JPH06109511A - Flow rate measuring method for plug flow of earth and sand - Google Patents
Flow rate measuring method for plug flow of earth and sandInfo
- Publication number
- JPH06109511A JPH06109511A JP25640892A JP25640892A JPH06109511A JP H06109511 A JPH06109511 A JP H06109511A JP 25640892 A JP25640892 A JP 25640892A JP 25640892 A JP25640892 A JP 25640892A JP H06109511 A JPH06109511 A JP H06109511A
- Authority
- JP
- Japan
- Prior art keywords
- plug
- flow rate
- flow
- pressure
- sand
- 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
- Measuring Volume Flow (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、パイプラインなどの管
路を利用して土砂を混気圧送する際に、リアルタイムで
プラグ流の流量の計測を可能とする土砂プラグ流の流量
計測方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the flow rate of a plug flow of sediment, which enables real-time measurement of the flow rate of a plug flow when a mixture of atmospheric pressure is fed through a pipeline such as a pipeline. It is a thing.
【０００２】[0002]
【従来の技術】近年、パイプラインなどの管路を利用し
て気体や液体、さらには固体粒子を輸送する管路輸送の
一つの方法として、圧縮空気の膨張力を利用して、粘
土、シルト、細砂などの土砂を輸送する混気圧送の技術
が使用されている。この混気圧送は、渦巻ポンプなどに
より管路内に送り出した軟泥などの土砂に対して圧縮空
気を注入してプラグ流と呼ばれる流れを発生させるが、
この流れは、流動化した土砂が波のような形状となった
プラグと呼ばれる塊と、圧縮空気の層とが交互に繰り返
される流動状態となり、このプラグの大きさも段々と大
きくなる傾向にある。2. Description of the Related Art In recent years, as one method of pipeline transportation for transporting gas, liquid, and further solid particles by utilizing pipelines and the like, clay, silt and the like have been utilized by utilizing the expansive force of compressed air. , A mixed pressure technology for transporting fine sand and other sediment is used. In this mixed pressure feeding, compressed air is injected into earth and sand such as soft mud sent into the pipeline by a centrifugal pump or the like to generate a flow called a plug flow,
This flow is in a fluidized state in which lumps called plugs in which the fluidized sand has a wave-like shape and layers of compressed air are alternately repeated, and the size of the plugs tends to gradually increase.
【０００３】このように管路内を土砂が圧送される場
合、実際に圧送されている土砂の流量を把握することが
できれば、土砂圧送時の実際の土量の算定ができ、その
作業能率を知る上で有益である。一方、管路で輸送され
る水や固体粒子と液体の混合物のスラリー流量計測方法
としては、電磁流量計やドップラー流速計などが一般に
利用されているが、これらの計測方法は管内において液
体が連続的に流れていることが前提条件となっている。In the case where the sediment is pumped in the pipeline as described above, if the flow rate of the sediment that is actually pumped can be grasped, the actual amount of soil when the sediment is pumped can be calculated, and the work efficiency can be calculated. It is useful for knowing. On the other hand, electromagnetic flowmeters and Doppler anemometers are generally used as a method for measuring the slurry flow rate of water or a mixture of liquid and solid particles transported in a pipeline. It is a prerequisite that it is flowing.
【０００４】しかしながら、混気圧送によって発生する
プラグ流では、土砂のプラグと圧縮空気層とが交互に繰
り返され、流量を計測したい土砂は断続的な流れとなる
ために、上記の一般的な流量計測方法は適用できない。
また、従来プラグ流の流量を計測するためには、圧縮空
気を注入する手前のスラリー輸送状態の管路区間に上記
の一般的計測方法を適用したり、あるいは管路末端から
吐出される土砂の量を計量タンクにより直接計測してい
た。However, in the plug flow generated by mixed pressure feeding, the plug of sand and the compressed air layer are alternately repeated, and the sand whose flow rate is to be measured becomes an intermittent flow. The measurement method cannot be applied.
Further, in order to measure the flow rate of the conventional plug flow, the above general measurement method is applied to the pipeline section in the slurry transport state before injecting compressed air, or the amount of soil discharged from the pipeline end is measured. The quantity was measured directly by the measuring tank.
