JP3253504B2 - Air injection type sewage pumping line - Google Patents
Air injection type sewage pumping lineInfo
- Publication number
- JP3253504B2 JP3253504B2 JP28905295A JP28905295A JP3253504B2 JP 3253504 B2 JP3253504 B2 JP 3253504B2 JP 28905295 A JP28905295 A JP 28905295A JP 28905295 A JP28905295 A JP 28905295A JP 3253504 B2 JP3253504 B2 JP 3253504B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- pipeline
- pipe
- liquid
- sewage pumping
- 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.)
- Expired - Fee Related
Links
Landscapes
- Sewage (AREA)
- Pipeline Systems (AREA)
- Degasification And Air Bubble Elimination (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は空気注入式の汚水圧
送管路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air injection type sewage pumping line.
【0002】[0002]
【従来の技術】圧送管路を用いて汚水を圧送する場合に
は、圧送管路内が嫌気状態になることによる硫化水素の
発生が問題となる。この硫化水素の発生を防止するため
の対策として、汚水圧送管路内へ空気を注入して、管路
内が嫌気状態とならないようにすることが行われてい
る。2. Description of the Related Art When sewage is pumped by using a pumping line, generation of hydrogen sulfide due to an anaerobic state in the pumping line becomes a problem. As a countermeasure for preventing the generation of hydrogen sulfide, air is injected into a sewage pumping pipeline to prevent the pipeline from becoming anaerobic.
【0003】[0003]
【発明が解決しようとする課題】しかし、このように管
路内に空気を注入すると、たしかに硫化水素の発生は抑
制されるが、管路内の流れが気液二相流となるため、汚
水のみが満管状態で流れる場合と比較して、一般に圧力
損失が増大するという問題点がある。However, when air is injected into the pipe as described above, generation of hydrogen sulfide is certainly suppressed, but since the flow in the pipe becomes a gas-liquid two-phase flow, sewage In general, there is a problem that the pressure loss increases as compared with the case where only the full tube flows.
【0004】特に下り勾配区間においては気相と液相と
が完全に分離した自然流下の状態となり、その区間の損
失圧力水頭は流下した高低差に等しくなると考えられ
る。このため、管路全体での圧力損失の中で、この下り
勾配区間の圧力損失が占める割合が大きくなるという問
題点がある。[0004] In particular, in the downward slope section, the gas phase and the liquid phase are in a state of natural flow completely separated from each other, and the pressure loss head in that section is considered to be equal to the height difference flowing down. For this reason, there is a problem that the ratio of the pressure loss in the downward slope section to the pressure loss in the entire pipeline increases.
【0005】そこで本発明はこのような問題点を解決
し、空気の注入によって気液二相流となる汚水圧送管路
において、下り勾配部で大きな圧力損失が生じないよう
にすることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent a large pressure loss from being generated in a down-slope section in a sewage pumping line which becomes a gas-liquid two-phase flow by injecting air. I do.
【0006】[0006]
【課題を解決するための手段】この目的を達成するため
本発明は、空気が注入されることで気液二相流が圧送さ
れる汚水圧送管路において、この管路の下り勾配部の手
前で管路内の空気と汚水とを分離する手段と、この分離
手段によって分離された空気を前記下り勾配部をバイパ
スさせるバイパス管路と、このバイパス管路からの空気
を管路の下り勾配部の終端部よりも下流側に強制的に再
注入させるベンチュリ管とを設けたものである。SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to a sewage pumping line in which a gas-liquid two-phase flow is pumped by injecting air, before a downwardly inclined portion of the line. Means for separating the air and sewage in the pipeline by a bypass, a bypass pipe for bypassing the air separated by the separation means to the downgraded section, and a downgraded section of the pipeline from the air from the bypass pipe. And a Venturi tube forcibly re-injecting it downstream from the terminal end of the pipe.
【0007】このような構成であると、管路の下り勾配
部の手前で管路内の気液二相流から空気がバイパス管路
に分離され、この下り勾配部では汚水のみが流されるた
め、その圧力損失は満管時と同等になり、大きな圧力損
失は生じない。またバイパス管路からの空気をベンチュ
リ管によって管路の下り勾配部の終端部よりも下流側に
再注入させるため、それよりも下流側では下り勾配部の
手前側と同様に気液二相流が圧送されることになるとと
もに、再注入のために特別な動力装置は不要である。With this configuration, air is separated from the gas-liquid two-phase flow in the pipeline to the bypass pipeline just before the downward gradient in the pipeline, and only sewage flows in the downward gradient. The pressure loss is equal to that when the vessel is full, and no large pressure loss occurs. In addition, since the air from the bypass pipe is re-injected by the Venturi pipe downstream of the end of the downgraded section of the pipe, the gas-liquid two-phase flow downstream of this is the same as the upstream side of the downgraded section. Will be pumped, and no special power unit is required for reinfusion.
