JP3725221B2 - Condensate recovery device - Google Patents

Condensate recovery device Download PDF

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Publication number
JP3725221B2
JP3725221B2 JP29194795A JP29194795A JP3725221B2 JP 3725221 B2 JP3725221 B2 JP 3725221B2 JP 29194795 A JP29194795 A JP 29194795A JP 29194795 A JP29194795 A JP 29194795A JP 3725221 B2 JP3725221 B2 JP 3725221B2
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JP
Japan
Prior art keywords
water supply
condensate
temperature
supply tank
steam
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
Application number
JP29194795A
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Japanese (ja)
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JPH09112808A (en
Inventor
一明 菅野
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Tlv Co Ltd
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Tlv Co Ltd
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Filing date
Publication date
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Priority to JP29194795A priority Critical patent/JP3725221B2/en
Publication of JPH09112808A publication Critical patent/JPH09112808A/en
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Anticipated expiration legal-status Critical
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Description

【0001】
【産業上の利用分野】
本発明は、蒸気使用機器等で発生した凝縮水としての復水をボイラ―等へ回収する復水回収装置に関する。蒸気使用機器で発生する復水は一般にスチ―ムトラップを介して排出される。排出される復水は通常高圧蒸気の復水であり、まだ高温の熱エネルギ―を有しており、この熱エネルギ―の有効利用を図るために復水の回収が行なわれている。
【0002】
【従来の技術】
従来の復水回収装置を図2により説明する。ボイラ―1で発生した高圧蒸気を蒸気使用機器2が消費することにより凝縮水としての復水が発生し、その復水はスチ―ムトラップ3を経てヘッダ―4に至る。ヘッダ―4の上部を一次圧力調整弁13と管路14を介して給水タンク11と連通することにより、ヘッダ―4内圧力が所定以上に上昇すると一次圧力調整弁13が開弁してその圧力を抜くことで圧力勾配を形成して蒸気使用機器2内に復水を滞留しないものである。ヘッダ―4はエゼクタ5と接続されて循環路6を介して循環ポンプ7と連通する。循環ポンプ7とエゼクタ5と循環路6とで復水回収ポンプを構成する。循環路6が分岐して復水回収管路8と接続され、更に一部が弁9を介してボイラ―1と接続すると共に、弁10を介して給水タンク11とも接続するものである。
【0003】
循環ポンプ7により復水を循環させることによってエゼクタ5に吸引力を発生させ、ヘッダ―4からの復水を吸引すると共に、吸引した復水をボイラ―1あるいは給水タンク11へ回収し、給水タンク11内の復水は更に給水ポンプ12でもってボイラ―1へ回収することにより、熱エネルギ―の有効利用を図るものである。
【0004】
【本発明が解決しようとする課題】
上記従来のものでは、多量の高温復水を回収した場合に、給水タンク11内の液温が過度に上昇して、給水タンク11から大量の復水が再蒸発蒸気として大気中へ蒸発してしまい熱エネルギ―の損失を生じる問題、あるいは、流体温度が高くて給水ポンプ12がキャビテ―ションを起こしてポンプが騒音を発生したり振動したりあるいは腐食損傷してしまう問題があった。
【0005】
給水タンク11は通常大気開放状態で設置されるために、高温復水が溜ると大量の再蒸発蒸気が発生するのである。また、給水ポンプ12は流体の温度が通常80度C以上程度になると、ポンプ内で蒸気泡が発生してキャビテ―ションを発生するのである。
【0006】
従って本発明の技術的課題は、高温復水を多量に回収する場合においても、給水タンクからの再蒸発蒸気の発生を少なくして熱エネルギ―の損失を押えると共に、給水ポンプでキャビテ―ションを生じることのない復水回収装置を得ることである。
【0007】
【課題を解決する為の手段】
本発明の復水回収装置の構成は次の通りである。蒸気使用機器で発生した復水を復水回収ポンプにより、ボイラ―あるいは給水タンク等の復水回収先へ圧送するものにおいて、給水タンクに冷却水を供給する冷却水供給管と、給水タンク内の液温を検出する温度検出手段を設けて、当該給水タンク内の液温を所定温度に維持すると共に、給水タンク内の流体を復水回収ポンプの復水流入側に注入するタンク流体注入手段を設けたものである。
【0008】
【作用】
温度検出手段と冷却水供給管により給水タンク内の流体温度を所定温度、例えば60度Cから70度C程度に維持することにより、給水タンクからの復水の再蒸発を押えると共に、給水ポンプでキャビテ―ションを生じることもない。
【0009】
所定温度の給水タンク内流体を復水回収ポンプの復水流入側に注入することにより、蒸気使用機器及びスチ―ムトラップと、復水回収ポンプの間に温度差に応じた圧力勾配を形成することができ、蒸気使用機器とスチ―ムトラップから排出された復水をこの圧力勾配によって、スム―ズに滞留することなく復水回収ポンプに吸引することができる。
【0010】
【実施例】
図1により本発明の実施例を詳細に説明する。
本実施例においては図2に示す従来技術と同一部材には同一符号を付す。
【0011】
蒸気使用機器2の出口側にスチ―ムトラップ3を介してヘッダ―4を接続する。ヘッダ―4とエゼクタ5を接続し、エゼクタ5は循環路6を介して循環ポンプ7と接続する。エゼクタ5と循環路6と循環ポンプ7とで復水回収ポンプを構成する。循環路6を分岐して復水回収管路8を接続し、弁9を介してボイラ―1と接続すると共に、弁10を介して給水タンク11の上部に接続する。給水タンク11は上部が大気へ開放されているものである。給水タンク11とボイラ―1の間に給水ポンプ12を配置する。給水ポンプ12はボイラ―1内の水位が低水位まで低下した場合に駆動して給水タンク11内の低温復水をボイラ―1へ供給するものである。
【0012】
給水タンク11の上部に自動調節弁15を介して冷却水供給管16を連通する。給水タンク11の下部にはタンク内の流体温度を検出する温度検出手段としての温度センサ―17を取り付ける。温度センサ―17と自動調節弁15はそれぞれ温度コントロ―ラ18と接続して、給水タンク11内の液温を所定温度範囲に制御する。
【0013】
給水タンク11の下部から管路19と注入ポンプ20と自動弁21を介してヘッダ―4の上部と接続する。これらの管路19と注入ポンプ20と自動弁21とでタンク流体注入手段を構成する。本実施例においては、給水タンク11内の流体をヘッダ―4の上部に注入する例を示したが、ヘッダ―を用いることなく、スチ―ムトラップ3からエゼクタ5の間の管路に注入したり、あるいは、ヘッダ―4に替えて密閉タンクを配置してその中に注入することもできる。