【０００５】しかしながら、混気圧送の実用機械におい
ては、前者は計測機器の求める十分なスラリー輸送の助
走区間を設けることが難しく、また後者は大容量の吐出
にはまったく対応できないなど、リアルタイムで計測す
る方法としては不十分なものであるという問題がある。However, in a practical machine for mixed pressure feeding, it is difficult for the former to provide a sufficient run-up section for slurry transportation required by a measuring instrument, and for the latter, it is impossible to cope with large-capacity discharge at all. There is a problem that it is an insufficient method.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、前記従来の
問題点を解決するためになされたものであり、従来の実
用機械の構造によらず、簡単な機械を取付けただけでプ
ラグ流の流量計測が可能なリアルタイム計測による土砂
プラグ流の計測方法を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and does not depend on the structure of the conventional practical machine, and the plug flow can be achieved by simply attaching a simple machine. It is an object of the present invention to provide a method for measuring sediment plug flow by real-time measurement capable of measuring flow rate.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の土砂プラグ流の計測方法は、土砂の混気圧
送の管路の吐出口付近に、所定の間隔Ｌをおいた２つの
定点に設けた各圧力計により計測される１つのプラグ単
体の管路内の圧力波形での時間差からプラグ単体の速度
Ｆｐを求め、このプラグ単体の速度Ｆｐと、上記２つの
定点のうちのいずれかをプラグ単体が通過する時間とか
らプラグ単体長さＬｐを演算で求め、さらに上記プラグ
長さＬｐと、管路内の断面積とから求められた任意の計
測時間Ｔにおけるプラグ体積Ｖｐの合計ΣＶｐにより、
そのプラグ流量Ｑｐを、Ｑｐ＝ΣＶｐ／Ｔで求めること
を特徴としたものである。In order to achieve the above object, a method for measuring a plug flow of sediment according to the present invention is arranged such that a predetermined interval L is set near a discharge port of a conduit for sending mixed pressure of sediment. The speed Fp of the single plug is obtained from the time difference in the pressure waveform in the conduit of the single plug measured by the pressure gauges provided at the single fixed points, and the speed Fp of the single plug and the above two fixed points The length Lp of the plug unit is calculated from the time when the plug unit passes either of them, and further, the plug volume Vp at an arbitrary measurement time T obtained from the plug length Lp and the cross-sectional area in the conduit is calculated. By the total ΣVp,
It is characterized in that the plug flow rate Qp is obtained by Qp = ΣVp / T.
【０００８】[0008]
【作 用】上記の計測方法によれば、管路内の所定間隔
をおいて２点の圧力計により、プラグ流の管内圧力の変
動を同時に計測し、圧力波形の時間差からプラグ単体の
速度を求めるとともに、プラグ単体の計測点通過時間か
らプラグ単体の長さ及び体積を算出し、また計測時間に
通過するプラグ数を計測することによりプラグ流流量を
算定することができる。[Operation] According to the above measuring method, the fluctuation of the plug pressure in the pipe is measured at the same time by two pressure gauges at a predetermined interval in the pipe, and the speed of the plug alone is calculated from the time difference of the pressure waveform. In addition to the calculation, the plug flow rate can be calculated by calculating the length and volume of the plug alone from the measurement point passage time of the plug alone, and by measuring the number of plugs that pass during the measurement time.
【０００９】[0009]
【実施例】以下図面を参照して本発明の方法を適用した
実施例を説明するが、図１は本発明の流量計測方法を適
用して土砂を混気圧送する混気圧送管路の一実施例の概
略構成図、図２は図１の管路内のプラグの各時間ごとの
移動を示す説明図、図３は図２のプラグ移動時の管路内
の各圧力計の圧力変動を示す圧力と時間との関係線図で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the method of the present invention is applied will be described below with reference to the drawings. FIG. 1 shows an example of a mixed pressure feeding pipe line for feeding mixed pressure of soil by applying the flow rate measuring method of the present invention. FIG. 2 is a schematic configuration diagram of the embodiment, FIG. 2 is an explanatory diagram showing movement of the plug in the pipeline in FIG. 1 with respect to time, and FIG. 3 shows pressure fluctuation of each pressure gauge in the pipeline when the plug is moved in FIG. It is a relationship diagram of the pressure and time shown.
【００１０】まず、図１においては、例えば海底の軟泥
などの土砂を浚渫する例を示しているが、この場合、軟
泥を浚渫する浚渫船１により浚渫した軟泥または軟泥圧
送船２により送り出された軟泥をパイプラインなどの管
路３に渦巻ポンプ４により送り出し、その管路３内の軟
泥に対して空気圧縮機５により圧縮空気を注入し、管路
３内にプラグＰと圧縮空気Ａとからなる混気圧送のプラ
グ流を形成し、所定の埋立地１０などにこの軟泥を圧送
するものである。First, although FIG. 1 shows an example of dredging earth and sand such as seabed soft mud, in this case, the soft mud dredged by the dredger 1 dredging the soft mud or the soft mud sent out by the soft mud pressure vessel 2. Is sent to a pipeline 3 such as a pipeline by a centrifugal pump 4, compressed air is injected into the soft mud in the pipeline 3 by an air compressor 5, and a plug P and compressed air A are provided in the pipeline 3. A plug flow of mixed pressure is formed, and the soft mud is pressure-fed to a predetermined landfill 10 or the like.
【００１１】そこで、この管路３の吐出口付近に、図２
に示すごとく、所定の間隔Ｌ (ｍ)をおいた２つの定点
Ｘ，Ｙに各圧力計６，７を設けており、この圧力計６，
７による管内圧力のそれぞれの計測結果を記録・分析装
置８に伝送し、ＣＲＴ画面や記録紙などに出力する。次
に、図２においてプラグＰの単体の各定点Ｘ，Ｙの通過
は図３に示すように圧力波計に表われるので、この圧力
波形の各圧力計６，７での時間差 (Ｔ2 −Ｔ 0 ) からプ
ラグ単体の速度Ｆｐ (ｍ／ｓ) は、Ｆｐ＝Ｌ／ (Ｔ2 −
Ｔ0 ) で算出される。Therefore, in the vicinity of the discharge port of the pipe line 3, as shown in FIG.
As shown in, two fixed points with a predetermined interval L (m)
The pressure gauges 6 and 7 are provided on X and Y, respectively.
Record / analyze each measurement result of pipe pressure by 7.
It is transmitted to the storage device 8 and output on a CRT screen or recording paper. Next
In FIG. 2, passage of each fixed point X, Y of the plug P alone
Appears on the pressure wave meter as shown in Fig. 3, so this pressure
Waveform time difference at each pressure gauge 6, 7 (T2-T 0) From
The velocity Fp (m / s) of the lug alone is Fp = L / (T2−
T0) Is calculated.
【００１２】さらに、定点ＸをプラグＰ単体が通過する
時間 (Ｔ1 −Ｔ0 ) とプラグ流速度Ｆｐとが分るので、
プラグ単体長さＬｐ (ｍ) は、Ｌｐ＝Ｆｐ× (Ｔ1 −Ｔ
0 )で求められる。なお、定点Ｙをプラグ単体が通過す
る時間からプラグ単体長さＬｐを求めることもできる。
次に、管路３の断面積をＡ (ｍ2) とすれば、プラグＰ
単体の体積Ｖｐ (ｍ3)は、Ｖｐ＝Ｌｐ×Ａで求められ
る。Furthermore, since the time (T 1 -T 0 ) for the plug P to pass the fixed point X and the plug flow velocity Fp are known,
The plug length Lp (m) is Lp = Fp × (T 1 −T
0 ) is required. The plug length Lp can also be calculated from the time taken for the plug to pass through the fixed point Y.
Next, if the cross-sectional area of the conduit 3 is A (m 2 ), the plug P
The volume Vp (m 3 ) of the simple substance is obtained by Vp = Lp × A.
【００１３】そこで、前記各式の演算を任意の計測時間
Ｔ (hr) について行ない、プラグ体積Ｖｐの合計ΣＶｐ
を求めることにより、プラグ流の流量Ｑｐ (ｍ3／hr)
は、Ｑｐ＝ΣＶｐ／Ｔで求められる。Therefore, the above equations are calculated for an arbitrary measurement time T (hr) to obtain the total plug volume Vp ΣVp.
The flow rate of the plug flow Qp (m 3 / hr)
Is calculated by Qp = ΣVp / T.
【００１４】[0014]
【発明の効果】以上に説明した本発明の流量計測方法に
よれば、管路内を混気圧送されるプラグ流の土砂の流量
をリアルタイムにて計測可能となり、土砂圧送時の圧送
土砂流量の算定が瞬時に算定でき、その作業能率を適格
に把握できるという効果がある。また、本発明では混気
圧送の管路に２個の圧力計を設けるだけの簡単な機器の
追加で大きな効果が得られるという利点がある。According to the flow rate measuring method of the present invention described above, it becomes possible to measure in real time the flow rate of the earth and sand in the plug flow that is mixed and pressure-fed in the pipeline, and the flow rate of the pressure-fed earth and sand during pressure-feeding The calculation can be done instantly, and the work efficiency can be grasped appropriately. Further, according to the present invention, there is an advantage that a great effect can be obtained by adding a simple device in which only two pressure gauges are provided in the mixed pressure feeding pipe.
【図１】本発明の流量計測方法を適用して土砂を混気圧
送する混気圧送管路の一実施例の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment of a mixed pressure feeding pipe for sending mixed pressure of soil by applying the flow rate measuring method of the present invention.
【図２】図１の管路内のプラグの各時間ごとの移動を示
す説明図である。FIG. 2 is an explanatory diagram showing movement of a plug in the conduit of FIG. 1 for each time period.
【図３】図２のプラグ移動時の管路内の各圧力計の圧力
変動を示す圧力と時間との関係線図である。FIG. 3 is a relational diagram of pressure and time showing pressure fluctuation of each pressure gauge in the pipe when the plug of FIG. 2 is moved.
３ 管路 ４ 渦巻ポンプ ５ 空気圧縮機 ６, ７ 圧力計 ８ 記録・分析装置 Ａ 圧縮空気 Ｐ プラグ 3 Pipe line 4 Volute pump 5 Air compressor 6, 7 Pressure gauge 8 Recording / analyzing device A Compressed air P plug
───────────────────────────────────────────────────── フロントページの続き (72)発明者 泉 信也 山口県下関市長府松小田東町６−３ 東亜 建設工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Izumi 6-3 Matsuoda Higashicho, Chofu City, Shimonoseki City, Yamaguchi Prefecture Toa Construction Industry Co., Ltd.
Claims (1)
所定の間隔Ｌをおいた２つの定点に設けた各圧力計によ
り計測される１つのプラグ単体の管路内の圧力波形での
時間差からプラグ単体の速度Ｆｐを求め、このプラグ単
体の速度Ｆｐと、上記２つの定点のうちのいずれかをプ
ラグ単体が通過する時間とからプラグ単体長さＬｐを演
算で求め、さらに上記プラグ長さＬｐと管路内の断面積
とから求められた任意の計測時間Ｔにおけるプラグ体積
Ｖｐの合計ΣＶｐにより、そのプラグ流量Ｑｐを、Ｑｐ
＝ΣＶｐ／Ｔで求める土砂プラグ流の流量計測方法。1. The vicinity of the discharge port of the pipeline for sending mixed pressure of earth and sand,
The speed Fp of the single plug is calculated from the time difference in the pressure waveform in the conduit of the single plug measured by the pressure gauges provided at the two fixed points with the predetermined interval L, and the speed Fp of the single plug is obtained. , The plug length Lp is calculated from the time for which the plug unit passes one of the two fixed points, and any measurement obtained from the plug length Lp and the cross-sectional area in the conduit. By the total ΣVp of the plug volume Vp at the time T, the plug flow rate Qp is
= Method of measuring the flow rate of the plug flow of earth and sand determined by ΣVp / T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25640892A JP3184999B2 (en) | 1992-09-25 | 1992-09-25 | Flow measurement method of earth and sand plug flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25640892A JP3184999B2 (en) | 1992-09-25 | 1992-09-25 | Flow measurement method of earth and sand plug flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06109511A true JPH06109511A (en) | 1994-04-19 |
| JP3184999B2 JP3184999B2 (en) | 2001-07-09 |
Family
ID=17292269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25640892A Expired - Fee Related JP3184999B2 (en) | 1992-09-25 | 1992-09-25 | Flow measurement method of earth and sand plug flow |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184999B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6813588B1 (en) | 2003-03-31 | 2004-11-02 | Honeywell International Inc. | Control system and method for detecting plugging in differential pressure cells |
| US6904386B2 (en) | 2002-10-07 | 2005-06-07 | Honeywell International Inc. | Control system and method for detecting plugging in differential pressure cells |
| JP2007071560A (en) * | 2005-09-05 | 2007-03-22 | Tokyo Univ Of Science | Earth and sand measuring apparatus |
-
1992
- 1992-09-25 JP JP25640892A patent/JP3184999B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6904386B2 (en) | 2002-10-07 | 2005-06-07 | Honeywell International Inc. | Control system and method for detecting plugging in differential pressure cells |
| US6813588B1 (en) | 2003-03-31 | 2004-11-02 | Honeywell International Inc. | Control system and method for detecting plugging in differential pressure cells |
| JP2007071560A (en) * | 2005-09-05 | 2007-03-22 | Tokyo Univ Of Science | Earth and sand measuring apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3184999B2 (en) | 2001-07-09 |
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