【0008】[0008]
【発明の実施の形態】図1において、1は汚水圧送管路
であり、実質的に水平な方向に設置されている。この管
路1は、大きく傾斜した下り勾配部2を有している。下
り勾配部2よりも上流側における管路1の内部では、空
気が注入された汚水が気液二相流3となって加圧状態で
圧送されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a sewage pumping line, which is installed in a substantially horizontal direction. The pipeline 1 has a downwardly inclined portion 2 that is greatly inclined. Inside the pipe line 1 on the upstream side of the downgraded portion 2, the sewage into which air has been injected is sent as a gas-liquid two-phase flow 3 and is pressure-fed under pressure.
【0009】管路1における下り勾配部2の直前には、
管路1内の空気を抜くための空気弁4が設置されてい
る。この空気弁4には、管路1から抜かれた空気を通す
ためのバイパス管路5の一端部が接続され、このバイパ
ス管路5は、管路1の下り勾配部2に沿って配置されて
いる。Immediately before the downward slope 2 in the pipeline 1,
An air valve 4 for bleeding air from the pipeline 1 is provided. The air valve 4 is connected to one end of a bypass pipe 5 for passing the air extracted from the pipe 1, and the bypass pipe 5 is arranged along the downward slope 2 of the pipe 1. I have.
【0010】管路1における下り勾配部2の終端部より
も下流側にはベンチュリ管6が設けられており、バイパ
ス管路5の他端部は、このベンチュリ管6の絞り部7に
連通されている。A Venturi pipe 6 is provided downstream of the end of the downward slope 2 in the pipe 1, and the other end of the bypass pipe 5 is communicated with a throttle 7 of the Venturi pipe 6. ing.
【0011】このような構成によれば、下り勾配部2よ
りも上流側における管路1の内部を流れてきた気液二相
流3に含まれる空気8は、空気弁4により分離されて、
管路1からバイパス管路5へ排出される。したがって下
り勾配部2には、このようにして空気が分離された汚水
のみが液相満管流9として流れ、このため、この下り勾
配部における圧力損失が、気液二相流を流す場合に比べ
格段に軽減されることになる。このため、下り勾配部2
に気液二相流を流す場合に比べ、圧送用のポンプの所要
動力を低減することができる。According to such a configuration, the air 8 contained in the gas-liquid two-phase flow 3 flowing through the inside of the pipeline 1 on the upstream side of the downgraded portion 2 is separated by the air valve 4,
It is discharged from the pipe 1 to the bypass pipe 5. Therefore, only the sewage from which the air has been separated in this way flows as the liquid full tube flow 9 into the downward slope 2, and the pressure loss in this downward slope causes the gas-liquid two-phase flow to flow. It will be significantly reduced. For this reason, the descending slope section 2
The required power of the pump for pressure feeding can be reduced as compared with the case where a gas-liquid two-phase flow is caused to flow through the pump.
【0012】空気弁8によって管路1から排出された空
気は、並行してバイパス管路5内を流れる。そして、ベ
ンチュリ管6の絞り部7においては、内部の汚水の圧力
が低下するため、バイパス管路5内との間に差圧が生じ
て、この差圧によりバイパス管路5からベンチュリ管6
の中へ空気が送り出される。すなわち、管路1における
下り勾配部2の終端部よりも下流側に空気が強制的に再
注入されることになる。したがって、この部分よりも下
流側では、再び気液二相流3が圧送されることになっ
て、硫化水素の発生が防止される。The air discharged from the pipe 1 by the air valve 8 flows in the bypass pipe 5 in parallel. Then, in the throttle portion 7 of the venturi pipe 6, the pressure of the internal sewage drops, so that a pressure difference is generated between the inside of the bypass pipe 5 and the pressure difference between the inside of the bypass pipe 5.
Air is blown into the. That is, the air is forcibly re-injected downstream of the end of the downward slope 2 in the pipeline 1. Therefore, on the downstream side of this part, the gas-liquid two-phase flow 3 is pumped again, and the generation of hydrogen sulfide is prevented.
【0013】なお、このようにベンチュリ管6を利用し
て空気を強制的に再注入しているため、空気弁4の設置
位置よりも下流側かつ鉛直方向の下側に位置すること
で、この空気弁4の設置位置よりも管路内圧力が上昇し
ている部分に、容易に空気を再注入することができる。
またベンチュリ管6を利用して差圧により空気の再注入
を行うものであるため、特別な動力装置を必要としない
利点がある。Since the air is forcibly re-injected by using the venturi tube 6 as described above, the air is located downstream from the installation position of the air valve 4 and vertically below the air valve 4. Air can be easily re-injected into the portion where the pressure in the pipeline is higher than the installation position of the air valve 4.