【0014】
次に作用を説明する。
蒸気使用機器2で発生した復水はスチ―ムトラップ3を経てヘッダ―4に至りエゼクタ5に吸引され、一部が循環ポンプ7により循環路6を循環すると共に、一部の復水は復水回収管路8と弁9を経てボイラ―1に供給され、再度蒸気となって蒸気使用機器2へ供給される。
【0015】
給水タンク11内の液温は温度センサ―17で検出され温度コントロ―ラ18と自動調節弁15により所定温度、例えば60度C、に維持される。従って、給水タンク11上部から大量の再蒸発蒸気が放散することがないと共に、給水ポンプ12がキャビテ―ションを起こすこともない。
【0016】
給水タンク11の所定温度に制御された流体は、管路19と注入ポンプ20と自動弁21からヘッダ―4に供給され、ヘッダ―4内を所定温度まで降温させる。ヘッダ―4内の温度が所定温度まで低くなることにより、蒸気使用機器2とヘッダ―4の間に温度勾配、すなわち圧力勾配ができて、蒸気使用機器2内で生じた復水は滞留することなくスチ―ムトラップ3を経てヘッダ―4内に流下する。
【0017】
【発明の効果】
本発明は次のような効果を奏する。
給水タンク内の流体温度を所定値に維持することにより、給水タンクからの大量の再蒸発蒸気の放散を防止して熱エネルギ―の損失を防ぐことができ、且つ、給水ポンプでキャビテ―ションを生じることもない。
【0018】
所定温度の給水タンクの流体をタンク流体注入手段によって復水回収ポンプの復水流入側に注入することにより、蒸気使用機器及びスチ―ムトラップと復水回収ポンプの間に必要な圧力勾配をつくることができ、蒸気使用機器で発生した復水をスチ―ムトラップを介してスム―ズに復水回収ポンプで吸引することができ、蒸気使用機器に復水を滞留することがない。
【図面の簡単な説明】
【図1】本発明の復水回収装置の実施例の構成図である。
【図2】従来例の復水回収装置の構成図である。
【符号の説明】
1 ボイラ―
2 蒸気使用機器
3 スチ―ムトラップ
4 ヘッダ―
5 エゼクタ
6 循環路
7 循環ポンプ
8 復水回収管路
11 給水タンク
12 給水ポンプ
16 冷却水供給管
17 温度センサ―
18 温度コントロ―ラ
20 注入ポンプ
[0001]
[Industrial application fields]
The present invention relates to a condensate recovery device that recovers condensate as condensed water generated in steam-using equipment or the like to a boiler or the like. Condensate generated from steam-using equipment is generally discharged through a steam trap. The discharged condensate is usually high-pressure steam condensate, and still has high-temperature heat energy, and condensate is collected for effective use of this heat energy.
[0002]
[Prior art]
A conventional condensate recovery apparatus will be described with reference to FIG. Condensate as condensed water is generated when the steam-using device 2 consumes the high-pressure steam generated in the boiler 1, and the condensed water reaches the header 4 via the steam trap 3. By communicating the upper part of the header 4 with the water supply tank 11 via the primary pressure regulating valve 13 and the pipe line 14, when the pressure in the header 4 rises to a predetermined level or more, the primary pressure regulating valve 13 is opened and the pressure is increased. The pressure gradient is formed by pulling out the condensate so that the condensate does not stay in the steam using device 2. The header 4 is connected to the ejector 5 and communicates with the circulation pump 7 through the circulation path 6. The circulation pump 7, the ejector 5, and the circulation path 6 constitute a condensate recovery pump. The circulation path 6 is branched and connected to the condensate recovery line 8, and a part of the circulation path 6 is connected to the boiler 1 via the valve 9 and also connected to the water supply tank 11 via the valve 10.
[0003]
Circulation of the condensate with the circulation pump 7 generates suction force in the ejector 5 and sucks the condensate from the header 4 and collects the sucked condensate into the boiler 1 or the feed water tank 11. The condensate in 11 is further collected by the feed water pump 12 to the boiler 1 to effectively use the heat energy.
[0004]
[Problems to be solved by the present invention]
In the above conventional apparatus, when a large amount of high-temperature condensate is collected, the liquid temperature in the water supply tank 11 rises excessively, and a large amount of condensate evaporates from the water supply tank 11 into the atmosphere as re-evaporated vapor. Therefore, there is a problem that heat energy is lost, or that the fluid temperature is high and the water supply pump 12 causes cavitation, causing the pump to generate noise, vibrate, or corrode damage.
[0005]
Since the water supply tank 11 is usually installed in an open state to the atmosphere, a large amount of reevaporated steam is generated when high-temperature condensate accumulates. In addition, when the temperature of the fluid in the water supply pump 12 is normally about 80 ° C. or higher, steam bubbles are generated in the pump to generate cavitation.
[0006]
Therefore, the technical problem of the present invention is that even when recovering a large amount of high-temperature condensate, the generation of reevaporated steam from the water supply tank is reduced to suppress the loss of heat energy, and the cavitation is performed by the water supply pump. It is to obtain a condensate recovery device that does not occur.
[0007]
[Means for solving the problems]
The condensate recovery apparatus of the present invention has the following configuration. Condensate generated from steam-using equipment is pumped by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank. A cooling water supply pipe for supplying cooling water to the water supply tank, and a water supply tank There is provided a temperature detecting means for detecting the liquid temperature to maintain the liquid temperature in the water supply tank at a predetermined temperature, and tank fluid injection means for injecting the fluid in the water supply tank to the condensate inflow side of the condensate recovery pump. It is provided.
[0008]
[Action]
By maintaining the fluid temperature in the water supply tank at a predetermined temperature, for example, about 60 ° C. to 70 ° C. by the temperature detection means and the cooling water supply pipe, the re-evaporation of the condensate from the water supply tank can be suppressed and the water supply pump There is no cavitation.
[0009]
Forming a pressure gradient according to the temperature difference between the equipment using steam and the steam trap and the condensate recovery pump by injecting the fluid in the water supply tank at the specified temperature into the condensate inflow side of the condensate recovery pump The condensate discharged from the steam-using device and the steam trap can be sucked into the condensate recovery pump by this pressure gradient without staying in the smooth.
[0010]
【Example】
An embodiment of the present invention will be described in detail with reference to FIG.
In the present embodiment, the same members as those in the prior art shown in FIG.
[0011]
A header 4 is connected to the outlet side of the steam using device 2 through a steam trap 3. The header 4 is connected to the ejector 5, and the ejector 5 is connected to the circulation pump 7 through the circulation path 6. The ejector 5, the circulation path 6, and the circulation pump 7 constitute a condensate recovery pump. The circulation path 6 is branched and a condensate recovery pipe line 8 is connected, connected to the boiler 1 via a valve 9 and connected to the upper part of the water supply tank 11 via a valve 10. The upper part of the water supply tank 11 is open to the atmosphere. A water supply pump 12 is disposed between the water supply tank 11 and the boiler 1. The feed water pump 12 is driven when the water level in the boiler 1 is lowered to a low water level, and supplies low-temperature condensate in the feed water tank 11 to the boiler 1.
[0012]
A cooling water supply pipe 16 is communicated with the upper part of the water supply tank 11 via an automatic control valve 15. A temperature sensor 17 as temperature detecting means for detecting the fluid temperature in the tank is attached to the lower part of the water supply tank 11. The temperature sensor 17 and the automatic control valve 15 are respectively connected to a temperature controller 18 to control the liquid temperature in the water supply tank 11 within a predetermined temperature range.
[0013]
The lower part of the water supply tank 11 is connected to the upper part of the header 4 through a pipe line 19, an injection pump 20 and an automatic valve 21. These pipe line 19, injection pump 20, and automatic valve 21 constitute tank fluid injection means. In this embodiment, the example in which the fluid in the water supply tank 11 is injected into the upper portion of the header 4 has been shown. However, the fluid can be injected into the pipe line between the steam trap 3 and the ejector 5 without using the header. Alternatively, a sealed tank can be placed in place of the header 4 and injected into it.
[0014]
Next, the operation will be described.
Condensate generated in the steam-using device 2 passes through the steam trap 3 and reaches the header 4 and is sucked into the ejector 5. A part of the condensate is circulated through the circulation path 6 by the circulation pump 7, and a part of the condensate is condensed. The steam is supplied to the boiler 1 through the recovery line 8 and the valve 9 and is again supplied to the steam-using device 2 as steam.
[0015]
The liquid temperature in the water supply tank 11 is detected by a temperature sensor 17 and maintained at a predetermined temperature, for example, 60 degrees C. by a temperature controller 18 and an automatic adjustment valve 15. Therefore, a large amount of re-evaporated vapor is not diffused from the upper part of the water supply tank 11, and the water supply pump 12 does not cause cavitation.
[0016]
The fluid controlled to a predetermined temperature in the water supply tank 11 is supplied to the header 4 from the pipeline 19, the injection pump 20, and the automatic valve 21, and the temperature in the header 4 is lowered to the predetermined temperature. When the temperature in the header 4 is lowered to a predetermined temperature, a temperature gradient, that is, a pressure gradient is created between the steam using device 2 and the header 4 and condensate generated in the steam using device 2 is retained. Without going through the steam trap 3, it flows down into the header 4.
[0017]
【The invention's effect】
The present invention has the following effects.
By maintaining the fluid temperature in the water supply tank at a predetermined value, it is possible to prevent the loss of thermal energy by preventing the dissipation of a large amount of reevaporated vapor from the water supply tank, and to prevent cavitation with the water supply pump. It does not occur.
[0018]
The required pressure gradient is created between the steam equipment and the steam trap and the condensate recovery pump by injecting the fluid of the water tank at the specified temperature into the condensate inflow side of the condensate recovery pump by the tank fluid injection means. The condensate generated in the steam-using device can be sucked smoothly through the steam trap by the condensate recovery pump, and the condensate does not stay in the steam-using device.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of a condensate recovery apparatus according to the present invention.
FIG. 2 is a configuration diagram of a conventional condensate recovery apparatus.
[Explanation of symbols]
1 Boiler
2 Steam equipment 3 Steam trap 4 Header
5 Ejector 6 Circulation path 7 Circulation pump 8 Condensate recovery line 11 Water supply tank 12 Water supply pump 16 Cooling water supply pipe 17 Temperature sensor
18 Temperature controller 20 Infusion pump

Claims (1)

蒸気使用機器で発生した復水を復水回収ポンプにより、ボイラ―あるいは給水タンク等の復水回収先へ圧送するものにおいて、給水タンクに冷却水を供給する冷却水供給管と、給水タンク内の液温を検出する温度検出手段を設けて、当該給水タンク内の液温を所定温度に維持すると共に、給水タンク内の流体を復水回収ポンプの復水流入側に注入するタンク流体注入手段を設けたことを特徴とする復水回収装置。Condensate generated from steam-using equipment is pumped by a condensate recovery pump to a condensate recovery destination such as a boiler or a water supply tank. A cooling water supply pipe for supplying cooling water to the water supply tank, There is provided a temperature detecting means for detecting the liquid temperature to maintain the liquid temperature in the water supply tank at a predetermined temperature, and tank fluid injection means for injecting the fluid in the water supply tank to the condensate inflow side of the condensate recovery pump. A condensate recovery apparatus characterized by being provided.
JP29194795A 1995-10-13 1995-10-13 Condensate recovery device Expired - Fee Related JP3725221B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29194795A JP3725221B2 (en) 1995-10-13 1995-10-13 Condensate recovery device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29194795A JP3725221B2 (en) 1995-10-13 1995-10-13 Condensate recovery device

Publications (2)

Publication Number Publication Date
JPH09112808A JPH09112808A (en) 1997-05-02
JP3725221B2 true JP3725221B2 (en) 2005-12-07

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004278870A (en) * 2003-03-14 2004-10-07 Tlv Co Ltd Condensate re-evaporation device
JP2010164236A (en) * 2009-01-15 2010-07-29 Tlv Co Ltd Condensate returning device
JP5367385B2 (en) * 2009-01-15 2013-12-11 株式会社テイエルブイ Condensate recovery device
JP2010164237A (en) * 2009-01-15 2010-07-29 Tlv Co Ltd Condensate returning device
JP5367384B2 (en) * 2009-01-15 2013-12-11 株式会社テイエルブイ Condensate recovery device
JP5230683B2 (en) * 2010-05-07 2013-07-10 株式会社サムソン High temperature drain recovery system
JP5187707B2 (en) * 2011-08-12 2013-04-24 株式会社ビクター特販 Heat recovery device and heat recovery system
CN103292313A (en) * 2013-05-30 2013-09-11 浙江莱美纺织印染科技有限公司 Closed condensate recycling system

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