応器本体内に高さ方向に
ある間隔で温度検出端を設け、高さ方向の温度分布を計
測して液面レベルを検出する方法を採用したものである
。In order to achieve the above object, a method is adopted in which temperature detection ends are provided at certain intervals in the height direction within the reactor main body, and the temperature distribution in the height direction is measured to detect the liquid level.
反応器本体はジャケット構造になっており、加熱媒体が
供給され、真空（約数Ｔｏｒｒ）下で、内容物が約３０
０℃の温度条件下で運転されている。The reactor body has a jacket structure, a heating medium is supplied, and the contents are heated to about 30 mA under vacuum (about several Torr).
It is operated at a temperature of 0°C.
液相部分は、ジャケットからの加熱と攪拌動力が熱暑こ
変って吸熱され、所定の温度にと制御されて運転されて
いる。また、気相部は反応器本体のシャケブト部だけで
加熱されることになる。気相部は高真空下で液相から反
応により少魔の低分子址の副生物が系外に排出されてい
る。従って熱伝達が悪く、また輻射伝熱も小さいため、
気相部は液相部温度より若干低い温度レベルとなる。こ
の気相部と液相部の温度レベル差を利用して液面の位置
を検出する方法である。The liquid phase portion is operated at a predetermined temperature by absorbing heat from the heating and stirring power from the jacket. Further, the gas phase portion is heated only by the bottom portion of the reactor main body. The gas phase is under high vacuum, and the by-products of the low-molecular-weight particles are discharged from the system through a reaction from the liquid phase. Therefore, heat transfer is poor and radiation heat transfer is also small.
The temperature of the gas phase is slightly lower than the temperature of the liquid phase. This is a method of detecting the position of the liquid level using the difference in temperature level between the gas phase and the liquid phase.
以下本発明の実施例を第１図ないし第３図により説明す
る。図において、反応器本体１に温度検出器７を設（す
、反応器本体側と大気側とを遮断するため保護管８を反
応器本体内に挿入する。保護管８内には液レベルの高さ
方向に複数個ある所定の間隔て熱電対９の検出端１１を
取り付ける。以上の構成において、保護管内の所定高さ
の温度が熱電対の検出端で検出でき、高さ方向の温度分
布が計測できる。その結果液中にみろ温度指示値と気相
にある温と指示値との変化点が計測され、液面レベルが
検出できる。Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, a temperature detector 7 is installed in the reactor main body 1 (a protection tube 8 is inserted into the reactor main body to isolate the reactor main body side from the atmosphere side). A plurality of detection ends 11 of thermocouples 9 are attached at predetermined intervals in the height direction.In the above configuration, the temperature at a predetermined height inside the protection tube can be detected by the detection ends of the thermocouples, and the temperature distribution in the height direction As a result, the point of change between the temperature indicated value in the liquid and the temperature in the gas phase and the indicated value is measured, and the liquid level can be detected.
本実施例によれば、容量の小さな反応器において、簡単
でしかもスペースの小さな計測器で液面レベヲの位置を
連続して測定することができる。According to this embodiment, in a reactor with a small capacity, the position of the liquid level can be continuously measured using a simple measuring device that takes up a small space.
本発明によれば、保護管内に設けた複数個の熱電対によ
り、液相温度と気相温度との変化点を計測して液面レベ
ルを検出できるので、滞留時間を一定に運転することが
でき、連続して品質の安定した製品を得ることができる
。According to the present invention, the liquid level can be detected by measuring the point of change between the liquid phase temperature and the gas phase temperature using a plurality of thermocouples installed in the protection tube, so it is possible to operate with a constant residence time. It is possible to continuously obtain products with stable quality.
第１図は本発明の一実施例の反応器の縦断面図、第２図
は第１図のＡ−Ａ線断面図、第３図は温度計検出端の説
明図、第４図は従来の反応器の縦断面図、第５図は第４
図のＢ−Ｂ線断面図である。
１・・・・・・反応器本体、７・・・・・・温度検出器
、８・・曲保護管、９・・・・・・熱電対
オ
！
図
１２図
拍
第３図
第
酊
′；Ｉ５目Fig. 1 is a longitudinal sectional view of a reactor according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an explanatory diagram of the thermometer detection end, and Fig. 4 is a conventional one. Fig. 5 is a vertical cross-sectional view of the reactor in Fig. 4.
It is a sectional view taken along the line BB in the figure. 1... Reactor body, 7... Temperature detector, 8... Bent protection tube, 9... Thermocouple! Fig. 12 Beat 3 Fig. 1'; I5
Claims (1)
み形の連続攪拌用反応器の液面レベル検出方法において
、反応器内で液相部と気相部との温度変化点を計測し、
液面レベルを検出することを特徴とする液面レベル検出
方法。 ２、保護管を反応器本体に挿入し、保護管内に液相レベ
ル高さ方向に所定間隔で複数個の検出端を有する温度検
出手段により、温度変化点を計測し、液面の位置を確認
することを特徴とする請求項第１項記載の液面レベル検
出方法。[Claims] 1. In a method for detecting a liquid level in a half-filled continuous stirring reactor in which a high viscosity liquid is processed under high temperature and high vacuum conditions, a liquid phase portion and a gas phase portion are detected in the reactor. Measure the temperature change point with
A liquid level detection method characterized by detecting a liquid level. 2. Insert the protection tube into the reactor body, measure the temperature change point and confirm the position of the liquid level using the temperature detection means that has multiple detection ends at predetermined intervals in the liquid phase level height direction inside the protection tube. The liquid level detection method according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13604789A JPH032627A (en) | 1989-05-31 | 1989-05-31 | Liquid-level detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13604789A JPH032627A (en) | 1989-05-31 | 1989-05-31 | Liquid-level detecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH032627A true JPH032627A (en) | 1991-01-09 |
Family
ID=15165937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13604789A Pending JPH032627A (en) | 1989-05-31 | 1989-05-31 | Liquid-level detecting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH032627A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI582792B (en) * | 2012-09-11 | 2017-05-11 | 奇異日立核能美國有限公司 | Method and system for measuring a spent fuel pool temperature and liquid level without external electrical power |
| GB2546299A (en) * | 2016-01-14 | 2017-07-19 | Intelligent Energy Ltd | Fuel cartridge fill level sensing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6321825B2 (en) * | 1980-09-18 | 1988-05-09 | Yamaha Motor Co Ltd |
-
1989
- 1989-05-31 JP JP13604789A patent/JPH032627A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6321825B2 (en) * | 1980-09-18 | 1988-05-09 | Yamaha Motor Co Ltd |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI582792B (en) * | 2012-09-11 | 2017-05-11 | 奇異日立核能美國有限公司 | Method and system for measuring a spent fuel pool temperature and liquid level without external electrical power |
| GB2546299A (en) * | 2016-01-14 | 2017-07-19 | Intelligent Energy Ltd | Fuel cartridge fill level sensing |
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