Further, since the air is re-injected by the differential pressure using the Venturi tube 6, there is an advantage that no special power unit is required.
【0014】以上述べたように本発明によると、汚水圧
送管路の下り勾配部の手前で管路内の空気と汚水とを分
離する手段と、この分離手段によって分離された空気を
前記下り勾配部をバイパスさせるバイパス管路と、この
バイパス管路からの空気を管路の下り勾配部の終端部よ
りも下流側に再注入させるベンチュリ管とを設けたた
め、管路の下り勾配部では液相のみを液相満管流として
圧送することができ、このため、この下り勾配部におけ
る圧力損失を気液二相流を流す場合に比べて軽減させる
ことができ、またベンチュリ管によって空気の強制的な
再注入を行うものであるため、それよりも下流側では再
び気液二相流を圧送させることができて、硫化水素の発
生を防止できるとともに、特別な動力装置を必要とせず
に再注入を行うことができる。As described above, according to the present invention, means for separating the air and sewage in the pipeline before the downgraded portion of the sewage pumping pipeline, A bypass pipe for bypassing the section and a venturi pipe for re-injecting the air from this bypass pipe downstream of the end of the downgraded section of the pipe are provided. Can be pumped as a liquid full tube flow, so that the pressure loss in this downward slope can be reduced as compared with the case of flowing a gas-liquid two-phase flow, and forced air is forced by a venturi tube. Since re-injection is performed, the gas-liquid two-phase flow can be again pumped downstream from the injection, preventing the generation of hydrogen sulfide and requiring a special power unit. Reinjection without Door can be.
【図1】本発明にもとづく空気注入式の汚水圧送管路の
実施の一形態を示す概略図である。FIG. 1 is a schematic view showing an embodiment of an air injection type sewage pumping line according to the present invention.
1 汚水圧送管路 2 下り勾配部 3 気液二相流 4 空気弁 5 バイパス管路 6 ベンチュリ管 DESCRIPTION OF SYMBOLS 1 Sewage pumping line 2 Downhill slope 3 Gas-liquid two-phase flow 4 Air valve 5 Bypass line 6 Venturi tube
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平4−258424(JP,A) 特開 平5−202554(JP,A) 特開 昭62−297593(JP,A) 特開 平4−131439(JP,A) 特許3139928(JP,B2) (58)調査した分野(Int.Cl.7,DB名) F17D 1/20 B01D 19/00 C02F 1/00 E03F 3/02 E03F 7/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-258424 (JP, A) JP-A-5-202554 (JP, A) JP-A-62-297593 (JP, A) 131439 (JP, A) Patent 3139928 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) F17D 1/20 B01D 19/00 C02F 1/00 E03F 3/02 E03F 7/00
Claims (1)
される汚水圧送管路において、この管路の下り勾配部の
手前で管路内の空気と汚水とを分離する手段と、この分
離手段によって分離された空気を前記下り勾配部をバイ
パスさせるバイパス管路と、このバイパス管路からの空
気を管路の下り勾配部の終端部よりも下流側に強制的に
再注入させるベンチュリ管とを設けたことを特徴とする
空気注入式の汚水圧送管路。A means for separating air and sewage in the pipeline in front of a downward slope of the pipeline in a sewage pumping pipeline in which a gas-liquid two-phase flow is pumped by injection of air; a bypass line the air separated by the separating means to bypass the descending slope portion, forcing the downstream side of the end portion of the down slope portion of the air duct from the bypass conduit <br / > An air-injection type sewage pumping line provided with a venturi tube for re-injection.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28905295A JP3253504B2 (en) | 1995-11-08 | 1995-11-08 | Air injection type sewage pumping line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28905295A JP3253504B2 (en) | 1995-11-08 | 1995-11-08 | Air injection type sewage pumping line |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09133300A JPH09133300A (en) | 1997-05-20 |
JP3253504B2 true JP3253504B2 (en) | 2002-02-04 |
Family
ID=17738207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28905295A Expired - Fee Related JP3253504B2 (en) | 1995-11-08 | 1995-11-08 | Air injection type sewage pumping line |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3253504B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6462227B2 (en) * | 2014-03-10 | 2019-01-30 | 泰熙 射場 | Equipment for eliminating gas accumulation in piping, tanks or equipment |
-
1995
- 1995-11-08 JP JP28905295A patent/JP3253504B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH09133300A (en) | 1997-05-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |